release: v0.6.0

Expand the release notes and bump Cargo.toml.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

.github/workflows/build.yaml

@@ -0,0 +1,70 @@
+name: Cloud Hypervisor Actions
+on: [pull_request, create]
+
+jobs:
+  build:
+    if: github.event_name == 'pull_request'
+    name: Build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+          - beta
+          - nightly
+    steps:
+      - name: Code checkout
+        uses: actions/checkout@v2
+      - name: Install Rust toolchain (${{ matrix.rust }})
+        uses: actions-rs/toolchain@v1
+        with:
+            toolchain: ${{ matrix.rust }}
+            override: true
+
+      - name: Build
+        run: cargo build --release
+
+  release:
+    if: github.event_name == 'create' && github.event.ref_type == 'tag'
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Code checkout
+        uses: actions/checkout@v2
+      - name: Install Rust toolchain (stable)
+        uses: actions-rs/toolchain@v1
+        with:
+            toolchain: stable
+            override: true
+      - name: Build
+        run: cargo build --release
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          draft: true
+          prerelease: true
+      - name: Upload cloud-hypervisor
+        id: upload-release-cloud-hypervisor
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: target/release/cloud-hypervisor
+          asset_name: cloud-hypervisor
+          asset_content_type: application/octet-stream
+      - name: Upload ch-remote
+        id: upload-release-ch-remote
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: target/release/ch-remote
+          asset_name: ch-remote
+          asset_content_type: application/octet-stream

.rustfmt.toml

@@ -0,0 +1 @@
+edition = "2018"

.travis.yml

@@ -1,16 +0,0 @@
-language: rust
-
-rust:
-  - stable
-
-script:
-  - cargo build --release
-  
-deploy:
-  provider: releases
-  api_key: $GITHUB_OAUTH_TOKEN
-  file: target/release/cloud-hypervisor
-  skip_cleanup: true
-  draft: true
-  on:
-    tags: true

Cargo.toml

@@ -1,39 +1,39 @@
 [package]
 name = "cloud-hypervisor"
-version = "0.4.0"
+version = "0.6.0"
 authors = ["The Cloud Hypervisor Authors"]
 edition = "2018"
 default-run = "cloud-hypervisor"
+build = "build.rs"
 
 [dependencies]
-clap = "2.33.0"
+arc-swap = ">=0.4.4"
+clap = { version = "2.33.0", features=["wrap_help"] }
 epoll = ">=4.0.1"
+futures = { version = "0.3.4", features = ["thread-pool"] }
 lazy_static = "1.4.0"
-libc = "0.2.66"
+libc = "0.2.68"
 log = { version = "0.4.8", features = ["std"] }
-net_gen = { path = "net_gen" }
+serde_json = ">=1.0.9"
-net_util = { path = "net_util" }
-qcow = { path = "qcow" }
 vhost_user_backend = { path = "vhost_user_backend"}
+vhost_user_block = { path = "vhost_user_block"}
 vhost_user_fs = { path = "vhost_user_fs"}
+vhost_user_net = { path = "vhost_user_net"}
 virtio-bindings = "0.1.0"
 vmm = { path = "vmm" }
 vm-device = { path = "vm-device" }
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+vm-memory = "0.1.0"
-vmm-sys-util = ">=0.3.1"
+vmm-sys-util = "0.4.0"
 vm-virtio = { path = "vm-virtio" }
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", features = ["vhost-user-slave"] }
 
 [dev-dependencies]
-ssh2 = "0.6.0"
+ssh2 = "0.8.0"
 dirs = "2.0.2"
 credibility = "0.1.3"
 tempdir= "0.3.7"
 lazy_static= "1.4.0"
 
-[dependencies.vhost_rs]
-path = "vhost_rs"
-features = ["vhost-user-slave"]
-
 [features]
 default = ["acpi", "pci", "cmos"]
 acpi = ["vmm/acpi"]
@@ -46,5 +46,21 @@ integration_tests = []
 
 [workspace]
 members = [
+    "arch",
+    "devices",
+    "qcow",
+    "pci",
+    "vmm",
+    "vm-virtio",
+    "vm-device",
+    "vhost_user_block",
     "vhost_user_backend",
+    "vhost_user_fs",
+    "vhost_user_net",
+    "vfio",
+    "net_util",
+    "acpi_tables",
+    "arch_gen",
+    "net_gen",
+    "vm-allocator",
 ]

Jenkinsfile

@@ -1,7 +1,7 @@
 pipeline{
 	agent none
 	stages {
-		stage ('Master build') {
+		stage ('Early checks') {
 			agent { node { label 'master' } }
 			stages {
 				stage ('Check for RFC/WIP builds') {
@@ -14,54 +14,57 @@ pipeline{
 					}
 				}
 				stage ('Cancel older builds') {
+					when { not { branch 'master' } }
 					steps {
 						cancelPreviousBuilds()
 					}
 				}
 			}
 		}
-		stage ('Worker build') {
+		stage ('Build') {
-			agent { node { label 'bionic' } }
+			failFast true
-			options {
+            parallel {
-				timeout(time: 1, unit: 'HOURS')
+				stage ('Master build') {
-			}
+					agent { node { label 'master' } }
-			stages {
+					stages {
-				stage ('Checkout') {
+						stage ('Checkout') {
-					steps {
+							steps {
-						checkout scm
+								checkout scm
+							}
+						}
+						stage ('Run Cargo tests') {
+							steps {
+								sh "scripts/dev_cli.sh tests --cargo"
+							}
+						}
+						stage ('Run OpenAPI tests') {
+							steps {
+								sh "scripts/run_openapi_tests.sh"
+							}
+						}
 					}
-				}
+				}	
-				stage ('Install system packages') {
+				stage ('Worker build') {
-					steps {
+					agent { node { label 'bionic' } }
-						sh "sudo DEBIAN_FRONTEND=noninteractive apt-get install -yq build-essential mtools libssl-dev pkg-config"
+					options {
-							sh "sudo apt-get install -yq flex bison libelf-dev qemu-utils qemu-system libglib2.0-dev libpixman-1-dev libseccomp-dev libcap-ng-dev socat"
+						timeout(time: 1, unit: 'HOURS')
-							sh "sudo snap install docker"
 					}
-				}
+					stages {
-				stage ('Install Rust') {
+						stage ('Checkout') {
-					steps {
+							steps {
-						sh "nohup curl https://sh.rustup.rs -sSf | sh -s -- -y"
+								checkout scm
-					}
+							}
-				}
+						}
-				stage ('Run Cargo tests') {
+						stage ('Run unit tests') {
-					steps {
+							steps {
-						sh "scripts/run_cargo_tests.sh"
+								sh "scripts/dev_cli.sh tests --unit"
-					}
+							}
-				}
+						}
-				stage ('Run OpenAPI tests') {
+						stage ('Run integration tests') {
-					steps {
+							steps {
-						sh "scripts/run_openapi_tests.sh"
+								sh "scripts/dev_cli.sh tests --integration"
-					}
+							}
-				}
+						}
-				stage ('Run unit tests') {
-					steps {
-						sh "scripts/run_unit_tests.sh"
-					}
-				}
-				stage ('Run integration tests') {
-					steps {
-						sh "sudo mount -t tmpfs tmpfs /tmp"
-							sh "scripts/run_integration_tests.sh"
 					}
 				}
 			}
@@ -82,4 +85,4 @@ def cancelPreviousBuilds() {
 				build.doStop()
 			}
 		}
-}
+}

README.md

@@ -86,6 +86,34 @@ $ popd
 
 This will build a `cloud-hypervisor` binary under `$CLOUDH/cloud-hypervisor/target/release/cloud-hypervisor`.
 
+### Containerized builds and tests
+
+If you want to build and test Cloud Hypervisor without having to install all the
+required dependencies (The rust toolchain, cargo tools, etc), you can also use
+Cloud Hypervisor's development script: `dev_cli.sh`. Please note that upon its
+first invocation, this script will pull a fairly large container image.
+
+For example, to build the Cloud Hypervisor release binary:
+
+```shell
+$ pushd $CLOUDH
+$ cd cloud-hypervisor
+$ ./scripts/dev_cli.sh build --release
+```
+
+With `dev_cli.sh`, one can also run the Cloud Hypervisor CI locally. This can be
+very convenient for debugging CI errors without having to fully rely on the
+Cloud Hypervisor CI infrastructure.
+
+For example, to run the Cloud Hypervisor unit tests:
+
+```shell
+$ ./scripts/dev_cli.sh tests --unit
+```
+
+Run the `./scripts/dev_cli.sh --help` command to view all the supported
+development script commands and their related options.
+
 ## Run
 
 You can run a guest VM by either using an existing cloud image or booting into your own kernel and disk image.
@@ -129,18 +157,19 @@ Multiple arguments can be given to the `--disk` parameter.
 #### Building your kernel
 
 `cloud-hypervisor` also supports direct kernel boot into a `vmlinux` ELF kernel
-image. You want to build such an image first:
+image. In order to support virtio-fs and virtio-iommu we have our own development branch. You are of course able to use your own kernel but these instructions will continue with the version that we develop and test against.
+
+To build the kernel:
 
 ```shell
 
-# Clone a 5.0 Linux kernel
+# Clone the Cloud Hypervisor Linux branch
 $ pushd $CLOUDH
-$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git linux-cloud-hypervisor
+$ git clone --depth 1 https://github.com/cloud-hypervisor/linux.git -b virtio-fs-virtio-iommu-virtio-mem-5.6-rc4 linux-cloud-hypervisor
-$ cd linux-cloud-hypervisor
+$ pushd linux-cloud-hypervisor
-$ git reset --hard v5.0
 
 # Use the cloud-hypervisor kernel config to build your kernel
-$ cp $CLOUDH/cloud-hypervisor/resources/linux-5.0-config .config
+$ cp $CLOUDH/cloud-hypervisor/resources/linux-config .config
 $ make bzImage -j `nproc`
 $ popd
 ```

acpi_tables/Cargo.toml

@@ -5,5 +5,5 @@ authors = ["The Cloud Hypervisor Authors"]
 edition = "2018"
 
 [dependencies]
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+vm-memory = "0.1.0"
 

acpi_tables/src/aml.rs

@@ -3,6 +3,8 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+use std::marker::PhantomData;
+
 pub trait Aml {
     fn to_aml_bytes(&self) -> Vec<u8>;
 }
@@ -1158,6 +1160,46 @@ impl Aml for Buffer {
     }
 }
 
+pub struct CreateField<'a, T> {
+    buffer: &'a dyn Aml,
+    offset: &'a dyn Aml,
+    field: Path,
+    phantom: PhantomData<&'a T>,
+}
+
+impl<'a, T> CreateField<'a, T> {
+    pub fn new(buffer: &'a dyn Aml, offset: &'a dyn Aml, field: Path) -> Self {
+        CreateField::<T> {
+            buffer,
+            offset,
+            field,
+            phantom: PhantomData::default(),
+        }
+    }
+}
+
+impl<'a> Aml for CreateField<'a, u64> {
+    fn to_aml_bytes(&self) -> Vec<u8> {
+        let mut bytes = Vec::new();
+        bytes.push(0x8f); /* CreateQWordFieldOp */
+        bytes.extend_from_slice(&self.buffer.to_aml_bytes());
+        bytes.extend_from_slice(&self.offset.to_aml_bytes());
+        bytes.extend_from_slice(&self.field.to_aml_bytes());
+        bytes
+    }
+}
+
+impl<'a> Aml for CreateField<'a, u32> {
+    fn to_aml_bytes(&self) -> Vec<u8> {
+        let mut bytes = Vec::new();
+        bytes.push(0x8a); /* CreateDWordFieldOp */
+        bytes.extend_from_slice(&self.buffer.to_aml_bytes());
+        bytes.extend_from_slice(&self.offset.to_aml_bytes());
+        bytes.extend_from_slice(&self.field.to_aml_bytes());
+        bytes
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -1888,4 +1930,59 @@ mod tests {
             &buffer_data[..]
         )
     }
+
+    #[test]
+    fn test_create_field() {
+        /*
+        Method (MCRS, 0, Serialized)
+        {
+            Name (MR64, ResourceTemplate ()
+            {
+                QWordMemory (ResourceProducer, PosDecode, MinFixed, MaxFixed, Cacheable, ReadWrite,
+                    0x0000000000000000, // Granularity
+                    0x0000000000000000, // Range Minimum
+                    0xFFFFFFFFFFFFFFFE, // Range Maximum
+                    0x0000000000000000, // Translation Offset
+                    0xFFFFFFFFFFFFFFFF, // Length
+                    ,, _Y00, AddressRangeMemory, TypeStatic)
+            })
+            CreateQWordField (MR64, \_SB.MHPC.MCRS._Y00._MIN, MIN)  // _MIN: Minimum Base Address
+            CreateQWordField (MR64, \_SB.MHPC.MCRS._Y00._MAX, MAX)  // _MAX: Maximum Base Address
+            CreateQWordField (MR64, \_SB.MHPC.MCRS._Y00._LEN, LEN)  // _LEN: Length
+        }
+        */
+        let data = [
+            0x14, 0x41, 0x06, 0x4D, 0x43, 0x52, 0x53, 0x08, 0x08, 0x4D, 0x52, 0x36, 0x34, 0x11,
+            0x33, 0x0A, 0x30, 0x8A, 0x2B, 0x00, 0x00, 0x0C, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFE, 0xFF, 0xFF,
+            0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF,
+            0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x79, 0x00, 0x8F, 0x4D, 0x52, 0x36, 0x34,
+            0x0A, 0x0E, 0x4D, 0x49, 0x4E, 0x5F, 0x8F, 0x4D, 0x52, 0x36, 0x34, 0x0A, 0x16, 0x4D,
+            0x41, 0x58, 0x5F, 0x8F, 0x4D, 0x52, 0x36, 0x34, 0x0A, 0x26, 0x4C, 0x45, 0x4E, 0x5F,
+        ];
+
+        assert_eq!(
+            Method::new(
+                "MCRS".into(),
+                0,
+                true,
+                vec![
+                    &Name::new(
+                        "MR64".into(),
+                        &ResourceTemplate::new(vec![&AddressSpace::new_memory(
+                            AddressSpaceCachable::Cacheable,
+                            true,
+                            0x0000_0000_0000_0000u64,
+                            0xFFFF_FFFF_FFFF_FFFEu64
+                        )])
+                    ),
+                    &CreateField::<u64>::new(&Path::new("MR64"), &14usize, "MIN_".into()),
+                    &CreateField::<u64>::new(&Path::new("MR64"), &22usize, "MAX_".into()),
+                    &CreateField::<u64>::new(&Path::new("MR64"), &38usize, "LEN_".into()),
+                ]
+            )
+            .to_aml_bytes(),
+            &data[..]
+        );
+    }
 }

arch/Cargo.toml

@@ -7,21 +7,18 @@ authors = ["The Chromium OS Authors"]
 default = []
 
 [dependencies]
-byteorder = "1.3.2"
+byteorder = "1.3.4"
 kvm-bindings = "0.2.0"
-kvm-ioctls = "0.4.0"
+kvm-ioctls = "0.5.0"
-libc = "0.2.60"
+libc = "0.2.68"
+vm-memory = { version = "0.1.0", features = ["backend-mmap"] }
 
 acpi_tables = { path = "../acpi_tables", optional = true }
 arch_gen = { path = "../arch_gen" }
 
-[dependencies.vm-memory]
-git = "https://github.com/rust-vmm/vm-memory"
-features = ["backend-mmap"]
-
 [dependencies.linux-loader]
 git = "https://github.com/rust-vmm/linux-loader"
 features = ["elf", "bzimage"]
 
 [dev-dependencies]
-rand = "0.7.0"
+rand = "0.7.3"

arch/src/lib.rs

@@ -1,3 +1,5 @@
+// Copyright © 2020, Oracle and/or its affiliates.
+//
 // Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 
@@ -22,7 +24,7 @@ extern crate vm_memory;
 
 use std::result;
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug)]
 pub enum Error {
     #[cfg(target_arch = "x86_64")]
     /// X86_64 specific error triggered during system configuration.
@@ -30,7 +32,15 @@ pub enum Error {
     /// The zero page extends past the end of guest_mem.
     ZeroPagePastRamEnd,
     /// Error writing the zero page of guest memory.
-    ZeroPageSetup,
+    ZeroPageSetup(vm_memory::GuestMemoryError),
+    /// The memory map table extends past the end of guest memory.
+    MemmapTablePastRamEnd,
+    /// Error writing memory map table to guest memory.
+    MemmapTableSetup,
+    /// The hvm_start_info structure extends past the end of guest memory.
+    StartInfoPastRamEnd,
+    /// Error writing hvm_start_info to guest memory.
+    StartInfoSetup,
 }
 pub type Result<T> = result::Result<T, Error>;
 
@@ -67,4 +77,5 @@ pub mod x86_64;
 #[cfg(target_arch = "x86_64")]
 pub use x86_64::{
     arch_memory_regions, configure_system, layout, layout::CMDLINE_MAX_SIZE, layout::CMDLINE_START,
+    BootProtocol, EntryPoint,
 };

arch/src/x86_64/gdt.rs

@@ -1,3 +1,5 @@
+// Copyright © 2020, Oracle and/or its affiliates.
+//
 // Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -11,21 +13,47 @@ use kvm_bindings::kvm_segment;
 
 /// Constructor for a conventional segment GDT (or LDT) entry. Derived from the kernel's segment.h.
 pub fn gdt_entry(flags: u16, base: u32, limit: u32) -> u64 {
-    ((((base as u64) & 0xff000000u64) << (56 - 24))
+    (((base as u64) & 0xff000000u64) << (56 - 24))
         | (((flags as u64) & 0x0000f0ffu64) << 40)
         | (((limit as u64) & 0x000f0000u64) << (48 - 16))
         | (((base as u64) & 0x00ffffffu64) << 16)
-        | ((limit as u64) & 0x0000ffffu64))
+        | ((limit as u64) & 0x0000ffffu64)
 }
 
 fn get_base(entry: u64) -> u64 {
-    ((((entry) & 0xFF00000000000000) >> 32)
+    (((entry) & 0xFF00000000000000) >> 32)
         | (((entry) & 0x000000FF00000000) >> 16)
-        | (((entry) & 0x00000000FFFF0000) >> 16))
+        | (((entry) & 0x00000000FFFF0000) >> 16)
 }
 
+// Extract the segment limit from the GDT segment descriptor.
+//
+// In a segment descriptor, the limit field is 20 bits, so it can directly describe
+// a range from 0 to 0xFFFFF (1MByte). When G flag is set (4-KByte page granularity) it
+// scales the value in the limit field by a factor of 2^12 (4Kbytes), making the effective
+// limit range from 0xFFF (4 KBytes) to 0xFFFF_FFFF (4 GBytes).
+//
+// However, the limit field in the VMCS definition is a 32 bit field, and the limit value is not
+// automatically scaled using the G flag. This means that for a desired range of 4GB for a
+// given segment, its limit must be specified as 0xFFFF_FFFF. Therefore the method of obtaining
+// the limit from the GDT entry is not sufficient, since it only provides 20 bits when 32 bits
+// are necessary. Fortunately, we can check if the G flag is set when extracting the limit since
+// the full GDT entry is passed as an argument, and perform the scaling of the limit value to
+// return the full 32 bit value.
+//
+// The scaling mentioned above is required when using PVH boot, since the guest boots in protected
+// (32-bit) mode and must be able to access the entire 32-bit address space. It does not cause issues
+// for the case of direct boot to 64-bit (long) mode, since in 64-bit mode the processor does not
+// perform runtime limit checking on code or data segments.
 fn get_limit(entry: u64) -> u32 {
-    ((((entry) & 0x000F000000000000) >> 32) | ((entry) & 0x000000000000FFFF)) as u32
+    let limit: u32 =
+        ((((entry) & 0x000F000000000000) >> 32) | ((entry) & 0x000000000000FFFF)) as u32;
+
+    // Perform manual limit scaling if G flag is set
+    match get_g(entry) {
+        0 => limit,
+        _ => ((limit << 12) | 0xFFF), // G flag is either 0 or 1
+    }
 }
 
 fn get_g(entry: u64) -> u8 {
@@ -109,7 +137,7 @@ mod tests {
         assert_eq!(0xB, seg.type_);
         // base and limit
         assert_eq!(0x100000, seg.base);
-        assert_eq!(0xfffff, seg.limit);
+        assert_eq!(0xffffffff, seg.limit);
         assert_eq!(0x0, seg.unusable);
     }
 }

arch/src/x86_64/interrupts.rs

@@ -55,7 +55,7 @@ fn set_klapic_reg(klapic: &mut kvm_lapic_state, reg_offset: usize, value: u32) {
 }
 
 fn set_apic_delivery_mode(reg: u32, mode: u32) -> u32 {
-    (((reg) & !0x700) | ((mode) << 8))
+    ((reg) & !0x700) | ((mode) << 8)
 }
 
 /// Configures LAPICs.  LAPIC0 is set for external interrupts, LAPIC1 is set for NMI.

arch/src/x86_64/layout.rs

@@ -1,3 +1,5 @@
+// Copyright © 2020, Oracle and/or its affiliates.
+//
 // Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -26,6 +28,13 @@ pub const LOW_RAM_START: GuestAddress = GuestAddress(0x0);
 pub const BOOT_GDT_START: GuestAddress = GuestAddress(0x500);
 pub const BOOT_IDT_START: GuestAddress = GuestAddress(0x520);
 
+/// Address for the hvm_start_info struct used in PVH boot
+pub const PVH_INFO_START: GuestAddress = GuestAddress(0x6000);
+
+/// Address of memory map table used in PVH boot. Can overlap
+/// with the zero page address since they are mutually exclusive.
+pub const MEMMAP_START: GuestAddress = GuestAddress(0x7000);
+
 /// The 'zero page', a.k.a linux kernel bootparams.
 pub const ZERO_PAGE_START: GuestAddress = GuestAddress(0x7000);
 

arch/src/x86_64/mod.rs

@@ -1,3 +1,5 @@
+// Copyright © 2020, Oracle and/or its affiliates.
+//
 // Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -13,14 +15,57 @@ pub mod regs;
 
 use crate::RegionType;
 use linux_loader::loader::bootparam::{boot_params, setup_header};
+use linux_loader::loader::start_info::{hvm_memmap_table_entry, hvm_start_info};
 use std::mem;
 use vm_memory::{
     Address, ByteValued, Bytes, GuestAddress, GuestMemory, GuestMemoryMmap, GuestUsize,
 };
 
+#[derive(Debug, Copy, Clone)]
+pub enum BootProtocol {
+    LinuxBoot,
+    PvhBoot,
+}
+
+impl ::std::fmt::Display for BootProtocol {
+    fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
+        match self {
+            BootProtocol::LinuxBoot => write!(f, "Linux 64-bit boot protocol"),
+            BootProtocol::PvhBoot => write!(f, "PVH boot protocol"),
+        }
+    }
+}
+
+#[derive(Debug, Copy, Clone)]
+/// Specifies the entry point address where the guest must start
+/// executing code, as well as which of the supported boot protocols
+/// is to be used to configure the guest initial state.
+pub struct EntryPoint {
+    /// Address in guest memory where the guest must start execution
+    pub entry_addr: GuestAddress,
+    /// Specifies which boot protocol to use
+    pub protocol: BootProtocol,
+}
+
 const E820_RAM: u32 = 1;
 const E820_RESERVED: u32 = 2;
 
+// This is a workaround to the Rust enforcement specifying that any implementation of a foreign
+// trait (in this case `DataInit`) where:
+// *    the type that is implementing the trait is foreign or
+// *    all of the parameters being passed to the trait (if there are any) are also foreign
+// is prohibited.
+#[derive(Copy, Clone, Default)]
+struct StartInfoWrapper(hvm_start_info);
+
+// It is safe to initialize StartInfoWrapper which is a wrapper over `hvm_start_info` (a series of ints).
+unsafe impl ByteValued for StartInfoWrapper {}
+
+#[derive(Copy, Clone, Default)]
+struct MemmapTableEntryWrapper(hvm_memmap_table_entry);
+
+unsafe impl ByteValued for MemmapTableEntryWrapper {}
+
 // This is a workaround to the Rust enforcement specifying that any implementation of a foreign
 // trait (in this case `DataInit`) where:
 // *    the type that is implementing the trait is foreign or
@@ -32,7 +77,7 @@ struct BootParamsWrapper(boot_params);
 // It is safe to initialize BootParamsWrap which is a wrapper over `boot_params` (a series of ints).
 unsafe impl ByteValued for BootParamsWrapper {}
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug)]
 pub enum Error {
     /// Invalid e820 setup params.
     E820Configuration,
@@ -109,33 +154,174 @@ pub fn configure_system(
     num_cpus: u8,
     setup_hdr: Option<setup_header>,
     rsdp_addr: Option<GuestAddress>,
+    boot_prot: BootProtocol,
+) -> super::Result<()> {
+    // Note that this puts the mptable at the last 1k of Linux's 640k base RAM
+    mptable::setup_mptable(guest_mem, num_cpus).map_err(Error::MpTableSetup)?;
+
+    match boot_prot {
+        BootProtocol::PvhBoot => {
+            configure_pvh(guest_mem, cmdline_addr, rsdp_addr)?;
+        }
+        BootProtocol::LinuxBoot => {
+            configure_64bit_boot(guest_mem, cmdline_addr, cmdline_size, setup_hdr, rsdp_addr)?;
+        }
+    }
+
+    Ok(())
+}
+
+fn configure_pvh(
+    guest_mem: &GuestMemoryMmap,
+    cmdline_addr: GuestAddress,
+    rsdp_addr: Option<GuestAddress>,
+) -> super::Result<()> {
+    const XEN_HVM_START_MAGIC_VALUE: u32 = 0x336ec578;
+
+    let mut start_info: StartInfoWrapper = StartInfoWrapper(hvm_start_info::default());
+
+    start_info.0.magic = XEN_HVM_START_MAGIC_VALUE;
+    start_info.0.version = 1; // pvh has version 1
+    start_info.0.nr_modules = 0;
+    start_info.0.cmdline_paddr = cmdline_addr.raw_value() as u64;
+    start_info.0.memmap_paddr = layout::MEMMAP_START.raw_value();
+
+    if let Some(rsdp_addr) = rsdp_addr {
+        start_info.0.rsdp_paddr = rsdp_addr.0;
+    }
+
+    // Vector to hold the memory maps which needs to be written to guest memory
+    // at MEMMAP_START after all of the mappings are recorded.
+    let mut memmap: Vec<hvm_memmap_table_entry> = Vec::new();
+
+    // Create the memory map entries.
+    add_memmap_entry(&mut memmap, 0, layout::EBDA_START.raw_value(), E820_RAM)?;
+
+    let mem_end = guest_mem.last_addr();
+
+    if mem_end < layout::MEM_32BIT_RESERVED_START {
+        add_memmap_entry(
+            &mut memmap,
+            layout::HIGH_RAM_START.raw_value(),
+            mem_end.unchecked_offset_from(layout::HIGH_RAM_START) + 1,
+            E820_RAM,
+        )?;
+    } else {
+        add_memmap_entry(
+            &mut memmap,
+            layout::HIGH_RAM_START.raw_value(),
+            layout::MEM_32BIT_RESERVED_START.unchecked_offset_from(layout::HIGH_RAM_START),
+            E820_RAM,
+        )?;
+        if mem_end > layout::RAM_64BIT_START {
+            add_memmap_entry(
+                &mut memmap,
+                layout::RAM_64BIT_START.raw_value(),
+                mem_end.unchecked_offset_from(layout::RAM_64BIT_START) + 1,
+                E820_RAM,
+            )?;
+        }
+    }
+
+    add_memmap_entry(
+        &mut memmap,
+        layout::PCI_MMCONFIG_START.0,
+        layout::PCI_MMCONFIG_SIZE,
+        E820_RESERVED,
+    )?;
+
+    start_info.0.memmap_entries = memmap.len() as u32;
+
+    // Copy the vector with the memmap table to the MEMMAP_START address
+    // which is already saved in the memmap_paddr field of hvm_start_info struct.
+    let mut memmap_start_addr = layout::MEMMAP_START;
+
+    guest_mem
+        .checked_offset(
+            memmap_start_addr,
+            mem::size_of::<hvm_memmap_table_entry>() * start_info.0.memmap_entries as usize,
+        )
+        .ok_or(super::Error::MemmapTablePastRamEnd)?;
+
+    // For every entry in the memmap vector, create a MemmapTableEntryWrapper
+    // and write it to guest memory.
+    for memmap_entry in memmap {
+        let map_entry_wrapper: MemmapTableEntryWrapper = MemmapTableEntryWrapper(memmap_entry);
+
+        guest_mem
+            .write_obj(map_entry_wrapper, memmap_start_addr)
+            .map_err(|_| super::Error::MemmapTableSetup)?;
+        memmap_start_addr =
+            memmap_start_addr.unchecked_add(mem::size_of::<hvm_memmap_table_entry>() as u64);
+    }
+
+    // The hvm_start_info struct itself must be stored at PVH_START_INFO
+    // address, and %rbx will be initialized to contain PVH_INFO_START prior to
+    // starting the guest, as required by the PVH ABI.
+    let start_info_addr = layout::PVH_INFO_START;
+
+    guest_mem
+        .checked_offset(start_info_addr, mem::size_of::<hvm_start_info>())
+        .ok_or(super::Error::StartInfoPastRamEnd)?;
+
+    // Write the start_info struct to guest memory.
+    guest_mem
+        .write_obj(start_info, start_info_addr)
+        .map_err(|_| super::Error::StartInfoSetup)?;
+
+    Ok(())
+}
+
+fn add_memmap_entry(
+    memmap: &mut Vec<hvm_memmap_table_entry>,
+    addr: u64,
+    size: u64,
+    mem_type: u32,
+) -> Result<(), Error> {
+    // Add the table entry to the vector
+    memmap.push(hvm_memmap_table_entry {
+        addr,
+        size,
+        type_: mem_type,
+        reserved: 0,
+    });
+
+    Ok(())
+}
+
+fn configure_64bit_boot(
+    guest_mem: &GuestMemoryMmap,
+    cmdline_addr: GuestAddress,
+    cmdline_size: usize,
+    setup_hdr: Option<setup_header>,
+    rsdp_addr: Option<GuestAddress>,
 ) -> super::Result<()> {
     const KERNEL_BOOT_FLAG_MAGIC: u16 = 0xaa55;
     const KERNEL_HDR_MAGIC: u32 = 0x53726448;
     const KERNEL_LOADER_OTHER: u8 = 0xff;
     const KERNEL_MIN_ALIGNMENT_BYTES: u32 = 0x1000000; // Must be non-zero.
 
-    // Note that this puts the mptable at the last 1k of Linux's 640k base RAM
-    mptable::setup_mptable(guest_mem, num_cpus).map_err(Error::MpTableSetup)?;
-
     let mut params: BootParamsWrapper = BootParamsWrapper(boot_params::default());
 
     if let Some(hdr) = setup_hdr {
+        // We should use the header if the loader provides one (e.g. from a bzImage).
         params.0.hdr = hdr;
-        params.0.hdr.cmd_line_ptr = cmdline_addr.raw_value() as u32;
-        params.0.hdr.cmdline_size = cmdline_size as u32;
     } else {
-        params.0.hdr.type_of_loader = KERNEL_LOADER_OTHER;
         params.0.hdr.boot_flag = KERNEL_BOOT_FLAG_MAGIC;
         params.0.hdr.header = KERNEL_HDR_MAGIC;
-        params.0.hdr.cmd_line_ptr = cmdline_addr.raw_value() as u32;
-        params.0.hdr.cmdline_size = cmdline_size as u32;
         params.0.hdr.kernel_alignment = KERNEL_MIN_ALIGNMENT_BYTES;
     };
 
+    // Common bootparams settings
+    if params.0.hdr.type_of_loader == 0 {
+        params.0.hdr.type_of_loader = KERNEL_LOADER_OTHER;
+    }
+    params.0.hdr.cmd_line_ptr = cmdline_addr.raw_value() as u32;
+    params.0.hdr.cmdline_size = cmdline_size as u32;
+
     add_e820_entry(&mut params.0, 0, layout::EBDA_START.raw_value(), E820_RAM)?;
 
-    let mem_end = guest_mem.end_addr();
+    let mem_end = guest_mem.last_addr();
     if mem_end < layout::MEM_32BIT_RESERVED_START {
         add_e820_entry(
             &mut params.0,
@@ -177,7 +363,7 @@ pub fn configure_system(
         .ok_or(super::Error::ZeroPagePastRamEnd)?;
     guest_mem
         .write_obj(params, zero_page_addr)
-        .map_err(|_| super::Error::ZeroPageSetup)?;
+        .map_err(super::Error::ZeroPageSetup)?;
 
     Ok(())
 }
@@ -226,15 +412,17 @@ mod tests {
     #[test]
     fn test_system_configuration() {
         let no_vcpus = 4;
-        let gm = GuestMemoryMmap::new(&vec![(GuestAddress(0), 0x10000)]).unwrap();
+        let gm = GuestMemoryMmap::from_ranges(&vec![(GuestAddress(0), 0x10000)]).unwrap();
-        let config_err = configure_system(&gm, GuestAddress(0), 0, 1, None, None);
+        let config_err = configure_system(
-        assert!(config_err.is_err());
+            &gm,
-        assert_eq!(
+            GuestAddress(0),
-            config_err.unwrap_err(),
+            0,
-            super::super::Error::X86_64Setup(super::Error::MpTableSetup(
+            1,
-                mptable::Error::NotEnoughMemory
+            None,
-            ))
+            None,
+            BootProtocol::LinuxBoot,
         );
+        assert!(config_err.is_err());
 
         // Now assigning some memory that falls before the 32bit memory hole.
         let mem_size = 128 << 20;
@@ -244,8 +432,28 @@ mod tests {
             .filter(|r| r.2 == RegionType::Ram)
             .map(|r| (r.0, r.1))
             .collect();
-        let gm = GuestMemoryMmap::new(&ram_regions).unwrap();
+        let gm = GuestMemoryMmap::from_ranges(&ram_regions).unwrap();
-        configure_system(&gm, GuestAddress(0), 0, no_vcpus, None, None).unwrap();
+        configure_system(
+            &gm,
+            GuestAddress(0),
+            0,
+            no_vcpus,
+            None,
+            None,
+            BootProtocol::LinuxBoot,
+        )
+        .unwrap();
+
+        configure_system(
+            &gm,
+            GuestAddress(0),
+            0,
+            no_vcpus,
+            None,
+            None,
+            BootProtocol::PvhBoot,
+        )
+        .unwrap();
 
         // Now assigning some memory that is equal to the start of the 32bit memory hole.
         let mem_size = 3328 << 20;
@@ -255,8 +463,28 @@ mod tests {
             .filter(|r| r.2 == RegionType::Ram)
             .map(|r| (r.0, r.1))
             .collect();
-        let gm = GuestMemoryMmap::new(&ram_regions).unwrap();
+        let gm = GuestMemoryMmap::from_ranges(&ram_regions).unwrap();
-        configure_system(&gm, GuestAddress(0), 0, no_vcpus, None, None).unwrap();
+        configure_system(
+            &gm,
+            GuestAddress(0),
+            0,
+            no_vcpus,
+            None,
+            None,
+            BootProtocol::LinuxBoot,
+        )
+        .unwrap();
+
+        configure_system(
+            &gm,
+            GuestAddress(0),
+            0,
+            no_vcpus,
+            None,
+            None,
+            BootProtocol::PvhBoot,
+        )
+        .unwrap();
 
         // Now assigning some memory that falls after the 32bit memory hole.
         let mem_size = 3330 << 20;
@@ -266,8 +494,28 @@ mod tests {
             .filter(|r| r.2 == RegionType::Ram)
             .map(|r| (r.0, r.1))
             .collect();
-        let gm = GuestMemoryMmap::new(&ram_regions).unwrap();
+        let gm = GuestMemoryMmap::from_ranges(&ram_regions).unwrap();
-        configure_system(&gm, GuestAddress(0), 0, no_vcpus, None, None).unwrap();
+        configure_system(
+            &gm,
+            GuestAddress(0),
+            0,
+            no_vcpus,
+            None,
+            None,
+            BootProtocol::LinuxBoot,
+        )
+        .unwrap();
+
+        configure_system(
+            &gm,
+            GuestAddress(0),
+            0,
+            no_vcpus,
+            None,
+            None,
+            BootProtocol::PvhBoot,
+        )
+        .unwrap();
     }
 
     #[test]
@@ -309,4 +557,29 @@ mod tests {
         )
         .is_err());
     }
+
+    #[test]
+    fn test_add_memmap_entry() {
+        let mut memmap: Vec<hvm_memmap_table_entry> = Vec::new();
+
+        let expected_memmap = vec![
+            hvm_memmap_table_entry {
+                addr: 0x0,
+                size: 0x1000,
+                type_: E820_RAM,
+                ..Default::default()
+            },
+            hvm_memmap_table_entry {
+                addr: 0x10000,
+                size: 0xa000,
+                type_: E820_RESERVED,
+                ..Default::default()
+            },
+        ];
+
+        add_memmap_entry(&mut memmap, 0, 0x1000, E820_RAM).unwrap();
+        add_memmap_entry(&mut memmap, 0x10000, 0xa000, E820_RESERVED).unwrap();
+
+        assert_eq!(format!("{:?}", memmap), format!("{:?}", expected_memmap));
+    }
 }

arch/src/x86_64/mptable.rs

@@ -14,7 +14,7 @@ use libc::c_char;
 
 use arch_gen::x86::mpspec;
 use layout::{APIC_START, IOAPIC_START, MPTABLE_START};
-use vm_memory::{Address, ByteValued, Bytes, GuestMemory, GuestMemoryMmap};
+use vm_memory::{Address, ByteValued, Bytes, GuestMemory, GuestMemoryError, GuestMemoryMmap};
 
 // This is a workaround to the Rust enforcement specifying that any implementation of a foreign
 // trait (in this case `ByteValued`) where:
@@ -45,30 +45,30 @@ unsafe impl ByteValued for MpcTableWrapper {}
 unsafe impl ByteValued for MpcLintsrcWrapper {}
 unsafe impl ByteValued for MpfIntelWrapper {}
 
-#[derive(Debug, PartialEq)]
+#[derive(Debug)]
 pub enum Error {
     /// There was too little guest memory to store the entire MP table.
     NotEnoughMemory,
     /// The MP table has too little address space to be stored.
     AddressOverflow,
     /// Failure while zeroing out the memory for the MP table.
-    Clear,
+    Clear(GuestMemoryError),
     /// Number of CPUs exceeds the maximum supported CPUs
     TooManyCpus,
     /// Failure to write the MP floating pointer.
-    WriteMpfIntel,
+    WriteMpfIntel(GuestMemoryError),
     /// Failure to write MP CPU entry.
-    WriteMpcCpu,
+    WriteMpcCpu(GuestMemoryError),
     /// Failure to write MP ioapic entry.
-    WriteMpcIoapic,
+    WriteMpcIoapic(GuestMemoryError),
     /// Failure to write MP bus entry.
-    WriteMpcBus,
+    WriteMpcBus(GuestMemoryError),
     /// Failure to write MP interrupt source entry.
-    WriteMpcIntsrc,
+    WriteMpcIntsrc(GuestMemoryError),
     /// Failure to write MP local interrupt source entry.
-    WriteMpcLintsrc,
+    WriteMpcLintsrc(GuestMemoryError),
     /// Failure to write MP table header.
-    WriteMpcTable,
+    WriteMpcTable(GuestMemoryError),
 }
 
 pub type Result<T> = result::Result<T, Error>;
@@ -145,7 +145,7 @@ pub fn setup_mptable(mem: &GuestMemoryMmap, num_cpus: u8) -> Result<()> {
     }
 
     mem.read_exact_from(base_mp, &mut io::repeat(0), mp_size)
-        .map_err(|_| Error::Clear)?;
+        .map_err(Error::Clear)?;
 
     {
         let mut mpf_intel = MpfIntelWrapper(mpspec::mpf_intel::default());
@@ -156,7 +156,7 @@ pub fn setup_mptable(mem: &GuestMemoryMmap, num_cpus: u8) -> Result<()> {
         mpf_intel.0.physptr = (base_mp.raw_value() + size) as u32;
         mpf_intel.0.checksum = mpf_intel_compute_checksum(&mpf_intel.0);
         mem.write_obj(mpf_intel, base_mp)
-            .map_err(|_| Error::WriteMpfIntel)?;
+            .map_err(Error::WriteMpfIntel)?;
         base_mp = base_mp.unchecked_add(size);
     }
 
@@ -181,7 +181,7 @@ pub fn setup_mptable(mem: &GuestMemoryMmap, num_cpus: u8) -> Result<()> {
             mpc_cpu.0.cpufeature = CPU_STEPPING;
             mpc_cpu.0.featureflag = CPU_FEATURE_APIC | CPU_FEATURE_FPU;
             mem.write_obj(mpc_cpu, base_mp)
-                .map_err(|_| Error::WriteMpcCpu)?;
+                .map_err(Error::WriteMpcCpu)?;
             base_mp = base_mp.unchecked_add(size as u64);
             checksum = checksum.wrapping_add(compute_checksum(&mpc_cpu.0));
         }
@@ -193,7 +193,7 @@ pub fn setup_mptable(mem: &GuestMemoryMmap, num_cpus: u8) -> Result<()> {
         mpc_bus.0.busid = 0;
         mpc_bus.0.bustype = BUS_TYPE_ISA;
         mem.write_obj(mpc_bus, base_mp)
-            .map_err(|_| Error::WriteMpcBus)?;
+            .map_err(Error::WriteMpcBus)?;
         base_mp = base_mp.unchecked_add(size as u64);
         checksum = checksum.wrapping_add(compute_checksum(&mpc_bus.0));
     }
@@ -206,7 +206,7 @@ pub fn setup_mptable(mem: &GuestMemoryMmap, num_cpus: u8) -> Result<()> {
         mpc_ioapic.0.flags = mpspec::MPC_APIC_USABLE as u8;
         mpc_ioapic.0.apicaddr = IOAPIC_START.0 as u32;
         mem.write_obj(mpc_ioapic, base_mp)
-            .map_err(|_| Error::WriteMpcIoapic)?;
+            .map_err(Error::WriteMpcIoapic)?;
         base_mp = base_mp.unchecked_add(size as u64);
         checksum = checksum.wrapping_add(compute_checksum(&mpc_ioapic.0));
     }
@@ -222,7 +222,7 @@ pub fn setup_mptable(mem: &GuestMemoryMmap, num_cpus: u8) -> Result<()> {
         mpc_intsrc.0.dstapic = ioapicid;
         mpc_intsrc.0.dstirq = i;
         mem.write_obj(mpc_intsrc, base_mp)
-            .map_err(|_| Error::WriteMpcIntsrc)?;
+            .map_err(Error::WriteMpcIntsrc)?;
         base_mp = base_mp.unchecked_add(size as u64);
         checksum = checksum.wrapping_add(compute_checksum(&mpc_intsrc.0));
     }
@@ -237,7 +237,7 @@ pub fn setup_mptable(mem: &GuestMemoryMmap, num_cpus: u8) -> Result<()> {
         mpc_lintsrc.0.destapic = 0;
         mpc_lintsrc.0.destapiclint = 0;
         mem.write_obj(mpc_lintsrc, base_mp)
-            .map_err(|_| Error::WriteMpcLintsrc)?;
+            .map_err(Error::WriteMpcLintsrc)?;
         base_mp = base_mp.unchecked_add(size as u64);
         checksum = checksum.wrapping_add(compute_checksum(&mpc_lintsrc.0));
     }
@@ -252,7 +252,7 @@ pub fn setup_mptable(mem: &GuestMemoryMmap, num_cpus: u8) -> Result<()> {
         mpc_lintsrc.0.destapic = 0xFF; /* to all local APICs */
         mpc_lintsrc.0.destapiclint = 1;
         mem.write_obj(mpc_lintsrc, base_mp)
-            .map_err(|_| Error::WriteMpcLintsrc)?;
+            .map_err(Error::WriteMpcLintsrc)?;
         base_mp = base_mp.unchecked_add(size as u64);
         checksum = checksum.wrapping_add(compute_checksum(&mpc_lintsrc.0));
     }
@@ -271,7 +271,7 @@ pub fn setup_mptable(mem: &GuestMemoryMmap, num_cpus: u8) -> Result<()> {
         checksum = checksum.wrapping_add(compute_checksum(&mpc_table.0));
         mpc_table.0.checksum = (!checksum).wrapping_add(1) as i8;
         mem.write_obj(mpc_table, table_base)
-            .map_err(|_| Error::WriteMpcTable)?;
+            .map_err(Error::WriteMpcTable)?;
     }
 
     Ok(())
@@ -296,7 +296,8 @@ mod tests {
     #[test]
     fn bounds_check() {
         let num_cpus = 4;
-        let mem = GuestMemoryMmap::new(&[(MPTABLE_START, compute_mp_size(num_cpus))]).unwrap();
+        let mem =
+            GuestMemoryMmap::from_ranges(&[(MPTABLE_START, compute_mp_size(num_cpus))]).unwrap();
 
         setup_mptable(&mem, num_cpus).unwrap();
     }
@@ -304,7 +305,8 @@ mod tests {
     #[test]
     fn bounds_check_fails() {
         let num_cpus = 4;
-        let mem = GuestMemoryMmap::new(&[(MPTABLE_START, compute_mp_size(num_cpus) - 1)]).unwrap();
+        let mem = GuestMemoryMmap::from_ranges(&[(MPTABLE_START, compute_mp_size(num_cpus) - 1)])
+            .unwrap();
 
         assert!(setup_mptable(&mem, num_cpus).is_err());
     }
@@ -312,7 +314,8 @@ mod tests {
     #[test]
     fn mpf_intel_checksum() {
         let num_cpus = 1;
-        let mem = GuestMemoryMmap::new(&[(MPTABLE_START, compute_mp_size(num_cpus))]).unwrap();
+        let mem =
+            GuestMemoryMmap::from_ranges(&[(MPTABLE_START, compute_mp_size(num_cpus))]).unwrap();
 
         setup_mptable(&mem, num_cpus).unwrap();
 
@@ -327,7 +330,8 @@ mod tests {
     #[test]
     fn mpc_table_checksum() {
         let num_cpus = 4;
-        let mem = GuestMemoryMmap::new(&[(MPTABLE_START, compute_mp_size(num_cpus))]).unwrap();
+        let mem =
+            GuestMemoryMmap::from_ranges(&[(MPTABLE_START, compute_mp_size(num_cpus))]).unwrap();
 
         setup_mptable(&mem, num_cpus).unwrap();
 
@@ -356,9 +360,11 @@ mod tests {
 
     #[test]
     fn cpu_entry_count() {
-        let mem =
+        let mem = GuestMemoryMmap::from_ranges(&[(
-            GuestMemoryMmap::new(&[(MPTABLE_START, compute_mp_size(MAX_SUPPORTED_CPUS as u8))])
+            MPTABLE_START,
-                .unwrap();
+            compute_mp_size(MAX_SUPPORTED_CPUS as u8),
+        )])
+        .unwrap();
 
         for i in 0..MAX_SUPPORTED_CPUS as u8 {
             setup_mptable(&mem, i).unwrap();
@@ -391,9 +397,10 @@ mod tests {
     #[test]
     fn cpu_entry_count_max() {
         let cpus = MAX_SUPPORTED_CPUS + 1;
-        let mem = GuestMemoryMmap::new(&[(MPTABLE_START, compute_mp_size(cpus as u8))]).unwrap();
+        let mem =
+            GuestMemoryMmap::from_ranges(&[(MPTABLE_START, compute_mp_size(cpus as u8))]).unwrap();
 
-        let result = setup_mptable(&mem, cpus as u8).unwrap_err();
+        let result = setup_mptable(&mem, cpus as u8);
-        assert_eq!(result, Error::TooManyCpus);
+        assert!(result.is_err());
     }
 }

arch/src/x86_64/regs.rs

@@ -1,3 +1,5 @@
+// Copyright © 2020, Oracle and/or its affiliates.
+//
 // Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -8,11 +10,12 @@
 use std::{mem, result};
 
 use super::gdt::{gdt_entry, kvm_segment_from_gdt};
+use super::BootProtocol;
 use arch_gen::x86::msr_index;
 use kvm_bindings::{kvm_fpu, kvm_msr_entry, kvm_regs, kvm_sregs, Msrs};
 use kvm_ioctls::VcpuFd;
-use layout::{BOOT_GDT_START, BOOT_IDT_START, PDE_START, PDPTE_START, PML4_START};
+use layout::{BOOT_GDT_START, BOOT_IDT_START, PDE_START, PDPTE_START, PML4_START, PVH_INFO_START};
-use vm_memory::{Address, Bytes, GuestMemory, GuestMemoryMmap};
+use vm_memory::{Address, Bytes, GuestMemory, GuestMemoryError, GuestMemoryMmap};
 
 // MTRR constants
 const MTRR_ENABLE: u64 = 0x800; // IA32_MTRR_DEF_TYPE MSR: E (MTRRs enabled) flag, bit 11
@@ -30,16 +33,18 @@ pub enum Error {
     SetModelSpecificRegisters(kvm_ioctls::Error),
     /// Failed to set SREGs for this CPU.
     SetStatusRegisters(kvm_ioctls::Error),
+    /// Checking the GDT address failed.
+    CheckGDTAddr,
     /// Writing the GDT to RAM failed.
-    WriteGDT,
+    WriteGDT(GuestMemoryError),
     /// Writing the IDT to RAM failed.
-    WriteIDT,
+    WriteIDT(GuestMemoryError),
     /// Writing PDPTE to RAM failed.
-    WritePDPTEAddress,
+    WritePDPTEAddress(GuestMemoryError),
     /// Writing PDE to RAM failed.
-    WritePDEAddress,
+    WritePDEAddress(GuestMemoryError),
     /// Writing PML4 to RAM failed.
-    WritePML4Address,
+    WritePML4Address(GuestMemoryError),
 }
 
 pub type Result<T> = result::Result<T, Error>;
@@ -79,16 +84,31 @@ pub fn setup_msrs(vcpu: &VcpuFd) -> Result<()> {
 /// * `boot_ip` - Starting instruction pointer.
 /// * `boot_sp` - Starting stack pointer.
 /// * `boot_si` - Must point to zero page address per Linux ABI.
-pub fn setup_regs(vcpu: &VcpuFd, boot_ip: u64, boot_sp: u64, boot_si: u64) -> Result<()> {
+pub fn setup_regs(
-    let regs: kvm_regs = kvm_regs {
+    vcpu: &VcpuFd,
-        rflags: 0x0000000000000002u64,
+    boot_ip: u64,
-        rip: boot_ip,
+    boot_sp: u64,
-        rsp: boot_sp,
+    boot_si: u64,
-        rbp: boot_sp,
+    boot_prot: BootProtocol,
-        rsi: boot_si,
+) -> Result<()> {
-        ..Default::default()
+    let regs: kvm_regs = match boot_prot {
+        // Configure regs as required by PVH boot protocol.
+        BootProtocol::PvhBoot => kvm_regs {
+            rflags: 0x0000000000000002u64,
+            rbx: PVH_INFO_START.raw_value(),
+            rip: boot_ip,
+            ..Default::default()
+        },
+        // Configure regs as required by Linux 64-bit boot protocol.
+        BootProtocol::LinuxBoot => kvm_regs {
+            rflags: 0x0000000000000002u64,
+            rip: boot_ip,
+            rsp: boot_sp,
+            rbp: boot_sp,
+            rsi: boot_si,
+            ..Default::default()
+        },
     };
-
     vcpu.set_regs(&regs).map_err(Error::SetBaseRegisters)
 }
 
@@ -98,11 +118,14 @@ pub fn setup_regs(vcpu: &VcpuFd, boot_ip: u64, boot_sp: u64, boot_si: u64) -> Re
 ///
 /// * `mem` - The memory that will be passed to the guest.
 /// * `vcpu` - Structure for the VCPU that holds the VCPU's fd.
-pub fn setup_sregs(mem: &GuestMemoryMmap, vcpu: &VcpuFd) -> Result<()> {
+pub fn setup_sregs(mem: &GuestMemoryMmap, vcpu: &VcpuFd, boot_prot: BootProtocol) -> Result<()> {
     let mut sregs: kvm_sregs = vcpu.get_sregs().map_err(Error::GetStatusRegisters)?;
 
-    configure_segments_and_sregs(mem, &mut sregs)?;
+    configure_segments_and_sregs(mem, &mut sregs, boot_prot)?;
-    setup_page_tables(mem, &mut sregs)?; // TODO(dgreid) - Can this be done once per system instead?
+
+    if let BootProtocol::LinuxBoot = boot_prot {
+        setup_page_tables(mem, &mut sregs)?; // TODO(dgreid) - Can this be done once per system instead?
+    }
 
     vcpu.set_sregs(&sregs).map_err(Error::SetStatusRegisters)
 }
@@ -121,10 +144,8 @@ fn write_gdt_table(table: &[u64], guest_mem: &GuestMemoryMmap) -> Result<()> {
     for (index, entry) in table.iter().enumerate() {
         let addr = guest_mem
             .checked_offset(boot_gdt_addr, index * mem::size_of::<u64>())
-            .ok_or(Error::WriteGDT)?;
+            .ok_or(Error::CheckGDTAddr)?;
-        guest_mem
+        guest_mem.write_obj(*entry, addr).map_err(Error::WriteGDT)?;
-            .write_obj(*entry, addr)
-            .map_err(|_| Error::WriteGDT)?;
     }
     Ok(())
 }
@@ -133,16 +154,34 @@ fn write_idt_value(val: u64, guest_mem: &GuestMemoryMmap) -> Result<()> {
     let boot_idt_addr = BOOT_IDT_START;
     guest_mem
         .write_obj(val, boot_idt_addr)
-        .map_err(|_| Error::WriteIDT)
+        .map_err(Error::WriteIDT)
 }
 
-fn configure_segments_and_sregs(mem: &GuestMemoryMmap, sregs: &mut kvm_sregs) -> Result<()> {
+fn configure_segments_and_sregs(
-    let gdt_table: [u64; BOOT_GDT_MAX as usize] = [
+    mem: &GuestMemoryMmap,
-        gdt_entry(0, 0, 0),            // NULL
+    sregs: &mut kvm_sregs,
-        gdt_entry(0xa09b, 0, 0xfffff), // CODE
+    boot_prot: BootProtocol,
-        gdt_entry(0xc093, 0, 0xfffff), // DATA
+) -> Result<()> {
-        gdt_entry(0x808b, 0, 0xfffff), // TSS
+    let gdt_table: [u64; BOOT_GDT_MAX as usize] = match boot_prot {
-    ];
+        BootProtocol::PvhBoot => {
+            // Configure GDT entries as specified by PVH boot protocol
+            [
+                gdt_entry(0, 0, 0),               // NULL
+                gdt_entry(0xc09b, 0, 0xffffffff), // CODE
+                gdt_entry(0xc093, 0, 0xffffffff), // DATA
+                gdt_entry(0x008b, 0, 0x67),       // TSS
+            ]
+        }
+        BootProtocol::LinuxBoot => {
+            // Configure GDT entries as specified by Linux 64bit boot protocol
+            [
+                gdt_entry(0, 0, 0),            // NULL
+                gdt_entry(0xa09b, 0, 0xfffff), // CODE
+                gdt_entry(0xc093, 0, 0xfffff), // DATA
+                gdt_entry(0x808b, 0, 0xfffff), // TSS
+            ]
+        }
+    };
 
     let code_seg = kvm_segment_from_gdt(gdt_table[1], 1);
     let data_seg = kvm_segment_from_gdt(gdt_table[2], 2);
@@ -165,9 +204,17 @@ fn configure_segments_and_sregs(mem: &GuestMemoryMmap, sregs: &mut kvm_sregs) ->
     sregs.ss = data_seg;
     sregs.tr = tss_seg;
 
-    /* 64-bit protected mode */
+    match boot_prot {
-    sregs.cr0 |= X86_CR0_PE;
+        BootProtocol::PvhBoot => {
-    sregs.efer |= EFER_LME | EFER_LMA;
+            sregs.cr0 = X86_CR0_PE;
+            sregs.cr4 = 0;
+        }
+        BootProtocol::LinuxBoot => {
+            /* 64-bit protected mode */
+            sregs.cr0 |= X86_CR0_PE;
+            sregs.efer |= EFER_LME | EFER_LMA;
+        }
+    }
 
     Ok(())
 }
@@ -177,16 +224,16 @@ fn setup_page_tables(mem: &GuestMemoryMmap, sregs: &mut kvm_sregs) -> Result<()>
 
     // Entry covering VA [0..512GB)
     mem.write_obj(PDPTE_START.raw_value() | 0x03, PML4_START)
-        .map_err(|_| Error::WritePML4Address)?;
+        .map_err(Error::WritePML4Address)?;
 
     // Entry covering VA [0..1GB)
     mem.write_obj(PDE_START.raw_value() | 0x03, PDPTE_START)
-        .map_err(|_| Error::WritePDPTEAddress)?;
+        .map_err(Error::WritePDPTEAddress)?;
     // 512 2MB entries together covering VA [0..1GB). Note we are assuming
     // CPU supports 2MB pages (/proc/cpuinfo has 'pse'). All modern CPUs do.
     for i in 0..512 {
         mem.write_obj((i << 21) + 0x83u64, PDE_START.unchecked_add(i * 8))
-            .map_err(|_| Error::WritePDEAddress)?;
+            .map_err(Error::WritePDEAddress)?;
     }
 
     sregs.cr3 = PML4_START.raw_value();
@@ -269,7 +316,7 @@ mod tests {
     use vm_memory::{GuestAddress, GuestMemoryMmap};
 
     fn create_guest_mem() -> GuestMemoryMmap {
-        GuestMemoryMmap::new(&vec![(GuestAddress(0), 0x10000)]).unwrap()
+        GuestMemoryMmap::from_ranges(&vec![(GuestAddress(0), 0x10000)]).unwrap()
     }
 
     fn read_u64(gm: &GuestMemoryMmap, offset: GuestAddress) -> u64 {
@@ -280,7 +327,7 @@ mod tests {
     fn segments_and_sregs() {
         let mut sregs: kvm_sregs = Default::default();
         let gm = create_guest_mem();
-        configure_segments_and_sregs(&gm, &mut sregs).unwrap();
+        configure_segments_and_sregs(&gm, &mut sregs, BootProtocol::LinuxBoot).unwrap();
 
         assert_eq!(0x0, read_u64(&gm, BOOT_GDT_START));
         assert_eq!(
@@ -298,16 +345,46 @@ mod tests {
         assert_eq!(0x0, read_u64(&gm, BOOT_IDT_START));
 
         assert_eq!(0, sregs.cs.base);
-        assert_eq!(0xfffff, sregs.ds.limit);
+        assert_eq!(0xffffffff, sregs.ds.limit);
         assert_eq!(0x10, sregs.es.selector);
         assert_eq!(1, sregs.fs.present);
         assert_eq!(1, sregs.gs.g);
         assert_eq!(0, sregs.ss.avl);
         assert_eq!(0, sregs.tr.base);
-        assert_eq!(0xfffff, sregs.tr.limit);
+        assert_eq!(0xffffffff, sregs.tr.limit);
         assert_eq!(0, sregs.tr.avl);
         assert_eq!(X86_CR0_PE, sregs.cr0);
         assert_eq!(EFER_LME | EFER_LMA, sregs.efer);
+
+        configure_segments_and_sregs(&gm, &mut sregs, BootProtocol::PvhBoot).unwrap();
+        assert_eq!(0x0, read_u64(&gm, BOOT_GDT_START));
+        assert_eq!(
+            0xcf9b000000ffff,
+            read_u64(&gm, BOOT_GDT_START.unchecked_add(8))
+        );
+        assert_eq!(
+            0xcf93000000ffff,
+            read_u64(&gm, BOOT_GDT_START.unchecked_add(16))
+        );
+        assert_eq!(
+            0x8b0000000067,
+            read_u64(&gm, BOOT_GDT_START.unchecked_add(24))
+        );
+        assert_eq!(0x0, read_u64(&gm, BOOT_IDT_START));
+
+        assert_eq!(0, sregs.cs.base);
+        assert_eq!(0xffffffff, sregs.ds.limit);
+        assert_eq!(0x10, sregs.es.selector);
+        assert_eq!(1, sregs.fs.present);
+        assert_eq!(1, sregs.gs.g);
+        assert_eq!(0, sregs.ss.avl);
+        assert_eq!(0, sregs.tr.base);
+        assert_eq!(0, sregs.tr.g);
+        assert_eq!(0x67, sregs.tr.limit);
+        assert_eq!(0xb, sregs.tr.type_);
+        assert_eq!(0, sregs.tr.avl);
+        assert_eq!(X86_CR0_PE, sregs.cr0);
+        assert_eq!(0, sregs.cr4);
     }
 
     #[test]
@@ -398,6 +475,7 @@ mod tests {
             expected_regs.rip,
             expected_regs.rsp,
             expected_regs.rsi,
+            BootProtocol::LinuxBoot,
         )
         .unwrap();
 
@@ -413,10 +491,10 @@ mod tests {
 
         let mut expected_sregs: kvm_sregs = vcpu.get_sregs().unwrap();
         let gm = create_guest_mem();
-        configure_segments_and_sregs(&gm, &mut expected_sregs).unwrap();
+        configure_segments_and_sregs(&gm, &mut expected_sregs, BootProtocol::LinuxBoot).unwrap();
         setup_page_tables(&gm, &mut expected_sregs).unwrap();
 
-        setup_sregs(&gm, &vcpu).unwrap();
+        setup_sregs(&gm, &vcpu, BootProtocol::LinuxBoot).unwrap();
         let actual_sregs: kvm_sregs = vcpu.get_sregs().unwrap();
         assert_eq!(expected_sregs, actual_sregs);
     }

arch_gen/src/x86/mod.rs

@@ -16,7 +16,6 @@
     clippy::should_implement_trait,
     clippy::transmute_ptr_to_ptr
 )]
-pub mod bootparam;
 #[allow(non_camel_case_types)]
 #[allow(non_upper_case_globals)]
 #[allow(clippy::unreadable_literal, clippy::redundant_static_lifetimes)]

build.rs

@@ -0,0 +1,22 @@
+// Copyright © 2020 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+use std::process::Command;
+
+fn main() {
+    let git_out = Command::new("git")
+        .args(&["describe", "--dirty"])
+        .output()
+        .expect("Expect to get git describe output");
+
+    // This println!() has a special behavior, as it will set the environment
+    // variable BUILT_VERSION, so that it can be reused from the binary.
+    // Particularly, this is used from src/main.rs to display the exact
+    // version.
+    println!(
+        "cargo:rustc-env=BUILT_VERSION={}",
+        String::from_utf8(git_out.stdout).unwrap()
+    );
+}

devices/Cargo.toml

@@ -4,13 +4,14 @@ version = "0.1.0"
 authors = ["The Chromium OS Authors"]
 
 [dependencies]
-byteorder = "1.3.2"
+bitflags = ">=1.2.1"
+byteorder = "1.3.4"
 epoll = ">=4.0.1"
-kvm-bindings = "0.2.0"
+libc = "0.2.68"
-kvm-ioctls = "0.4.0"
-libc = "0.2.60"
 log = "0.4.8"
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+vm-device = { path = "../vm-device" }
+acpi_tables = { path = "../acpi_tables", optional = true }
+vm-memory = "0.1.0"
 vmm-sys-util = ">=0.3.1"
 
 [dev-dependencies]
@@ -18,5 +19,5 @@ tempfile = "3.1.0"
 
 [features]
 default = []
-acpi = []
+acpi = ["acpi_tables"]
 cmos = []

devices/src/acpi.rs

@@ -3,10 +3,12 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+use acpi_tables::{aml, aml::Aml};
+use std::sync::Arc;
+use vm_device::interrupt::InterruptSourceGroup;
 use vmm_sys_util::eventfd::EventFd;
 use BusDevice;
-use HotPlugNotificationType;
+use HotPlugNotificationFlags;
-use Interrupt;
 
 /// A device for handling ACPI shutdown and reboot
 pub struct AcpiShutdownDevice {
@@ -46,6 +48,7 @@ impl BusDevice for AcpiShutdownDevice {
         const SLEEP_VALUE_BIT: u8 = 2;
         if data[0] == (S5_SLEEP_VALUE << SLEEP_VALUE_BIT) | (1 << SLEEP_STATUS_EN_BIT) {
             debug!("ACPI Shutdown signalled");
+            extern crate bitflags;
             if let Err(e) = self.exit_evt.write(1) {
                 error!("Error triggering ACPI shutdown event: {}", e);
             }
@@ -55,26 +58,26 @@ impl BusDevice for AcpiShutdownDevice {
 
 /// A device for handling ACPI GED event generation
 pub struct AcpiGEDDevice {
-    interrupt: Box<dyn Interrupt>,
+    interrupt: Arc<Box<dyn InterruptSourceGroup>>,
-    notification_type: HotPlugNotificationType,
+    notification_type: HotPlugNotificationFlags,
     ged_irq: u32,
 }
 
 impl AcpiGEDDevice {
-    pub fn new(interrupt: Box<dyn Interrupt>, ged_irq: u32) -> AcpiGEDDevice {
+    pub fn new(interrupt: Arc<Box<dyn InterruptSourceGroup>>, ged_irq: u32) -> AcpiGEDDevice {
         AcpiGEDDevice {
             interrupt,
-            notification_type: HotPlugNotificationType::NoDevicesChanged,
+            notification_type: HotPlugNotificationFlags::NO_DEVICES_CHANGED,
             ged_irq,
         }
     }
 
     pub fn notify(
         &mut self,
-        notification_type: HotPlugNotificationType,
+        notification_type: HotPlugNotificationFlags,
     ) -> Result<(), std::io::Error> {
-        self.notification_type = notification_type;
+        self.notification_type |= notification_type;
-        self.interrupt.deliver()
+        self.interrupt.trigger(0)
     }
 
     pub fn irq(&self) -> u32 {
@@ -86,9 +89,63 @@ impl AcpiGEDDevice {
 impl BusDevice for AcpiGEDDevice {
     // Spec has all fields as zero
     fn read(&mut self, _base: u64, _offset: u64, data: &mut [u8]) {
-        data[0] = self.notification_type as u8;
+        data[0] = self.notification_type.bits();
-        self.notification_type = HotPlugNotificationType::NoDevicesChanged;
+        self.notification_type = HotPlugNotificationFlags::NO_DEVICES_CHANGED;
     }
 
     fn write(&mut self, _base: u64, _offset: u64, _data: &[u8]) {}
 }
+
+#[cfg(feature = "acpi")]
+impl Aml for AcpiGEDDevice {
+    fn to_aml_bytes(&self) -> Vec<u8> {
+        aml::Device::new(
+            "_SB_.GED_".into(),
+            vec![
+                &aml::Name::new("_HID".into(), &"ACPI0013"),
+                &aml::Name::new("_UID".into(), &aml::ZERO),
+                &aml::Name::new(
+                    "_CRS".into(),
+                    &aml::ResourceTemplate::new(vec![&aml::Interrupt::new(
+                        true,
+                        true,
+                        false,
+                        false,
+                        self.ged_irq,
+                    )]),
+                ),
+                &aml::OpRegion::new("GDST".into(), aml::OpRegionSpace::SystemIO, 0xb000, 0x1),
+                &aml::Field::new(
+                    "GDST".into(),
+                    aml::FieldAccessType::Byte,
+                    aml::FieldUpdateRule::WriteAsZeroes,
+                    vec![aml::FieldEntry::Named(*b"GDAT", 8)],
+                ),
+                &aml::Method::new(
+                    "_EVT".into(),
+                    1,
+                    true,
+                    vec![
+                        &aml::Store::new(&aml::Local(0), &aml::Path::new("GDAT")),
+                        &aml::And::new(&aml::Local(1), &aml::Local(0), &aml::ONE),
+                        &aml::If::new(
+                            &aml::Equal::new(&aml::Local(1), &aml::ONE),
+                            vec![&aml::MethodCall::new("\\_SB_.CPUS.CSCN".into(), vec![])],
+                        ),
+                        &aml::And::new(&aml::Local(1), &aml::Local(0), &2usize),
+                        &aml::If::new(
+                            &aml::Equal::new(&aml::Local(1), &2usize),
+                            vec![&aml::MethodCall::new("\\_SB_.MHPC.MSCN".into(), vec![])],
+                        ),
+                        &aml::And::new(&aml::Local(1), &aml::Local(0), &4usize),
+                        &aml::If::new(
+                            &aml::Equal::new(&aml::Local(1), &4usize),
+                            vec![&aml::MethodCall::new("\\_SB_.PCI0.PCNT".into(), vec![])],
+                        ),
+                    ],
+                ),
+            ],
+        )
+        .to_aml_bytes()
+    }
+}

devices/src/bus.rs

@@ -9,7 +9,7 @@
 
 use std::cmp::{Ord, Ordering, PartialEq, PartialOrd};
 use std::collections::btree_map::BTreeMap;
-use std::sync::{Arc, Mutex, RwLock};
+use std::sync::{Arc, Mutex, RwLock, Weak};
 use std::{convert, error, fmt, io, result};
 
 /// Trait for devices that respond to reads or writes in an arbitrary address space.
@@ -95,7 +95,7 @@ impl PartialOrd for BusRange {
 /// only restriction is that no two devices can overlap in this address space.
 #[derive(Default)]
 pub struct Bus {
-    devices: RwLock<BTreeMap<BusRange, Arc<Mutex<dyn BusDevice>>>>,
+    devices: RwLock<BTreeMap<BusRange, Weak<Mutex<dyn BusDevice>>>>,
 }
 
 impl Bus {
@@ -112,7 +112,7 @@ impl Bus {
             .range(..=BusRange { base: addr, len: 1 })
             .rev()
             .next()?;
-        Some((*range, dev.clone()))
+        Some((*range, dev.upgrade().unwrap().clone()))
     }
 
     #[allow(clippy::type_complexity)]
@@ -147,7 +147,7 @@ impl Bus {
             .devices
             .write()
             .unwrap()
-            .insert(BusRange { base, len }, device)
+            .insert(BusRange { base, len }, Arc::downgrade(&device))
             .is_some()
         {
             return Err(Error::Overlap);
@@ -171,6 +171,24 @@ impl Bus {
         Ok(())
     }
 
+    /// Removes all entries referencing the given device.
+    pub fn remove_by_device(&self, device: &Arc<Mutex<dyn BusDevice>>) -> Result<()> {
+        let mut device_list = self.devices.write().unwrap();
+        let mut remove_key_list = Vec::new();
+
+        for (key, value) in device_list.iter() {
+            if Arc::ptr_eq(&value.upgrade().unwrap(), device) {
+                remove_key_list.push(*key);
+            }
+        }
+
+        for key in remove_key_list.iter() {
+            device_list.remove(key);
+        }
+
+        Ok(())
+    }
+
     /// Updates the address range for an existing device.
     pub fn update_range(
         &self,
@@ -312,9 +330,8 @@ mod tests {
 
         let bus = Bus::new();
         let mut data = [1, 2, 3, 4];
-        assert!(bus
+        let device = Arc::new(Mutex::new(DummyDevice));
-            .insert(Arc::new(Mutex::new(DummyDevice)), 0x10, 0x10)
+        assert!(bus.insert(device.clone(), 0x10, 0x10).is_ok());
-            .is_ok());
         assert!(bus.write(0x10, &mut data));
         assert!(bus.read(0x10, &mut data));
         assert_eq!(data, [1, 2, 3, 4]);

devices/src/ioapic.rs

@@ -11,22 +11,35 @@
 
 use crate::BusDevice;
 use byteorder::{ByteOrder, LittleEndian};
-use kvm_bindings::kvm_msi;
+use std::io;
-use kvm_ioctls::VmFd;
 use std::result;
 use std::sync::Arc;
+use vm_device::interrupt::{
+    InterruptIndex, InterruptManager, InterruptSourceConfig, InterruptSourceGroup,
+    MsiIrqGroupConfig, MsiIrqSourceConfig,
+};
 use vm_memory::GuestAddress;
 
 #[derive(Debug)]
 pub enum Error {
-    /// Failed to send an interrupt.
-    InterruptFailed(kvm_ioctls::Error),
     /// Invalid destination mode.
     InvalidDestinationMode,
     /// Invalid trigger mode.
     InvalidTriggerMode,
     /// Invalid delivery mode.
     InvalidDeliveryMode,
+    /// Failed creating the interrupt source group.
+    CreateInterruptSourceGroup(io::Error),
+    /// Failed triggering the interrupt.
+    TriggerInterrupt(io::Error),
+    /// Failed masking the interrupt.
+    MaskInterrupt(io::Error),
+    /// Failed unmasking the interrupt.
+    UnmaskInterrupt(io::Error),
+    /// Failed updating the interrupt.
+    UpdateInterrupt(io::Error),
+    /// Failed enabling the interrupt.
+    EnableInterrupt(io::Error),
 }
 
 type Result<T> = result::Result<T, Error>;
@@ -156,8 +169,8 @@ pub struct Ioapic {
     id: u32,
     reg_sel: u32,
     reg_entries: [RedirectionTableEntry; NUM_IOAPIC_PINS],
-    vm_fd: Arc<VmFd>,
     apic_address: GuestAddress,
+    interrupt_source_group: Arc<Box<dyn InterruptSourceGroup>>,
 }
 
 impl BusDevice for Ioapic {
@@ -196,14 +209,28 @@ impl BusDevice for Ioapic {
 }
 
 impl Ioapic {
-    pub fn new(vm_fd: Arc<VmFd>, apic_address: GuestAddress) -> Ioapic {
+    pub fn new(
-        Ioapic {
+        apic_address: GuestAddress,
+        interrupt_manager: Arc<dyn InterruptManager<GroupConfig = MsiIrqGroupConfig>>,
+    ) -> Result<Ioapic> {
+        let interrupt_source_group = interrupt_manager
+            .create_group(MsiIrqGroupConfig {
+                base: 0 as InterruptIndex,
+                count: NUM_IOAPIC_PINS as InterruptIndex,
+            })
+            .map_err(Error::CreateInterruptSourceGroup)?;
+
+        interrupt_source_group
+            .enable()
+            .map_err(Error::EnableInterrupt)?;
+
+        Ok(Ioapic {
             id: 0,
             reg_sel: 0,
             reg_entries: [0; NUM_IOAPIC_PINS],
-            vm_fd,
             apic_address,
-        }
+            interrupt_source_group,
+        })
     }
 
     // The ioapic must be informed about EOIs in order to deassert interrupts
@@ -223,16 +250,30 @@ impl Ioapic {
     pub fn service_irq(&mut self, irq: usize) -> Result<()> {
         let entry = &mut self.reg_entries[irq];
 
-        // Don't inject the interrupt if the IRQ is masked
+        self.interrupt_source_group
-        if interrupt_mask(*entry) == 1 {
+            .trigger(irq as InterruptIndex)
-            return Ok(());
+            .map_err(Error::TriggerInterrupt)?;
+        debug!("Interrupt successfully delivered");
+
+        // If trigger mode is level sensitive, set the Remote IRR bit.
+        // It will be cleared when the EOI is received.
+        if trigger_mode(*entry) == 1 {
+            set_remote_irr(entry, 1);
         }
+        // Clear the Delivery Status bit
+        set_delivery_status(entry, 0);
+
+        Ok(())
+    }
+
+    fn update_entry(&self, irq: usize) -> Result<()> {
+        let entry = self.reg_entries[irq];
 
         // Validate Destination Mode value, and retrieve Destination ID
-        let destination_mode = destination_mode(*entry);
+        let destination_mode = destination_mode(entry);
         let destination_id: u8 = match destination_mode {
-            x if x == DestinationMode::Physical as u8 => destination_field_physical(*entry),
+            x if x == DestinationMode::Physical as u8 => destination_field_physical(entry),
-            x if x == DestinationMode::Logical as u8 => destination_field_logical(*entry),
+            x if x == DestinationMode::Logical as u8 => destination_field_logical(entry),
             _ => return Err(Error::InvalidDestinationMode),
         };
 
@@ -242,20 +283,20 @@ impl Ioapic {
         let redirection_hint: u8 = 1;
 
         // Generate MSI message address
-        let address_lo: u32 = self.apic_address.0 as u32
+        let low_addr: u32 = self.apic_address.0 as u32
             | u32::from(destination_id) << 12
             | u32::from(redirection_hint) << 3
             | u32::from(destination_mode) << 2;
 
         // Validate Trigger Mode value
-        let trigger_mode = trigger_mode(*entry);
+        let trigger_mode = trigger_mode(entry);
         match trigger_mode {
             x if (x == TriggerMode::Edge as u8) || (x == TriggerMode::Level as u8) => {}
             _ => return Err(Error::InvalidTriggerMode),
         }
 
         // Validate Delivery Mode value
-        let delivery_mode = delivery_mode(*entry);
+        let delivery_mode = delivery_mode(entry);
         match delivery_mode {
             x if (x == DeliveryMode::Fixed as u8)
                 || (x == DeliveryMode::Lowest as u8)
@@ -270,37 +311,31 @@ impl Ioapic {
 
         // Generate MSI message data
         let data: u32 = u32::from(trigger_mode) << 15
-            | u32::from(remote_irr(*entry)) << 14
+            | u32::from(remote_irr(entry)) << 14
             | u32::from(delivery_mode) << 8
-            | u32::from(vector(*entry));
+            | u32::from(vector(entry));
 
-        let msi = kvm_msi {
+        let config = MsiIrqSourceConfig {
-            address_lo,
+            high_addr: 0x0,
-            address_hi: 0x0,
+            low_addr,
             data,
-            flags: 0u32,
-            devid: 0u32,
-            pad: [0u8; 12],
         };
 
-        match self.vm_fd.signal_msi(msi) {
+        self.interrupt_source_group
-            Ok(ret) => {
+            .update(irq as InterruptIndex, InterruptSourceConfig::MsiIrq(config))
-                if ret > 0 {
+            .map_err(Error::UpdateInterrupt)?;
-                    debug!("MSI message successfully delivered");
+
-                    // If trigger mode is level sensitive, set the Remote IRR bit.
+        if interrupt_mask(entry) == 1 {
-                    // It will be cleared when the EOI is received.
+            self.interrupt_source_group
-                    if trigger_mode == 1 {
+                .mask(irq as InterruptIndex)
-                        set_remote_irr(entry, 1);
+                .map_err(Error::MaskInterrupt)?;
-                    }
+        } else {
-                    // Clear the Delivery Status bit
+            self.interrupt_source_group
-                    set_delivery_status(entry, 0);
+                .unmask(irq as InterruptIndex)
-                } else {
+                .map_err(Error::UnmaskInterrupt)?;
-                    warn!("failed to deliver MSI message, blocked by guest");
-                }
-                Ok(())
-            }
-            Err(e) => Err(Error::InterruptFailed(e)),
         }
+
+        Ok(())
     }
 
     fn ioapic_write(&mut self, val: u32) {
@@ -320,6 +355,11 @@ impl Ioapic {
                     self.reg_entries[index] &= 0xffff_ffff_0000_5000;
                     self.reg_entries[index] |= u64::from(val) & 0xffff_afff;
                 }
+                // The entry must be updated through the interrupt source
+                // group.
+                if let Err(e) = self.update_entry(index) {
+                    error!("Failed updating IOAPIC entry: {:?}", e);
+                }
             }
             _ => error!("IOAPIC: invalid write to register offset"),
         }

devices/src/legacy/serial.rs

@@ -5,9 +5,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE-BSD-3-Clause file.
 
