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

@@ -1,17 +1,20 @@
 [package]
 name = "cloud-hypervisor"
-version = "0.5.1"
+version = "0.6.0"
 authors = ["The Cloud Hypervisor Authors"]
 edition = "2018"
 default-run = "cloud-hypervisor"
+build = "build.rs"
 
 [dependencies]
-arc-swap = "0.4.4"
-clap = "2.33.0"
-epoll = "4.1.0"
+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"] }
+serde_json = ">=1.0.9"
 vhost_user_backend = { path = "vhost_user_backend"}
 vhost_user_block = { path = "vhost_user_block"}
 vhost_user_fs = { path = "vhost_user_fs"}
@@ -19,21 +22,17 @@ 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 = "0.4.0"
 vm-virtio = { path = "vm-virtio" }
-
-[dependencies.vhost_rs]
-path = "vhost_rs"
-features = ["vhost-user-slave"]
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", features = ["vhost-user-slave"] }
 
 [dev-dependencies]
-ssh2 = "0.7.1"
+ssh2 = "0.8.0"
 dirs = "2.0.2"
 credibility = "0.1.3"
 tempdir= "0.3.7"
 lazy_static= "1.4.0"
-serde_json = "1.0.48"
 
 [features]
 default = ["acpi", "pci", "cmos"]
@@ -49,7 +48,6 @@ integration_tests = []
 members = [
     "arch",
     "devices",
-    "vhost_rs",
     "qcow",
     "pci",
     "vmm",

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') {
-			agent { node { label 'bionic' } }
-			options {
-				timeout(time: 1, unit: 'HOURS')
-			}
-			stages {
-				stage ('Checkout') {
-					steps {
-						checkout scm
+		stage ('Build') {
+			failFast true
+            parallel {
+				stage ('Master build') {
+					agent { node { label 'master' } }
+					stages {
+						stage ('Checkout') {
+							steps {
+								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') {
-					steps {
-						sh "sudo DEBIAN_FRONTEND=noninteractive apt-get install -yq build-essential mtools libssl-dev pkg-config"
-							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"
-							sh "sudo snap install docker"
+				}	
+				stage ('Worker build') {
+					agent { node { label 'bionic' } }
+					options {
+						timeout(time: 1, unit: 'HOURS')
 					}
-				}
-				stage ('Install Rust') {
-					steps {
-						sh "nohup curl https://sh.rustup.rs -sSf | sh -s -- -y"
-					}
-				}
-				stage ('Run Cargo tests') {
-					steps {
-						sh "scripts/run_cargo_tests.sh"
-					}
-				}
-				stage ('Run OpenAPI tests') {
-					steps {
-						sh "scripts/run_openapi_tests.sh"
-					}
-				}
-				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"
+					stages {
+						stage ('Checkout') {
+							steps {
+								checkout scm
+							}
+						}
+						stage ('Run unit tests') {
+							steps {
+								sh "scripts/dev_cli.sh tests --unit"
+							}
+						}
+						stage ('Run integration tests') {
+							steps {
+								sh "scripts/dev_cli.sh tests --integration"
+							}
+						}
 					}
 				}
 			}
@@ -82,4 +85,4 @@ def cancelPreviousBuilds() {
 				build.doStop()
 			}
 		}
-}
+}

README.md

@@ -165,11 +165,11 @@ To build the kernel:
 
 # Clone the Cloud Hypervisor Linux branch
 $ pushd $CLOUDH
-$ git clone --depth 1 https://github.com/cloud-hypervisor/linux.git -b virtio-fs-virtio-iommu-5.5-rc1 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
 $ pushd linux-cloud-hypervisor
 
 # Use the cloud-hypervisor kernel config to build your kernel
-$ cp $CLOUDH/cloud-hypervisor/resources/linux-virtio-fs-virtio-iommu-config .config
+$ 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"
 

arch/Cargo.toml

@@ -10,15 +10,12 @@ default = []
 byteorder = "1.3.4"
 kvm-bindings = "0.2.0"
 kvm-ioctls = "0.5.0"
-libc = "0.2.66"
+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"]

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
 
@@ -31,6 +33,14 @@ pub enum Error {
     ZeroPagePastRamEnd,
     /// Error writing the zero page of guest memory.
     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
@@ -109,30 +154,171 @@ 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.last_addr();
@@ -227,7 +413,15 @@ mod tests {
     fn test_system_configuration() {
         let no_vcpus = 4;
         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(
+            &gm,
+            GuestAddress(0),
+            0,
+            1,
+            None,
+            None,
+            BootProtocol::LinuxBoot,
+        );
         assert!(config_err.is_err());
 
         // Now assigning some memory that falls before the 32bit memory hole.
@@ -239,7 +433,27 @@ mod tests {
             .map(|r| (r.0, r.1))
             .collect();
         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;
@@ -250,7 +464,27 @@ mod tests {
             .map(|r| (r.0, r.1))
             .collect();
         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;
@@ -261,7 +495,27 @@ mod tests {
             .map(|r| (r.0, r.1))
             .collect();
         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]
@@ -303,4 +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/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
 //
@@ -8,10 +10,11 @@
 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, GuestMemoryError, GuestMemoryMmap};
 
 // MTRR constants
@@ -81,16 +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<()> {
-    let regs: kvm_regs = kvm_regs {
-        rflags: 0x0000000000000002u64,
-        rip: boot_ip,
-        rsp: boot_sp,
-        rbp: boot_sp,
-        rsi: boot_si,
-        ..Default::default()
+pub fn setup_regs(
+    vcpu: &VcpuFd,
+    boot_ip: u64,
+    boot_sp: u64,
+    boot_si: u64,
+    boot_prot: BootProtocol,
+) -> Result<()> {
+    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)
 }
 
@@ -100,11 +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)?;
-    setup_page_tables(mem, &mut sregs)?; // TODO(dgreid) - Can this be done once per system instead?
+    configure_segments_and_sregs(mem, &mut sregs, boot_prot)?;
+
+    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)
 }
@@ -136,13 +157,31 @@ fn write_idt_value(val: u64, guest_mem: &GuestMemoryMmap) -> Result<()> {
         .map_err(Error::WriteIDT)
 }
 
-fn configure_segments_and_sregs(mem: &GuestMemoryMmap, sregs: &mut kvm_sregs) -> Result<()> {
-    let gdt_table: [u64; BOOT_GDT_MAX as usize] = [
-        gdt_entry(0, 0, 0),            // NULL
-        gdt_entry(0xa09b, 0, 0xfffff), // CODE
-        gdt_entry(0xc093, 0, 0xfffff), // DATA
-        gdt_entry(0x808b, 0, 0xfffff), // TSS
-    ];
+fn configure_segments_and_sregs(
+    mem: &GuestMemoryMmap,
+    sregs: &mut kvm_sregs,
+    boot_prot: BootProtocol,
+) -> Result<()> {
+    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 */
-    sregs.cr0 |= X86_CR0_PE;
-    sregs.efer |= EFER_LME | EFER_LMA;
+    match boot_prot {
+        BootProtocol::PvhBoot => {
+            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(())
 }
@@ -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);
     }

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

@@ -4,19 +4,20 @@ version = "0.1.0"
 authors = ["The Chromium OS Authors"]
 
 [dependencies]
-bitflags = "1.2.1"
+bitflags = ">=1.2.1"
 byteorder = "1.3.4"
-epoll = "4.1.0"
-libc = "0.2.66"
+epoll = ">=4.0.1"
+libc = "0.2.68"
 log = "0.4.8"
 vm-device = { path = "../vm-device" }
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
-vmm-sys-util = "0.4.0"
+acpi_tables = { path = "../acpi_tables", optional = true }
+vm-memory = "0.1.0"
+vmm-sys-util = ">=0.3.1"
 
 [dev-dependencies]
 tempfile = "3.1.0"
 
 [features]
 default = []
-acpi = []
+acpi = ["acpi_tables"]
 cmos = []

devices/src/acpi.rs

@@ -3,6 +3,7 @@
 // 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;
@@ -94,3 +95,57 @@ impl BusDevice for AcpiGEDDevice {
 