-use crate::{BusDevice, Interrupt};
+use crate::BusDevice;
 use std::collections::VecDeque;
+use std::sync::Arc;
 use std::{io, result};
+use vm_device::interrupt::InterruptSourceGroup;
 use vmm_sys_util::errno::Result;
 
 const LOOP_SIZE: usize = 0x40;
@@ -55,7 +57,7 @@ const DEFAULT_BAUD_DIVISOR: u16 = 12; // 9600 bps
 pub struct Serial {
     interrupt_enable: u8,
     interrupt_identification: u8,
-    interrupt: Box<dyn Interrupt>,
+    interrupt: Arc<Box<dyn InterruptSourceGroup>>,
     line_control: u8,
     line_status: u8,
     modem_control: u8,
@@ -67,7 +69,10 @@ pub struct Serial {
 }
 
 impl Serial {
-    pub fn new(interrupt: Box<dyn Interrupt>, out: Option<Box<dyn io::Write + Send>>) -> Serial {
+    pub fn new(
+        interrupt: Arc<Box<dyn InterruptSourceGroup>>,
+        out: Option<Box<dyn io::Write + Send>>,
+    ) -> Serial {
         Serial {
             interrupt_enable: 0,
             interrupt_identification: DEFAULT_INTERRUPT_IDENTIFICATION,
@@ -84,12 +89,15 @@ impl Serial {
     }
 
     /// Constructs a Serial port ready for output.
-    pub fn new_out(interrupt: Box<dyn Interrupt>, out: Box<dyn io::Write + Send>) -> Serial {
+    pub fn new_out(
+        interrupt: Arc<Box<dyn InterruptSourceGroup>>,
+        out: Box<dyn io::Write + Send>,
+    ) -> Serial {
         Self::new(interrupt, Some(out))
     }
 
     /// Constructs a Serial port with no connected output.
-    pub fn new_sink(interrupt: Box<dyn Interrupt>) -> Serial {
+    pub fn new_sink(interrupt: Arc<Box<dyn InterruptSourceGroup>>) -> Serial {
         Self::new(interrupt, None)
     }
 
@@ -149,7 +157,7 @@ impl Serial {
     }
 
     fn trigger_interrupt(&mut self) -> result::Result<(), io::Error> {
-        self.interrupt.deliver()
+        self.interrupt.trigger(0)
     }
 
     fn iir_reset(&mut self) {
@@ -233,16 +241,24 @@ mod tests {
     use super::*;
     use std::io;
     use std::sync::{Arc, Mutex};
+    use vm_device::interrupt::{InterruptIndex, InterruptSourceConfig};
     use vmm_sys_util::eventfd::EventFd;
 
     struct TestInterrupt {
         event_fd: EventFd,
     }
 
-    impl Interrupt for TestInterrupt {
+    impl InterruptSourceGroup for TestInterrupt {
-        fn deliver(&self) -> result::Result<(), std::io::Error> {
+        fn trigger(&self, _index: InterruptIndex) -> result::Result<(), std::io::Error> {
             self.event_fd.write(1)
         }
+        fn update(
+            &self,
+            _index: InterruptIndex,
+            _config: InterruptSourceConfig,
+        ) -> result::Result<(), std::io::Error> {
+            Ok(())
+        }
     }
 
     impl TestInterrupt {
@@ -278,7 +294,7 @@ mod tests {
         let intr_evt = EventFd::new(0).unwrap();
         let serial_out = SharedBuffer::new();
         let mut serial = Serial::new_out(
-            Box::new(TestInterrupt::new(intr_evt.try_clone().unwrap())),
+            Arc::new(Box::new(TestInterrupt::new(intr_evt.try_clone().unwrap()))),
             Box::new(serial_out.clone()),
         );
 
@@ -297,7 +313,7 @@ mod tests {
         let intr_evt = EventFd::new(0).unwrap();
         let serial_out = SharedBuffer::new();
         let mut serial = Serial::new_out(
-            Box::new(TestInterrupt::new(intr_evt.try_clone().unwrap())),
+            Arc::new(Box::new(TestInterrupt::new(intr_evt.try_clone().unwrap()))),
             Box::new(serial_out.clone()),
         );
 
@@ -334,8 +350,9 @@ mod tests {
     #[test]
     fn serial_thr() {
         let intr_evt = EventFd::new(0).unwrap();
-        let mut serial =
+        let mut serial = Serial::new_sink(Arc::new(Box::new(TestInterrupt::new(
-            Serial::new_sink(Box::new(TestInterrupt::new(intr_evt.try_clone().unwrap())));
+            intr_evt.try_clone().unwrap(),
+        ))));
 
         // write 1 to the interrupt event fd, so that read doesn't block in case the event fd
         // counter doesn't change (for 0 it blocks)
@@ -354,8 +371,9 @@ mod tests {
     #[test]
     fn serial_dlab() {
         let intr_evt = EventFd::new(0).unwrap();
-        let mut serial =
+        let mut serial = Serial::new_sink(Arc::new(Box::new(TestInterrupt::new(
-            Serial::new_sink(Box::new(TestInterrupt::new(intr_evt.try_clone().unwrap())));
+            intr_evt.try_clone().unwrap(),
+        ))));
 
         serial.write(0, LCR as u64, &[LCR_DLAB_BIT as u8]);
         serial.write(0, DLAB_LOW as u64, &[0x12 as u8]);
@@ -373,8 +391,9 @@ mod tests {
     #[test]
     fn serial_modem() {
         let intr_evt = EventFd::new(0).unwrap();
-        let mut serial =
+        let mut serial = Serial::new_sink(Arc::new(Box::new(TestInterrupt::new(
-            Serial::new_sink(Box::new(TestInterrupt::new(intr_evt.try_clone().unwrap())));
+            intr_evt.try_clone().unwrap(),
+        ))));
 
         serial.write(0, MCR as u64, &[MCR_LOOP_BIT as u8]);
         serial.write(0, DATA as u64, &['a' as u8]);
@@ -397,8 +416,9 @@ mod tests {
     #[test]
     fn serial_scratch() {
         let intr_evt = EventFd::new(0).unwrap();
-        let mut serial =
+        let mut serial = Serial::new_sink(Arc::new(Box::new(TestInterrupt::new(
-            Serial::new_sink(Box::new(TestInterrupt::new(intr_evt.try_clone().unwrap())));
+            intr_evt.try_clone().unwrap(),
+        ))));
 
         serial.write(0, SCR as u64, &[0x12 as u8]);
 

devices/src/lib.rs

@@ -6,18 +6,21 @@
 // found in the LICENSE-BSD-3-Clause file.
 
 //! Emulates virtual and hardware devices.
+#[macro_use]
+extern crate bitflags;
 extern crate byteorder;
 extern crate epoll;
-extern crate kvm_bindings;
-extern crate kvm_ioctls;
 extern crate libc;
 #[macro_use]
 extern crate log;
+#[cfg(feature = "acpi")]
+extern crate acpi_tables;
+extern crate vm_device;
 extern crate vm_memory;
 extern crate vmm_sys_util;
 
 use std::fs::File;
-use std::{io, result};
+use std::io;
 
 #[cfg(feature = "acpi")]
 mod acpi;
@@ -67,12 +70,11 @@ pub enum Error {
     IoError(io::Error),
 }
 
-pub trait Interrupt: Send + Sync {
+bitflags! {
-    fn deliver(&self) -> result::Result<(), std::io::Error>;
+    pub struct HotPlugNotificationFlags: u8 {
-}
+        const NO_DEVICES_CHANGED = 0;
-
+        const CPU_DEVICES_CHANGED = 0b1;
-#[derive(Clone, Copy)]
+        const MEMORY_DEVICES_CHANGED = 0b10;
-pub enum HotPlugNotificationType {
+        const PCI_DEVICES_CHANGED = 0b100;
-    NoDevicesChanged,
+    }
-    CPUDevicesChanged,
 }

docs/api.md

@@ -0,0 +1,373 @@
+- [Cloud Hypervisor API](#cloud-hypervisor-api)
+  * [External API](#external-api)
+    + [REST API](#rest-api)
+      - [Location and availability](#location-and-availability)
+      - [Endpoints](#endpoints)
+		* [Virtual Machine Manager (VMM) Actions](#virtual-machine-manager-vmm-actions)
+		* [Virtual Machine (VM) Actions](#virtual-machine-vm-actions)
+      - [REST API Examples](#rest-api-examples)
+        * [Create a Virtual Machine](#create-a-virtual-machine)
+	    * [Boot a Virtual Machine](#boot-a-virtual-machine)
+        * [Dump a Virtual Machine Information](#dump-a-virtual-machine-information)
+        * [Reboot a Virtual Machine](#reboot-a-virtual-machine)
+        * [Shut a Virtual Machine Down](#shut-a-virtual-machine-down)
+    + [Command Line Interface](#command-line-interface)
+    + [REST API and CLI Architecural Relationship](#rest-api-and-cli-architectural-relationship)
+  * [Internal API](#internal-api)
+    + [Goals and Design](#goals-and-design)
+  * [End to End Example](#end-to-end-example)
+
+# Cloud Hypervisor API
+
+The Cloud Hypervisor API is made of 2 distinct interfaces:
+
+1. **The external API**. This is the user facing API. Users and operators can
+   control and manage Cloud Hypervisor through either a REST API or a Command
+   Line Interface (CLI).
+1. **The internal API**, based on [rust's Multi-Producer, Single-Consumer (MPSC)](https://doc.rust-lang.org/std/sync/mpsc/)
+   module. This API is used internally by the Cloud Hypervisor threads to
+   communicate between each others.
+
+The goal of this document is to describe the Cloud Hypervisor API as a whole,
+and to outline how the internal and external APIs are architecturally related.
+
+## External API
+
+### REST API
+
+The Cloud Hypervisor [REST](https://en.wikipedia.org/wiki/Representational_state_transfer)
+API triggers VM and VMM specific actions, and as such it is designed as a
+collection of RPC-style, static methods.
+
+The API is [OpenAPI 3.0](https://github.com/OAI/OpenAPI-Specification/blob/master/versions/3.0.0.md)
+compliant. Please consult the [Cloud Hypervisor API](https://raw.githubusercontent.com/cloud-hypervisor/cloud-hypervisor/master/vmm/src/api/openapi/cloud-hypervisor.yaml)
+document for more details about the API payloads and responses.
+
+### Location and availability
+
+The REST API is available as soon as the Cloud Hypervisor binary is started,
+through a local UNIX socket.
+By default, it is located at `/run/user/{user ID}/cloud-hypervisor.{Cloud Hypervisor PID}`.
+For example, if you launched Cloud Hypervisor as user ID 1000 and its PID is
+123456, the Cloud Hypervisor REST API will be available at `/run/user/1000/cloud-hypervisor.123456`.
+
+The REST API default URL can be overridden through the Cloud Hypervisor
+option `--api-socket`:
+
+```
+$ ./target/debug/cloud-hypervisor --api-socket /tmp/cloud-hypervisor.sock
+Cloud Hypervisor Guest
+    API server: /tmp/cloud-hypervisor.sock
+    vCPUs: 1
+    Memory: 512 MB
+    Kernel: None
+    Kernel cmdline:
+    Disk(s): None
+```
+
+### Endpoints
+
+The Cloud Hypervisor API exposes the following actions through its endpoints:
+
+#### Virtual Machine Manager (VMM) Actions
+
+Action                              | Endpoint        | Request Body | Response Body              | Prerequisites
+------------------------------------|-----------------|--------------|----------------------------|---------------------------
+Check for the REST API availability | `/vmm.ping`     | N/A          | `/schemas/VmmPingResponse` | N/A
+Shut the VMM down                   | `/vmm.shutdown` | N/A          | N/A                        | The VMM is running
+
+#### Virtual Machine (VM) Actions
+
+Action                             | Endpoint            | Request Body              | Response Body     | Prerequisites
+-----------------------------------|---------------------|---------------------------|-------------------|---------------------------
+Create the VM                      | `/vm.create`        | `/schemas/VmConfig`       | N/A               | The VM is not created yet
+Delete the VM                      | `/vm.delete`        | N/A                       | N/A               | The VM is created but not booted
+Boot the VM                        | `/vm.boot`          | N/A                       | N/A               | The VM is created
+Shut the VM down                   | `/vm.shutdown`      | N/A                       | N/A               | The VM is booted
+Reboot the VM                      | `/vm.reboot`        | N/A                       | N/A               | The VM is booted
+Pause the VM                       | `/vm.pause`         | N/A                       | N/A               | The VM is booted
+Resume the VM                      | `/vm.resume`        | N/A                       | N/A               | The VM is paused
+Add/remove CPUs to/from the VM     | `/vm.resize`        | `/schemas/VmResize`       | N/A               | The VM is booted
+Remove memory from the VM          | `/vm.resize`        | `/schemas/VmResize`       | N/A               | The VM is booted
+Dump the VM information            | `/vm.info`          | N/A                       | `/schemas/VmInfo` | The VM is created
+Add VFIO PCI device to the VM      | `/vm.add-device`    | `/schemas/VmAddDevice`    | N/A               | The VM is booted
+Remove VFIO PCI device from the VM | `/vm.remove-device` | `/schemas/VmRemoveDevice` | N/A               | The VM is booted
+
+### REST API Examples
+
+For the following set of examples, we assume Cloud Hypervisor is started with
+the REST API available at `/tmp/cloud-hypervisor.sock`:
+
+```
+$ ./target/debug/cloud-hypervisor --api-socket /tmp/cloud-hypervisor.sock
+Cloud Hypervisor Guest
+    API server: /tmp/cloud-hypervisor.sock
+    vCPUs: 1
+    Memory: 512 MB
+    Kernel: None
+    Kernel cmdline:
+    Disk(s): None
+```
+
+#### Create a Virtual Machine
+
+We want to create a virtual machine with the following characteristics:
+
+* 4 vCPUs
+* 1 GB of RAM
+* 1 virtio based networking interface
+* Direct kernel boot from a custom 5.5.0 Linux kernel located at
+  `/opt/clh/kernel/vmlinux-virtio-fs-virtio-iommu`
+* Using a Clear Linux image as its root filesystem, located at
+  `/opt/clh/images/clear-30080-kvm.img`
+
+```shell
+#!/bin/bash
+
+curl --unix-socket /tmp/cloud-hypervisor.sock -i \
+     -X PUT 'http://localhost/api/v1/vm.create'  \
+     -H 'Accept: application/json'               \
+     -H 'Content-Type: application/json'         \
+     -d '{
+         "cpus":{"boot_vcpus": 4, "max_vcpus": 4},
+         "kernel":{"path":"/opt/clh/kernel/vmlinux-virtio-fs-virtio-iommu"},
+         "cmdline":{"args":"console=hvc0 reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda3"},
+         "disks":[{"path":"/opt/clh/images/clear-30080-kvm.img"}],
+         "rng":{"src":"/dev/urandom"},
+         "net":[{"ip":"192.168.10.10", "mask":"255.255.255.0", "mac":"12:34:56:78:90:01"}]
+         }'
+```
+
+#### Boot a Virtual Machine
+
+Once the VM is created, we can boot it:
+
+```shell
+#!/bin/bash
+
+curl --unix-socket /tmp/cloud-hypervisor.sock -i -X PUT 'http://localhost/api/v1/vm.boot'
+```
+
+#### Dump a Virtual Machine Information
+
+We can fetch information about any VM, as soon as it's created:
+
+```shell
+#!/bin/bash
+
+curl --unix-socket /tmp/cloud-hypervisor.sock -i \
+     -X GET 'http://localhost/api/v1/vm.info' \
+     -H 'Accept: application/json'
+```
+
+#### Reboot a Virtual Machine
+
+We can reboot a VM that's already booted:
+
+```shell
+#!/bin/bash
+
+curl --unix-socket /tmp/cloud-hypervisor.sock -i -X PUT 'http://localhost/api/v1/vm.reboot'
+```
+
+#### Shut a Virtual Machine Down
+
+Once booted, we can shut a VM down from the REST API:
+
+```shell
+#!/bin/bash
+
+curl --unix-socket /tmp/cloud-hypervisor.sock -i -X PUT 'http://localhost/api/v1/vm.shutdown'
+```
+
+### Command Line Interface
+
+The Cloud Hypervisor Command Line Interface (CLI) can only be used for launching
+the Cloud Hypervisor binary, i.e. it can not be used for controlling the VMM or
+the launched VM once they're up and running.
+
+If you want to inspect the VMM, or control the VM after launching Cloud
+Hypervisor from the CLI, you must use the [REST API](#rest-api).
+
+From the CLI, one can either:
+
+1. Create and boot a complete virtual machine by using the CLI options to build
+   the VM config. Run `cloud-hypervisor --help` for a complete list of CLI
+   options. As soon as the `cloud-hypervisor` binary is launched, the
+   [REST API](#rest-api) is available for controlling and managing the VM.
+1. Start the [REST API](#rest-api) server only, by not passing any VM
+   configuration options. The VM can then be asynchronously created and booted
+   by sending HTTP commands to the [REST API](#rest-api). Check the
+   [REST API examples](#rest-api-examples) section for more details.
+
+### REST API and CLI Architectural Relationship
+
+The REST API and the CLI both rely on a common, [internal API](#internal-api).
+
+The CLI options are parsed by the
+[clap crate](https://docs.rs/clap/2.33.0/clap/) and then translated into
+[internal API](#internal-api) commands.
+
+The REST API is processed by an HTTP thread using the
+[Firecracker's `micro_http`](https://github.com/firecracker-microvm/firecracker/tree/master/src/micro_http)
+crate. As with the CLI, the HTTP requests eventually get translated into
+[internal API](#internal-api) commands.
+
+As a summary, the REST API and the CLI are essentially frontends for the
+[internal API](#internal-api):
+
+```
+                                  +------------------+
+                        REST API  |                  |
+                       +--------->+    micro_http    +--------+
+                       |          |                  |        |
+                       |          +------------------+        |
+                       |                                      |      +------------------------+
+                       |                                      |      |                        |
++------------+         |                                      |      |                        |
+|            |         |                                      |      | +--------------+       |
+|    User    +---------+                                      +------> | Internal API |       |
+|            |         |                                      |      | +--------------+       |
++------------+         |                                      |      |                        |
+                       |                                      |      |                        |
+                       |                                      |      +------------------------+
+                       |            +----------+              |                 VMM
+                       |     CLI    |          |              |
+                       +----------->+   clap   +--------------+
+                                    |          |
+                                    +----------+
+
+
+```
+
+## Internal API
+
+The Cloud Hypervisor internal API, as its name suggests, is used internally
+by the different Cloud Hypervisor threads (VMM, HTTP, control loop, etc) to
+send commands and responses to each others.
+
+It is based on [rust's Multi-Producer, Single-Consumer (MPSC)](https://doc.rust-lang.org/std/sync/mpsc/),
+and the single consumer (a.k.a. the API receiver) is the Cloud Hypervisor
+control loop.
+
+API producers are the HTTP thread handling the [REST API](#rest-api) and the
+main thread that initially parses the [CLI](#command-line-interface).
+
+### Goals and Design
+
+The internal API is designed for controlling, managing and inspecting a Cloud
+Hypervisor VMM and its guest. It is a backend for handling external, user
+visible requests through either the [REST API](#rest-api) or the
+[CLI](#command-line-interface) interfaces.
+
+The API follows a command-response scheme that closely maps the [REST API](#rest-api).
+Any command must be replied to with a response.
+
+Commands are [MPSC](https://doc.rust-lang.org/std/sync/mpsc/) based messages and
+are received and processed by the VMM control loop.
+
+In order for the VMM control loop to respond to any internal API command, it
+must be able to send a response back to the MPSC sender. For that purpose, all
+internal API command payload carry the [Sender](https://doc.rust-lang.org/std/sync/mpsc/struct.Sender.html)
+end of an [MPSC](https://doc.rust-lang.org/std/sync/mpsc/) channel. 
+
+The sender of any internal API command is therefore responsible for:
+
+1. Creating an [MPSC](https://doc.rust-lang.org/std/sync/mpsc/) response
+   channel.
+1. Passing the [Sender](https://doc.rust-lang.org/std/sync/mpsc/struct.Sender.html)
+   end of the response channel as part of the internal API command payload.
+1. Waiting for the internal API command's response on the [Receiver](https://doc.rust-lang.org/std/sync/mpsc/struct.Receiver.html)
+   end of the response channel.
+
+## End to End Example
+
+In order to further understand how the external and internal Cloud Hypervisor
+APIs work together, let's look at a complete VM creation flow, from the
+[REST API](#rest-api) call, to the reply the external user will receive:
+
+1. A user or operator sends an HTTP request to the Cloud Hypervisor
+   [REST API](#rest-api) in order to creates a virtual machine:
+   ```
+   shell
+   #!/bin/bash
+
+	curl --unix-socket /tmp/cloud-hypervisor.sock -i \
+		-X PUT 'http://localhost/api/v1/vm.create'  \
+		-H 'Accept: application/json'               \
+		-H 'Content-Type: application/json'         \
+		-d '{
+			"cpus":{"boot_vcpus": 4, "max_vcpus": 4},
+			"kernel":{"path":"/opt/clh/kernel/vmlinux-virtio-fs-virtio-iommu"},
+			"cmdline":{"args":"console=hvc0 reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda3"},
+			"disks":[{"path":"/opt/clh/images/clear-30080-kvm.img"}],
+			"rng":{"src":"/dev/urandom"},
+			"net":[{"ip":"192.168.10.10", "mask":"255.255.255.0", "mac":"12:34:56:78:90:01"}]
+			}'
+   ```
+1. The Cloud Hypervisor HTTP thread processes the request and de-serializes the
+   HTTP request JSON body into an internal `VmConfig` structure.
+1. The Cloud Hypervisor HTTP thread creates an
+   [MPSC](https://doc.rust-lang.org/std/sync/mpsc/) channel for the internal API
+   server to send its response back.
+1. The Cloud Hypervisor HTTP thread prepares an internal API command for creating a
+   virtual machine. The command's payload is made of the de-serialized
+   `VmConfig` structure and the response channel:
+   ```Rust
+   VmCreate(Arc<Mutex<VmConfig>>, Sender<ApiResponse>)
+   ```
+1. The Cloud Hypervisor HTTP thread sends the internal API command, and waits
+   for the response:
+   ```Rust
+   // Send the VM creation request.
+    api_sender
+        .send(ApiRequest::VmCreate(config, response_sender))
+        .map_err(ApiError::RequestSend)?;
+    api_evt.write(1).map_err(ApiError::EventFdWrite)?;
+
+    response_receiver.recv().map_err(ApiError::ResponseRecv)??;
+   ```
+1. The Cloud Hypervisor control loop receives the command, as it listens on the
+   internal API [MPSC](https://doc.rust-lang.org/std/sync/mpsc/) channel:
+   ```Rust
+   // Read from the API receiver channel
+   let api_request = api_receiver.recv().map_err(Error::ApiRequestRecv)?;
+   ```
+1. The Cloud Hypervisor control loop matches the received internal API against
+   the `VmCreate` payload, and extracts both the `VmConfig` structure and the
+   [Sender](https://doc.rust-lang.org/std/sync/mpsc/struct.Sender.html) from the
+   command payload. It stores the `VmConfig` structure and replies back to the
+   sender ((The HTTP thread):
+   ```Rust
+   match api_request {
+	   ApiRequest::VmCreate(config, sender) => {
+		   // We only store the passed VM config.
+		   // The VM will be created when being asked to boot it.
+		   let response = if self.vm_config.is_none() {
+			   self.vm_config = Some(config);
+			   Ok(ApiResponsePayload::Empty)
+		   } else {
+			   Err(ApiError::VmAlreadyCreated)
+		   };
+		   
+	       sender.send(response).map_err(Error::ApiResponseSend)?;
+	   }
+   ```
+1. The Cloud Hypervisor HTTP thread receives the internal API command response
+   as the return value from its `VmCreate` HTTP handler. Depending on the
+   control loop internal API response, it generates the appropriate HTTP
+   response:
+   ```Rust
+   // Call vm_create()
+   match vm_create(api_notifier, api_sender, Arc::new(Mutex::new(vm_config)))
+	   .map_err(HttpError::VmCreate)
+   {
+	   Ok(_) => Response::new(Version::Http11, StatusCode::NoContent),
+	   Err(e) => error_response(e, StatusCode::InternalServerError),
+   }
+   ```
+1. The Cloud Hypervisor HTTP thread sends the formed HTTP response back to the
+   user. This is abstracted by the
+   [micro_http](https://github.com/firecracker-microvm/firecracker/tree/master/src/micro_http)
+   crate.
+   

docs/custom-image.md

@@ -45,7 +45,7 @@ sudo swupd bundle-add os-installer
 wget https://download.clearlinux.org/current/config/image/cloudguest.yaml
 sed -i '/size: \"864M\"/d' cloudguest.yaml
 sed -i 's/\"800M\"/\"2G\"/g' cloudguest.yaml
-sed -i 's/bootloader,/bootloader,\n    iperf,/g' cloudguest.yaml
+sed -i 's/bootloader,/bootloader,\n    curl,\n    iperf,/g' cloudguest.yaml
 sed -i 's/systemd-networkd-autostart/sysadmin-basic,\n    systemd-networkd-autostart/g' cloudguest.yaml
 # Create the custom cloudguest image
 clr-installer -c cloudguest.yaml

docs/device_model.md

@@ -166,8 +166,8 @@ processes, we added support for vhost-user-blk backends. This enables
 `cloud-hypervisor` users to plug a `vhost-user` based block device (e.g. SPDK)
 into the VMM as their virtio block backend.
 
-This device is always built-in, and it is enabled based on the presence of the
+This device is always built-in, and it is enabled when `vhost_user=true` and
-flag `--vhost-user-blk`.
+`socket` are provided to the `--disk` parameter.
 
 ### vhost-user-fs
 
@@ -188,8 +188,8 @@ processes, we added support for [vhost-user-net](https://access.redhat.com/solut
 backends. This enables `cloud-hypervisor` users to plug a `vhost-user` based
 networking device (e.g. DPDK) into the VMM as their virtio network backend.
 
-This device is always built-in, and it is enabled based on the presence of the
+This device is always built-in, and it is enabled when `vhost_user=true` and
-flag `--vhost-user-net`.
+`socket` are provided to the `--net` parameter.
 
 ## VFIO
 

docs/fs.md

@@ -26,14 +26,14 @@ _Run virtiofsd_
 ```bash
 ./virtiofsd \
     -d \
-    -o vhost_user_socket=/tmp/virtiofs \
+    --socket-path=/tmp/virtiofs \
     -o source=/tmp/shared_dir \
-    -o cache=always
+    -o cache=none
 ```
 
-The `cache=always` option should be the default when using `virtiofsd` with the __cloud-hypervisor__ VMM. This allows the daemon to memory map the shared files, which gives better I/O performance.
+The `cache=none` option should be the default when using `virtiofsd` with the __cloud-hypervisor__ VMM. This prevents from using the guest page cache, which reduces the memory footprint of the guest. When running multiple virtual machines on the same host, this will let the host deal with page cache, which will increase the density of virtual machines which can be launched.
 
-The `cache=none` option is another way to run the daemon but because the _virtqueues_ are used to convey the files content in this case, the I/O performance is impacted.
+The `cache=always` option will allow for the guest page cache to be used, which will increase the memory footprint of the guest. This option should be used only for specific use cases where a single VM is going to be running on a host.
 
 ### The kernel
 
@@ -60,7 +60,7 @@ Assuming you have `clear-kvm.img` and `custom-vmlinux.bin` on your system, here
     --disk path=clear-kvm.img \
     --kernel custom-vmlinux.bin \
     --cmdline "console=ttyS0 reboot=k panic=1 nomodules root=/dev/vda3" \ 
-    --fs tag=virtiofs,sock=/tmp/virtiofs,num_queues=1,queue_size=512
+    --fs tag=myfs,sock=/tmp/virtiofs,num_queues=1,queue_size=512
 ```
 
 By default, DAX is enabled with a cache window of 8GiB. You can specify a custom size (let's say 4GiB for this example) for the cache by explicitly setting DAX and the cache size:
@@ -78,13 +78,11 @@ In case you don't want to use a shared window of cache to pass the shared files
 ```
 
 ### Mount the shared directory
-The last step is to mount the shared directory inside the guest, using the `virtio_fs` filesystem type.
+The last step is to mount the shared directory inside the guest, using the `virtiofs` filesystem type.
 ```bash
 mkdir mount_dir
-mount \
+mount -t virtiofs -o dax myfs mount_dir/
-    -t virtio_fs virtiofs mount_dir/ \
-    -o rootmode=040000,user_id=0,group_id=0,dax
 ```
-The `tag` needs to be consistent with what has been provided through the __cloud-hypervisor__ command line, which happens to be `virtiofs` in this example.
+The `tag` needs to be consistent with what has been provided through the __cloud-hypervisor__ command line, which happens to be `myfs` in this example.
 
-The `dax` option must be removed in case the shared cache region is not enabled from the VMM.
+The `-o dax` option must be removed in case the shared cache region is not enabled from the VMM.

docs/hotplug.md

@@ -11,10 +11,10 @@ This patch is integrated into the Clear Linux KVM and cloudguest images.
 
 ## CPU Hot Plug
 
-Extra vCPUs can be added (but not removed [1]) from a running Cloud Hypervisor instance. This is controlled by two mechanisms:
+Extra vCPUs can be added and removed from a running Cloud Hypervisor instance. This is controlled by two mechanisms:
 
 1. Specifying a number of maximum potential vCPUs that is greater than the number of default (boot) vCPUs.
-2. Making a HTTP API request to the VM to ask for the additional vCPUs to be added.
+2. Making a HTTP API request to the VMM to ask for the additional vCPUs to be added.
 
 To use CPU hotplug start the VM with the number of max vCPUs greater than the number of boot vCPUs, e.g.
 
@@ -40,7 +40,7 @@ To ask the VMM to add additional vCPUs then use the resize API:
 curl -H "Accept: application/json" -H "Content-Type: application/json" -i -XPUT --unix-socket /tmp/ch-socket -d "{ \"desired_vcpus\":8}" http://localhost/api/v1/vm.resize
 ```
 
-The extra vCPU threads will be created and advertised to the running kernel. The kernel does not bring up the CPUs immediately and instead the user must "on-line" them from inside the VM:
+The extra vCPU threads will be created and advertised to the running kernel. The kernel does not bring up the CPUs immediately and instead the user must "online" them from inside the VM:
 
 ```shell
 root@ch-guest ~ # lscpu | grep list:
@@ -54,4 +54,60 @@ On-line CPU(s) list:             0-7
 
 After a reboot the added CPUs will remain.
 
-[1]: It is not currently possible to remove CPUs after they are added however CPU hot unplug is included in our roadmap for a future version.
+Removing CPUs works similarly by reducing the number in the "desired_vcpus" field of the reisze API. The CPUs will be automatically offlined inside the guest so there is no need to run any commands inside the guest:
+
+```shell
+curl -H "Accept: application/json" -H "Content-Type: application/json" -i -XPUT --unix-socket /tmp/ch-socket -d "{ \"desired_vcpus\":2}" http://localhost/api/v1/vm.resize
+```
+
+As per adding CPUs to the guest, after a reboot the VM will be running with the reduced number of vCPUs.
+
+## Memory Hot Plug
+
+Extra memory can be added from a runing Cloud Hypervisor instance. This is controlled by two mechanisms:
+
+1. Allocating some of the guest physical address space for hotplug memory.
+2. Making a HTTP API request to the VMM to ask for a new amount of RAM to be assigned to the VM. In the case of expanding the memory for the VM the new memory will be hotplugged into the running VM, if reducing the size of the memory then change will take effect after the next reboot.
+
+To use memory hotplug start the VM specifying some size RAM in the "hotplug_size" parameter to the memory configuration. Not all the memory specified in this parameter will be available to hotplug as there are spacing and alignment requirements so it is recommended to make it larger than the hotplug RAM needed.
+
+```shell
+$ pushd $CLOUDH
+$ sudo setcap cap_net_admin+ep ./cloud-hypervisor/target/release/cloud-hypervisor
+$ ./cloud-hypervisor/target/release/cloud-hypervisor \
+	--kernel ./hypervisor-fw \
+	--disk path=clear-31890-kvm.img \
+	--cpus boot=4,max=8 \
+	--memory size=1024M,hotplug_size=8192M \
+	--net "tap=,mac=,ip=,mask=" \
+	--rng \
+    --api-socket=/tmp/ch-socket
+$ popd
+```
+
+Before issuing the API request it is necessary to run the following command inside the VM to make it automatically online the added memory:
+
+```shell
+root@ch-guest ~ # echo online | sudo tee /sys/devices/system/memory/auto_online_blocks
+```
+
+To ask the VMM to add expand the RAM for the VM  (request is in bytes):
+
+```shell
+curl -H "Accept: application/json" -H "Content-Type: application/json" -i -XPUT --unix-socket /tmp/ch-socket -d "{ \"desired_vcpus\": 4, \"desired_ram\" : 3221225472}" http://localhost/api/v1/vm.resize
+```
+
+The new memory is now available to use inside the VM:
+
+```shell
+free -h
+              total        used        free      shared  buff/cache   available
+Mem:          3.0Gi        71Mi       2.8Gi       0.0Ki        47Mi       2.8Gi
+Swap:          32Mi          0B        32Mi
+```
+
+Due to guest OS limitations is is necessary to ensure that amount of memory added (between currently assigned RAM and that which is desired) is a multiple of 128MiB.
+
+The same API can also be used to reduce the desired RAM for a VM but the change will not be applied until the VM is rebooted.
+
+Memory and CPU resizing can be combined together into the same HTTP API request.

docs/networking.md

@@ -2,6 +2,21 @@
 
 cloud-hypervisor can emulate one or more virtual network interfaces, represented at the hypervisor host by [tap devices](https://www.kernel.org/doc/Documentation/networking/tuntap.txt). This guide briefly describes, in a manual and distribution neutral way, how to setup and use networking with cloud-hypevisor.
 
+## Multiple queue support for net devices ##
+
+While multiple vcpus defined for guest, to gain the benefit of vcpu scalable to improve performance, it suggests to define multiple queue pairs for net devices, one Tx/Rx queue pair per one vcpu, that means the number of queue pairs at least is equal to the vcpu count. In that case, after virtnet driver set cpu affinity for virtqueues in guest kernel, vcpus could handle interrupt from different virtqueue pairs in parallel.
+
+It will gain better performance for guest that has multiple queues defined for net devices while it has multiple net sessions running in userspace.
+
+To enable multiple queue support in cloud-hypervisor, multiple queue pairs will be defined, while multiple tap fds will be opened for the same tap device, it will also have multiple threads started, each thread will monitor and handle the events from each virtqueue pairs and the associated tap fd.
+
+Note:
+
+- Currently, it does not support to use ethtool to change the combined queue numbers in guest.
+- Multiple queue is enabled for vhost-user-net backend in cloud-hypervisor, however, multiple thread is not added to handle mq, thus, the performance for vhost-user-net backend is not supposed to be improved. The multiple thread will be added for backend later.
+- Performance test for vhost-user-net will be covered once vhost-user-net backend has mulitple thread supported.
+- Performance test for virtio-net is done by comparing 2 queue pairs with 1 queue pairs, that to run 2 iperf3 sessions in the same test environments, throughput is improved about 37%.
+
 ## Start cloud-hypervisor with net devices
 
 Use one `--net` command-line argument from cloud-hypervisor to specify the emulation of one or more virtual NIC's. The example below instructs cloud-hypervisor to emulate for instance 2 virtual NIC's:
@@ -13,18 +28,34 @@ Use one `--net` command-line argument from cloud-hypervisor to specify the emula
     --disk path=my-root-disk.img \
     --kernel my-vmlinux.bin \
     --cmdline "console=ttyS0 reboot=k panic=1 nomodules root=/dev/vda3" \
-    --net tap=ich0,mac=a4:a1:c2:00:00:01,ip=192.168.4.2,mask=255.255.255.0 \
+    --net tap=ich0,mac=a4:a1:c2:00:00:01,ip=192.168.4.2,mask=255.255.255.0,num_queues=2,queue_size=256 \
-          tap=ich1,mac=a4:a1:c2:00:00:02,ip=10.0.1.2,mask=255.255.255.0
+          tap=ich1,mac=a4:a1:c2:00:00:02,ip=10.0.1.2,mask=255.255.255.0,num_queues=2,queue_size=256
 ```
- 
+
 The `--net` argument takes 1 or more space-separated strings of key value pairs containing the following 4 keys or fields:
 
-| Name     | Purpose                    | Optional  |
+| Name       | Purpose                    | Optional  |
-| -------- |----------------------------| ----------|
+| -----------|----------------------------| ----------|
-| tap      | tap device name            | Yes       |
+| tap        | tap device name            | Yes       |
-| mac      | vNIC mac address           | Yes       |
+| mac        | vNIC mac address           | Yes       |
-| ip       | tap IP IP address          | yes       |
+| ip         | tap IP IP address          | yes       |
-| mask     | tap IP netmask             | Yes       |
+| mask       | tap IP netmask             | Yes       |
+| num_queues | the number of queues       | yes       |
+| queue_size | the size of each queue     | Yes       |
+
+num_queues is the total number of tx and rx queues, the default value is 2, and it could be increased by multiples of 2. Additionally, num_queues is suggested to be as 2 times of vcpu count. The default value for queue_size is 256.
+
+If the tap device is pre-created on host before guest boot up. To use multiple queue support for net device in guest, the tap device should be opened like this from host.
+
+```bash
+[root@localhost ~]# ip tuntap add name ich0 mode tap multi_queue
+```
+
+And the `--net` device should specify support for multiple queues. `num_queues` must be a multiple of 2 starting at least from 4 since multiple queues really means multiple queue pairs. We need at least 2 pairs for this configuration to be correct:
+
+```bash
+--net tap=ich0,mac=a4:a1:c2:00:00:01,ip=192.168.4.2,mask=255.255.255.0,num_queues=4,queue_size=256
+```
 
 ## Configure the tap devices
 

docs/vhost-user-net-testing.md

@@ -0,0 +1,132 @@
+# How to test Vhost-user net with OpenVSwitch/DPDK
+
+The purpose of this document is to illustrate how to test vhost-user-net in cloud-hypervisor with OVS/DPDK as the backend.
+
+## Framework
+
+It's a simple test to validate the communication between two virtual machine, connecting them to vhost-user ports respectively provided by `OVS/DPDK`.
+```
+             +----+----------+          +-------------+-----------+-------------+          +----------+----+  
+             |    |          |          |             |           |             |          |          |    | 
+             |    |vhost-user|----------| vhost-user  |   ovs     | vhost-user  |----------|vhost-user|    |           
+             |    |net device|          | port 1      |           | port 2      |          |net device|    |           
+             |    |          |          |             |           |             |          |          |    |           
+             |    +----------+          +-------------+-----------+-------------+          +----------+    |           
+             |               |          |                                       |          |               |           
+             |vm1            |          |                  dpdk                 |          |           vm2 |           
+             |               |          |                                       |          |               |           
+          +--+---------------------------------------------------------------------------------------------+--+        
+          |  |                                       hugepages                                             |  |        
+          |  +---------------------------------------------------------------------------------------------+  |        
+          |                                                                                                   |        
+          |                                              host                                                 |        
+          |                                                                                                   |  
+          +---------------------------------------------------------------------------------------------------+        
+```
+## Prerequisites
+
+Prior to running the test, the following steps need to be performed.
+- Enable hugepages
+- Install DPDK
+- Install OVS
+
+Here are some good references for detailing them.
+- Red Hat
+	* https://wiki.qemu.org/Documentation/vhost-user-ovs-dpdk
+- Ubuntu server
+	* https://help.ubuntu.com/lts/serverguide/DPDK.html
+	* https://software.intel.com/en-us/articles/set-up-open-vswitch-with-dpdk-on-ubuntu-server
+
+## Test
+The test runs with multiple queue (MQ) support enabled, using 2 pairs of TX/RX queues defined for both OVS and the virtual machine. Here are the details on how the test can be run.
+
+_Setup OVS_
+
+`ovs_test.sh` is created to setup and start OVS. OVS will provide the `dpdkvhostuser` backend running in server mode.
+```bash
+mkdir -p /var/run/openvswitch
+modprobe openvswitch
+killall ovsdb-server ovs-vswitchd
+rm -f /var/run/openvswitch/vhost-user*
+rm -f /etc/openvswitch/conf.db
+export DB_SOCK=/var/run/openvswitch/db.sock
+ovsdb-tool create /etc/openvswitch/conf.db /usr/share/openvswitch/vswitch.ovsschema
+ovsdb-server --remote=punix:$DB_SOCK --remote=db:Open_vSwitch,Open_vSwitch,manager_options --pidfile --detach
+ovs-vsctl --no-wait init
+ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-lcore-mask=0xf
+ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-socket-mem=1024
+ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true
+ovs-vsctl --no-wait set Open_vSwitch . other_config:pmd-cpu-mask=0xf
+ovs-vswitchd unix:$DB_SOCK --pidfile --detach --log-file=/var/log/openvswitch/ovs-vswitchd.log
+ovs-vsctl add-br ovsbr0 -- set bridge ovsbr0 datapath_type=netdev
+ovs-vsctl add-port ovsbr0 vhost-user1 -- set Interface vhost-user1 type=dpdkvhostuser
+ovs-vsctl add-port ovsbr0 vhost-user2 -- set Interface vhost-user2 type=dpdkvhostuser
+ovs-vsctl set Interface vhost-user1 options:n_rxq=2
+ovs-vsctl set Interface vhost-user2 options:n_rxq=2
+```
+_Run ovs_test.sh_
+```bash
+./ovs_test.sh
+```
+
+_Launch the VMs_
+
+VMs run in client mode. They connect to the socket created by the `dpdkvhostuser` backend.
+```bash
+# From one terminal. We need to give the cloud-hypervisor binary the NET_ADMIN capabilities for it to set TAP interfaces up on the host.
+./cloud-hypervisor \
+        --cpus boot=2 \
+        --memory size=512M,file=/dev/hugepages   \
+        --kernel vmlinux \
+        --cmdline "reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda3" \
+        --disk path=clear-kvm.img   \
+        --net "mac=52:54:00:02:d9:01,vhost_user=true,socket=/var/run/openvswitch/vhost-user1,num_queues=4"
+
+# From another terminal. We need to give the cloud-hypervisor binary the NET_ADMIN capabilities for it to set TAP interfaces up on the host.
+./cloud-hypervisor \
+        --cpus boot=2 \
+        --memory size=512M,file=/dev/hugepages   \
+        --kernel vmlinux \
+        --cmdline "reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda3" \
+        --disk path=clear-kvm.img   \
+        --net "mac=52:54:20:11:C5:02,vhost_user=true,socket=/var/run/openvswitch/vhost-user2,num_queues=4"
+```
+
+_Setup VM1_
+```bash
+# From inside the guest
+sudo ip addr add 172.100.0.1/24 dev enp0s3
+```
+
+_Setup VM2_
+```bash
+# From inside the guest
+sudo ip addr add 172.100.0.2/24 dev enp0s3
+```
+
+_Ping VM1 from VM2_
+```bash
+# From inside the guest
+sudo ping 172.100.0.1
+```
+
+_Ping VM2 from VM1_
+```bash
+# From inside the guest
+sudo ping 172.100.0.2
+```
+
+__Result:__ At this point, VM1 and VM2 can ping each other successfully. We can now run `iperf3` test.
+
+_Run VM1 as server_
+```bash
+# From inside the guest
+iperf3 -s -p 4444
+```
+
+_Run VM2 as client_
+```bash
+# From inside the guest
+iperf3 -c 172.100.0.1 -t 30 -p 4444 &
+```
+

net_util/Cargo.toml

@@ -4,14 +4,14 @@ version = "0.1.0"
 authors = ["The Chromium OS Authors"]
 
 [dependencies]
-libc = "0.2.60"
+libc = "0.2.68"
-rand = "0.7.0"
+rand = "0.7.3"
-serde = "1.0.98"
+serde = "1.0.105"
 vmm-sys-util = ">=0.3.1"
 
 net_gen = { path = "../net_gen" }
 
 [dev-dependencies]
 lazy_static = "1.3.0"
-pnet = "0.22.0"
+pnet = "0.25.0"
-serde_json = "1.0.40"
+serde_json = "1.0.48"

net_util/src/mac.rs

@@ -7,6 +7,7 @@
 
 use rand::Rng;
 use std::fmt;
+use std::io;
 use std::result::Result;
 
 use serde::de::{Deserialize, Deserializer, Error};
@@ -20,23 +21,31 @@ pub struct MacAddr {
 }
 
 impl MacAddr {
-    // The error contains the str that failed to be parsed, for nicer error message generation.
+    pub fn parse_str<S>(s: &S) -> Result<MacAddr, io::Error>
-    pub fn parse_str<S>(s: &S) -> Result<MacAddr, &str>
     where
         S: AsRef<str> + ?Sized,
     {
         let v: Vec<&str> = s.as_ref().split(':').collect();
         let mut bytes = [0u8; MAC_ADDR_LEN];
+        let common_err = Err(io::Error::new(
+            io::ErrorKind::Other,
+            format!("parsing of {} into a MAC address failed", s.as_ref()),
+        ));
 
         if v.len() != MAC_ADDR_LEN {
-            return Err(s.as_ref());
+            return common_err;
         }
 
         for i in 0..MAC_ADDR_LEN {
             if v[i].len() != 2 {
-                return Err(s.as_ref());
+                return common_err;
             }
-            bytes[i] = u8::from_str_radix(v[i], 16).map_err(|_| s.as_ref())?;
+            bytes[i] = u8::from_str_radix(v[i], 16).map_err(|e| {
+                io::Error::new(
+                    io::ErrorKind::Other,
+                    format!("parsing of {} into a MAC address failed: {}", s.as_ref(), e),
+                )
+            })?;
         }
 
         Ok(MacAddr { bytes })
@@ -106,7 +115,8 @@ impl<'de> Deserialize<'de> for MacAddr {
         D: Deserializer<'de>,
     {
         let s = String::deserialize(deserializer)?;
-        MacAddr::parse_str(&s).map_err(|_| D::Error::custom("The provided MAC address is invalid."))
+        MacAddr::parse_str(&s)
+            .map_err(|e| D::Error::custom(format!("The provided MAC address is invalid: {}", e)))
     }
 }
 

net_util/src/tap.rs

@@ -20,8 +20,12 @@ use vmm_sys_util::ioctl::{ioctl_with_mut_ref, ioctl_with_ref, ioctl_with_val};
 pub enum Error {
     /// Couldn't open /dev/net/tun.
     OpenTun(IoError),
-    /// Unable to create tap interface.
+    /// Unable to configure tap interface.
-    CreateTap(IoError),
+    ConfigureTap(IoError),
+    /// Unable to retrieve features.
+    GetFeatures(IoError),
+    /// Missing multiqueue support in the kernel.
+    MultiQueueKernelSupport,
     /// ioctl failed.
     IoctlError(IoError),
     /// Failed to create a socket.
@@ -40,7 +44,7 @@ pub type Result<T> = ::std::result::Result<T, Error>;
 #[derive(Debug)]
 pub struct Tap {
     tap_file: File,
-    if_name: [u8; 16usize],
+    if_name: Vec<u8>,
 }
 
 impl PartialEq for Tap {
@@ -53,7 +57,7 @@ impl std::clone::Clone for Tap {
     fn clone(&self) -> Self {
         Tap {
             tap_file: self.tap_file.try_clone().unwrap(),
-            if_name: self.if_name,
+            if_name: self.if_name.clone(),
         }
     }
 }
@@ -78,7 +82,7 @@ fn build_terminated_if_name(if_name: &str) -> Result<Vec<u8>> {
 }
 
 impl Tap {
-    pub fn open_named(if_name: &str) -> Result<Tap> {
+    pub fn open_named(if_name: &str, num_queue_pairs: usize) -> Result<Tap> {
         let terminated_if_name = build_terminated_if_name(if_name)?;
 
         let fd = unsafe {
@@ -96,6 +100,20 @@ impl Tap {
         // We just checked that the fd is valid.
         let tuntap = unsafe { File::from_raw_fd(fd) };
 
+        // Let's validate some features before going any further.
+        // ioctl is safe since we call it with a valid tap fd and check the return
+        // value.
+        let mut features = 0;
+        let ret = unsafe { ioctl_with_mut_ref(&tuntap, net_gen::TUNGETFEATURES(), &mut features) };
+        if ret < 0 {
+            return Err(Error::GetFeatures(IoError::last_os_error()));
+        }
+
+        // Check if the user parameters match the kernel support for MQ
+        if (features & net_gen::IFF_MULTI_QUEUE == 0) && num_queue_pairs > 1 {
+            return Err(Error::MultiQueueKernelSupport);
+        }
+
         // This is pretty messy because of the unions used by ifreq. Since we
         // don't call as_mut on the same union field more than once, this block
         // is safe.
@@ -107,26 +125,31 @@ impl Tap {
             name_slice.copy_from_slice(terminated_if_name.as_slice());
             *ifru_flags =
                 (net_gen::IFF_TAP | net_gen::IFF_NO_PI | net_gen::IFF_VNET_HDR) as c_short;
+            if num_queue_pairs > 1 {
+                *ifru_flags |= net_gen::IFF_MULTI_QUEUE as c_short;
+            }
         }
 
         // ioctl is safe since we call it with a valid tap fd and check the return
         // value.
         let ret = unsafe { ioctl_with_mut_ref(&tuntap, net_gen::TUNSETIFF(), &mut ifreq) };
-
         if ret < 0 {
-            return Err(Error::CreateTap(IoError::last_os_error()));
+            return Err(Error::ConfigureTap(IoError::last_os_error()));
         }
 
+        let if_name_temp = unsafe { *ifreq.ifr_ifrn.ifrn_name.as_ref() };
+        let mut if_name = if_name_temp.to_vec();
+        if_name.truncate(terminated_if_name.len() - 1);
         // Safe since only the name is accessed, and it's cloned out.
         Ok(Tap {
             tap_file: tuntap,
-            if_name: unsafe { *ifreq.ifr_ifrn.ifrn_name.as_ref() },
+            if_name,
         })
     }
 
     /// Create a new tap interface.
-    pub fn new() -> Result<Tap> {
+    pub fn new(num_queue_pairs: usize) -> Result<Tap> {
-        Self::open_named("vmtap%d")
+        Self::open_named("vmtap%d", num_queue_pairs)
     }
 
     /// Set the host-side IP address for the tap interface.
@@ -232,11 +255,16 @@ impl Tap {
         // in a single-field union.
         unsafe {
             let ifrn_name = ifreq.ifr_ifrn.ifrn_name.as_mut();
-            ifrn_name.clone_from_slice(&self.if_name);
+            let name_slice = &mut ifrn_name[..self.if_name.len()];
+            name_slice.copy_from_slice(&self.if_name);
         }
 
         ifreq
     }
+
+    pub fn get_if_name(&self) -> Vec<u8> {
+        self.if_name.clone()
+    }
 }
 
 impl Read for Tap {
@@ -423,7 +451,7 @@ mod tests {
 
     #[test]
     fn test_tap_create() {
-        let t = Tap::new().unwrap();
+        let t = Tap::new(1).unwrap();
         println!("created tap: {:?}", t);
     }
 
@@ -435,7 +463,7 @@ mod tests {
         // the end of the function.
         let tap_ip_guard = TAP_IP_LOCK.lock().unwrap();
 
-        let tap = Tap::new().unwrap();
+        let tap = Tap::new(1).unwrap();
         let ip_addr: net::Ipv4Addr = (*tap_ip_guard).parse().unwrap();
         let netmask: net::Ipv4Addr = SUBNET_MASK.parse().unwrap();
 
@@ -448,21 +476,21 @@ mod tests {
     #[test]
     fn test_set_options() {
         // This line will fail to provide an initialized FD if the test is not run as root.
-        let tap = Tap::new().unwrap();
+        let tap = Tap::new(1).unwrap();
         tap.set_vnet_hdr_size(16).unwrap();
         tap.set_offload(0).unwrap();
     }
 
     #[test]
     fn test_tap_enable() {
-        let tap = Tap::new().unwrap();
+        let tap = Tap::new(1).unwrap();
         let ret = tap.enable();
         assert!(ret.is_ok());
     }
 
     #[test]
     fn test_tap_get_ifreq() {
-        let tap = Tap::new().unwrap();
+        let tap = Tap::new(1).unwrap();
         let ret = tap.get_ifreq();
         assert_eq!(
             "__BindgenUnionField",
@@ -472,7 +500,7 @@ mod tests {
 
     #[test]
     fn test_raw_fd() {
-        let tap = Tap::new().unwrap();
+        let tap = Tap::new(1).unwrap();
         assert_eq!(tap.as_raw_fd(), tap.tap_file.as_raw_fd());
     }
 
@@ -480,7 +508,7 @@ mod tests {
     fn test_read() {
         let tap_ip_guard = TAP_IP_LOCK.lock().unwrap();
 
-        let mut tap = Tap::new().unwrap();
+        let mut tap = Tap::new(1).unwrap();
         tap.set_ip_addr((*tap_ip_guard).parse().unwrap()).unwrap();
         tap.set_netmask(SUBNET_MASK.parse().unwrap()).unwrap();
         tap.enable().unwrap();
@@ -541,7 +569,7 @@ mod tests {
     fn test_write() {
         let tap_ip_guard = TAP_IP_LOCK.lock().unwrap();
 
-        let mut tap = Tap::new().unwrap();
+        let mut tap = Tap::new(1).unwrap();
         tap.set_ip_addr((*tap_ip_guard).parse().unwrap()).unwrap();
         tap.set_netmask(SUBNET_MASK.parse().unwrap()).unwrap();
         tap.enable().unwrap();

pci/Cargo.toml

@@ -6,9 +6,9 @@ edition = "2018"
 
 [dependencies]
 vm-allocator = { path = "../vm-allocator" }
-byteorder = "1.3.2"
+byteorder = "1.3.4"
 devices = { path = "../devices" }
-libc = "0.2.60"
+libc = "0.2.68"
 log = "0.4.8"
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+vm-device = { path = "../vm-device" }
-vmm-sys-util = ">=0.3.1"
+vm-memory = "0.1.0"

pci/src/bus.rs

@@ -10,12 +10,14 @@ use byteorder::{ByteOrder, LittleEndian};
 use devices::BusDevice;
 use std;
 use std::any::Any;
+use std::collections::HashMap;
 use std::ops::DerefMut;
-use std::sync::{Arc, Mutex, Weak};
+use std::sync::{Arc, Mutex};
 use vm_memory::{Address, GuestAddress, GuestUsize};
 
 const VENDOR_ID_INTEL: u16 = 0x8086;
 const DEVICE_ID_INTEL_VIRT_PCIE_HOST: u16 = 0x0d57;
+const NUM_DEVICE_IDS: usize = 32;
 
 /// Errors for device manager.
 #[derive(Debug)]
@@ -28,6 +30,10 @@ pub enum PciRootError {
     PioInsert(devices::BusError),
     /// Could not add a device to the mmio bus.
     MmioInsert(devices::BusError),
+    /// Could not find an available device slot on the PCI bus.
+    NoPciDeviceSlotAvailable,
+    /// Invalid PCI device identifier provided.
+    InvalidPciDeviceSlot(usize),
 }
 pub type Result<T> = std::result::Result<T, PciRootError>;
 
@@ -67,7 +73,7 @@ impl PciDevice for PciRoot {
         self.config.write_config_register(reg_idx, offset, data);
     }
 
-    fn read_config_register(&self, reg_idx: usize) -> u32 {
+    fn read_config_register(&mut self, reg_idx: usize) -> u32 {
         self.config.read_reg(reg_idx)
     }
 
@@ -79,19 +85,23 @@ impl PciDevice for PciRoot {
 pub struct PciBus {
     /// Devices attached to this bus.
     /// Device 0 is host bridge.
-    devices: Vec<Arc<Mutex<dyn PciDevice>>>,
+    devices: HashMap<u32, Arc<Mutex<dyn PciDevice>>>,
-    device_reloc: Weak<dyn DeviceRelocation>,
+    device_reloc: Arc<dyn DeviceRelocation>,
+    device_ids: Vec<bool>,
 }
 
 impl PciBus {
-    pub fn new(pci_root: PciRoot, device_reloc: Weak<dyn DeviceRelocation>) -> Self {
+    pub fn new(pci_root: PciRoot, device_reloc: Arc<dyn DeviceRelocation>) -> Self {
-        let mut devices: Vec<Arc<Mutex<dyn PciDevice>>> = Vec::new();
+        let mut devices: HashMap<u32, Arc<Mutex<dyn PciDevice>>> = HashMap::new();
+        let mut device_ids: Vec<bool> = vec![false; NUM_DEVICE_IDS];
 
-        devices.push(Arc::new(Mutex::new(pci_root)));
+        devices.insert(0, Arc::new(Mutex::new(pci_root)));
+        device_ids[0] = true;
 
         PciBus {
             devices,
             device_reloc,
+            device_ids,
         }
     }
 
@@ -119,13 +129,38 @@ impl PciBus {
         Ok(())
     }
 
-    pub fn add_device(&mut self, device: Arc<Mutex<dyn PciDevice>>) -> Result<()> {
+    pub fn add_device(
-        self.devices.push(device);
+        &mut self,
+        pci_device_bdf: u32,
+        device: Arc<Mutex<dyn PciDevice>>,
+    ) -> Result<()> {
+        self.devices.insert(pci_device_bdf >> 3, device);
         Ok(())
     }
 
-    pub fn next_device_id(&self) -> u32 {
+    pub fn remove_by_device(&mut self, device: &Arc<Mutex<dyn PciDevice>>) -> Result<()> {
-        self.devices.len() as u32
+        self.devices.retain(|_, dev| !Arc::ptr_eq(dev, device));
+        Ok(())
+    }
+
+    pub fn next_device_id(&mut self) -> Result<u32> {
+        for (idx, device_id) in self.device_ids.iter_mut().enumerate() {
+            if !(*device_id) {
+                *device_id = true;
+                return Ok(idx as u32);
+            }
+        }
+
+        Err(PciRootError::NoPciDeviceSlotAvailable)
+    }
+
+    pub fn put_device_id(&mut self, id: usize) -> Result<()> {
+        if id < NUM_DEVICE_IDS {
+            self.device_ids[id] = false;
+            Ok(())
+        } else {
+            Err(PciRootError::InvalidPciDeviceSlot(id))
+        }
     }
 }
 
@@ -150,7 +185,7 @@ impl PciConfigIo {
         }
 
         let (bus, device, function, register) =
-            parse_config_address(self.config_address & !0x8000_0000);
+            parse_io_config_address(self.config_address & !0x8000_0000);
 
         // Only support one bus.
         if bus != 0 {
@@ -166,7 +201,7 @@ impl PciConfigIo {
             .lock()
             .unwrap()
             .devices
-            .get(device)
+            .get(&(device as u32))
             .map_or(0xffff_ffff, |d| {
                 d.lock().unwrap().read_config_register(register)
             })
@@ -183,7 +218,7 @@ impl PciConfigIo {
         }
 
         let (bus, device, _function, register) =
-            parse_config_address(self.config_address & !0x8000_0000);
+            parse_io_config_address(self.config_address & !0x8000_0000);
 
         // Only support one bus.
         if bus != 0 {
@@ -191,13 +226,13 @@ impl PciConfigIo {
         }
 
         let pci_bus = self.pci_bus.lock().unwrap();
-        if let Some(d) = pci_bus.devices.get(device) {
+        if let Some(d) = pci_bus.devices.get(&(device as u32)) {
             let mut device = d.lock().unwrap();
 
             // Find out if one of the device's BAR is being reprogrammed, and
             // reprogram it if needed.
             if let Some(params) = device.detect_bar_reprogramming(register, data) {
-                if let Err(e) = pci_bus.device_reloc.upgrade().unwrap().move_bar(
+                if let Err(e) = pci_bus.device_reloc.move_bar(
                     params.old_base,
                     params.new_base,
                     params.len,
@@ -277,7 +312,7 @@ impl PciConfigMmio {
     }
 
     fn config_space_read(&self, config_address: u32) -> u32 {
-        let (bus, device, _function, register) = parse_config_address(config_address);
+        let (bus, device, _function, register) = parse_mmio_config_address(config_address);
 
         // Only support one bus.
         if bus != 0 {
@@ -288,7 +323,7 @@ impl PciConfigMmio {
             .lock()
             .unwrap()
             .devices
-            .get(device)
+            .get(&(device as u32))
             .map_or(0xffff_ffff, |d| {
                 d.lock().unwrap().read_config_register(register)
             })
@@ -299,7 +334,7 @@ impl PciConfigMmio {
             return;
         }
 
-        let (bus, device, _function, register) = parse_config_address(config_address);
+        let (bus, device, _function, register) = parse_mmio_config_address(config_address);
 
         // Only support one bus.
         if bus != 0 {
@@ -307,13 +342,13 @@ impl PciConfigMmio {
         }
 
         let pci_bus = self.pci_bus.lock().unwrap();
-        if let Some(d) = pci_bus.devices.get(device) {
+        if let Some(d) = pci_bus.devices.get(&(device as u32)) {
             let mut device = d.lock().unwrap();
 
             // Find out if one of the device's BAR is being reprogrammed, and
             // reprogram it if needed.
             if let Some(params) = device.detect_bar_reprogramming(register, data) {
-                if let Err(e) = pci_bus.device_reloc.upgrade().unwrap().move_bar(
+                if let Err(e) = pci_bus.device_reloc.move_bar(
                     params.old_base,
                     params.new_base,
                     params.len,
@@ -356,8 +391,33 @@ impl BusDevice for PciConfigMmio {
     }
 }
 
+fn shift_and_mask(value: u32, offset: usize, mask: u32) -> usize {
+    ((value >> offset) & mask) as usize
+}
+
+// Parse the MMIO address offset to a (bus, device, function, register) tuple.
+// See section 7.2.2 PCI Express Enhanced Configuration Access Mechanism (ECAM)
+// from the Pci Express Base Specification Revision 5.0 Version 1.0.
+fn parse_mmio_config_address(config_address: u32) -> (usize, usize, usize, usize) {
+    const BUS_NUMBER_OFFSET: usize = 20;
+    const BUS_NUMBER_MASK: u32 = 0x00ff;
+    const DEVICE_NUMBER_OFFSET: usize = 15;
+    const DEVICE_NUMBER_MASK: u32 = 0x1f;
+    const FUNCTION_NUMBER_OFFSET: usize = 12;
+    const FUNCTION_NUMBER_MASK: u32 = 0x07;
+    const REGISTER_NUMBER_OFFSET: usize = 2;
+    const REGISTER_NUMBER_MASK: u32 = 0x3ff;
+
+    (
+        shift_and_mask(config_address, BUS_NUMBER_OFFSET, BUS_NUMBER_MASK),
+        shift_and_mask(config_address, DEVICE_NUMBER_OFFSET, DEVICE_NUMBER_MASK),
+        shift_and_mask(config_address, FUNCTION_NUMBER_OFFSET, FUNCTION_NUMBER_MASK),
+        shift_and_mask(config_address, REGISTER_NUMBER_OFFSET, REGISTER_NUMBER_MASK),
+    )
+}
+
 // Parse the CONFIG_ADDRESS register to a (bus, device, function, register) tuple.
-fn parse_config_address(config_address: u32) -> (usize, usize, usize, usize) {
+fn parse_io_config_address(config_address: u32) -> (usize, usize, usize, usize) {
     const BUS_NUMBER_OFFSET: usize = 16;
     const BUS_NUMBER_MASK: u32 = 0x00ff;
     const DEVICE_NUMBER_OFFSET: usize = 11;
@@ -367,12 +427,10 @@ fn parse_config_address(config_address: u32) -> (usize, usize, usize, usize) {
     const REGISTER_NUMBER_OFFSET: usize = 2;
     const REGISTER_NUMBER_MASK: u32 = 0x3f;
 
-    let bus_number = ((config_address >> BUS_NUMBER_OFFSET) & BUS_NUMBER_MASK) as usize;
+    (
-    let device_number = ((config_address >> DEVICE_NUMBER_OFFSET) & DEVICE_NUMBER_MASK) as usize;
+        shift_and_mask(config_address, BUS_NUMBER_OFFSET, BUS_NUMBER_MASK),
-    let function_number =
+        shift_and_mask(config_address, DEVICE_NUMBER_OFFSET, DEVICE_NUMBER_MASK),
-        ((config_address >> FUNCTION_NUMBER_OFFSET) & FUNCTION_NUMBER_MASK) as usize;
+        shift_and_mask(config_address, FUNCTION_NUMBER_OFFSET, FUNCTION_NUMBER_MASK),
-    let register_number =
+        shift_and_mask(config_address, REGISTER_NUMBER_OFFSET, REGISTER_NUMBER_MASK),
-        ((config_address >> REGISTER_NUMBER_OFFSET) & REGISTER_NUMBER_MASK) as usize;
+    )
-
-    (bus_number, device_number, function_number, register_number)
 }

pci/src/configuration.rs

@@ -9,8 +9,8 @@ use crate::{MsixConfig, PciInterruptPin};
 use byteorder::{ByteOrder, LittleEndian};
 use std::fmt::{self, Display};
 
-// The number of 32bit registers in the config space, 256 bytes.
+// The number of 32bit registers in the config space, 4096 bytes.
-const NUM_CONFIGURATION_REGISTERS: usize = 64;
+const NUM_CONFIGURATION_REGISTERS: usize = 1024;
 
 const STATUS_REG: usize = 1;
 const STATUS_REG_CAPABILITIES_USED_MASK: u32 = 0x0010_0000;
@@ -399,12 +399,17 @@ impl PciConfiguration {
     pub fn write_reg(&mut self, reg_idx: usize, value: u32) {
         let mut mask = self.writable_bits[reg_idx];
 
-        if value == 0xffff_ffff {
+        if reg_idx >= BAR0_REG && reg_idx < BAR0_REG + NUM_BAR_REGS {
-            if reg_idx >= BAR0_REG && reg_idx < BAR0_REG + NUM_BAR_REGS {
+            // Handle very specific case where the BAR is being written with
-                // Handle very specific case where the BAR is being written with
+            // all 1's to retrieve the BAR size during next BAR reading.
-                // all 1's to retrieve the BAR size on next BAR reading.
+            if value == 0xffff_ffff {
                 mask = self.bar_size[reg_idx - 4];
-            } else if reg_idx == ROM_BAR_REG {
+            }
+        } else if reg_idx == ROM_BAR_REG {
+            // Handle very specific case where the BAR is being written with
+            // all 1's on bits 31-11 to retrieve the BAR size during next BAR
+            // reading.
+            if value & ROM_BAR_ADDR_MASK == ROM_BAR_ADDR_MASK {
                 mask = self.rom_bar_size;
             }
         }
@@ -669,10 +674,6 @@ impl PciConfiguration {
 
         let value = LittleEndian::read_u32(data);
 
-        if value == 0xffff_ffff {
-            return None;
-        }
-
         let mask = self.writable_bits[reg_idx];
         if reg_idx >= BAR0_REG && reg_idx < BAR0_REG + NUM_BAR_REGS {
             let bar_idx = reg_idx - 4;
@@ -684,6 +685,12 @@ impl PciConfiguration {
                     match bar_type {
                         PciBarRegionType::Memory64BitRegion => {}
                         _ => {
+                            // Ignore the case where the BAR size is being
+                            // asked for.
+                            if value == 0xffff_ffff {
+                                return None;
+                            }
+
                             debug!(
                                 "DETECT BAR REPROG: current 0x{:x}, new 0x{:x}",
                                 self.registers[reg_idx], value
@@ -707,6 +714,17 @@ impl PciConfiguration {
                     && (self.registers[reg_idx - 1] & self.writable_bits[reg_idx - 1])
                         != (self.bar_addr[bar_idx - 1] & self.writable_bits[reg_idx - 1])
                 {
+                    // Ignore the case where the BAR size is being asked for.
+                    // Because we are in the 64bits case here, we have to check
+                    // if the lower 32bits of the current BAR have already been
+                    // asked for the BAR size too.
+                    if value == 0xffff_ffff
+                        && self.registers[reg_idx - 1] & self.writable_bits[reg_idx - 1]
+                            == self.bar_size[bar_idx - 1] & self.writable_bits[reg_idx - 1]
+                    {
+                        return None;
+                    }
+
                     debug!(
                         "DETECT BAR REPROG: current 0x{:x}, new 0x{:x}",
                         self.registers[reg_idx], value
@@ -731,6 +749,11 @@ impl PciConfiguration {
                 }
             }
         } else if reg_idx == ROM_BAR_REG && (value & mask) != (self.rom_bar_addr & mask) {
+            // Ignore the case where the BAR size is being asked for.
+            if value & ROM_BAR_ADDR_MASK == ROM_BAR_ADDR_MASK {
+                return None;
+            }
+
             debug!(
                 "DETECT ROM BAR REPROG: current 0x{:x}, new 0x{:x}",
                 self.registers[reg_idx], value

pci/src/device.rs

@@ -3,23 +3,13 @@
 // found in the LICENSE-BSD-3-Clause file.
 
 use crate::configuration::{self, PciBarRegionType};
-use crate::msix::MsixTableEntry;
-use crate::PciInterruptPin;
 use devices::BusDevice;
 use std::any::Any;
 use std::fmt::{self, Display};
-use std::sync::Arc;
 use std::{self, io, result};
 use vm_allocator::SystemAllocator;
 use vm_memory::{GuestAddress, GuestUsize};
 
-pub struct InterruptParameters<'a> {
-    pub msix: Option<&'a MsixTableEntry>,
-}
-
-pub type InterruptDelivery =
-    Box<dyn Fn(InterruptParameters) -> result::Result<(), io::Error> + Send + Sync>;
-
 #[derive(Debug)]
 pub enum Error {
     /// Setup of the device capabilities failed.
@@ -56,19 +46,6 @@ pub struct BarReprogrammingParams {
 }
 
 pub trait PciDevice: BusDevice {
-    /// Assign a legacy PCI IRQ to this device.
-    /// The device may write to `irq_evt` to trigger an interrupt.
-    fn assign_pin_irq(
-        &mut self,
-        _irq_cb: Arc<InterruptDelivery>,
-        _irq_num: u32,
-        _irq_pin: PciInterruptPin,
-    ) {
-    }
-
-    /// Assign MSI-X to this device.
-    fn assign_msix(&mut self, _msi_cb: Arc<InterruptDelivery>) {}
-
     /// Allocates the needed PCI BARs space using the `allocate` function which takes a size and
     /// returns an address. Returns a Vec of (GuestAddress, GuestUsize) tuples.
     fn allocate_bars(
@@ -78,13 +55,18 @@ pub trait PciDevice: BusDevice {
         Ok(Vec::new())
     }
 
+    /// Frees the PCI BARs previously allocated with a call to allocate_bars().
+    fn free_bars(&mut self, _allocator: &mut SystemAllocator) -> Result<()> {
+        Ok(())
+    }
+
     /// Sets a register in the configuration space.
     /// * `reg_idx` - The index of the config register to modify.
     /// * `offset` - Offset in to the register.
     fn write_config_register(&mut self, reg_idx: usize, offset: u64, data: &[u8]);
     /// Gets a register from the configuration space.
     /// * `reg_idx` - The index of the config register to read.
-    fn read_config_register(&self, reg_idx: usize) -> u32;
+    fn read_config_register(&mut self, reg_idx: usize) -> u32;
     /// Detects if a BAR is being reprogrammed.
     fn detect_bar_reprogramming(
         &mut self,

pci/src/lib.rs

@@ -7,7 +7,6 @@
 extern crate log;
 extern crate devices;
 extern crate vm_memory;
-extern crate vmm_sys_util;
 
 mod bus;
 mod configuration;
@@ -22,10 +21,9 @@ pub use self::configuration::{
     PciNetworkControllerSubclass, PciProgrammingInterface, PciSerialBusSubClass, PciSubclass,
 };
 pub use self::device::{
-    BarReprogrammingParams, DeviceRelocation, Error as PciDeviceError, InterruptDelivery,
+    BarReprogrammingParams, DeviceRelocation, Error as PciDeviceError, PciDevice,
-    InterruptParameters, PciDevice,
 };
-pub use self::msi::MsiCap;
+pub use self::msi::{msi_num_enabled_vectors, MsiCap, MsiConfig};
 pub use self::msix::{MsixCap, MsixConfig, MsixTableEntry, MSIX_TABLE_ENTRY_SIZE};
 
 /// PCI has four interrupt pins A->D.

pci/src/msi.rs

@@ -7,6 +7,10 @@ extern crate byteorder;
 extern crate vm_memory;
 
 use byteorder::{ByteOrder, LittleEndian};
+use std::sync::Arc;
+use vm_device::interrupt::{
+    InterruptIndex, InterruptSourceConfig, InterruptSourceGroup, MsiIrqSourceConfig,
+};
 
 // MSI control masks
 const MSI_CTL_ENABLE: u16 = 0x1;
@@ -21,6 +25,16 @@ const MSI_MSG_ADDR_LO_OFFSET: u64 = 0x4;
 // MSI message masks
 const MSI_MSG_ADDR_LO_MASK: u32 = 0xffff_fffc;
 
+pub fn msi_num_enabled_vectors(msg_ctl: u16) -> usize {
+    let field = (msg_ctl >> 4) & 0x7;
+
+    if field > 5 {
+        return 0;
+    }
+
+    1 << field
+}
+
 #[derive(Clone, Copy, Default)]
 pub struct MsiCap {
     // Message Control Register
@@ -58,21 +72,15 @@ impl MsiCap {
         self.msg_ctl & MSI_CTL_PER_VECTOR == MSI_CTL_PER_VECTOR
     }
 
-    pub fn enabled(&self) -> bool {
+    fn enabled(&self) -> bool {
         self.msg_ctl & MSI_CTL_ENABLE == MSI_CTL_ENABLE
     }
 
-    pub fn num_enabled_vectors(&self) -> usize {
+    fn num_enabled_vectors(&self) -> usize {
-        let field = (self.msg_ctl >> 4) & 0x7;
+        msi_num_enabled_vectors(self.msg_ctl)
-
-        if field > 5 {
-            return 0;
-        }
-
-        1 << field
     }
 
-    pub fn vector_masked(&self, vector: usize) -> bool {
+    fn vector_masked(&self, vector: usize) -> bool {
         if !self.per_vector_mask() {
             return false;
         }
@@ -80,7 +88,7 @@ impl MsiCap {
         (self.mask_bits >> vector) & 0x1 == 0x1
     }
 
-    pub fn size(&self) -> u64 {
+    fn size(&self) -> u64 {
         let mut size: u64 = 0xa;
 
         if self.addr_64_bits() {
@@ -93,7 +101,7 @@ impl MsiCap {
         size
     }
 
-    pub fn update(&mut self, offset: u64, data: &[u8]) {
+    fn update(&mut self, offset: u64, data: &[u8]) {
         // Calculate message data offset depending on the address being 32 or
         // 64 bits.
         // Calculate upper address offset if the address is 64 bits.
@@ -151,3 +159,75 @@ impl MsiCap {
         }
     }
 }
+
+pub struct MsiConfig {
+    cap: MsiCap,
+    interrupt_source_group: Arc<Box<dyn InterruptSourceGroup>>,
+}
+
+impl MsiConfig {
+    pub fn new(msg_ctl: u16, interrupt_source_group: Arc<Box<dyn InterruptSourceGroup>>) -> Self {
+        let cap = MsiCap {
+            msg_ctl,
+            ..Default::default()
+        };
+
+        MsiConfig {
+            cap,
+            interrupt_source_group,
+        }
+    }
+
+    pub fn enabled(&self) -> bool {
+        self.cap.enabled()
+    }
+
+    pub fn size(&self) -> u64 {
+        self.cap.size()
+    }
+
+    pub fn num_enabled_vectors(&self) -> usize {
+        self.cap.num_enabled_vectors()
+    }
+
+    pub fn update(&mut self, offset: u64, data: &[u8]) {
+        let old_enabled = self.cap.enabled();
+
+        self.cap.update(offset, data);
+
+        if self.cap.enabled() {
+            for idx in 0..self.num_enabled_vectors() {
+                let config = MsiIrqSourceConfig {
+                    high_addr: self.cap.msg_addr_hi,
+                    low_addr: self.cap.msg_addr_lo,
+                    data: self.cap.msg_data as u32,
+                };
+
+                if let Err(e) = self
+                    .interrupt_source_group
+                    .update(idx as InterruptIndex, InterruptSourceConfig::MsiIrq(config))
+                {
+                    error!("Failed updating vector: {:?}", e);
+                }
+
+                if self.cap.vector_masked(idx) {
+                    if let Err(e) = self.interrupt_source_group.mask(idx as InterruptIndex) {
+                        error!("Failed masking vector: {:?}", e);
+                    }
+                } else if let Err(e) = self.interrupt_source_group.unmask(idx as InterruptIndex) {
+                    error!("Failed unmasking vector: {:?}", e);
+                }
+            }
+
+            if !old_enabled {
+                if let Err(e) = self.interrupt_source_group.enable() {
+                    error!("Failed enabling irq_fd: {:?}", e);
+                }
+            }
+        } else if old_enabled {
+            if let Err(e) = self.interrupt_source_group.disable() {
+                error!("Failed disabling irq_fd: {:?}", e);
+            }
+        }
+    }
+}

pci/src/msix.rs

@@ -8,9 +8,11 @@ extern crate vm_memory;
 
 use std::sync::Arc;
 
-use crate::device::InterruptParameters;
+use crate::{PciCapability, PciCapabilityID};
-use crate::{InterruptDelivery, PciCapability, PciCapabilityID};
 use byteorder::{ByteOrder, LittleEndian};
+use vm_device::interrupt::{
+    InterruptIndex, InterruptSourceConfig, InterruptSourceGroup, MsiIrqSourceConfig,
+};
 use vm_memory::ByteValued;
 
 const MAX_MSIX_VECTORS_PER_DEVICE: u16 = 2048;
@@ -51,13 +53,16 @@ impl Default for MsixTableEntry {
 pub struct MsixConfig {
     pub table_entries: Vec<MsixTableEntry>,
     pub pba_entries: Vec<u64>,
-    interrupt_cb: Option<Arc<InterruptDelivery>>,
+    interrupt_source_group: Arc<Box<dyn InterruptSourceGroup>>,
     masked: bool,
     enabled: bool,
 }
 
 impl MsixConfig {
-    pub fn new(msix_vectors: u16) -> Self {
+    pub fn new(
+        msix_vectors: u16,
+        interrupt_source_group: Arc<Box<dyn InterruptSourceGroup>>,
+    ) -> Self {
         assert!(msix_vectors <= MAX_MSIX_VECTORS_PER_DEVICE);
 
         let mut table_entries: Vec<MsixTableEntry> = Vec::new();
@@ -69,16 +74,12 @@ impl MsixConfig {
         MsixConfig {
             table_entries,
             pba_entries,
-            interrupt_cb: None,
+            interrupt_source_group,
             masked: false,
             enabled: false,
         }
     }
 
-    pub fn register_interrupt_cb(&mut self, cb: Arc<InterruptDelivery>) {
-        self.interrupt_cb = Some(cb);
-    }
-
     pub fn masked(&self) -> bool {
         self.masked
     }
@@ -89,10 +90,50 @@ impl MsixConfig {
 
     pub fn set_msg_ctl(&mut self, reg: u16) {
         let old_masked = self.masked;
+        let old_enabled = self.enabled;
 
         self.masked = ((reg >> FUNCTION_MASK_BIT) & 1u16) == 1u16;
         self.enabled = ((reg >> MSIX_ENABLE_BIT) & 1u16) == 1u16;
 
+        // Update KVM routes
+        if old_masked != self.masked || old_enabled != self.enabled {
+            if self.enabled && !self.masked {
+                for (idx, table_entry) in self.table_entries.iter().enumerate() {
+                    let config = MsiIrqSourceConfig {
+                        high_addr: table_entry.msg_addr_hi,
+                        low_addr: table_entry.msg_addr_lo,
+                        data: table_entry.msg_data,
+                    };
+
+                    if let Err(e) = self
+                        .interrupt_source_group
+                        .update(idx as InterruptIndex, InterruptSourceConfig::MsiIrq(config))
+                    {
+                        error!("Failed updating vector: {:?}", e);
+                    }
+
+                    if table_entry.masked() {
+                        if let Err(e) = self.interrupt_source_group.mask(idx as InterruptIndex) {
+                            error!("Failed masking vector: {:?}", e);
+                        }
+                    } else if let Err(e) = self.interrupt_source_group.unmask(idx as InterruptIndex)
+                    {
+                        error!("Failed unmasking vector: {:?}", e);
+                    }
+                }
+
+                if !old_enabled || old_masked {
+                    if let Err(e) = self.interrupt_source_group.enable() {
+                        error!("Failed enabling irq_fd: {:?}", e);
+                    }
+                }
+            } else if old_enabled || !old_masked {
+                if let Err(e) = self.interrupt_source_group.disable() {
+                    error!("Failed disabling irq_fd: {:?}", e);
+                }
+            }
+        }
+
         // If the Function Mask bit was set, and has just been cleared, it's
         // important to go through the entire PBA to check if there was any
         // pending MSI-X message to inject, given that the vector is not
@@ -198,6 +239,32 @@ impl MsixConfig {
             _ => error!("invalid data length"),
         };
 
+        // Update interrupt routes
+        if self.enabled && !self.masked {
+            let table_entry = &self.table_entries[index];
+
+            let config = MsiIrqSourceConfig {
+                high_addr: table_entry.msg_addr_hi,
+                low_addr: table_entry.msg_addr_lo,
+                data: table_entry.msg_data,
+            };
+
+            if let Err(e) = self.interrupt_source_group.update(
+                index as InterruptIndex,
+                InterruptSourceConfig::MsiIrq(config),
+            ) {
+                error!("Failed updating vector: {:?}", e);
+            }
+
+            if table_entry.masked() {
+                if let Err(e) = self.interrupt_source_group.mask(index as InterruptIndex) {
+                    error!("Failed masking vector: {:?}", e);
+                }
+            } else if let Err(e) = self.interrupt_source_group.unmask(index as InterruptIndex) {
+                error!("Failed unmasking vector: {:?}", e);
+            }
+        }
+
         // After the MSI-X table entry has been updated, it is necessary to
         // check if the vector control masking bit has changed. In case the
         // bit has been flipped from 1 to 0, we need to inject a MSI message
@@ -285,13 +352,12 @@ impl MsixConfig {
 
     fn inject_msix_and_clear_pba(&mut self, vector: usize) {
         // Inject the MSI message
-        if let Some(cb) = &self.interrupt_cb {
+        match self
-            match (cb)(InterruptParameters {
+            .interrupt_source_group
-                msix: Some(&self.table_entries[vector]),
+            .trigger(vector as InterruptIndex)
-            }) {
+        {
-                Ok(_) => debug!("MSI-X injected on vector control flip"),
+            Ok(_) => debug!("MSI-X injected on vector control flip"),
-                Err(e) => error!("failed to inject MSI-X: {}", e),
+            Err(e) => error!("failed to inject MSI-X: {}", e),
-            };
         }
 
         // Clear the bit from PBA

qcow/Cargo.toml

@@ -9,11 +9,12 @@ license = "BSD-3-Clause"
 path = "src/qcow.rs"
 
 [dependencies]
-byteorder = "1.3.2"
+byteorder = "1.3.4"
-libc = "0.2.60"
+libc = "0.2.68"
 log = "0.4.8"
-remain = "0.1.3"
+remain = "0.2.1"
 vmm-sys-util = ">=0.3.1"
+vm-virtio = { path = "../vm-virtio" }
 
 [dev-dependencies]
 tempfile = "3.1.0"

qcow/src/qcow.rs

@@ -12,6 +12,7 @@ mod vec_cache;
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
 use libc::{EINVAL, ENOSPC, ENOTSUP};
 use remain::sorted;
+use vm_virtio::RawFile;
 use vmm_sys_util::{
     file_traits::FileSetLen, file_traits::FileSync, seek_hole::SeekHole, write_zeroes::PunchHole,
     write_zeroes::WriteZeroes,
@@ -19,10 +20,8 @@ use vmm_sys_util::{
 
 use std::cmp::{max, min};
 use std::fmt::{self, Display};
-use std::fs::File;
 use std::io::{self, Read, Seek, SeekFrom, Write};
 use std::mem::size_of;
-use std::os::unix::io::{AsRawFd, RawFd};
 
 use crate::qcow_raw_file::QcowRawFile;
 use crate::refcount::RefCount;
@@ -190,7 +189,7 @@ pub struct QcowHeader {
 
 impl QcowHeader {
     /// Creates a QcowHeader from a reference to a file.
-    pub fn new(f: &mut File) -> Result<QcowHeader> {
+    pub fn new(f: &mut RawFile) -> Result<QcowHeader> {
         f.seek(SeekFrom::Start(0)).map_err(Error::ReadingHeader)?;
         let magic = f.read_u32::<BigEndian>().map_err(Error::ReadingHeader)?;
         if magic != QCOW_MAGIC {
@@ -198,12 +197,12 @@ impl QcowHeader {
         }
 
         // Reads the next u32 from the file.
-        fn read_u32_from_file(f: &mut File) -> Result<u32> {
+        fn read_u32_from_file(f: &mut RawFile) -> Result<u32> {
             f.read_u32::<BigEndian>().map_err(Error::ReadingHeader)
         }
 
         // Reads the next u64 from the file.
-        fn read_u64_from_file(f: &mut File) -> Result<u64> {
+        fn read_u64_from_file(f: &mut RawFile) -> Result<u64> {
             f.read_u64::<BigEndian>().map_err(Error::ReadingHeader)
         }
 
@@ -368,9 +367,11 @@ fn max_refcount_clusters(refcount_order: u32, cluster_size: u32, num_clusters: u
 ///
 /// ```
 /// # use std::io::{Read, Seek, SeekFrom};
+/// # use vm_virtio::RawFile;
 /// # use qcow::{self, QcowFile};
 /// # fn test(file: std::fs::File) -> std::io::Result<()> {
-///     let mut q = QcowFile::from(file).expect("Can't open qcow file");
+///     let mut raw_img = RawFile::new(file, false);
+///     let mut q = QcowFile::from(raw_img).expect("Can't open qcow file");
 ///     let mut buf = [0u8; 12];
 ///     q.seek(SeekFrom::Start(10 as u64))?;
 ///     q.read(&mut buf[..])?;
@@ -395,7 +396,7 @@ pub struct QcowFile {
 
 impl QcowFile {
     /// Creates a QcowFile from `file`. File must be a valid qcow2 image.
-    pub fn from(mut file: File) -> Result<QcowFile> {
+    pub fn from(mut file: RawFile) -> Result<QcowFile> {
         let header = QcowHeader::new(&mut file)?;
 
         // Only v2 and v3 files are supported.
@@ -544,7 +545,7 @@ impl QcowFile {
     }
 
     /// Creates a new QcowFile at the given path.
-    pub fn new(mut file: File, version: u32, virtual_size: u64) -> Result<QcowFile> {
+    pub fn new(mut file: RawFile, version: u32, virtual_size: u64) -> Result<QcowFile> {
         let header = QcowHeader::create_for_size(version, virtual_size);
         file.seek(SeekFrom::Start(0)).map_err(Error::SeekingFile)?;
         header.write_to(&mut file)?;
@@ -1220,7 +1221,12 @@ impl QcowFile {
         let refcount = self
             .refcounts
             .get_cluster_refcount(&mut self.raw_file, cluster_addr)
-            .map_err(|_| std::io::Error::from_raw_os_error(EINVAL))?;
+            .map_err(|e| {
+                io::Error::new(
+                    io::ErrorKind::InvalidData,
+                    format!("failed to get cluster refcount: {}", e),
+                )
+            })?;
         if refcount == 0 {
             return Err(std::io::Error::from_raw_os_error(EINVAL));
         }
@@ -1394,12 +1400,6 @@ impl Drop for QcowFile {
     }
 }
 
-impl AsRawFd for QcowFile {
-    fn as_raw_fd(&self) -> RawFd {
-        self.raw_file.file().as_raw_fd()
-    }
-}
-
 impl Read for QcowFile {
     fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
         let address: u64 = self.current_offset as u64;
@@ -1634,7 +1634,7 @@ where
     Ok(())
 }
 
-fn convert_reader<R>(reader: &mut R, dst_file: File, dst_type: ImageType) -> Result<()>
+fn convert_reader<R>(reader: &mut R, dst_file: RawFile, dst_type: ImageType) -> Result<()>
 where
     R: Read + Seek + SeekHole,
 {
@@ -1666,8 +1666,8 @@ where
 /// Copy the contents of a disk image in `src_file` into `dst_file`.
 /// The type of `src_file` is automatically detected, and the output file type is
 /// determined by `dst_type`.
-pub fn convert(src_file: File, dst_file: File, dst_type: ImageType) -> Result<()> {
+pub fn convert(mut src_file: RawFile, dst_file: RawFile, dst_type: ImageType) -> Result<()> {
-    let src_type = detect_image_type(&src_file)?;
+    let src_type = detect_image_type(&mut src_file)?;
     match src_type {
         ImageType::Qcow2 => {
             let mut src_reader = QcowFile::from(src_file)?;
@@ -1682,17 +1682,18 @@ pub fn convert(src_file: File, dst_file: File, dst_type: ImageType) -> Result<()
 }
 
 /// Detect the type of an image file by checking for a valid qcow2 header.
-pub fn detect_image_type(file: &File) -> Result<ImageType> {
+pub fn detect_image_type(file: &mut RawFile) -> Result<ImageType> {
-    let mut f = file;
+    let orig_seek = file
-    let orig_seek = f.seek(SeekFrom::Current(0)).map_err(Error::SeekingFile)?;
+        .seek(SeekFrom::Current(0))
-    f.seek(SeekFrom::Start(0)).map_err(Error::SeekingFile)?;
+        .map_err(Error::SeekingFile)?;
-    let magic = f.read_u32::<BigEndian>().map_err(Error::ReadingHeader)?;
+    file.seek(SeekFrom::Start(0)).map_err(Error::SeekingFile)?;
+    let magic = file.read_u32::<BigEndian>().map_err(Error::ReadingHeader)?;
     let image_type = if magic == QCOW_MAGIC {
         ImageType::Qcow2
     } else {
         ImageType::Raw
     };
-    f.seek(SeekFrom::Start(orig_seek))
+    file.seek(SeekFrom::Start(orig_seek))
         .map_err(Error::SeekingFile)?;
     Ok(image_type)
 }
@@ -1700,9 +1701,9 @@ pub fn detect_image_type(file: &File) -> Result<ImageType> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use std::fs::File;
     use std::io::{Read, Seek, SeekFrom, Write};
     use tempfile::tempfile;
+    use vm_virtio::RawFile;
 
     fn valid_header_v3() -> Vec<u8> {
         vec![
@@ -1771,9 +1772,9 @@ mod tests {
 
     fn with_basic_file<F>(header: &[u8], mut testfn: F)
     where
-        F: FnMut(File),
+        F: FnMut(RawFile),
     {
-        let mut disk_file: File = tempfile().unwrap();
+        let mut disk_file: RawFile = RawFile::new(tempfile().unwrap(), false);
         disk_file.write_all(&header).unwrap();
         disk_file.set_len(0x1_0000_0000).unwrap();
         disk_file.seek(SeekFrom::Start(0)).unwrap();
@@ -1781,11 +1782,11 @@ mod tests {
         testfn(disk_file); // File closed when the function exits.
     }
 
-    fn with_default_file<F>(file_size: u64, mut testfn: F)
+    fn with_default_file<F>(file_size: u64, direct: bool, mut testfn: F)
     where
         F: FnMut(QcowFile),
     {
-        let tmp = tempfile().unwrap();
+        let tmp: RawFile = RawFile::new(tempfile().unwrap(), direct);
         let qcow_file = QcowFile::new(tmp, 3, file_size).unwrap();
 
         testfn(qcow_file); // File closed when the function exits.
@@ -1794,7 +1795,7 @@ mod tests {
     #[test]
     fn default_header_v2() {
         let header = QcowHeader::create_for_size(2, 0x10_0000);
-        let mut disk_file: File = tempfile().unwrap();
+        let mut disk_file: RawFile = RawFile::new(tempfile().unwrap(), false);
         header
             .write_to(&mut disk_file)
             .expect("Failed to write header to temporary file.");
@@ -1805,7 +1806,7 @@ mod tests {
     #[test]
     fn default_header_v3() {
         let header = QcowHeader::create_for_size(3, 0x10_0000);
-        let mut disk_file: File = tempfile().unwrap();
+        let mut disk_file: RawFile = RawFile::new(tempfile().unwrap(), false);
         header
             .write_to(&mut disk_file)
             .expect("Failed to write header to temporary file.");
@@ -1815,13 +1816,13 @@ mod tests {
 
     #[test]
     fn header_read() {
-        with_basic_file(&valid_header_v2(), |mut disk_file: File| {
+        with_basic_file(&valid_header_v2(), |mut disk_file: RawFile| {
             let header = QcowHeader::new(&mut disk_file).expect("Failed to create Header.");
             assert_eq!(header.version, 2);
             assert_eq!(header.refcount_order, DEFAULT_REFCOUNT_ORDER);
             assert_eq!(header.header_size, V2_BARE_HEADER_SIZE);
         });
-        with_basic_file(&valid_header_v3(), |mut disk_file: File| {
+        with_basic_file(&valid_header_v3(), |mut disk_file: RawFile| {
             let header = QcowHeader::new(&mut disk_file).expect("Failed to create Header.");
             assert_eq!(header.version, 3);
             assert_eq!(header.refcount_order, DEFAULT_REFCOUNT_ORDER);
@@ -1832,7 +1833,7 @@ mod tests {
     #[test]
     fn invalid_magic() {
         let invalid_header = vec![0x51u8, 0x46, 0x4a, 0xfb];
-        with_basic_file(&invalid_header, |mut disk_file: File| {
+        with_basic_file(&invalid_header, |mut disk_file: RawFile| {
             QcowHeader::new(&mut disk_file).expect_err("Invalid header worked.");
         });
     }
@@ -1841,7 +1842,7 @@ mod tests {
     fn invalid_refcount_order() {
         let mut header = valid_header_v3();
         header[99] = 2;
-        with_basic_file(&header, |disk_file: File| {
+        with_basic_file(&header, |disk_file: RawFile| {
             QcowFile::from(disk_file).expect_err("Invalid refcount order worked.");
         });
     }
@@ -1850,7 +1851,7 @@ mod tests {
     fn invalid_cluster_bits() {
         let mut header = valid_header_v3();
         header[23] = 3;
-        with_basic_file(&header, |disk_file: File| {
+        with_basic_file(&header, |disk_file: RawFile| {
             QcowFile::from(disk_file).expect_err("Failed to create file.");
         });
     }
@@ -1858,7 +1859,7 @@ mod tests {
     #[test]
     fn test_header_huge_file() {
         let header = test_huge_header();
-        with_basic_file(&header, |disk_file: File| {
+        with_basic_file(&header, |disk_file: RawFile| {
             QcowFile::from(disk_file).expect_err("Failed to create file.");
         });
     }
@@ -1867,7 +1868,7 @@ mod tests {
     fn test_header_crazy_file_size_rejected() {
         let mut header = valid_header_v3();
         &mut header[24..32].copy_from_slice(&[0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1e]);
-        with_basic_file(&header, |disk_file: File| {
+        with_basic_file(&header, |disk_file: RawFile| {
             QcowFile::from(disk_file).expect_err("Failed to create file.");
         });
     }
@@ -1876,7 +1877,7 @@ mod tests {
     fn test_huge_l1_table() {
         let mut header = valid_header_v3();
         header[36] = 0x12;
-        with_basic_file(&header, |disk_file: File| {
+        with_basic_file(&header, |disk_file: RawFile| {
             QcowFile::from(disk_file).expect_err("Failed to create file.");
         });
     }
@@ -1888,7 +1889,7 @@ mod tests {
         header[26] = 1;
         header[31] = 0;
         // 1 TB with the min cluster size makes the arrays too big, it should fail.
-        with_basic_file(&header, |disk_file: File| {
+        with_basic_file(&header, |disk_file: RawFile| {
             QcowFile::from(disk_file).expect_err("Failed to create file.");
         });
     }
@@ -1902,7 +1903,7 @@ mod tests {
         header[31] = 0;
         // set cluster_bits
         header[23] = 16;
-        with_basic_file(&header, |disk_file: File| {
+        with_basic_file(&header, |disk_file: RawFile| {
             let mut qcow = QcowFile::from(disk_file).expect("Failed to create file.");
             qcow.seek(SeekFrom::Start(0x100_0000_0000 - 8))
                 .expect("Failed to seek.");
@@ -1916,7 +1917,7 @@ mod tests {
     fn test_header_huge_num_refcounts() {
         let mut header = valid_header_v3();
         &mut header[56..60].copy_from_slice(&[0x02, 0x00, 0xe8, 0xff]);
-        with_basic_file(&header, |disk_file: File| {
+        with_basic_file(&header, |disk_file: RawFile| {
             QcowFile::from(disk_file).expect_err("Created disk with crazy refcount clusters");
         });
     }
@@ -1925,14 +1926,14 @@ mod tests {
     fn test_header_huge_refcount_offset() {
         let mut header = valid_header_v3();
         &mut header[48..56].copy_from_slice(&[0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x02, 0x00]);
-        with_basic_file(&header, |disk_file: File| {
+        with_basic_file(&header, |disk_file: RawFile| {
             QcowFile::from(disk_file).expect_err("Created disk with crazy refcount offset");
         });
     }
 
     #[test]
     fn write_read_start() {
-        with_basic_file(&valid_header_v3(), |disk_file: File| {
+        with_basic_file(&valid_header_v3(), |disk_file: RawFile| {
             let mut q = QcowFile::from(disk_file).unwrap();
             q.write(b"test first bytes")
                 .expect("Failed to write test string.");
@@ -1945,7 +1946,7 @@ mod tests {
 
     #[test]
     fn offset_write_read() {
-        with_basic_file(&valid_header_v3(), |disk_file: File| {
+        with_basic_file(&valid_header_v3(), |disk_file: RawFile| {
             let mut q = QcowFile::from(disk_file).unwrap();
             let b = [0x55u8; 0x1000];
             q.seek(SeekFrom::Start(0xfff2000)).expect("Failed to seek.");
@@ -1959,7 +1960,7 @@ mod tests {
 
     #[test]
     fn write_zeroes_read() {
-        with_basic_file(&valid_header_v3(), |disk_file: File| {
+        with_basic_file(&valid_header_v3(), |disk_file: RawFile| {
             let mut q = QcowFile::from(disk_file).unwrap();
             // Write some test data.
             let b = [0x55u8; 0x1000];
@@ -1985,7 +1986,7 @@ mod tests {
         // Choose a size that is larger than a cluster.
         // valid_header uses cluster_bits = 12, which corresponds to a cluster size of 4096.
         const CHUNK_SIZE: usize = 4096 * 2 + 512;
-        with_basic_file(&valid_header_v3(), |disk_file: File| {
+        with_basic_file(&valid_header_v3(), |disk_file: RawFile| {
             let mut q = QcowFile::from(disk_file).unwrap();
             // Write some test data.
             let b = [0x55u8; CHUNK_SIZE];
@@ -2006,11 +2007,11 @@ mod tests {
 
     #[test]
     fn test_header() {
-        with_basic_file(&valid_header_v2(), |disk_file: File| {
+        with_basic_file(&valid_header_v2(), |disk_file: RawFile| {
             let q = QcowFile::from(disk_file).unwrap();
             assert_eq!(q.virtual_size(), 0x20_0000_0000);
         });
-        with_basic_file(&valid_header_v3(), |disk_file: File| {
+        with_basic_file(&valid_header_v3(), |disk_file: RawFile| {
             let q = QcowFile::from(disk_file).unwrap();
             assert_eq!(q.virtual_size(), 0x20_0000_0000);
         });
@@ -2018,7 +2019,7 @@ mod tests {
 
     #[test]
     fn read_small_buffer() {
-        with_basic_file(&valid_header_v3(), |disk_file: File| {
+        with_basic_file(&valid_header_v3(), |disk_file: RawFile| {
             let mut q = QcowFile::from(disk_file).unwrap();
             let mut b = [5u8; 16];
             q.seek(SeekFrom::Start(1000)).expect("Failed to seek.");
@@ -2030,7 +2031,7 @@ mod tests {
 
     #[test]
     fn replay_ext4() {
-        with_basic_file(&valid_header_v3(), |disk_file: File| {
+        with_basic_file(&valid_header_v3(), |disk_file: RawFile| {
             let mut q = QcowFile::from(disk_file).unwrap();
             const BUF_SIZE: usize = 0x1000;
             let mut b = [0u8; BUF_SIZE];
@@ -2406,7 +2407,16 @@ mod tests {
 
     #[test]
     fn combo_write_read() {
-        with_default_file(1024 * 1024 * 1024 * 256, |mut qcow_file| {
+        combo_write_read_common(false);
+    }
+
+    #[test]
+    fn combo_write_read_direct() {
+        combo_write_read_common(true);
+    }
+
+    fn combo_write_read_common(direct: bool) {
+        with_default_file(1024 * 1024 * 1024 * 256, direct, |mut qcow_file| {
             const NUM_BLOCKS: usize = 555;
             const BLOCK_SIZE: usize = 0x1_0000;
             const OFFSET: usize = 0x1_0000_0020;
@@ -2459,7 +2469,16 @@ mod tests {
 
     #[test]
     fn seek_data() {
-        with_default_file(0x30000, |mut file| {
+        seek_data_common(false);
+    }
+
+    #[test]
+    fn seek_data_direct() {
+        seek_data_common(true);
+    }
+
+    fn seek_data_common(direct: bool) {
+        with_default_file(0x30000, direct, |mut file| {
             // seek_data at or after the end of the file should return None
             assert_eq!(file.seek_data(0x10000).unwrap(), None);
             assert_eq!(seek_cur(&mut file), 0);
@@ -2492,7 +2511,16 @@ mod tests {
 
     #[test]
     fn seek_hole() {
-        with_default_file(0x30000, |mut file| {
+        seek_hole_common(false);
+    }
+
+    #[test]
+    fn seek_hole_direct() {
+        seek_hole_common(true);
+    }
+
+    fn seek_hole_common(direct: bool) {
+        with_default_file(0x30000, direct, |mut file| {
             // File consisting entirely of a hole
             assert_eq!(file.seek_hole(0).unwrap(), Some(0));
             assert_eq!(seek_cur(&mut file), 0);
@@ -2566,7 +2594,7 @@ mod tests {
 
     #[test]
     fn rebuild_refcounts() {
-        with_basic_file(&valid_header_v3(), |mut disk_file: File| {
+        with_basic_file(&valid_header_v3(), |mut disk_file: RawFile| {
             let header = QcowHeader::new(&mut disk_file).expect("Failed to create Header.");
             let cluster_size = 65536;
             let mut raw_file =

qcow/src/qcow_raw_file.rs

@@ -2,17 +2,17 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE-BSD-3-Clause file.
 
-use std::fs::File;
 use std::io::{self, BufWriter, Seek, SeekFrom};
 use std::mem::size_of;
 
 use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
+use vm_virtio::RawFile;
 use vmm_sys_util::write_zeroes::WriteZeroes;
 
 /// A qcow file. Allows reading/writing clusters and appending clusters.
 #[derive(Debug)]
 pub struct QcowRawFile {
-    file: File,
+    file: RawFile,
     cluster_size: u64,
     cluster_mask: u64,
 }
@@ -20,7 +20,7 @@ pub struct QcowRawFile {
 impl QcowRawFile {
     /// Creates a `QcowRawFile` from the given `File`, `None` is returned if `cluster_size` is not
     /// a power of two.
-    pub fn from(file: File, cluster_size: u64) -> Option<Self> {
+    pub fn from(file: RawFile, cluster_size: u64) -> Option<Self> {
         if cluster_size.count_ones() != 1 {
             return None;
         }
@@ -67,7 +67,7 @@ impl QcowRawFile {
         non_zero_flags: u64,
     ) -> io::Result<()> {
         self.file.seek(SeekFrom::Start(offset))?;
-        let mut buffer = BufWriter::with_capacity(table.len() * size_of::<u64>(), &self.file);
+        let mut buffer = BufWriter::with_capacity(table.len() * size_of::<u64>(), &mut self.file);
         for addr in table {
             let val = if *addr == 0 {
                 0
@@ -92,7 +92,7 @@ impl QcowRawFile {
     /// Writes a refcount block to the file.
     pub fn write_refcount_block(&mut self, offset: u64, table: &[u16]) -> io::Result<()> {
         self.file.seek(SeekFrom::Start(offset))?;
-        let mut buffer = BufWriter::with_capacity(table.len() * size_of::<u16>(), &self.file);
+        let mut buffer = BufWriter::with_capacity(table.len() * size_of::<u16>(), &mut self.file);
         for count in table {
             buffer.write_u16::<BigEndian>(*count)?;
         }
@@ -115,13 +115,8 @@ impl QcowRawFile {
         Ok(Some(new_cluster_address))
     }
 
-    /// Returns a reference to the underlying file.
-    pub fn file(&self) -> &File {
-        &self.file
-    }
-
     /// Returns a mutable reference to the underlying file.
-    pub fn file_mut(&mut self) -> &mut File {
+    pub fn file_mut(&mut self) -> &mut RawFile {
         &mut self.file
     }
 

qcow/src/vec_cache.rs

@@ -120,7 +120,7 @@ impl<T: Cacheable> CacheMap<T> {
     {
         if self.map.len() == self.capacity {
             // TODO(dgreid) - smarter eviction strategy.
-            let to_evict = *self.map.iter().nth(0).unwrap().0;
+            let to_evict = *self.map.iter().next().unwrap().0;
             if let Some(evicted) = self.map.remove(&to_evict) {
                 if evicted.dirty() {
                     write_callback(to_evict, evicted)?;

release-notes.md

@@ -1,37 +1,191 @@
+- [v0.6.0](#v060)
+    - [Directly Assigned Devices Hotplug](#directly-assigned-devices-hotplug)
+    - [Shared Filesystem Improvements](#shared-filesystem-improvements)
+    - [Block and Networking IO Self Offloading](#block-and-networking-io-self-offloading)
+    - [Command Line Interface](#command-line-interface)
+    - [PVH Boot](#pvh-boot)
+    - [Contributors](#contributors)
+- [v0.5.1](#v051)
+- [v0.5.0](#v050)
+    - [Virtual Machine Dynamic Resizing](#virtual-machine-dynamic-resizing)
+    - [Multi-Queue, Multi-Threaded Paravirtualization](#multi-queue-multi-threaded-paravirtualization)
+    - [New Interrupt Management Framework](#new-interrupt-management-framework)
+    - [Development Tools](#development-tools)
+    - [Kata Containers Integration](#kata-containers-integration)
+    - [Contributors](#contributors)
 - [v0.4.0](#v040)
-    + [Dynamic virtual CPUs addition](#dynamic-virtual-cpus-addition)
+    - [Dynamic virtual CPUs addition](#dynamic-virtual-cpus-addition)
-    + [Programmatic firmware tables generation](#programmatic-firmware-tables-generation)
+    - [Programmatic firmware tables generation](#programmatic-firmware-tables-generation)
-    + [Filesystem and block devices vhost-user backends](#filesystem-and-block-devices-vhost-user-backends)
+    - [Filesystem and block devices vhost-user backends](#filesystem-and-block-devices-vhost-user-backends)
-    + [Guest pause and resume](#guest-pause-and-resume)
+    - [Guest pause and resume](#guest-pause-and-resume)
-    + [Userspace IOAPIC by default](#userspace-ioapic-by-default)
+    - [Userspace IOAPIC by default](#userspace-ioapic-by-default)
-    + [PCI BAR reprogramming](#pci-bar-reprogramming)
+    - [PCI BAR reprogramming](#pci-bar-reprogramming)
-    + [New `cloud-hypervisor` organization](#new--cloud-hypervisor--organization)
+    - [New `cloud-hypervisor` organization](#new-cloud-hypervisor-organization)
-    + [Contributors](#contributors)
+    - [Contributors](#contributors-1)
 - [v0.3.0](#v030)
-    + [Block device offloading](#block-device-offloading)
+    - [Block device offloading](#block-device-offloading)
-    + [Network device backend](#network-device-backend)
+    - [Network device backend](#network-device-backend)
-    + [Virtual sockets](#virtual-sockets)
+    - [Virtual sockets](#virtual-sockets)
-    + [HTTP based API](#http-based-api)
+    - [HTTP based API](#http-based-api)
-    + [Memory mapped virtio transport](#memory-mapped-virtio-transport)
+    - [Memory mapped virtio transport](#memory-mapped-virtio-transport)
-    + [Paravirtualized IOMMU](#paravirtualized-iommu)
+    - [Paravirtualized IOMMU](#paravirtualized-iommu)
-    + [Ubuntu 19.10](#ubuntu-1910)
+    - [Ubuntu 19.10](#ubuntu-1910)
-    + [Guest large memory](#guest-large-memory)
+    - [Large memory guests](#large-memory-guests)
 - [v0.2.0](#v020)
-    + [Network device offloading](#network-device-offloading)
+    - [Network device offloading](#network-device-offloading)
-    + [Minimal hardware-reduced ACPI](#minimal-hardware-reduced-acpi)
+    - [Minimal hardware-reduced ACPI](#minimal-hardware-reduced-acpi)
-    + [Debug I/O port](#debug-i-o-port)
+    - [Debug I/O port](#debug-io-port)
-    + [Improved direct device assignment](#improved-direct-device-assignment)
+    - [Improved direct device assignment](#improved-direct-device-assignment)
-    + [Improved shared filesystem](#improved-shared-filesystem)
+    - [Improved shared filesystem](#improved-shared-filesystem)
-    + [Ubuntu bionic based CI](#ubuntu-bionic-based-ci)
+    - [Ubuntu bionic based CI](#ubuntu-bionic-based-ci)
 - [v0.1.0](#v010)
-    + [Shared filesystem](#shared-filesystem)
+    - [Shared filesystem](#shared-filesystem)
-    + [Initial direct device assignment support](#initial-direct-device-assignment-support)
+    - [Initial direct device assignment support](#initial-direct-device-assignment-support)
-    + [Userspace IOAPIC](#userspace-ioapic)
+    - [Userspace IOAPIC](#userspace-ioapic)
-    + [Virtual persistent memory](#virtual-persistent-memory)
+    - [Virtual persistent memory](#virtual-persistent-memory)
-    + [Linux kernel bzImage](#linux-kernel-bzimage)
+    - [Linux kernel bzImage](#linux-kernel-bzimage)
-    + [Console over virtio](#console-over-virtio)
+    - [Console over virtio](#console-over-virtio)
-    + [Unit testing](#unit-testing)
+    - [Unit testing](#unit-testing)
-    + [Integration tests parallelization](#integration-tests-parallelization)
+    - [Integration tests parallelization](#integration-tests-parallelization)
+
+# v0.6.0
+
+This release has been tracked through the [0.6.0 project](https://github.com/cloud-hypervisor/cloud-hypervisor/projects/7).
+
+Highlights for `cloud-hypervisor` version 0.6.0 include:
+
+### Directly Assigned Devices Hotplug
+
+We continued our efforts around supporting dynamically changing the guest
+resources. After adding support for CPU and memory hotplug, Cloud Hypervisor
+now supports hot plugging and hot unplugging directly assigned (a.k.a. `VFIO`)
+devices into an already running guest. This closes the features gap for
+providing a complete Kata Containers workloads support with Cloud Hypervisor.
+
+### Shared Filesystem Improvements
+
+We enhanced our shared filesystem support through many `virtio-fs` improvements.
+By adding support for DAX, parallel processing of multiple requests, `FS_IO`,
+`LSEEK` and the `MMIO` virtio transport layer to our `vhost_user_fs` daemon, we
+improved our filesystem sharing performance, but also made it more stable and
+compatible with other `virtio-fs` implementations.
+
+### Block and Networking IO Self Offloading
+
+When choosing to offload the paravirtualized block and networking I/O to an
+external process (through the `vhost-user` protocol), Cloud Hypervisor now
+automatically spawns its default `vhost-user-blk` and `vhost-user-net` backends
+into their own, separate processes.
+This provides a seamless parvirtualized I/O user experience for those who want
+to run their guest I/O into separate executions contexts.
+
+### Command Line Interface
+
+More and more Cloud Hypervisor services are exposed through the
+[Rest API](https://github.com/cloud-hypervisor/cloud-hypervisor/blob/master/vmm/src/api/openapi/cloud-hypervisor.yaml)
+and thus only accessible via relatively cumbersome HTTP calls. In order
+to abstract those calls into a more user friendly tool, we created a Cloud
+Hypervisor Command Line Interface (CLI) called `ch-remote`.
+The `ch-remote` binary is created with each build and available e.g. at
+`cloud-hypervisor/target/debug/ch-remote` when doing a debug build.
+
+Please check `ch-remote --help` for a complete description of all available
+commands.
+
+### PVH Boot
+
+In addition to the traditional Linux boot protocol, Cloud Hypervisor now
+supports direct kernel booting through the [PVH ABI](https://xenbits.xen.org/docs/unstable/misc/pvh.html).
+
+### Contributors
+
+With the 0.6.0 release, we are welcoming a few new contributors. Many thanks
+to them and to everyone that contributed to this release:
+
+* Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
+* Arron Wang <arron.wang@intel.com>
+* Bin Liu <liubin0329@gmail.com>
+* Bo Chen <chen.bo@intel.com>
+* Cathy Zhang <cathy.zhang@intel.com>
+* Eryu Guan <eguan@linux.alibaba.com>
+* Jose Carlos Venegas Munoz <jose.carlos.venegas.munoz@intel.com>
+* Liu Bo <bo.liu@linux.alibaba.com>
+* Qiu Wenbo <qiuwenbo@phytium.com.cn>
+* Rob Bradford <robert.bradford@intel.com>
+* Samuel Ortiz <sameo@linux.intel.com>
+* Sebastien Boeuf <sebastien.boeuf@intel.com>
+* Sergio Lopez <slp@redhat.com>
+
+# v0.5.1
+
+This is a bugfix release branched off v0.5.0. It contains the following fixes:
+
+* Update DiskConfig to contain missing disk control features (#790) - Samuel Ortiz and Sergio Lopez
+* Prevent memory overcommit via virtio-fs (#763) - Sebastien Boeuf
+* Fixed error reporting for resize command - Samuel Ortiz
+* Double reboot workaround (#783) - Rob Bradford
+* Various CI and development tooling fixes - Sebastien Boeuf, Samuel Ortiz, Rob Bradford
+
+# v0.5.0
+
+This release has been tracked through the [0.5.0 project](https://github.com/cloud-hypervisor/cloud-hypervisor/projects/6).
+
+Highlights for `cloud-hypervisor` version 0.5.0 include:
+
+### Virtual Machine Dynamic Resizing
+
+With 0.4.0 we added support for CPU hot plug, and 0.5.0 adds CPU hot unplug and
+memory hot plug as well. This allows to dynamically resize Cloud Hypervisor
+guests which is needed for e.g. Kubernetes related use cases.
+The memory hot plug implementation is based on the same framework as the CPU hot
+plug/unplug one, i.e. hardware-reduced ACPI notifications to the guest.
+
+Next on our VM resizing roadmap is the PCI devices hotplug feature.
+
+### Multi-Queue, Multi-Threaded Paravirtualization
+
+We enhanced our virtio networking and block support by having both devices use
+multiple I/O queues handled by multiple threads. This improves our default
+paravirtualized networking and block devices throughput.
+
+### New Interrupt Management Framework
+
+We improved our interrupt management implementation by introducing an Interrupt
+Manager framework, based on the currently on-going [rust-vmm vm-device](https://github.com/rust-vmm/vm-device)
+crates discussions. This move made the code significantly cleaner, and allowed
+us to remove several KVM related dependencies from crates like the PCI and
+virtio ones.
+
+### Development Tools
+
+In order to provide a better developer experience, we worked on improving our
+build, development and testing tools.
+Somehow similar to the excellent
+[Firecracker's devtool](https://github.com/firecracker-microvm/firecracker/blob/master/tools/devtool),
+we now provide a [dev_cli script](https://github.com/cloud-hypervisor/cloud-hypervisor/blob/master/scripts/dev_cli.sh).
+
+With this new tool, our users and contributors will be able to build and test
+Cloud Hypervisor through a containerized environment.
+
+### Kata Containers Integration
+
+We spent some significant time and efforts debugging and fixing our integration
+with the [Kata Containers](https://github.com/kata-containers) project. Cloud
+Hypervisor is now a fully supported Kata Containers hypervisor, and is
+integrated into the project's CI.
+
+### Contributors
+
+Many thanks to everyone that contributed to the 0.5.0 release:
+
+* Bo Chen <chen.bo@intel.com>
+* Cathy Zhang <cathy.zhang@intel.com>
+* Qiu Wenbo <qiuwenbo@phytium.com.cn>
+* Rob Bradford <robert.bradford@intel.com>
+* Samuel Ortiz <sameo@linux.intel.com>
+* Sebastien Boeuf <sebastien.boeuf@intel.com>
+* Sergio Lopez <slp@redhat.com>
+* Yang Zhong <yang.zhong@intel.com>
 
 # v0.4.0
 

resources/Dockerfile

@@ -0,0 +1,53 @@
+FROM ubuntu:18.04 as dev
+
+ARG RUST_TOOLCHAIN="1.42.0"
+ARG CLH_SRC_DIR="/cloud-hypervisor"
+ARG CLH_BUILD_DIR="$CLH_SRC_DIR/build"
+ARG CARGO_REGISTRY_DIR="$CLH_BUILD_DIR/cargo_registry"
+ARG CARGO_GIT_REGISTRY_DIR="$CLH_BUILD_DIR/cargo_git_registry"
+
+ENV CARGO_HOME=/usr/local/rust
+ENV RUSTUP_HOME=$CARGO_HOME
+ENV PATH="$PATH:$CARGO_HOME/bin"
+
+# Install all CI dependencies
+RUN apt-get update
+RUN apt-get -yq upgrade
+RUN DEBIAN_FRONTEND=noninteractive apt-get install -yq \
+	build-essential \
+	bc \
+	docker.io \
+	curl \
+	wget \
+	sudo \
+	mtools \
+	libssl-dev \
+	pkg-config \
+	flex \
+	bison \
+	libelf-dev \
+	qemu-utils \
+	qemu-system \
+	libglib2.0-dev \
+	libpixman-1-dev \
+	libseccomp-dev \
+	libcap-ng-dev \
+	socat \
+	dosfstools \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install the rust toolchain
+RUN nohup curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain "$RUST_TOOLCHAIN" \
+    && rustup component add rustfmt \
+    && rustup component add clippy \
+    && cargo install cargo-audit \
+    && rm -rf "$CARGO_HOME/registry" \
+    && ln -s "$CARGO_REGISTRY_DIR" "$CARGO_HOME/registry" \
+    && rm -rf "$CARGO_HOME/git" \
+    && ln -s "$CARGO_GIT_REGISTRY_DIR" "$CARGO_HOME/git"
+
+# Set the rust environment
+RUN echo 'source $CARGO_HOME/env' >> $HOME/.bashrc \
+    && mkdir $HOME/.cargo \
+    && ln -s $CARGO_HOME/env $HOME/.cargo/env

resources/linux-config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 5.3.0-rc3 Kernel Configuration
+# Linux/x86 5.6.0-rc4 Kernel Configuration
 #
 
 #
@@ -11,9 +11,10 @@ CONFIG_GCC_VERSION=80300
 CONFIG_CLANG_VERSION=0
 CONFIG_CC_CAN_LINK=y
 CONFIG_CC_HAS_ASM_GOTO=y
+CONFIG_CC_HAS_ASM_INLINE=y
 CONFIG_CC_HAS_WARN_MAYBE_UNINITIALIZED=y
 CONFIG_IRQ_WORK=y
-CONFIG_BUILDTIME_EXTABLE_SORT=y
+CONFIG_BUILDTIME_TABLE_SORT=y
 CONFIG_THREAD_INFO_IN_TASK=y
 
 #
@@ -21,7 +22,6 @@ CONFIG_THREAD_INFO_IN_TASK=y
 #
 CONFIG_INIT_ENV_ARG_LIMIT=32
 # CONFIG_COMPILE_TEST is not set
-# CONFIG_HEADER_TEST is not set
 CONFIG_LOCALVERSION=""
 # CONFIG_LOCALVERSION_AUTO is not set
 CONFIG_BUILD_SALT=""
@@ -139,6 +139,7 @@ CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y
 
 CONFIG_ARCH_SUPPORTS_NUMA_BALANCING=y
 CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH=y
+CONFIG_CC_HAS_INT128=y
 CONFIG_ARCH_SUPPORTS_INT128=y
 CONFIG_NUMA_BALANCING=y
 # CONFIG_NUMA_BALANCING_DEFAULT_ENABLED is not set
@@ -168,6 +169,7 @@ CONFIG_CGROUP_BPF=y
 CONFIG_SOCK_CGROUP_DATA=y
 CONFIG_NAMESPACES=y
 CONFIG_UTS_NS=y
+# CONFIG_TIME_NS is not set
 CONFIG_IPC_NS=y
 CONFIG_USER_NS=y
 CONFIG_PID_NS=y
@@ -177,6 +179,7 @@ CONFIG_SCHED_AUTOGROUP=y
 # CONFIG_SYSFS_DEPRECATED is not set
 CONFIG_RELAY=y
 # CONFIG_BLK_DEV_INITRD is not set
+# CONFIG_BOOT_CONFIG is not set
 CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y
 # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set
 CONFIG_SYSCTL=y
@@ -187,7 +190,6 @@ CONFIG_EXPERT=y
 CONFIG_MULTIUSER=y
 CONFIG_SGETMASK_SYSCALL=y
 CONFIG_SYSFS_SYSCALL=y
-# CONFIG_SYSCTL_SYSCALL is not set
 CONFIG_FHANDLE=y
 CONFIG_POSIX_TIMERS=y
 CONFIG_PRINTK=y
@@ -212,6 +214,7 @@ CONFIG_KALLSYMS=y
 CONFIG_KALLSYMS_ABSOLUTE_PERCPU=y
 CONFIG_KALLSYMS_BASE_RELATIVE=y
 CONFIG_BPF_SYSCALL=y
+CONFIG_ARCH_WANT_DEFAULT_BPF_JIT=y
 CONFIG_USERFAULTFD=y
 CONFIG_ARCH_HAS_MEMBARRIER_SYNC_CORE=y
 CONFIG_RSEQ=y
@@ -301,6 +304,7 @@ CONFIG_PARAVIRT=y
 CONFIG_PARAVIRT_SPINLOCKS=y
 # CONFIG_XEN is not set
 CONFIG_KVM_GUEST=y
+CONFIG_ARCH_CPUIDLE_HALTPOLL=y
 CONFIG_PVH=y
 CONFIG_KVM_DEBUG_FS=y
 CONFIG_PARAVIRT_TIME_ACCOUNTING=y
@@ -319,6 +323,8 @@ CONFIG_X86_CMPXCHG64=y
 CONFIG_X86_CMOV=y
 CONFIG_X86_MINIMUM_CPU_FAMILY=64
 CONFIG_X86_DEBUGCTLMSR=y
+CONFIG_IA32_FEAT_CTL=y
+CONFIG_X86_VMX_FEATURE_NAMES=y
 # CONFIG_PROCESSOR_SELECT is not set
 CONFIG_CPU_SUP_INTEL=y
 CONFIG_CPU_SUP_AMD=y
@@ -328,7 +334,6 @@ CONFIG_CPU_SUP_ZHAOXIN=y
 CONFIG_HPET_TIMER=y
 CONFIG_DMI=y
 # CONFIG_GART_IOMMU is not set
-# CONFIG_CALGARY_IOMMU is not set
 # CONFIG_MAXSMP is not set
 CONFIG_NR_CPUS_RANGE_BEGIN=2
 CONFIG_NR_CPUS_RANGE_END=512
@@ -354,6 +359,7 @@ CONFIG_PERF_EVENTS_INTEL_CSTATE=y
 CONFIG_X86_16BIT=y
 CONFIG_X86_ESPFIX64=y
 CONFIG_X86_VSYSCALL_EMULATION=y
+# CONFIG_X86_IOPL_IOPERM is not set
 # CONFIG_I8K is not set
 # CONFIG_MICROCODE is not set
 CONFIG_X86_MSR=y
@@ -361,7 +367,6 @@ CONFIG_X86_CPUID=y
 # CONFIG_X86_5LEVEL is not set
 CONFIG_X86_DIRECT_GBPAGES=y
 # CONFIG_X86_CPA_STATISTICS is not set
-CONFIG_ARCH_HAS_MEM_ENCRYPT=y
 CONFIG_AMD_MEM_ENCRYPT=y
 # CONFIG_AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT is not set
 CONFIG_NUMA=y
@@ -388,9 +393,11 @@ CONFIG_X86_PAT=y
 CONFIG_ARCH_USES_PG_UNCACHED=y
 CONFIG_ARCH_RANDOM=y
 CONFIG_X86_SMAP=y
-CONFIG_X86_INTEL_UMIP=y
+# CONFIG_X86_UMIP is not set
-# CONFIG_X86_INTEL_MPX is not set
 # CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS is not set
+CONFIG_X86_INTEL_TSX_MODE_OFF=y
+# CONFIG_X86_INTEL_TSX_MODE_ON is not set
+# CONFIG_X86_INTEL_TSX_MODE_AUTO is not set
 CONFIG_EFI=y
 CONFIG_EFI_STUB=y
 # CONFIG_EFI_MIXED is not set
@@ -404,12 +411,16 @@ CONFIG_SCHED_HRTICK=y
 # CONFIG_KEXEC is not set
 CONFIG_KEXEC_FILE=y
 CONFIG_ARCH_HAS_KEXEC_PURGATORY=y
-CONFIG_KEXEC_VERIFY_SIG=y
+# CONFIG_KEXEC_SIG is not set
 # CONFIG_CRASH_DUMP is not set
 CONFIG_PHYSICAL_START=0x1000000
 CONFIG_RELOCATABLE=y
-# CONFIG_RANDOMIZE_BASE is not set
+CONFIG_RANDOMIZE_BASE=y
+CONFIG_X86_NEED_RELOCS=y
 CONFIG_PHYSICAL_ALIGN=0x1000000
+CONFIG_DYNAMIC_MEMORY_LAYOUT=y
+CONFIG_RANDOMIZE_MEMORY=y
+CONFIG_RANDOMIZE_MEMORY_PHYSICAL_PADDING=0xa
 CONFIG_HOTPLUG_CPU=y
 # CONFIG_BOOTPARAM_HOTPLUG_CPU0 is not set
 # CONFIG_DEBUG_HOTPLUG_CPU0 is not set
@@ -473,12 +484,11 @@ CONFIG_ACPI_PROCESSOR=y
 CONFIG_ACPI_HOTPLUG_CPU=y
 # CONFIG_ACPI_PROCESSOR_AGGREGATOR is not set
 CONFIG_ACPI_THERMAL=y
-CONFIG_ACPI_NUMA=y
 CONFIG_ARCH_HAS_ACPI_TABLE_UPGRADE=y
 # CONFIG_ACPI_DEBUG is not set
 # CONFIG_ACPI_PCI_SLOT is not set
 CONFIG_ACPI_CONTAINER=y
-# CONFIG_ACPI_HOTPLUG_MEMORY is not set
+CONFIG_ACPI_HOTPLUG_MEMORY=y
 CONFIG_ACPI_HOTPLUG_IOAPIC=y
 # CONFIG_ACPI_SBS is not set
 # CONFIG_ACPI_HED is not set
@@ -486,6 +496,7 @@ CONFIG_ACPI_HOTPLUG_IOAPIC=y
 # CONFIG_ACPI_BGRT is not set
 CONFIG_ACPI_REDUCED_HARDWARE_ONLY=y
 # CONFIG_ACPI_NFIT is not set
+CONFIG_ACPI_NUMA=y
 # CONFIG_ACPI_HMAT is not set
 CONFIG_HAVE_ACPI_APEI=y
 CONFIG_HAVE_ACPI_APEI_NMI=y
@@ -493,7 +504,6 @@ CONFIG_HAVE_ACPI_APEI_NMI=y
 # CONFIG_DPTF_POWER is not set
 # CONFIG_PMIC_OPREGION is not set
 # CONFIG_ACPI_CONFIGFS is not set
-CONFIG_ACPI_IORT=y
 CONFIG_X86_PM_TIMER=y
 # CONFIG_SFI is not set
 
@@ -536,6 +546,8 @@ CONFIG_CPU_IDLE=y
 CONFIG_CPU_IDLE_GOV_LADDER=y
 CONFIG_CPU_IDLE_GOV_MENU=y
 # CONFIG_CPU_IDLE_GOV_TEO is not set
+# CONFIG_CPU_IDLE_GOV_HALTPOLL is not set
+# CONFIG_HALTPOLL_CPUIDLE is not set
 # end of CPU Idle
 
 CONFIG_INTEL_IDLE=y
@@ -584,6 +596,8 @@ CONFIG_EFI_RUNTIME_WRAPPERS=y
 # CONFIG_EFI_TEST is not set
 # CONFIG_APPLE_PROPERTIES is not set
 # CONFIG_RESET_ATTACK_MITIGATION is not set
+# CONFIG_EFI_RCI2_TABLE is not set
+# CONFIG_EFI_DISABLE_PCI_DMA is not set
 # end of EFI (Extensible Firmware Interface) Support
 
 CONFIG_EFI_EARLYCON=y
@@ -609,6 +623,7 @@ CONFIG_HAVE_KVM_IRQ_BYPASS=y
 CONFIG_HAVE_KVM_NO_POLL=y
 CONFIG_VIRTUALIZATION=y
 CONFIG_KVM=y
+# CONFIG_KVM_WERROR is not set
 CONFIG_KVM_INTEL=y
 # CONFIG_KVM_AMD is not set
 # CONFIG_VHOST_NET is not set
@@ -643,6 +658,7 @@ CONFIG_ARCH_HAS_SET_MEMORY=y
 CONFIG_ARCH_HAS_SET_DIRECT_MAP=y
 CONFIG_HAVE_ARCH_THREAD_STRUCT_WHITELIST=y
 CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT=y
+CONFIG_HAVE_ASM_MODVERSIONS=y
 CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
 CONFIG_HAVE_RSEQ=y
 CONFIG_HAVE_FUNCTION_ARG_ACCESS_API=y
@@ -656,7 +672,8 @@ CONFIG_HAVE_PERF_REGS=y
 CONFIG_HAVE_PERF_USER_STACK_DUMP=y
 CONFIG_HAVE_ARCH_JUMP_LABEL=y
 CONFIG_HAVE_ARCH_JUMP_LABEL_RELATIVE=y
-CONFIG_HAVE_RCU_TABLE_FREE=y
+CONFIG_MMU_GATHER_TABLE_FREE=y
+CONFIG_MMU_GATHER_RCU_TABLE_FREE=y
 CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG=y
 CONFIG_HAVE_ALIGNED_STRUCT_PAGE=y
 CONFIG_HAVE_CMPXCHG_LOCAL=y
@@ -688,17 +705,16 @@ CONFIG_ARCH_MMAP_RND_BITS=28
 CONFIG_HAVE_COPY_THREAD_TLS=y
 CONFIG_HAVE_STACK_VALIDATION=y
 CONFIG_HAVE_RELIABLE_STACKTRACE=y
-CONFIG_64BIT_TIME=y
+# CONFIG_COMPAT_32BIT_TIME is not set
 CONFIG_HAVE_ARCH_VMAP_STACK=y
 CONFIG_VMAP_STACK=y
 CONFIG_ARCH_HAS_STRICT_KERNEL_RWX=y
 CONFIG_STRICT_KERNEL_RWX=y
 CONFIG_ARCH_HAS_STRICT_MODULE_RWX=y
-CONFIG_ARCH_HAS_REFCOUNT=y
-# CONFIG_REFCOUNT_FULL is not set
 CONFIG_HAVE_ARCH_PREL32_RELOCATIONS=y
 CONFIG_ARCH_USE_MEMREMAP_PROT=y
 # CONFIG_LOCK_EVENT_COUNTS is not set
+CONFIG_ARCH_HAS_MEM_ENCRYPT=y
 
 #
 # GCOV-based kernel profiling
@@ -717,6 +733,7 @@ CONFIG_BASE_SMALL=0
 CONFIG_MODULES_TREE_LOOKUP=y
 CONFIG_BLOCK=y
 CONFIG_BLK_SCSI_REQUEST=y
+CONFIG_BLK_CGROUP_RWSTAT=y
 CONFIG_BLK_DEV_BSG=y
 CONFIG_BLK_DEV_BSGLIB=y
 CONFIG_BLK_DEV_INTEGRITY=y
@@ -726,6 +743,7 @@ CONFIG_BLK_DEV_THROTTLING=y
 CONFIG_BLK_CMDLINE_PARSER=y
 CONFIG_BLK_WBT=y
 # CONFIG_BLK_CGROUP_IOLATENCY is not set
+# CONFIG_BLK_CGROUP_IOCOST is not set
 CONFIG_BLK_WBT_MQ=y
 CONFIG_BLK_DEBUG_FS=y
 # CONFIG_BLK_SED_OPAL is not set
@@ -845,10 +863,10 @@ CONFIG_GENERIC_EARLY_IOREMAP=y
 CONFIG_ARCH_HAS_PTE_DEVMAP=y
 CONFIG_ZONE_DEVICE=y
 CONFIG_DEV_PAGEMAP_OPS=y
-# CONFIG_HMM_MIRROR is not set
 # CONFIG_DEVICE_PRIVATE is not set
 CONFIG_PERCPU_STATS=y
 # CONFIG_GUP_BENCHMARK is not set
+# CONFIG_READ_ONLY_THP_FOR_FS is not set
 CONFIG_ARCH_HAS_PTE_SPECIAL=y
 # end of Memory Management options
 
@@ -865,6 +883,7 @@ CONFIG_UNIX_SCM=y
 CONFIG_UNIX_DIAG=y
 CONFIG_TLS=y
 # CONFIG_TLS_DEVICE is not set
+# CONFIG_TLS_TOE is not set
 CONFIG_XFRM=y
 CONFIG_XFRM_ALGO=y
 CONFIG_XFRM_USER=y
@@ -899,6 +918,7 @@ CONFIG_TCP_CONG_CUBIC=y
 CONFIG_DEFAULT_TCP_CONG="cubic"
 # CONFIG_TCP_MD5SIG is not set
 # CONFIG_IPV6 is not set
+# CONFIG_MPTCP is not set
 # CONFIG_NETWORK_SECMARK is not set
 CONFIG_NET_PTP_CLASSIFY=y
 # CONFIG_NETWORK_PHY_TIMESTAMPING is not set
@@ -928,6 +948,7 @@ CONFIG_HAVE_NET_DSA=y
 # CONFIG_OPENVSWITCH is not set
 CONFIG_VSOCKETS=y
 CONFIG_VSOCKETS_DIAG=y
+# CONFIG_VSOCKETS_LOOPBACK is not set
 CONFIG_VIRTIO_VSOCKETS=y
 CONFIG_VIRTIO_VSOCKETS_COMMON=y
 # CONFIG_NETLINK_DIAG is not set
@@ -973,6 +994,7 @@ CONFIG_STREAM_PARSER=y
 CONFIG_GRO_CELLS=y
 CONFIG_NET_SOCK_MSG=y
 CONFIG_FAILOVER=y
+# CONFIG_ETHTOOL_NETLINK is not set
 CONFIG_HAVE_EBPF_JIT=y
 
 #
@@ -984,11 +1006,11 @@ CONFIG_HAVE_PCI=y
 CONFIG_PCI=y
 CONFIG_PCI_DOMAINS=y
 CONFIG_PCIEPORTBUS=y
+# CONFIG_HOTPLUG_PCI_PCIE is not set
 CONFIG_PCIEAER=y
 # CONFIG_PCIEAER_INJECT is not set
 # CONFIG_PCIE_ECRC is not set
 CONFIG_PCIEASPM=y
-# CONFIG_PCIEASPM_DEBUG is not set
 CONFIG_PCIEASPM_DEFAULT=y
 # CONFIG_PCIEASPM_POWERSAVE is not set
 # CONFIG_PCIEASPM_POWER_SUPERSAVE is not set
@@ -1008,17 +1030,15 @@ CONFIG_PCI_LOCKLESS_CONFIG=y
 # CONFIG_PCI_PASID is not set
 # CONFIG_PCI_P2PDMA is not set
 CONFIG_PCI_LABEL=y
-# CONFIG_HOTPLUG_PCI is not set
+CONFIG_HOTPLUG_PCI=y
+CONFIG_HOTPLUG_PCI_ACPI=y
+# CONFIG_HOTPLUG_PCI_ACPI_IBM is not set
+# CONFIG_HOTPLUG_PCI_CPCI is not set
+# CONFIG_HOTPLUG_PCI_SHPC is not set
 
 #
 # PCI controller drivers
 #
-
-#
-# Cadence PCIe controllers support
-#
-# end of Cadence PCIe controllers support
-
 # CONFIG_VMD is not set
 
 #
@@ -1027,6 +1047,11 @@ CONFIG_PCI_LABEL=y
 # CONFIG_PCIE_DW_PLAT_HOST is not set
 # CONFIG_PCI_MESON is not set
 # end of DesignWare PCI Core Support
+
+#
+# Cadence PCIe controllers support
+#
+# end of Cadence PCIe controllers support
 # end of PCI controller drivers
 
 #
@@ -1063,6 +1088,7 @@ CONFIG_EXTRA_FIRMWARE=""
 CONFIG_FW_LOADER_USER_HELPER=y
 # CONFIG_FW_LOADER_USER_HELPER_FALLBACK is not set
 # CONFIG_FW_LOADER_COMPRESS is not set
+# CONFIG_FW_CACHE is not set
 # end of Firmware loader
 
 CONFIG_ALLOW_DEV_COREDUMP=y
@@ -1113,7 +1139,6 @@ CONFIG_BLK_DEV_RAM_SIZE=16384
 # CONFIG_CDROM_PKTCDVD is not set
 # CONFIG_ATA_OVER_ETH is not set
 CONFIG_VIRTIO_BLK=y
-# CONFIG_VIRTIO_BLK_SCSI is not set
 # CONFIG_BLK_DEV_RBD is not set
 # CONFIG_BLK_DEV_RSXX is not set
 
@@ -1131,7 +1156,6 @@ CONFIG_VIRTIO_BLK=y
 # CONFIG_DUMMY_IRQ is not set
 # CONFIG_IBM_ASM is not set
 # CONFIG_PHANTOM is not set
-# CONFIG_SGI_IOC4 is not set
 # CONFIG_TIFM_CORE is not set
 # CONFIG_ENCLOSURE_SERVICES is not set
 # CONFIG_HP_ILO is not set
@@ -1165,41 +1189,9 @@ CONFIG_VIRTIO_BLK=y
 #
 # Intel MIC & related support
 #
-
-#
-# Intel MIC Bus Driver
-#
 # CONFIG_INTEL_MIC_BUS is not set
-
-#
-# SCIF Bus Driver
-#
 # CONFIG_SCIF_BUS is not set
-
-#
-# VOP Bus Driver
-#
 # CONFIG_VOP_BUS is not set
-
-#
-# Intel MIC Host Driver
-#
-
-#
-# Intel MIC Card Driver
-#
-
-#
-# SCIF Driver
-#
-
-#
-# Intel MIC Coprocessor State Management (COSM) Drivers
-#
-
-#
-# VOP Driver
-#
 # end of Intel MIC & related support
 
 # CONFIG_GENWQE is not set
@@ -1237,6 +1229,7 @@ CONFIG_NETDEVICES=y
 CONFIG_NET_CORE=y
 # CONFIG_BONDING is not set
 # CONFIG_DUMMY is not set
+# CONFIG_WIREGUARD is not set
 # CONFIG_EQUALIZER is not set
 # CONFIG_NET_TEAM is not set
 # CONFIG_MACVLAN is not set
@@ -1253,10 +1246,6 @@ CONFIG_VIRTIO_NET=y
 # CONFIG_NLMON is not set
 # CONFIG_ARCNET is not set
 
-#
-# CAIF transport drivers
-#
-
 #
 # Distributed Switch Architecture drivers
 #
@@ -1371,6 +1360,7 @@ CONFIG_SERIAL_EARLYCON=y
 CONFIG_SERIAL_8250=y
 # CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
 CONFIG_SERIAL_8250_PNP=y
+# CONFIG_SERIAL_8250_16550A_VARIANTS is not set
 # CONFIG_SERIAL_8250_FINTEK is not set
 CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_SERIAL_8250_DMA=y
@@ -1379,11 +1369,11 @@ CONFIG_SERIAL_8250_EXAR=y
 CONFIG_SERIAL_8250_NR_UARTS=1
 CONFIG_SERIAL_8250_RUNTIME_UARTS=1
 # CONFIG_SERIAL_8250_EXTENDED is not set
+CONFIG_SERIAL_8250_DWLIB=y
 # CONFIG_SERIAL_8250_DW is not set
 # CONFIG_SERIAL_8250_RT288X is not set
 CONFIG_SERIAL_8250_LPSS=y
 CONFIG_SERIAL_8250_MID=y
-# CONFIG_SERIAL_8250_MOXA is not set
 
 #
 # Non-8250 serial port support
@@ -1400,6 +1390,7 @@ CONFIG_SERIAL_ARC=y
 CONFIG_SERIAL_ARC_NR_PORTS=1
 # CONFIG_SERIAL_RP2 is not set
 # CONFIG_SERIAL_FSL_LPUART is not set
+# CONFIG_SERIAL_FSL_LINFLEXUART is not set
 # end of Serial drivers
 
 CONFIG_SERIAL_DEV_BUS=y
@@ -1428,6 +1419,7 @@ CONFIG_DEVPORT=y
 # end of Character devices
 
 # CONFIG_RANDOM_TRUST_CPU is not set
+# CONFIG_RANDOM_TRUST_BOOTLOADER is not set
 
 #
 # I2C support
@@ -1478,12 +1470,10 @@ CONFIG_THERMAL_WRITABLE_TRIPS=y
 CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
 # CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE is not set
 # CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE is not set
-# CONFIG_THERMAL_DEFAULT_GOV_POWER_ALLOCATOR is not set
 CONFIG_THERMAL_GOV_FAIR_SHARE=y
 CONFIG_THERMAL_GOV_STEP_WISE=y
 # CONFIG_THERMAL_GOV_BANG_BANG is not set
 CONFIG_THERMAL_GOV_USER_SPACE=y
-# CONFIG_THERMAL_GOV_POWER_ALLOCATOR is not set
 # CONFIG_THERMAL_EMULATION is not set
 
 #
@@ -1510,7 +1500,6 @@ CONFIG_BCMA_POSSIBLE=y
 #
 # Multifunction device drivers
 #
-# CONFIG_MFD_CROS_EC is not set
 # CONFIG_MFD_MADERA is not set
 # CONFIG_HTC_PASIC3 is not set
 # CONFIG_MFD_INTEL_QUARK_I2C_GPIO is not set
@@ -1543,7 +1532,6 @@ CONFIG_VGA_ARB=y
 CONFIG_VGA_ARB_MAX_GPUS=16
 # CONFIG_VGA_SWITCHEROO is not set
 # CONFIG_DRM is not set
-# CONFIG_DRM_DP_CEC is not set
 
 #
 # ARM devices
@@ -1619,7 +1607,7 @@ CONFIG_LCD_CLASS_DEVICE=y
 CONFIG_BACKLIGHT_CLASS_DEVICE=y
 CONFIG_BACKLIGHT_GENERIC=y
 # CONFIG_BACKLIGHT_APPLE is not set
-# CONFIG_BACKLIGHT_PM8941_WLED is not set
+# CONFIG_BACKLIGHT_QCOM_WLED is not set
 # CONFIG_BACKLIGHT_SAHARA is not set
 # end of Backlight & LCD device support
 
@@ -1683,7 +1671,6 @@ CONFIG_HID_GENERIC=y
 # CONFIG_HID_KENSINGTON is not set
 # CONFIG_HID_LCPOWER is not set
 # CONFIG_HID_LENOVO is not set
-# CONFIG_HID_LOGITECH is not set
 # CONFIG_HID_MAGICMOUSE is not set
 # CONFIG_HID_MALTRON is not set
 # CONFIG_HID_MAYFLASH is not set
@@ -1727,7 +1714,6 @@ CONFIG_HID_REDRAGON=y
 
 CONFIG_USB_OHCI_LITTLE_ENDIAN=y
 # CONFIG_USB_SUPPORT is not set
-# CONFIG_UWB is not set
 # CONFIG_MMC is not set
 # CONFIG_MEMSTICK is not set
 # CONFIG_NEW_LEDS is not set
@@ -1750,7 +1736,9 @@ CONFIG_DMA_VIRTUAL_CHANNELS=y
 CONFIG_DMA_ACPI=y
 # CONFIG_ALTERA_MSGDMA is not set
 # CONFIG_INTEL_IDMA64 is not set
+# CONFIG_INTEL_IDXD is not set
 # CONFIG_INTEL_IOATDMA is not set
+# CONFIG_PLX_DMA is not set
 # CONFIG_QCOM_HIDMA_MGMT is not set
 # CONFIG_QCOM_HIDMA is not set
 CONFIG_DW_DMAC_CORE=y
@@ -1759,6 +1747,7 @@ CONFIG_DW_DMAC_CORE=y
 # CONFIG_DW_EDMA is not set
 # CONFIG_DW_EDMA_PCIE is not set
 CONFIG_HSU_DMA=y
+# CONFIG_SF_PDMA is not set
 
 #
 # DMA Clients
@@ -1770,6 +1759,7 @@ CONFIG_HSU_DMA=y
 # DMABUF options
 #
 # CONFIG_SYNC_FILE is not set
+# CONFIG_DMABUF_HEAPS is not set
 # end of DMABUF options
 
 # CONFIG_AUXDISPLAY is not set
@@ -1801,6 +1791,7 @@ CONFIG_VIRTIO_PCI=y
 CONFIG_VIRTIO_PCI_LEGACY=y
 CONFIG_VIRTIO_PMEM=y
 CONFIG_VIRTIO_BALLOON=y
+CONFIG_VIRTIO_MEM=y
 CONFIG_VIRTIO_INPUT=y
 CONFIG_VIRTIO_MMIO=y
 CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
@@ -1811,9 +1802,11 @@ CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
 # CONFIG_HYPERV is not set
 # end of Microsoft Hyper-V guest support
 
+# CONFIG_GREYBUS is not set
 # CONFIG_STAGING is not set
 # CONFIG_X86_PLATFORM_DEVICES is not set
 CONFIG_PMC_ATOM=y
+# CONFIG_MFD_CROS_EC is not set
 # CONFIG_CHROME_PLATFORMS is not set
 # CONFIG_MELLANOX_PLATFORM is not set
 CONFIG_CLKDEV_LOOKUP=y
@@ -1854,6 +1847,7 @@ CONFIG_IOMMU_DMA=y
 # CONFIG_INTEL_IOMMU is not set
 # CONFIG_IRQ_REMAP is not set
 CONFIG_VIRTIO_IOMMU=y
+CONFIG_VIRTIO_IOMMU_TOPOLOGY=y
 
 #
 # Remoteproc drivers
@@ -1899,13 +1893,6 @@ CONFIG_VIRTIO_IOMMU=y
 #
 # end of i.MX SoC drivers
 
-#
-# IXP4xx SoC drivers
-#
-# CONFIG_IXP4XX_QMGR is not set
-# CONFIG_IXP4XX_NPE is not set
-# end of IXP4xx SoC drivers
-
 #
 # Qualcomm SoC drivers
 #
@@ -1943,6 +1930,7 @@ CONFIG_VIRTIO_IOMMU=y
 # CONFIG_BCM_KONA_USB2_PHY is not set
 # CONFIG_PHY_PXA_28NM_HSIC is not set
 # CONFIG_PHY_PXA_28NM_USB2 is not set
+# CONFIG_PHY_INTEL_EMMC is not set
 # end of PHY Subsystem
 
 # CONFIG_POWERCAP is not set
@@ -1954,7 +1942,7 @@ CONFIG_VIRTIO_IOMMU=y
 # end of Performance monitor support
 
 CONFIG_RAS=y
-# CONFIG_THUNDERBOLT is not set
+# CONFIG_USB4 is not set
 
 #
 # Android
@@ -1984,6 +1972,7 @@ CONFIG_DAX=y
 # end of HW tracing support
 
 # CONFIG_FPGA is not set
+# CONFIG_TEE is not set
 # CONFIG_UNISYS_VISORBUS is not set
 # CONFIG_SIOX is not set
 # CONFIG_SLIMBUS is not set
@@ -2023,6 +2012,8 @@ CONFIG_EXPORTFS=y
 CONFIG_FILE_LOCKING=y
 CONFIG_MANDATORY_FILE_LOCKING=y
 CONFIG_FS_ENCRYPTION=y
+CONFIG_FS_ENCRYPTION_ALGS=y
+# CONFIG_FS_VERITY is not set
 CONFIG_FSNOTIFY=y
 CONFIG_DNOTIFY=y
 CONFIG_INOTIFY_USER=y
@@ -2149,6 +2140,7 @@ CONFIG_NLS_MAC_TURKISH=y
 CONFIG_NLS_UTF8=y
 # CONFIG_DLM is not set
 # CONFIG_UNICODE is not set
+CONFIG_IO_WQ=y
 # end of File systems
 
 #
@@ -2195,8 +2187,8 @@ CONFIG_CRYPTO_ALGAPI=y
 CONFIG_CRYPTO_ALGAPI2=y
 CONFIG_CRYPTO_AEAD=y
 CONFIG_CRYPTO_AEAD2=y
-CONFIG_CRYPTO_BLKCIPHER=y
+CONFIG_CRYPTO_SKCIPHER=y
-CONFIG_CRYPTO_BLKCIPHER2=y
+CONFIG_CRYPTO_SKCIPHER2=y
 CONFIG_CRYPTO_HASH=y
 CONFIG_CRYPTO_HASH2=y
 CONFIG_CRYPTO_RNG=y
@@ -2226,6 +2218,8 @@ CONFIG_CRYPTO_GLUE_HELPER_X86=y
 # CONFIG_CRYPTO_DH is not set
 # CONFIG_CRYPTO_ECDH is not set
 # CONFIG_CRYPTO_ECRDSA is not set
+# CONFIG_CRYPTO_CURVE25519 is not set
+# CONFIG_CRYPTO_CURVE25519_X86 is not set
 
 #
 # Authenticated Encryption with Associated Data
@@ -2234,16 +2228,7 @@ CONFIG_CRYPTO_GLUE_HELPER_X86=y
 CONFIG_CRYPTO_GCM=y
 # CONFIG_CRYPTO_CHACHA20POLY1305 is not set
 # CONFIG_CRYPTO_AEGIS128 is not set
-# CONFIG_CRYPTO_AEGIS128L is not set
-# CONFIG_CRYPTO_AEGIS256 is not set
 # CONFIG_CRYPTO_AEGIS128_AESNI_SSE2 is not set
-# CONFIG_CRYPTO_AEGIS128L_AESNI_SSE2 is not set
-# CONFIG_CRYPTO_AEGIS256_AESNI_SSE2 is not set
-# CONFIG_CRYPTO_MORUS640 is not set
-# CONFIG_CRYPTO_MORUS640_SSE2 is not set
-# CONFIG_CRYPTO_MORUS1280 is not set
-# CONFIG_CRYPTO_MORUS1280_SSE2 is not set
-# CONFIG_CRYPTO_MORUS1280_AVX2 is not set
 CONFIG_CRYPTO_SEQIV=y
 CONFIG_CRYPTO_ECHAINIV=y
 
@@ -2263,6 +2248,7 @@ CONFIG_CRYPTO_XTS=y
 # CONFIG_CRYPTO_NHPOLY1305_SSE2 is not set
 # CONFIG_CRYPTO_NHPOLY1305_AVX2 is not set
 # CONFIG_CRYPTO_ADIANTUM is not set
+# CONFIG_CRYPTO_ESSIV is not set
 
 #
 # Hash modes
@@ -2280,6 +2266,9 @@ CONFIG_CRYPTO_CRC32C_INTEL=y
 # CONFIG_CRYPTO_CRC32 is not set
 # CONFIG_CRYPTO_CRC32_PCLMUL is not set
 # CONFIG_CRYPTO_XXHASH is not set
+# CONFIG_CRYPTO_BLAKE2B is not set
+# CONFIG_CRYPTO_BLAKE2S is not set
+# CONFIG_CRYPTO_BLAKE2S_X86 is not set
 CONFIG_CRYPTO_CRCT10DIF=y
 # CONFIG_CRYPTO_CRCT10DIF_PCLMUL is not set
 CONFIG_CRYPTO_GHASH=y
@@ -2310,10 +2299,8 @@ CONFIG_CRYPTO_SHA512=y
 #
 CONFIG_CRYPTO_AES=y
 # CONFIG_CRYPTO_AES_TI is not set
-CONFIG_CRYPTO_AES_X86_64=y
 CONFIG_CRYPTO_AES_NI_INTEL=y
 # CONFIG_CRYPTO_ANUBIS is not set
-CONFIG_CRYPTO_LIB_ARC4=y
 CONFIG_CRYPTO_ARC4=y
 # CONFIG_CRYPTO_BLOWFISH is not set
 # CONFIG_CRYPTO_BLOWFISH_X86_64 is not set
@@ -2370,6 +2357,21 @@ CONFIG_CRYPTO_USER_API=y
 # CONFIG_CRYPTO_USER_API_SKCIPHER is not set
 CONFIG_CRYPTO_USER_API_RNG=y
 # CONFIG_CRYPTO_USER_API_AEAD is not set
+
+#
+# Crypto library routines
+#
+CONFIG_CRYPTO_LIB_AES=y
+CONFIG_CRYPTO_LIB_ARC4=y
+# CONFIG_CRYPTO_LIB_BLAKE2S is not set
+# CONFIG_CRYPTO_LIB_CHACHA is not set
+# CONFIG_CRYPTO_LIB_CURVE25519 is not set
+CONFIG_CRYPTO_LIB_DES=y
+CONFIG_CRYPTO_LIB_POLY1305_RSIZE=11
+CONFIG_CRYPTO_LIB_POLY1305_GENERIC=y
+# CONFIG_CRYPTO_LIB_POLY1305 is not set
+# CONFIG_CRYPTO_LIB_CHACHA20POLY1305 is not set
+CONFIG_CRYPTO_LIB_SHA256=y
 # CONFIG_CRYPTO_HW is not set
 # CONFIG_ASYMMETRIC_KEY_TYPE is not set
 
@@ -2434,15 +2436,16 @@ CONFIG_CPU_RMAP=y
 CONFIG_DQL=y
 CONFIG_NLATTR=y
 CONFIG_IRQ_POLL=y
-# CONFIG_DIMLIB is not set
 CONFIG_UCS2_STRING=y
 CONFIG_HAVE_GENERIC_VDSO=y
 CONFIG_GENERIC_GETTIMEOFDAY=y
+CONFIG_GENERIC_VDSO_TIME_NS=y
 CONFIG_FONT_SUPPORT=y
 # CONFIG_FONTS is not set
 CONFIG_FONT_8x8=y
 CONFIG_FONT_8x16=y
 CONFIG_ARCH_HAS_PMEM_API=y
+CONFIG_MEMREGION=y
 CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE=y
 CONFIG_ARCH_STACKWALK=y
 CONFIG_SBITMAP=y
@@ -2463,6 +2466,8 @@ CONFIG_CONSOLE_LOGLEVEL_QUIET=4
 CONFIG_MESSAGE_LOGLEVEL_DEFAULT=4
 # CONFIG_BOOT_PRINTK_DELAY is not set
 CONFIG_DYNAMIC_DEBUG=y
+CONFIG_SYMBOLIC_ERRNAME=y
+# CONFIG_DEBUG_BUGVERBOSE is not set
 # end of printk and dmesg options
 
 #
@@ -2473,8 +2478,6 @@ CONFIG_DYNAMIC_DEBUG=y
 CONFIG_FRAME_WARN=2048
 CONFIG_STRIP_ASM_SYMS=y
 # CONFIG_READABLE_ASM is not set
-CONFIG_UNUSED_SYMBOLS=y
-CONFIG_DEBUG_FS=y
 # CONFIG_HEADERS_INSTALL is not set
 CONFIG_OPTIMIZE_INLINING=y
 CONFIG_DEBUG_SECTION_MISMATCH=y
@@ -2484,9 +2487,20 @@ CONFIG_STACK_VALIDATION=y
 # CONFIG_DEBUG_FORCE_WEAK_PER_CPU is not set
 # end of Compile-time checks and compiler options
 
+#
+# Generic Kernel Debugging Instruments
+#
 CONFIG_MAGIC_SYSRQ=y
 CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE=0x1
 CONFIG_MAGIC_SYSRQ_SERIAL=y
+CONFIG_DEBUG_FS=y
+CONFIG_HAVE_ARCH_KGDB=y
+# CONFIG_KGDB is not set
+CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y
+# CONFIG_UBSAN is not set
+CONFIG_UBSAN_ALIGNMENT=y
+# end of Generic Kernel Debugging Instruments
+
 CONFIG_DEBUG_KERNEL=y
 CONFIG_DEBUG_MISC=y
 
@@ -2498,45 +2512,50 @@ CONFIG_DEBUG_MISC=y
 # CONFIG_PAGE_OWNER is not set
 # CONFIG_PAGE_POISONING is not set
 # CONFIG_DEBUG_RODATA_TEST is not set
+CONFIG_GENERIC_PTDUMP=y
+# CONFIG_PTDUMP_DEBUGFS is not set
 # CONFIG_DEBUG_OBJECTS is not set
 # CONFIG_SLUB_DEBUG_ON is not set
 # CONFIG_SLUB_STATS is not set
 CONFIG_HAVE_DEBUG_KMEMLEAK=y
 # CONFIG_DEBUG_KMEMLEAK is not set
 # CONFIG_DEBUG_STACK_USAGE is not set
+# CONFIG_SCHED_STACK_END_CHECK is not set
 # CONFIG_DEBUG_VM is not set
 CONFIG_ARCH_HAS_DEBUG_VIRTUAL=y
 # CONFIG_DEBUG_VIRTUAL is not set
 CONFIG_DEBUG_MEMORY_INIT=y
 # CONFIG_DEBUG_PER_CPU_MAPS is not set
 CONFIG_HAVE_ARCH_KASAN=y
+CONFIG_HAVE_ARCH_KASAN_VMALLOC=y
 CONFIG_CC_HAS_KASAN_GENERIC=y
 # CONFIG_KASAN is not set
 CONFIG_KASAN_STACK=1
 # end of Memory Debugging
 
-CONFIG_ARCH_HAS_KCOV=y
-CONFIG_CC_HAS_SANCOV_TRACE_PC=y
-# CONFIG_KCOV is not set
 # CONFIG_DEBUG_SHIRQ is not set
 
 #
-# Debug Lockups and Hangs
+# Debug Oops, Lockups and Hangs
 #
+# CONFIG_PANIC_ON_OOPS is not set
+CONFIG_PANIC_ON_OOPS_VALUE=0
+CONFIG_PANIC_TIMEOUT=0
 # CONFIG_SOFTLOCKUP_DETECTOR is not set
 CONFIG_HARDLOCKUP_CHECK_TIMESTAMP=y
 # CONFIG_HARDLOCKUP_DETECTOR is not set
 # CONFIG_DETECT_HUNG_TASK is not set
 # CONFIG_WQ_WATCHDOG is not set
-# end of Debug Lockups and Hangs
+# end of Debug Oops, Lockups and Hangs
 
-# CONFIG_PANIC_ON_OOPS is not set
+#
-CONFIG_PANIC_ON_OOPS_VALUE=0
+# Scheduler Debugging
-CONFIG_PANIC_TIMEOUT=0
+#
 # CONFIG_SCHED_DEBUG is not set
 CONFIG_SCHED_INFO=y
 # CONFIG_SCHEDSTATS is not set
-# CONFIG_SCHED_STACK_END_CHECK is not set
+# end of Scheduler Debugging
+
 # CONFIG_DEBUG_TIMEKEEPING is not set
 
 #
@@ -2560,11 +2579,17 @@ CONFIG_LOCK_DEBUGGING_SUPPORT=y
 CONFIG_STACKTRACE=y
 # CONFIG_WARN_ALL_UNSEEDED_RANDOM is not set
 # CONFIG_DEBUG_KOBJECT is not set
-CONFIG_DEBUG_BUGVERBOSE=y
+
+#
+# Debug kernel data structures
+#
 CONFIG_DEBUG_LIST=y
 # CONFIG_DEBUG_PLIST is not set
 # CONFIG_DEBUG_SG is not set
 # CONFIG_DEBUG_NOTIFIERS is not set
+CONFIG_BUG_ON_DATA_CORRUPTION=y
+# end of Debug kernel data structures
+
 # CONFIG_DEBUG_CREDENTIALS is not set
 
 #
@@ -2580,14 +2605,13 @@ CONFIG_RCU_CPU_STALL_TIMEOUT=59
 # CONFIG_DEBUG_WQ_FORCE_RR_CPU is not set
 # CONFIG_DEBUG_BLOCK_EXT_DEVT is not set
 # CONFIG_CPU_HOTPLUG_STATE_CONTROL is not set
-# CONFIG_NOTIFIER_ERROR_INJECTION is not set
-# CONFIG_FAULT_INJECTION is not set
 # CONFIG_LATENCYTOP is not set
 CONFIG_USER_STACKTRACE_SUPPORT=y
 CONFIG_HAVE_FUNCTION_TRACER=y
 CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
 CONFIG_HAVE_DYNAMIC_FTRACE=y
 CONFIG_HAVE_DYNAMIC_FTRACE_WITH_REGS=y
+CONFIG_HAVE_DYNAMIC_FTRACE_WITH_DIRECT_CALLS=y
 CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
 CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
 CONFIG_HAVE_FENTRY=y
@@ -2595,6 +2619,49 @@ CONFIG_HAVE_C_RECORDMCOUNT=y
 CONFIG_TRACING_SUPPORT=y
 # CONFIG_FTRACE is not set
 # CONFIG_PROVIDE_OHCI1394_DMA_INIT is not set
+# CONFIG_SAMPLES is not set
+CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y
+CONFIG_STRICT_DEVMEM=y
+# CONFIG_IO_STRICT_DEVMEM is not set
+
+#
+# x86 Debugging
+#
+CONFIG_TRACE_IRQFLAGS_SUPPORT=y
+CONFIG_X86_VERBOSE_BOOTUP=y
+CONFIG_EARLY_PRINTK=y
+# CONFIG_EARLY_PRINTK_DBGP is not set
+# CONFIG_EARLY_PRINTK_USB_XDBC is not set
+# CONFIG_EFI_PGT_DUMP is not set
+# CONFIG_DEBUG_WX is not set
+CONFIG_DOUBLEFAULT=y
+# CONFIG_DEBUG_TLBFLUSH is not set
+CONFIG_HAVE_MMIOTRACE_SUPPORT=y
+# CONFIG_X86_DECODER_SELFTEST is not set
+CONFIG_IO_DELAY_0X80=y
+# CONFIG_IO_DELAY_0XED is not set
+# CONFIG_IO_DELAY_UDELAY is not set
+# CONFIG_IO_DELAY_NONE is not set
+# CONFIG_DEBUG_BOOT_PARAMS is not set
+# CONFIG_CPA_DEBUG is not set
+# CONFIG_DEBUG_ENTRY is not set
+# CONFIG_DEBUG_NMI_SELFTEST is not set
+# CONFIG_X86_DEBUG_FPU is not set
+# CONFIG_PUNIT_ATOM_DEBUG is not set
+# CONFIG_UNWINDER_ORC is not set
+CONFIG_UNWINDER_FRAME_POINTER=y
+# CONFIG_UNWINDER_GUESS is not set
+# end of x86 Debugging
+
+#
+# Kernel Testing and Coverage
+#
+# CONFIG_KUNIT is not set
+# CONFIG_NOTIFIER_ERROR_INJECTION is not set
+# CONFIG_FAULT_INJECTION is not set
+CONFIG_ARCH_HAS_KCOV=y
+CONFIG_CC_HAS_SANCOV_TRACE_PC=y
+# CONFIG_KCOV is not set
 CONFIG_RUNTIME_TESTING_MENU=y
 # CONFIG_LKDTM is not set
 # CONFIG_TEST_LIST_SORT is not set
@@ -2625,38 +2692,5 @@ CONFIG_RUNTIME_TESTING_MENU=y
 # CONFIG_TEST_STACKINIT is not set
 # CONFIG_TEST_MEMINIT is not set
 # CONFIG_MEMTEST is not set
-CONFIG_BUG_ON_DATA_CORRUPTION=y
+# end of Kernel Testing and Coverage
-# CONFIG_SAMPLES is not set
-CONFIG_HAVE_ARCH_KGDB=y
-# CONFIG_KGDB is not set
-CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y
-# CONFIG_UBSAN is not set
-CONFIG_UBSAN_ALIGNMENT=y
-CONFIG_ARCH_HAS_DEVMEM_IS_ALLOWED=y
-CONFIG_STRICT_DEVMEM=y
-# CONFIG_IO_STRICT_DEVMEM is not set
-CONFIG_TRACE_IRQFLAGS_SUPPORT=y
-CONFIG_X86_VERBOSE_BOOTUP=y
-CONFIG_EARLY_PRINTK=y
-# CONFIG_EARLY_PRINTK_DBGP is not set
-# CONFIG_EARLY_PRINTK_USB_XDBC is not set
-# CONFIG_X86_PTDUMP is not set
-# CONFIG_EFI_PGT_DUMP is not set
-# CONFIG_DEBUG_WX is not set
-CONFIG_DOUBLEFAULT=y
-# CONFIG_DEBUG_TLBFLUSH is not set
-CONFIG_HAVE_MMIOTRACE_SUPPORT=y
-CONFIG_IO_DELAY_0X80=y
-# CONFIG_IO_DELAY_0XED is not set
-# CONFIG_IO_DELAY_UDELAY is not set
-# CONFIG_IO_DELAY_NONE is not set
-# CONFIG_DEBUG_BOOT_PARAMS is not set
-# CONFIG_CPA_DEBUG is not set
-# CONFIG_DEBUG_ENTRY is not set
-# CONFIG_DEBUG_NMI_SELFTEST is not set
-# CONFIG_X86_DEBUG_FPU is not set
-# CONFIG_PUNIT_ATOM_DEBUG is not set
-# CONFIG_UNWINDER_ORC is not set
-CONFIG_UNWINDER_FRAME_POINTER=y
-# CONFIG_UNWINDER_GUESS is not set
 # end of Kernel hacking

scripts/dev_cli.sh

@@ -0,0 +1,329 @@
+#!/bin/bash
+
+# Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# Copyright © 2020 Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+CLI_NAME="Cloud Hypervisor"
+
+CTR_IMAGE_TAG="cloudhypervisor/dev"
+CTR_IMAGE_VERSION="v1"
+CTR_IMAGE="${CTR_IMAGE_TAG}:${CTR_IMAGE_VERSION}"
+
+DOCKER_RUNTIME="docker"
+
+# Host paths
+CLH_SCRIPTS_DIR=$(cd "$(dirname "$0")" && pwd)
+CLH_ROOT_DIR=$(cd "${CLH_SCRIPTS_DIR}/.." && pwd)
+CLH_BUILD_DIR="${CLH_ROOT_DIR}/build"
+CLH_CARGO_TARGET="${CLH_BUILD_DIR}/cargo_target"
+CLH_DOCKERFILE="${CLH_SCRIPTS_DIR}/../resources/Dockerfile"
+CLH_CTR_BUILD_DIR="/tmp/cloud-hypervisor/ctr-build"
+CLH_INTEGRATION_WORKLOADS="${HOME}/workloads"
+
+# Container paths
+CTR_CLH_ROOT_DIR="/cloud-hypervisor"
+CTR_CLH_CARGO_BUILT_DIR="${CTR_CLH_ROOT_DIR}/build"
+CTR_CLH_CARGO_TARGET="${CTR_CLH_CARGO_BUILT_DIR}/cargo_target"
+CTR_CLH_INTEGRATION_WORKLOADS="/root/workloads"
+
+# Cargo paths
+# Full path to the cargo registry dir on the host. This appears on the host
+# because we want to persist the cargo registry across container invocations.
+# Otherwise, any rust crates from crates.io would be downloaded again each time
+# we build or test.
+CARGO_REGISTRY_DIR="${CLH_BUILD_DIR}/cargo_registry"
+
+# Full path to the cargo git registry on the host. This serves the same purpose
+# as CARGO_REGISTRY_DIR, for crates downloaded from GitHub repos instead of
+# crates.io.
+CARGO_GIT_REGISTRY_DIR="${CLH_BUILD_DIR}/cargo_git_registry"
+
+# Full path to the cargo target dir on the host.
+CARGO_TARGET_DIR="${CLH_BUILD_DIR}/cargo_target"
+
+# Send a decorated message to stdout, followed by a new line
+#
+say() {
+    [ -t 1 ] && [ -n "$TERM" ] \
+        && echo "$(tput setaf 2)[$CLI_NAME]$(tput sgr0) $*" \
+        || echo "[$CLI_NAME] $*"
+}
+
+# Send a decorated message to stdout, without a trailing new line
+#
+say_noln() {
+    [ -t 1 ] && [ -n "$TERM" ] \
+        && echo -n "$(tput setaf 2)[$CLI_NAME]$(tput sgr0) $*" \
+        || echo "[$CLI_NAME] $*"
+}
+
+# Send a text message to stderr
+#
+say_err() {
+    [ -t 2 ] && [ -n "$TERM" ] \
+        && echo "$(tput setaf 1)[$CLI_NAME] $*$(tput sgr0)" 1>&2 \
+        || echo "[$CLI_NAME] $*" 1>&2
+}
+
+# Send a warning-highlighted text to stdout
+say_warn() {
+    [ -t 1 ] && [ -n "$TERM" ] \
+        && echo "$(tput setaf 3)[$CLI_NAME] $*$(tput sgr0)" \
+        || echo "[$CLI_NAME] $*"
+}
+
+# Exit with an error message and (optional) code
+# Usage: die [-c <error code>] <error message>
+#
+die() {
+    code=1
+    [[ "$1" = "-c" ]] && {
+        code="$2"
+        shift 2
+    }
+    say_err "$@"
+    exit $code
+}
+
+# Exit with an error message if the last exit code is not 0
+#
+ok_or_die() {
+    code=$?
+    [[ $code -eq 0 ]] || die -c $code "$@"
+}
+
+# Make sure the build/ dirs are available. Exit if we can't create them.
+# Upon returning from this call, the caller can be certain the build/ dirs exist.
+#
+ensure_build_dir() {
+    for dir in "$CLH_BUILD_DIR" \
+		   "$CLH_INTEGRATION_WORKLOADS" \
+		   "$CLH_CTR_BUILD_DIR" \
+		   "$CARGO_TARGET_DIR" \
+		   "$CARGO_REGISTRY_DIR" \
+		   "$CARGO_GIT_REGISTRY_DIR"; do
+        mkdir -p "$dir" || die "Error: cannot create dir $dir"
+        [ -x "$dir" ] && [ -w "$dir" ] || \
+            {
+                say "Wrong permissions for $dir. Attempting to fix them ..."
+                chmod +x+w "$dir"
+            } || \
+            die "Error: wrong permissions for $dir. Should be +x+w"
+    done
+}
+
+# Fix main directory permissions after a container ran as root.
+# Since the container ran as root, any files it creates will be owned by root.
+# This fixes that by recursively changing the ownership of /cloud-hypervisor to the
+# current user.
+#
+fix_dir_perms() {
+    # Yes, running Docker to get elevated privileges, just to chown some files
+    # is a dirty hack.
+    $DOCKER_RUNTIME run \
+	--workdir "$CTR_CLH_ROOT_DIR" \
+	   --rm \
+	   --volume /dev:/dev \
+	   --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" \
+	   "$CTR_IMAGE" \
+           chown -R "$(id -u):$(id -g)" "$CTR_CLH_ROOT_DIR"
+
+    return $1
+}
+
+cmd_help() {
+    echo ""
+    echo "Cloud Hypervisor $(basename $0)"
+    echo "Usage: $(basename $0) <command> [<command args>]"
+    echo ""
+    echo "Available commands:"
+    echo ""
+    echo "    build [--debug|--release] [-- [<cargo args>]]"
+    echo "        Build the Cloud Hypervisor binaries."
+    echo "        --debug               Build the debug binaries. This is the default."
+    echo "        --release             Build the release binaries."
+    echo ""
+    echo "    tests [--unit|--cargo|--all] [-- [<cargo test args>]]"
+    echo "        Run the Cloud Hypervisor tests."
+    echo "        --unit               Run the unit tests."
+    echo "        --cargo              Run the cargo tests."
+    echo "        --integration        Run the integration tests."
+    echo "        --all                Run all tests."
+    echo ""
+    echo "    build-container [--type]"
+    echo "        Build the Cloud Hypervisor container."
+    echo "        --dev                Build dev container. This is the default."
+    echo ""
+    echo "    clean [<cargo args>]]"
+    echo "        Remove the Cloud Hypervisor artifacts."
+    echo ""
+    echo "    help"
+    echo "        Display this help message."
+    echo ""
+}
+
+cmd_build() {
+    build="debug"
+
+    while [ $# -gt 0 ]; do
+	case "$1" in
+            "-h"|"--help")  { cmd_help; exit 1;     } ;;
+            "--debug")      { build="debug";      } ;;
+            "--release")    { build="release";    } ;;
+            "--")           { shift; break;         } ;;
+            *)
+		die "Unknown build argument: $1. Please use --help for help."
+		;;
+	esac
+	shift
+    done
+
+    cargo_args=("$@")
+    [ $build = "release" ] && cargo_args+=("--release")
+
+    $DOCKER_RUNTIME run \
+	   --user "$(id -u):$(id -g)" \
+	   --workdir "$CTR_CLH_ROOT_DIR" \
+	   --rm \
+	   --volume /dev:/dev \
+	   --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" \
+	   "$CTR_IMAGE" \
+	   cargo build \
+	         --target-dir "$CTR_CLH_CARGO_TARGET" \
+	         "${cargo_args[@]}" && say "Binaries placed under $CLH_CARGO_TARGET/$build"
+}
+
+cmd_clean() {
+    cargo_args=("$@")
+
+    $DOCKER_RUNTIME run \
+	   --user "$(id -u):$(id -g)" \
+	   --workdir "$CTR_CLH_ROOT_DIR" \
+	   --rm \
+	   --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" \
+	   "$CTR_IMAGE" \
+	   cargo clean \
+	         --target-dir "$CTR_CLH_CARGO_TARGET" \
+	         "${cargo_args[@]}"
+    }
+
+cmd_tests() {
+    unit=false
+    cargo=false
+    integration=false
+
+    while [ $# -gt 0 ]; do
+	case "$1" in
+            "-h"|"--help")    { cmd_help; exit 1;     } ;;
+            "--unit")         { unit=true;      } ;;
+            "--cargo")        { cargo=true;    } ;;
+	    "--integration")  { integration=true;    } ;;
+	    "--all")          { cargo=true; unit=true; integration=true;  } ;;
+            "--")             { shift; break;         } ;;
+            *)
+		die "Unknown tests argument: $1. Please use --help for help."
+		;;
+	esac
+	shift
+    done
+
+    if [ "$unit" = true ] ;  then
+	say "Running unit tests..."
+	$DOCKER_RUNTIME run \
+	       --workdir "$CTR_CLH_ROOT_DIR" \
+	       --rm \
+	       --device /dev/kvm \
+	       --device /dev/net/tun \
+	       --cap-add net_admin \
+	       --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" \
+	       "$CTR_IMAGE" \
+	       ./scripts/run_unit_tests.sh "$@" || fix_dir_perms $? || exit $?
+    fi
+
+    if [ "$cargo" = true ] ;  then
+	say "Running cargo tests..."
+	$DOCKER_RUNTIME run \
+	       --workdir "$CTR_CLH_ROOT_DIR" \
+	       --rm \
+	       --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" \
+	       "$CTR_IMAGE" \
+	       ./scripts/run_cargo_tests.sh || fix_dir_perms $? || exit $?
+    fi
+
+    if [ "$integration" = true ] ;  then
+	say "Running integration tests..."
+	$DOCKER_RUNTIME run \
+	       --workdir "$CTR_CLH_ROOT_DIR" \
+	       --rm \
+	       --privileged \
+	       --security-opt seccomp=unconfined \
+	       --ipc=host \
+	       --net=host \
+	       --mount type=tmpfs,destination=/tmp \
+	       --volume /dev:/dev \
+	       --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" \
+	       --volume "$CLH_INTEGRATION_WORKLOADS:$CTR_CLH_INTEGRATION_WORKLOADS" \
+	       --env USER="root" \
+	       "$CTR_IMAGE" \
+	       ./scripts/run_integration_tests.sh "$@" || fix_dir_perms $? || exit $?
+    fi
+
+    fix_dir_perms $?
+}
+
+cmd_build-container() {
+    container_type="dev"
+
+    while [ $# -gt 0 ]; do
+	case "$1" in
+            "-h"|"--help")  { cmd_help; exit 1;     } ;;
+            "--dev")        { container_type="dev"; } ;;
+            "--")           { shift; break;         } ;;
+            *)
+		die "Unknown build-container argument: $1. Please use --help for help."
+		;;
+	esac
+	shift
+    done
+
+    BUILD_DIR=/tmp/cloud-hypervisor/container/
+
+    mkdir -p $BUILD_DIR
+    cp $CLH_DOCKERFILE $BUILD_DIR
+
+    $DOCKER_RUNTIME build \
+	   --target $container_type \
+	   -t $CTR_IMAGE \
+	   -f $BUILD_DIR/Dockerfile \
+	   $BUILD_DIR
+}
+
+# Parse main command line args.
+#
+while [ $# -gt 0 ]; do
+    case "$1" in
+        -h|--help)              { cmd_help; exit 1;     } ;;
+        -y|--unattended)        { OPT_UNATTENDED=true;  } ;;
+        -*)
+            die "Unknown arg: $1. Please use \`$0 help\` for help."
+            ;;
+        *)
+            break
+            ;;
+    esac
+    shift
+done
+
+# $1 is now a command name. Check if it is a valid command and, if so,
+# run it.
+#
+declare -f "cmd_$1" > /dev/null
+ok_or_die "Unknown command: $1. Please use \`$0 help\` for help."
+
+cmd=cmd_$1
+shift
+
+ensure_build_dir
+
+$cmd "$@"

scripts/run_cargo_tests.sh

@@ -5,21 +5,24 @@ set -x
 source $HOME/.cargo/env
 
 # Install cargo components
-rustup component add clippy
+time rustup component add clippy
-rustup component add rustfmt
+time rustup component add rustfmt
-cargo install --force cargo-audit
+time which cargo-audit || cargo install cargo-audit
 
 # Run cargo builds and checks
-cargo rustc --bin cloud-hypervisor -- -D warnings
+time cargo clippy --all-targets --all-features -- -D warnings
-cargo rustc --bin vhost_user_net -- -D warnings
+time cargo rustc --bin cloud-hypervisor -- -D warnings
-cargo test
+time cargo rustc --bin vhost_user_net -- -D warnings
-cargo audit
+time cargo test
-cargo rustc --bin cloud-hypervisor --no-default-features --features "pci,acpi"  -- -D warnings
+time cargo audit
-cargo rustc --bin vhost_user_net --no-default-features --features "pci,acpi"  -- -D warnings
+time cargo clippy --all-targets --no-default-features --features "pci,acpi" -- -D warnings
-cargo clippy --all-targets --all-features -- -D warnings
+time cargo rustc --bin cloud-hypervisor --no-default-features --features "pci,acpi"  -- -D warnings
-cargo rustc --bin cloud-hypervisor --no-default-features --features "pci"  -- -D warnings
+time cargo rustc --bin vhost_user_net --no-default-features --features "pci,acpi"  -- -D warnings
-cargo rustc --bin vhost_user_net --no-default-features --features "pci"  -- -D warnings
+time cargo clippy --all-targets --no-default-features --features "pci" -- -D warnings
-cargo rustc --bin cloud-hypervisor --no-default-features --features "mmio"  -- -D warnings
+time cargo rustc --bin cloud-hypervisor --no-default-features --features "pci"  -- -D warnings
-cargo rustc --bin vhost_user_net --no-default-features --features "mmio"  -- -D warnings
+time cargo rustc --bin vhost_user_net --no-default-features --features "pci"  -- -D warnings
-find . \( -name "*.rs" ! -wholename "*/out/*.rs" \) | xargs rustfmt --check
+time cargo clippy --all-targets --no-default-features --features "mmio" -- -D warnings
-cargo build --release
+time cargo rustc --bin cloud-hypervisor --no-default-features --features "mmio"  -- -D warnings
+time cargo rustc --bin vhost_user_net --no-default-features --features "mmio"  -- -D warnings
+time cargo fmt -- --check
+time cargo build --release

scripts/run_integration_tests.sh

@@ -6,28 +6,30 @@ source $HOME/.cargo/env
 WORKLOADS_DIR="$HOME/workloads"
 mkdir -p "$WORKLOADS_DIR"
 
+cp scripts/sha1sums $WORKLOADS_DIR
+
 FW_URL=$(curl --silent https://api.github.com/repos/cloud-hypervisor/rust-hypervisor-firmware/releases/latest | grep "browser_download_url" | grep -o 'https://.*[^ "]')
 FW="$WORKLOADS_DIR/hypervisor-fw"
 if [ ! -f "$FW" ]; then
     pushd $WORKLOADS_DIR
-    wget --quiet $FW_URL
+    time wget --quiet $FW_URL || exit 1
     popd
 fi
 
-CLEAR_OS_IMAGE_NAME="clear-31310-cloudguest.img"
+CLEAR_OS_IMAGE_NAME="clear-31311-cloudguest.img"
 CLEAR_OS_IMAGE_URL="https://cloudhypervisorstorage.blob.core.windows.net/images/$CLEAR_OS_IMAGE_NAME"
 CLEAR_OS_IMAGE="$WORKLOADS_DIR/$CLEAR_OS_IMAGE_NAME"
 if [ ! -f "$CLEAR_OS_IMAGE" ]; then
     pushd $WORKLOADS_DIR
-    wget --quiet $CLEAR_OS_IMAGE_URL
+    time wget --quiet $CLEAR_OS_IMAGE_URL || exit 1
     popd
 fi
 
-CLEAR_OS_RAW_IMAGE_NAME="clear-31310-cloudguest-raw.img"
+CLEAR_OS_RAW_IMAGE_NAME="clear-31311-cloudguest-raw.img"
 CLEAR_OS_RAW_IMAGE="$WORKLOADS_DIR/$CLEAR_OS_RAW_IMAGE_NAME"
 if [ ! -f "$CLEAR_OS_RAW_IMAGE" ]; then
     pushd $WORKLOADS_DIR
-    qemu-img convert -p -f qcow2 -O raw $CLEAR_OS_IMAGE_NAME $CLEAR_OS_RAW_IMAGE_NAME
+    time qemu-img convert -p -f qcow2 -O raw $CLEAR_OS_IMAGE_NAME $CLEAR_OS_RAW_IMAGE_NAME || exit 1
     popd
 fi
 
@@ -36,7 +38,7 @@ BIONIC_OS_IMAGE_URL="https://cloudhypervisorstorage.blob.core.windows.net/images
 BIONIC_OS_IMAGE="$WORKLOADS_DIR/$BIONIC_OS_IMAGE_NAME"
 if [ ! -f "$BIONIC_OS_IMAGE" ]; then
     pushd $WORKLOADS_DIR
-    wget --quiet $BIONIC_OS_IMAGE_URL
+    time wget --quiet $BIONIC_OS_IMAGE_URL || exit 1
     popd
 fi
 
@@ -44,7 +46,7 @@ BIONIC_OS_RAW_IMAGE_NAME="bionic-server-cloudimg-amd64-raw.img"
 BIONIC_OS_RAW_IMAGE="$WORKLOADS_DIR/$BIONIC_OS_RAW_IMAGE_NAME"
 if [ ! -f "$BIONIC_OS_RAW_IMAGE" ]; then
     pushd $WORKLOADS_DIR
-    qemu-img convert -p -f qcow2 -O raw $BIONIC_OS_IMAGE_NAME $BIONIC_OS_RAW_IMAGE_NAME
+    time qemu-img convert -p -f qcow2 -O raw $BIONIC_OS_IMAGE_NAME $BIONIC_OS_RAW_IMAGE_NAME || exit 1
     popd
 fi
 
@@ -54,7 +56,7 @@ EOAN_OS_IMAGE_URL="https://cloudhypervisorstorage.blob.core.windows.net/images/$
 EOAN_OS_IMAGE="$WORKLOADS_DIR/$EOAN_OS_IMAGE_NAME"
 if [ ! -f "$EOAN_OS_IMAGE" ]; then
     pushd $WORKLOADS_DIR
-    wget --quiet $EOAN_OS_IMAGE_URL
+    time wget --quiet $EOAN_OS_IMAGE_URL || exit 1
     popd
 fi
 
@@ -62,43 +64,66 @@ EOAN_OS_RAW_IMAGE_NAME="eoan-server-cloudimg-amd64-raw.img"
 EOAN_OS_RAW_IMAGE="$WORKLOADS_DIR/$EOAN_OS_RAW_IMAGE_NAME"
 if [ ! -f "$EOAN_OS_RAW_IMAGE" ]; then
     pushd $WORKLOADS_DIR
-    qemu-img convert -p -f qcow2 -O raw $EOAN_OS_IMAGE_NAME $EOAN_OS_RAW_IMAGE_NAME
+    time qemu-img convert -p -f qcow2 -O raw $EOAN_OS_IMAGE_NAME $EOAN_OS_RAW_IMAGE_NAME || exit 1
     popd
 fi
 
+pushd $WORKLOADS_DIR
+sha1sum sha1sums --check
+if [ $? -ne 0 ]; then
+    echo "sha1sum validation of images failed, remove invalid images to fix the issue."
+    exit 1
+fi
+popd
 
 # Build custom kernel based on virtio-pmem and virtio-fs upstream patches
 VMLINUX_IMAGE="$WORKLOADS_DIR/vmlinux"
+VMLINUX_PVH_IMAGE="$WORKLOADS_DIR/vmlinux.pvh"
 BZIMAGE_IMAGE="$WORKLOADS_DIR/bzImage"
 
-LINUX_CUSTOM_DIR="linux-custom"
+LINUX_CUSTOM_DIR="$WORKLOADS_DIR/linux-custom"
 
-if [ ! -f "$VMLINUX_IMAGE" ]; then
+if [ ! -f "$VMLINUX_IMAGE" ] || [ ! -f "$VMLINUX_PVH_IMAGE" ]; then
     SRCDIR=$PWD
     pushd $WORKLOADS_DIR
-    git clone --depth 1 "https://github.com/cloud-hypervisor/linux.git" -b "virtio-fs-virtio-iommu" $LINUX_CUSTOM_DIR
+    time git clone --depth 1 "https://github.com/cloud-hypervisor/linux.git" -b "virtio-fs-virtio-iommu-virtio-mem-5.6-rc4" $LINUX_CUSTOM_DIR
+    cp $SRCDIR/resources/linux-config $LINUX_CUSTOM_DIR/.config
+    popd
+fi
+
+if [ ! -f "$VMLINUX_IMAGE" ]; then
     pushd $LINUX_CUSTOM_DIR
-    cp $SRCDIR/resources/linux-virtio-fs-virtio-iommu-config .config
+    scripts/config --disable "CONFIG_PVH"
-    make bzImage -j `nproc`
+    time make bzImage -j `nproc`
-    cp vmlinux $VMLINUX_IMAGE
+    cp vmlinux $VMLINUX_IMAGE || exit 1
-    cp arch/x86/boot/bzImage $BZIMAGE_IMAGE
+    cp arch/x86/boot/bzImage $BZIMAGE_IMAGE || exit 1
     popd
+fi
+
+if [ ! -f "$VMLINUX_PVH_IMAGE" ]; then
+    pushd $LINUX_CUSTOM_DIR
+    scripts/config --enable "CONFIG_PVH"
+    time make bzImage -j `nproc`
+    cp vmlinux $VMLINUX_PVH_IMAGE || exit 1
+    popd
+fi
+
+if [ -d "$LINUX_CUSTOM_DIR" ]; then
     rm -rf $LINUX_CUSTOM_DIR
-    popd
 fi
 
 VIRTIOFSD="$WORKLOADS_DIR/virtiofsd"
 QEMU_DIR="qemu_build"
 if [ ! -f "$VIRTIOFSD" ]; then
     pushd $WORKLOADS_DIR
-    git clone --depth 1 "https://gitlab.com/virtio-fs/qemu.git" -b "virtio-fs-dev" $QEMU_DIR
+    git clone --depth 1 "https://github.com/sboeuf/qemu.git" -b "virtio-fs" $QEMU_DIR
     pushd $QEMU_DIR
-    ./configure --prefix=$PWD --target-list=x86_64-softmmu
+    time ./configure --prefix=$PWD --target-list=x86_64-softmmu
-    make virtiofsd -j `nproc`
+    time make virtiofsd -j `nproc`
-    cp virtiofsd $VIRTIOFSD
+    cp virtiofsd $VIRTIOFSD || exit 1
     popd
     rm -rf $QEMU_DIR
-    sudo setcap cap_dac_override,cap_sys_admin+epi "virtiofsd"
+    sudo setcap cap_dac_override,cap_sys_admin+epi "virtiofsd" || exit 1
     popd
 fi
 
@@ -110,7 +135,7 @@ if [ ! -f "$BLK_IMAGE" ]; then
    mkfs.ext4 -j $BLK_IMAGE
    mkdir $MNT_DIR
    sudo mount -t ext4 $BLK_IMAGE $MNT_DIR
-   sudo bash -c "echo bar > $MNT_DIR/foo"
+   sudo bash -c "echo bar > $MNT_DIR/foo" || exit 1
    sudo umount $BLK_IMAGE
    rm -r $MNT_DIR
    popd
@@ -120,16 +145,15 @@ SHARED_DIR="$WORKLOADS_DIR/shared_dir"
 if [ ! -d "$SHARED_DIR" ]; then
     mkdir -p $SHARED_DIR
     echo "foo" > "$SHARED_DIR/file1"
-    echo "bar" > "$SHARED_DIR/file3"
+    echo "bar" > "$SHARED_DIR/file3" || exit 1
 fi
 
 VFIO_DIR="$WORKLOADS_DIR/vfio"
-if [ ! -d "$VFIO_DIR" ]; then
+rm -rf $VFIO_DIR
-    mkdir -p $VFIO_DIR
+mkdir -p $VFIO_DIR
-    cp $CLEAR_OS_IMAGE $VFIO_DIR
+cp $CLEAR_OS_IMAGE $VFIO_DIR
-    cp $FW $VFIO_DIR
+cp $FW $VFIO_DIR
-    cp $VMLINUX_IMAGE $VFIO_DIR
+cp $VMLINUX_IMAGE $VFIO_DIR || exit 1
-fi
 
 # VFIO test network setup.
 # We reserve a different IP class for it: 172.17.0.0/24.
@@ -149,28 +173,41 @@ sudo ip tuntap add vfio-tap2 mode tap
 sudo ip link set vfio-tap2 master vfio-br0
 sudo ip link set vfio-tap2 up
 
+sudo ip tuntap add vfio-tap3 mode tap
+sudo ip link set vfio-tap3 master vfio-br0
+sudo ip link set vfio-tap3 up
+
+# Create tap interface without multipe queues support for vhost_user_net test.
+sudo ip tuntap add name vunet-tap0 mode tap
+# Create tap interface with multipe queues support for vhost_user_net test.
+sudo ip tuntap add name vunet-tap1 mode tap multi_queue
+
 cargo build --release
 sudo setcap cap_net_admin+ep target/release/cloud-hypervisor
 sudo setcap cap_net_admin+ep target/release/vhost_user_net
-sudo setcap cap_dac_override,cap_sys_admin+epi target/release/vhost_user_fs
 
 # We always copy a fresh version of our binary for our L2 guest.
 cp target/release/cloud-hypervisor $VFIO_DIR
+cp target/release/ch-remote $VFIO_DIR
 
 # Enable KSM with some reasonable parameters so that it won't take too long
 # for the memory to be merged between two processes.
-sudo bash -c "echo 10000 > /sys/kernel/mm/ksm/pages_to_scan"
+sudo bash -c "echo 1000000 > /sys/kernel/mm/ksm/pages_to_scan"
 sudo bash -c "echo 10 > /sys/kernel/mm/ksm/sleep_millisecs"
 sudo bash -c "echo 1 > /sys/kernel/mm/ksm/run"
 
 # Ensure test binary has the same caps as the cloud-hypervisor one
-cargo test --no-run --features "integration_tests" -- --nocapture
+time cargo test --no-run --features "integration_tests" -- --nocapture || exit 1
 ls target/debug/deps/cloud_hypervisor-* | xargs -n 1 sudo setcap cap_net_admin+ep
 
+# test_vfio relies on hugepages
+echo 4096 | sudo tee /proc/sys/vm/nr_hugepages
+sudo chmod a+rwX /dev/hugepages
+
 sudo adduser $USER kvm
 newgrp kvm << EOF
 export RUST_BACKTRACE=1
-cargo test --features "integration_tests" -- --nocapture
+time cargo test --features "integration_tests" "$@" -- --nocapture
 EOF
 RES=$?
 
@@ -181,7 +218,7 @@ if [ $RES -eq 0 ]; then
 
     newgrp kvm << EOF
 export RUST_BACKTRACE=1
-cargo test --features "integration_tests,mmio" -- --nocapture
+time cargo test --features "integration_tests,mmio" "$@" -- --nocapture
 EOF
 
     RES=$?
@@ -192,5 +229,10 @@ sudo ip link del vfio-br0
 sudo ip link del vfio-tap0
 sudo ip link del vfio-tap1
 sudo ip link del vfio-tap2
+sudo ip link del vfio-tap3
+
+# Tear vhost_user_net test network down
+sudo ip link del vunet-tap0
+sudo ip link del vunet-tap1
 
 exit $RES

scripts/run_unit_tests.sh

@@ -2,23 +2,13 @@
 
 source $HOME/.cargo/env
 
-# More effective than just cargo test --all as it captures crates within crates
+cargo test --workspace --no-run
-for f in $(find . -name Cargo.toml -printf '%h\n' | sort -u); do
-  pushd $f > /dev/null;
-  cargo test --no-run || exit 1;
-  popd > /dev/null;
-done
-
 pushd target/debug
 ls  | grep net_util | grep -v "\.d" | xargs -n 1 sudo setcap cap_net_admin,cap_net_raw+ep
 popd
 
 sudo adduser $USER kvm
 newgrp kvm << EOF || exit 1
-for f in \$(find . -name Cargo.toml -printf '%h\n' | sort -u); do
-  pushd \$f > /dev/null;
   export RUST_BACKTRACE=1
-  cargo test || exit 1;
+  cargo test --workspace "$@" || exit 1;
-  popd > /dev/null;
-done
 EOF

scripts/sha1sums

@@ -0,0 +1,6 @@
+cf7cfa783082fc4d6b4d1c0a53e4402648c14b82 clear-31311-cloudguest.img
+142a410546b592ff9536b46bb410faf8ac11edee clear-31311-cloudguest-raw.img
+27f3b17962ace69b51f0ddc2012095e3109e6ed8 bionic-server-cloudimg-amd64.img
+8db9cc58b01452ce2d06c313177e6e74d8582d93 bionic-server-cloudimg-amd64-raw.img
+4a452cdcf781f95d31a1668ecb92a937c176709a eoan-server-cloudimg-amd64.img
+91fdfb21df8920fd55915edf7669282cda2505f6 eoan-server-cloudimg-amd64-raw.img

src/bin/ch-remote.rs

@@ -0,0 +1,311 @@
+// Copyright © 2020 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+#[macro_use(crate_authors)]
+extern crate clap;
+extern crate serde_json;
+extern crate vmm;
+
+use clap::{App, AppSettings, Arg, ArgMatches, SubCommand};
+use std::io::{Read, Write};
+use std::os::unix::net::UnixStream;
+use std::process;
+
+#[derive(Debug)]
+enum Error {
+    Socket(std::io::Error),
+    StatusCodeParsing(std::num::ParseIntError),
+    MissingProtocol,
+    ContentLengthParsing(std::num::ParseIntError),
+    ServerResponse(StatusCode),
+    InvalidCPUCount(std::num::ParseIntError),
+    InvalidMemorySize(std::num::ParseIntError),
+    AddDeviceConfig(vmm::config::Error),
+}
+
+#[derive(Clone, Copy, Debug)]
+pub enum StatusCode {
+    Continue,
+    OK,
+    NoContent,
+    BadRequest,
+    NotFound,
+    InternalServerError,
+    NotImplemented,
+    Unknown,
+}
+
+impl StatusCode {
+    fn from_raw(code: usize) -> StatusCode {
+        match code {
+            100 => StatusCode::Continue,
+            200 => StatusCode::OK,
+            204 => StatusCode::NoContent,
+            400 => StatusCode::BadRequest,
+            404 => StatusCode::NotFound,
+            500 => StatusCode::InternalServerError,
+            501 => StatusCode::NotImplemented,
+            _ => StatusCode::Unknown,
+        }
+    }
+
+    fn parse(code: &str) -> Result<StatusCode, Error> {
+        Ok(StatusCode::from_raw(
+            code.trim().parse().map_err(Error::StatusCodeParsing)?,
+        ))
+    }
+
+    fn check(self) -> Result<(), Error> {
+        match self {
+            StatusCode::OK | StatusCode::Continue | StatusCode::NoContent => Ok(()),
+            _ => Err(Error::ServerResponse(self)),
+        }
+    }
+}
+
+fn get_header<'a>(res: &'a str, header: &'a str) -> Option<&'a str> {
+    let header_str = format!("{}: ", header);
+    if let Some(o) = res.find(&header_str) {
+        Some(&res[o + header_str.len()..o + res[o..].find('\r').unwrap()])
+    } else {
+        None
+    }
+}
+
+fn get_status_code(res: &str) -> Result<StatusCode, Error> {
+    if let Some(o) = res.find("HTTP/1.1") {
+        Ok(StatusCode::parse(
+            &res[o + "HTTP/1.1 ".len()..res[o..].find('\r').unwrap()],
+        )?)
+    } else {
+        Err(Error::MissingProtocol)
+    }
+}
+
+fn parse_http_response(socket: &mut UnixStream) -> Result<Option<String>, Error> {
+    let mut res = String::new();
+    let mut body_offset = None;
+    let mut content_length: Option<usize> = None;
+    loop {
+        let mut bytes = vec![0; 256];
+        let count = socket.read(&mut bytes).map_err(Error::Socket)?;
+        res.push_str(std::str::from_utf8(&bytes[0..count]).unwrap());
+
+        // End of headers
+        if let Some(o) = res.find("\r\n\r\n") {
+            body_offset = Some(o + "\r\n\r\n".len());
+
+            // With all headers available we can see if there is any body
+            content_length = if let Some(length) = get_header(&res, "Content-Length") {
+                Some(length.trim().parse().map_err(Error::ContentLengthParsing)?)
+            } else {
+                None
+            };
+
+            if content_length.is_none() {
+                break;
+            }
+        }
+
+        if let Some(body_offset) = body_offset {
+            if let Some(content_length) = content_length {
+                if res.len() >= content_length + body_offset {
+                    break;
+                }
+            }
+        }
+    }
+
+    get_status_code(&res)?.check()?;
+
+    Ok(content_length.and(Some(String::from(&res[body_offset.unwrap()..]))))
+}
+
+fn simple_api_command(
+    socket: &mut UnixStream,
+    method: &str,
+    c: &str,
+    request_body: Option<&str>,
+) -> Result<(), Error> {
+    socket
+        .write_all(
+            format!(
+                "{} /api/v1/vm.{} HTTP/1.1\r\nHost: localhost\r\nAccept: */*\r\n",
+                method, c
+            )
+            .as_bytes(),
+        )
+        .map_err(Error::Socket)?;
+
+    if let Some(request_body) = request_body {
+        socket
+            .write_all(format!("Content-Length: {}\r\n", request_body.len()).as_bytes())
+            .map_err(Error::Socket)?;
+    }
+
+    socket.write_all(b"\r\n").map_err(Error::Socket)?;
+
+    if let Some(request_body) = request_body {
+        socket
+            .write_all(request_body.as_bytes())
+            .map_err(Error::Socket)?;
+    }
+
+    socket.flush().map_err(Error::Socket)?;
+
+    if let Some(body) = parse_http_response(socket)? {
+        println!("{}", body);
+    }
+    Ok(())
+}
+
+fn resize_api_command(
+    socket: &mut UnixStream,
+    cpus: Option<&str>,
+    memory: Option<&str>,
+) -> Result<(), Error> {
+    let desired_vcpus: Option<u8> = if let Some(cpus) = cpus {
+        Some(cpus.parse().map_err(Error::InvalidCPUCount)?)
+    } else {
+        None
+    };
+
+    let desired_ram: Option<u64> = if let Some(memory) = memory {
+        Some(memory.parse().map_err(Error::InvalidMemorySize)?)
+    } else {
+        None
+    };
+
+    let resize = vmm::api::VmResizeData {
+        desired_vcpus,
+        desired_ram,
+    };
+
+    simple_api_command(
+        socket,
+        "PUT",
+        "resize",
+        Some(&serde_json::to_string(&resize).unwrap()),
+    )
+}
+
+fn add_device_api_command(socket: &mut UnixStream, config: &str) -> Result<(), Error> {
+    let device_config = vmm::config::DeviceConfig::parse(config).map_err(Error::AddDeviceConfig)?;
+
+    simple_api_command(
+        socket,
+        "PUT",
+        "add-device",
+        Some(&serde_json::to_string(&device_config).unwrap()),
+    )
+}
+
+fn remove_device_api_command(socket: &mut UnixStream, id: &str) -> Result<(), Error> {
+    let remove_device_data = vmm::api::VmRemoveDeviceData { id: id.to_owned() };
+
+    simple_api_command(
+        socket,
+        "PUT",
+        "remove-device",
+        Some(&serde_json::to_string(&remove_device_data).unwrap()),
+    )
+}
+
+fn do_command(matches: &ArgMatches) -> Result<(), Error> {
+    let mut socket =
+        UnixStream::connect(matches.value_of("api-socket").unwrap()).map_err(Error::Socket)?;
+
+    match matches.subcommand_name() {
+        Some("info") => simple_api_command(&mut socket, "GET", "info", None),
+        Some("resize") => resize_api_command(
+            &mut socket,
+            matches
+                .subcommand_matches("resize")
+                .unwrap()
+                .value_of("cpus"),
+            matches
+                .subcommand_matches("resize")
+                .unwrap()
+                .value_of("memory"),
+        ),
+        Some("add-device") => add_device_api_command(
+            &mut socket,
+            matches
+                .subcommand_matches("add-device")
+                .unwrap()
+                .value_of("device_config")
+                .unwrap(),
+        ),
+        Some("remove-device") => remove_device_api_command(
+            &mut socket,
+            matches
+                .subcommand_matches("remove-device")
+                .unwrap()
+                .value_of("id")
+                .unwrap(),
+        ),
+        Some(c) => simple_api_command(&mut socket, "PUT", c, None),
+        None => unreachable!(),
+    }
+}
+
+fn main() {
+    let app = App::new("ch-remote")
+        .author(crate_authors!())
+        .setting(AppSettings::SubcommandRequired)
+        .about("Remotely control a cloud-hypervisor VMM.")
+        .arg(
+            Arg::with_name("api-socket")
+                .long("api-socket")
+                .help("HTTP API socket path (UNIX domain socket).")
+                .takes_value(true)
+                .min_values(1)
+                .required(true),
+        )
+        .subcommand(
+            SubCommand::with_name("add-device")
+                .about("Add VFIO device")
+                .arg(
+                    Arg::with_name("device_config")
+                        .index(1)
+                        .help(vmm::config::DeviceConfig::SYNTAX),
+                ),
+        )
+        .subcommand(
+            SubCommand::with_name("remove-device")
+                .about("Remove VFIO device")
+                .arg(Arg::with_name("id").index(1).help("<device_id>")),
+        )
+        .subcommand(SubCommand::with_name("info").about("Info on the VM"))
+        .subcommand(SubCommand::with_name("pause").about("Pause the VM"))
+        .subcommand(SubCommand::with_name("reboot").about("Reboot the VM"))
+        .subcommand(
+            SubCommand::with_name("resize")
+                .about("Resize the VM")
+                .arg(
+                    Arg::with_name("cpus")
+                        .long("cpus")
+                        .help("New vCPUs count")
+                        .takes_value(true)
+                        .number_of_values(1),
+                )
+                .arg(
+                    Arg::with_name("memory")
+                        .long("memory")
+                        .help("New memory size (in MiB)")
+                        .takes_value(true)
+                        .number_of_values(1),
+                ),
+        )
+        .subcommand(SubCommand::with_name("resume").about("Resume the VM"))
+        .subcommand(SubCommand::with_name("shutdown").about("Shutdown the VM"));
+
+    let matches = app.get_matches();
+
+    if let Err(e) = do_command(&matches) {
+        eprintln!("Error running command: {:?}", e);
+        process::exit(1)
+    };
+}

src/bin/vhost_user_blk.rs

@@ -10,237 +10,10 @@
 
 #[macro_use(crate_version, crate_authors)]
 extern crate clap;
-extern crate log;
+extern crate vhost_user_block;
-extern crate vhost_rs;
-extern crate vhost_user_backend;
-extern crate vm_virtio;
 
 use clap::{App, Arg};
-use epoll;
+use vhost_user_block::start_block_backend;
-use log::*;
-use std::fs::File;
-use std::fs::OpenOptions;
-use std::io::Read;
-use std::io::{Seek, SeekFrom, Write};
-use std::mem;
-use std::path::PathBuf;
-use std::process;
-use std::slice;
-use std::sync::{Arc, RwLock};
-use std::vec::Vec;
-
-use qcow::{self, ImageType, QcowFile};
-
-use vhost_rs::vhost_user::message::*;
-use vhost_user_backend::{VhostUserBackend, VhostUserDaemon, Vring, VringWorker};
-
-use virtio_bindings::bindings::virtio_blk::*;
-use vm_memory::{Bytes, GuestMemoryError, GuestMemoryMmap};
-use vm_virtio::block::{build_disk_image_id, Request};
-
-const QUEUE_SIZE: usize = 1024;
-const NUM_QUEUES: usize = 1;
-const SECTOR_SHIFT: u8 = 9;
-const SECTOR_SIZE: u64 = (0x01 as u64) << SECTOR_SHIFT;
-const BLK_SIZE: u32 = 512;
-
-trait DiskFile: Read + Seek + Write + Send + Sync {}
-impl<D: Read + Seek + Write + Send + Sync> DiskFile for D {}
-
-pub type Result<T> = std::result::Result<T, Error>;
-pub type VhostUserBackendResult<T> = std::result::Result<T, std::io::Error>;
-
-#[derive(Debug)]
-pub enum Error {
-    /// Failed to detect image type.
-    DetectImageType,
-    /// Bad memory address.
-    GuestMemory(GuestMemoryError),
-    /// Can't open image file.
-    OpenImage,
-    /// Failed to parse image parameter.
-    ParseImageParam,
-    /// Failed to parse sock parameter.
-    ParseSockParam,
-}
-
-struct VhostUserBlkBackend {
-    mem: Option<GuestMemoryMmap>,
-    vring_worker: Option<Arc<VringWorker>>,
-    disk_image: Box<dyn DiskFile>,
-    disk_image_id: Vec<u8>,
-    disk_nsectors: u64,
-    config: virtio_blk_config,
-}
-
-impl VhostUserBlkBackend {
-    pub fn new(image_path: String) -> Result<Self> {
-        let raw_img: File = OpenOptions::new()
-            .read(true)
-            .write(true)
-            .open(&image_path)
-            .unwrap();
-
-        let image_id = build_disk_image_id(&PathBuf::from(&image_path));
-        let image_type = qcow::detect_image_type(&raw_img).unwrap();
-        let mut image = match image_type {
-            ImageType::Raw => Box::new(vm_virtio::RawFile::new(raw_img)) as Box<dyn DiskFile>,
-            ImageType::Qcow2 => Box::new(QcowFile::from(raw_img).unwrap()) as Box<dyn DiskFile>,
-        };
-
-        let nsectors = (image.seek(SeekFrom::End(0)).unwrap() as u64) / SECTOR_SIZE;
-        let mut config = virtio_blk_config::default();
-
-        config.capacity = nsectors;
-        config.blk_size = BLK_SIZE;
-        config.size_max = 65535;
-        config.seg_max = 128 - 2;
-        config.min_io_size = 1;
-        config.opt_io_size = 1;
-        config.num_queues = 1;
-
-        Ok(VhostUserBlkBackend {
-            mem: None,
-            vring_worker: None,
-            disk_image: image,
-            disk_image_id: image_id,
-            disk_nsectors: nsectors,
-            config,
-        })
-    }
-
-    pub fn process_queue(&mut self, vring: &mut Vring) -> bool {
-        let mut used_any = false;
-        let mem = match self.mem.as_ref() {
-            Some(m) => m,
-            None => return false,
-        };
-
-        while let Some(head) = vring.mut_queue().iter(mem).next() {
-            debug!("got an element in the queue");
-            let len;
-            match Request::parse(&head, mem) {
-                Ok(request) => {
-                    debug!("element is a valid request");
-                    let status = match request.execute(
-                        &mut self.disk_image,
-                        self.disk_nsectors,
-                        mem,
-                        &self.disk_image_id,
-                    ) {
-                        Ok(l) => {
-                            len = l;
-                            VIRTIO_BLK_S_OK
-                        }
-                        Err(e) => {
-                            len = 1;
-                            e.status()
-                        }
-                    };
-                    mem.write_obj(status, request.status_addr).unwrap();
-                }
-                Err(err) => {
-                    error!("failed to parse available descriptor chain: {:?}", err);
-                    len = 0;
-                }
-            }
-            vring.mut_queue().add_used(mem, head.index, len);
-            used_any = true;
-        }
-
-        used_any
-    }
-}
-
-impl VhostUserBackend for VhostUserBlkBackend {
-    fn num_queues(&self) -> usize {
-        NUM_QUEUES
-    }
-
-    fn max_queue_size(&self) -> usize {
-        QUEUE_SIZE
-    }
-
-    fn features(&self) -> u64 {
-        1 << VIRTIO_BLK_F_MQ
-            | 1 << VIRTIO_F_VERSION_1
-            | VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits()
-    }
-
-    fn protocol_features(&self) -> VhostUserProtocolFeatures {
-        VhostUserProtocolFeatures::CONFIG
-    }
-
-    fn update_memory(&mut self, mem: GuestMemoryMmap) -> VhostUserBackendResult<()> {
-        self.mem = Some(mem);
-        Ok(())
-    }
-
-    fn handle_event(
-        &mut self,
-        device_event: u16,
-        evset: epoll::Events,
-        vrings: &[Arc<RwLock<Vring>>],
-    ) -> VhostUserBackendResult<bool> {
-        if evset != epoll::Events::EPOLLIN {
-            warn!("invalid events operation");
-            return Ok(false);
-        }
-
-        debug!("event received: {:?}", device_event);
-
-        let mut vring = vrings[0].write().unwrap();
-        if self.process_queue(&mut vring) {
-            debug!("signalling queue");
-            vring.signal_used_queue().unwrap();
-        }
-
-        Ok(false)
-    }
-
-    fn get_config(&self, _offset: u32, _size: u32) -> Vec<u8> {
-        // self.config is a statically allocated virtio_blk_config
-        let buf = unsafe {
-            slice::from_raw_parts(
-                &self.config as *const virtio_blk_config as *const _,
-                mem::size_of::<virtio_blk_config>(),
-            )
-        };
-
-        buf.to_vec()
-    }
-}
-
-pub struct VhostUserBlkBackendConfig<'a> {
-    pub image: &'a str,
-    pub sock: &'a str,
-}
-
-impl<'a> VhostUserBlkBackendConfig<'a> {
-    pub fn parse(backend: &'a str) -> Result<Self> {
-        let params_list: Vec<&str> = backend.split(',').collect();
-
-        let mut image: &str = "";
-        let mut sock: &str = "";
-
-        for param in params_list.iter() {
-            if param.starts_with("image=") {
-                image = &param[6..];
-            } else if param.starts_with("sock=") {
-                sock = &param[5..];
-            }
-        }
-
-        if image.is_empty() {
-            return Err(Error::ParseImageParam);
-        }
-        if sock.is_empty() {
-            return Err(Error::ParseSockParam);
-        }
-
-        Ok(VhostUserBlkBackendConfig { image, sock })
-    }
-}
 
 fn main() {
     let cmd_arguments = App::new("vhost-user-blk backend")
@@ -248,53 +21,18 @@ fn main() {
         .author(crate_authors!())
         .about("Launch a vhost-user-blk backend.")
         .arg(
-            Arg::with_name("backend")
+            Arg::with_name("block-backend")
-                .long("backend")
+                .long("block-backend")
                 .help(
-                    "Backend parameters \"image=<image_path>,\
+                    "vhost-user-block backend parameters \
-                     sock=<socket_path>\"",
+                     \"image=<image_path>,sock=<socket_path>,num_queues=<number_of_queues>,\
+                     readonly=true|false,direct=true|false,poll_queue=true|false\"",
                 )
                 .takes_value(true)
                 .min_values(1),
         )
         .get_matches();
 
-    let vhost_user_blk_backend = cmd_arguments.value_of("backend").unwrap();
+    let backend_command = cmd_arguments.value_of("block-backend").unwrap();
-
+    start_block_backend(backend_command);
-    let backend_config = match VhostUserBlkBackendConfig::parse(vhost_user_blk_backend) {
-        Ok(config) => config,
-        Err(e) => {
-            println!("Failed parsing parameters {:?}", e);
-            process::exit(1);
-        }
-    };
-
-    let blk_backend = Arc::new(RwLock::new(
-        VhostUserBlkBackend::new(backend_config.image.to_string()).unwrap(),
-    ));
-
-    debug!("blk_backend is created!\n");
-
-    let name = "vhost-user-blk-backend";
-    let mut blk_daemon = VhostUserDaemon::new(
-        name.to_string(),
-        backend_config.sock.to_string(),
-        blk_backend.clone(),
-    )
-    .unwrap();
-    debug!("blk_daemon is created!\n");
-
-    let vring_worker = blk_daemon.get_vring_worker();
-
-    blk_backend.write().unwrap().vring_worker = Some(vring_worker);
-
-    if let Err(e) = blk_daemon.start() {
-        println!(
-            "failed to start daemon for vhost-user-blk with error: {:?}\n",
-            e
-        );
-        process::exit(1);
-    }
-
-    blk_daemon.wait().unwrap();
 }

src/bin/vhost_user_fs.rs

@@ -11,25 +11,33 @@ extern crate vm_virtio;
 
 use clap::{App, Arg};
 use epoll;
+use futures::executor::{ThreadPool, ThreadPoolBuilder};
 use libc::EFD_NONBLOCK;
 use log::*;
-use std::os::unix::io::AsRawFd;
+use std::num::Wrapping;
 use std::sync::{Arc, RwLock};
 use std::{convert, error, fmt, io, process};
 
 use vhost_rs::vhost_user::message::*;
+use vhost_rs::vhost_user::SlaveFsCacheReq;
 use vhost_user_backend::{VhostUserBackend, VhostUserDaemon, Vring};
+use vhost_user_fs::descriptor_utils::Error as VufDescriptorError;
 use vhost_user_fs::descriptor_utils::{Reader, Writer};
 use vhost_user_fs::filesystem::FileSystem;
 use vhost_user_fs::passthrough::{self, PassthroughFs};
 use vhost_user_fs::server::Server;
 use vhost_user_fs::Error as VhostUserFsError;
 use virtio_bindings::bindings::virtio_net::*;
-use vm_memory::GuestMemoryMmap;
+use virtio_bindings::bindings::virtio_ring::{
+    VIRTIO_RING_F_EVENT_IDX, VIRTIO_RING_F_INDIRECT_DESC,
+};
+use vm_memory::{GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
+use vm_virtio::queue::DescriptorChain;
 use vmm_sys_util::eventfd::EventFd;
 
 const QUEUE_SIZE: usize = 1024;
 const NUM_QUEUES: usize = 2;
+const THREAD_POOL_SIZE: usize = 64;
 
 // The guest queued an available buffer for the high priority queue.
 const HIPRIO_QUEUE_EVENT: u16 = 0;
@@ -44,7 +52,9 @@ type VhostUserBackendResult<T> = std::result::Result<T, std::io::Error>;
 #[derive(Debug)]
 enum Error {
     /// Failed to create kill eventfd.
-    CreateKillEventFd,
+    CreateKillEventFd(io::Error),
+    /// Failed to create thread pool.
+    CreateThreadPool(io::Error),
     /// Failed to handle event other than input event.
     HandleEventNotEpollIn,
     /// Failed to handle unknown event.
@@ -53,6 +63,10 @@ enum Error {
     NoMemoryConfigured,
     /// Processing queue failed.
     ProcessQueue(VhostUserFsError),
+    /// Creating a queue reader failed.
+    QueueReader(VufDescriptorError),
+    /// Creating a queue writer failed.
+    QueueWriter(VufDescriptorError),
 }
 
 impl fmt::Display for Error {
@@ -70,9 +84,13 @@ impl convert::From<Error> for io::Error {
 }
 
 struct VhostUserFsBackend<F: FileSystem + Send + Sync + 'static> {
-    mem: Option<GuestMemoryMmap>,
+    mem: Option<GuestMemoryAtomic<GuestMemoryMmap>>,
     kill_evt: EventFd,
     server: Arc<Server<F>>,
+    // handle request from slave to master
+    vu_req: Option<SlaveFsCacheReq>,
+    event_idx: bool,
+    pool: ThreadPool,
 }
 
 impl<F: FileSystem + Send + Sync + 'static> Clone for VhostUserFsBackend<F> {
@@ -81,46 +99,80 @@ impl<F: FileSystem + Send + Sync + 'static> Clone for VhostUserFsBackend<F> {
             mem: self.mem.clone(),
             kill_evt: self.kill_evt.try_clone().unwrap(),
             server: self.server.clone(),
+            vu_req: self.vu_req.clone(),
+            event_idx: self.event_idx,
+            pool: self.pool.clone(),
         }
     }
 }
 
 impl<F: FileSystem + Send + Sync + 'static> VhostUserFsBackend<F> {
-    fn new(fs: F) -> Result<Self> {
+    fn new(fs: F, thread_pool_size: usize) -> Result<Self> {
         Ok(VhostUserFsBackend {
             mem: None,
-            kill_evt: EventFd::new(EFD_NONBLOCK).map_err(|_| Error::CreateKillEventFd)?,
+            kill_evt: EventFd::new(EFD_NONBLOCK).map_err(Error::CreateKillEventFd)?,
             server: Arc::new(Server::new(fs)),
+            vu_req: None,
+            event_idx: false,
+            pool: ThreadPoolBuilder::new()
+                .pool_size(thread_pool_size)
+                .create()
+                .map_err(Error::CreateThreadPool)?,
         })
     }
 
-    fn process_queue(&mut self, vring: &mut Vring) -> Result<()> {
+    fn process_queue(&mut self, vring_lock: Arc<RwLock<Vring>>) -> Result<bool> {
-        let mem = self.mem.as_ref().ok_or(Error::NoMemoryConfigured)?;
+        let mut used_any = false;
+        let (atomic_mem, mem) = match &self.mem {
+            Some(m) => (m, m.memory()),
+            None => return Err(Error::NoMemoryConfigured),
+        };
+        let mut vring = vring_lock.write().unwrap();
 
-        let mut used_desc_heads = [(0, 0); QUEUE_SIZE];
-        let mut used_count = 0;
         while let Some(avail_desc) = vring.mut_queue().iter(&mem).next() {
-            let head_index = avail_desc.index;
+            used_any = true;
-            let reader = Reader::new(mem, avail_desc.clone()).unwrap();
-            let writer = Writer::new(mem, avail_desc.clone()).unwrap();
 
-            let total = self
+            // Prepare a set of objects that can be moved to the worker thread.
-                .server
+            let desc_head = avail_desc.get_head();
-                .handle_message(reader, writer)
+            let atomic_mem = atomic_mem.clone();
-                .map_err(Error::ProcessQueue)?;
+            let server = self.server.clone();
+            let mut vu_req = self.vu_req.clone();
+            let event_idx = self.event_idx;
+            let vring_lock = vring_lock.clone();
 
-            used_desc_heads[used_count] = (head_index, total);
+            self.pool.spawn_ok(async move {
-            used_count += 1;
+                let mem = atomic_mem.memory();
+                let desc = DescriptorChain::new_from_head(&mem, desc_head).unwrap();
+                let head_index = desc.index;
+
+                let reader = Reader::new(&mem, desc.clone())
+                    .map_err(Error::QueueReader)
+                    .unwrap();
+                let writer = Writer::new(&mem, desc.clone())
+                    .map_err(Error::QueueWriter)
+                    .unwrap();
+
+                server
+                    .handle_message(reader, writer, vu_req.as_mut())
+                    .map_err(Error::ProcessQueue)
+                    .unwrap();
+
+                let mut vring = vring_lock.write().unwrap();
+
+                if event_idx {
+                    if let Some(used_idx) = vring.mut_queue().add_used(&mem, head_index, 0) {
+                        if vring.needs_notification(&mem, Wrapping(used_idx)) {
+                            vring.signal_used_queue().unwrap();
+                        }
+                    }
+                } else {
+                    vring.mut_queue().add_used(&mem, head_index, 0);
+                    vring.signal_used_queue().unwrap();
+                }
+            });
         }
 
-        if used_count > 0 {
+        Ok(used_any)
-            for &(desc_index, _) in &used_desc_heads[..used_count] {
-                vring.mut_queue().add_used(&mem, desc_index, 0);
-            }
-            vring.signal_used_queue().unwrap();
-        }
-
-        Ok(())
     }
 }
 
@@ -134,15 +186,22 @@ impl<F: FileSystem + Send + Sync + 'static> VhostUserBackend for VhostUserFsBack
     }
 
     fn features(&self) -> u64 {
-        1 << VIRTIO_F_VERSION_1 | VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits()
+        1 << VIRTIO_F_VERSION_1
+            | 1 << VIRTIO_RING_F_INDIRECT_DESC
+            | 1 << VIRTIO_RING_F_EVENT_IDX
+            | VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits()
     }
 
     fn protocol_features(&self) -> VhostUserProtocolFeatures {
-        VhostUserProtocolFeatures::all()
+        VhostUserProtocolFeatures::MQ | VhostUserProtocolFeatures::SLAVE_REQ
+    }
+
+    fn set_event_idx(&mut self, enabled: bool) {
+        self.event_idx = enabled;
     }
 
     fn update_memory(&mut self, mem: GuestMemoryMmap) -> VhostUserBackendResult<()> {
-        self.mem = Some(mem);
+        self.mem = Some(GuestMemoryAtomic::new(mem));
         Ok(())
     }
 
@@ -156,25 +215,52 @@ impl<F: FileSystem + Send + Sync + 'static> VhostUserBackend for VhostUserFsBack
             return Err(Error::HandleEventNotEpollIn.into());
         }
 
-        match device_event {
+        let mem = match &self.mem {
+            Some(m) => m.memory(),
+            None => return Err(Error::NoMemoryConfigured.into()),
+        };
+
+        let vring_lock = match device_event {
             HIPRIO_QUEUE_EVENT => {
                 debug!("HIPRIO_QUEUE_EVENT");
+                vrings[0].clone()
             }
             REQ_QUEUE_EVENT => {
-                debug!("REQ_QUEUE_EVENT");
+                debug!("QUEUE_EVENT");
-                let mut vring = vrings[1].write().unwrap();
+                vrings[1].clone()
-                self.process_queue(&mut vring)?;
-            }
-            KILL_EVENT => {
-                debug!("KILL_EVENT");
-                self.kill_evt.read().unwrap();
-                return Ok(true);
             }
             _ => return Err(Error::HandleEventUnknownEvent.into()),
+        };
+
+        if self.event_idx {
+            // vm-virtio's Queue implementation only checks avail_index
+            // once, so to properly support EVENT_IDX we need to keep
+            // calling process_queue() until it stops finding new
+            // requests on the queue.
+            loop {
+                {
+                    let mut vring = vring_lock.write().unwrap();
+                    vring.mut_queue().update_avail_event(&mem);
+                }
+                if !self.process_queue(vring_lock.clone())? {
+                    break;
+                }
+            }
+        } else {
+            // Without EVENT_IDX, a single call is enough.
+            self.process_queue(vring_lock)?;
         }
 
         Ok(false)
     }
+
+    fn exit_event(&self) -> Option<(EventFd, Option<u16>)> {
+        Some((self.kill_evt.try_clone().unwrap(), Some(KILL_EVENT)))
+    }
+
+    fn set_slave_req_fd(&mut self, vu_req: SlaveFsCacheReq) {
+        self.vu_req = Some(vu_req);
+    }
 }
 
 fn main() {
@@ -196,6 +282,18 @@ fn main() {
                 .takes_value(true)
                 .min_values(1),
         )
+        .arg(
+            Arg::with_name("thread-pool-size")
+                .long("thread-pool-size")
+                .help("thread pool size (default 64)")
+                .takes_value(true)
+                .min_values(1),
+        )
+        .arg(
+            Arg::with_name("disable-xattr")
+                .long("disable-xattr")
+                .help("Disable support for extended attributes"),
+        )
         .get_matches();
 
     // Retrieve arguments
@@ -205,16 +303,24 @@ fn main() {
     let sock = cmd_arguments
         .value_of("sock")
         .expect("Failed to retrieve vhost-user socket path");
+    let thread_pool_size: usize = match cmd_arguments.value_of("thread-pool-size") {
+        Some(size) => size.parse().expect("Invalid argument for thread-pool-size"),
+        None => THREAD_POOL_SIZE,
+    };
+    let xattr: bool = !cmd_arguments.is_present("disable-xattr");
 
     // Convert into appropriate types
     let sock = String::from(sock);
 
     let fs_cfg = passthrough::Config {
         root_dir: shared_dir.to_string(),
+        xattr,
         ..Default::default()
     };
     let fs = PassthroughFs::new(fs_cfg).unwrap();
-    let fs_backend = Arc::new(RwLock::new(VhostUserFsBackend::new(fs).unwrap()));
+    let fs_backend = Arc::new(RwLock::new(
+        VhostUserFsBackend::new(fs, thread_pool_size).unwrap(),
+    ));
 
     let mut daemon = VhostUserDaemon::new(
         String::from("vhost-user-fs-backend"),
@@ -223,24 +329,17 @@ fn main() {
     )
     .unwrap();
 
-    let vring_worker = daemon.get_vring_worker();
-
-    if let Err(e) = vring_worker.register_listener(
-        fs_backend.read().unwrap().kill_evt.as_raw_fd(),
-        epoll::Events::EPOLLIN,
-        u64::from(KILL_EVENT),
-    ) {
-        println!("Failed to register listener for kill event: {:?}", e);
-        process::exit(1);
-    }
-
     if let Err(e) = daemon.start() {
-        println!("Failed to start daemon: {:?}", e);
+        error!("Failed to start daemon: {:?}", e);
         process::exit(1);
     }
 
     if let Err(e) = daemon.wait() {
-        println!("Waiting for daemon failed: {:?}", e);
+        error!("Waiting for daemon failed: {:?}", e);
-        process::exit(1);
+    }
+
+    let kill_evt = &fs_backend.read().unwrap().kill_evt;
+    if let Err(e) = kill_evt.write(1) {
+        error!("Error shutting down worker thread: {:?}", e)
     }
 }

src/bin/vhost_user_net.rs

@@ -8,536 +8,10 @@
 
 #[macro_use(crate_version, crate_authors)]
 extern crate clap;
-extern crate log;
+extern crate vhost_user_net;
-extern crate net_util;
-extern crate vhost_rs;
-extern crate vhost_user_backend;
-extern crate vm_virtio;
 
 use clap::{App, Arg};
-use epoll;
+use vhost_user_net::start_net_backend;
-use libc::{self, EAGAIN, EFD_NONBLOCK};
-use log::*;
-use std::cmp;
-use std::fmt;
-use std::io::Read;
-use std::io::{self, Write};
-use std::mem;
-use std::net::Ipv4Addr;
-use std::os::unix::io::AsRawFd;
-use std::process;
-use std::sync::{Arc, RwLock};
-use std::vec::Vec;
-
-use vhost_rs::vhost_user::message::*;
-use vhost_rs::vhost_user::Error as VhostUserError;
-use vhost_user_backend::{VhostUserBackend, VhostUserDaemon, Vring, VringWorker};
-
-use net_gen;
-
-use net_util::{Tap, TapError};
-use virtio_bindings::bindings::virtio_net::*;
-use vm_memory::{Bytes, GuestAddress, GuestMemoryMmap};
-use vmm_sys_util::eventfd::EventFd;
-
-/// The maximum buffer size when segmentation offload is enabled. This
-/// includes the 12-byte virtio net header.
-/// http://docs.oasis-open.org/virtio/virtio/v1.0/virtio-v1.0.html#x1-1740003
-const MAX_BUFFER_SIZE: usize = 65562;
-const QUEUE_SIZE: usize = 1024;
-const NUM_QUEUES: usize = 2;
-
-// The guest has made a buffer available to receive a frame into.
-const RX_QUEUE_EVENT: u16 = 0;
-// The transmit queue has a frame that is ready to send from the guest.
-const TX_QUEUE_EVENT: u16 = 1;
-// A frame is available for reading from the tap device to receive in the guest.
-const RX_TAP_EVENT: u16 = 2;
-// The device has been dropped.
-const KILL_EVENT: u16 = 3;
-
-pub type VhostUserResult<T> = std::result::Result<T, VhostUserError>;
-pub type Result<T> = std::result::Result<T, Error>;
-pub type VhostUserBackendResult<T> = std::result::Result<T, std::io::Error>;
-
-#[derive(Debug)]
-pub enum Error {
-    /// Failed to activate device.
-    BadActivate,
-    /// Failed to create kill eventfd
-    CreateKillEventFd,
-    /// Failed to add event.
-    EpollCtl(io::Error),
-    /// Fail to wait event.
-    EpollWait(io::Error),
-    /// Failed to create EventFd.
-    EpollCreateFd,
-    /// Failed to read Tap.
-    FailedReadTap,
-    /// Failed to signal used queue.
-    FailedSignalingUsedQueue,
-    /// Failed to handle event other than input event.
-    HandleEventNotEpollIn,
-    /// Failed to handle unknown event.
-    HandleEventUnknownEvent,
-    /// Invalid vring address.
-    InvalidVringAddr,
-    /// No vring call fd to notify.
-    NoVringCallFdNotify,
-    /// No memory configured.
-    NoMemoryConfigured,
-    /// Failed to parse sock parameter.
-    ParseSockParam,
-    /// Failed to parse ip parameter.
-    ParseIpParam,
-    /// Failed to parse mask parameter.
-    ParseMaskParam,
-    /// Open tap device failed.
-    TapOpen(TapError),
-    /// Setting tap IP failed.
-    TapSetIp(TapError),
-    /// Setting tap netmask failed.
-    TapSetNetmask(TapError),
-    /// Setting tap interface offload flags failed.
-    TapSetOffload(TapError),
-    /// Setting vnet header size failed.
-    TapSetVnetHdrSize(TapError),
-    /// Enabling tap interface failed.
-    TapEnable(TapError),
-}
-
-impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "vhost_user_net_error: {:?}", self)
-    }
-}
-
-impl std::error::Error for Error {}
-
-impl std::convert::From<Error> for std::io::Error {
-    fn from(e: Error) -> Self {
-        std::io::Error::new(io::ErrorKind::Other, e)
-    }
-}
-
-#[derive(Clone)]
-struct TxVirtio {
-    iovec: Vec<(GuestAddress, usize)>,
-    frame_buf: [u8; MAX_BUFFER_SIZE],
-}
-
-impl TxVirtio {
-    fn new() -> Self {
-        TxVirtio {
-            iovec: Vec::new(),
-            frame_buf: [0u8; MAX_BUFFER_SIZE],
-        }
-    }
-}
-
-#[derive(Clone)]
-struct RxVirtio {
-    deferred_frame: bool,
-    deferred_irqs: bool,
-    bytes_read: usize,
-    frame_buf: [u8; MAX_BUFFER_SIZE],
-}
-
-impl RxVirtio {
-    fn new() -> Self {
-        RxVirtio {
-            deferred_frame: false,
-            deferred_irqs: false,
-            bytes_read: 0,
-            frame_buf: [0u8; MAX_BUFFER_SIZE],
-        }
-    }
-}
-
-fn vnet_hdr_len() -> usize {
-    mem::size_of::<virtio_net_hdr_v1>()
-}
-
-struct VhostUserNetBackend {
-    mem: Option<GuestMemoryMmap>,
-    vring_worker: Option<Arc<VringWorker>>,
-    kill_evt: EventFd,
-    tap: Tap,
-    rx: RxVirtio,
-    tx: TxVirtio,
-    rx_tap_listening: bool,
-}
-
-impl std::clone::Clone for VhostUserNetBackend {
-    fn clone(&self) -> Self {
-        VhostUserNetBackend {
-            mem: self.mem.clone(),
-            vring_worker: self.vring_worker.clone(),
-            kill_evt: self.kill_evt.try_clone().unwrap(),
-            tap: self.tap.clone(),
-            rx: self.rx.clone(),
-            tx: self.tx.clone(),
-            rx_tap_listening: self.rx_tap_listening,
-        }
-    }
-}
-
-impl VhostUserNetBackend {
-    /// Create a new virtio network device with the given TAP interface.
-    pub fn new_with_tap(tap: Tap) -> Result<Self> {
-        // Set offload flags to match the virtio features below.
-        tap.set_offload(
-            net_gen::TUN_F_CSUM | net_gen::TUN_F_UFO | net_gen::TUN_F_TSO4 | net_gen::TUN_F_TSO6,
-        )
-        .map_err(Error::TapSetOffload)?;
-
-        let vnet_hdr_size = vnet_hdr_len() as i32;
-        tap.set_vnet_hdr_size(vnet_hdr_size)
-            .map_err(Error::TapSetVnetHdrSize)?;
-
-        let rx = RxVirtio::new();
-        let tx = TxVirtio::new();
-
-        Ok(VhostUserNetBackend {
-            mem: None,
-            vring_worker: None,
-            kill_evt: EventFd::new(EFD_NONBLOCK).map_err(|_| Error::CreateKillEventFd)?,
-            tap,
-            rx,
-            tx,
-            rx_tap_listening: false,
-        })
-    }
-
-    /// Create a new virtio network device with the given IP address and
-    /// netmask.
-    pub fn new(ip_addr: Ipv4Addr, netmask: Ipv4Addr) -> Result<Self> {
-        let tap = Tap::new().map_err(Error::TapOpen)?;
-        tap.set_ip_addr(ip_addr).map_err(Error::TapSetIp)?;
-        tap.set_netmask(netmask).map_err(Error::TapSetNetmask)?;
-        tap.enable().map_err(Error::TapEnable)?;
-
-        Self::new_with_tap(tap)
-    }
-
-    // Copies a single frame from `self.rx.frame_buf` into the guest. Returns true
-    // if a buffer was used, and false if the frame must be deferred until a buffer
-    // is made available by the driver.
-    fn rx_single_frame(&mut self, vring: &mut Vring) -> Result<bool> {
-        let mem = self.mem.as_ref().ok_or(Error::NoMemoryConfigured)?;
-
-        let mut next_desc = vring.mut_queue().iter(&mem).next();
-
-        if next_desc.is_none() {
-            // Queue has no available descriptors
-            if self.rx_tap_listening {
-                self.vring_worker
-                    .as_ref()
-                    .unwrap()
-                    .unregister_listener(
-                        self.tap.as_raw_fd(),
-                        epoll::Events::EPOLLIN,
-                        u64::from(RX_TAP_EVENT),
-                    )
-                    .unwrap();
-                self.rx_tap_listening = false;
-            }
-            return Ok(false);
-        }
-
-        // We just checked that the head descriptor exists.
-        let head_index = next_desc.as_ref().unwrap().index;
-        let mut write_count = 0;
-
-        // Copy from frame into buffer, which may span multiple descriptors.
-        loop {
-            match next_desc {
-                Some(desc) => {
-                    if !desc.is_write_only() {
-                        break;
-                    }
-                    let limit = cmp::min(write_count + desc.len as usize, self.rx.bytes_read);
-                    let source_slice = &self.rx.frame_buf[write_count..limit];
-                    let write_result = mem.write_slice(source_slice, desc.addr);
-
-                    match write_result {
-                        Ok(_) => {
-                            write_count = limit;
-                        }
-                        Err(e) => {
-                            error!("Failed to write slice: {:?}", e);
-                            break;
-                        }
-                    };
-
-                    if write_count >= self.rx.bytes_read {
-                        break;
-                    }
-                    next_desc = desc.next_descriptor();
-                }
-                None => {
-                    warn!("Receiving buffer is too small to hold frame of current size");
-                    break;
-                }
-            }
-        }
-
-        vring
-            .mut_queue()
-            .add_used(&mem, head_index, write_count as u32);
-
-        // Mark that we have at least one pending packet and we need to interrupt the guest.
-        self.rx.deferred_irqs = true;
-
-        Ok(write_count >= self.rx.bytes_read)
-    }
-
-    fn process_rx(&mut self, vring: &mut Vring) -> Result<()> {
-        // Read as many frames as possible.
-        loop {
-            match self.read_tap() {
-                Ok(count) => {
-                    self.rx.bytes_read = count;
-                    if !self.rx_single_frame(vring)? {
-                        self.rx.deferred_frame = true;
-                        break;
-                    }
-                }
-                Err(e) => {
-                    // The tap device is non-blocking, so any error aside from EAGAIN is
-                    // unexpected.
-                    match e.raw_os_error() {
-                        Some(err) if err == EAGAIN => (),
-                        _ => {
-                            error!("Failed to read tap: {:?}", e);
-                            return Err(Error::FailedReadTap);
-                        }
-                    };
-                    break;
-                }
-            }
-        }
-        if self.rx.deferred_irqs {
-            self.rx.deferred_irqs = false;
-            vring.signal_used_queue().unwrap();
-            Ok(())
-        } else {
-            Ok(())
-        }
-    }
-
-    fn resume_rx(&mut self, vring: &mut Vring) -> Result<()> {
-        if self.rx.deferred_frame {
-            if self.rx_single_frame(vring)? {
-                self.rx.deferred_frame = false;
-                // process_rx() was interrupted possibly before consuming all
-                // packets in the tap; try continuing now.
-                self.process_rx(vring)
-            } else if self.rx.deferred_irqs {
-                self.rx.deferred_irqs = false;
-                vring.signal_used_queue().unwrap();
-                Ok(())
-            } else {
-                Ok(())
-            }
-        } else {
-            Ok(())
-        }
-    }
-
-    fn process_tx(&mut self, vring: &mut Vring) -> Result<()> {
-        let mem = self.mem.as_ref().ok_or(Error::NoMemoryConfigured)?;
-
-        let mut used_desc_heads = [(0, 0); QUEUE_SIZE];
-        let mut used_count = 0;
-        while let Some(avail_desc) = vring.mut_queue().iter(&mem).next() {
-            let head_index = avail_desc.index;
-            let mut read_count = 0;
-            let mut next_desc = Some(avail_desc);
-
-            self.tx.iovec.clear();
-            while let Some(desc) = next_desc {
-                if desc.is_write_only() {
-                    break;
-                }
-                self.tx.iovec.push((desc.addr, desc.len as usize));
-                read_count += desc.len as usize;
-                next_desc = desc.next_descriptor();
-            }
-            used_desc_heads[used_count] = (head_index, read_count);
-            used_count += 1;
-            read_count = 0;
-            // Copy buffer from across multiple descriptors.
-            // TODO(performance - Issue #420): change this to use `writev()` instead of `write()`
-            // and get rid of the intermediate buffer.
-            for (desc_addr, desc_len) in self.tx.iovec.drain(..) {
-                let limit = cmp::min((read_count + desc_len) as usize, self.tx.frame_buf.len());
-
-                let read_result = mem.read_slice(
-                    &mut self.tx.frame_buf[read_count..limit as usize],
-                    desc_addr,
-                );
-                match read_result {
-                    Ok(_) => {
-                        // Increment by number of bytes actually read
-                        read_count += limit - read_count;
-                    }
-                    Err(e) => {
-                        error!("Failed to read slice: {:?}", e);
-                        break;
-                    }
-                }
-            }
-
-            let write_result = self.tap.write(&self.tx.frame_buf[..read_count as usize]);
-            match write_result {
-                Ok(_) => {}
-                Err(e) => {
-                    error!("net: tx: error failed to write to tap: {}", e);
-                }
-            };
-        }
-
-        if used_count > 0 {
-            for &(desc_index, _) in &used_desc_heads[..used_count] {
-                vring.mut_queue().add_used(&mem, desc_index, 0);
-            }
-            vring.signal_used_queue().unwrap();
-        }
-
-        Ok(())
-    }
-
-    fn read_tap(&mut self) -> io::Result<usize> {
-        self.tap.read(&mut self.rx.frame_buf)
-    }
-}
-
-impl VhostUserBackend for VhostUserNetBackend {
-    fn num_queues(&self) -> usize {
-        NUM_QUEUES
-    }
-
-    fn max_queue_size(&self) -> usize {
-        QUEUE_SIZE
-    }
-
-    fn features(&self) -> u64 {
-        1 << VIRTIO_NET_F_GUEST_CSUM
-            | 1 << VIRTIO_NET_F_CSUM
-            | 1 << VIRTIO_NET_F_GUEST_TSO4
-            | 1 << VIRTIO_NET_F_GUEST_UFO
-            | 1 << VIRTIO_NET_F_HOST_TSO4
-            | 1 << VIRTIO_NET_F_HOST_UFO
-            | 1 << VIRTIO_F_VERSION_1
-            | VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits()
-    }
-
-    fn protocol_features(&self) -> VhostUserProtocolFeatures {
-        VhostUserProtocolFeatures::all()
-    }
-
-    fn update_memory(&mut self, mem: GuestMemoryMmap) -> VhostUserBackendResult<()> {
-        self.mem = Some(mem);
-        Ok(())
-    }
-
-    fn handle_event(
-        &mut self,
-        device_event: u16,
-        evset: epoll::Events,
-        vrings: &[Arc<RwLock<Vring>>],
-    ) -> VhostUserBackendResult<bool> {
-        if evset != epoll::Events::EPOLLIN {
-            return Err(Error::HandleEventNotEpollIn.into());
-        }
-
-        match device_event {
-            RX_QUEUE_EVENT => {
-                let mut vring = vrings[0].write().unwrap();
-                self.resume_rx(&mut vring)?;
-
-                if !self.rx_tap_listening {
-                    self.vring_worker.as_ref().unwrap().register_listener(
-                        self.tap.as_raw_fd(),
-                        epoll::Events::EPOLLIN,
-                        u64::from(RX_TAP_EVENT),
-                    )?;
-                    self.rx_tap_listening = true;
-                }
-            }
-            TX_QUEUE_EVENT => {
-                let mut vring = vrings[1].write().unwrap();
-                self.process_tx(&mut vring)?;
-            }
-            RX_TAP_EVENT => {
-                let mut vring = vrings[0].write().unwrap();
-                if self.rx.deferred_frame
-                // Process a deferred frame first if available. Don't read from tap again
-                // until we manage to receive this deferred frame.
-                {
-                    if self.rx_single_frame(&mut vring)? {
-                        self.rx.deferred_frame = false;
-                        self.process_rx(&mut vring)?;
-                    } else if self.rx.deferred_irqs {
-                        self.rx.deferred_irqs = false;
-                        vring.signal_used_queue()?;
-                    }
-                } else {
-                    self.process_rx(&mut vring)?;
-                }
-            }
-            KILL_EVENT => {
-                self.kill_evt.read().unwrap();
-                return Ok(true);
-            }
-            _ => return Err(Error::HandleEventUnknownEvent.into()),
-        }
-
-        Ok(false)
-    }
-}
-
-pub struct VhostUserNetBackendConfig<'a> {
-    pub ip: Ipv4Addr,
-    pub mask: Ipv4Addr,
-    pub sock: &'a str,
-}
-
-impl<'a> VhostUserNetBackendConfig<'a> {
-    pub fn parse(backend: &'a str) -> Result<Self> {
-        let params_list: Vec<&str> = backend.split(',').collect();
-
-        let mut ip_str: &str = "";
-        let mut mask_str: &str = "";
-        let mut sock: &str = "";
-
-        for param in params_list.iter() {
-            if param.starts_with("ip=") {
-                ip_str = &param[3..];
-            } else if param.starts_with("mask=") {
-                mask_str = &param[5..];
-            } else if param.starts_with("sock=") {
-                sock = &param[5..];
-            }
-        }
-
-        let mut ip: Ipv4Addr = Ipv4Addr::new(192, 168, 100, 1);
-        let mut mask: Ipv4Addr = Ipv4Addr::new(255, 255, 255, 0);
-
-        if sock.is_empty() {
-            return Err(Error::ParseSockParam);
-        }
-        if !ip_str.is_empty() {
-            ip = ip_str.parse().map_err(|_| Error::ParseIpParam)?;
-        }
-        if !mask_str.is_empty() {
-            mask = mask_str.parse().map_err(|_| Error::ParseMaskParam)?;
-        }
-
-        Ok(VhostUserNetBackendConfig { ip, mask, sock })
-    }
-}
 
 fn main() {
     let cmd_arguments = App::new("vhost-user-net backend")
@@ -545,57 +19,18 @@ fn main() {
         .author(crate_authors!())
         .about("Launch a vhost-user-net backend.")
         .arg(
-            Arg::with_name("backend")
+            Arg::with_name("net-backend")
-                .long("backend")
+                .long("net-backend")
                 .help(
-                    "Backend parameters \"ip=<ip_addr>,\
+                    "vhost-user-net backend parameters \
-                     mask=<net_mask>,sock=<socket_path>\"",
+                     \"ip=<ip_addr>,mask=<net_mask>,sock=<socket_path>,\
+                     num_queues=<number_of_queues>,queue_size=<size_of_each_queue>,tap=<if_name>\"",
                 )
                 .takes_value(true)
                 .min_values(1),
         )
         .get_matches();
 
-    let vhost_user_net_backend = cmd_arguments.value_of("backend").unwrap();
+    let backend_command = cmd_arguments.value_of("net-backend").unwrap();
-
+    start_net_backend(backend_command);
-    let backend_config = match VhostUserNetBackendConfig::parse(vhost_user_net_backend) {
-        Ok(config) => config,
-        Err(e) => {
-            println!("Failed parsing parameters {:?}", e);
-            process::exit(1);
-        }
-    };
-
-    let net_backend = Arc::new(RwLock::new(
-        VhostUserNetBackend::new(backend_config.ip, backend_config.mask).unwrap(),
-    ));
-    let name = "vhost-user-net-backend";
-    let mut net_daemon = VhostUserDaemon::new(
-        name.to_string(),
-        backend_config.sock.to_string(),
-        net_backend.clone(),
-    )
-    .unwrap();
-    let vring_worker = net_daemon.get_vring_worker();
-
-    if let Err(e) = vring_worker.register_listener(
-        net_backend.read().unwrap().kill_evt.as_raw_fd(),
-        epoll::Events::EPOLLIN,
-        u64::from(KILL_EVENT),
-    ) {
-        println!("failed to register listener for kill event: {:?}", e);
-        process::exit(1);
-    }
-
-    net_backend.write().unwrap().vring_worker = Some(vring_worker);
-
-    if let Err(e) = net_daemon.start() {
-        println!(
-            "failed to start daemon for vhost-user-net with error: {:?}",
-            e
-        );
-        process::exit(1);
-    }
-
-    net_daemon.wait().unwrap();
 }

test_data/cloud-init/clear/openstack/latest/user_data

@@ -38,6 +38,17 @@ write_files:
         Address=192.168.2.4/24
         Gateway=192.168.2.1
 
+  -
+    path: /etc/systemd/network/00-static-l2-3.network
+    permissions: 0644
+    content: |
+        [Match]
+        MACAddress=de:ad:be:ef:56:78
+
+        [Network]
+        Address=192.168.2.5/24
+        Gateway=192.168.2.1
+
   -
     path: /etc/systemd/system/vfio.service
     permissions: 0644
@@ -58,10 +69,12 @@ write_files:
     content: |
         #!/bin/bash
 
-        mount -t virtio_fs virtiofs /mnt -o rootmode=040000,user_id=0,group_id=0,dax
+        mount -t virtiofs -o dax myfs /mnt
         bash -c "echo 0000:00:05.0 > /sys/bus/pci/devices/0000\:00\:05.0/driver/unbind"
         bash -c "echo 1af4 1041 > /sys/bus/pci/drivers/vfio-pci/new_id"
         bash -c "echo 0000:00:06.0 > /sys/bus/pci/devices/0000\:00\:06.0/driver/unbind"
         bash -c "echo 1af4 1041 > /sys/bus/pci/drivers/vfio-pci/new_id"
-
+        # 512M ram requires 256 pages
-        /mnt/cloud-hypervisor --kernel /mnt/vmlinux --cmdline "console=hvc0 reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=/dev/vda2 VFIOTAG" --disk path=/mnt/clear-31310-cloudguest.img path=/mnt/cloudinit.img --cpus 1 --memory size=512M --rng --device path=/sys/bus/pci/devices/0000:00:05.0/ path=/sys/bus/pci/devices/0000:00:06.0/
+        echo 256 | sudo tee /proc/sys/vm/nr_hugepages
+        sudo chmod a+rwX /dev/hugepages
+        /mnt/cloud-hypervisor --kernel /mnt/vmlinux --cmdline "console=hvc0 reboot=k panic=1 nomodules i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd root=PARTUUID=6fb4d1a8-6c8c-4dd7-9f7c-1fe0b9f2574c VFIOTAG" --disk path=/mnt/clear-31311-cloudguest.img path=/mnt/cloudinit.img --cpus boot=1 --memory size=512M,file=/dev/hugepages --device path=/sys/bus/pci/devices/0000:00:05.0/ path=/sys/bus/pci/devices/0000:00:06.0/ --api-socket /tmp/ch_api.sock

vfio/Cargo.toml

@@ -4,18 +4,19 @@ version = "0.0.1"
 authors = ["The Cloud Hypervisor Authors"]
 
 [dependencies]
-byteorder = "1.3.2"
+arc-swap = ">=0.4.4"
+byteorder = "1.3.4"
 devices = { path = "../devices" }
 kvm-bindings = "0.2.0"
-kvm-ioctls = "0.4.0"
+kvm-ioctls = "0.5.0"
-libc = "0.2.60"
+libc = "0.2.68"
 log = "0.4.8"
 pci = { path = "../pci" }
-vfio-bindings = "0.1.0"
 vm-allocator = { path = "../vm-allocator" }
 vm-device = { path = "../vm-device" }
+vm-memory = { version = "0.1.0", features = ["backend-mmap"] }
 vmm-sys-util = ">=0.3.1"
 
-[dependencies.vm-memory]
+[dependencies.vfio-bindings]
-git = "https://github.com/rust-vmm/vm-memory"
+git = "https://github.com/rust-vmm/vfio-bindings"
-features = ["backend-mmap"]
+features = ["fam-wrappers"]

vfio/src/lib.rs

@@ -5,6 +5,7 @@
 
 //#![deny(missing_docs)]
 //! Virtual Function I/O (VFIO) API
+extern crate arc_swap;
 extern crate byteorder;
 extern crate devices;
 extern crate kvm_bindings;

vfio/src/vfio_device.rs

@@ -12,17 +12,23 @@ use std::fmt;
 use std::fs::{File, OpenOptions};
 use std::io;
 use std::mem;
+use std::num;
 use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
 use std::os::unix::prelude::FileExt;
 use std::path::{Path, PathBuf};
 use std::result;
-use std::sync::{Arc, RwLock};
+use std::sync::Arc;
 use std::u32;
 use vfio_bindings::bindings::vfio::*;
+use vfio_bindings::bindings::IrqSet;
 use vfio_ioctls::*;
 use vm_device::{get_host_address_range, ExternalDmaMapping};
-use vm_memory::{Address, GuestAddress, GuestMemory, GuestMemoryMmap, GuestMemoryRegion};
+use vm_memory::{
+    Address, GuestAddress, GuestAddressSpace, GuestMemory, GuestMemoryAtomic, GuestMemoryMmap,
+    GuestMemoryRegion,
+};
 use vmm_sys_util::eventfd::EventFd;
+use vmm_sys_util::fam::FamStruct;
 use vmm_sys_util::ioctl::*;
 
 #[derive(Debug)]
@@ -47,6 +53,9 @@ pub enum VfioError {
     IommuDmaUnmap,
     VfioDeviceGetIrqInfo,
     VfioDeviceSetIrq,
+    VfioNoIommuGroup(String),
+    ReadLink(io::Error),
+    ParseInt(num::ParseIntError),
 }
 pub type Result<T> = std::result::Result<T, VfioError>;
 
@@ -95,6 +104,9 @@ impl fmt::Display for VfioError {
             }
             VfioError::VfioDeviceGetIrqInfo => write!(f, "failed to get vfio device irq info"),
             VfioError::VfioDeviceSetIrq => write!(f, "failed to set vfio deviece irq"),
+            VfioError::ReadLink(e) => write!(f, "failed to read link from path: {}", e),
+            VfioError::VfioNoIommuGroup(e) => write!(f, "Failed to find iommu_group for: {}", e),
+            VfioError::ParseInt(e) => write!(f, "failed to parse integer: {}", e),
         }
     }
 }
@@ -436,7 +448,7 @@ impl VfioDeviceInfo {
                 ioctl_with_mut_ref(&self.device, VFIO_DEVICE_GET_REGION_INFO(), &mut reg_info)
             };
             if ret < 0 {
-                error!("Could not get region #{} info", i);
+                warn!("Could not get region #{} info", i);
                 continue;
             }
 
@@ -462,7 +474,7 @@ impl VfioDeviceInfo {
                     )
                 };
                 if ret < 0 {
-                    error!("Could not get region #{} info", i);
+                    warn!("Could not get region #{} info", i);
                     continue;
                 }
                 // region_with_cap[0].cap_info may contain vfio_region_info_cap_sparse_mmap
@@ -514,11 +526,11 @@ impl VfioDeviceInfo {
 /// associated with a specific VFIO container.
 pub struct VfioDmaMapping {
     container: Arc<VfioContainer>,
-    memory: Arc<RwLock<GuestMemoryMmap>>,
+    memory: GuestMemoryAtomic<GuestMemoryMmap>,
 }
 
 impl VfioDmaMapping {
-    pub fn new(container: Arc<VfioContainer>, memory: Arc<RwLock<GuestMemoryMmap>>) -> Self {
+    pub fn new(container: Arc<VfioContainer>, memory: GuestMemoryAtomic<GuestMemoryMmap>) -> Self {
         VfioDmaMapping { container, memory }
     }
 }
@@ -526,7 +538,7 @@ impl VfioDmaMapping {
 impl ExternalDmaMapping for VfioDmaMapping {
     fn map(&self, iova: u64, gpa: u64, size: u64) -> result::Result<(), io::Error> {
         let user_addr = if let Some(addr) = get_host_address_range(
-            &self.memory.read().unwrap(),
+            &self.memory.memory(),
             GuestAddress(gpa),
             size.try_into().unwrap(),
         ) {
@@ -577,7 +589,7 @@ pub struct VfioDevice {
     group: VfioGroup,
     regions: Vec<VfioRegion>,
     irqs: HashMap<u32, VfioIrq>,
-    mem: Arc<RwLock<GuestMemoryMmap>>,
+    mem: GuestMemoryAtomic<GuestMemoryMmap>,
     iommu_attached: bool,
 }
 
@@ -588,16 +600,19 @@ impl VfioDevice {
     pub fn new(
         sysfspath: &Path,
         device_fd: Arc<DeviceFd>,
-        mem: Arc<RwLock<GuestMemoryMmap>>,
+        mem: GuestMemoryAtomic<GuestMemoryMmap>,
         iommu_attached: bool,
     ) -> Result<Self> {
         let uuid_path: PathBuf = [sysfspath, Path::new("iommu_group")].iter().collect();
-        let group_path = uuid_path.read_link().map_err(|_| VfioError::InvalidPath)?;
+        if !uuid_path.exists() {
+            return Err(VfioError::VfioNoIommuGroup(
+                uuid_path.to_str().unwrap().to_string(),
+            ));
+        }
+        let group_path = uuid_path.read_link().map_err(VfioError::ReadLink)?;
         let group_osstr = group_path.file_name().ok_or(VfioError::InvalidPath)?;
         let group_str = group_osstr.to_str().ok_or(VfioError::InvalidPath)?;
-        let group_id = group_str
+        let group_id = group_str.parse::<u32>().map_err(VfioError::ParseInt)?;
-            .parse::<u32>()
-            .map_err(|_| VfioError::InvalidPath)?;
 
         let group = VfioGroup::new(group_id, device_fd)?;
         let device_info = group.get_device(sysfspath)?;
@@ -641,34 +656,25 @@ impl VfioDevice {
             return Err(VfioError::VfioDeviceSetIrq);
         }
 
-        let mut irq_set = vec_with_array_field::<vfio_irq_set, u32>(event_fds.len());
+        let mut irq_set_wrapper = IrqSet::new(event_fds.len() * mem::size_of::<u32>());
-        irq_set[0].argsz = mem::size_of::<vfio_irq_set>() as u32
+        let mut irq_set = irq_set_wrapper.as_mut_fam_struct();
-            + (event_fds.len() * mem::size_of::<u32>()) as u32;
+        let fds = irq_set.as_mut_slice();
-        irq_set[0].flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
-        irq_set[0].index = irq_index;
-        irq_set[0].start = 0;
-        irq_set[0].count = irq.count;
 
-        {
+        for (index, event_fd) in event_fds.iter().enumerate() {
-            // irq_set.data could be none, bool or fd according to flags, so irq_set.data
+            let fds_offset = index * mem::size_of::<u32>();
-            // is u8 default, here irq_set.data is a vector of fds as u32, so 4 default u8
+            let fd = &mut fds[fds_offset..fds_offset + mem::size_of::<u32>()];
-            // are combined together as u32 for each fd.
+            LittleEndian::write_u32(fd, event_fd.as_raw_fd() as u32);
-            // It is safe as enough space is reserved through
-            // vec_with_array_field(u32)<event_fds.len()>.
-            let fds = unsafe {
-                irq_set[0]
-                    .data
-                    .as_mut_slice(event_fds.len() * mem::size_of::<u32>())
-            };
-            for (index, event_fd) in event_fds.iter().enumerate() {
-                let fds_offset = index * mem::size_of::<u32>();
-                let fd = &mut fds[fds_offset..fds_offset + mem::size_of::<u32>()];
-                LittleEndian::write_u32(fd, event_fd.as_raw_fd() as u32);
-            }
         }
 
+        irq_set.argsz = mem::size_of::<vfio_irq_set>() as u32
+            + (event_fds.len() * mem::size_of::<u32>()) as u32;
+        irq_set.flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
+        irq_set.index = irq_index;
+        irq_set.start = 0;
+        irq_set.count = irq.count;
+
         // Safe as we are the owner of self and irq_set which are valid value
-        let ret = unsafe { ioctl_with_ref(self, VFIO_DEVICE_SET_IRQS(), &irq_set[0]) };
+        let ret = unsafe { ioctl_with_ref(self, VFIO_DEVICE_SET_IRQS(), irq_set) };
         if ret < 0 {
             return Err(VfioError::VfioDeviceSetIrq);
         }
@@ -845,7 +851,7 @@ impl VfioDevice {
     /// then vfio kernel driver could access guest memory from gfn
     pub fn setup_dma_map(&self) -> Result<()> {
         if !self.iommu_attached {
-            self.mem.read().unwrap().with_regions(|_index, region| {
+            self.mem.memory().with_regions(|_index, region| {
                 self.vfio_dma_map(
                     region.start_addr().raw_value(),
                     region.len() as u64,
@@ -860,7 +866,7 @@ impl VfioDevice {
     /// then vfio kernel driver couldn't access this guest memory
     pub fn unset_dma_map(&self) -> Result<()> {
         if !self.iommu_attached {
-            self.mem.read().unwrap().with_regions(|_index, region| {
+            self.mem.memory().with_regions(|_index, region| {
                 self.vfio_dma_unmap(region.start_addr().raw_value(), region.len() as u64)
             })?;
         }

vfio/src/vfio_pci.rs

@@ -7,27 +7,26 @@ extern crate devices;
 extern crate pci;
 extern crate vm_allocator;
 
-use crate::vec_with_array_field;
 use crate::vfio_device::VfioDevice;
 use byteorder::{ByteOrder, LittleEndian};
 use devices::BusDevice;
-use kvm_bindings::{
+use kvm_bindings::kvm_userspace_memory_region;
-    kvm_irq_routing, kvm_irq_routing_entry, kvm_userspace_memory_region, KVM_IRQ_ROUTING_MSI,
-};
 use kvm_ioctls::*;
 use pci::{
-    BarReprogrammingParams, MsiCap, MsixCap, MsixConfig, PciBarConfiguration, PciBarRegionType,
+    msi_num_enabled_vectors, BarReprogrammingParams, MsiConfig, MsixCap, MsixConfig,
-    PciCapabilityID, PciClassCode, PciConfiguration, PciDevice, PciDeviceError, PciHeaderType,
+    PciBarConfiguration, PciBarRegionType, PciCapabilityID, PciClassCode, PciConfiguration,
-    PciSubclass, MSIX_TABLE_ENTRY_SIZE,
+    PciDevice, PciDeviceError, PciHeaderType, PciSubclass, MSIX_TABLE_ENTRY_SIZE,
 };
 use std::any::Any;
-use std::collections::HashMap;
 use std::os::unix::io::AsRawFd;
 use std::ptr::null_mut;
-use std::sync::{Arc, Mutex};
+use std::sync::Arc;
 use std::{fmt, io, result};
 use vfio_bindings::bindings::vfio::*;
 use vm_allocator::SystemAllocator;
+use vm_device::interrupt::{
+    InterruptIndex, InterruptManager, InterruptSourceGroup, MsiIrqGroupConfig,
+};
 use vm_memory::{Address, GuestAddress, GuestUsize};
 use vmm_sys_util::eventfd::EventFd;
 
@@ -35,12 +34,15 @@ use vmm_sys_util::eventfd::EventFd;
 pub enum VfioPciError {
     AllocateGsi,
     EventFd(io::Error),
+    InterruptSourceGroupCreate(io::Error),
     IrqFd(kvm_ioctls::Error),
     NewVfioPciDevice,
     MapRegionGuest(kvm_ioctls::Error),
     SetGsiRouting(kvm_ioctls::Error),
     MsiNotConfigured,
     MsixNotConfigured,
+    UpdateMsiEventFd,
+    UpdateMsixEventFd,
 }
 pub type Result<T> = std::result::Result<T, VfioPciError>;
 
@@ -49,6 +51,9 @@ impl fmt::Display for VfioPciError {
         match self {
             VfioPciError::AllocateGsi => write!(f, "failed to allocate GSI"),
             VfioPciError::EventFd(e) => write!(f, "failed to create eventfd: {}", e),
+            VfioPciError::InterruptSourceGroupCreate(e) => {
+                write!(f, "failed to create interrupt source group: {}", e)
+            }
             VfioPciError::IrqFd(e) => write!(f, "failed to register irqfd: {}", e),
             VfioPciError::NewVfioPciDevice => write!(f, "failed to create VFIO PCI device"),
             VfioPciError::MapRegionGuest(e) => {
@@ -57,6 +62,8 @@ impl fmt::Display for VfioPciError {
             VfioPciError::SetGsiRouting(e) => write!(f, "failed to set GSI routes for KVM: {}", e),
             VfioPciError::MsiNotConfigured => write!(f, "MSI interrupt not yet configured"),
             VfioPciError::MsixNotConfigured => write!(f, "MSI-X interrupt not yet configured"),
+            VfioPciError::UpdateMsiEventFd => write!(f, "failed to update MSI eventfd"),
+            VfioPciError::UpdateMsixEventFd => write!(f, "failed to update MSI-X eventfd"),
         }
     }
 }
@@ -79,19 +86,19 @@ enum InterruptUpdateAction {
     DisableMsix,
 }
 
-#[derive(Copy, Clone)]
 struct VfioMsi {
-    cap: MsiCap,
+    cfg: MsiConfig,
     cap_offset: u32,
+    interrupt_source_group: Arc<Box<dyn InterruptSourceGroup>>,
 }
 
 impl VfioMsi {
     fn update(&mut self, offset: u64, data: &[u8]) -> Option<InterruptUpdateAction> {
-        let old_enabled = self.cap.enabled();
+        let old_enabled = self.cfg.enabled();
 
-        self.cap.update(offset, data);
+        self.cfg.update(offset, data);
 
-        let new_enabled = self.cap.enabled();
+        let new_enabled = self.cfg.enabled();
 
         if !old_enabled && new_enabled {
             return Some(InterruptUpdateAction::EnableMsi);
@@ -109,18 +116,19 @@ struct VfioMsix {
     bar: MsixConfig,
     cap: MsixCap,
     cap_offset: u32,
+    interrupt_source_group: Arc<Box<dyn InterruptSourceGroup>>,
 }
 
 impl VfioMsix {
     fn update(&mut self, offset: u64, data: &[u8]) -> Option<InterruptUpdateAction> {
-        let old_enabled = self.cap.enabled();
+        let old_enabled = self.bar.enabled();
 
         // Update "Message Control" word
         if offset == 2 && data.len() == 2 {
-            self.cap.set_msg_ctl(LittleEndian::read_u16(data));
+            self.bar.set_msg_ctl(LittleEndian::read_u16(data));
         }
 
-        let new_enabled = self.cap.enabled();
+        let new_enabled = self.bar.enabled();
 
         if !old_enabled && new_enabled {
             return Some(InterruptUpdateAction::EnableMsix);
@@ -169,7 +177,7 @@ impl Interrupt {
     fn accessed(&self, offset: u64) -> Option<(PciCapabilityID, u64)> {
         if let Some(msi) = &self.msi {
             if offset >= u64::from(msi.cap_offset)
-                && offset < u64::from(msi.cap_offset) + msi.cap.size()
+                && offset < u64::from(msi.cap_offset) + msi.cfg.size()
             {
                 return Some((
                     PciCapabilityID::MessageSignalledInterrupts,
@@ -210,34 +218,11 @@ impl Interrupt {
     }
 }
 
-struct InterruptRoute {
-    gsi: u32,
-    irq_fd: EventFd,
-}
-
-impl InterruptRoute {
-    fn new(allocator: &mut SystemAllocator) -> Result<Self> {
-        let irq_fd = EventFd::new(libc::EFD_NONBLOCK).map_err(VfioPciError::EventFd)?;
-        let gsi = allocator.allocate_gsi().ok_or(VfioPciError::AllocateGsi)?;
-
-        Ok(InterruptRoute { gsi, irq_fd })
-    }
-
-    fn enable(&self, vm: &Arc<VmFd>) -> Result<()> {
-        vm.register_irqfd(&self.irq_fd, self.gsi)
-            .map_err(VfioPciError::IrqFd)
-    }
-
-    fn disable(&self, vm: &Arc<VmFd>) -> Result<()> {
-        vm.unregister_irqfd(&self.irq_fd, self.gsi)
-            .map_err(VfioPciError::IrqFd)
-    }
-}
-
 #[derive(Copy, Clone)]
 struct MmioRegion {
     start: GuestAddress,
     length: GuestUsize,
+    type_: PciBarRegionType,
     index: u32,
     mem_slot: Option<u32>,
     host_addr: Option<u64>,
@@ -297,17 +282,14 @@ pub struct VfioPciDevice {
     configuration: PciConfiguration,
     mmio_regions: Vec<MmioRegion>,
     interrupt: Interrupt,
-    interrupt_routes: Vec<InterruptRoute>,
-    gsi_msi_routes: Arc<Mutex<HashMap<u32, kvm_irq_routing_entry>>>,
 }
 
 impl VfioPciDevice {
     /// Constructs a new Vfio Pci device for the given Vfio device
     pub fn new(
         vm_fd: &Arc<VmFd>,
-        allocator: &mut SystemAllocator,
         device: VfioDevice,
-        gsi_msi_routes: Arc<Mutex<HashMap<u32, kvm_irq_routing_entry>>>,
+        interrupt_manager: &Arc<dyn InterruptManager<GroupConfig = MsiIrqGroupConfig>>,
     ) -> Result<Self> {
         let device = Arc::new(device);
         device.reset();
@@ -336,65 +318,18 @@ impl VfioPciDevice {
                 msi: None,
                 msix: None,
             },
-            interrupt_routes: Vec::new(),
-            gsi_msi_routes,
         };
 
-        vfio_pci_device.parse_capabilities();
+        vfio_pci_device.parse_capabilities(interrupt_manager);
-
-        // Allocate temporary interrupt routes for now.
-        // The MSI vectors will be filled when the guest driver programs the device.
-        let max_interrupts = vfio_pci_device.device.max_interrupts();
-        for _ in 0..max_interrupts {
-            let route = InterruptRoute::new(allocator)?;
-            vfio_pci_device.interrupt_routes.push(route);
-        }
 
         Ok(vfio_pci_device)
     }
 
-    fn enable_irq_fds(&self) -> Result<Vec<&EventFd>> {
+    fn parse_msix_capabilities(
-        let mut irq_fds: Vec<&EventFd> = Vec::new();
+        &mut self,
-
+        cap: u8,
-        for r in &self.interrupt_routes {
+        interrupt_manager: &Arc<dyn InterruptManager<GroupConfig = MsiIrqGroupConfig>>,
-            r.enable(&self.vm_fd)?;
+    ) {
-            irq_fds.push(&r.irq_fd);
-        }
-
-        Ok(irq_fds)
-    }
-
-    fn disable_irq_fds(&self) -> Result<()> {
-        for r in &self.interrupt_routes {
-            r.disable(&self.vm_fd)?;
-        }
-
-        Ok(())
-    }
-
-    fn set_kvm_routes(&self) -> Result<()> {
-        let mut entry_vec: Vec<kvm_irq_routing_entry> = Vec::new();
-        for (_, entry) in self.gsi_msi_routes.lock().unwrap().iter() {
-            entry_vec.push(*entry);
-        }
-
-        let mut irq_routing =
-            vec_with_array_field::<kvm_irq_routing, kvm_irq_routing_entry>(entry_vec.len());
-        irq_routing[0].nr = entry_vec.len() as u32;
-        irq_routing[0].flags = 0;
-
-        unsafe {
-            let entries: &mut [kvm_irq_routing_entry] =
-                irq_routing[0].entries.as_mut_slice(entry_vec.len());
-            entries.copy_from_slice(&entry_vec);
-        }
-
-        self.vm_fd
-            .set_gsi_routing(&irq_routing[0])
-            .map_err(VfioPciError::SetGsiRouting)
-    }
-
-    fn parse_msix_capabilities(&mut self, cap: u8) {
         let msg_ctl = self
             .vfio_pci_configuration
             .read_config_word((cap + 2).into());
@@ -412,30 +347,53 @@ impl VfioPciDevice {
             table,
             pba,
         };
-        let msix_config = MsixConfig::new(msix_cap.table_size());
+
+        let interrupt_source_group = interrupt_manager
+            .create_group(MsiIrqGroupConfig {
+                base: 0,
+                count: msix_cap.table_size() as InterruptIndex,
+            })
+            .unwrap();
+
+        let msix_config = MsixConfig::new(msix_cap.table_size(), interrupt_source_group.clone());
 
         self.interrupt.msix = Some(VfioMsix {
             bar: msix_config,
             cap: msix_cap,
             cap_offset: cap.into(),
+            interrupt_source_group,
         });
     }
 
-    fn parse_msi_capabilities(&mut self, cap: u8) {
+    fn parse_msi_capabilities(
+        &mut self,
+        cap: u8,
+        interrupt_manager: &Arc<dyn InterruptManager<GroupConfig = MsiIrqGroupConfig>>,
+    ) {
         let msg_ctl = self
             .vfio_pci_configuration
             .read_config_word((cap + 2).into());
 
+        let interrupt_source_group = interrupt_manager
+            .create_group(MsiIrqGroupConfig {
+                base: 0,
+                count: msi_num_enabled_vectors(msg_ctl) as InterruptIndex,
+            })
+            .unwrap();
+
+        let msi_config = MsiConfig::new(msg_ctl, interrupt_source_group.clone());
+
         self.interrupt.msi = Some(VfioMsi {
-            cap: MsiCap {
+            cfg: msi_config,
-                msg_ctl,
-                ..Default::default()
-            },
             cap_offset: cap.into(),
+            interrupt_source_group,
         });
     }
 
-    fn parse_capabilities(&mut self) {
+    fn parse_capabilities(
+        &mut self,
+        interrupt_manager: &Arc<dyn InterruptManager<GroupConfig = MsiIrqGroupConfig>>,
+    ) {
         let mut cap_next = self
             .vfio_pci_configuration
             .read_config_byte(PCI_CONFIG_CAPABILITY_OFFSET);
@@ -447,10 +405,10 @@ impl VfioPciDevice {
 
             match PciCapabilityID::from(cap_id) {
                 PciCapabilityID::MessageSignalledInterrupts => {
-                    self.parse_msi_capabilities(cap_next);
+                    self.parse_msi_capabilities(cap_next, interrupt_manager);
                 }
                 PciCapabilityID::MSIX => {
-                    self.parse_msix_capabilities(cap_next);
+                    self.parse_msix_capabilities(cap_next, interrupt_manager);
                 }
                 _ => {}
             };
@@ -461,158 +419,66 @@ impl VfioPciDevice {
         }
     }
 
-    fn update_msi_interrupt_routes(&self, msi: &VfioMsi) -> Result<()> {
-        if msi.cap.enabled() {
-            let mut gsi_msi_routes = self.gsi_msi_routes.lock().unwrap();
-
-            for (idx, route) in self.interrupt_routes.iter().enumerate() {
-                // Ignore MSI vector if the amount of vectors supported by the
-                // guest OS does not match the expected amount. This is related
-                // to "Multiple Message Capable" and "Multiple Message Enable"
-                // fields from the "Message Control" register.
-                if idx >= msi.cap.num_enabled_vectors() {
-                    continue;
-                }
-
-                // Ignore MSI vector if masked.
-                if msi.cap.vector_masked(idx) {
-                    continue;
-                }
-
-                let mut entry = kvm_irq_routing_entry {
-                    gsi: route.gsi,
-                    type_: KVM_IRQ_ROUTING_MSI,
-                    ..Default::default()
-                };
-
-                entry.u.msi.address_lo = msi.cap.msg_addr_lo;
-                entry.u.msi.address_hi = msi.cap.msg_addr_hi;
-                entry.u.msi.data = u32::from(msi.cap.msg_data) | (idx as u32);
-
-                gsi_msi_routes.insert(route.gsi, entry);
-            }
-        } else {
-            let mut gsi_msi_routes = self.gsi_msi_routes.lock().unwrap();
-
-            for route in self.interrupt_routes.iter() {
-                gsi_msi_routes.remove(&route.gsi);
-            }
-        }
-
-        self.set_kvm_routes()
-    }
-
-    fn update_msix_interrupt_routes(&self, msix: &VfioMsix) -> Result<()> {
-        if msix.cap.enabled() && !msix.cap.masked() {
-            let mut gsi_msi_routes = self.gsi_msi_routes.lock().unwrap();
-
-            for (idx, table_entry) in msix.bar.table_entries.iter().enumerate() {
-                // Ignore MSI-X vector if masked.
-                if table_entry.masked() {
-                    continue;
-                }
-
-                let gsi = self.interrupt_routes[idx].gsi;
-
-                let mut entry = kvm_irq_routing_entry {
-                    gsi,
-                    type_: KVM_IRQ_ROUTING_MSI,
-                    ..Default::default()
-                };
-
-                entry.u.msi.address_lo = table_entry.msg_addr_lo;
-                entry.u.msi.address_hi = table_entry.msg_addr_hi;
-                entry.u.msi.data = table_entry.msg_data;
-
-                gsi_msi_routes.insert(gsi, entry);
-            }
-        } else {
-            let mut gsi_msi_routes = self.gsi_msi_routes.lock().unwrap();
-
-            for route in self.interrupt_routes.iter() {
-                gsi_msi_routes.remove(&route.gsi);
-            }
-        }
-
-        self.set_kvm_routes()
-    }
-
-    fn read_msix_table(&mut self, offset: u64, data: &mut [u8]) {
-        self.interrupt.msix_read_table(offset, data);
-    }
-
-    fn write_msix_table(&mut self, offset: u64, data: &[u8]) {
-        self.interrupt.msix_write_table(offset, data);
-
-        if let Some(msix) = &self.interrupt.msix {
-            if let Err(e) = self.update_msix_interrupt_routes(&msix) {
-                error!("Could not update MSI-X interrupt routes: {}", e);
-            }
-        }
-    }
-
     fn update_msi_capabilities(&mut self, offset: u64, data: &[u8]) -> Result<()> {
         match self.interrupt.update_msi(offset, data) {
-            Some(InterruptUpdateAction::EnableMsi) => match self.enable_irq_fds() {
+            Some(InterruptUpdateAction::EnableMsi) => {
-                Ok(fds) => {
+                if let Some(msi) = &self.interrupt.msi {
-                    if let Err(e) = self.device.enable_msi(fds) {
+                    let mut irq_fds: Vec<&EventFd> = Vec::new();
+                    for i in 0..msi.cfg.num_enabled_vectors() {
+                        if let Some(eventfd) =
+                            msi.interrupt_source_group.notifier(i as InterruptIndex)
+                        {
+                            irq_fds.push(eventfd);
+                        } else {
+                            return Err(VfioPciError::UpdateMsiEventFd);
+                        }
+                    }
+
+                    if let Err(e) = self.device.enable_msi(irq_fds) {
                         warn!("Could not enable MSI: {}", e);
                     }
                 }
-                Err(e) => warn!("Could not get IRQ fds: {}", e),
+            }
-            },
             Some(InterruptUpdateAction::DisableMsi) => {
                 if let Err(e) = self.device.disable_msi() {
                     warn!("Could not disable MSI: {}", e);
                 }
-                if let Err(e) = self.disable_irq_fds() {
-                    warn!("Could not disable MSI: {}", e);
-                }
             }
             _ => {}
         }
 
-        // Update the gsi_msi_routes table now that the MSI cache has been
+        Ok(())
-        // updated. The point is to always update the table based on latest
-        // changes to the cache, and based on the state of masking flags, the
-        // KVM GSI routes should be configured.
-        if let Some(msi) = &self.interrupt.msi {
-            return self.update_msi_interrupt_routes(&msi);
-        }
-
-        // If the code reach this point, something went wrong.
-        Err(VfioPciError::MsiNotConfigured)
     }
 
     fn update_msix_capabilities(&mut self, offset: u64, data: &[u8]) -> Result<()> {
         match self.interrupt.update_msix(offset, data) {
-            Some(InterruptUpdateAction::EnableMsix) => match self.enable_irq_fds() {
+            Some(InterruptUpdateAction::EnableMsix) => {
-                Ok(fds) => {
+                if let Some(msix) = &self.interrupt.msix {
-                    if let Err(e) = self.device.enable_msix(fds) {
+                    let mut irq_fds: Vec<&EventFd> = Vec::new();
+                    for i in 0..msix.bar.table_entries.len() {
+                        if let Some(eventfd) =
+                            msix.interrupt_source_group.notifier(i as InterruptIndex)
+                        {
+                            irq_fds.push(eventfd);
+                        } else {
+                            return Err(VfioPciError::UpdateMsiEventFd);
+                        }
+                    }
+
+                    if let Err(e) = self.device.enable_msix(irq_fds) {
                         warn!("Could not enable MSI-X: {}", e);
                     }
                 }
-                Err(e) => warn!("Could not get IRQ fds: {}", e),
+            }
-            },
             Some(InterruptUpdateAction::DisableMsix) => {
                 if let Err(e) = self.device.disable_msix() {
                     warn!("Could not disable MSI-X: {}", e);
                 }
-                if let Err(e) = self.disable_irq_fds() {
-                    warn!("Could not disable MSI: {}", e);
-                }
             }
             _ => {}
         }
 
-        // Update the gsi_msi_routes table because the state of the enable bit
+        Ok(())
-        // changed.
-        if let Some(msix) = &self.interrupt.msix {
-            return self.update_msix_interrupt_routes(&msix);
-        }
-
-        // If the code reach this point, something went wrong.
-        Err(VfioPciError::MsixNotConfigured)
     }
 
     fn find_region(&self, addr: u64) -> Option<MmioRegion> {
@@ -637,9 +503,11 @@ impl VfioPciDevice {
     /// # Return value
     ///
     /// This function returns the updated KVM memory slot id.
-    pub fn map_mmio_regions(&mut self, vm: &Arc<VmFd>, mem_slot: u32) -> Result<u32> {
+    pub fn map_mmio_regions<F>(&mut self, vm: &Arc<VmFd>, mem_slot: F) -> Result<()>
+    where
+        F: Fn() -> u32,
+    {
         let fd = self.device.as_raw_fd();
-        let mut new_mem_slot = mem_slot;
 
         for region in self.mmio_regions.iter_mut() {
             // We want to skip the mapping of the BAR containing the MSI-X
@@ -683,8 +551,9 @@ impl VfioPciDevice {
                     continue;
                 }
 
+                let slot = mem_slot();
                 let mem_region = kvm_userspace_memory_region {
-                    slot: new_mem_slot as u32,
+                    slot,
                     guest_phys_addr: region.start.raw_value() + mmap_offset,
                     memory_size: mmap_size as u64,
                     userspace_addr: host_addr as u64,
@@ -698,24 +567,43 @@ impl VfioPciDevice {
                 }
 
                 // Update the region with memory mapped info.
-                region.mem_slot = Some(new_mem_slot);
+                region.mem_slot = Some(slot);
                 region.host_addr = Some(host_addr as u64);
                 region.mmap_size = Some(mmap_size as usize);
-
-                new_mem_slot += 1;
             }
         }
 
-        Ok(new_mem_slot)
+        Ok(())
     }
 
     pub fn unmap_mmio_regions(&mut self) {
         for region in self.mmio_regions.iter() {
-            if let (Some(addr), Some(size)) = (region.host_addr, region.mmap_size) {
+            if let (Some(host_addr), Some(mmap_size), Some(mem_slot)) =
-                let ret = unsafe { libc::munmap(addr as *mut libc::c_void, size) };
+                (region.host_addr, region.mmap_size, region.mem_slot)
+            {
+                let (mmap_offset, _) = self.device.get_region_mmap(region.index);
+
+                // Remove region from KVM
+                let kvm_region = kvm_userspace_memory_region {
+                    slot: mem_slot,
+                    guest_phys_addr: region.start.raw_value() + mmap_offset,
+                    memory_size: 0,
+                    userspace_addr: host_addr,
+                    flags: 0,
+                };
+                // Safe because the guest regions are guaranteed not to overlap.
+                if let Err(e) = unsafe { self.vm_fd.set_user_memory_region(kvm_region) } {
+                    error!(
+                        "Could not remove the userspace memory region from KVM: {}",
+                        e
+                    );
+                }
+
+                let ret = unsafe { libc::munmap(host_addr as *mut libc::c_void, mmap_size) };
                 if ret != 0 {
                     error!(
-                        "Could not unmap regions, error:{}",
+                        "Could not unmap region {}, error:{}",
+                        region.index,
                         io::Error::last_os_error()
                     );
                 }
@@ -729,13 +617,13 @@ impl Drop for VfioPciDevice {
         self.unmap_mmio_regions();
 
         if let Some(msix) = &self.interrupt.msix {
-            if msix.cap.enabled() && self.device.disable_msix().is_err() {
+            if msix.bar.enabled() && self.device.disable_msix().is_err() {
                 error!("Could not disable MSI-X");
             }
         }
 
         if let Some(msi) = &self.interrupt.msi {
-            if msi.cap.enabled() && self.device.disable_msi().is_err() {
+            if msi.cfg.enabled() && self.device.disable_msi().is_err() {
                 error!("Could not disable MSI");
             }
         }
@@ -864,7 +752,7 @@ impl PciDevice for VfioPciDevice {
                     let msb_bar_offset: u32 = PCI_CONFIG_BAR_OFFSET + (bar_id + 1) * 4;
 
                     self.vfio_pci_configuration
-                        .write_config_dword(msb_bar_offset, msb_size);
+                        .write_config_dword(msb_size, msb_bar_offset);
 
                     msb_size = self
                         .vfio_pci_configuration
@@ -933,6 +821,7 @@ impl PciDevice for VfioPciDevice {
             self.mmio_regions.push(MmioRegion {
                 start: bar_addr,
                 length: region_size,
+                type_: region_type,
                 index: bar_id as u32,
                 mem_slot: None,
                 host_addr: None,
@@ -952,6 +841,26 @@ impl PciDevice for VfioPciDevice {
         Ok(ranges)
     }
 
+    fn free_bars(
+        &mut self,
+        allocator: &mut SystemAllocator,
+    ) -> std::result::Result<(), PciDeviceError> {
+        for region in self.mmio_regions.iter() {
+            match region.type_ {
+                PciBarRegionType::IORegion => {
+                    allocator.free_io_addresses(region.start, region.length);
+                }
+                PciBarRegionType::Memory32BitRegion => {
+                    allocator.free_mmio_hole_addresses(region.start, region.length);
+                }
+                PciBarRegionType::Memory64BitRegion => {
+                    allocator.free_mmio_addresses(region.start, region.length);
+                }
+            }
+        }
+        Ok(())
+    }
+
     fn write_config_register(&mut self, reg_idx: usize, offset: u64, data: &[u8]) {
         // When the guest wants to write to a BAR, we trap it into
         // our local configuration space. We're not reprogramming
@@ -1002,7 +911,7 @@ impl PciDevice for VfioPciDevice {
             .region_write(VFIO_PCI_CONFIG_REGION_INDEX, data, reg + offset);
     }
 
-    fn read_config_register(&self, reg_idx: usize) -> u32 {
+    fn read_config_register(&mut self, reg_idx: usize) -> u32 {
         // When reading the BARs, we trap it and return what comes
         // from our local configuration space. We want the guest to
         // use that and not the VFIO device BARs as it does not map
@@ -1050,7 +959,7 @@ impl PciDevice for VfioPciDevice {
             let offset = addr - region.start.raw_value();
 
             if self.interrupt.msix_table_accessed(region.index, offset) {
-                self.read_msix_table(offset, data);
+                self.interrupt.msix_read_table(offset, data);
             } else {
                 self.device.region_read(region.index, data, offset);
             }
@@ -1064,7 +973,7 @@ impl PciDevice for VfioPciDevice {
 
             // If the MSI-X table is written to, we need to update our cache.
             if self.interrupt.msix_table_accessed(region.index, offset) {
-                self.write_msix_table(offset, data);
+                self.interrupt.msix_write_table(offset, data);
             } else {
                 self.device.region_write(region.index, data, offset);
             }

vhost_rs/Cargo.toml

@@ -1,25 +0,0 @@
-[package]
-name = "vhost_rs"
-version = "0.1.0"
-authors = ["Liu Jiang <gerry@linux.alibaba.com>"]
-repository = "https://github.com/rust-vmm/vhost"
-license = "Apache-2.0 or BSD-3-Clause"
-
-[features]
-default = []
-vhost-vsock = []
-vhost-kern = ["vm-memory"]
-vhost-user-master = []
-vhost-user-slave = []
-
-[dependencies]
-bitflags = "1.1.0"
-libc = "0.2.60"
-vmm-sys-util = ">=0.3.1"
-
-[dependencies.vm-memory]
-git = "https://github.com/rust-vmm/vm-memory"
-optional = true
-
-[dev-dependencies]
-tempfile = "3.1.0"

vhost_rs/LICENSE

@@ -1,202 +0,0 @@
-
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-
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vhost_rs/LICENSE-BSD

@@ -1,27 +0,0 @@
-// Copyright 2017 The Chromium OS Authors. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//    * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//    * Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following disclaimer
-// in the documentation and/or other materials provided with the
-// distribution.
-//    * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vhost_rs/LICENSE-MIT

@@ -1,24 +0,0 @@
-Permission is hereby granted, free of charge, to any
-person obtaining a copy of this software and associated
-documentation files (the "Software"), to deal in the
-Software without restriction, including without
-limitation the rights to use, copy, modify, merge,
-publish, distribute, sublicense, and/or sell copies of
-the Software, and to permit persons to whom the Software
-is furnished to do so, subject to the following
-conditions:
-
-The above copyright notice and this permission notice
-shall be included in all copies or substantial portions
-of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
-ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
-TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
-PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
-SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
-IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-DEALINGS IN THE SOFTWARE.
-

vhost_rs/README.md

@@ -1,10 +0,0 @@
-# vHost
-A crate to support vhost backend drivers for virtio devices.
-
-## Kernel-based vHost Backend Drivers
-The vhost drivers in Linux provide in-kernel virtio device emulation. Normally the hypervisor userspace process emulates I/O accesses from the guest. Vhost puts virtio emulation code into the kernel, taking hypervisor userspace out of the picture. This allows device emulation code to directly call into kernel subsystems instead of performing system calls from userspace. The hypervisor relies on ioctl based interfaces to control those in-kernel vhost drivers, such as vhost-net, vhost-scsi and vhost-vsock etc.
-
-## vHost-user Backend Drivers
-The vhost-user protocol is aiming to implement vhost backend drivers in userspace, which complements the ioctl interface used to control the vhost implementation in the Linux kernel. It implements the control plane needed to establish virtqueue sharing with a user space process on the same host. It uses communication over a Unix domain socket to share file descriptors in the ancillary data of the message.
-
-The protocol defines two sides of the communication, master and slave. Master is the application that shares its virtqueues, slave is the consumer of the virtqueues. Master and slave can be either a client (i.e. connecting) or server (listening) in the socket communication.

vhost_rs/src/backend.rs

@@ -1,130 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
-//
-// Portions Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
-//
-// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE-BSD file.
-
-//! Common traits and structs for vhost-kern and vhost-user backend drivers.
-
-use super::Result;
-use std::os::unix::io::RawFd;
-use vmm_sys_util::eventfd::EventFd;
-
-/// Maximum number of memory regions supported.
-pub const VHOST_MAX_MEMORY_REGIONS: usize = 255;
-
-/// Vring/virtque configuration data.
-pub struct VringConfigData {
-    /// Maximum queue size supported by the driver.
-    pub queue_max_size: u16,
-    /// Actual queue size negotiated by the driver.
-    pub queue_size: u16,
-    /// Bitmask of vring flags.
-    pub flags: u32,
-    /// Descriptor table address.
-    pub desc_table_addr: u64,
-    /// Used ring buffer address.
-    pub used_ring_addr: u64,
-    /// Available ring buffer address.
-    pub avail_ring_addr: u64,
-    /// Optional address for logging.
-    pub log_addr: Option<u64>,
-}
-
-/// Memory region configuration data.
-#[derive(Default, Clone, Copy)]
-pub struct VhostUserMemoryRegionInfo {
-    /// Guest physical address of the memory region.
-    pub guest_phys_addr: u64,
-    /// Size of the memory region.
-    pub memory_size: u64,
-    /// Virtual address in the current process.
-    pub userspace_addr: u64,
-    /// Optional offset where region starts in the mapped memory.
-    pub mmap_offset: u64,
-    /// Optional file diescriptor for mmap
-    pub mmap_handle: RawFd,
-}
-
-/// An interface for setting up vhost-based backend drivers.
-///
-/// Vhost-based virtio devices are different from regular virtio devices because the the vhost
-/// backend takes care of handling all the data transfer. The device itself only needs to deal with
-/// setting up the the backend driver and managing the control channel.
-pub trait VhostBackend: std::marker::Sized {
-    /// Get a bitmask of supported virtio/vhost features.
-    fn get_features(&mut self) -> Result<u64>;
-
-    /// Inform the vhost subsystem which features to enable.
-    /// This should be a subset of supported features from get_features().
-    ///
-    /// # Arguments
-    /// * `features` - Bitmask of features to set.
-    fn set_features(&mut self, features: u64) -> Result<()>;
-
-    /// Set the current process as the owner of the vhost backend.
-    /// This must be run before any other vhost commands.
-    fn set_owner(&mut self) -> Result<()>;
-
-    /// Used to be sent to request disabling all rings
-    /// This is no longer used.
-    fn reset_owner(&mut self) -> Result<()>;
-
-    /// Set the guest memory mappings for vhost to use.
-    fn set_mem_table(&mut self, regions: &[VhostUserMemoryRegionInfo]) -> Result<()>;
-
-    /// Set base address for page modification logging.
-    fn set_log_base(&mut self, base: u64, fd: Option<RawFd>) -> Result<()>;
-
-    /// Specify an eventfd file descriptor to signal on log write.
-    fn set_log_fd(&mut self, fd: RawFd) -> Result<()>;
-
-    /// Set the number of descriptors in the vring.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to set descriptor count for.
-    /// * `num` - Number of descriptors in the queue.
-    fn set_vring_num(&mut self, queue_index: usize, num: u16) -> Result<()>;
-
-    /// Set the addresses for a given vring.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to set addresses for.
-    /// * `config_data` - Configuration data for a vring.
-    fn set_vring_addr(&mut self, queue_index: usize, config_data: &VringConfigData) -> Result<()>;
-
-    /// Set the first index to look for available descriptors.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to modify.
-    /// * `num` - Index where available descriptors start.
-    fn set_vring_base(&mut self, queue_index: usize, base: u16) -> Result<()>;
-
-    /// Get the available vring base offset.
-    fn get_vring_base(&mut self, queue_index: usize) -> Result<u32>;
-
-    /// Set the eventfd to trigger when buffers have been used by the host.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to modify.
-    /// * `fd` - EventFd to trigger.
-    fn set_vring_call(&mut self, queue_index: usize, fd: &EventFd) -> Result<()>;
-
-    /// Set the eventfd that will be signaled by the guest when buffers are
-    /// available for the host to process.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to modify.
-    /// * `fd` - EventFd that will be signaled from guest.
-    fn set_vring_kick(&mut self, queue_index: usize, fd: &EventFd) -> Result<()>;
-
-    /// Set the eventfd that will be signaled by the guest when error happens.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to modify.
-    /// * `fd` - EventFd that will be signaled from guest.
-    fn set_vring_err(&mut self, queue_index: usize, fd: &EventFd) -> Result<()>;
-}

vhost_rs/src/lib.rs

@@ -1,120 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
-//
-// Portions Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
-//
-// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE-BSD file.
-
-//! Virtio Vhost Backend Drivers
-//!
-//! Virtio devices use virtqueues to transport data efficiently. Virtqueue is a set of three
-//! different single-producer, single-consumer ring structures designed to store generic
-//! scatter-gather I/O.
-//!
-//! Vhost is a mechanism to improve performance of Virtio devices by delegate data plane operations
-//! to dedicated IO service processes. Only the configuration, I/O submission notification, and I/O
-//! completion interruption are piped through the hypervisor.
-//! It uses the same virtqueue layout as Virtio to allow Vhost devices to be mapped directly to
-//! Virtio devices. This allows a Vhost device to be accessed directly by a guest OS inside a
-//! hypervisor process with an existing Virtio (PCI) driver.
-//!
-//! The initial vhost implementation is a part of the Linux kernel and uses ioctl interface to
-//! communicate with userspace applications. Dedicated kernel worker threads are created to handle
-//! IO requests from the guest.
-//!
-//! Later Vhost-user protocol is introduced to complement the ioctl interface used to control the
-//! vhost implementation in the Linux kernel. It implements the control plane needed to establish
-//! virtqueues sharing with a user space process on the same host. It uses communication over a
-//! Unix domain socket to share file descriptors in the ancillary data of the message.
-//! The protocol defines 2 sides of the communication, master and slave. Master is the application
-//! that shares its virtqueues. Slave is the consumer of the virtqueues. Master and slave can be
-//! either a client (i.e. connecting) or server (listening) in the socket communication.
-
-#![deny(missing_docs)]
-
-#[cfg_attr(
-    any(feature = "vhost-user-master", feature = "vhost-user-slave"),
-    macro_use
-)]
-extern crate bitflags;
-extern crate libc;
-#[cfg(feature = "vhost-kern")]
-extern crate vm_memory;
-#[cfg_attr(feature = "vhost-kern", macro_use)]
-extern crate vmm_sys_util;
-
-mod backend;
-pub use backend::*;
-
-#[cfg(feature = "vhost-kern")]
-pub mod vhost_kern;
-#[cfg(any(feature = "vhost-user-master", feature = "vhost-user-slave"))]
-pub mod vhost_user;
-#[cfg(feature = "vhost-vsock")]
-pub mod vsock;
-
-/// Error codes for vhost operations
-#[derive(Debug)]
-pub enum Error {
-    /// Invalid operations.
-    InvalidOperation,
-    /// Invalid guest memory.
-    InvalidGuestMemory,
-    /// Invalid guest memory region.
-    InvalidGuestMemoryRegion,
-    /// Invalid queue.
-    InvalidQueue,
-    /// Invalid descriptor table address.
-    DescriptorTableAddress,
-    /// Invalid used address.
-    UsedAddress,
-    /// Invalid available address.
-    AvailAddress,
-    /// Invalid log address.
-    LogAddress,
-    #[cfg(feature = "vhost-kern")]
-    /// Error opening the vhost backend driver.
-    VhostOpen(std::io::Error),
-    #[cfg(feature = "vhost-kern")]
-    /// Error while running ioctl.
-    IoctlError(std::io::Error),
-    /// Error from IO subsystem.
-    IOError(std::io::Error),
-    #[cfg(any(feature = "vhost-user-master", feature = "vhost-user-slave"))]
-    /// Error from the vhost-user subsystem.
-    VhostUserProtocol(vhost_user::Error),
-}
-
-impl std::fmt::Display for Error {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        match self {
-            Error::InvalidOperation => write!(f, "invalid vhost operations"),
-            Error::InvalidGuestMemory => write!(f, "invalid guest memory object"),
-            Error::InvalidGuestMemoryRegion => write!(f, "invalid guest memory region"),
-            Error::InvalidQueue => write!(f, "invalid virtque"),
-            Error::DescriptorTableAddress => write!(f, "invalid virtque descriptor talbe address"),
-            Error::UsedAddress => write!(f, "invalid virtque used talbe address"),
-            Error::AvailAddress => write!(f, "invalid virtque available talbe address"),
-            Error::LogAddress => write!(f, "invalid virtque log address"),
-            Error::IOError(e) => write!(f, "IO error: {}", e),
-            #[cfg(feature = "vhost-kern")]
-            Error::VhostOpen(e) => write!(f, "failure in opening vhost file: {}", e),
-            #[cfg(feature = "vhost-kern")]
-            Error::IoctlError(e) => write!(f, "failure in vhost ioctl: {}", e),
-            #[cfg(any(feature = "vhost-user-master", feature = "vhost-user-slave"))]
-            Error::VhostUserProtocol(e) => write!(f, "vhost-user: {}", e),
-        }
-    }
-}
-
-#[cfg(any(feature = "vhost-user-master", feature = "vhost-user-slave"))]
-impl std::convert::From<vhost_user::Error> for Error {
-    fn from(err: vhost_user::Error) -> Self {
-        Error::VhostUserProtocol(err)
-    }
-}
-
-/// Result of vhost operations
-pub type Result<T> = std::result::Result<T, Error>;

vhost_rs/src/vhost_kern/mod.rs

@@ -1,320 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
-//
-// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE-BSD file.
-
-//! Traits and structs to control Linux in-kernel vhost drivers.
-//!
-//! The initial vhost implementation is a part of the Linux kernel and uses ioctl interface to
-//! communicate with userspace applications. This sub module provides ioctl based interfaces to
-//! control the in-kernel net, scsi, vsock vhost drivers.
-
-use std::os::unix::io::{AsRawFd, RawFd};
-use std::ptr::null;
-
-use vm_memory::{Address, GuestAddress, GuestMemory, GuestUsize};
-use vmm_sys_util::eventfd::EventFd;
-use vmm_sys_util::ioctl::{ioctl, ioctl_with_mut_ref, ioctl_with_ptr, ioctl_with_ref};
-
-use super::{
-    Error, Result, VhostBackend, VhostUserMemoryRegionInfo, VringConfigData,
-    VHOST_MAX_MEMORY_REGIONS,
-};
-
-pub mod vhost_binding;
-use self::vhost_binding::*;
-
-#[cfg(feature = "vhost-vsock")]
-pub mod vsock;
-
-#[inline]
-fn ioctl_result<T>(rc: i32, res: T) -> Result<T> {
-    if rc < 0 {
-        Err(Error::IoctlError(std::io::Error::last_os_error()))
-    } else {
-        Ok(res)
-    }
-}
-
-fn guest_addr(addr: u64) -> GuestAddress {
-    GuestAddress::new(addr)
-}
-
-/// Represent an in-kernel vhost device backend.
-pub trait VhostKernBackend<'a>: AsRawFd {
-    /// Associated type to access the guest's memory.
-    type M: GuestMemory<'a>;
-
-    /// Get the object to access the guest's memory.
-    fn mem(&self) -> &Self::M;
-
-    /// Check whether the ring configuration is valid.
-    #[allow(clippy::if_same_then_else)]
-    #[allow(clippy::needless_bool)]
-    fn is_valid(
-        &self,
-        queue_max_size: u16,
-        queue_size: u16,
-        desc_addr: GuestAddress,
-        avail_addr: GuestAddress,
-        used_addr: GuestAddress,
-    ) -> bool {
-        let desc_table_size = 16 * u64::from(queue_size) as GuestUsize;
-        let avail_ring_size = 6 + 2 * u64::from(queue_size) as GuestUsize;
-        let used_ring_size = 6 + 8 * u64::from(queue_size) as GuestUsize;
-        if queue_size > queue_max_size || queue_size == 0 || (queue_size & (queue_size - 1)) != 0 {
-            false
-        } else if desc_addr
-            .checked_add(desc_table_size)
-            .map_or(true, |v| !self.mem().address_in_range(v))
-        {
-            false
-        } else if avail_addr
-            .checked_add(avail_ring_size)
-            .map_or(true, |v| !self.mem().address_in_range(v))
-        {
-            false
-        } else if used_addr
-            .checked_add(used_ring_size)
-            .map_or(true, |v| !self.mem().address_in_range(v))
-        {
-            false
-        } else {
-            true
-        }
-    }
-}
-
-impl<'a, T: VhostKernBackend<'a>> VhostBackend for T {
-    /// Set the current process as the owner of this file descriptor.
-    /// This must be run before any other vhost ioctls.
-    fn set_owner(&mut self) -> Result<()> {
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl(self, VHOST_SET_OWNER()) };
-        ioctl_result(ret, ())
-    }
-
-    fn reset_owner(&mut self) -> Result<()> {
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl(self, VHOST_RESET_OWNER()) };
-        ioctl_result(ret, ())
-    }
-
-    /// Get a bitmask of supported virtio/vhost features.
-    fn get_features(&mut self) -> Result<u64> {
-        let mut avail_features: u64 = 0;
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl_with_mut_ref(self, VHOST_GET_FEATURES(), &mut avail_features) };
-        ioctl_result(ret, avail_features)
-    }
-
-    /// Inform the vhost subsystem which features to enable. This should be a subset of
-    /// supported features from VHOST_GET_FEATURES.
-    ///
-    /// # Arguments
-    /// * `features` - Bitmask of features to set.
-    fn set_features(&mut self, features: u64) -> Result<()> {
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl_with_ref(self, VHOST_SET_FEATURES(), &features) };
-        ioctl_result(ret, ())
-    }
-
-    /// Set the guest memory mappings for vhost to use.
-    fn set_mem_table(&mut self, regions: &[VhostUserMemoryRegionInfo]) -> Result<()> {
-        if regions.is_empty() || regions.len() > VHOST_MAX_MEMORY_REGIONS {
-            return Err(Error::InvalidGuestMemory);
-        }
-
-        let mut vhost_memory = VhostMemory::new(regions.len() as u16);
-        for (index, region) in regions.iter().enumerate() {
-            vhost_memory.set_region(
-                index as u32,
-                &vhost_memory_region {
-                    guest_phys_addr: region.guest_phys_addr,
-                    memory_size: region.memory_size,
-                    userspace_addr: region.userspace_addr,
-                    flags_padding: 0u64,
-                },
-            )?;
-        }
-
-        // This ioctl is called with a pointer that is valid for the lifetime
-        // of this function. The kernel will make its own copy of the memory
-        // tables. As always, check the return value.
-        let ret = unsafe { ioctl_with_ptr(self, VHOST_SET_MEM_TABLE(), vhost_memory.as_ptr()) };
-        ioctl_result(ret, ())
-    }
-
-    /// Set base address for page modification logging.
-    ///
-    /// # Arguments
-    /// * `base` - Base address for page modification logging.
-    fn set_log_base(&mut self, base: u64, fd: Option<RawFd>) -> Result<()> {
-        if fd.is_some() {
-            return Err(Error::LogAddress);
-        }
-
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl_with_ref(self, VHOST_SET_LOG_BASE(), &base) };
-        ioctl_result(ret, ())
-    }
-
-    /// Specify an eventfd file descriptor to signal on log write.
-    fn set_log_fd(&mut self, fd: RawFd) -> Result<()> {
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let val: i32 = fd;
-        let ret = unsafe { ioctl_with_ref(self, VHOST_SET_LOG_FD(), &val) };
-        ioctl_result(ret, ())
-    }
-
-    /// Set the number of descriptors in the vring.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to set descriptor count for.
-    /// * `num` - Number of descriptors in the queue.
-    fn set_vring_num(&mut self, queue_index: usize, num: u16) -> Result<()> {
-        let vring_state = vhost_vring_state {
-            index: queue_index as u32,
-            num: u32::from(num),
-        };
-
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl_with_ref(self, VHOST_SET_VRING_NUM(), &vring_state) };
-        ioctl_result(ret, ())
-    }
-
-    /// Set the addresses for a given vring.
-    ///
-    /// # Arguments
-    /// * `queue_max_size` - Maximum queue size supported by the device.
-    /// * `queue_size` - Actual queue size negotiated by the driver.
-    /// * `queue_index` - Index of the queue to set addresses for.
-    /// * `flags` - Bitmask of vring flags.
-    /// * `desc_table_addr` - Descriptor table address.
-    /// * `used_ring_addr` - Used ring buffer address.
-    /// * `avail_ring_addr` - Available ring buffer address.
-    /// * `log_addr` - Optional address for logging.
-    fn set_vring_addr(&mut self, queue_index: usize, config_data: &VringConfigData) -> Result<()> {
-        if !self.is_valid(
-            config_data.queue_max_size,
-            config_data.queue_size,
-            guest_addr(config_data.desc_table_addr),
-            guest_addr(config_data.used_ring_addr),
-            guest_addr(config_data.avail_ring_addr),
-        ) {
-            return Err(Error::InvalidQueue);
-        }
-
-        let desc_addr = self
-            .mem()
-            .get_host_address(guest_addr(config_data.desc_table_addr))
-            .ok_or(Error::DescriptorTableAddress)?;
-        let used_addr = self
-            .mem()
-            .get_host_address(guest_addr(config_data.used_ring_addr))
-            .ok_or(Error::UsedAddress)?;
-        let avail_addr = self
-            .mem()
-            .get_host_address(guest_addr(config_data.avail_ring_addr))
-            .ok_or(Error::AvailAddress)?;
-        let log_addr = match config_data.log_addr {
-            None => null(),
-            Some(a) => self
-                .mem()
-                .get_host_address(guest_addr(a))
-                .ok_or(Error::LogAddress)?,
-        };
-
-        let vring_addr = vhost_vring_addr {
-            index: queue_index as u32,
-            flags: config_data.flags,
-            desc_user_addr: desc_addr as u64,
-            used_user_addr: used_addr as u64,
-            avail_user_addr: avail_addr as u64,
-            log_guest_addr: log_addr as u64,
-        };
-
-        // This ioctl is called on a valid vhost fd and has its
-        // return value checked.
-        let ret = unsafe { ioctl_with_ref(self, VHOST_SET_VRING_ADDR(), &vring_addr) };
-        ioctl_result(ret, ())
-    }
-
-    /// Set the first index to look for available descriptors.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to modify.
-    /// * `num` - Index where available descriptors start.
-    fn set_vring_base(&mut self, queue_index: usize, base: u16) -> Result<()> {
-        let vring_state = vhost_vring_state {
-            index: queue_index as u32,
-            num: u32::from(base),
-        };
-
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl_with_ref(self, VHOST_SET_VRING_BASE(), &vring_state) };
-        ioctl_result(ret, ())
-    }
-
-    /// Get a bitmask of supported virtio/vhost features.
-    fn get_vring_base(&mut self, queue_index: usize) -> Result<u32> {
-        let vring_state = vhost_vring_state {
-            index: queue_index as u32,
-            num: 0,
-        };
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl_with_ref(self, VHOST_GET_VRING_BASE(), &vring_state) };
-        ioctl_result(ret, vring_state.num)
-    }
-
-    /// Set the eventfd to trigger when buffers have been used by the host.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to modify.
-    /// * `fd` - EventFd to trigger.
-    fn set_vring_call(&mut self, queue_index: usize, fd: &EventFd) -> Result<()> {
-        let vring_file = vhost_vring_file {
-            index: queue_index as u32,
-            fd: fd.as_raw_fd(),
-        };
-
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl_with_ref(self, VHOST_SET_VRING_CALL(), &vring_file) };
-        ioctl_result(ret, ())
-    }
-
-    /// Set the eventfd that will be signaled by the guest when buffers are
-    /// available for the host to process.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to modify.
-    /// * `fd` - EventFd that will be signaled from guest.
-    fn set_vring_kick(&mut self, queue_index: usize, fd: &EventFd) -> Result<()> {
-        let vring_file = vhost_vring_file {
-            index: queue_index as u32,
-            fd: fd.as_raw_fd(),
-        };
-
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl_with_ref(self, VHOST_SET_VRING_KICK(), &vring_file) };
-        ioctl_result(ret, ())
-    }
-
-    /// Set the eventfd to signal an error from the vhost backend.
-    ///
-    /// # Arguments
-    /// * `queue_index` - Index of the queue to modify.
-    /// * `fd` - EventFd that will be signaled from the backend.
-    fn set_vring_err(&mut self, queue_index: usize, fd: &EventFd) -> Result<()> {
-        let vring_file = vhost_vring_file {
-            index: queue_index as u32,
-            fd: fd.as_raw_fd(),
-        };
-
-        // This ioctl is called on a valid vhost fd and has its return value checked.
-        let ret = unsafe { ioctl_with_ref(self, VHOST_SET_VRING_ERR(), &vring_file) };
-        ioctl_result(ret, ())
-    }
-}

vhost_rs/src/vhost_kern/vhost_binding.rs

@@ -1,405 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
-//
-// Portions Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
-//
-// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE-BSD file.
-
-/* Auto-generated by bindgen then manually edited for simplicity */
-
-#![allow(non_upper_case_globals)]
-#![allow(non_camel_case_types)]
-#![allow(non_snake_case)]
-#![allow(missing_docs)]
-
-use std::os::raw;
-use {Error, Result};
-
-pub const VHOST: raw::c_uint = 0xaf;
-pub const VHOST_VRING_F_LOG: raw::c_uint = 0;
-pub const VHOST_ACCESS_RO: raw::c_uint = 1;
-pub const VHOST_ACCESS_WO: raw::c_uint = 2;
-pub const VHOST_ACCESS_RW: raw::c_uint = 3;
-pub const VHOST_IOTLB_MISS: raw::c_uint = 1;
-pub const VHOST_IOTLB_UPDATE: raw::c_uint = 2;
-pub const VHOST_IOTLB_INVALIDATE: raw::c_uint = 3;
-pub const VHOST_IOTLB_ACCESS_FAIL: raw::c_uint = 4;
-pub const VHOST_IOTLB_MSG: raw::c_uint = 1;
-pub const VHOST_PAGE_SIZE: raw::c_uint = 4096;
-pub const VHOST_VIRTIO: raw::c_uint = 175;
-pub const VHOST_VRING_LITTLE_ENDIAN: raw::c_uint = 0;
-pub const VHOST_VRING_BIG_ENDIAN: raw::c_uint = 1;
-pub const VHOST_F_LOG_ALL: raw::c_uint = 26;
-pub const VHOST_NET_F_VIRTIO_NET_HDR: raw::c_uint = 27;
-pub const VHOST_SCSI_ABI_VERSION: raw::c_uint = 1;
-
-ioctl_ior_nr!(VHOST_GET_FEATURES, VHOST, 0x00, raw::c_ulonglong);
-ioctl_iow_nr!(VHOST_SET_FEATURES, VHOST, 0x00, raw::c_ulonglong);
-ioctl_io_nr!(VHOST_SET_OWNER, VHOST, 0x01);
-ioctl_io_nr!(VHOST_RESET_OWNER, VHOST, 0x02);
-ioctl_iow_nr!(VHOST_SET_MEM_TABLE, VHOST, 0x03, vhost_memory);
-ioctl_iow_nr!(VHOST_SET_LOG_BASE, VHOST, 0x04, raw::c_ulonglong);
-ioctl_iow_nr!(VHOST_SET_LOG_FD, VHOST, 0x07, raw::c_int);
-ioctl_iow_nr!(VHOST_SET_VRING_NUM, VHOST, 0x10, vhost_vring_state);
-ioctl_iow_nr!(VHOST_SET_VRING_ADDR, VHOST, 0x11, vhost_vring_addr);
-ioctl_iow_nr!(VHOST_SET_VRING_BASE, VHOST, 0x12, vhost_vring_state);
-ioctl_iowr_nr!(VHOST_GET_VRING_BASE, VHOST, 0x12, vhost_vring_state);
-ioctl_iow_nr!(VHOST_SET_VRING_KICK, VHOST, 0x20, vhost_vring_file);
-ioctl_iow_nr!(VHOST_SET_VRING_CALL, VHOST, 0x21, vhost_vring_file);
-ioctl_iow_nr!(VHOST_SET_VRING_ERR, VHOST, 0x22, vhost_vring_file);
-ioctl_iow_nr!(vhost_SET_BACKEND, VHOST, 0x30, vhost_vring_file);
-ioctl_iow_nr!(VHOST_SCSI_SET_ENDPOINT, VHOST, 0x40, vhost_scsi_target);
-ioctl_iow_nr!(VHOST_SCSI_CLEAR_ENDPOINT, VHOST, 0x41, vhost_scsi_target);
-ioctl_iow_nr!(VHOST_SCSI_GET_ABI_VERSION, VHOST, 0x42, raw::c_int);
-ioctl_iow_nr!(VHOST_SCSI_SET_EVENTS_MISSED, VHOST, 0x43, raw::c_uint);
-ioctl_iow_nr!(VHOST_SCSI_GET_EVENTS_MISSED, VHOST, 0x44, raw::c_uint);
-ioctl_iow_nr!(VHOST_VSOCK_SET_GUEST_CID, VHOST, 0x60, raw::c_ulonglong);
-ioctl_iow_nr!(VHOST_VSOCK_SET_RUNNING, VHOST, 0x61, raw::c_int);
-
-#[repr(C)]
-#[derive(Default)]
-pub struct __IncompleteArrayField<T>(::std::marker::PhantomData<T>);
-
-impl<T> __IncompleteArrayField<T> {
-    #[inline]
-    pub fn new() -> Self {
-        __IncompleteArrayField(::std::marker::PhantomData)
-    }
-
-    #[inline]
-    #[allow(clippy::trivially_copy_pass_by_ref)]
-    #[allow(clippy::useless_transmute)]
-    pub unsafe fn as_ptr(&self) -> *const T {
-        ::std::mem::transmute(self)
-    }
-
-    #[inline]
-    #[allow(clippy::useless_transmute)]
-    pub unsafe fn as_mut_ptr(&mut self) -> *mut T {
-        ::std::mem::transmute(self)
-    }
-
-    #[inline]
-    pub unsafe fn as_slice(&self, len: usize) -> &[T] {
-        ::std::slice::from_raw_parts(self.as_ptr(), len)
-    }
-
-    #[inline]
-    pub unsafe fn as_mut_slice(&mut self, len: usize) -> &mut [T] {
-        ::std::slice::from_raw_parts_mut(self.as_mut_ptr(), len)
-    }
-}
-
-impl<T> ::std::fmt::Debug for __IncompleteArrayField<T> {
-    fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
-        fmt.write_str("__IncompleteArrayField")
-    }
-}
-
-impl<T> ::std::clone::Clone for __IncompleteArrayField<T> {
-    #[inline]
-    fn clone(&self) -> Self {
-        Self::new()
-    }
-}
-
-impl<T> ::std::marker::Copy for __IncompleteArrayField<T> {}
-
-#[repr(C)]
-#[derive(Debug, Default, Copy, Clone)]
-pub struct vhost_vring_state {
-    pub index: raw::c_uint,
-    pub num: raw::c_uint,
-}
-
-#[repr(C)]
-#[derive(Debug, Default, Copy, Clone)]
-pub struct vhost_vring_file {
-    pub index: raw::c_uint,
-    pub fd: raw::c_int,
-}
-
-#[repr(C)]
-#[derive(Debug, Default, Copy, Clone)]
-pub struct vhost_vring_addr {
-    pub index: raw::c_uint,
-    pub flags: raw::c_uint,
-    pub desc_user_addr: raw::c_ulonglong,
-    pub used_user_addr: raw::c_ulonglong,
-    pub avail_user_addr: raw::c_ulonglong,
-    pub log_guest_addr: raw::c_ulonglong,
-}
-
-#[repr(C)]
-#[derive(Debug, Default, Copy, Clone)]
-pub struct vhost_iotlb_msg {
-    pub iova: raw::c_ulonglong,
-    pub size: raw::c_ulonglong,
-    pub uaddr: raw::c_ulonglong,
-    pub perm: raw::c_uchar,
-    pub type_: raw::c_uchar,
-}
-
-#[repr(C)]
-#[derive(Copy, Clone)]
-pub struct vhost_msg {
-    pub type_: raw::c_int,
-    pub __bindgen_anon_1: vhost_msg__bindgen_ty_1,
-}
-
-impl Default for vhost_msg {
-    fn default() -> Self {
-        unsafe { ::std::mem::zeroed() }
-    }
-}
-
-#[repr(C)]
-#[derive(Copy, Clone)]
-pub union vhost_msg__bindgen_ty_1 {
-    pub iotlb: vhost_iotlb_msg,
-    pub padding: [raw::c_uchar; 64usize],
-    _bindgen_union_align: [u64; 8usize],
-}
-
-impl Default for vhost_msg__bindgen_ty_1 {
-    fn default() -> Self {
-        unsafe { ::std::mem::zeroed() }
-    }
-}
-
-#[repr(C)]
-#[derive(Debug, Default, Copy, Clone)]
-pub struct vhost_memory_region {
-    pub guest_phys_addr: raw::c_ulonglong,
-    pub memory_size: raw::c_ulonglong,
-    pub userspace_addr: raw::c_ulonglong,
-    pub flags_padding: raw::c_ulonglong,
-}
-
-#[repr(C)]
-#[derive(Debug, Default, Clone)]
-pub struct vhost_memory {
-    pub nregions: raw::c_uint,
-    pub padding: raw::c_uint,
-    pub regions: __IncompleteArrayField<vhost_memory_region>,
-    __force_alignment: [u64; 0],
-}
-
-#[repr(C)]
-#[derive(Copy, Clone)]
-pub struct vhost_scsi_target {
-    pub abi_version: raw::c_int,
-    pub vhost_wwpn: [raw::c_char; 224usize],
-    pub vhost_tpgt: raw::c_ushort,
-    pub reserved: raw::c_ushort,
-}
-
-impl Default for vhost_scsi_target {
-    fn default() -> Self {
-        unsafe { ::std::mem::zeroed() }
-    }
-}
-
-/// Helper to support vhost::set_mem_table()
-pub struct VhostMemory {
-    buf: Vec<vhost_memory>,
-}
-
-impl VhostMemory {
-    // Limit number of regions to u16 to simplify error handling
-    pub fn new(entries: u16) -> Self {
-        let size = std::mem::size_of::<vhost_memory_region>() * entries as usize;
-        let count = (size + 2 * std::mem::size_of::<vhost_memory>() - 1)
-            / std::mem::size_of::<vhost_memory>();
-        let mut buf: Vec<vhost_memory> = vec![Default::default(); count];
-        buf[0].nregions = u32::from(entries);
-        VhostMemory { buf }
-    }
-
-    pub fn as_ptr(&self) -> *const char {
-        &self.buf[0] as *const vhost_memory as *const char
-    }
-
-    pub fn get_header(&self) -> &vhost_memory {
-        &self.buf[0]
-    }
-
-    pub fn get_region(&self, index: u32) -> Option<&vhost_memory_region> {
-        if index >= self.buf[0].nregions {
-            return None;
-        }
-        // Safe because we have allocated enough space nregions
-        let regions = unsafe { self.buf[0].regions.as_slice(self.buf[0].nregions as usize) };
-        Some(&regions[index as usize])
-    }
-
-    pub fn set_region(&mut self, index: u32, region: &vhost_memory_region) -> Result<()> {
-        if index >= self.buf[0].nregions {
-            return Err(Error::InvalidGuestMemory);
-        }
-        // Safe because we have allocated enough space nregions and checked the index.
-        let regions = unsafe { self.buf[0].regions.as_mut_slice(index as usize + 1) };
-        regions[index as usize] = *region;
-        Ok(())
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn bindgen_test_layout_vhost_vring_state() {
-        assert_eq!(
-            ::std::mem::size_of::<vhost_vring_state>(),
-            8usize,
-            concat!("Size of: ", stringify!(vhost_vring_state))
-        );
-        assert_eq!(
-            ::std::mem::align_of::<vhost_vring_state>(),
-            4usize,
-            concat!("Alignment of ", stringify!(vhost_vring_state))
-        );
-    }
-
-    #[test]
-    fn bindgen_test_layout_vhost_vring_file() {
-        assert_eq!(
-            ::std::mem::size_of::<vhost_vring_file>(),
-            8usize,
-            concat!("Size of: ", stringify!(vhost_vring_file))
-        );
-        assert_eq!(
-            ::std::mem::align_of::<vhost_vring_file>(),
-            4usize,
-            concat!("Alignment of ", stringify!(vhost_vring_file))
-        );
-    }
-
-    #[test]
-    fn bindgen_test_layout_vhost_vring_addr() {
-        assert_eq!(
-            ::std::mem::size_of::<vhost_vring_addr>(),
-            40usize,
-            concat!("Size of: ", stringify!(vhost_vring_addr))
-        );
-        assert_eq!(
-            ::std::mem::align_of::<vhost_vring_addr>(),
-            8usize,
-            concat!("Alignment of ", stringify!(vhost_vring_addr))
-        );
-    }
-
-    #[test]
-    fn bindgen_test_layout_vhost_msg__bindgen_ty_1() {
-        assert_eq!(
-            ::std::mem::size_of::<vhost_msg__bindgen_ty_1>(),
-            64usize,
-            concat!("Size of: ", stringify!(vhost_msg__bindgen_ty_1))
-        );
-        assert_eq!(
-            ::std::mem::align_of::<vhost_msg__bindgen_ty_1>(),
-            8usize,
-            concat!("Alignment of ", stringify!(vhost_msg__bindgen_ty_1))
-        );
-    }
-
-    #[test]
-    fn bindgen_test_layout_vhost_msg() {
-        assert_eq!(
-            ::std::mem::size_of::<vhost_msg>(),
-            72usize,
-            concat!("Size of: ", stringify!(vhost_msg))
-        );
-        assert_eq!(
-            ::std::mem::align_of::<vhost_msg>(),
-            8usize,
-            concat!("Alignment of ", stringify!(vhost_msg))
-        );
-    }
-
-    #[test]
-    fn bindgen_test_layout_vhost_memory_region() {
-        assert_eq!(
-            ::std::mem::size_of::<vhost_memory_region>(),
-            32usize,
-            concat!("Size of: ", stringify!(vhost_memory_region))
-        );
-        assert_eq!(
-            ::std::mem::align_of::<vhost_memory_region>(),
-            8usize,
-            concat!("Alignment of ", stringify!(vhost_memory_region))
-        );
-    }
-
-    #[test]
-    fn bindgen_test_layout_vhost_memory() {
-        assert_eq!(
-            ::std::mem::size_of::<vhost_memory>(),
-            8usize,
-            concat!("Size of: ", stringify!(vhost_memory))
-        );
-        assert_eq!(
-            ::std::mem::align_of::<vhost_memory>(),
-            8usize,
-            concat!("Alignment of ", stringify!(vhost_memory))
-        );
-    }
-
-    #[test]
-    fn bindgen_test_layout_vhost_iotlb_msg() {
-        assert_eq!(
-            ::std::mem::size_of::<vhost_iotlb_msg>(),
-            32usize,
-            concat!("Size of: ", stringify!(vhost_iotlb_msg))
-        );
-        assert_eq!(
-            ::std::mem::align_of::<vhost_iotlb_msg>(),
-            8usize,
-            concat!("Alignment of ", stringify!(vhost_iotlb_msg))
-        );
-    }
-
-    #[test]
-    fn bindgen_test_layout_vhost_scsi_target() {
-        assert_eq!(
-            ::std::mem::size_of::<vhost_scsi_target>(),
-            232usize,
-            concat!("Size of: ", stringify!(vhost_scsi_target))
-        );
-        assert_eq!(
-            ::std::mem::align_of::<vhost_scsi_target>(),
-            4usize,
-            concat!("Alignment of ", stringify!(vhost_scsi_target))
-        );
-    }
-
-    #[test]
-    fn test_vhostmemory() {
-        let mut obj = VhostMemory::new(2);
-        let region = vhost_memory_region {
-            guest_phys_addr: 0x1000u64,
-            memory_size: 0x2000u64,
-            userspace_addr: 0x300000u64,
-            flags_padding: 0u64,
-        };
-        assert!(obj.get_region(2).is_none());
-
-        {
-            let header = obj.get_header();
-            assert_eq!(header.nregions, 2u32);
-        }
-        {
-            assert!(obj.set_region(0, &region).is_ok());
-            assert!(obj.set_region(1, &region).is_ok());
-            assert!(obj.set_region(2, &region).is_err());
-        }
-
-        let region1 = obj.get_region(1).unwrap();
-        assert_eq!(region1.guest_phys_addr, 0x1000u64);
-        assert_eq!(region1.memory_size, 0x2000u64);
-        assert_eq!(region1.userspace_addr, 0x300000u64);
-    }
-}

vhost_rs/src/vhost_kern/vsock.rs

@@ -1,84 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0 or MIT
-//
-// Copyright 2017 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the THIRD-PARTY file.
-
-//! Kernel-based vsock vhost backend.
-
-use std::fs::{File, OpenOptions};
-use std::marker::PhantomData;
-use std::os::unix::fs::OpenOptionsExt;
-use std::os::unix::io::{AsRawFd, RawFd};
-
-use super::vhost_binding::{VHOST_VSOCK_SET_GUEST_CID, VHOST_VSOCK_SET_RUNNING};
-use super::{ioctl_result, Error, Result, VhostKernBackend};
-use libc;
-use vm_memory::GuestMemory;
-use vmm_sys_util::ioctl::ioctl_with_ref;
-
-const VHOST_PATH: &str = "/dev/vhost-vsock";
-
-/// Handle for running VHOST_VSOCK ioctls.
-pub struct Vsock<'a, M: GuestMemory<'a>> {
-    fd: File,
-    mem: M,
-    _phatomdata: PhantomData<&'a M>, // Get rid of unused type parameter `a
-}
-
-impl<'a, M: GuestMemory<'a>> Vsock<'a, M> {
-    /// Open a handle to a new VHOST-VSOCK instance.
-    pub fn new(mem: &M) -> Result<Self> {
-        Ok(Vsock {
-            fd: OpenOptions::new()
-                .read(true)
-                .write(true)
-                .custom_flags(libc::O_CLOEXEC | libc::O_NONBLOCK)
-                .open(VHOST_PATH)
-                .map_err(Error::VhostOpen)?,
-            mem: mem.clone(),
-            _phatomdata: PhantomData,
-        })
-    }
-
-    /// Set the CID for the guest.  This number is used for routing all data destined for
-    /// running in the guest. Each guest on a hypervisor must have an unique CID
-    ///
-    /// # Arguments
-    /// * `cid` - CID to assign to the guest
-    pub fn set_guest_cid(&self, cid: u64) -> Result<()> {
-        let ret = unsafe { ioctl_with_ref(&self.fd, VHOST_VSOCK_SET_GUEST_CID(), &cid) };
-        ioctl_result(ret, ())
-    }
-
-    /// Tell the VHOST driver to start performing data transfer.
-    pub fn start(&self) -> Result<()> {
-        self.set_running(true)
-    }
-
-    /// Tell the VHOST driver to stop performing data transfer.
-    pub fn stop(&self) -> Result<()> {
-        self.set_running(false)
-    }
-
-    fn set_running(&self, running: bool) -> Result<()> {
-        let on: ::std::os::raw::c_int = if running { 1 } else { 0 };
-        let ret = unsafe { ioctl_with_ref(&self.fd, VHOST_VSOCK_SET_RUNNING(), &on) };
-        ioctl_result(ret, ())
-    }
-}
-
-impl<'a, M: GuestMemory<'a>> VhostKernBackend<'a> for Vsock<'a, M> {
-    type M = M;
-
-    fn mem(&self) -> &Self::M {
-        &self.mem
-    }
-}
-
-impl<'a, M: GuestMemory<'a>> AsRawFd for Vsock<'a, M> {
-    fn as_raw_fd(&self) -> RawFd {
-        self.fd.as_raw_fd()
-    }
-}

vhost_rs/src/vhost_user/connection.rs

@@ -1,737 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-//! Structs for Unix Domain Socket listener and endpoint.
-
-#![allow(dead_code)]
-
-use libc::{c_void, iovec};
-use std::io::ErrorKind;
-use std::marker::PhantomData;
-use std::os::unix::io::{AsRawFd, RawFd};
-use std::os::unix::net::{UnixListener, UnixStream};
-use std::{mem, slice};
-
-use super::message::*;
-use super::sock_ctrl_msg::ScmSocket;
-use super::{Error, Result};
-
-/// Unix domain socket listener for accepting incoming connections.
-pub struct Listener {
-    fd: UnixListener,
-    path: String,
-}
-
-impl Listener {
-    /// Create a unix domain socket listener.
-    ///
-    /// # Return:
-    /// * - the new Listener object on success.
-    /// * - SocketError: failed to create listener socket.
-    pub fn new(path: &str, unlink: bool) -> Result<Self> {
-        if unlink {
-            let _ = std::fs::remove_file(path);
-        }
-        let fd = UnixListener::bind(path).map_err(Error::SocketError)?;
-        Ok(Listener {
-            fd,
-            path: path.to_string(),
-        })
-    }
-
-    /// Accept an incoming connection.
-    ///
-    /// # Return:
-    /// * - Some(UnixStream): new UnixStream object if new incoming connection is available.
-    /// * - None: no incoming connection available.
-    /// * - SocketError: errors from accept().
-    pub fn accept(&self) -> Result<Option<UnixStream>> {
-        loop {
-            match self.fd.accept() {
-                Ok((socket, _addr)) => return Ok(Some(socket)),
-                Err(e) => {
-                    match e.kind() {
-                        // No incoming connection available.
-                        ErrorKind::WouldBlock => return Ok(None),
-                        // New connection closed by peer.
-                        ErrorKind::ConnectionAborted => return Ok(None),
-                        // Interrupted by signals, retry
-                        ErrorKind::Interrupted => continue,
-                        _ => return Err(Error::SocketError(e)),
-                    }
-                }
-            }
-        }
-    }
-
-    /// Change blocking status on the listener.
-    ///
-    /// # Return:
-    /// * - () on success.
-    /// * - SocketError: failure from set_nonblocking().
-    pub fn set_nonblocking(&self, block: bool) -> Result<()> {
-        self.fd.set_nonblocking(block).map_err(Error::SocketError)
-    }
-}
-
-impl AsRawFd for Listener {
-    fn as_raw_fd(&self) -> RawFd {
-        self.fd.as_raw_fd()
-    }
-}
-
-impl Drop for Listener {
-    fn drop(&mut self) {
-        let _ = std::fs::remove_file(self.path.clone());
-    }
-}
-
-/// Unix domain socket endpoint for vhost-user connection.
-pub(super) struct Endpoint<R: Req> {
-    sock: UnixStream,
-    _r: PhantomData<R>,
-}
-
-impl<R: Req> Endpoint<R> {
-    /// Create a new stream by connecting to server at `str`.
-    ///
-    /// # Return:
-    /// * - the new Endpoint object on success.
-    /// * - SocketConnect: failed to connect to peer.
-    pub fn connect(path: &str) -> Result<Self> {
-        let sock = UnixStream::connect(path).map_err(Error::SocketConnect)?;
-        Ok(Self::from_stream(sock))
-    }
-
-    /// Create an endpoint from a stream object.
-    pub fn from_stream(sock: UnixStream) -> Self {
-        Endpoint {
-            sock,
-            _r: PhantomData,
-        }
-    }
-
-    /// Sends bytes from scatter-gather vectors over the socket with optional attached file
-    /// descriptors.
-    ///
-    /// # Return:
-    /// * - number of bytes sent on success
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    pub fn send_iovec(&mut self, iovs: &[&[u8]], fds: Option<&[RawFd]>) -> Result<usize> {
-        let rfds = match fds {
-            Some(rfds) => rfds,
-            _ => &[],
-        };
-        self.sock.send_with_fds(iovs, rfds).map_err(Into::into)
-    }
-
-    /// Sends bytes from a slice over the socket with optional attached file descriptors.
-    ///
-    /// # Return:
-    /// * - number of bytes sent on success
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    pub fn send_slice(&mut self, data: &[u8], fds: Option<&[RawFd]>) -> Result<usize> {
-        self.send_iovec(&[data], fds)
-    }
-
-    /// Sends a header-only message with optional attached file descriptors.
-    ///
-    /// # Return:
-    /// * - number of bytes sent on success
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    /// * - PartialMessage: received a partial message.
-    pub fn send_header(
-        &mut self,
-        hdr: &VhostUserMsgHeader<R>,
-        fds: Option<&[RawFd]>,
-    ) -> Result<()> {
-        // Safe because there can't be other mutable referance to hdr.
-        let iovs = unsafe {
-            [slice::from_raw_parts(
-                hdr as *const VhostUserMsgHeader<R> as *const u8,
-                mem::size_of::<VhostUserMsgHeader<R>>(),
-            )]
-        };
-        let bytes = self.send_iovec(&iovs[..], fds)?;
-        if bytes != mem::size_of::<VhostUserMsgHeader<R>>() {
-            return Err(Error::PartialMessage);
-        }
-        Ok(())
-    }
-
-    /// Send a message with header and body. Optional file descriptors may be attached to
-    /// the message.
-    ///
-    /// # Return:
-    /// * - number of bytes sent on success
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    /// * - PartialMessage: received a partial message.
-    pub fn send_message<T: Sized>(
-        &mut self,
-        hdr: &VhostUserMsgHeader<R>,
-        body: &T,
-        fds: Option<&[RawFd]>,
-    ) -> Result<()> {
-        // Safe because there can't be other mutable referance to hdr and body.
-        let iovs = unsafe {
-            [
-                slice::from_raw_parts(
-                    hdr as *const VhostUserMsgHeader<R> as *const u8,
-                    mem::size_of::<VhostUserMsgHeader<R>>(),
-                ),
-                slice::from_raw_parts(body as *const T as *const u8, mem::size_of::<T>()),
-            ]
-        };
-        let bytes = self.send_iovec(&iovs[..], fds)?;
-        if bytes != mem::size_of::<VhostUserMsgHeader<R>>() + mem::size_of::<T>() {
-            return Err(Error::PartialMessage);
-        }
-        Ok(())
-    }
-
-    /// Send a message with header, body and payload. Optional file descriptors
-    /// may also be attached to the message.
-    ///
-    /// # Return:
-    /// * - number of bytes sent on success
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    /// * - OversizedMsg: message size is too big.
-    /// * - PartialMessage: received a partial message.
-    /// * - IncorrectFds: wrong number of attached fds.
-    pub fn send_message_with_payload<T: Sized, P: Sized>(
-        &mut self,
-        hdr: &VhostUserMsgHeader<R>,
-        body: &T,
-        payload: &[P],
-        fds: Option<&[RawFd]>,
-    ) -> Result<()> {
-        let len = payload.len() * mem::size_of::<P>();
-        if len > MAX_MSG_SIZE - mem::size_of::<T>() {
-            return Err(Error::OversizedMsg);
-        }
-        if let Some(fd_arr) = fds {
-            if fd_arr.len() > MAX_ATTACHED_FD_ENTRIES {
-                return Err(Error::IncorrectFds);
-            }
-        }
-
-        // Safe because there can't be other mutable reference to hdr, body and payload.
-        let iovs = unsafe {
-            [
-                slice::from_raw_parts(
-                    hdr as *const VhostUserMsgHeader<R> as *const u8,
-                    mem::size_of::<VhostUserMsgHeader<R>>(),
-                ),
-                slice::from_raw_parts(body as *const T as *const u8, mem::size_of::<T>()),
-                slice::from_raw_parts(payload.as_ptr() as *const u8, len),
-            ]
-        };
-        let total = mem::size_of::<VhostUserMsgHeader<R>>() + mem::size_of::<T>() + len;
-        let len = self.send_iovec(&iovs, fds)?;
-        if len != total {
-            return Err(Error::PartialMessage);
-        }
-        Ok(())
-    }
-
-    /// Reads bytes from the socket into the given scatter/gather vectors.
-    ///
-    /// # Return:
-    /// * - (number of bytes received, buf) on success
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    pub fn recv_data(&mut self, len: usize) -> Result<(usize, Vec<u8>)> {
-        let mut rbuf = vec![0u8; len];
-        let mut iovs = [iovec {
-            iov_base: rbuf.as_mut_ptr() as *mut c_void,
-            iov_len: len,
-        }];
-        let (bytes, _) = self.sock.recv_with_fds(&mut iovs, &mut [])?;
-        Ok((bytes, rbuf))
-    }
-
-    /// Reads bytes from the socket into the given scatter/gather vectors with optional attached
-    /// file descriptors.
-    ///
-    /// The underlying communication channel is a Unix domain socket in STREAM mode. It's a little
-    /// tricky to pass file descriptors through such a communication channel. Let's assume that a
-    /// sender sending a message with some file descriptors attached. To successfully receive those
-    /// attached file descriptors, the receiver must obey following rules:
-    ///   1) file descriptors are attached to a message.
-    ///   2) message(packet) boundaries must be respected on the receive side.
-    /// In other words, recvmsg() operations must not cross the packet boundary, otherwise the
-    /// attached file descriptors will get lost.
-    ///
-    /// # Return:
-    /// * - (number of bytes received, [received fds]) on success
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    pub fn recv_into_iovec(&mut self, iovs: &mut [iovec]) -> Result<(usize, Option<Vec<RawFd>>)> {
-        let mut fd_array = vec![0; MAX_ATTACHED_FD_ENTRIES];
-        let (bytes, fds) = self.sock.recv_with_fds(iovs, &mut fd_array)?;
-        let rfds = match fds {
-            0 => None,
-            n => {
-                let mut fds = Vec::with_capacity(n);
-                fds.extend_from_slice(&fd_array[0..n]);
-                Some(fds)
-            }
-        };
-
-        Ok((bytes, rfds))
-    }
-
-    /// Reads bytes from the socket into a new buffer with optional attached
-    /// file descriptors. Received file descriptors are set close-on-exec.
-    ///
-    /// # Return:
-    /// * - (number of bytes received, buf, [received fds]) on success.
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    pub fn recv_into_buf(
-        &mut self,
-        buf_size: usize,
-    ) -> Result<(usize, Vec<u8>, Option<Vec<RawFd>>)> {
-        let mut buf = vec![0u8; buf_size];
-        let (bytes, rfds) = {
-            let mut iovs = [iovec {
-                iov_base: buf.as_mut_ptr() as *mut c_void,
-                iov_len: buf_size,
-            }];
-            self.recv_into_iovec(&mut iovs)?
-        };
-        Ok((bytes, buf, rfds))
-    }
-
-    /// Receive a header-only message with optional attached file descriptors.
-    /// Note, only the first MAX_ATTACHED_FD_ENTRIES file descriptors will be
-    /// accepted and all other file descriptor will be discard silently.
-    ///
-    /// # Return:
-    /// * - (message header, [received fds]) on success.
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    /// * - PartialMessage: received a partial message.
-    /// * - InvalidMessage: received a invalid message.
-    pub fn recv_header(&mut self) -> Result<(VhostUserMsgHeader<R>, Option<Vec<RawFd>>)> {
-        let mut hdr = VhostUserMsgHeader::default();
-        let mut iovs = [iovec {
-            iov_base: (&mut hdr as *mut VhostUserMsgHeader<R>) as *mut c_void,
-            iov_len: mem::size_of::<VhostUserMsgHeader<R>>(),
-        }];
-        let (bytes, rfds) = self.recv_into_iovec(&mut iovs[..])?;
-
-        if bytes != mem::size_of::<VhostUserMsgHeader<R>>() {
-            return Err(Error::PartialMessage);
-        } else if !hdr.is_valid() {
-            return Err(Error::InvalidMessage);
-        }
-
-        Ok((hdr, rfds))
-    }
-
-    /// Receive a message with optional attached file descriptors.
-    /// Note, only the first MAX_ATTACHED_FD_ENTRIES file descriptors will be
-    /// accepted and all other file descriptor will be discard silently.
-    ///
-    /// # Return:
-    /// * - (message header, message body, [received fds]) on success.
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    /// * - PartialMessage: received a partial message.
-    /// * - InvalidMessage: received a invalid message.
-    pub fn recv_body<T: Sized + Default + VhostUserMsgValidator>(
-        &mut self,
-    ) -> Result<(VhostUserMsgHeader<R>, T, Option<Vec<RawFd>>)> {
-        let mut hdr = VhostUserMsgHeader::default();
-        let mut body: T = Default::default();
-        let mut iovs = [
-            iovec {
-                iov_base: (&mut hdr as *mut VhostUserMsgHeader<R>) as *mut c_void,
-                iov_len: mem::size_of::<VhostUserMsgHeader<R>>(),
-            },
-            iovec {
-                iov_base: (&mut body as *mut T) as *mut c_void,
-                iov_len: mem::size_of::<T>(),
-            },
-        ];
-        let (bytes, rfds) = self.recv_into_iovec(&mut iovs[..])?;
-
-        let total = mem::size_of::<VhostUserMsgHeader<R>>() + mem::size_of::<T>();
-        if bytes != total {
-            return Err(Error::PartialMessage);
-        } else if !hdr.is_valid() || !body.is_valid() {
-            return Err(Error::InvalidMessage);
-        }
-
-        Ok((hdr, body, rfds))
-    }
-
-    /// Receive a message with header and optional content. Callers need to
-    /// pre-allocate a big enough buffer to receive the message body and
-    /// optional payload. If there are attached file descriptor associated
-    /// with the message, the first MAX_ATTACHED_FD_ENTRIES file descriptors
-    /// will be accepted and all other file descriptor will be discard
-    /// silently.
-    ///
-    /// # Return:
-    /// * - (message header, message size, [received fds]) on success.
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    /// * - PartialMessage: received a partial message.
-    /// * - InvalidMessage: received a invalid message.
-    pub fn recv_body_into_buf(
-        &mut self,
-        buf: &mut [u8],
-    ) -> Result<(VhostUserMsgHeader<R>, usize, Option<Vec<RawFd>>)> {
-        let mut hdr = VhostUserMsgHeader::default();
-        let mut iovs = [
-            iovec {
-                iov_base: (&mut hdr as *mut VhostUserMsgHeader<R>) as *mut c_void,
-                iov_len: mem::size_of::<VhostUserMsgHeader<R>>(),
-            },
-            iovec {
-                iov_base: buf.as_mut_ptr() as *mut c_void,
-                iov_len: buf.len(),
-            },
-        ];
-        let (bytes, rfds) = self.recv_into_iovec(&mut iovs[..])?;
-
-        if bytes < mem::size_of::<VhostUserMsgHeader<R>>() {
-            return Err(Error::PartialMessage);
-        } else if !hdr.is_valid() {
-            return Err(Error::InvalidMessage);
-        }
-
-        Ok((hdr, bytes - mem::size_of::<VhostUserMsgHeader<R>>(), rfds))
-    }
-
-    /// Receive a message with optional payload and attached file descriptors.
-    /// Note, only the first MAX_ATTACHED_FD_ENTRIES file descriptors will be
-    /// accepted and all other file descriptor will be discard silently.
-    ///
-    /// # Return:
-    /// * - (message header, message body, size of payload, [received fds]) on success.
-    /// * - SocketRetry: temporary error caused by signals or short of resources.
-    /// * - SocketBroken: the underline socket is broken.
-    /// * - SocketError: other socket related errors.
-    /// * - PartialMessage: received a partial message.
-    /// * - InvalidMessage: received a invalid message.
-    #[cfg_attr(feature = "cargo-clippy", allow(clippy::type_complexity))]
-    pub fn recv_payload_into_buf<T: Sized + Default + VhostUserMsgValidator>(
-        &mut self,
-        buf: &mut [u8],
-    ) -> Result<(VhostUserMsgHeader<R>, T, usize, Option<Vec<RawFd>>)> {
-        let mut hdr = VhostUserMsgHeader::default();
-        let mut body: T = Default::default();
-        let mut iovs = [
-            iovec {
-                iov_base: (&mut hdr as *mut VhostUserMsgHeader<R>) as *mut c_void,
-                iov_len: mem::size_of::<VhostUserMsgHeader<R>>(),
-            },
-            iovec {
-                iov_base: (&mut body as *mut T) as *mut c_void,
-                iov_len: mem::size_of::<T>(),
-            },
-            iovec {
-                iov_base: buf.as_mut_ptr() as *mut c_void,
-                iov_len: buf.len(),
-            },
-        ];
-        let (bytes, rfds) = self.recv_into_iovec(&mut iovs[..])?;
-
-        let total = mem::size_of::<VhostUserMsgHeader<R>>() + mem::size_of::<T>();
-        if bytes < total {
-            return Err(Error::PartialMessage);
-        } else if !hdr.is_valid() || !body.is_valid() {
-            return Err(Error::InvalidMessage);
-        }
-
-        Ok((hdr, body, bytes - total, rfds))
-    }
-
-    /// Close all raw file descriptors.
-    pub fn close_rfds(rfds: Option<Vec<RawFd>>) {
-        if let Some(fds) = rfds {
-            for fd in fds {
-                // safe because the rawfds are valid and we don't care about the result.
-                let _ = unsafe { libc::close(fd) };
-            }
-        }
-    }
-}
-
-impl<T: Req> AsRawFd for Endpoint<T> {
-    fn as_raw_fd(&self) -> RawFd {
-        self.sock.as_raw_fd()
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    extern crate tempfile;
-
-    use self::tempfile::tempfile;
-    use super::*;
-    use libc;
-    use std::fs::File;
-    use std::io::{Read, Seek, SeekFrom, Write};
-    use std::os::unix::io::FromRawFd;
-
-    const UNIX_SOCKET_LISTENER: &'static str = "/tmp/vhost_user_test_rust_listener";
-    const UNIX_SOCKET_CONNECTION: &'static str = "/tmp/vhost_user_test_rust_connection";
-    const UNIX_SOCKET_DATA: &'static str = "/tmp/vhost_user_test_rust_data";
-    const UNIX_SOCKET_FD: &'static str = "/tmp/vhost_user_test_rust_fd";
-    const UNIX_SOCKET_SEND: &'static str = "/tmp/vhost_user_test_rust_send";
-
-    #[test]
-    fn create_listener() {
-        let _ = Listener::new(UNIX_SOCKET_LISTENER, true).unwrap();
-    }
-
-    #[test]
-    fn accept_connection() {
-        let listener = Listener::new(UNIX_SOCKET_CONNECTION, true).unwrap();
-        listener.set_nonblocking(true).unwrap();
-
-        // accept on a fd without incoming connection
-        let conn = listener.accept().unwrap();
-        assert!(conn.is_none());
-
-        listener.set_nonblocking(true).unwrap();
-
-        // accept on a closed fd
-        unsafe {
-            libc::close(listener.as_raw_fd());
-        }
-        let conn2 = listener.accept();
-        assert!(conn2.is_err());
-    }
-
-    #[test]
-    fn send_data() {
-        let listener = Listener::new(UNIX_SOCKET_DATA, true).unwrap();
-        listener.set_nonblocking(true).unwrap();
-        let mut master = Endpoint::<MasterReq>::connect(UNIX_SOCKET_DATA).unwrap();
-        let sock = listener.accept().unwrap().unwrap();
-        let mut slave = Endpoint::<MasterReq>::from_stream(sock);
-
-        let buf1 = vec![0x1, 0x2, 0x3, 0x4];
-        let mut len = master.send_slice(&buf1[..], None).unwrap();
-        assert_eq!(len, 4);
-        let (bytes, buf2, _) = slave.recv_into_buf(0x1000).unwrap();
-        assert_eq!(bytes, 4);
-        assert_eq!(&buf1[..], &buf2[..bytes]);
-
-        len = master.send_slice(&buf1[..], None).unwrap();
-        assert_eq!(len, 4);
-        let (bytes, buf2, _) = slave.recv_into_buf(0x2).unwrap();
-        assert_eq!(bytes, 2);
-        assert_eq!(&buf1[..2], &buf2[..]);
-        let (bytes, buf2, _) = slave.recv_into_buf(0x2).unwrap();
-        assert_eq!(bytes, 2);
-        assert_eq!(&buf1[2..], &buf2[..]);
-    }
-
-    #[test]
-    fn send_fd() {
-        let listener = Listener::new(UNIX_SOCKET_FD, true).unwrap();
-        listener.set_nonblocking(true).unwrap();
-        let mut master = Endpoint::<MasterReq>::connect(UNIX_SOCKET_FD).unwrap();
-        let sock = listener.accept().unwrap().unwrap();
-        let mut slave = Endpoint::<MasterReq>::from_stream(sock);
-
-        let mut fd = tempfile().unwrap();
-        write!(fd, "test").unwrap();
-
-        // Normal case for sending/receiving file descriptors
-        let buf1 = vec![0x1, 0x2, 0x3, 0x4];
-        let len = master
-            .send_slice(&buf1[..], Some(&[fd.as_raw_fd()]))
-            .unwrap();
-        assert_eq!(len, 4);
-
-        let (bytes, buf2, rfds) = slave.recv_into_buf(4).unwrap();
-        assert_eq!(bytes, 4);
-        assert_eq!(&buf1[..], &buf2[..]);
-        assert!(rfds.is_some());
-        let fds = rfds.unwrap();
-        {
-            assert_eq!(fds.len(), 1);
-            let mut file = unsafe { File::from_raw_fd(fds[0]) };
-            let mut content = String::new();
-            file.seek(SeekFrom::Start(0)).unwrap();
-            file.read_to_string(&mut content).unwrap();
-            assert_eq!(content, "test");
-        }
-
-        // Following communication pattern should work:
-        // Sending side: data(header, body) with fds
-        // Receiving side: data(header) with fds, data(body)
-        let len = master
-            .send_slice(
-                &buf1[..],
-                Some(&[fd.as_raw_fd(), fd.as_raw_fd(), fd.as_raw_fd()]),
-            )
-            .unwrap();
-        assert_eq!(len, 4);
-
-        let (bytes, buf2, rfds) = slave.recv_into_buf(0x2).unwrap();
-        assert_eq!(bytes, 2);
-        assert_eq!(&buf1[..2], &buf2[..]);
-        assert!(rfds.is_some());
-        let fds = rfds.unwrap();
-        {
-            assert_eq!(fds.len(), 3);
-            let mut file = unsafe { File::from_raw_fd(fds[1]) };
-            let mut content = String::new();
-            file.seek(SeekFrom::Start(0)).unwrap();
-            file.read_to_string(&mut content).unwrap();
-            assert_eq!(content, "test");
-        }
-        let (bytes, buf2, rfds) = slave.recv_into_buf(0x2).unwrap();
-        assert_eq!(bytes, 2);
-        assert_eq!(&buf1[2..], &buf2[..]);
-        assert!(rfds.is_none());
-
-        // Following communication pattern should not work:
-        // Sending side: data(header, body) with fds
-        // Receiving side: data(header), data(body) with fds
-        let len = master
-            .send_slice(
-                &buf1[..],
-                Some(&[fd.as_raw_fd(), fd.as_raw_fd(), fd.as_raw_fd()]),
-            )
-            .unwrap();
-        assert_eq!(len, 4);
-
-        let (bytes, buf4) = slave.recv_data(2).unwrap();
-        assert_eq!(bytes, 2);
-        assert_eq!(&buf1[..2], &buf4[..]);
-        let (bytes, buf2, rfds) = slave.recv_into_buf(0x2).unwrap();
-        assert_eq!(bytes, 2);
-        assert_eq!(&buf1[2..], &buf2[..]);
-        assert!(rfds.is_none());
-
-        // Following communication pattern should work:
-        // Sending side: data, data with fds
-        // Receiving side: data, data with fds
-        let len = master.send_slice(&buf1[..], None).unwrap();
-        assert_eq!(len, 4);
-        let len = master
-            .send_slice(
-                &buf1[..],
-                Some(&[fd.as_raw_fd(), fd.as_raw_fd(), fd.as_raw_fd()]),
-            )
-            .unwrap();
-        assert_eq!(len, 4);
-
-        let (bytes, buf2, rfds) = slave.recv_into_buf(0x4).unwrap();
-        assert_eq!(bytes, 4);
-        assert_eq!(&buf1[..], &buf2[..]);
-        assert!(rfds.is_none());
-
-        let (bytes, buf2, rfds) = slave.recv_into_buf(0x2).unwrap();
-        assert_eq!(bytes, 2);
-        assert_eq!(&buf1[..2], &buf2[..]);
-        assert!(rfds.is_some());
-        let fds = rfds.unwrap();
-        {
-            assert_eq!(fds.len(), 3);
-            let mut file = unsafe { File::from_raw_fd(fds[1]) };
-            let mut content = String::new();
-            file.seek(SeekFrom::Start(0)).unwrap();
-            file.read_to_string(&mut content).unwrap();
-            assert_eq!(content, "test");
-        }
-        let (bytes, buf2, rfds) = slave.recv_into_buf(0x2).unwrap();
-        assert_eq!(bytes, 2);
-        assert_eq!(&buf1[2..], &buf2[..]);
-        assert!(rfds.is_none());
-
-        // Following communication pattern should not work:
-        // Sending side: data1, data2 with fds
-        // Receiving side: data + partial of data2, left of data2 with fds
-        let len = master.send_slice(&buf1[..], None).unwrap();
-        assert_eq!(len, 4);
-        let len = master
-            .send_slice(
-                &buf1[..],
-                Some(&[fd.as_raw_fd(), fd.as_raw_fd(), fd.as_raw_fd()]),
-            )
-            .unwrap();
-        assert_eq!(len, 4);
-
-        let (bytes, _) = slave.recv_data(5).unwrap();
-        assert_eq!(bytes, 5);
-
-        let (bytes, _, rfds) = slave.recv_into_buf(0x4).unwrap();
-        assert_eq!(bytes, 3);
-        assert!(rfds.is_none());
-
-        // If the target fd array is too small, extra file descriptors will get lost.
-        let len = master
-            .send_slice(
-                &buf1[..],
-                Some(&[fd.as_raw_fd(), fd.as_raw_fd(), fd.as_raw_fd()]),
-            )
-            .unwrap();
-        assert_eq!(len, 4);
-
-        let (bytes, _, rfds) = slave.recv_into_buf(0x4).unwrap();
-        assert_eq!(bytes, 4);
-        assert!(rfds.is_some());
-
-        Endpoint::<MasterReq>::close_rfds(rfds);
-        Endpoint::<MasterReq>::close_rfds(None);
-    }
-
-    #[test]
-    fn send_recv() {
-        let listener = Listener::new(UNIX_SOCKET_SEND, true).unwrap();
-        listener.set_nonblocking(true).unwrap();
-        let mut master = Endpoint::<MasterReq>::connect(UNIX_SOCKET_SEND).unwrap();
-        let sock = listener.accept().unwrap().unwrap();
-        let mut slave = Endpoint::<MasterReq>::from_stream(sock);
-
-        let mut hdr1 =
-            VhostUserMsgHeader::new(MasterReq::GET_FEATURES, 0, mem::size_of::<u64>() as u32);
-        hdr1.set_need_reply(true);
-        let features1 = 0x1u64;
-        master.send_message(&hdr1, &features1, None).unwrap();
-
-        let mut features2 = 0u64;
-        let slice = unsafe {
-            slice::from_raw_parts_mut(
-                (&mut features2 as *mut u64) as *mut u8,
-                mem::size_of::<u64>(),
-            )
-        };
-        let (hdr2, bytes, rfds) = slave.recv_body_into_buf(slice).unwrap();
-        assert_eq!(hdr1, hdr2);
-        assert_eq!(bytes, 8);
-        assert_eq!(features1, features2);
-        assert!(rfds.is_none());
-
-        master.send_header(&hdr1, None).unwrap();
-        let (hdr2, rfds) = slave.recv_header().unwrap();
-        assert_eq!(hdr1, hdr2);
-        assert!(rfds.is_none());
-    }
-}

vhost_rs/src/vhost_user/dummy_slave.rs

@@ -1,250 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-use super::message::*;
-use super::*;
-use std::os::unix::io::RawFd;
-
-pub const MAX_QUEUE_NUM: usize = 2;
-pub const MAX_VRING_NUM: usize = 256;
-pub const VIRTIO_FEATURES: u64 = 0x40000003;
-
-#[derive(Default)]
-pub struct DummySlaveReqHandler {
-    pub owned: bool,
-    pub features_acked: bool,
-    pub acked_features: u64,
-    pub acked_protocol_features: u64,
-    pub queue_num: usize,
-    pub vring_num: [u32; MAX_QUEUE_NUM],
-    pub vring_base: [u32; MAX_QUEUE_NUM],
-    pub call_fd: [Option<RawFd>; MAX_QUEUE_NUM],
-    pub kick_fd: [Option<RawFd>; MAX_QUEUE_NUM],
-    pub err_fd: [Option<RawFd>; MAX_QUEUE_NUM],
-    pub vring_started: [bool; MAX_QUEUE_NUM],
-    pub vring_enabled: [bool; MAX_QUEUE_NUM],
-}
-
-impl DummySlaveReqHandler {
-    pub fn new() -> Self {
-        DummySlaveReqHandler {
-            queue_num: MAX_QUEUE_NUM,
-            ..Default::default()
-        }
-    }
-}
-
-impl VhostUserSlaveReqHandler for DummySlaveReqHandler {
-    fn set_owner(&mut self) -> Result<()> {
-        if self.owned {
-            return Err(Error::InvalidOperation);
-        }
-        self.owned = true;
-        Ok(())
-    }
-
-    fn reset_owner(&mut self) -> Result<()> {
-        self.owned = false;
-        self.features_acked = false;
-        self.acked_features = 0;
-        self.acked_protocol_features = 0;
-        Ok(())
-    }
-
-    fn get_features(&mut self) -> Result<u64> {
-        Ok(VIRTIO_FEATURES)
-    }
-
-    fn set_features(&mut self, features: u64) -> Result<()> {
-        if !self.owned {
-            return Err(Error::InvalidOperation);
-        } else if self.features_acked {
-            return Err(Error::InvalidOperation);
-        } else if (features & !VIRTIO_FEATURES) != 0 {
-            return Err(Error::InvalidParam);
-        }
-
-        self.acked_features = features;
-        self.features_acked = true;
-
-        // If VHOST_USER_F_PROTOCOL_FEATURES has not been negotiated,
-        // the ring is initialized in an enabled state.
-        // If VHOST_USER_F_PROTOCOL_FEATURES has been negotiated,
-        // the ring is initialized in a disabled state. Client must not
-        // pass data to/from the backend until ring is enabled by
-        // VHOST_USER_SET_VRING_ENABLE with parameter 1, or after it has
-        // been disabled by VHOST_USER_SET_VRING_ENABLE with parameter 0.
-        let vring_enabled =
-            self.acked_features & VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits() == 0;
-        for enabled in &mut self.vring_enabled {
-            *enabled = vring_enabled;
-        }
-
-        Ok(())
-    }
-
-    fn get_protocol_features(&mut self) -> Result<VhostUserProtocolFeatures> {
-        Ok(VhostUserProtocolFeatures::all())
-    }
-
-    fn set_protocol_features(&mut self, features: u64) -> Result<()> {
-        // Note: slave that reported VHOST_USER_F_PROTOCOL_FEATURES must
-        // support this message even before VHOST_USER_SET_FEATURES was
-        // called.
-        // What happens if the master calls set_features() with
-        // VHOST_USER_F_PROTOCOL_FEATURES cleared after calling this
-        // interface?
-        self.acked_protocol_features = features;
-        Ok(())
-    }
-
-    fn set_mem_table(&mut self, _ctx: &[VhostUserMemoryRegion], _fds: &[RawFd]) -> Result<()> {
-        // TODO
-        Ok(())
-    }
-
-    fn get_queue_num(&mut self) -> Result<u64> {
-        Ok(MAX_QUEUE_NUM as u64)
-    }
-
-    fn set_vring_num(&mut self, index: u32, num: u32) -> Result<()> {
-        if index as usize >= self.queue_num || num == 0 || num as usize > MAX_VRING_NUM {
-            return Err(Error::InvalidParam);
-        }
-        self.vring_num[index as usize] = num;
-        Ok(())
-    }
-
-    fn set_vring_addr(
-        &mut self,
-        index: u32,
-        _flags: VhostUserVringAddrFlags,
-        _descriptor: u64,
-        _used: u64,
-        _available: u64,
-        _log: u64,
-    ) -> Result<()> {
-        if index as usize >= self.queue_num {
-            return Err(Error::InvalidParam);
-        }
-        Ok(())
-    }
-
-    fn set_vring_base(&mut self, index: u32, base: u32) -> Result<()> {
-        if index as usize >= self.queue_num || base as usize >= MAX_VRING_NUM {
-            return Err(Error::InvalidParam);
-        }
-        self.vring_base[index as usize] = base;
-        Ok(())
-    }
-
-    fn get_vring_base(&mut self, index: u32) -> Result<VhostUserVringState> {
-        if index as usize >= self.queue_num {
-            return Err(Error::InvalidParam);
-        }
-        // Quotation from vhost-user spec:
-        // Client must start ring upon receiving a kick (that is, detecting
-        // that file descriptor is readable) on the descriptor specified by
-        // VHOST_USER_SET_VRING_KICK, and stop ring upon receiving
-        // VHOST_USER_GET_VRING_BASE.
-        self.vring_started[index as usize] = false;
-        Ok(VhostUserVringState::new(
-            index,
-            self.vring_base[index as usize],
-        ))
-    }
-
-    fn set_vring_kick(&mut self, index: u8, fd: Option<RawFd>) -> Result<()> {
-        if index as usize >= self.queue_num || index as usize > self.queue_num {
-            return Err(Error::InvalidParam);
-        }
-        if self.kick_fd[index as usize].is_some() {
-            // Close file descriptor set by previous operations.
-            let _ = unsafe { libc::close(self.kick_fd[index as usize].unwrap()) };
-        }
-        self.kick_fd[index as usize] = fd;
-
-        // Quotation from vhost-user spec:
-        // Client must start ring upon receiving a kick (that is, detecting
-        // that file descriptor is readable) on the descriptor specified by
-        // VHOST_USER_SET_VRING_KICK, and stop ring upon receiving
-        // VHOST_USER_GET_VRING_BASE.
-        //
-        // So we should add fd to event monitor(select, poll, epoll) here.
-        self.vring_started[index as usize] = true;
-        Ok(())
-    }
-
-    fn set_vring_call(&mut self, index: u8, fd: Option<RawFd>) -> Result<()> {
-        if index as usize >= self.queue_num || index as usize > self.queue_num {
-            return Err(Error::InvalidParam);
-        }
-        if self.call_fd[index as usize].is_some() {
-            // Close file descriptor set by previous operations.
-            let _ = unsafe { libc::close(self.call_fd[index as usize].unwrap()) };
-        }
-        self.call_fd[index as usize] = fd;
-        Ok(())
-    }
-
-    fn set_vring_err(&mut self, index: u8, fd: Option<RawFd>) -> Result<()> {
-        if index as usize >= self.queue_num || index as usize > self.queue_num {
-            return Err(Error::InvalidParam);
-        }
-        if self.err_fd[index as usize].is_some() {
-            // Close file descriptor set by previous operations.
-            let _ = unsafe { libc::close(self.err_fd[index as usize].unwrap()) };
-        }
-        self.err_fd[index as usize] = fd;
-        Ok(())
-    }
-
-    fn set_vring_enable(&mut self, index: u32, enable: bool) -> Result<()> {
-        // This request should be handled only when VHOST_USER_F_PROTOCOL_FEATURES
-        // has been negotiated.
-        if self.acked_features & VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits() == 0 {
-            return Err(Error::InvalidOperation);
-        } else if index as usize >= self.queue_num || index as usize > self.queue_num {
-            return Err(Error::InvalidParam);
-        }
-
-        // Slave must not pass data to/from the backend until ring is
-        // enabled by VHOST_USER_SET_VRING_ENABLE with parameter 1,
-        // or after it has been disabled by VHOST_USER_SET_VRING_ENABLE
-        // with parameter 0.
-        self.vring_enabled[index as usize] = enable;
-        Ok(())
-    }
-
-    fn get_config(
-        &mut self,
-        offset: u32,
-        size: u32,
-        _flags: VhostUserConfigFlags,
-    ) -> Result<Vec<u8>> {
-        if self.acked_features & VhostUserProtocolFeatures::CONFIG.bits() == 0 {
-            return Err(Error::InvalidOperation);
-        } else if offset < VHOST_USER_CONFIG_OFFSET
-            || offset >= VHOST_USER_CONFIG_SIZE
-            || size > VHOST_USER_CONFIG_SIZE - VHOST_USER_CONFIG_OFFSET
-            || size + offset > VHOST_USER_CONFIG_SIZE
-        {
-            return Err(Error::InvalidParam);
-        }
-        Ok(vec![0xa5; size as usize])
-    }
-
-    fn set_config(&mut self, offset: u32, buf: &[u8], _flags: VhostUserConfigFlags) -> Result<()> {
-        let size = buf.len() as u32;
-        if self.acked_features & VhostUserProtocolFeatures::CONFIG.bits() == 0 {
-            return Err(Error::InvalidOperation);
-        } else if offset < VHOST_USER_CONFIG_OFFSET
-            || offset >= VHOST_USER_CONFIG_SIZE
-            || size > VHOST_USER_CONFIG_SIZE - VHOST_USER_CONFIG_OFFSET
-            || size + offset > VHOST_USER_CONFIG_SIZE
-        {
-            return Err(Error::InvalidParam);
-        }
-        Ok(())
-    }
-}

vhost_rs/src/vhost_user/master.rs

@@ -1,762 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-//! Traits and Struct for vhost-user master.
-
-use std::mem;
-use std::os::unix::io::{AsRawFd, RawFd};
-use std::os::unix::net::UnixStream;
-use std::sync::{Arc, Mutex};
-
-use vmm_sys_util::eventfd::EventFd;
-
-use super::connection::Endpoint;
-use super::message::*;
-use super::{Error as VhostUserError, Result as VhostUserResult};
-use crate::backend::{VhostBackend, VhostUserMemoryRegionInfo, VringConfigData};
-use crate::{Error, Result};
-
-/// Trait for vhost-user master to provide extra methods not covered by the VhostBackend yet.
-pub trait VhostUserMaster: VhostBackend {
-    /// Get the protocol feature bitmask from the underlying vhost implementation.
-    fn get_protocol_features(&mut self) -> Result<VhostUserProtocolFeatures>;
-
-    /// Enable protocol features in the underlying vhost implementation.
-    fn set_protocol_features(&mut self, features: VhostUserProtocolFeatures) -> Result<()>;
-
-    /// Query how many queues the backend supports.
-    fn get_queue_num(&mut self) -> Result<u64>;
-
-    /// Signal slave to enable or disable corresponding vring.
-    ///
-    /// Slave must not pass data to/from the backend until ring is enabled by
-    /// VHOST_USER_SET_VRING_ENABLE with parameter 1, or after it has been
-    /// disabled by VHOST_USER_SET_VRING_ENABLE with parameter 0.
-    fn set_vring_enable(&mut self, queue_index: usize, enable: bool) -> Result<()>;
-
-    /// Fetch the contents of the virtio device configuration space.
-    fn get_config(
-        &mut self,
-        offset: u32,
-        size: u32,
-        flags: VhostUserConfigFlags,
-        buf: &[u8],
-    ) -> Result<(VhostUserConfig, VhostUserConfigPayload)>;
-
-    /// Change the virtio device configuration space. It also can be used for live migration on the
-    /// destination host to set readonly configuration space fields.
-    fn set_config(&mut self, offset: u32, flags: VhostUserConfigFlags, buf: &[u8]) -> Result<()>;
-
-    /// Setup slave communication channel.
-    fn set_slave_request_fd(&mut self, fd: RawFd) -> Result<()>;
-}
-
-fn error_code<T>(err: VhostUserError) -> Result<T> {
-    Err(Error::VhostUserProtocol(err))
-}
-
-/// Struct for the vhost-user master endpoint.
-#[derive(Clone)]
-pub struct Master {
-    node: Arc<Mutex<MasterInternal>>,
-}
-
-impl Master {
-    /// Create a new instance.
-    fn new(ep: Endpoint<MasterReq>, max_queue_num: u64) -> Self {
-        Master {
-            node: Arc::new(Mutex::new(MasterInternal {
-                main_sock: ep,
-                virtio_features: 0,
-                acked_virtio_features: 0,
-                protocol_features: 0,
-                acked_protocol_features: 0,
-                protocol_features_ready: false,
-                max_queue_num,
-                error: None,
-            })),
-        }
-    }
-
-    /// Create a new instance from a Unix stream socket.
-    pub fn from_stream(sock: UnixStream, max_queue_num: u64) -> Self {
-        Self::new(Endpoint::<MasterReq>::from_stream(sock), max_queue_num)
-    }
-
-    /// Create a new vhost-user master endpoint.
-    ///
-    /// # Arguments
-    /// * `path` - path of Unix domain socket listener to connect to
-    pub fn connect(path: &str, max_queue_num: u64) -> Result<Self> {
-        Ok(Self::new(
-            Endpoint::<MasterReq>::connect(path)?,
-            max_queue_num,
-        ))
-    }
-}
-
-impl VhostBackend for Master {
-    /// Get from the underlying vhost implementation the feature bitmask.
-    fn get_features(&mut self) -> Result<u64> {
-        let mut node = self.node.lock().unwrap();
-        let hdr = node.send_request_header(MasterReq::GET_FEATURES, None)?;
-        let val = node.recv_reply::<VhostUserU64>(&hdr)?;
-        node.virtio_features = val.value;
-        Ok(node.virtio_features)
-    }
-
-    /// Enable features in the underlying vhost implementation using a bitmask.
-    fn set_features(&mut self, features: u64) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        let val = VhostUserU64::new(features);
-        let _ = node.send_request_with_body(MasterReq::SET_FEATURES, &val, None)?;
-        // Don't wait for ACK here because the protocol feature negotiation process hasn't been
-        // completed yet.
-        node.acked_virtio_features = features & node.virtio_features;
-        Ok(())
-    }
-
-    /// Set the current Master as an owner of the session.
-    fn set_owner(&mut self) -> Result<()> {
-        // We unwrap() the return value to assert that we are not expecting threads to ever fail
-        // while holding the lock.
-        let mut node = self.node.lock().unwrap();
-        let _ = node.send_request_header(MasterReq::SET_OWNER, None)?;
-        // Don't wait for ACK here because the protocol feature negotiation process hasn't been
-        // completed yet.
-        Ok(())
-    }
-
-    fn reset_owner(&mut self) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        let _ = node.send_request_header(MasterReq::RESET_OWNER, None)?;
-        // Don't wait for ACK here because the protocol feature negotiation process hasn't been
-        // completed yet.
-        Ok(())
-    }
-
-    /// Set the memory map regions on the slave so it can translate the vring
-    /// addresses. In the ancillary data there is an array of file descriptors
-    fn set_mem_table(&mut self, regions: &[VhostUserMemoryRegionInfo]) -> Result<()> {
-        if regions.is_empty() || regions.len() > MAX_ATTACHED_FD_ENTRIES {
-            return error_code(VhostUserError::InvalidParam);
-        }
-
-        let mut ctx = VhostUserMemoryContext::new();
-        for region in regions.iter() {
-            if region.memory_size == 0 || region.mmap_handle < 0 {
-                return error_code(VhostUserError::InvalidParam);
-            }
-            let reg = VhostUserMemoryRegion {
-                guest_phys_addr: region.guest_phys_addr,
-                memory_size: region.memory_size,
-                user_addr: region.userspace_addr,
-                mmap_offset: region.mmap_offset,
-            };
-            ctx.append(&reg, region.mmap_handle);
-        }
-
-        let mut node = self.node.lock().unwrap();
-        let body = VhostUserMemory::new(ctx.regions.len() as u32);
-        let hdr = node.send_request_with_payload(
-            MasterReq::SET_MEM_TABLE,
-            &body,
-            ctx.regions.as_slice(),
-            Some(ctx.fds.as_slice()),
-        )?;
-        node.wait_for_ack(&hdr).map_err(|e| e.into())
-    }
-
-    // Clippy doesn't seem to know that if let with && is still experimental
-    #[allow(clippy::unnecessary_unwrap)]
-    fn set_log_base(&mut self, base: u64, fd: Option<RawFd>) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        let val = VhostUserU64::new(base);
-
-        if node.acked_protocol_features & VhostUserProtocolFeatures::LOG_SHMFD.bits() != 0
-            && fd.is_some()
-        {
-            let fds = [fd.unwrap()];
-            let _ = node.send_request_with_body(MasterReq::SET_LOG_BASE, &val, Some(&fds))?;
-        } else {
-            let _ = node.send_request_with_body(MasterReq::SET_LOG_BASE, &val, None)?;
-        }
-        Ok(())
-    }
-
-    fn set_log_fd(&mut self, fd: RawFd) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        let fds = [fd];
-        node.send_request_header(MasterReq::SET_LOG_FD, Some(&fds))?;
-        Ok(())
-    }
-
-    /// Set the size of the queue.
-    fn set_vring_num(&mut self, queue_index: usize, num: u16) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        if queue_index as u64 >= node.max_queue_num {
-            return error_code(VhostUserError::InvalidParam);
-        }
-
-        let val = VhostUserVringState::new(queue_index as u32, num.into());
-        let hdr = node.send_request_with_body(MasterReq::SET_VRING_NUM, &val, None)?;
-        node.wait_for_ack(&hdr).map_err(|e| e.into())
-    }
-
-    /// Sets the addresses of the different aspects of the vring.
-    fn set_vring_addr(&mut self, queue_index: usize, config_data: &VringConfigData) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        if queue_index as u64 >= node.max_queue_num
-            || config_data.flags & !(VhostUserVringAddrFlags::all().bits()) != 0
-        {
-            return error_code(VhostUserError::InvalidParam);
-        }
-
-        let val = VhostUserVringAddr::from_config_data(queue_index as u32, config_data);
-        let hdr = node.send_request_with_body(MasterReq::SET_VRING_ADDR, &val, None)?;
-        node.wait_for_ack(&hdr).map_err(|e| e.into())
-    }
-
-    /// Sets the base offset in the available vring.
-    fn set_vring_base(&mut self, queue_index: usize, base: u16) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        if queue_index as u64 >= node.max_queue_num {
-            return error_code(VhostUserError::InvalidParam);
-        }
-
-        let val = VhostUserVringState::new(queue_index as u32, base.into());
-        let hdr = node.send_request_with_body(MasterReq::SET_VRING_BASE, &val, None)?;
-        node.wait_for_ack(&hdr).map_err(|e| e.into())
-    }
-
-    fn get_vring_base(&mut self, queue_index: usize) -> Result<u32> {
-        let mut node = self.node.lock().unwrap();
-        if queue_index as u64 >= node.max_queue_num {
-            return error_code(VhostUserError::InvalidParam);
-        }
-
-        let req = VhostUserVringState::new(queue_index as u32, 0);
-        let hdr = node.send_request_with_body(MasterReq::GET_VRING_BASE, &req, None)?;
-        let reply = node.recv_reply::<VhostUserVringState>(&hdr)?;
-        Ok(reply.num)
-    }
-
-    /// Set the event file descriptor to signal when buffers are used.
-    /// Bits (0-7) of the payload contain the vring index. Bit 8 is the invalid FD flag. This flag
-    /// is set when there is no file descriptor in the ancillary data. This signals that polling
-    /// will be used instead of waiting for the call.
-    fn set_vring_call(&mut self, queue_index: usize, fd: &EventFd) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        if queue_index as u64 >= node.max_queue_num {
-            return error_code(VhostUserError::InvalidParam);
-        }
-        node.send_fd_for_vring(MasterReq::SET_VRING_CALL, queue_index, fd.as_raw_fd())?;
-        Ok(())
-    }
-
-    /// Set the event file descriptor for adding buffers to the vring.
-    /// Bits (0-7) of the payload contain the vring index. Bit 8 is the invalid FD flag. This flag
-    /// is set when there is no file descriptor in the ancillary data. This signals that polling
-    /// should be used instead of waiting for a kick.
-    fn set_vring_kick(&mut self, queue_index: usize, fd: &EventFd) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        if queue_index as u64 >= node.max_queue_num {
-            return error_code(VhostUserError::InvalidParam);
-        }
-        node.send_fd_for_vring(MasterReq::SET_VRING_KICK, queue_index, fd.as_raw_fd())?;
-        Ok(())
-    }
-
-    /// Set the event file descriptor to signal when error occurs.
-    /// Bits (0-7) of the payload contain the vring index. Bit 8 is the invalid FD flag. This flag
-    /// is set when there is no file descriptor in the ancillary data.
-    fn set_vring_err(&mut self, queue_index: usize, fd: &EventFd) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        if queue_index as u64 >= node.max_queue_num {
-            return error_code(VhostUserError::InvalidParam);
-        }
-        node.send_fd_for_vring(MasterReq::SET_VRING_ERR, queue_index, fd.as_raw_fd())?;
-        Ok(())
-    }
-}
-
-impl VhostUserMaster for Master {
-    fn get_protocol_features(&mut self) -> Result<VhostUserProtocolFeatures> {
-        let mut node = self.node.lock().unwrap();
-        let flag = VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
-        if node.virtio_features & flag == 0 || node.acked_virtio_features & flag == 0 {
-            return error_code(VhostUserError::InvalidOperation);
-        }
-        let hdr = node.send_request_header(MasterReq::GET_PROTOCOL_FEATURES, None)?;
-        let val = node.recv_reply::<VhostUserU64>(&hdr)?;
-        node.protocol_features = val.value;
-        // Should we support forward compatibility?
-        // If so just mask out unrecognized flags instead of return errors.
-        match VhostUserProtocolFeatures::from_bits(node.protocol_features) {
-            Some(val) => Ok(val),
-            None => error_code(VhostUserError::InvalidMessage),
-        }
-    }
-
-    fn set_protocol_features(&mut self, features: VhostUserProtocolFeatures) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        let flag = VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
-        if node.virtio_features & flag == 0 || node.acked_virtio_features & flag == 0 {
-            return error_code(VhostUserError::InvalidOperation);
-        }
-        let val = VhostUserU64::new(features.bits());
-        let _ = node.send_request_with_body(MasterReq::SET_PROTOCOL_FEATURES, &val, None)?;
-        // Don't wait for ACK here because the protocol feature negotiation process hasn't been
-        // completed yet.
-        node.acked_protocol_features = features.bits();
-        node.protocol_features_ready = true;
-        Ok(())
-    }
-
-    fn get_queue_num(&mut self) -> Result<u64> {
-        let mut node = self.node.lock().unwrap();
-        if !node.is_feature_mq_available() {
-            return error_code(VhostUserError::InvalidOperation);
-        }
-
-        let hdr = node.send_request_header(MasterReq::GET_QUEUE_NUM, None)?;
-        let val = node.recv_reply::<VhostUserU64>(&hdr)?;
-        if val.value > VHOST_USER_MAX_VRINGS {
-            return error_code(VhostUserError::InvalidMessage);
-        }
-        node.max_queue_num = val.value;
-        Ok(node.max_queue_num)
-    }
-
-    fn set_vring_enable(&mut self, queue_index: usize, enable: bool) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        // set_vring_enable() is supported only when PROTOCOL_FEATURES has been enabled.
-        if node.acked_virtio_features & VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits() == 0 {
-            return error_code(VhostUserError::InvalidOperation);
-        } else if queue_index as u64 >= node.max_queue_num {
-            return error_code(VhostUserError::InvalidParam);
-        }
-
-        let flag = if enable { 1 } else { 0 };
-        let val = VhostUserVringState::new(queue_index as u32, flag);
-        let hdr = node.send_request_with_body(MasterReq::SET_VRING_ENABLE, &val, None)?;
-        node.wait_for_ack(&hdr).map_err(|e| e.into())
-    }
-
-    fn get_config(
-        &mut self,
-        offset: u32,
-        size: u32,
-        flags: VhostUserConfigFlags,
-        buf: &[u8],
-    ) -> Result<(VhostUserConfig, VhostUserConfigPayload)> {
-        let body = VhostUserConfig::new(offset, size, flags);
-        if !body.is_valid() {
-            return error_code(VhostUserError::InvalidParam);
-        }
-
-        let mut node = self.node.lock().unwrap();
-        // depends on VhostUserProtocolFeatures::CONFIG
-        if node.acked_protocol_features & VhostUserProtocolFeatures::CONFIG.bits() == 0 {
-            return error_code(VhostUserError::InvalidOperation);
-        }
-
-        // vhost-user spec states that:
-        // "Master payload: virtio device config space"
-        // "Slave payload: virtio device config space"
-        let hdr = node.send_request_with_payload(MasterReq::GET_CONFIG, &body, buf, None)?;
-        let (body_reply, buf_reply, rfds) =
-            node.recv_reply_with_payload::<VhostUserConfig>(&hdr)?;
-        if rfds.is_some() {
-            Endpoint::<MasterReq>::close_rfds(rfds);
-            return error_code(VhostUserError::InvalidMessage);
-        } else if body_reply.size == 0 {
-            return error_code(VhostUserError::SlaveInternalError);
-        } else if body_reply.size != body.size || body_reply.size as usize != buf.len() {
-            return error_code(VhostUserError::InvalidMessage);
-        }
-        Ok((body_reply, buf_reply))
-    }
-
-    fn set_config(&mut self, offset: u32, flags: VhostUserConfigFlags, buf: &[u8]) -> Result<()> {
-        if buf.len() > MAX_MSG_SIZE {
-            return error_code(VhostUserError::InvalidParam);
-        }
-        let body = VhostUserConfig::new(offset, buf.len() as u32, flags);
-        if !body.is_valid() {
-            return error_code(VhostUserError::InvalidParam);
-        }
-
-        let mut node = self.node.lock().unwrap();
-        // depends on VhostUserProtocolFeatures::CONFIG
-        if node.acked_protocol_features & VhostUserProtocolFeatures::CONFIG.bits() == 0 {
-            return error_code(VhostUserError::InvalidOperation);
-        }
-
-        let hdr = node.send_request_with_payload(MasterReq::SET_CONFIG, &body, buf, None)?;
-        node.wait_for_ack(&hdr).map_err(|e| e.into())
-    }
-
-    fn set_slave_request_fd(&mut self, fd: RawFd) -> Result<()> {
-        let mut node = self.node.lock().unwrap();
-        if node.acked_protocol_features & VhostUserProtocolFeatures::SLAVE_REQ.bits() == 0 {
-            return error_code(VhostUserError::InvalidOperation);
-        }
-
-        let fds = [fd];
-        node.send_request_header(MasterReq::SET_SLAVE_REQ_FD, Some(&fds))?;
-        Ok(())
-    }
-}
-
-impl AsRawFd for Master {
-    fn as_raw_fd(&self) -> RawFd {
-        let node = self.node.lock().unwrap();
-        node.main_sock.as_raw_fd()
-    }
-}
-
-/// Context object to pass guest memory configuration to VhostUserMaster::set_mem_table().
-struct VhostUserMemoryContext {
-    regions: VhostUserMemoryPayload,
-    fds: Vec<RawFd>,
-}
-
-impl VhostUserMemoryContext {
-    /// Create a context object.
-    pub fn new() -> Self {
-        VhostUserMemoryContext {
-            regions: VhostUserMemoryPayload::new(),
-            fds: Vec::new(),
-        }
-    }
-
-    /// Append a user memory region and corresponding RawFd into the context object.
-    pub fn append(&mut self, region: &VhostUserMemoryRegion, fd: RawFd) {
-        self.regions.push(*region);
-        self.fds.push(fd);
-    }
-}
-
-struct MasterInternal {
-    // Used to send requests to the slave.
-    main_sock: Endpoint<MasterReq>,
-    // Cached virtio features from the slave.
-    virtio_features: u64,
-    // Cached acked virtio features from the driver.
-    acked_virtio_features: u64,
-    // Cached vhost-user protocol features from the slave.
-    protocol_features: u64,
-    // Cached vhost-user protocol features.
-    acked_protocol_features: u64,
-    // Cached vhost-user protocol features are ready to use.
-    protocol_features_ready: bool,
-    // Cached maxinum number of queues supported from the slave.
-    max_queue_num: u64,
-    // Internal flag to mark failure state.
-    error: Option<i32>,
-}
-
-impl MasterInternal {
-    fn send_request_header(
-        &mut self,
-        code: MasterReq,
-        fds: Option<&[RawFd]>,
-    ) -> VhostUserResult<VhostUserMsgHeader<MasterReq>> {
-        self.check_state()?;
-        let hdr = Self::new_request_header(code, 0);
-        self.main_sock.send_header(&hdr, fds)?;
-        Ok(hdr)
-    }
-
-    fn send_request_with_body<T: Sized>(
-        &mut self,
-        code: MasterReq,
-        msg: &T,
-        fds: Option<&[RawFd]>,
-    ) -> VhostUserResult<VhostUserMsgHeader<MasterReq>> {
-        if mem::size_of::<T>() > MAX_MSG_SIZE {
-            return Err(VhostUserError::InvalidParam);
-        }
-        self.check_state()?;
-
-        let hdr = Self::new_request_header(code, mem::size_of::<T>() as u32);
-        self.main_sock.send_message(&hdr, msg, fds)?;
-        Ok(hdr)
-    }
-
-    fn send_request_with_payload<T: Sized, P: Sized>(
-        &mut self,
-        code: MasterReq,
-        msg: &T,
-        payload: &[P],
-        fds: Option<&[RawFd]>,
-    ) -> VhostUserResult<VhostUserMsgHeader<MasterReq>> {
-        let len = mem::size_of::<T>() + payload.len() * mem::size_of::<P>();
-        if len > MAX_MSG_SIZE {
-            return Err(VhostUserError::InvalidParam);
-        }
-        if let Some(ref fd_arr) = fds {
-            if fd_arr.len() > MAX_ATTACHED_FD_ENTRIES {
-                return Err(VhostUserError::InvalidParam);
-            }
-        }
-        self.check_state()?;
-
-        let hdr = Self::new_request_header(code, len as u32);
-        self.main_sock
-            .send_message_with_payload(&hdr, msg, payload, fds)?;
-        Ok(hdr)
-    }
-
-    fn send_fd_for_vring(
-        &mut self,
-        code: MasterReq,
-        queue_index: usize,
-        fd: RawFd,
-    ) -> VhostUserResult<VhostUserMsgHeader<MasterReq>> {
-        if queue_index as u64 >= self.max_queue_num {
-            return Err(VhostUserError::InvalidParam);
-        }
-        self.check_state()?;
-
-        // Bits (0-7) of the payload contain the vring index. Bit 8 is the invalid FD flag.
-        // This flag is set when there is no file descriptor in the ancillary data. This signals
-        // that polling will be used instead of waiting for the call.
-        let msg = VhostUserU64::new(queue_index as u64);
-        let hdr = Self::new_request_header(code, mem::size_of::<VhostUserU64>() as u32);
-        self.main_sock.send_message(&hdr, &msg, Some(&[fd]))?;
-        Ok(hdr)
-    }
-
-    fn recv_reply<T: Sized + Default + VhostUserMsgValidator>(
-        &mut self,
-        hdr: &VhostUserMsgHeader<MasterReq>,
-    ) -> VhostUserResult<T> {
-        if mem::size_of::<T>() > MAX_MSG_SIZE || hdr.is_reply() {
-            return Err(VhostUserError::InvalidParam);
-        }
-        self.check_state()?;
-
-        let (reply, body, rfds) = self.main_sock.recv_body::<T>()?;
-        if !reply.is_reply_for(&hdr) || rfds.is_some() || !body.is_valid() {
-            Endpoint::<MasterReq>::close_rfds(rfds);
-            return Err(VhostUserError::InvalidMessage);
-        }
-        Ok(body)
-    }
-
-    fn recv_reply_with_payload<T: Sized + Default + VhostUserMsgValidator>(
-        &mut self,
-        hdr: &VhostUserMsgHeader<MasterReq>,
-    ) -> VhostUserResult<(T, Vec<u8>, Option<Vec<RawFd>>)> {
-        if mem::size_of::<T>() > MAX_MSG_SIZE || hdr.is_reply() {
-            return Err(VhostUserError::InvalidParam);
-        }
-        self.check_state()?;
-
-        let mut buf: Vec<u8> = vec![0; hdr.get_size() as usize - mem::size_of::<T>()];
-        let (reply, body, bytes, rfds) = self.main_sock.recv_payload_into_buf::<T>(&mut buf)?;
-        if !reply.is_reply_for(hdr)
-            || reply.get_size() as usize != mem::size_of::<T>() + bytes
-            || rfds.is_some()
-            || !body.is_valid()
-        {
-            Endpoint::<MasterReq>::close_rfds(rfds);
-            return Err(VhostUserError::InvalidMessage);
-        } else if bytes > MAX_MSG_SIZE - mem::size_of::<T>() {
-            return Err(VhostUserError::InvalidMessage);
-        } else if bytes < buf.len() {
-            // It's safe because we have checked the buffer size
-            unsafe { buf.set_len(bytes) };
-        }
-        Ok((body, buf, rfds))
-    }
-
-    fn wait_for_ack(&mut self, hdr: &VhostUserMsgHeader<MasterReq>) -> VhostUserResult<()> {
-        if self.acked_protocol_features & VhostUserProtocolFeatures::REPLY_ACK.bits() == 0
-            || !hdr.is_need_reply()
-        {
-            return Ok(());
-        }
-        self.check_state()?;
-
-        let (reply, body, rfds) = self.main_sock.recv_body::<VhostUserU64>()?;
-        if !reply.is_reply_for(&hdr) || rfds.is_some() || !body.is_valid() {
-            Endpoint::<MasterReq>::close_rfds(rfds);
-            return Err(VhostUserError::InvalidMessage);
-        }
-        if body.value != 0 {
-            return Err(VhostUserError::SlaveInternalError);
-        }
-        Ok(())
-    }
-
-    fn is_feature_mq_available(&self) -> bool {
-        self.acked_protocol_features & VhostUserProtocolFeatures::MQ.bits() != 0
-    }
-
-    fn check_state(&self) -> VhostUserResult<()> {
-        match self.error {
-            Some(e) => Err(VhostUserError::SocketBroken(
-                std::io::Error::from_raw_os_error(e),
-            )),
-            None => Ok(()),
-        }
-    }
-
-    #[inline]
-    fn new_request_header(request: MasterReq, size: u32) -> VhostUserMsgHeader<MasterReq> {
-        // TODO: handle NEED_REPLY flag
-        VhostUserMsgHeader::new(request, 0x1, size)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::super::connection::Listener;
-    use super::*;
-
-    const UNIX_SOCKET_MASTER: &'static str = "/tmp/vhost_user_test_rust_master";
-    const UNIX_SOCKET_MASTER2: &'static str = "/tmp/vhost_user_test_rust_master2";
-    const UNIX_SOCKET_MASTER3: &'static str = "/tmp/vhost_user_test_rust_master3";
-    const UNIX_SOCKET_MASTER4: &'static str = "/tmp/vhost_user_test_rust_master4";
-
-    fn create_pair(path: &str) -> (Master, Endpoint<MasterReq>) {
-        let listener = Listener::new(path, true).unwrap();
-        listener.set_nonblocking(true).unwrap();
-        let master = Master::connect(path, 2).unwrap();
-        let slave = listener.accept().unwrap().unwrap();
-        (master, Endpoint::from_stream(slave))
-    }
-
-    #[test]
-    fn create_master() {
-        let listener = Listener::new(UNIX_SOCKET_MASTER, true).unwrap();
-        listener.set_nonblocking(true).unwrap();
-
-        let mut master = Master::connect(UNIX_SOCKET_MASTER, 2).unwrap();
-        let mut slave = Endpoint::<MasterReq>::from_stream(listener.accept().unwrap().unwrap());
-
-        // Send two messages continuously
-        master.set_owner().unwrap();
-        master.reset_owner().unwrap();
-
-        let (hdr, rfds) = slave.recv_header().unwrap();
-        assert_eq!(hdr.get_code(), MasterReq::SET_OWNER);
-        assert_eq!(hdr.get_size(), 0);
-        assert_eq!(hdr.get_version(), 0x1);
-        assert!(rfds.is_none());
-
-        let (hdr, rfds) = slave.recv_header().unwrap();
-        assert_eq!(hdr.get_code(), MasterReq::RESET_OWNER);
-        assert_eq!(hdr.get_size(), 0);
-        assert_eq!(hdr.get_version(), 0x1);
-        assert!(rfds.is_none());
-    }
-
-    #[test]
-    fn test_create_failure() {
-        let _ = Listener::new(UNIX_SOCKET_MASTER2, true).unwrap();
-        let _ = Listener::new(UNIX_SOCKET_MASTER2, false).is_err();
-        assert!(Master::connect(UNIX_SOCKET_MASTER2, 2).is_err());
-
-        let listener = Listener::new(UNIX_SOCKET_MASTER2, true).unwrap();
-        assert!(Listener::new(UNIX_SOCKET_MASTER2, false).is_err());
-        listener.set_nonblocking(true).unwrap();
-
-        let _master = Master::connect(UNIX_SOCKET_MASTER2, 2).unwrap();
-        let _slave = listener.accept().unwrap().unwrap();
-    }
-
-    #[test]
-    fn test_features() {
-        let (mut master, mut peer) = create_pair(UNIX_SOCKET_MASTER3);
-
-        master.set_owner().unwrap();
-        let (hdr, rfds) = peer.recv_header().unwrap();
-        assert_eq!(hdr.get_code(), MasterReq::SET_OWNER);
-        assert_eq!(hdr.get_size(), 0);
-        assert_eq!(hdr.get_version(), 0x1);
-        assert!(rfds.is_none());
-
-        let hdr = VhostUserMsgHeader::new(MasterReq::GET_FEATURES, 0x4, 8);
-        let msg = VhostUserU64::new(0x15);
-        peer.send_message(&hdr, &msg, None).unwrap();
-        let features = master.get_features().unwrap();
-        assert_eq!(features, 0x15u64);
-        let (_hdr, rfds) = peer.recv_header().unwrap();
-        assert!(rfds.is_none());
-
-        master.set_features(0x15).unwrap();
-        let (_hdr, msg, rfds) = peer.recv_body::<VhostUserU64>().unwrap();
-        assert!(rfds.is_none());
-        let val = msg.value;
-        assert_eq!(val, 0x15);
-
-        let hdr = VhostUserMsgHeader::new(MasterReq::GET_FEATURES, 0x4, 8);
-        let msg = 0x15u32;
-        peer.send_message(&hdr, &msg, None).unwrap();
-        assert!(master.get_features().is_err());
-    }
-
-    #[test]
-    fn test_protocol_features() {
-        let (mut master, mut peer) = create_pair(UNIX_SOCKET_MASTER4);
-
-        master.set_owner().unwrap();
-        let (hdr, rfds) = peer.recv_header().unwrap();
-        assert_eq!(hdr.get_code(), MasterReq::SET_OWNER);
-        assert!(rfds.is_none());
-
-        assert!(master.get_protocol_features().is_err());
-        assert!(master
-            .set_protocol_features(VhostUserProtocolFeatures::all())
-            .is_err());
-
-        let vfeatures = 0x15 | VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
-        let hdr = VhostUserMsgHeader::new(MasterReq::GET_FEATURES, 0x4, 8);
-        let msg = VhostUserU64::new(vfeatures);
-        peer.send_message(&hdr, &msg, None).unwrap();
-        let features = master.get_features().unwrap();
-        assert_eq!(features, vfeatures);
-        let (_hdr, rfds) = peer.recv_header().unwrap();
-        assert!(rfds.is_none());
-
-        master.set_features(vfeatures).unwrap();
-        let (_hdr, msg, rfds) = peer.recv_body::<VhostUserU64>().unwrap();
-        assert!(rfds.is_none());
-        let val = msg.value;
-        assert_eq!(val, vfeatures);
-
-        let pfeatures = VhostUserProtocolFeatures::all();
-        let hdr = VhostUserMsgHeader::new(MasterReq::GET_PROTOCOL_FEATURES, 0x4, 8);
-        let msg = VhostUserU64::new(pfeatures.bits());
-        peer.send_message(&hdr, &msg, None).unwrap();
-        let features = master.get_protocol_features().unwrap();
-        assert_eq!(features, pfeatures);
-        let (_hdr, rfds) = peer.recv_header().unwrap();
-        assert!(rfds.is_none());
-
-        master.set_protocol_features(pfeatures).unwrap();
-        let (_hdr, msg, rfds) = peer.recv_body::<VhostUserU64>().unwrap();
-        assert!(rfds.is_none());
-        let val = msg.value;
-        assert_eq!(val, pfeatures.bits());
-
-        let hdr = VhostUserMsgHeader::new(MasterReq::SET_PROTOCOL_FEATURES, 0x4, 8);
-        let msg = VhostUserU64::new(pfeatures.bits());
-        peer.send_message(&hdr, &msg, None).unwrap();
-        assert!(master.get_protocol_features().is_err());
-    }
-
-    #[test]
-    fn test_set_mem_table() {
-        // TODO
-    }
-
-    #[test]
-    fn test_get_ring_num() {
-        // TODO
-    }
-}

vhost_rs/src/vhost_user/master_req_handler.rs

@@ -1,258 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-//! Traits and Structs to handle vhost-user requests from the slave to the master.
-
-use libc;
-use std::mem;
-use std::os::unix::io::{AsRawFd, RawFd};
-use std::os::unix::net::UnixStream;
-use std::sync::{Arc, Mutex};
-
-use super::connection::Endpoint;
-use super::message::*;
-use super::{Error, HandlerResult, Result};
-
-/// Trait to handle vhost-user requests from the slave to the master.
-pub trait VhostUserMasterReqHandler {
-    // fn handle_iotlb_msg(&mut self, iotlb: VhostUserIotlb);
-    // fn handle_vring_host_notifier(&mut self, area: VhostUserVringArea, fd: RawFd);
-
-    /// Handle device configuration change notifications from the slave.
-    fn handle_config_change(&mut self) -> HandlerResult<()> {
-        Err(std::io::Error::from_raw_os_error(libc::ENOSYS))
-    }
-
-    /// Handle virtio-fs map file requests from the slave.
-    fn fs_slave_map(&mut self, _fs: &VhostUserFSSlaveMsg, fd: RawFd) -> HandlerResult<()> {
-        // Safe because we have just received the rawfd from kernel.
-        unsafe { libc::close(fd) };
-        Err(std::io::Error::from_raw_os_error(libc::ENOSYS))
-    }
-
-    /// Handle virtio-fs unmap file requests from the slave.
-    fn fs_slave_unmap(&mut self, _fs: &VhostUserFSSlaveMsg) -> HandlerResult<()> {
-        Err(std::io::Error::from_raw_os_error(libc::ENOSYS))
-    }
-
-    /// Handle virtio-fs sync file requests from the slave.
-    fn fs_slave_sync(&mut self, _fs: &VhostUserFSSlaveMsg) -> HandlerResult<()> {
-        Err(std::io::Error::from_raw_os_error(libc::ENOSYS))
-    }
-}
-
-/// A vhost-user master request endpoint which relays all received requests from the slave to the
-/// provided request handler.
-pub struct MasterReqHandler<S: VhostUserMasterReqHandler> {
-    // underlying Unix domain socket for communication
-    sub_sock: Endpoint<SlaveReq>,
-    tx_sock: UnixStream,
-    // the VirtIO backend device object
-    backend: Arc<Mutex<S>>,
-    // whether the endpoint has encountered any failure
-    error: Option<i32>,
-}
-
-impl<S: VhostUserMasterReqHandler> MasterReqHandler<S> {
-    /// Create a vhost-user slave request handler.
-    /// This opens a pair of connected anonymous sockets.
-    /// Returns Self and the socket that must be sent to the slave via SET_SLAVE_REQ_FD.
-    pub fn new(backend: Arc<Mutex<S>>) -> Result<Self> {
-        let (tx, rx) = UnixStream::pair().map_err(Error::SocketError)?;
-
-        Ok(MasterReqHandler {
-            sub_sock: Endpoint::<SlaveReq>::from_stream(rx),
-            tx_sock: tx,
-            backend,
-            error: None,
-        })
-    }
-
-    /// Get the raw fd to send to the slave as slave communication channel.
-    pub fn get_tx_raw_fd(&self) -> RawFd {
-        self.tx_sock.as_raw_fd()
-    }
-
-    /// Mark endpoint as failed or normal state.
-    pub fn set_failed(&mut self, error: i32) {
-        self.error = Some(error);
-    }
-
-    /// Receive and handle one incoming request message from the slave.
-    /// The caller needs to:
-    /// . serialize calls to this function
-    /// . decide what to do when errer happens
-    /// . optional recover from failure
-    pub fn handle_request(&mut self) -> Result<()> {
-        // Return error if the endpoint is already in failed state.
-        self.check_state()?;
-
-        // The underlying communication channel is a Unix domain socket in
-        // stream mode, and recvmsg() is a little tricky here. To successfully
-        // receive attached file descriptors, we need to receive messages and
-        // corresponding attached file descriptors in this way:
-        // . recv messsage header and optional attached file
-        // . validate message header
-        // . recv optional message body and payload according size field in
-        //   message header
-        // . validate message body and optional payload
-        let (hdr, rfds) = self.sub_sock.recv_header()?;
-        let rfds = self.check_attached_rfds(&hdr, rfds)?;
-        let (size, buf) = match hdr.get_size() {
-            0 => (0, vec![0u8; 0]),
-            len => {
-                let (size2, rbuf) = self.sub_sock.recv_data(len as usize)?;
-                if size2 != len as usize {
-                    return Err(Error::InvalidMessage);
-                }
-                (size2, rbuf)
-            }
-        };
-
-        let res = match hdr.get_code() {
-            SlaveReq::CONFIG_CHANGE_MSG => {
-                self.check_msg_size(&hdr, size, 0)?;
-                self.backend
-                    .lock()
-                    .unwrap()
-                    .handle_config_change()
-                    .map_err(Error::ReqHandlerError)
-            }
-            SlaveReq::FS_MAP => {
-                let msg = self.extract_msg_body::<VhostUserFSSlaveMsg>(&hdr, size, &buf)?;
-                self.backend
-                    .lock()
-                    .unwrap()
-                    .fs_slave_map(msg, rfds.unwrap()[0])
-                    .map_err(Error::ReqHandlerError)
-            }
-            SlaveReq::FS_UNMAP => {
-                let msg = self.extract_msg_body::<VhostUserFSSlaveMsg>(&hdr, size, &buf)?;
-                self.backend
-                    .lock()
-                    .unwrap()
-                    .fs_slave_unmap(msg)
-                    .map_err(Error::ReqHandlerError)
-            }
-            SlaveReq::FS_SYNC => {
-                let msg = self.extract_msg_body::<VhostUserFSSlaveMsg>(&hdr, size, &buf)?;
-                self.backend
-                    .lock()
-                    .unwrap()
-                    .fs_slave_sync(msg)
-                    .map_err(Error::ReqHandlerError)
-            }
-            _ => Err(Error::InvalidMessage),
-        };
-
-        self.send_ack_message(&hdr, &res)?;
-
-        res
-    }
-
-    fn check_state(&self) -> Result<()> {
-        match self.error {
-            Some(e) => Err(Error::SocketBroken(std::io::Error::from_raw_os_error(e))),
-            None => Ok(()),
-        }
-    }
-
-    fn check_msg_size(
-        &self,
-        hdr: &VhostUserMsgHeader<SlaveReq>,
-        size: usize,
-        expected: usize,
-    ) -> Result<()> {
-        if hdr.get_size() as usize != expected
-            || hdr.is_reply()
-            || hdr.get_version() != 0x1
-            || size != expected
-        {
-            return Err(Error::InvalidMessage);
-        }
-        Ok(())
-    }
-
-    fn check_attached_rfds(
-        &self,
-        hdr: &VhostUserMsgHeader<SlaveReq>,
-        rfds: Option<Vec<RawFd>>,
-    ) -> Result<Option<Vec<RawFd>>> {
-        match hdr.get_code() {
-            SlaveReq::FS_MAP => {
-                // Expect an fd set with a single fd.
-                match rfds {
-                    None => Err(Error::InvalidMessage),
-                    Some(fds) => {
-                        if fds.len() != 1 {
-                            Endpoint::<SlaveReq>::close_rfds(Some(fds));
-                            Err(Error::InvalidMessage)
-                        } else {
-                            Ok(Some(fds))
-                        }
-                    }
-                }
-            }
-            _ => {
-                if rfds.is_some() {
-                    Endpoint::<SlaveReq>::close_rfds(rfds);
-                    Err(Error::InvalidMessage)
-                } else {
-                    Ok(rfds)
-                }
-            }
-        }
-    }
-
-    fn extract_msg_body<'a, T: Sized + VhostUserMsgValidator>(
-        &self,
-        hdr: &VhostUserMsgHeader<SlaveReq>,
-        size: usize,
-        buf: &'a [u8],
-    ) -> Result<&'a T> {
-        self.check_msg_size(hdr, size, mem::size_of::<T>())?;
-        let msg = unsafe { &*(buf.as_ptr() as *const T) };
-        if !msg.is_valid() {
-            return Err(Error::InvalidMessage);
-        }
-        Ok(msg)
-    }
-
-    fn new_reply_header<T: Sized>(
-        &self,
-        req: &VhostUserMsgHeader<SlaveReq>,
-    ) -> Result<VhostUserMsgHeader<SlaveReq>> {
-        if mem::size_of::<T>() > MAX_MSG_SIZE {
-            return Err(Error::InvalidParam);
-        }
-        self.check_state()?;
-        Ok(VhostUserMsgHeader::new(
-            req.get_code(),
-            VhostUserHeaderFlag::REPLY.bits(),
-            mem::size_of::<T>() as u32,
-        ))
-    }
-
-    fn send_ack_message(
-        &mut self,
-        req: &VhostUserMsgHeader<SlaveReq>,
-        res: &Result<()>,
-    ) -> Result<()> {
-        if req.is_need_reply() {
-            let hdr = self.new_reply_header::<VhostUserU64>(req)?;
-            let val = match res {
-                Ok(_) => 0,
-                Err(_) => 1,
-            };
-            let msg = VhostUserU64::new(val);
-            self.sub_sock.send_message(&hdr, &msg, None)?;
-        }
-        Ok(())
-    }
-}
-
-impl<S: VhostUserMasterReqHandler> AsRawFd for MasterReqHandler<S> {
-    fn as_raw_fd(&self) -> RawFd {
-        self.sub_sock.as_raw_fd()
-    }
-}

vhost_rs/src/vhost_user/message.rs

@@ -1,811 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-//! Define communication messages for the vhost-user protocol.
-//!
-//! For message definition, please refer to the [vhost-user spec](https://github.com/qemu/qemu/blob/f7526eece29cd2e36a63b6703508b24453095eb8/docs/interop/vhost-user.txt).
-
-#![allow(dead_code)]
-#![allow(non_camel_case_types)]
-
-use std::fmt::Debug;
-use std::marker::PhantomData;
-
-use VringConfigData;
-
-/// The vhost-user specification uses a field of u32 to store message length.
-/// On the other hand, preallocated buffers are needed to receive messages from the Unix domain
-/// socket. To preallocating a 4GB buffer for each vhost-user message is really just an overhead.
-/// Among all defined vhost-user messages, only the VhostUserConfig and VhostUserMemory has variable
-/// message size. For the VhostUserConfig, a maximum size of 4K is enough because the user
-/// configuration space for virtio devices is (4K - 0x100) bytes at most. For the VhostUserMemory,
-/// 4K should be enough too because it can support 255 memory regions at most.
-pub const MAX_MSG_SIZE: usize = 0x1000;
-
-/// The VhostUserMemory message has variable message size and variable number of attached file
-/// descriptors. Each user memory region entry in the message payload occupies 32 bytes,
-/// so setting maximum number of attached file descriptors based on the maximum message size.
-/// But rust only implements Default and AsMut traits for arrays with 0 - 32 entries, so further
-/// reduce the maximum number...
-// pub const MAX_ATTACHED_FD_ENTRIES: usize = (MAX_MSG_SIZE - 8) / 32;
-pub const MAX_ATTACHED_FD_ENTRIES: usize = 32;
-
-/// Starting position (inclusion) of the device configuration space in virtio devices.
-pub const VHOST_USER_CONFIG_OFFSET: u32 = 0x100;
-
-/// Ending position (exclusion) of the device configuration space in virtio devices.
-pub const VHOST_USER_CONFIG_SIZE: u32 = 0x1000;
-
-/// Maximum number of vrings supported.
-pub const VHOST_USER_MAX_VRINGS: u64 = 0xFFu64;
-
-pub(super) trait Req:
-    Clone + Copy + Debug + PartialEq + Eq + PartialOrd + Ord + Into<u32>
-{
-    fn is_valid(&self) -> bool;
-}
-
-/// Type of requests sending from masters to slaves.
-#[repr(u32)]
-#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
-pub enum MasterReq {
-    /// Null operation.
-    NOOP = 0,
-    /// Get from the underlying vhost implementation the features bit mask.
-    GET_FEATURES = 1,
-    /// Enable features in the underlying vhost implementation using a bit mask.
-    SET_FEATURES = 2,
-    /// Set the current Master as an owner of the session.
-    SET_OWNER = 3,
-    /// No longer used.
-    RESET_OWNER = 4,
-    /// Set the memory map regions on the slave so it can translate the vring addresses.
-    SET_MEM_TABLE = 5,
-    /// Set logging shared memory space.
-    SET_LOG_BASE = 6,
-    /// Set the logging file descriptor, which is passed as ancillary data.
-    SET_LOG_FD = 7,
-    /// Set the size of the queue.
-    SET_VRING_NUM = 8,
-    /// Set the addresses of the different aspects of the vring.
-    SET_VRING_ADDR = 9,
-    /// Set the base offset in the available vring.
-    SET_VRING_BASE = 10,
-    /// Get the available vring base offset.
-    GET_VRING_BASE = 11,
-    /// Set the event file descriptor for adding buffers to the vring.
-    SET_VRING_KICK = 12,
-    /// Set the event file descriptor to signal when buffers are used.
-    SET_VRING_CALL = 13,
-    /// Set the event file descriptor to signal when error occurs.
-    SET_VRING_ERR = 14,
-    /// Get the protocol feature bit mask from the underlying vhost implementation.
-    GET_PROTOCOL_FEATURES = 15,
-    /// Enable protocol features in the underlying vhost implementation.
-    SET_PROTOCOL_FEATURES = 16,
-    /// Query how many queues the backend supports.
-    GET_QUEUE_NUM = 17,
-    /// Signal slave to enable or disable corresponding vring.
-    SET_VRING_ENABLE = 18,
-    /// Ask vhost user backend to broadcast a fake RARP to notify the migration is terminated
-    /// for guest that does not support GUEST_ANNOUNCE.
-    SEND_RARP = 19,
-    /// Set host MTU value exposed to the guest.
-    NET_SET_MTU = 20,
-    /// Set the socket file descriptor for slave initiated requests.
-    SET_SLAVE_REQ_FD = 21,
-    /// Send IOTLB messages with struct vhost_iotlb_msg as payload.
-    IOTLB_MSG = 22,
-    /// Set the endianness of a VQ for legacy devices.
-    SET_VRING_ENDIAN = 23,
-    /// Fetch the contents of the virtio device configuration space.
-    GET_CONFIG = 24,
-    /// Change the contents of the virtio device configuration space.
-    SET_CONFIG = 25,
-    /// Create a session for crypto operation.
-    CREATE_CRYPTO_SESSION = 26,
-    /// Close a session for crypto operation.
-    CLOSE_CRYPTO_SESSION = 27,
-    /// Advise slave that a migration with postcopy enabled is underway.
-    POSTCOPY_ADVISE = 28,
-    /// Advise slave that a transition to postcopy mode has happened.
-    POSTCOPY_LISTEN = 29,
-    /// Advise that postcopy migration has now completed.
-    POSTCOPY_END = 30,
-    /// Get a shared buffer from slave.
-    GET_INFLIGHT_FD = 31,
-    /// Send the shared inflight buffer back to slave
-    SET_INFLIGHT_FD = 32,
-    /// Upper bound of valid commands.
-    MAX_CMD = 33,
-}
-
-impl Into<u32> for MasterReq {
-    fn into(self) -> u32 {
-        self as u32
-    }
-}
-
-impl Req for MasterReq {
-    fn is_valid(&self) -> bool {
-        (*self > MasterReq::NOOP) && (*self < MasterReq::MAX_CMD)
-    }
-}
-
-/// Type of requests sending from slaves to masters.
-#[repr(u32)]
-#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
-pub enum SlaveReq {
-    /// Null operation.
-    NOOP = 0,
-    /// Send IOTLB messages with struct vhost_iotlb_msg as payload.
-    IOTLB_MSG = 1,
-    /// Notify that the virtio device's configuration space has changed.
-    CONFIG_CHANGE_MSG = 2,
-    /// Set host notifier for a specified queue.
-    VRING_HOST_NOTIFIER_MSG = 3,
-    /// Virtio-fs draft: map file content into the window.
-    FS_MAP = 4,
-    /// Virtio-fs draft: unmap file content from the window.
-    FS_UNMAP = 5,
-    /// Virtio-fs draft: sync file content.
-    FS_SYNC = 6,
-    /// Upper bound of valid commands.
-    MAX_CMD = 7,
-}
-
-impl Into<u32> for SlaveReq {
-    fn into(self) -> u32 {
-        self as u32
-    }
-}
-
-impl Req for SlaveReq {
-    fn is_valid(&self) -> bool {
-        (*self > SlaveReq::NOOP) && (*self < SlaveReq::MAX_CMD)
-    }
-}
-
-/// Vhost message Validator.
-pub trait VhostUserMsgValidator {
-    /// Validate message syntax only.
-    /// It doesn't validate message semantics such as protocol version number and dependency
-    /// on feature flags etc.
-    fn is_valid(&self) -> bool {
-        true
-    }
-}
-
-bitflags! {
-    /// Common message flags for vhost-user requests and replies.
-    pub struct VhostUserHeaderFlag: u32 {
-        /// Bits[0..2] is message version number.
-        const VERSION = 0x3;
-        /// Mark message as reply.
-        const REPLY = 0x4;
-        /// Sender anticipates a reply message from the peer.
-        const NEED_REPLY = 0x8;
-        /// All valid bits.
-        const ALL_FLAGS = 0xc;
-        /// All reserved bits.
-        const RESERVED_BITS = !0xf;
-    }
-}
-
-/// Common message header for vhost-user requests and replies.
-/// A vhost-user message consists of 3 header fields and an optional payload. All numbers are in the
-/// machine native byte order.
-#[allow(safe_packed_borrows)]
-#[repr(packed)]
-#[derive(Debug, Clone, Copy, PartialEq)]
-pub(super) struct VhostUserMsgHeader<R: Req> {
-    request: u32,
-    flags: u32,
-    size: u32,
-    _r: PhantomData<R>,
-}
-
-impl<R: Req> VhostUserMsgHeader<R> {
-    /// Create a new instance of `VhostUserMsgHeader`.
-    pub fn new(request: R, flags: u32, size: u32) -> Self {
-        // Default to protocol version 1
-        let fl = (flags & VhostUserHeaderFlag::ALL_FLAGS.bits()) | 0x1;
-        VhostUserMsgHeader {
-            request: request.into(),
-            flags: fl,
-            size,
-            _r: PhantomData,
-        }
-    }
-
-    /// Get message type.
-    pub fn get_code(&self) -> R {
-        // It's safe because R is marked as repr(u32).
-        unsafe { std::mem::transmute_copy::<u32, R>(&self.request) }
-    }
-
-    /// Set message type.
-    pub fn set_code(&mut self, request: R) {
-        self.request = request.into();
-    }
-
-    /// Get message version number.
-    pub fn get_version(&self) -> u32 {
-        self.flags & 0x3
-    }
-
-    /// Set message version number.
-    pub fn set_version(&mut self, ver: u32) {
-        self.flags &= !0x3;
-        self.flags |= ver & 0x3;
-    }
-
-    /// Check whether it's a reply message.
-    pub fn is_reply(&self) -> bool {
-        (self.flags & VhostUserHeaderFlag::REPLY.bits()) != 0
-    }
-
-    /// Mark message as reply.
-    pub fn set_reply(&mut self, is_reply: bool) {
-        if is_reply {
-            self.flags |= VhostUserHeaderFlag::REPLY.bits();
-        } else {
-            self.flags &= !VhostUserHeaderFlag::REPLY.bits();
-        }
-    }
-
-    /// Check whether reply for this message is requested.
-    pub fn is_need_reply(&self) -> bool {
-        (self.flags & VhostUserHeaderFlag::NEED_REPLY.bits()) != 0
-    }
-
-    /// Mark that reply for this message is needed.
-    pub fn set_need_reply(&mut self, need_reply: bool) {
-        if need_reply {
-            self.flags |= VhostUserHeaderFlag::NEED_REPLY.bits();
-        } else {
-            self.flags &= !VhostUserHeaderFlag::NEED_REPLY.bits();
-        }
-    }
-
-    /// Check whether it's the reply message for the request `req`.
-    pub fn is_reply_for(&self, req: &VhostUserMsgHeader<R>) -> bool {
-        self.is_reply() && !req.is_reply() && self.get_code() == req.get_code()
-    }
-
-    /// Get message size.
-    pub fn get_size(&self) -> u32 {
-        self.size
-    }
-
-    /// Set message size.
-    pub fn set_size(&mut self, size: u32) {
-        self.size = size;
-    }
-}
-
-impl<R: Req> Default for VhostUserMsgHeader<R> {
-    fn default() -> Self {
-        VhostUserMsgHeader {
-            request: 0,
-            flags: 0x1,
-            size: 0,
-            _r: PhantomData,
-        }
-    }
-}
-
-impl<T: Req> VhostUserMsgValidator for VhostUserMsgHeader<T> {
-    #[allow(clippy::if_same_then_else)]
-    fn is_valid(&self) -> bool {
-        if !self.get_code().is_valid() {
-            return false;
-        } else if self.size as usize > MAX_MSG_SIZE {
-            return false;
-        } else if self.get_version() != 0x1 {
-            return false;
-        } else if (self.flags & VhostUserHeaderFlag::RESERVED_BITS.bits()) != 0 {
-            return false;
-        }
-        true
-    }
-}
-
-bitflags! {
-    /// Transport specific flags in VirtIO feature set defined by vhost-user.
-    pub struct VhostUserVirtioFeatures: u64 {
-        /// Feature flag for the protocol feature.
-        const PROTOCOL_FEATURES = 0x4000_0000;
-    }
-}
-
-bitflags! {
-    /// Vhost-user protocol feature flags.
-    pub struct VhostUserProtocolFeatures: u64 {
-        /// Support multiple queues.
-        const MQ = 0x0000_0001;
-        /// Support logging through shared memory fd.
-        const LOG_SHMFD = 0x0000_0002;
-        /// Support broadcasting fake RARP packet.
-        const RARP = 0x0000_0004;
-        /// Support sending reply messages for requests with NEED_REPLY flag set.
-        const REPLY_ACK = 0x0000_0008;
-        /// Support setting MTU for virtio-net devices.
-        const MTU = 0x0000_0010;
-        /// Allow the slave to send requests to the master by an optional communication channel.
-        const SLAVE_REQ = 0x0000_0020;
-        /// Support setting slave endian by SET_VRING_ENDIAN.
-        const CROSS_ENDIAN = 0x0000_0040;
-        /// Support crypto operations.
-        const CRYPTO_SESSION = 0x0000_0080;
-        /// Support sending userfault_fd from slaves to masters.
-        const PAGEFAULT = 0x0000_0100;
-        /// Support Virtio device configuration.
-        const CONFIG = 0x0000_0200;
-        /// Allow the slave to send fds (at most 8 descriptors in each message) to the master.
-        const SLAVE_SEND_FD = 0x0000_0400;
-        /// Allow the slave to register a host notifier.
-        const HOST_NOTIFIER = 0x0000_0800;
-        /// Support inflight shmfd.
-        const INFLIGHT_SHMFD = 0x0000_1000;
-    }
-}
-
-/// A generic message to encapsulate a 64-bit value.
-#[repr(packed)]
-#[derive(Default)]
-pub struct VhostUserU64 {
-    /// The encapsulated 64-bit common value.
-    pub value: u64,
-}
-
-impl VhostUserU64 {
-    /// Create a new instance.
-    pub fn new(value: u64) -> Self {
-        VhostUserU64 { value }
-    }
-}
-
-impl VhostUserMsgValidator for VhostUserU64 {}
-
-/// Memory region descriptor for the SET_MEM_TABLE request.
-#[repr(packed)]
-#[derive(Default)]
-pub struct VhostUserMemory {
-    /// Number of memory regions in the payload.
-    pub num_regions: u32,
-    /// Padding for alignment.
-    pub padding1: u32,
-}
-
-impl VhostUserMemory {
-    /// Create a new instance.
-    pub fn new(cnt: u32) -> Self {
-        VhostUserMemory {
-            num_regions: cnt,
-            padding1: 0,
-        }
-    }
-}
-
-impl VhostUserMsgValidator for VhostUserMemory {
-    #[allow(clippy::if_same_then_else)]
-    fn is_valid(&self) -> bool {
-        if self.padding1 != 0 {
-            return false;
-        } else if self.num_regions == 0 || self.num_regions > MAX_ATTACHED_FD_ENTRIES as u32 {
-            return false;
-        }
-        true
-    }
-}
-
-/// Memory region descriptors as payload for the SET_MEM_TABLE request.
-#[repr(packed)]
-#[derive(Default, Clone, Copy)]
-pub struct VhostUserMemoryRegion {
-    /// Guest physical address of the memory region.
-    pub guest_phys_addr: u64,
-    /// Size of the memory region.
-    pub memory_size: u64,
-    /// Virtual address in the current process.
-    pub user_addr: u64,
-    /// Offset where region starts in the mapped memory.
-    pub mmap_offset: u64,
-}
-
-impl VhostUserMemoryRegion {
-    /// Create a new instance.
-    pub fn new(guest_phys_addr: u64, memory_size: u64, user_addr: u64, mmap_offset: u64) -> Self {
-        VhostUserMemoryRegion {
-            guest_phys_addr,
-            memory_size,
-            user_addr,
-            mmap_offset,
-        }
-    }
-}
-
-impl VhostUserMsgValidator for VhostUserMemoryRegion {
-    fn is_valid(&self) -> bool {
-        if self.memory_size == 0
-            || self.guest_phys_addr.checked_add(self.memory_size).is_none()
-            || self.user_addr.checked_add(self.memory_size).is_none()
-            || self.mmap_offset.checked_add(self.memory_size).is_none()
-        {
-            return false;
-        }
-        true
-    }
-}
-
-/// Payload of the VhostUserMemory message.
-pub type VhostUserMemoryPayload = Vec<VhostUserMemoryRegion>;
-
-/// Vring state descriptor.
-#[repr(packed)]
-#[derive(Default)]
-pub struct VhostUserVringState {
-    /// Vring index.
-    pub index: u32,
-    /// A common 32bit value to encapsulate vring state etc.
-    pub num: u32,
-}
-
-impl VhostUserVringState {
-    /// Create a new instance.
-    pub fn new(index: u32, num: u32) -> Self {
-        VhostUserVringState { index, num }
-    }
-}
-
-impl VhostUserMsgValidator for VhostUserVringState {}
-
-bitflags! {
-    /// Flags for vring address.
-    pub struct VhostUserVringAddrFlags: u32 {
-        /// Support log of vring operations.
-        /// Modifications to "used" vring should be logged.
-        const VHOST_VRING_F_LOG = 0x1;
-    }
-}
-
-/// Vring address descriptor.
-#[repr(packed)]
-#[derive(Default)]
-pub struct VhostUserVringAddr {
-    /// Vring index.
-    pub index: u32,
-    /// Vring flags defined by VhostUserVringAddrFlags.
-    pub flags: u32,
-    /// Ring address of the vring descriptor table.
-    pub descriptor: u64,
-    /// Ring address of the vring used ring.
-    pub used: u64,
-    /// Ring address of the vring available ring.
-    pub available: u64,
-    /// Guest address for logging.
-    pub log: u64,
-}
-
-impl VhostUserVringAddr {
-    /// Create a new instance.
-    pub fn new(
-        index: u32,
-        flags: VhostUserVringAddrFlags,
-        descriptor: u64,
-        used: u64,
-        available: u64,
-        log: u64,
-    ) -> Self {
-        VhostUserVringAddr {
-            index,
-            flags: flags.bits(),
-            descriptor,
-            used,
-            available,
-            log,
-        }
-    }
-
-    /// Create a new instance from `VringConfigData`.
-    #[cfg_attr(feature = "cargo-clippy", allow(clippy::identity_conversion))]
-    pub fn from_config_data(index: u32, config_data: &VringConfigData) -> Self {
-        let log_addr = config_data.log_addr.unwrap_or(0);
-        VhostUserVringAddr {
-            index,
-            flags: config_data.flags,
-            descriptor: config_data.desc_table_addr,
-            used: config_data.used_ring_addr,
-            available: config_data.avail_ring_addr,
-            log: log_addr,
-        }
-    }
-}
-
-impl VhostUserMsgValidator for VhostUserVringAddr {
-    #[allow(clippy::if_same_then_else)]
-    fn is_valid(&self) -> bool {
-        if (self.flags & !VhostUserVringAddrFlags::all().bits()) != 0 {
-            return false;
-        } else if self.descriptor & 0xf != 0 {
-            return false;
-        } else if self.available & 0x1 != 0 {
-            return false;
-        } else if self.used & 0x3 != 0 {
-            return false;
-        }
-        true
-    }
-}
-
-bitflags! {
-    /// Flags for the device configuration message.
-    pub struct VhostUserConfigFlags: u32 {
-        /// Vhost master messages used for writeable fields.
-        const WRITABLE = 0x0;
-        /// Vhost master messages used for live migration.
-        const LIVE_MIGRATION = 0x1;
-    }
-}
-
-/// Message to read/write device configuration space.
-#[repr(packed)]
-#[derive(Default)]
-pub struct VhostUserConfig {
-    /// Offset of virtio device's configuration space.
-    pub offset: u32,
-    /// Configuration space access size in bytes.
-    pub size: u32,
-    /// Flags for the device configuration operation.
-    pub flags: u32,
-}
-
-impl VhostUserConfig {
-    /// Create a new instance.
-    pub fn new(offset: u32, size: u32, flags: VhostUserConfigFlags) -> Self {
-        VhostUserConfig {
-            offset,
-            size,
-            flags: flags.bits(),
-        }
-    }
-}
-
-impl VhostUserMsgValidator for VhostUserConfig {
-    #[allow(clippy::if_same_then_else)]
-    fn is_valid(&self) -> bool {
-        if (self.flags & !VhostUserConfigFlags::all().bits()) != 0 {
-            return false;
-        } else if self.offset >= VHOST_USER_CONFIG_SIZE
-            || self.size == 0
-            || self.size > VHOST_USER_CONFIG_SIZE
-            || self.size + self.offset > VHOST_USER_CONFIG_SIZE
-        {
-            return false;
-        }
-        true
-    }
-}
-
-/// Payload for the VhostUserConfig message.
-pub type VhostUserConfigPayload = Vec<u8>;
-
-/*
- * TODO: support dirty log, live migration and IOTLB operations.
-#[repr(packed)]
-pub struct VhostUserVringArea {
-    pub index: u32,
-    pub flags: u32,
-    pub size: u64,
-    pub offset: u64,
-}
-
-#[repr(packed)]
-pub struct VhostUserLog {
-    pub size: u64,
-    pub offset: u64,
-}
-
-#[repr(packed)]
-pub struct VhostUserIotlb {
-    pub iova: u64,
-    pub size: u64,
-    pub user_addr: u64,
-    pub permission: u8,
-    pub optype: u8,
-}
-*/
-
-bitflags! {
-    #[derive(Default)]
-    /// Flags for virtio-fs slave messages.
-    pub struct VhostUserFSSlaveMsgFlags: u64 {
-        /// Empty permission.
-        const EMPTY = 0x0;
-        /// Read permission.
-        const MAP_R = 0x1;
-        /// Write permission.
-        const MAP_W = 0x2;
-    }
-}
-
-/// Max entries in one virtio-fs slave request.
-const VHOST_USER_FS_SLAVE_ENTRIES: usize = 8;
-
-/// Slave request message to update the MMIO window.
-#[repr(packed)]
-#[derive(Default)]
-pub struct VhostUserFSSlaveMsg {
-    /// TODO:
-    pub fd_offset: [u64; VHOST_USER_FS_SLAVE_ENTRIES],
-    /// TODO:
-    pub cache_offset: [u64; VHOST_USER_FS_SLAVE_ENTRIES],
-    /// Size of region to map.
-    pub len: [u64; VHOST_USER_FS_SLAVE_ENTRIES],
-    /// Flags for the mmap operation
-    pub flags: [VhostUserFSSlaveMsgFlags; VHOST_USER_FS_SLAVE_ENTRIES],
-}
-
-impl VhostUserMsgValidator for VhostUserFSSlaveMsg {
-    fn is_valid(&self) -> bool {
-        for i in 0..VHOST_USER_FS_SLAVE_ENTRIES {
-            if ({ self.flags[i] }.bits() & !VhostUserFSSlaveMsgFlags::all().bits()) != 0
-                || self.fd_offset[i].checked_add(self.len[i]).is_none()
-                || self.cache_offset[i].checked_add(self.len[i]).is_none()
-            {
-                return false;
-            }
-        }
-        true
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use std::mem;
-
-    #[test]
-    fn check_request_code() {
-        let code = MasterReq::NOOP;
-        assert!(!code.is_valid());
-        let code = MasterReq::MAX_CMD;
-        assert!(!code.is_valid());
-        let code = MasterReq::GET_FEATURES;
-        assert!(code.is_valid());
-    }
-
-    #[test]
-    fn msg_header_ops() {
-        let mut hdr = VhostUserMsgHeader::new(MasterReq::GET_FEATURES, 0, 0x100);
-        assert_eq!(hdr.get_code(), MasterReq::GET_FEATURES);
-        hdr.set_code(MasterReq::SET_FEATURES);
-        assert_eq!(hdr.get_code(), MasterReq::SET_FEATURES);
-
-        assert_eq!(hdr.get_version(), 0x1);
-
-        assert_eq!(hdr.is_reply(), false);
-        hdr.set_reply(true);
-        assert_eq!(hdr.is_reply(), true);
-        hdr.set_reply(false);
-
-        assert_eq!(hdr.is_need_reply(), false);
-        hdr.set_need_reply(true);
-        assert_eq!(hdr.is_need_reply(), true);
-        hdr.set_need_reply(false);
-
-        assert_eq!(hdr.get_size(), 0x100);
-        hdr.set_size(0x200);
-        assert_eq!(hdr.get_size(), 0x200);
-
-        assert_eq!(hdr.is_need_reply(), false);
-        assert_eq!(hdr.is_reply(), false);
-        assert_eq!(hdr.get_version(), 0x1);
-
-        // Check message length
-        assert!(hdr.is_valid());
-        hdr.set_size(0x2000);
-        assert!(!hdr.is_valid());
-        hdr.set_size(0x100);
-        assert_eq!(hdr.get_size(), 0x100);
-        assert!(hdr.is_valid());
-        hdr.set_size((MAX_MSG_SIZE - mem::size_of::<VhostUserMsgHeader<MasterReq>>()) as u32);
-        assert!(hdr.is_valid());
-        hdr.set_size(0x0);
-        assert!(hdr.is_valid());
-
-        // Check version
-        hdr.set_version(0x0);
-        assert!(!hdr.is_valid());
-        hdr.set_version(0x2);
-        assert!(!hdr.is_valid());
-        hdr.set_version(0x1);
-        assert!(hdr.is_valid());
-    }
-
-    #[test]
-    fn check_user_memory() {
-        let mut msg = VhostUserMemory::new(1);
-        assert!(msg.is_valid());
-        msg.num_regions = MAX_ATTACHED_FD_ENTRIES as u32;
-        assert!(msg.is_valid());
-
-        msg.num_regions += 1;
-        assert!(!msg.is_valid());
-        msg.num_regions = 0xFFFFFFFF;
-        assert!(!msg.is_valid());
-        msg.num_regions = MAX_ATTACHED_FD_ENTRIES as u32;
-        msg.padding1 = 1;
-        assert!(!msg.is_valid());
-    }
-
-    #[test]
-    fn check_user_memory_region() {
-        let mut msg = VhostUserMemoryRegion {
-            guest_phys_addr: 0,
-            memory_size: 0x1000,
-            user_addr: 0,
-            mmap_offset: 0,
-        };
-        assert!(msg.is_valid());
-        msg.guest_phys_addr = 0xFFFFFFFFFFFFEFFF;
-        assert!(msg.is_valid());
-        msg.guest_phys_addr = 0xFFFFFFFFFFFFF000;
-        assert!(!msg.is_valid());
-        msg.guest_phys_addr = 0xFFFFFFFFFFFF0000;
-        msg.memory_size = 0;
-        assert!(!msg.is_valid());
-    }
-
-    #[test]
-    fn check_user_vring_addr() {
-        let mut msg =
-            VhostUserVringAddr::new(0, VhostUserVringAddrFlags::all(), 0x0, 0x0, 0x0, 0x0);
-        assert!(msg.is_valid());
-
-        msg.descriptor = 1;
-        assert!(!msg.is_valid());
-        msg.descriptor = 0;
-
-        msg.available = 1;
-        assert!(!msg.is_valid());
-        msg.available = 0;
-
-        msg.used = 1;
-        assert!(!msg.is_valid());
-        msg.used = 0;
-
-        msg.flags |= 0x80000000;
-        assert!(!msg.is_valid());
-        msg.flags &= !0x80000000;
-    }
-
-    #[test]
-    fn check_user_config_msg() {
-        let mut msg = VhostUserConfig::new(
-            VHOST_USER_CONFIG_OFFSET,
-            VHOST_USER_CONFIG_SIZE - VHOST_USER_CONFIG_OFFSET,
-            VhostUserConfigFlags::WRITABLE,
-        );
-
-        assert!(msg.is_valid());
-        msg.size = 0;
-        assert!(!msg.is_valid());
-        msg.size = 1;
-        assert!(msg.is_valid());
-        msg.offset = 0;
-        assert!(!msg.is_valid());
-        msg.offset = VHOST_USER_CONFIG_SIZE;
-        assert!(!msg.is_valid());
-        msg.offset = VHOST_USER_CONFIG_SIZE - 1;
-        assert!(msg.is_valid());
-        msg.size = 2;
-        assert!(!msg.is_valid());
-        msg.size = 1;
-        msg.flags |= VhostUserConfigFlags::LIVE_MIGRATION.bits();
-        assert!(msg.is_valid());
-        msg.flags |= 0x4;
-        assert!(!msg.is_valid());
-    }
-}

vhost_rs/src/vhost_user/mod.rs

@@ -1,251 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-//! The protocol for vhost-user is based on the existing implementation of vhost for the Linux
-//! Kernel. The protocol defines two sides of the communication, master and slave. Master is
-//! the application that shares its virtqueues. Slave is the consumer of the virtqueues.
-//!
-//! The communication channel between the master and the slave includes two sub channels. One is
-//! used to send requests from the master to the slave and optional replies from the slave to the
-//! master. This sub channel is created on master startup by connecting to the slave service
-//! endpoint. The other is used to send requests from the slave to the master and optional replies
-//! from the master to the slave. This sub channel is created by the master issuing a
-//! VHOST_USER_SET_SLAVE_REQ_FD request to the slave with an auxiliary file descriptor.
-//!
-//! Unix domain socket is used as the underlying communication channel because the master needs to
-//! send file descriptors to the slave.
-//!
-//! Most messages that can be sent via the Unix domain socket implementing vhost-user have an
-//! equivalent ioctl to the kernel implementation.
-
-use libc;
-use std::io::Error as IOError;
-
-mod connection;
-pub mod message;
-pub use self::connection::Listener;
-#[cfg(feature = "vhost-user-master")]
-mod master;
-#[cfg(feature = "vhost-user-master")]
-pub use self::master::{Master, VhostUserMaster};
-#[cfg(feature = "vhost-user-master")]
-mod master_req_handler;
-#[cfg(feature = "vhost-user-master")]
-pub use self::master_req_handler::{MasterReqHandler, VhostUserMasterReqHandler};
-
-#[cfg(feature = "vhost-user-slave")]
-mod slave;
-#[cfg(feature = "vhost-user-slave")]
-pub use self::slave::SlaveListener;
-#[cfg(feature = "vhost-user-slave")]
-mod slave_req_handler;
-#[cfg(feature = "vhost-user-slave")]
-pub use self::slave_req_handler::{SlaveReqHandler, VhostUserSlaveReqHandler};
-
-pub mod sock_ctrl_msg;
-
-/// Errors for vhost-user operations
-#[derive(Debug)]
-pub enum Error {
-    /// Invalid parameters.
-    InvalidParam,
-    /// Unsupported operations due to that the protocol feature hasn't been negotiated.
-    InvalidOperation,
-    /// Invalid message format, flag or content.
-    InvalidMessage,
-    /// Only part of a message have been sent or received successfully
-    PartialMessage,
-    /// Message is too large
-    OversizedMsg,
-    /// Fd array in question is too big or too small
-    IncorrectFds,
-    /// Can't connect to peer.
-    SocketConnect(std::io::Error),
-    /// Generic socket errors.
-    SocketError(std::io::Error),
-    /// The socket is broken or has been closed.
-    SocketBroken(std::io::Error),
-    /// Should retry the socket operation again.
-    SocketRetry(std::io::Error),
-    /// Failure from the slave side.
-    SlaveInternalError,
-    /// Virtio/protocol features mismatch.
-    FeatureMismatch,
-    /// Error from request handler
-    ReqHandlerError(IOError),
-}
-
-impl std::fmt::Display for Error {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        match self {
-            Error::InvalidParam => write!(f, "invalid parameters"),
-            Error::InvalidOperation => write!(f, "invalid operation"),
-            Error::InvalidMessage => write!(f, "invalid message"),
-            Error::PartialMessage => write!(f, "partial message"),
-            Error::OversizedMsg => write!(f, "oversized message"),
-            Error::IncorrectFds => write!(f, "wrong number of attached fds"),
-            Error::SocketError(e) => write!(f, "socket error: {}", e),
-            Error::SocketConnect(e) => write!(f, "can't connect to peer: {}", e),
-            Error::SocketBroken(e) => write!(f, "socket is broken: {}", e),
-            Error::SocketRetry(e) => write!(f, "temporary socket error: {}", e),
-            Error::SlaveInternalError => write!(f, "slave internal error"),
-            Error::FeatureMismatch => write!(f, "virtio/protocol features mismatch"),
-            Error::ReqHandlerError(e) => write!(f, "handler failed to handle request: {}", e),
-        }
-    }
-}
-
-impl Error {
-    /// Determine whether to rebuild the underline communication channel.
-    pub fn should_reconnect(&self) -> bool {
-        match *self {
-            // Should reconnect because it may be caused by temporary network errors.
-            Error::PartialMessage => true,
-            // Should reconnect because the underline socket is broken.
-            Error::SocketBroken(_) => true,
-            // Slave internal error, hope it recovers on reconnect.
-            Error::SlaveInternalError => true,
-            // Should just retry the IO operation instead of rebuilding the underline connection.
-            Error::SocketRetry(_) => false,
-            Error::InvalidParam | Error::InvalidOperation => false,
-            Error::InvalidMessage | Error::IncorrectFds | Error::OversizedMsg => false,
-            Error::SocketError(_) | Error::SocketConnect(_) => false,
-            Error::FeatureMismatch => false,
-            Error::ReqHandlerError(_) => false,
-        }
-    }
-}
-
-impl std::convert::From<vmm_sys_util::errno::Error> for Error {
-    /// Convert raw socket errors into meaningful vhost-user errors.
-    ///
-    /// The vmm_sys_util::errno::Error is a simple wrapper over the raw errno, which doesn't means much
-    /// to the vhost-user connection manager. So convert it into meaningful errors to simplify
-    /// the connection manager logic.
-    ///
-    /// # Return:
-    /// * - Error::SocketRetry: temporary error caused by signals or short of resources.
-    /// * - Error::SocketBroken: the underline socket is broken.
-    /// * - Error::SocketError: other socket related errors.
-    #[allow(unreachable_patterns)] // EWOULDBLOCK equals to EGAIN on linux
-    fn from(err: vmm_sys_util::errno::Error) -> Self {
-        match err.errno() {
-            // The socket is marked nonblocking and the requested operation would block.
-            libc::EAGAIN => Error::SocketRetry(IOError::from_raw_os_error(libc::EAGAIN)),
-            // The socket is marked nonblocking and the requested operation would block.
-            libc::EWOULDBLOCK => Error::SocketRetry(IOError::from_raw_os_error(libc::EWOULDBLOCK)),
-            // A signal occurred before any data was transmitted
-            libc::EINTR => Error::SocketRetry(IOError::from_raw_os_error(libc::EINTR)),
-            // The  output  queue  for  a network interface was full.  This generally indicates
-            // that the interface has stopped sending, but may be caused by transient congestion.
-            libc::ENOBUFS => Error::SocketRetry(IOError::from_raw_os_error(libc::ENOBUFS)),
-            // No memory available.
-            libc::ENOMEM => Error::SocketRetry(IOError::from_raw_os_error(libc::ENOMEM)),
-            // Connection reset by peer.
-            libc::ECONNRESET => Error::SocketBroken(IOError::from_raw_os_error(libc::ECONNRESET)),
-            // The local end has been shut down on a connection oriented socket. In this  case the
-            // process will also receive a SIGPIPE unless MSG_NOSIGNAL is set.
-            libc::EPIPE => Error::SocketBroken(IOError::from_raw_os_error(libc::EPIPE)),
-            // Write permission is denied on the destination socket file, or search permission is
-            // denied for one of the directories the path prefix.
-            libc::EACCES => Error::SocketConnect(IOError::from_raw_os_error(libc::EACCES)),
-            // Catch all other errors
-            e => Error::SocketError(IOError::from_raw_os_error(e)),
-        }
-    }
-}
-
-/// Result of vhost-user operations
-pub type Result<T> = std::result::Result<T, Error>;
-
-/// Result of request handler.
-pub type HandlerResult<T> = std::result::Result<T, IOError>;
-
-#[cfg(all(test, feature = "vhost-user-master", feature = "vhost-user-slave"))]
-mod dummy_slave;
-
-#[cfg(all(test, feature = "vhost-user-master", feature = "vhost-user-slave"))]
-mod tests {
-    use super::dummy_slave::{DummySlaveReqHandler, VIRTIO_FEATURES};
-    use super::message::*;
-    use super::*;
-    use crate::backend::VhostBackend;
-    use std::sync::{Arc, Barrier, Mutex};
-    use std::thread;
-
-    fn create_slave<S: VhostUserSlaveReqHandler>(
-        path: &str,
-        backend: Arc<Mutex<S>>,
-    ) -> (Master, SlaveReqHandler<S>) {
-        let mut slave_listener = SlaveListener::new(path, true, backend).unwrap();
-        let master = Master::connect(path).unwrap();
-        (master, slave_listener.accept().unwrap().unwrap())
-    }
-
-    #[test]
-    fn create_dummy_slave() {
-        let mut slave = DummySlaveReqHandler::new();
-
-        slave.set_owner().unwrap();
-        assert!(slave.set_owner().is_err());
-    }
-
-    #[test]
-    fn test_set_owner() {
-        let slave_be = Arc::new(Mutex::new(DummySlaveReqHandler::new()));
-        let (mut master, mut slave) =
-            create_slave("/tmp/vhost_user_lib_unit_test_owner", slave_be.clone());
-
-        assert_eq!(slave_be.lock().unwrap().owned, false);
-        master.set_owner().unwrap();
-        slave.handle_request().unwrap();
-        assert_eq!(slave_be.lock().unwrap().owned, true);
-        master.set_owner().unwrap();
-        assert!(slave.handle_request().is_err());
-        assert_eq!(slave_be.lock().unwrap().owned, true);
-    }
-
-    #[test]
-    fn test_set_features() {
-        let mbar = Arc::new(Barrier::new(2));
-        let sbar = mbar.clone();
-        let slave_be = Arc::new(Mutex::new(DummySlaveReqHandler::new()));
-        let (mut master, mut slave) =
-            create_slave("/tmp/vhost_user_lib_unit_test_feature", slave_be.clone());
-
-        thread::spawn(move || {
-            slave.handle_request().unwrap();
-            assert_eq!(slave_be.lock().unwrap().owned, true);
-
-            slave.handle_request().unwrap();
-            slave.handle_request().unwrap();
-            assert_eq!(
-                slave_be.lock().unwrap().acked_features,
-                VIRTIO_FEATURES & !0x1
-            );
-
-            slave.handle_request().unwrap();
-            slave.handle_request().unwrap();
-            assert_eq!(
-                slave_be.lock().unwrap().acked_protocol_features,
-                VhostUserProtocolFeatures::all().bits()
-            );
-
-            sbar.wait();
-        });
-
-        master.set_owner().unwrap();
-
-        // set virtio features
-        let features = master.get_features().unwrap();
-        assert_eq!(features, VIRTIO_FEATURES);
-        master.set_features(VIRTIO_FEATURES & !0x1).unwrap();
-
-        // set vhost protocol features
-        let features = master.get_protocol_features().unwrap();
-        assert_eq!(features.bits(), VhostUserProtocolFeatures::all().bits());
-        master.set_protocol_features(features).unwrap();
-
-        mbar.wait();
-    }
-}

vhost_rs/src/vhost_user/slave.rs

@@ -1,48 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-//! Traits and Structs for vhost-user slave.
-
-use std::sync::{Arc, Mutex};
-
-use super::connection::{Endpoint, Listener};
-use super::message::*;
-use super::{Result, SlaveReqHandler, VhostUserSlaveReqHandler};
-
-/// Vhost-user slave side connection listener.
-pub struct SlaveListener<S: VhostUserSlaveReqHandler> {
-    listener: Listener,
-    backend: Option<Arc<Mutex<S>>>,
-}
-
-/// Sets up a listener for incoming master connections, and handles construction
-/// of a Slave on success.
-impl<S: VhostUserSlaveReqHandler> SlaveListener<S> {
-    /// Create a unix domain socket for incoming master connections.
-    ///
-    /// Be careful, the file at `path` will be unlinked if unlink is true
-    pub fn new(path: &str, unlink: bool, backend: Arc<Mutex<S>>) -> Result<Self> {
-        Ok(SlaveListener {
-            listener: Listener::new(path, unlink)?,
-            backend: Some(backend),
-        })
-    }
-
-    /// Accept an incoming connection from the master, returning Some(Slave) on
-    /// success, or None if the socket is nonblocking and no incoming connection
-    /// was detected
-    pub fn accept(&mut self) -> Result<Option<SlaveReqHandler<S>>> {
-        if let Some(fd) = self.listener.accept()? {
-            return Ok(Some(SlaveReqHandler::new(
-                Endpoint::<MasterReq>::from_stream(fd),
-                self.backend.take().unwrap(),
-            )));
-        }
-        Ok(None)
-    }
-
-    /// Change blocking status on the listener.
-    pub fn set_nonblocking(&self, block: bool) -> Result<()> {
-        self.listener.set_nonblocking(block)
-    }
-}

vhost_rs/src/vhost_user/slave_req_handler.rs

@@ -1,586 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-//! Traits and Structs to handle vhost-user requests from the master to the slave.
-
-use std::mem;
-use std::os::unix::io::{AsRawFd, RawFd};
-use std::slice;
-use std::sync::{Arc, Mutex};
-
-use super::connection::Endpoint;
-use super::message::*;
-use super::{Error, Result};
-
-/// Trait to handle vhost-user requests from the master to the slave.
-#[allow(missing_docs)]
-pub trait VhostUserSlaveReqHandler {
-    fn set_owner(&mut self) -> Result<()>;
-    fn reset_owner(&mut self) -> Result<()>;
-    fn get_features(&mut self) -> Result<u64>;
-    fn set_features(&mut self, features: u64) -> Result<()>;
-    fn set_mem_table(&mut self, ctx: &[VhostUserMemoryRegion], fds: &[RawFd]) -> Result<()>;
-    fn set_vring_num(&mut self, index: u32, num: u32) -> Result<()>;
-    fn set_vring_addr(
-        &mut self,
-        index: u32,
-        flags: VhostUserVringAddrFlags,
-        descriptor: u64,
-        used: u64,
-        available: u64,
-        log: u64,
-    ) -> Result<()>;
-    fn set_vring_base(&mut self, index: u32, base: u32) -> Result<()>;
-    fn get_vring_base(&mut self, index: u32) -> Result<VhostUserVringState>;
-    fn set_vring_kick(&mut self, index: u8, fd: Option<RawFd>) -> Result<()>;
-    fn set_vring_call(&mut self, index: u8, fd: Option<RawFd>) -> Result<()>;
-    fn set_vring_err(&mut self, index: u8, fd: Option<RawFd>) -> Result<()>;
-
-    fn get_protocol_features(&mut self) -> Result<VhostUserProtocolFeatures>;
-    fn set_protocol_features(&mut self, features: u64) -> Result<()>;
-    fn get_queue_num(&mut self) -> Result<u64>;
-    fn set_vring_enable(&mut self, index: u32, enable: bool) -> Result<()>;
-    fn get_config(
-        &mut self,
-        offset: u32,
-        size: u32,
-        flags: VhostUserConfigFlags,
-    ) -> Result<Vec<u8>>;
-    fn set_config(&mut self, offset: u32, buf: &[u8], flags: VhostUserConfigFlags) -> Result<()>;
-}
-
-/// A vhost-user slave endpoint which relays all received requests from the
-/// master to the virtio backend device object.
-///
-/// The lifetime of the SlaveReqHandler object should be the same as the underline Unix Domain
-/// Socket, so it gets simpler to recover from disconnect.
-pub struct SlaveReqHandler<S: VhostUserSlaveReqHandler> {
-    // underlying Unix domain socket for communication
-    main_sock: Endpoint<MasterReq>,
-    // the vhost-user backend device object
-    backend: Arc<Mutex<S>>,
-
-    virtio_features: u64,
-    acked_virtio_features: u64,
-    protocol_features: VhostUserProtocolFeatures,
-    acked_protocol_features: u64,
-
-    // sending ack for messages without payload
-    reply_ack_enabled: bool,
-    // whether the endpoint has encountered any failure
-    error: Option<i32>,
-}
-
-impl<S: VhostUserSlaveReqHandler> SlaveReqHandler<S> {
-    /// Create a vhost-user slave endpoint.
-    pub(super) fn new(main_sock: Endpoint<MasterReq>, backend: Arc<Mutex<S>>) -> Self {
-        SlaveReqHandler {
-            main_sock,
-            backend,
-            virtio_features: 0,
-            acked_virtio_features: 0,
-            protocol_features: VhostUserProtocolFeatures::empty(),
-            acked_protocol_features: 0,
-            reply_ack_enabled: false,
-            error: None,
-        }
-    }
-
-    /// Create a new vhost-user slave endpoint.
-    ///
-    /// # Arguments
-    /// * - `path` - path of Unix domain socket listener to connect to
-    /// * - `backend` - handler for requests from the master to the slave
-    pub fn connect(path: &str, backend: Arc<Mutex<S>>) -> Result<Self> {
-        Ok(Self::new(Endpoint::<MasterReq>::connect(path)?, backend))
-    }
-
-    /// Mark endpoint as failed with specified error code.
-    pub fn set_failed(&mut self, error: i32) {
-        self.error = Some(error);
-    }
-
-    /// Receive and handle one incoming request message from the master.
-    /// The caller needs to:
-    /// . serialize calls to this function
-    /// . decide what to do when error happens
-    /// . optional recover from failure
-    pub fn handle_request(&mut self) -> Result<()> {
-        // Return error if the endpoint is already in failed state.
-        self.check_state()?;
-
-        // The underlying communication channel is a Unix domain socket in
-        // stream mode, and recvmsg() is a little tricky here. To successfully
-        // receive attached file descriptors, we need to receive messages and
-        // corresponding attached file descriptors in this way:
-        // . recv messsage header and optional attached file
-        // . validate message header
-        // . recv optional message body and payload according size field in
-        //   message header
-        // . validate message body and optional payload
-        let (hdr, rfds) = self.main_sock.recv_header()?;
-        let rfds = self.check_attached_rfds(&hdr, rfds)?;
-        let (size, buf) = match hdr.get_size() {
-            0 => (0, vec![0u8; 0]),
-            len => {
-                let (size2, rbuf) = self.main_sock.recv_data(len as usize)?;
-                if size2 != len as usize {
-                    return Err(Error::InvalidMessage);
-                }
-                (size2, rbuf)
-            }
-        };
-
-        match hdr.get_code() {
-            MasterReq::SET_OWNER => {
-                self.check_request_size(&hdr, size, 0)?;
-                self.backend.lock().unwrap().set_owner()?;
-            }
-            MasterReq::RESET_OWNER => {
-                self.check_request_size(&hdr, size, 0)?;
-                self.backend.lock().unwrap().reset_owner()?;
-            }
-            MasterReq::GET_FEATURES => {
-                self.check_request_size(&hdr, size, 0)?;
-                let features = self.backend.lock().unwrap().get_features()?;
-                let msg = VhostUserU64::new(features);
-                self.send_reply_message(&hdr, &msg)?;
-                self.virtio_features = features;
-                self.update_reply_ack_flag();
-            }
-            MasterReq::SET_FEATURES => {
-                let msg = self.extract_request_body::<VhostUserU64>(&hdr, size, &buf)?;
-                self.backend.lock().unwrap().set_features(msg.value)?;
-                self.acked_virtio_features = msg.value;
-                self.update_reply_ack_flag();
-            }
-            MasterReq::SET_MEM_TABLE => {
-                let res = self.set_mem_table(&hdr, size, &buf, rfds);
-                self.send_ack_message(&hdr, res)?;
-            }
-            MasterReq::SET_VRING_NUM => {
-                let msg = self.extract_request_body::<VhostUserVringState>(&hdr, size, &buf)?;
-                let res = self
-                    .backend
-                    .lock()
-                    .unwrap()
-                    .set_vring_num(msg.index, msg.num);
-                self.send_ack_message(&hdr, res)?;
-            }
-            MasterReq::SET_VRING_ADDR => {
-                let msg = self.extract_request_body::<VhostUserVringAddr>(&hdr, size, &buf)?;
-                let flags = match VhostUserVringAddrFlags::from_bits(msg.flags) {
-                    Some(val) => val,
-                    None => return Err(Error::InvalidMessage),
-                };
-                let res = self.backend.lock().unwrap().set_vring_addr(
-                    msg.index,
-                    flags,
-                    msg.descriptor,
-                    msg.used,
-                    msg.available,
-                    msg.log,
-                );
-                self.send_ack_message(&hdr, res)?;
-            }
-            MasterReq::SET_VRING_BASE => {
-                let msg = self.extract_request_body::<VhostUserVringState>(&hdr, size, &buf)?;
-                let res = self
-                    .backend
-                    .lock()
-                    .unwrap()
-                    .set_vring_base(msg.index, msg.num);
-                self.send_ack_message(&hdr, res)?;
-            }
-            MasterReq::GET_VRING_BASE => {
-                let msg = self.extract_request_body::<VhostUserVringState>(&hdr, size, &buf)?;
-                let reply = self.backend.lock().unwrap().get_vring_base(msg.index)?;
-                self.send_reply_message(&hdr, &reply)?;
-            }
-            MasterReq::SET_VRING_CALL => {
-                self.check_request_size(&hdr, size, mem::size_of::<VhostUserU64>())?;
-                let (index, rfds) = self.handle_vring_fd_request(&buf, rfds)?;
-                let res = self.backend.lock().unwrap().set_vring_call(index, rfds);
-                self.send_ack_message(&hdr, res)?;
-            }
-            MasterReq::SET_VRING_KICK => {
-                self.check_request_size(&hdr, size, mem::size_of::<VhostUserU64>())?;
-                let (index, rfds) = self.handle_vring_fd_request(&buf, rfds)?;
-                let res = self.backend.lock().unwrap().set_vring_kick(index, rfds);
-                self.send_ack_message(&hdr, res)?;
-            }
-            MasterReq::SET_VRING_ERR => {
-                self.check_request_size(&hdr, size, mem::size_of::<VhostUserU64>())?;
-                let (index, rfds) = self.handle_vring_fd_request(&buf, rfds)?;
-                let res = self.backend.lock().unwrap().set_vring_err(index, rfds);
-                self.send_ack_message(&hdr, res)?;
-            }
-            MasterReq::GET_PROTOCOL_FEATURES => {
-                self.check_request_size(&hdr, size, 0)?;
-                let features = self.backend.lock().unwrap().get_protocol_features()?;
-                let msg = VhostUserU64::new(features.bits());
-                self.send_reply_message(&hdr, &msg)?;
-                self.protocol_features = features;
-                self.update_reply_ack_flag();
-            }
-            MasterReq::SET_PROTOCOL_FEATURES => {
-                let msg = self.extract_request_body::<VhostUserU64>(&hdr, size, &buf)?;
-                self.backend
-                    .lock()
-                    .unwrap()
-                    .set_protocol_features(msg.value)?;
-                self.acked_protocol_features = msg.value;
-                self.update_reply_ack_flag();
-            }
-            MasterReq::GET_QUEUE_NUM => {
-                if self.acked_protocol_features & VhostUserProtocolFeatures::MQ.bits() == 0 {
-                    return Err(Error::InvalidOperation);
-                }
-                self.check_request_size(&hdr, size, 0)?;
-                let num = self.backend.lock().unwrap().get_queue_num()?;
-                let msg = VhostUserU64::new(num);
-                self.send_reply_message(&hdr, &msg)?;
-            }
-            MasterReq::SET_VRING_ENABLE => {
-                let msg = self.extract_request_body::<VhostUserVringState>(&hdr, size, &buf)?;
-                if self.acked_protocol_features & VhostUserProtocolFeatures::MQ.bits() == 0
-                    && msg.index > 0
-                {
-                    return Err(Error::InvalidOperation);
-                }
-                let enable = match msg.num {
-                    1 => true,
-                    0 => false,
-                    _ => return Err(Error::InvalidParam),
-                };
-
-                let res = self
-                    .backend
-                    .lock()
-                    .unwrap()
-                    .set_vring_enable(msg.index, enable);
-                self.send_ack_message(&hdr, res)?;
-            }
-            MasterReq::GET_CONFIG => {
-                if self.acked_protocol_features & VhostUserProtocolFeatures::CONFIG.bits() == 0 {
-                    return Err(Error::InvalidOperation);
-                }
-                self.get_config(&hdr, &buf)?;
-            }
-            MasterReq::SET_CONFIG => {
-                if self.acked_protocol_features & VhostUserProtocolFeatures::CONFIG.bits() == 0 {
-                    return Err(Error::InvalidOperation);
-                }
-                self.check_request_size(&hdr, size, hdr.get_size() as usize)?;
-                self.set_config(&hdr, size, &buf)?;
-            }
-            _ => {
-                return Err(Error::InvalidMessage);
-            }
-        }
-        Ok(())
-    }
-
-    fn set_mem_table(
-        &mut self,
-        hdr: &VhostUserMsgHeader<MasterReq>,
-        size: usize,
-        buf: &[u8],
-        rfds: Option<Vec<RawFd>>,
-    ) -> Result<()> {
-        self.check_request_size(&hdr, size, hdr.get_size() as usize)?;
-
-        // check message size is consistent
-        let hdrsize = mem::size_of::<VhostUserMemory>();
-        if size < hdrsize {
-            Endpoint::<MasterReq>::close_rfds(rfds);
-            return Err(Error::InvalidMessage);
-        }
-        let msg = unsafe { &*(buf.as_ptr() as *const VhostUserMemory) };
-        if !msg.is_valid() {
-            Endpoint::<MasterReq>::close_rfds(rfds);
-            return Err(Error::InvalidMessage);
-        }
-        if size != hdrsize + msg.num_regions as usize * mem::size_of::<VhostUserMemoryRegion>() {
-            Endpoint::<MasterReq>::close_rfds(rfds);
-            return Err(Error::InvalidMessage);
-        }
-
-        // validate number of fds matching number of memory regions
-        let fds = match rfds {
-            None => return Err(Error::InvalidMessage),
-            Some(fds) => {
-                if fds.len() != msg.num_regions as usize {
-                    Endpoint::<MasterReq>::close_rfds(Some(fds));
-                    return Err(Error::InvalidMessage);
-                }
-                fds
-            }
-        };
-
-        // Validate memory regions
-        let regions = unsafe {
-            slice::from_raw_parts(
-                buf.as_ptr().add(hdrsize) as *const VhostUserMemoryRegion,
-                msg.num_regions as usize,
-            )
-        };
-        for region in regions.iter() {
-            if !region.is_valid() {
-                Endpoint::<MasterReq>::close_rfds(Some(fds));
-                return Err(Error::InvalidMessage);
-            }
-        }
-
-        self.backend.lock().unwrap().set_mem_table(&regions, &fds)
-    }
-
-    fn get_config(&mut self, hdr: &VhostUserMsgHeader<MasterReq>, buf: &[u8]) -> Result<()> {
-        let msg = unsafe { &*(buf.as_ptr() as *const VhostUserConfig) };
-        if !msg.is_valid() {
-            return Err(Error::InvalidMessage);
-        }
-        let payload_offset = mem::size_of::<VhostUserConfig>();
-        if buf.len() - payload_offset != msg.size as usize {
-            return Err(Error::InvalidMessage);
-        }
-        let flags = match VhostUserConfigFlags::from_bits(msg.flags) {
-            Some(val) => val,
-            None => return Err(Error::InvalidMessage),
-        };
-        let res = self
-            .backend
-            .lock()
-            .unwrap()
-            .get_config(msg.offset, msg.size, flags);
-
-        // vhost-user slave's payload size MUST match master's request
-        // on success, uses zero length of payload to indicate an error
-        // to vhost-user master.
-        match res {
-            Ok(ref buf) if buf.len() == msg.size as usize => {
-                let reply = VhostUserConfig::new(msg.offset, buf.len() as u32, flags);
-                self.send_reply_with_payload(&hdr, &reply, buf.as_slice())?;
-            }
-            Ok(_) => {
-                let reply = VhostUserConfig::new(msg.offset, 0, flags);
-                self.send_reply_message(&hdr, &reply)?;
-            }
-            Err(_) => {
-                let reply = VhostUserConfig::new(msg.offset, 0, flags);
-                self.send_reply_message(&hdr, &reply)?;
-            }
-        }
-        Ok(())
-    }
-
-    fn set_config(
-        &mut self,
-        hdr: &VhostUserMsgHeader<MasterReq>,
-        size: usize,
-        buf: &[u8],
-    ) -> Result<()> {
-        if size < mem::size_of::<VhostUserConfig>() {
-            return Err(Error::InvalidMessage);
-        }
-        let msg = unsafe { &*(buf.as_ptr() as *const VhostUserConfig) };
-        if !msg.is_valid() {
-            return Err(Error::InvalidMessage);
-        }
-        if size - mem::size_of::<VhostUserConfig>() != msg.size as usize {
-            return Err(Error::InvalidMessage);
-        }
-        let flags: VhostUserConfigFlags;
-        match VhostUserConfigFlags::from_bits(msg.flags) {
-            Some(val) => flags = val,
-            None => return Err(Error::InvalidMessage),
-        }
-
-        let res = self
-            .backend
-            .lock()
-            .unwrap()
-            .set_config(msg.offset, buf, flags);
-        self.send_ack_message(&hdr, res)?;
-        Ok(())
-    }
-
-    fn handle_vring_fd_request(
-        &mut self,
-        buf: &[u8],
-        rfds: Option<Vec<RawFd>>,
-    ) -> Result<(u8, Option<RawFd>)> {
-        let msg = unsafe { &*(buf.as_ptr() as *const VhostUserU64) };
-        if !msg.is_valid() {
-            return Err(Error::InvalidMessage);
-        }
-
-        // Bits (0-7) of the payload contain the vring index. Bit 8 is the
-        // invalid FD flag. This flag is set when there is no file descriptor
-        // in the ancillary data. This signals that polling will be used
-        // instead of waiting for the call.
-        let nofd = match msg.value & 0x100u64 {
-            0x100u64 => true,
-            _ => false,
-        };
-
-        let mut rfd = None;
-        match rfds {
-            Some(fds) => {
-                if !nofd && fds.len() == 1 {
-                    rfd = Some(fds[0]);
-                } else if (nofd && !fds.is_empty()) || (!nofd && fds.len() != 1) {
-                    Endpoint::<MasterReq>::close_rfds(Some(fds));
-                    return Err(Error::InvalidMessage);
-                }
-            }
-            None => {
-                if !nofd {
-                    return Err(Error::InvalidMessage);
-                }
-            }
-        }
-        Ok((msg.value as u8, rfd))
-    }
-
-    fn check_state(&self) -> Result<()> {
-        match self.error {
-            Some(e) => Err(Error::SocketBroken(std::io::Error::from_raw_os_error(e))),
-            None => Ok(()),
-        }
-    }
-
-    fn check_request_size(
-        &self,
-        hdr: &VhostUserMsgHeader<MasterReq>,
-        size: usize,
-        expected: usize,
-    ) -> Result<()> {
-        if hdr.get_size() as usize != expected
-            || hdr.is_reply()
-            || hdr.get_version() != 0x1
-            || size != expected
-        {
-            return Err(Error::InvalidMessage);
-        }
-        Ok(())
-    }
-
-    fn check_attached_rfds(
-        &self,
-        hdr: &VhostUserMsgHeader<MasterReq>,
-        rfds: Option<Vec<RawFd>>,
-    ) -> Result<Option<Vec<RawFd>>> {
-        match hdr.get_code() {
-            MasterReq::SET_MEM_TABLE => Ok(rfds),
-            MasterReq::SET_VRING_CALL => Ok(rfds),
-            MasterReq::SET_VRING_KICK => Ok(rfds),
-            MasterReq::SET_VRING_ERR => Ok(rfds),
-            MasterReq::SET_LOG_BASE => Ok(rfds),
-            MasterReq::SET_LOG_FD => Ok(rfds),
-            MasterReq::SET_SLAVE_REQ_FD => Ok(rfds),
-            MasterReq::SET_INFLIGHT_FD => Ok(rfds),
-            _ => {
-                if rfds.is_some() {
-                    Endpoint::<MasterReq>::close_rfds(rfds);
-                    Err(Error::InvalidMessage)
-                } else {
-                    Ok(rfds)
-                }
-            }
-        }
-    }
-
-    fn extract_request_body<'a, T: Sized + VhostUserMsgValidator>(
-        &self,
-        hdr: &VhostUserMsgHeader<MasterReq>,
-        size: usize,
-        buf: &'a [u8],
-    ) -> Result<&'a T> {
-        self.check_request_size(hdr, size, mem::size_of::<T>())?;
-        let msg = unsafe { &*(buf.as_ptr() as *const T) };
-        if !msg.is_valid() {
-            return Err(Error::InvalidMessage);
-        }
-        Ok(msg)
-    }
-
-    fn update_reply_ack_flag(&mut self) {
-        let vflag = VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
-        let pflag = VhostUserProtocolFeatures::REPLY_ACK;
-        if (self.virtio_features & vflag) != 0
-            && (self.acked_virtio_features & vflag) != 0
-            && self.protocol_features.contains(pflag)
-            && (self.acked_protocol_features & pflag.bits()) != 0
-        {
-            self.reply_ack_enabled = true;
-        } else {
-            self.reply_ack_enabled = false;
-        }
-    }
-
-    fn new_reply_header<T: Sized>(
-        &self,
-        req: &VhostUserMsgHeader<MasterReq>,
-        payload_size: usize,
-    ) -> Result<VhostUserMsgHeader<MasterReq>> {
-        if mem::size_of::<T>() > MAX_MSG_SIZE {
-            return Err(Error::InvalidParam);
-        }
-        self.check_state()?;
-        Ok(VhostUserMsgHeader::new(
-            req.get_code(),
-            VhostUserHeaderFlag::REPLY.bits(),
-            (mem::size_of::<T>() + payload_size) as u32,
-        ))
-    }
-
-    fn send_ack_message(
-        &mut self,
-        req: &VhostUserMsgHeader<MasterReq>,
-        res: Result<()>,
-    ) -> Result<()> {
-        if self.reply_ack_enabled {
-            let hdr = self.new_reply_header::<VhostUserU64>(req, 0)?;
-            let val = match res {
-                Ok(_) => 0,
-                Err(_) => 1,
-            };
-            let msg = VhostUserU64::new(val);
-            self.main_sock.send_message(&hdr, &msg, None)?;
-        }
-        Ok(())
-    }
-
-    fn send_reply_message<T>(
-        &mut self,
-        req: &VhostUserMsgHeader<MasterReq>,
-        msg: &T,
-    ) -> Result<()> {
-        let hdr = self.new_reply_header::<T>(req, 0)?;
-        self.main_sock.send_message(&hdr, msg, None)?;
-        Ok(())
-    }
-
-    fn send_reply_with_payload<T, P>(
-        &mut self,
-        req: &VhostUserMsgHeader<MasterReq>,
-        msg: &T,
-        payload: &[P],
-    ) -> Result<()>
-    where
-        T: Sized,
-        P: Sized,
-    {
-        let hdr = self.new_reply_header::<T>(req, payload.len())?;
-        self.main_sock
-            .send_message_with_payload(&hdr, msg, payload, None)?;
-        Ok(())
-    }
-}
-
-impl<S: VhostUserSlaveReqHandler> AsRawFd for SlaveReqHandler<S> {
-    fn as_raw_fd(&self) -> RawFd {
-        self.main_sock.as_raw_fd()
-    }
-}

vhost_rs/src/vhost_user/sock_ctrl_msg.rs

@@ -1,464 +0,0 @@
-// Copyright 2017 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-//! Used to send and receive messages with file descriptors on sockets that accept control messages
-//! (e.g. Unix domain sockets).
-
-// TODO: move this file into the vmm-sys-util crate
-
-use std::fs::File;
-use std::mem::size_of;
-use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
-use std::os::unix::net::{UnixDatagram, UnixStream};
-use std::ptr::{copy_nonoverlapping, null_mut, write_unaligned};
-
-use libc::{
-    c_long, c_void, cmsghdr, iovec, msghdr, recvmsg, sendmsg, MSG_NOSIGNAL, SCM_RIGHTS, SOL_SOCKET,
-};
-use vmm_sys_util::errno::{Error, Result};
-
-// Each of the following macros performs the same function as their C counterparts. They are each
-// macros because they are used to size statically allocated arrays.
-
-macro_rules! CMSG_ALIGN {
-    ($len:expr) => {
-        (($len) + size_of::<c_long>() - 1) & !(size_of::<c_long>() - 1)
-    };
-}
-
-macro_rules! CMSG_SPACE {
-    ($len:expr) => {
-        size_of::<cmsghdr>() + CMSG_ALIGN!($len)
-    };
-}
-
-macro_rules! CMSG_LEN {
-    ($len:expr) => {
-        size_of::<cmsghdr>() + ($len)
-    };
-}
-
-// This function (macro in the C version) is not used in any compile time constant slots, so is just
-// an ordinary function. The returned pointer is hard coded to be RawFd because that's all that this
-// module supports.
-#[allow(non_snake_case)]
-#[inline(always)]
-fn CMSG_DATA(cmsg_buffer: *mut cmsghdr) -> *mut RawFd {
-    // Essentially returns a pointer to just past the header.
-    cmsg_buffer.wrapping_offset(1) as *mut RawFd
-}
-
-// This function is like CMSG_NEXT, but safer because it reads only from references, although it
-// does some pointer arithmetic on cmsg_ptr.
-#[cfg_attr(feature = "cargo-clippy", allow(clippy::cast_ptr_alignment))]
-fn get_next_cmsg(msghdr: &msghdr, cmsg: &cmsghdr, cmsg_ptr: *mut cmsghdr) -> *mut cmsghdr {
-    let next_cmsg = (cmsg_ptr as *mut u8).wrapping_add(CMSG_ALIGN!(cmsg.cmsg_len)) as *mut cmsghdr;
-    if next_cmsg
-        .wrapping_offset(1)
-        .wrapping_sub(msghdr.msg_control as usize) as usize
-        > msghdr.msg_controllen
-    {
-        null_mut()
-    } else {
-        next_cmsg
-    }
-}
-
-const CMSG_BUFFER_INLINE_CAPACITY: usize = CMSG_SPACE!(size_of::<RawFd>() * 32);
-
-enum CmsgBuffer {
-    Inline([u64; (CMSG_BUFFER_INLINE_CAPACITY + 7) / 8]),
-    Heap(Box<[cmsghdr]>),
-}
-
-impl CmsgBuffer {
-    fn with_capacity(capacity: usize) -> CmsgBuffer {
-        let cap_in_cmsghdr_units =
-            (capacity.checked_add(size_of::<cmsghdr>()).unwrap() - 1) / size_of::<cmsghdr>();
-        if capacity <= CMSG_BUFFER_INLINE_CAPACITY {
-            CmsgBuffer::Inline([0u64; (CMSG_BUFFER_INLINE_CAPACITY + 7) / 8])
-        } else {
-            CmsgBuffer::Heap(
-                vec![
-                    cmsghdr {
-                        cmsg_len: 0,
-                        cmsg_level: 0,
-                        cmsg_type: 0,
-                    };
-                    cap_in_cmsghdr_units
-                ]
-                .into_boxed_slice(),
-            )
-        }
-    }
-
-    fn as_mut_ptr(&mut self) -> *mut cmsghdr {
-        match self {
-            CmsgBuffer::Inline(a) => a.as_mut_ptr() as *mut cmsghdr,
-            CmsgBuffer::Heap(a) => a.as_mut_ptr(),
-        }
-    }
-}
-
-fn raw_sendmsg<D: IntoIovec>(fd: RawFd, out_data: &[D], out_fds: &[RawFd]) -> Result<usize> {
-    let cmsg_capacity = CMSG_SPACE!(size_of::<RawFd>() * out_fds.len());
-    let mut cmsg_buffer = CmsgBuffer::with_capacity(cmsg_capacity);
-
-    let mut iovecs = Vec::with_capacity(out_data.len());
-    for data in out_data {
-        iovecs.push(iovec {
-            iov_base: data.as_ptr() as *mut c_void,
-            iov_len: data.size(),
-        });
-    }
-
-    let mut msg = msghdr {
-        msg_name: null_mut(),
-        msg_namelen: 0,
-        msg_iov: iovecs.as_mut_ptr(),
-        msg_iovlen: iovecs.len(),
-        msg_control: null_mut(),
-        msg_controllen: 0,
-        msg_flags: 0,
-    };
-
-    if !out_fds.is_empty() {
-        let cmsg = cmsghdr {
-            cmsg_len: CMSG_LEN!(size_of::<RawFd>() * out_fds.len()),
-            cmsg_level: SOL_SOCKET,
-            cmsg_type: SCM_RIGHTS,
-        };
-        unsafe {
-            // Safe because cmsg_buffer was allocated to be large enough to contain cmsghdr.
-            write_unaligned(cmsg_buffer.as_mut_ptr() as *mut cmsghdr, cmsg);
-            // Safe because the cmsg_buffer was allocated to be large enough to hold out_fds.len()
-            // file descriptors.
-            copy_nonoverlapping(
-                out_fds.as_ptr(),
-                CMSG_DATA(cmsg_buffer.as_mut_ptr()),
-                out_fds.len(),
-            );
-        }
-
-        msg.msg_control = cmsg_buffer.as_mut_ptr() as *mut c_void;
-        msg.msg_controllen = cmsg_capacity;
-    }
-
-    // Safe because the msghdr was properly constructed from valid (or null) pointers of the
-    // indicated length and we check the return value.
-    let write_count = unsafe { sendmsg(fd, &msg, MSG_NOSIGNAL) };
-
-    if write_count == -1 {
-        Err(Error::last())
-    } else {
-        Ok(write_count as usize)
-    }
-}
-
-fn raw_recvmsg(fd: RawFd, iovecs: &mut [iovec], in_fds: &mut [RawFd]) -> Result<(usize, usize)> {
-    let cmsg_capacity = CMSG_SPACE!(size_of::<RawFd>() * in_fds.len());
-    let mut cmsg_buffer = CmsgBuffer::with_capacity(cmsg_capacity);
-    let mut msg = msghdr {
-        msg_name: null_mut(),
-        msg_namelen: 0,
-        msg_iov: iovecs.as_mut_ptr(),
-        msg_iovlen: iovecs.len(),
-        msg_control: null_mut(),
-        msg_controllen: 0,
-        msg_flags: 0,
-    };
-
-    if !in_fds.is_empty() {
-        msg.msg_control = cmsg_buffer.as_mut_ptr() as *mut c_void;
-        msg.msg_controllen = cmsg_capacity;
-    }
-
-    // Safe because the msghdr was properly constructed from valid (or null) pointers of the
-    // indicated length and we check the return value.
-    let total_read = unsafe { recvmsg(fd, &mut msg, libc::MSG_WAITALL) };
-
-    if total_read == -1 {
-        return Err(Error::last());
-    }
-
-    if total_read == 0 && msg.msg_controllen < size_of::<cmsghdr>() {
-        return Ok((0, 0));
-    }
-
-    let mut cmsg_ptr = msg.msg_control as *mut cmsghdr;
-    let mut in_fds_count = 0;
-    while !cmsg_ptr.is_null() {
-        // Safe because we checked that cmsg_ptr was non-null, and the loop is constructed such that
-        // that only happens when there is at least sizeof(cmsghdr) space after the pointer to read.
-        let cmsg = unsafe { (cmsg_ptr as *mut cmsghdr).read_unaligned() };
-
-        if cmsg.cmsg_level == SOL_SOCKET && cmsg.cmsg_type == SCM_RIGHTS {
-            let fd_count = (cmsg.cmsg_len - CMSG_LEN!(0)) / size_of::<RawFd>();
-            unsafe {
-                copy_nonoverlapping(
-                    CMSG_DATA(cmsg_ptr),
-                    in_fds[in_fds_count..(in_fds_count + fd_count)].as_mut_ptr(),
-                    fd_count,
-                );
-            }
-            in_fds_count += fd_count;
-        }
-
-        cmsg_ptr = get_next_cmsg(&msg, &cmsg, cmsg_ptr);
-    }
-
-    Ok((total_read as usize, in_fds_count))
-}
-
-/// Trait for file descriptors can send and receive socket control messages via `sendmsg` and
-/// `recvmsg`.
-pub trait ScmSocket {
-    /// Gets the file descriptor of this socket.
-    fn socket_fd(&self) -> RawFd;
-
-    /// Sends the given data and file descriptor over the socket.
-    ///
-    /// On success, returns the number of bytes sent.
-    ///
-    /// # Arguments
-    ///
-    /// * `buf` - A buffer of data to send on the `socket`.
-    /// * `fd` - A file descriptors to be sent.
-    fn send_with_fd<D: IntoIovec>(&self, buf: D, fd: RawFd) -> Result<usize> {
-        self.send_with_fds(&[buf], &[fd])
-    }
-
-    /// Sends the given data and file descriptors over the socket.
-    ///
-    /// On success, returns the number of bytes sent.
-    ///
-    /// # Arguments
-    ///
-    /// * `bufs` - A list of data buffer to send on the `socket`.
-    /// * `fds` - A list of file descriptors to be sent.
-    fn send_with_fds<D: IntoIovec>(&self, bufs: &[D], fds: &[RawFd]) -> Result<usize> {
-        raw_sendmsg(self.socket_fd(), bufs, fds)
-    }
-
-    /// Receives data and potentially a file descriptor from the socket.
-    ///
-    /// On success, returns the number of bytes and an optional file descriptor.
-    ///
-    /// # Arguments
-    ///
-    /// * `buf` - A buffer to receive data from the socket.
-    fn recv_with_fd(&self, buf: &mut [u8]) -> Result<(usize, Option<File>)> {
-        let mut fd = [0];
-        let mut iovecs = [iovec {
-            iov_base: buf.as_mut_ptr() as *mut c_void,
-            iov_len: buf.len(),
-        }];
-
-        let (read_count, fd_count) = self.recv_with_fds(&mut iovecs[..], &mut fd)?;
-        let file = if fd_count == 0 {
-            None
-        } else {
-            // Safe because the first fd from recv_with_fds is owned by us and valid because this
-            // branch was taken.
-            Some(unsafe { File::from_raw_fd(fd[0]) })
-        };
-        Ok((read_count, file))
-    }
-
-    /// Receives data and file descriptors from the socket.
-    ///
-    /// On success, returns the number of bytes and file descriptors received as a tuple
-    /// `(bytes count, files count)`.
-    ///
-    /// # Arguments
-    ///
-    /// * `iovecs` - A list of iovec to receive data from the socket.
-    /// * `fds` - A slice of `RawFd`s to put the received file descriptors into. On success, the
-    ///           number of valid file descriptors is indicated by the second element of the
-    ///           returned tuple. The caller owns these file descriptors, but they will not be
-    ///           closed on drop like a `File`-like type would be. It is recommended that each valid
-    ///           file descriptor gets wrapped in a drop type that closes it after this returns.
-    fn recv_with_fds(&self, iovecs: &mut [iovec], fds: &mut [RawFd]) -> Result<(usize, usize)> {
-        raw_recvmsg(self.socket_fd(), iovecs, fds)
-    }
-}
-
-impl ScmSocket for UnixDatagram {
-    fn socket_fd(&self) -> RawFd {
-        self.as_raw_fd()
-    }
-}
-
-impl ScmSocket for UnixStream {
-    fn socket_fd(&self) -> RawFd {
-        self.as_raw_fd()
-    }
-}
-
-/// Trait for types that can be converted into an `iovec` that can be referenced by a syscall for
-/// the lifetime of this object.
-///
-/// This trait is unsafe because interfaces that use this trait depend on the base pointer and size
-/// being accurate.
-pub unsafe trait IntoIovec {
-    /// Gets the base pointer of this `iovec`.
-    fn as_ptr(&self) -> *const c_void;
-
-    /// Gets the size in bytes of this `iovec`.
-    fn size(&self) -> usize;
-}
-
-// Safe because this slice can not have another mutable reference and it's pointer and size are
-// guaranteed to be valid.
-unsafe impl<'a> IntoIovec for &'a [u8] {
-    // Clippy false positive: https://github.com/rust-lang/rust-clippy/issues/3480
-    #[cfg_attr(feature = "cargo-clippy", allow(clippy::useless_asref))]
-    fn as_ptr(&self) -> *const c_void {
-        self.as_ref().as_ptr() as *const c_void
-    }
-
-    fn size(&self) -> usize {
-        self.len()
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    use std::io::Write;
-    use std::mem::size_of;
-    use std::os::raw::c_long;
-    use std::os::unix::net::UnixDatagram;
-    use std::slice::from_raw_parts;
-
-    use libc::cmsghdr;
-
-    use vmm_sys_util::eventfd::EventFd;
-
-    #[test]
-    fn buffer_len() {
-        assert_eq!(CMSG_SPACE!(0 * size_of::<RawFd>()), size_of::<cmsghdr>());
-        assert_eq!(
-            CMSG_SPACE!(1 * size_of::<RawFd>()),
-            size_of::<cmsghdr>() + size_of::<c_long>()
-        );
-        if size_of::<RawFd>() == 4 {
-            assert_eq!(
-                CMSG_SPACE!(2 * size_of::<RawFd>()),
-                size_of::<cmsghdr>() + size_of::<c_long>()
-            );
-            assert_eq!(
-                CMSG_SPACE!(3 * size_of::<RawFd>()),
-                size_of::<cmsghdr>() + size_of::<c_long>() * 2
-            );
-            assert_eq!(
-                CMSG_SPACE!(4 * size_of::<RawFd>()),
-                size_of::<cmsghdr>() + size_of::<c_long>() * 2
-            );
-        } else if size_of::<RawFd>() == 8 {
-            assert_eq!(
-                CMSG_SPACE!(2 * size_of::<RawFd>()),
-                size_of::<cmsghdr>() + size_of::<c_long>() * 2
-            );
-            assert_eq!(
-                CMSG_SPACE!(3 * size_of::<RawFd>()),
-                size_of::<cmsghdr>() + size_of::<c_long>() * 3
-            );
-            assert_eq!(
-                CMSG_SPACE!(4 * size_of::<RawFd>()),
-                size_of::<cmsghdr>() + size_of::<c_long>() * 4
-            );
-        }
-    }
-
-    #[test]
-    fn send_recv_no_fd() {
-        let (s1, s2) = UnixDatagram::pair().expect("failed to create socket pair");
-
-        let write_count = s1
-            .send_with_fds(&[[1u8, 1, 2].as_ref(), [21u8, 34, 55].as_ref()], &[])
-            .expect("failed to send data");
-
-        assert_eq!(write_count, 6);
-
-        let mut buf = [0u8; 6];
-        let mut files = [0; 1];
-        let mut iovecs = [iovec {
-            iov_base: buf.as_mut_ptr() as *mut c_void,
-            iov_len: buf.len(),
-        }];
-        let (read_count, file_count) = s2
-            .recv_with_fds(&mut iovecs[..], &mut files)
-            .expect("failed to recv data");
-
-        assert_eq!(read_count, 6);
-        assert_eq!(file_count, 0);
-        assert_eq!(buf, [1, 1, 2, 21, 34, 55]);
-    }
-
-    #[test]
-    fn send_recv_only_fd() {
-        let (s1, s2) = UnixDatagram::pair().expect("failed to create socket pair");
-
-        let evt = EventFd::new(0).expect("failed to create eventfd");
-        let write_count = s1
-            .send_with_fd([].as_ref(), evt.as_raw_fd())
-            .expect("failed to send fd");
-
-        assert_eq!(write_count, 0);
-
-        let (read_count, file_opt) = s2.recv_with_fd(&mut []).expect("failed to recv fd");
-
-        let mut file = file_opt.unwrap();
-
-        assert_eq!(read_count, 0);
-        assert!(file.as_raw_fd() >= 0);
-        assert_ne!(file.as_raw_fd(), s1.as_raw_fd());
-        assert_ne!(file.as_raw_fd(), s2.as_raw_fd());
-        assert_ne!(file.as_raw_fd(), evt.as_raw_fd());
-
-        file.write(unsafe { from_raw_parts(&1203u64 as *const u64 as *const u8, 8) })
-            .expect("failed to write to sent fd");
-
-        assert_eq!(evt.read().expect("failed to read from eventfd"), 1203);
-    }
-
-    #[test]
-    fn send_recv_with_fd() {
-        let (s1, s2) = UnixDatagram::pair().expect("failed to create socket pair");
-
-        let evt = EventFd::new(0).expect("failed to create eventfd");
-        let write_count = s1
-            .send_with_fds(&[[237].as_ref()], &[evt.as_raw_fd()])
-            .expect("failed to send fd");
-
-        assert_eq!(write_count, 1);
-
-        let mut files = [0; 2];
-        let mut buf = [0u8];
-        let mut iovecs = [iovec {
-            iov_base: buf.as_mut_ptr() as *mut c_void,
-            iov_len: buf.len(),
-        }];
-        let (read_count, file_count) = s2
-            .recv_with_fds(&mut iovecs[..], &mut files)
-            .expect("failed to recv fd");
-
-        assert_eq!(read_count, 1);
-        assert_eq!(buf[0], 237);
-        assert_eq!(file_count, 1);
-        assert!(files[0] >= 0);
-        assert_ne!(files[0], s1.as_raw_fd());
-        assert_ne!(files[0], s2.as_raw_fd());
-        assert_ne!(files[0], evt.as_raw_fd());
-
-        let mut file = unsafe { File::from_raw_fd(files[0]) };
-
-        file.write(unsafe { from_raw_parts(&1203u64 as *const u64 as *const u8, 8) })
-            .expect("failed to write to sent fd");
-
-        assert_eq!(evt.read().expect("failed to read from eventfd"), 1203);
-    }
-}

vhost_rs/src/vsock.rs

@@ -1,30 +0,0 @@
-// Copyright (C) 2019 Alibaba Cloud Computing. All rights reserved.
-// SPDX-License-Identifier: Apache-2.0 or BSD-3-Clause
-//
-// Portions Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
-//
-// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE-BSD file.
-
-//! Trait to control vhost-vsock backend drivers.
-
-use crate::backend::VhostBackend;
-use crate::Result;
-
-/// Trait to control vhost-vsock backend drivers.
-pub trait VhostVsock: VhostBackend {
-    /// Set the CID for the guest.
-    /// This number is used for routing all data destined for running in the guest.
-    /// Each guest on a hypervisor must have an unique CID.
-    ///
-    /// # Arguments
-    /// * `cid` - CID to assign to the guest
-    fn set_guest_cid(&mut self, cid: u64) -> Result<()>;
-
-    /// Tell the VHOST driver to start performing data transfer.
-    fn start(&mut self) -> Result<()>;
-
-    /// Tell the VHOST driver to stop performing data transfer.
-    fn stop(&mut self) -> Result<()>;
-}

vhost_user_backend/Cargo.toml

@@ -11,12 +11,10 @@ mmio_support = ["vm-virtio/mmio_support"]
 
 [dependencies]
 epoll = ">=4.0.1"
-libc = "0.2.66"
+libc = "0.2.68"
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+log = "0.4.8"
+virtio-bindings = "0.1.0"
+vm-memory = "0.1.0"
 vm-virtio = { path = "../vm-virtio" }
 vmm-sys-util = ">=0.3.1"
-
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", features = ["vhost-user-slave"] }
-[dependencies.vhost_rs]
-path = "../vhost_rs"
-features = ["vhost-user-slave"]
-

vhost_user_backend/src/lib.rs

@@ -4,6 +4,9 @@
 // Copyright 2019 Alibaba Cloud Computing. All rights reserved.
 // SPDX-License-Identifier: Apache-2.0
 
+#[macro_use]
+extern crate log;
+
 use std::error;
 use std::fs::File;
 use std::io;
@@ -17,8 +20,10 @@ use vhost_rs::vhost_user::message::{
     VhostUserVirtioFeatures, VhostUserVringAddrFlags, VhostUserVringState,
 };
 use vhost_rs::vhost_user::{
-    Error as VhostUserError, Result as VhostUserResult, SlaveListener, VhostUserSlaveReqHandler,
+    Error as VhostUserError, Result as VhostUserResult, SlaveFsCacheReq, SlaveListener,
+    VhostUserSlaveReqHandler,
 };
+use virtio_bindings::bindings::virtio_ring::VIRTIO_RING_F_EVENT_IDX;
 use vm_memory::guest_memory::FileOffset;
 use vm_memory::{GuestAddress, GuestMemoryMmap};
 use vm_virtio::Queue;
@@ -65,6 +70,9 @@ pub trait VhostUserBackend: Send + Sync + 'static {
     /// Virtio protocol features.
     fn protocol_features(&self) -> VhostUserProtocolFeatures;
 
+    /// Tell the backend if EVENT_IDX has been negotiated.
+    fn set_event_idx(&mut self, enabled: bool);
+
     /// Update guest memory regions.
     fn update_memory(&mut self, mem: GuestMemoryMmap) -> result::Result<(), io::Error>;
 
@@ -92,6 +100,19 @@ pub trait VhostUserBackend: Send + Sync + 'static {
     fn set_config(&mut self, _offset: u32, _buf: &[u8]) -> result::Result<(), io::Error> {
         Ok(())
     }
+
+    /// Provide an exit EventFd
+    /// When this EventFd is written to the worker thread will exit. An optional id may
+    /// also be provided, if it not provided then the exit event will be first event id
+    /// after the last queue
+    fn exit_event(&self) -> Option<(EventFd, Option<u16>)> {
+        None
+    }
+
+    /// Set slave fd.
+    /// A default implementation is provided as we cannot expect all backends
+    /// to implement this function.
+    fn set_slave_req_fd(&mut self, _vu_req: SlaveFsCacheReq) {}
 }
 
 /// This structure is the public API the backend is allowed to interact with
@@ -153,9 +174,14 @@ impl<S: VhostUserBackend> VhostUserDaemon<S> {
     /// terminate.
     pub fn wait(&mut self) -> Result<()> {
         if let Some(handle) = self.main_thread.take() {
-            let _ = handle.join().map_err(Error::WaitDaemon)?;
+            match handle.join().map_err(Error::WaitDaemon)? {
+                Ok(()) => Ok(()),
+                Err(Error::HandleRequest(VhostUserError::SocketBroken(_))) => Ok(()),
+                Err(e) => Err(e),
+            }
+        } else {
+            Ok(())
         }
-        Ok(())
     }
 
     /// Retrieve the vring worker. This is necessary to perform further
@@ -182,6 +208,8 @@ pub struct Vring {
     call: Option<EventFd>,
     err: Option<EventFd>,
     enabled: bool,
+    event_idx: bool,
+    signalled_used: Option<Wrapping<u16>>,
 }
 
 impl Vring {
@@ -192,6 +220,8 @@ impl Vring {
             call: None,
             err: None,
             enabled: false,
+            event_idx: false,
+            signalled_used: None,
         }
     }
 
@@ -199,12 +229,37 @@ impl Vring {
         &mut self.queue
     }
 
-    pub fn signal_used_queue(&self) -> result::Result<(), io::Error> {
+    pub fn set_event_idx(&mut self, enabled: bool) {
-        if let Some(call) = self.call.as_ref() {
+        /* Also reset the last signalled event */
-            return call.write(1);
+        self.signalled_used = None;
+        self.event_idx = enabled;
+    }
+
+    pub fn needs_notification(&mut self, mem: &GuestMemoryMmap, used_idx: Wrapping<u16>) -> bool {
+        if !self.event_idx {
+            return true;
         }
 
-        Ok(())
+        let mut notify = true;
+
+        if let Some(old_idx) = self.signalled_used {
+            if let Some(used_event) = self.mut_queue().get_used_event(&mem) {
+                if (used_idx - used_event - Wrapping(1u16)) >= (used_idx - old_idx) {
+                    notify = false;
+                }
+            }
+        }
+
+        self.signalled_used = Some(used_idx);
+        notify
+    }
+
+    pub fn signal_used_queue(&mut self) -> result::Result<(), io::Error> {
+        if let Some(call) = self.call.as_ref() {
+            call.write(1)
+        } else {
+            Ok(())
+        }
     }
 }
 
@@ -227,6 +282,7 @@ type VringEpollHandlerResult<T> = std::result::Result<T, VringEpollHandlerError>
 struct VringEpollHandler<S: VhostUserBackend> {
     backend: Arc<RwLock<S>>,
     vrings: Vec<Arc<RwLock<Vring>>>,
+    exit_event_id: Option<u16>,
 }
 
 impl<S: VhostUserBackend> VringEpollHandler<S> {
@@ -235,6 +291,10 @@ impl<S: VhostUserBackend> VringEpollHandler<S> {
         device_event: u16,
         evset: epoll::Events,
     ) -> VringEpollHandlerResult<bool> {
+        if self.exit_event_id == Some(device_event) {
+            return Ok(true);
+        }
+
         let num_queues = self.vrings.len();
         if (device_event as usize) < num_queues {
             if let Some(kick) = &self.vrings[device_event as usize].read().unwrap().kick {
@@ -262,6 +322,8 @@ impl<S: VhostUserBackend> VringEpollHandler<S> {
 enum VringWorkerError {
     /// Failed while waiting for events.
     EpollWait(io::Error),
+    /// Failed to handle the event.
+    HandleEvent(VringEpollHandlerError),
 }
 
 /// Result of vring worker operations.
@@ -306,11 +368,10 @@ impl VringWorker {
 
                 let ev_type = event.data as u16;
 
-                if let Err(e) = handler.handle_event(ev_type, evset) {
+                if handler
-                    println!(
+                    .handle_event(ev_type, evset)
-                        "vring handler handle event {} with error {:?}\n",
+                    .map_err(VringWorkerError::HandleEvent)?
-                        ev_type, e
+                {
-                    );
                     break 'epoll;
                 }
             }
@@ -366,6 +427,8 @@ pub enum VhostUserHandlerError {
     SpawnVringWorker(io::Error),
     /// Could not find the mapping from memory regions.
     MissingMemoryMapping,
+    /// Could not register exit event
+    RegisterExitEvent(io::Error),
 }
 
 impl std::fmt::Display for VhostUserHandlerError {
@@ -376,6 +439,9 @@ impl std::fmt::Display for VhostUserHandlerError {
                 write!(f, "failed spawning the vring worker: {}", e)
             }
             VhostUserHandlerError::MissingMemoryMapping => write!(f, "Missing memory mapping"),
+            VhostUserHandlerError::RegisterExitEvent(e) => {
+                write!(f, "Failed to register exit event: {}", e)
+            }
         }
     }
 }
@@ -396,6 +462,7 @@ struct VhostUserHandler<S: VhostUserBackend> {
     max_queue_size: usize,
     memory: Option<Memory>,
     vrings: Vec<Arc<RwLock<Vring>>>,
+    worker_thread: Option<thread::JoinHandle<VringWorkerResult<()>>>,
 }
 
 impl<S: VhostUserBackend> VhostUserHandler<S> {
@@ -412,17 +479,36 @@ impl<S: VhostUserBackend> VhostUserHandler<S> {
         // Create the epoll file descriptor
         let epoll_fd = epoll::create(true).map_err(VhostUserHandlerError::EpollCreateFd)?;
 
-        let vring_handler = VringEpollHandler {
-            backend: backend.clone(),
-            vrings: vrings.clone(),
-        };
         let vring_worker = Arc::new(VringWorker { epoll_fd });
         let worker = vring_worker.clone();
 
-        thread::Builder::new()
+        let exit_event_id =
-            .name("vring_worker".to_string())
+            if let Some((exit_event_fd, exit_event_id)) = backend.read().unwrap().exit_event() {
-            .spawn(move || vring_worker.run(vring_handler))
+                let exit_event_id = exit_event_id.unwrap_or(num_queues as u16);
-            .map_err(VhostUserHandlerError::SpawnVringWorker)?;
+                worker
+                    .register_listener(
+                        exit_event_fd.as_raw_fd(),
+                        epoll::Events::EPOLLIN,
+                        u64::from(exit_event_id),
+                    )
+                    .map_err(VhostUserHandlerError::RegisterExitEvent)?;
+                Some(exit_event_id)
+            } else {
+                None
+            };
+
+        let vring_handler = VringEpollHandler {
+            backend: backend.clone(),
+            vrings: vrings.clone(),
+            exit_event_id,
+        };
+
+        let worker_thread = Some(
+            thread::Builder::new()
+                .name("vring_worker".to_string())
+                .spawn(move || vring_worker.run(vring_handler))
+                .map_err(VhostUserHandlerError::SpawnVringWorker)?,
+        );
 
         Ok(VhostUserHandler {
             backend,
@@ -435,6 +521,7 @@ impl<S: VhostUserBackend> VhostUserHandler<S> {
             max_queue_size,
             memory: None,
             vrings,
+            worker_thread,
         })
     }
 
@@ -536,7 +623,7 @@ impl<S: VhostUserBackend> VhostUserSlaveReqHandler for VhostUserHandler<S> {
             });
         }
 
-        let mem = GuestMemoryMmap::with_files(regions).map_err(|e| {
+        let mem = GuestMemoryMmap::from_ranges_with_files(regions).map_err(|e| {
             VhostUserError::ReqHandlerError(io::Error::new(io::ErrorKind::Other, e))
         })?;
         self.backend
@@ -610,6 +697,13 @@ impl<S: VhostUserBackend> VhostUserSlaveReqHandler for VhostUserHandler<S> {
             .queue
             .next_avail = Wrapping(base as u16);
         self.vrings[index as usize].write().unwrap().queue.next_used = Wrapping(base as u16);
+
+        let event_idx: bool = (self.acked_features & (1 << VIRTIO_RING_F_EVENT_IDX)) != 0;
+        self.vrings[index as usize]
+            .write()
+            .unwrap()
+            .set_event_idx(event_idx);
+        self.backend.write().unwrap().set_event_idx(event_idx);
         Ok(())
     }
 
@@ -735,4 +829,18 @@ impl<S: VhostUserBackend> VhostUserSlaveReqHandler for VhostUserHandler<S> {
             .set_config(offset, buf)
             .map_err(VhostUserError::ReqHandlerError)
     }
+
+    fn set_slave_req_fd(&mut self, vu_req: SlaveFsCacheReq) {
+        self.backend.write().unwrap().set_slave_req_fd(vu_req);
+    }
+}
+
+impl<S: VhostUserBackend> Drop for VhostUserHandler<S> {
+    fn drop(&mut self) {
+        if let Some(thread) = self.worker_thread.take() {
+            if let Err(e) = thread.join() {
+                error!("Error in vring worker: {:?}", e);
+            }
+        }
+    }
 }

vhost_user_block/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "vhost_user_block"
+version = "0.1.0"
+authors = ["The Cloud Hypervisor Authors"]
+edition = "2018"
+
+[dependencies]
+bitflags = "1.1.0"
+epoll = ">=4.0.1"
+libc = "0.2.68"
+log = "0.4.8"
+qcow = { path = "../qcow" }
+vhost_user_backend = { path = "../vhost_user_backend" }
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", features = ["vhost-user-slave"] }
+virtio-bindings = "0.1.0"
+vm-memory = "0.1.0"
+vm-virtio = { path = "../vm-virtio" }
+vmm-sys-util = ">=0.3.1"

vhost_user_block/src/lib.rs

@@ -0,0 +1,450 @@
+// Copyright 2019 Red Hat, Inc. All Rights Reserved.
+//
+// Portions Copyright 2019 Intel Corporation. All Rights Reserved.
+//
+// Portions Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+//
+// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
+//
+// SPDX-License-Identifier: (Apache-2.0 AND BSD-3-Clause)
+
+extern crate log;
+extern crate vhost_rs;
+extern crate vhost_user_backend;
+extern crate vm_virtio;
+
+use epoll;
+use libc::EFD_NONBLOCK;
+use log::*;
+use qcow::{self, ImageType, QcowFile};
+use std::fs::File;
+use std::fs::OpenOptions;
+use std::io::Read;
+use std::io::{Seek, SeekFrom, Write};
+use std::mem;
+use std::num::Wrapping;
+use std::os::unix::fs::OpenOptionsExt;
+use std::path::PathBuf;
+use std::process;
+use std::slice;
+use std::sync::{Arc, RwLock};
+use std::time::Instant;
+use std::vec::Vec;
+use std::{convert, error, fmt, io};
+use vhost_rs::vhost_user::message::*;
+use vhost_user_backend::{VhostUserBackend, VhostUserDaemon, Vring, VringWorker};
+use virtio_bindings::bindings::virtio_blk::*;
+use virtio_bindings::bindings::virtio_ring::VIRTIO_RING_F_EVENT_IDX;
+use vm_memory::{Bytes, GuestMemoryError, GuestMemoryMmap};
+use vm_virtio::block::{build_disk_image_id, Request};
+use vmm_sys_util::eventfd::EventFd;
+
+const QUEUE_SIZE: usize = 1024;
+const SECTOR_SHIFT: u8 = 9;
+const SECTOR_SIZE: u64 = (0x01 as u64) << SECTOR_SHIFT;
+const BLK_SIZE: u32 = 512;
+// Current (2020) enterprise SSDs have a latency lower than 30us.
+// Polling for 50us should be enough to cover for the device latency
+// and the overhead of the emulation layer.
+const POLL_QUEUE_US: u128 = 50;
+
+trait DiskFile: Read + Seek + Write + Send + Sync {}
+impl<D: Read + Seek + Write + Send + Sync> DiskFile for D {}
+
+pub type Result<T> = std::result::Result<T, Error>;
+pub type VhostUserBackendResult<T> = std::result::Result<T, std::io::Error>;
+
+#[derive(Debug)]
+pub enum Error {
+    /// Failed to detect image type.
+    DetectImageType,
+    /// Bad memory address.
+    GuestMemory(GuestMemoryError),
+    /// Can't open image file.
+    OpenImage,
+    /// Failed to parse direct parameter.
+    ParseDirectParam,
+    /// Failed to parse image parameter.
+    ParseImageParam,
+    /// Failed to parse sock parameter.
+    ParseSockParam,
+    /// Failed to parse readonly parameter.
+    ParseReadOnlyParam,
+    /// Failed parsing fs number of queues parameter.
+    ParseBlkNumQueuesParam(std::num::ParseIntError),
+    /// Failed to parse the poll_queue parameter.
+    ParsePollQueueParam,
+    /// Failed to handle event other than input event.
+    HandleEventNotEpollIn,
+    /// Failed to create kill eventfd
+    CreateKillEventFd(io::Error),
+    /// Failed to handle unknown event.
+    HandleEventUnknownEvent,
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "vhost_user_block_error: {:?}", self)
+    }
+}
+
+impl error::Error for Error {}
+
+impl convert::From<Error> for io::Error {
+    fn from(e: Error) -> Self {
+        io::Error::new(io::ErrorKind::Other, e)
+    }
+}
+
+pub struct VhostUserBlkBackend {
+    mem: Option<GuestMemoryMmap>,
+    vring_worker: Option<Arc<VringWorker>>,
+    disk_image: Box<dyn DiskFile>,
+    disk_image_id: Vec<u8>,
+    disk_nsectors: u64,
+    config: virtio_blk_config,
+    rdonly: bool,
+    poll_queue: bool,
+    event_idx: bool,
+    kill_evt: EventFd,
+}
+
+impl VhostUserBlkBackend {
+    pub fn new(
+        image_path: String,
+        num_queues: usize,
+        rdonly: bool,
+        direct: bool,
+        poll_queue: bool,
+    ) -> Result<Self> {
+        let mut options = OpenOptions::new();
+        options.read(true);
+        options.write(!rdonly);
+        if direct {
+            options.custom_flags(libc::O_DIRECT);
+        }
+        let image: File = options.open(&image_path).unwrap();
+        let mut raw_img: vm_virtio::RawFile = vm_virtio::RawFile::new(image, direct);
+
+        let image_id = build_disk_image_id(&PathBuf::from(&image_path));
+        let image_type = qcow::detect_image_type(&mut raw_img).unwrap();
+        let mut image = match image_type {
+            ImageType::Raw => Box::new(raw_img) as Box<dyn DiskFile>,
+            ImageType::Qcow2 => Box::new(QcowFile::from(raw_img).unwrap()) as Box<dyn DiskFile>,
+        };
+
+        let nsectors = (image.seek(SeekFrom::End(0)).unwrap() as u64) / SECTOR_SIZE;
+        let mut config = virtio_blk_config::default();
+
+        config.capacity = nsectors;
+        config.blk_size = BLK_SIZE;
+        config.size_max = 65535;
+        config.seg_max = 128 - 2;
+        config.min_io_size = 1;
+        config.opt_io_size = 1;
+        config.num_queues = num_queues as u16;
+        config.wce = 1;
+
+        Ok(VhostUserBlkBackend {
+            mem: None,
+            vring_worker: None,
+            disk_image: image,
+            disk_image_id: image_id,
+            disk_nsectors: nsectors,
+            config,
+            rdonly,
+            poll_queue,
+            event_idx: false,
+            kill_evt: EventFd::new(EFD_NONBLOCK).map_err(Error::CreateKillEventFd)?,
+        })
+    }
+
+    pub fn process_queue(&mut self, vring: &mut Vring) -> bool {
+        let mut used_any = false;
+        let mem = match self.mem.as_ref() {
+            Some(m) => m,
+            None => return false,
+        };
+
+        while let Some(head) = vring.mut_queue().iter(mem).next() {
+            debug!("got an element in the queue");
+            let len;
+            match Request::parse(&head, mem) {
+                Ok(request) => {
+                    debug!("element is a valid request");
+                    let status = match request.execute(
+                        &mut self.disk_image,
+                        self.disk_nsectors,
+                        mem,
+                        &self.disk_image_id,
+                    ) {
+                        Ok(l) => {
+                            len = l;
+                            VIRTIO_BLK_S_OK
+                        }
+                        Err(e) => {
+                            len = 1;
+                            e.status()
+                        }
+                    };
+                    mem.write_obj(status, request.status_addr).unwrap();
+                }
+                Err(err) => {
+                    error!("failed to parse available descriptor chain: {:?}", err);
+                    len = 0;
+                }
+            }
+
+            if self.event_idx {
+                if let Some(used_idx) = vring.mut_queue().add_used(mem, head.index, len) {
+                    if vring.needs_notification(&mem, Wrapping(used_idx)) {
+                        debug!("signalling queue");
+                        vring.signal_used_queue().unwrap();
+                    } else {
+                        debug!("omitting signal (event_idx)");
+                    }
+                    used_any = true;
+                }
+            } else {
+                debug!("signalling queue");
+                vring.mut_queue().add_used(mem, head.index, len);
+                vring.signal_used_queue().unwrap();
+                used_any = true;
+            }
+        }
+
+        used_any
+    }
+
+    pub fn set_vring_worker(&mut self, vring_worker: Option<Arc<VringWorker>>) {
+        self.vring_worker = vring_worker;
+    }
+}
+
+impl VhostUserBackend for VhostUserBlkBackend {
+    fn num_queues(&self) -> usize {
+        self.config.num_queues as usize
+    }
+
+    fn max_queue_size(&self) -> usize {
+        QUEUE_SIZE
+    }
+
+    fn features(&self) -> u64 {
+        let mut avail_features = 1 << VIRTIO_BLK_F_MQ
+            | 1 << VIRTIO_BLK_F_CONFIG_WCE
+            | 1 << VIRTIO_RING_F_EVENT_IDX
+            | 1 << VIRTIO_F_VERSION_1
+            | VhostUserVirtioFeatures::PROTOCOL_FEATURES.bits();
+
+        if self.rdonly {
+            avail_features |= 1 << VIRTIO_BLK_F_RO;
+        }
+        avail_features
+    }
+
+    fn protocol_features(&self) -> VhostUserProtocolFeatures {
+        VhostUserProtocolFeatures::CONFIG
+    }
+
+    fn set_event_idx(&mut self, enabled: bool) {
+        self.event_idx = enabled;
+    }
+
+    fn update_memory(&mut self, mem: GuestMemoryMmap) -> VhostUserBackendResult<()> {
+        self.mem = Some(mem);
+        Ok(())
+    }
+
+    fn handle_event(
+        &mut self,
+        device_event: u16,
+        evset: epoll::Events,
+        vrings: &[Arc<RwLock<Vring>>],
+    ) -> VhostUserBackendResult<bool> {
+        if evset != epoll::Events::EPOLLIN {
+            return Err(Error::HandleEventNotEpollIn.into());
+        }
+
+        debug!("event received: {:?}", device_event);
+
+        match device_event {
+            q if device_event < self.config.num_queues => {
+                let mut vring = vrings[q as usize].write().unwrap();
+
+                if self.poll_queue {
+                    // Actively poll the queue until POLL_QUEUE_US has passed
+                    // without seeing a new request.
+                    let mut now = Instant::now();
+                    loop {
+                        if self.process_queue(&mut vring) {
+                            now = Instant::now();
+                        } else if now.elapsed().as_micros() > POLL_QUEUE_US {
+                            break;
+                        }
+                    }
+                }
+
+                if self.event_idx {
+                    // vm-virtio's Queue implementation only checks avail_index
+                    // once, so to properly support EVENT_IDX we need to keep
+                    // calling process_queue() until it stops finding new
+                    // requests on the queue.
+                    loop {
+                        vring
+                            .mut_queue()
+                            .update_avail_event(self.mem.as_ref().unwrap());
+                        if !self.process_queue(&mut vring) {
+                            break;
+                        }
+                    }
+                } else {
+                    // Without EVENT_IDX, a single call is enough.
+                    self.process_queue(&mut vring);
+                }
+
+                Ok(false)
+            }
+            _ => Err(Error::HandleEventUnknownEvent.into()),
+        }
+    }
+
+    fn get_config(&self, _offset: u32, _size: u32) -> Vec<u8> {
+        // self.config is a statically allocated virtio_blk_config
+        let buf = unsafe {
+            slice::from_raw_parts(
+                &self.config as *const virtio_blk_config as *const _,
+                mem::size_of::<virtio_blk_config>(),
+            )
+        };
+
+        buf.to_vec()
+    }
+
+    fn exit_event(&self) -> Option<(EventFd, Option<u16>)> {
+        Some((self.kill_evt.try_clone().unwrap(), None))
+    }
+}
+
+pub struct VhostUserBlkBackendConfig<'a> {
+    pub image: &'a str,
+    pub sock: &'a str,
+    pub num_queues: usize,
+    pub readonly: bool,
+    pub direct: bool,
+    pub poll_queue: bool,
+}
+
+impl<'a> VhostUserBlkBackendConfig<'a> {
+    pub fn parse(backend: &'a str) -> Result<Self> {
+        let params_list: Vec<&str> = backend.split(',').collect();
+
+        let mut image: &str = "";
+        let mut sock: &str = "";
+        let mut num_queues_str: &str = "";
+        let mut readonly: bool = false;
+        let mut direct: bool = false;
+        let mut poll_queue: bool = true;
+
+        for param in params_list.iter() {
+            if param.starts_with("image=") {
+                image = &param[6..];
+            } else if param.starts_with("sock=") {
+                sock = &param[5..];
+            } else if param.starts_with("num_queues=") {
+                num_queues_str = &param[11..];
+            } else if param.starts_with("readonly=") {
+                readonly = match param[9..].parse::<bool>() {
+                    Ok(b) => b,
+                    Err(_) => return Err(Error::ParseReadOnlyParam),
+                }
+            } else if param.starts_with("direct=") {
+                direct = match param[7..].parse::<bool>() {
+                    Ok(b) => b,
+                    Err(_) => return Err(Error::ParseDirectParam),
+                }
+            } else if param.starts_with("poll_queue=") {
+                poll_queue = match param[11..].parse::<bool>() {
+                    Ok(b) => b,
+                    Err(_) => return Err(Error::ParsePollQueueParam),
+                }
+            }
+        }
+
+        let mut num_queues: usize = 1;
+        if image.is_empty() {
+            return Err(Error::ParseImageParam);
+        }
+        if sock.is_empty() {
+            return Err(Error::ParseSockParam);
+        }
+        if !num_queues_str.is_empty() {
+            num_queues = num_queues_str
+                .parse()
+                .map_err(Error::ParseBlkNumQueuesParam)?;
+        }
+        Ok(VhostUserBlkBackendConfig {
+            image,
+            sock,
+            num_queues,
+            readonly,
+            direct,
+            poll_queue,
+        })
+    }
+}
+
+pub fn start_block_backend(backend_command: &str) {
+    let backend_config = match VhostUserBlkBackendConfig::parse(backend_command) {
+        Ok(config) => config,
+        Err(e) => {
+            println!("Failed parsing parameters {:?}", e);
+            process::exit(1);
+        }
+    };
+
+    let blk_backend = Arc::new(RwLock::new(
+        VhostUserBlkBackend::new(
+            backend_config.image.to_string(),
+            backend_config.num_queues,
+            backend_config.readonly,
+            backend_config.direct,
+            backend_config.poll_queue,
+        )
+        .unwrap(),
+    ));
+
+    debug!("blk_backend is created!\n");
+
+    let name = "vhost-user-blk-backend";
+    let mut blk_daemon = VhostUserDaemon::new(
+        name.to_string(),
+        backend_config.sock.to_string(),
+        blk_backend.clone(),
+    )
+    .unwrap();
+    debug!("blk_daemon is created!\n");
+
+    let vring_worker = blk_daemon.get_vring_worker();
+    blk_backend
+        .write()
+        .unwrap()
+        .set_vring_worker(Some(vring_worker));
+
+    if let Err(e) = blk_daemon.start() {
+        error!(
+            "Failed to start daemon for vhost-user-block with error: {:?}\n",
+            e
+        );
+        process::exit(1);
+    }
+
+    if let Err(e) = blk_daemon.wait() {
+        error!("Error from the main thread: {:?}", e);
+    }
+
+    let kill_evt = &blk_backend.write().unwrap().kill_evt;
+    if let Err(e) = kill_evt.write(1) {
+        error!("Error shutting down worker thread: {:?}", e)
+    }
+}

vhost_user_fs/Cargo.toml

@@ -6,7 +6,8 @@ edition = "2018"
 
 [dependencies]
 bitflags = "1.1.0"
-libc = "0.2.65"
+libc = "0.2.68"
 log = "0.4.8"
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+vm-memory = "0.1.0"
 vm-virtio = { path = "../vm-virtio" }
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", features = ["vhost-user-slave"] }

vhost_user_fs/src/descriptor_utils.rs

@@ -15,6 +15,7 @@ use vm_memory::{
     Address, ByteValued, Bytes, GuestAddress, GuestMemory, GuestMemoryError, GuestMemoryMmap,
     GuestMemoryRegion, Le16, Le32, Le64, VolatileMemory, VolatileMemoryError, VolatileSlice,
 };
+use vm_virtio::queue::Error as QueueError;
 use vm_virtio::DescriptorChain;
 
 use crate::file_traits::{FileReadWriteAtVolatile, FileReadWriteVolatile};
@@ -25,6 +26,7 @@ pub enum Error {
     FindMemoryRegion,
     GuestMemoryError(GuestMemoryError),
     InvalidChain,
+    ConvertIndirectDescriptor(QueueError),
     IoError(io::Error),
     SplitOutOfBounds(usize),
     VolatileMemoryError(VolatileMemoryError),
@@ -35,6 +37,7 @@ impl Display for Error {
         use self::Error::*;
 
         match self {
+            ConvertIndirectDescriptor(e) => write!(f, "invalid indirect descriptor: {}", e),
             DescriptorChainOverflow => write!(
                 f,
                 "the combined length of all the buffers in a `DescriptorChain` would overflow"
@@ -191,7 +194,14 @@ impl<'a> Reader<'a> {
     /// Construct a new Reader wrapper over `desc_chain`.
     pub fn new(mem: &'a GuestMemoryMmap, desc_chain: DescriptorChain<'a>) -> Result<Reader<'a>> {
         let mut total_len: usize = 0;
-        let buffers = desc_chain
+        let chain = if desc_chain.is_indirect() {
+            desc_chain
+                .new_from_indirect()
+                .map_err(Error::ConvertIndirectDescriptor)?
+        } else {
+            desc_chain
+        };
+        let buffers = chain
             .into_iter()
             .readable()
             .map(|desc| {
@@ -343,7 +353,14 @@ impl<'a> Writer<'a> {
     /// Construct a new Writer wrapper over `desc_chain`.
     pub fn new(mem: &'a GuestMemoryMmap, desc_chain: DescriptorChain<'a>) -> Result<Writer<'a>> {
         let mut total_len: usize = 0;
-        let buffers = desc_chain
+        let chain = if desc_chain.is_indirect() {
+            desc_chain
+                .new_from_indirect()
+                .map_err(Error::ConvertIndirectDescriptor)?
+        } else {
+            desc_chain
+        };
+        let buffers = chain
             .into_iter()
             .writable()
             .map(|desc| {
@@ -546,7 +563,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -587,7 +604,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -628,7 +645,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -653,7 +670,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -678,7 +695,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -726,7 +743,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let secret: Le32 = 0x12345678.into();
 
@@ -765,7 +782,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -795,7 +812,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -824,7 +841,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -853,7 +870,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -882,7 +899,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -911,7 +928,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -940,7 +957,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,
@@ -964,7 +981,7 @@ mod tests {
         use DescriptorType::*;
 
         let memory_start_addr = GuestAddress(0x0);
-        let memory = GuestMemoryMmap::new(&vec![(memory_start_addr, 0x10000)]).unwrap();
+        let memory = GuestMemoryMmap::from_ranges(&vec![(memory_start_addr, 0x10000)]).unwrap();
 
         let chain = create_descriptor_chain(
             &memory,

vhost_user_fs/src/filesystem.rs

@@ -13,8 +13,10 @@ use libc;
 
 use crate::fuse;
 
+use super::fs_cache_req_handler::FsCacheReqHandler;
 pub use fuse::FsOptions;
 pub use fuse::OpenOptions;
+pub use fuse::RemovemappingOne;
 pub use fuse::SetattrValid;
 pub use fuse::ROOT_ID;
 
@@ -1043,6 +1045,31 @@ pub trait FileSystem {
         Err(io::Error::from_raw_os_error(libc::ENOSYS))
     }
 
+    /// Setup a mapping so that guest can access files in DAX style.
+    #[allow(clippy::too_many_arguments)]
+    fn setupmapping<T: FsCacheReqHandler>(
+        &self,
+        _ctx: Context,
+        inode: Self::Inode,
+        handle: Self::Handle,
+        foffset: u64,
+        len: u64,
+        flags: u64,
+        moffset: u64,
+        vu_req: &mut T,
+    ) -> io::Result<()> {
+        Err(io::Error::from_raw_os_error(libc::ENOSYS))
+    }
+
+    fn removemapping<T: FsCacheReqHandler>(
+        &self,
+        _ctx: Context,
+        requests: Vec<RemovemappingOne>,
+        vu_req: &mut T,
+    ) -> io::Result<()> {
+        Err(io::Error::from_raw_os_error(libc::ENOSYS))
+    }
+
     /// Check file access permissions.
     ///
     /// This method is called when a userspace process in the client makes an `access()` or
@@ -1057,6 +1084,18 @@ pub trait FileSystem {
         Err(io::Error::from_raw_os_error(libc::ENOSYS))
     }
 
+    /// Reposition read/write file offset.
+    fn lseek(
+        &self,
+        ctx: Context,
+        inode: Self::Inode,
+        handle: Self::Handle,
+        offset: u64,
+        whence: u32,
+    ) -> io::Result<u64> {
+        Err(io::Error::from_raw_os_error(libc::ENOSYS))
+    }
+
     /// TODO: support this
     fn getlk(&self) -> io::Result<()> {
         Err(io::Error::from_raw_os_error(libc::ENOSYS))
@@ -1091,9 +1130,4 @@ pub trait FileSystem {
     fn notify_reply(&self) -> io::Result<()> {
         Err(io::Error::from_raw_os_error(libc::ENOSYS))
     }
-
-    /// TODO: support this
-    fn lseek(&self) -> io::Result<()> {
-        Err(io::Error::from_raw_os_error(libc::ENOSYS))
-    }
 }

vhost_user_fs/src/fs_cache_req_handler.rs

@@ -0,0 +1,61 @@
+use crate::fuse;
+use std::io;
+use std::os::unix::io::RawFd;
+use vhost_rs::vhost_user::message::{
+    VhostUserFSSlaveMsg, VhostUserFSSlaveMsgFlags, VHOST_USER_FS_SLAVE_ENTRIES,
+};
+use vhost_rs::vhost_user::{SlaveFsCacheReq, VhostUserMasterReqHandler};
+
+/// Trait for virtio-fs cache requests operations.  This is mainly used to hide
+/// vhost-user details from virtio-fs's fuse part.
+pub trait FsCacheReqHandler: Send + Sync + 'static {
+    /// Setup a dedicated mapping so that guest can access file data in DAX style.
+    fn map(
+        &mut self,
+        foffset: u64,
+        moffset: u64,
+        len: u64,
+        flags: u64,
+        fd: RawFd,
+    ) -> io::Result<()>;
+
+    /// Remove those mappings that provide the access to file data.
+    fn unmap(&mut self, requests: Vec<fuse::RemovemappingOne>) -> io::Result<()>;
+}
+
+impl FsCacheReqHandler for SlaveFsCacheReq {
+    fn map(
+        &mut self,
+        foffset: u64,
+        moffset: u64,
+        len: u64,
+        flags: u64,
+        fd: RawFd,
+    ) -> io::Result<()> {
+        let mut msg: VhostUserFSSlaveMsg = Default::default();
+        msg.fd_offset[0] = foffset;
+        msg.cache_offset[0] = moffset;
+        msg.len[0] = len;
+        msg.flags[0] = if (flags & fuse::SetupmappingFlags::WRITE.bits()) != 0 {
+            VhostUserFSSlaveMsgFlags::MAP_W | VhostUserFSSlaveMsgFlags::MAP_R
+        } else {
+            VhostUserFSSlaveMsgFlags::MAP_R
+        };
+
+        self.fs_slave_map(&msg, fd)
+    }
+
+    fn unmap(&mut self, requests: Vec<fuse::RemovemappingOne>) -> io::Result<()> {
+        for chunk in requests.chunks(VHOST_USER_FS_SLAVE_ENTRIES) {
+            let mut msg: VhostUserFSSlaveMsg = Default::default();
+
+            for (ind, req) in chunk.iter().enumerate() {
+                msg.len[ind] = req.len;
+                msg.cache_offset[ind] = req.moffset;
+            }
+
+            self.fs_slave_unmap(&msg)?;
+        }
+        Ok(())
+    }
+}

vhost_user_fs/src/fuse.rs

@@ -513,6 +513,9 @@ pub enum Opcode {
     Readdirplus = 44,
     Rename2 = 45,
     Lseek = 46,
+    CopyFileRange = 47,
+    SetupMapping = 48,
+    RemoveMapping = 49,
 }
 
 #[repr(u32)]
@@ -1045,3 +1048,39 @@ pub struct LseekOut {
     pub offset: u64,
 }
 unsafe impl ByteValued for LseekOut {}
+
+bitflags! {
+    pub struct SetupmappingFlags: u64 {
+    const WRITE = 0x1;
+    const READ = 0x2;
+    }
+}
+
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct SetupmappingIn {
+    pub fh: u64,
+    pub foffset: u64,
+    pub len: u64,
+    pub flags: u64,
+    pub moffset: u64,
+}
+
+unsafe impl ByteValued for SetupmappingIn {}
+
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct RemovemappingIn {
+    pub count: u32,
+}
+
+unsafe impl ByteValued for RemovemappingIn {}
+
+#[repr(C)]
+#[derive(Debug, Default, Copy, Clone)]
+pub struct RemovemappingOne {
+    pub moffset: u64,
+    pub len: u64,
+}
+
+unsafe impl ByteValued for RemovemappingOne {}

vhost_user_fs/src/lib.rs

@@ -8,6 +8,7 @@ extern crate log;
 pub mod descriptor_utils;
 pub mod file_traits;
 pub mod filesystem;
+pub mod fs_cache_req_handler;
 pub mod fuse;
 pub mod multikey;
 pub mod passthrough;

vhost_user_fs/src/passthrough.rs

@@ -11,12 +11,13 @@ use std::mem::{self, size_of, MaybeUninit};
 use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
 use std::str::FromStr;
 use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
-use std::sync::{Arc, Mutex, RwLock};
+use std::sync::{Arc, RwLock};
 use std::time::Duration;
 
 use libc;
 use vm_memory::ByteValued;
 
+use super::fs_cache_req_handler::FsCacheReqHandler;
 use crate::filesystem::{
     Context, DirEntry, Entry, FileSystem, FsOptions, GetxattrReply, ListxattrReply, OpenOptions,
     SetattrValid, ZeroCopyReader, ZeroCopyWriter,
@@ -47,7 +48,7 @@ struct InodeData {
 
 struct HandleData {
     inode: Inode,
-    file: Mutex<File>,
+    file: RwLock<File>,
 }
 
 #[repr(C, packed)]
@@ -230,6 +231,13 @@ pub struct Config {
     ///
     /// The default is `/`.
     pub root_dir: String,
+
+    /// Whether the file system should support Extended Attributes (xattr). Enabling this feature may
+    /// have a significant impact on performance, especially on write parallelism. This is the result
+    /// of FUSE attempting to remove the special file privileges after each write request.
+    ///
+    /// The default value for this options is `false`.
+    pub xattr: bool,
 }
 
 impl Default for Config {
@@ -240,6 +248,7 @@ impl Default for Config {
             cache_policy: Default::default(),
             writeback: false,
             root_dir: String::from("/"),
+            xattr: false,
         }
     }
 }
@@ -459,7 +468,7 @@ impl PassthroughFs {
             // Since we are going to work with the kernel offset, we have to acquire the file lock
             // for both the `lseek64` and `getdents64` syscalls to ensure that no other thread
             // changes the kernel offset while we are using it.
-            let dir = data.file.lock().unwrap();
+            let dir = data.file.write().unwrap();
 
             // Safe because this doesn't modify any memory and we check the return value.
             let res =
@@ -534,7 +543,7 @@ impl PassthroughFs {
     }
 
     fn do_open(&self, inode: Inode, flags: u32) -> io::Result<(Option<Handle>, OpenOptions)> {
-        let file = Mutex::new(self.open_inode(inode, flags as i32)?);
+        let file = RwLock::new(self.open_inode(inode, flags as i32)?);
 
         let handle = self.next_handle.fetch_add(1, Ordering::Relaxed);
         let data = HandleData { inode, file };
@@ -885,7 +894,7 @@ impl FileSystem for PassthroughFs {
         }
 
         // Safe because we just opened this fd.
-        let file = Mutex::new(unsafe { File::from_raw_fd(fd) });
+        let file = RwLock::new(unsafe { File::from_raw_fd(fd) });
 
         let entry = self.do_lookup(parent, name)?;
 
@@ -911,6 +920,41 @@ impl FileSystem for PassthroughFs {
         self.do_unlink(parent, name, 0)
     }
 
+    fn setupmapping<T: FsCacheReqHandler>(
+        &self,
+        _ctx: Context,
+        inode: Inode,
+        _handle: Handle,
+        foffset: u64,
+        len: u64,
+        flags: u64,
+        moffset: u64,
+        vu_req: &mut T,
+    ) -> io::Result<()> {
+        debug!(
+            "setupmapping: ino {:?} foffset {} len {} flags {} moffset {}",
+            inode, foffset, len, flags, moffset
+        );
+
+        let open_flags = if (flags & fuse::SetupmappingFlags::WRITE.bits()) != 0 {
+            libc::O_RDWR
+        } else {
+            libc::O_RDONLY
+        };
+
+        let file = self.open_inode(inode, open_flags as i32)?;
+        (*vu_req).map(foffset, moffset, len, flags, file.as_raw_fd())
+    }
+
+    fn removemapping<T: FsCacheReqHandler>(
+        &self,
+        _ctx: Context,
+        requests: Vec<fuse::RemovemappingOne>,
+        vu_req: &mut T,
+    ) -> io::Result<()> {
+        (*vu_req).unmap(requests)
+    }
+
     fn read<W: io::Write + ZeroCopyWriter>(
         &self,
         _ctx: Context,
@@ -931,7 +975,9 @@ impl FileSystem for PassthroughFs {
             .map(Arc::clone)
             .ok_or_else(ebadf)?;
 
-        let mut f = data.file.lock().unwrap();
+        // This is safe because write_from uses preadv64, so the underlying file descriptor
+        // offset is not affected by this operation.
+        let mut f = data.file.read().unwrap().try_clone().unwrap();
         w.write_from(&mut f, size as usize, offset)
     }
 
@@ -959,7 +1005,9 @@ impl FileSystem for PassthroughFs {
             .map(Arc::clone)
             .ok_or_else(ebadf)?;
 
-        let mut f = data.file.lock().unwrap();
+        // This is safe because read_to uses pwritev64, so the underlying file descriptor
+        // offset is not affected by this operation.
+        let mut f = data.file.read().unwrap().try_clone().unwrap();
         r.read_to(&mut f, size as usize, offset)
     }
 
@@ -1004,7 +1052,7 @@ impl FileSystem for PassthroughFs {
                 .map(Arc::clone)
                 .ok_or_else(ebadf)?;
 
-            let fd = hd.file.lock().unwrap().as_raw_fd();
+            let fd = hd.file.write().unwrap().as_raw_fd();
             Data::Handle(hd, fd)
         } else {
             let pathname = CString::new(format!("self/fd/{}", inode_data.file.as_raw_fd()))
@@ -1313,7 +1361,7 @@ impl FileSystem for PassthroughFs {
         // behavior by doing the same thing (dup-ing the fd and then immediately closing it). Safe
         // because this doesn't modify any memory and we check the return values.
         unsafe {
-            let newfd = libc::dup(data.file.lock().unwrap().as_raw_fd());
+            let newfd = libc::dup(data.file.write().unwrap().as_raw_fd());
             if newfd < 0 {
                 return Err(io::Error::last_os_error());
             }
@@ -1336,7 +1384,7 @@ impl FileSystem for PassthroughFs {
             .map(Arc::clone)
             .ok_or_else(ebadf)?;
 
-        let fd = data.file.lock().unwrap().as_raw_fd();
+        let fd = data.file.write().unwrap().as_raw_fd();
 
         // Safe because this doesn't modify any memory and we check the return value.
         let res = unsafe {
@@ -1421,6 +1469,10 @@ impl FileSystem for PassthroughFs {
         value: &[u8],
         flags: u32,
     ) -> io::Result<()> {
+        if !self.cfg.xattr {
+            return Err(io::Error::from_raw_os_error(libc::ENOSYS));
+        }
+
         // The f{set,get,remove,list}xattr functions don't work on an fd opened with `O_PATH` so we
         // need to get a new fd.
         let file = self.open_inode(inode, libc::O_RDONLY | libc::O_NONBLOCK)?;
@@ -1449,6 +1501,10 @@ impl FileSystem for PassthroughFs {
         name: &CStr,
         size: u32,
     ) -> io::Result<GetxattrReply> {
+        if !self.cfg.xattr {
+            return Err(io::Error::from_raw_os_error(libc::ENOSYS));
+        }
+
         // The f{set,get,remove,list}xattr functions don't work on an fd opened with `O_PATH` so we
         // need to get a new fd.
         let file = self.open_inode(inode, libc::O_RDONLY | libc::O_NONBLOCK)?;
@@ -1477,6 +1533,10 @@ impl FileSystem for PassthroughFs {
     }
 
     fn listxattr(&self, _ctx: Context, inode: Inode, size: u32) -> io::Result<ListxattrReply> {
+        if !self.cfg.xattr {
+            return Err(io::Error::from_raw_os_error(libc::ENOSYS));
+        }
+
         // The f{set,get,remove,list}xattr functions don't work on an fd opened with `O_PATH` so we
         // need to get a new fd.
         let file = self.open_inode(inode, libc::O_RDONLY | libc::O_NONBLOCK)?;
@@ -1504,6 +1564,10 @@ impl FileSystem for PassthroughFs {
     }
 
     fn removexattr(&self, _ctx: Context, inode: Inode, name: &CStr) -> io::Result<()> {
+        if !self.cfg.xattr {
+            return Err(io::Error::from_raw_os_error(libc::ENOSYS));
+        }
+
         // The f{set,get,remove,list}xattr functions don't work on an fd opened with `O_PATH` so we
         // need to get a new fd.
         let file = self.open_inode(inode, libc::O_RDONLY | libc::O_NONBLOCK)?;
@@ -1536,7 +1600,7 @@ impl FileSystem for PassthroughFs {
             .map(Arc::clone)
             .ok_or_else(ebadf)?;
 
-        let fd = data.file.lock().unwrap().as_raw_fd();
+        let fd = data.file.write().unwrap().as_raw_fd();
         // Safe because this doesn't modify any memory and we check the return value.
         let res = unsafe {
             libc::fallocate64(
@@ -1552,4 +1616,32 @@ impl FileSystem for PassthroughFs {
             Err(io::Error::last_os_error())
         }
     }
+
+    fn lseek(
+        &self,
+        _ctx: Context,
+        inode: Inode,
+        handle: Handle,
+        offset: u64,
+        whence: u32,
+    ) -> io::Result<u64> {
+        let data = self
+            .handles
+            .read()
+            .unwrap()
+            .get(&handle)
+            .filter(|hd| hd.inode == inode)
+            .map(Arc::clone)
+            .ok_or_else(ebadf)?;
+
+        let fd = data.file.write().unwrap().as_raw_fd();
+
+        // Safe because this doesn't modify any memory and we check the return value.
+        let res = unsafe { libc::lseek(fd, offset as libc::off64_t, whence as libc::c_int) };
+        if res < 0 {
+            Err(io::Error::last_os_error())
+        } else {
+            Ok(res as u64)
+        }
+    }
 }

vhost_user_fs/src/server.rs

@@ -10,6 +10,7 @@ use std::mem::size_of;
 use libc;
 use vm_memory::ByteValued;
 
+use super::fs_cache_req_handler::FsCacheReqHandler;
 use crate::descriptor_utils::{Reader, Writer};
 use crate::filesystem::{
     Context, DirEntry, Entry, FileSystem, GetxattrReply, ListxattrReply, ZeroCopyReader,
@@ -63,7 +64,12 @@ impl<F: FileSystem + Sync> Server<F> {
     }
 
     #[allow(clippy::cognitive_complexity)]
-    pub fn handle_message(&self, mut r: Reader, w: Writer) -> Result<usize> {
+    pub fn handle_message<T: FsCacheReqHandler>(
+        &self,
+        mut r: Reader,
+        w: Writer,
+        vu_req: Option<&mut T>,
+    ) -> Result<usize> {
         let in_header: InHeader = r.read_obj().map_err(Error::DecodeMessage)?;
 
         if in_header.len > MAX_BUFFER_SIZE {
@@ -118,6 +124,8 @@ impl<F: FileSystem + Sync> Server<F> {
             x if x == Opcode::Readdirplus as u32 => self.readdirplus(in_header, r, w),
             x if x == Opcode::Rename2 as u32 => self.rename2(in_header, r, w),
             x if x == Opcode::Lseek as u32 => self.lseek(in_header, r, w),
+            x if x == Opcode::SetupMapping as u32 => self.setupmapping(in_header, r, w, vu_req),
+            x if x == Opcode::RemoveMapping as u32 => self.removemapping(in_header, r, w, vu_req),
             _ => reply_error(
                 io::Error::from_raw_os_error(libc::ENOSYS),
                 in_header.unique,
@@ -126,6 +134,94 @@ impl<F: FileSystem + Sync> Server<F> {
         }
     }
 
+    fn setupmapping<T: FsCacheReqHandler>(
+        &self,
+        in_header: InHeader,
+        mut r: Reader,
+        w: Writer,
+        vu_req: Option<&mut T>,
+    ) -> Result<usize> {
+        if let Some(req) = vu_req {
+            let SetupmappingIn {
+                fh,
+                foffset,
+                len,
+                flags,
+                moffset,
+            } = r.read_obj().map_err(Error::DecodeMessage)?;
+
+            match self.fs.setupmapping(
+                Context::from(in_header),
+                in_header.nodeid.into(),
+                fh.into(),
+                foffset,
+                len,
+                flags,
+                moffset,
+                req,
+            ) {
+                Ok(()) => reply_ok(None::<u8>, None, in_header.unique, w),
+                Err(e) => reply_error(e, in_header.unique, w),
+            }
+        } else {
+            reply_error(
+                io::Error::from_raw_os_error(libc::EINVAL),
+                in_header.unique,
+                w,
+            )
+        }
+    }
+
+    fn removemapping<T: FsCacheReqHandler>(
+        &self,
+        in_header: InHeader,
+        mut r: Reader,
+        w: Writer,
+        vu_req: Option<&mut T>,
+    ) -> Result<usize> {
+        if let Some(req) = vu_req {
+            let RemovemappingIn { count } = r.read_obj().map_err(Error::DecodeMessage)?;
+
+            if let Some(size) = (count as usize).checked_mul(size_of::<RemovemappingOne>()) {
+                if size > MAX_BUFFER_SIZE as usize {
+                    return reply_error(
+                        io::Error::from_raw_os_error(libc::ENOMEM),
+                        in_header.unique,
+                        w,
+                    );
+                }
+            } else {
+                return reply_error(
+                    io::Error::from_raw_os_error(libc::EOVERFLOW),
+                    in_header.unique,
+                    w,
+                );
+            }
+
+            let mut requests = Vec::with_capacity(count as usize);
+            for _ in 0..count {
+                requests.push(
+                    r.read_obj::<RemovemappingOne>()
+                        .map_err(Error::DecodeMessage)?,
+                );
+            }
+
+            match self
+                .fs
+                .removemapping(Context::from(in_header), requests, req)
+            {
+                Ok(()) => reply_ok(None::<u8>, None, in_header.unique, w),
+                Err(e) => reply_error(e, in_header.unique, w),
+            }
+        } else {
+            reply_error(
+                io::Error::from_raw_os_error(libc::EINVAL),
+                in_header.unique,
+                w,
+            )
+        }
+    }
+
     fn lookup(&self, in_header: InHeader, mut r: Reader, w: Writer) -> Result<usize> {
         let namelen = (in_header.len as usize)
             .checked_sub(size_of::<InHeader>())
@@ -1145,11 +1241,24 @@ impl<F: FileSystem + Sync> Server<F> {
         }
     }
 
-    fn lseek(&self, in_header: InHeader, mut _r: Reader, w: Writer) -> Result<usize> {
+    fn lseek(&self, in_header: InHeader, mut r: Reader, w: Writer) -> Result<usize> {
-        if let Err(e) = self.fs.lseek() {
+        let LseekIn {
-            reply_error(e, in_header.unique, w)
+            fh, offset, whence, ..
-        } else {
+        } = r.read_obj().map_err(Error::DecodeMessage)?;
-            Ok(0)
+
+        match self.fs.lseek(
+            Context::from(in_header),
+            in_header.nodeid.into(),
+            fh.into(),
+            offset,
+            whence,
+        ) {
+            Ok(offset) => {
+                let out = LseekOut { offset };
+
+                reply_ok(Some(out), None, in_header.unique, w)
+            }
+            Err(e) => reply_error(e, in_header.unique, w),
         }
     }
 }

vhost_user_net/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "vhost_user_net"
+version = "0.1.0"
+authors = ["The Cloud Hypervisor Authors"]
+edition = "2018"
+
+[dependencies]
+bitflags = "1.1.0"
+epoll = ">=4.0.1"
+libc = "0.2.68"
+log = "0.4.8"
+net_util = { path = "../net_util" }
+vhost_user_backend = { path = "../vhost_user_backend" }
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", features = ["vhost-user-slave"] }
+virtio-bindings = "0.1.0"
+vm-memory = "0.1.0"
+vm-virtio = { path = "../vm-virtio" }
+vmm-sys-util = ">=0.3.1"