     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
-            .insert(Arc::new(Mutex::new(DummyDevice)), 0x10, 0x10)
-            .is_ok());
+        let device = Arc::new(Mutex::new(DummyDevice));
+        assert!(bus.insert(device.clone(), 0x10, 0x10).is_ok());
         assert!(bus.write(0x10, &mut data));
         assert!(bus.read(0x10, &mut data));
         assert_eq!(data, [1, 2, 3, 4]);

devices/src/lib.rs

@@ -13,6 +13,8 @@ extern crate epoll;
 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;
@@ -73,5 +75,6 @@ bitflags! {
         const NO_DEVICES_CHANGED = 0;
         const CPU_DEVICES_CHANGED = 0b1;
         const MEMORY_DEVICES_CHANGED = 0b10;
+        const PCI_DEVICES_CHANGED = 0b100;
     }
 }

docs/api.md

@@ -78,18 +78,20 @@ Shut the VMM down                   | `/vmm.shutdown` | N/A          | N/A
 
 #### 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
+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
 

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/hotplug.md

@@ -91,7 +91,7 @@ Before issuing the API request it is necessary to run the following command insi
 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:
+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

docs/networking.md

@@ -51,6 +51,11 @@ If the tap device is pre-created on host before guest boot up. To use multiple q
 [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_gen/Cargo.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 authors = ["The Chromium OS Authors"]
 
 [dependencies]
-vmm-sys-util = "0.4.0"
+vmm-sys-util = ">=0.3.1"

net_util/Cargo.toml

@@ -4,14 +4,14 @@ version = "0.1.0"
 authors = ["The Chromium OS Authors"]
 
 [dependencies]
-libc = "0.2.66"
+libc = "0.2.68"
 rand = "0.7.3"
-serde = "1.0.104"
-vmm-sys-util = "0.4.0"
+serde = "1.0.105"
+vmm-sys-util = ">=0.3.1"
 
 net_gen = { path = "../net_gen" }
 
 [dev-dependencies]
-lazy_static = "1.4.0"
+lazy_static = "1.3.0"
 pnet = "0.25.0"
 serde_json = "1.0.48"

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.
-    CreateTap(IoError),
+    /// Unable to configure tap interface.
+    ConfigureTap(IoError),
+    /// Unable to retrieve features.
+    GetFeatures(IoError),
+    /// Missing multiqueue support in the kernel.
+    MultiQueueKernelSupport,
     /// ioctl failed.
     IoctlError(IoError),
     /// Failed to create a socket.
@@ -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.
@@ -115,9 +133,8 @@ impl Tap {
         // 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() };

pci/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 vm-allocator = { path = "../vm-allocator" }
 byteorder = "1.3.4"
 devices = { path = "../devices" }
-libc = "0.2.66"
+libc = "0.2.68"
 log = "0.4.8"
 vm-device = { path = "../vm-device" }
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+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>;
 
@@ -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>>>,
-    device_reloc: Weak<dyn DeviceRelocation>,
+    devices: HashMap<u32, Arc<Mutex<dyn PciDevice>>>,
+    device_reloc: Arc<dyn DeviceRelocation>,
+    device_ids: Vec<bool>,
 }
 
 impl PciBus {
-    pub fn new(pci_root: PciRoot, device_reloc: Weak<dyn DeviceRelocation>) -> Self {
-        let mut devices: Vec<Arc<Mutex<dyn PciDevice>>> = Vec::new();
+    pub fn new(pci_root: PciRoot, device_reloc: Arc<dyn DeviceRelocation>) -> Self {
+        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<()> {
-        self.devices.push(device);
+    pub fn add_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 {
-        self.devices.len() as u32
+    pub fn remove_by_device(&mut self, device: &Arc<Mutex<dyn PciDevice>>) -> Result<()> {
+        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;
-    let function_number =
-        ((config_address >> FUNCTION_NUMBER_OFFSET) & FUNCTION_NUMBER_MASK) as usize;
-    let register_number =
-        ((config_address >> REGISTER_NUMBER_OFFSET) & REGISTER_NUMBER_MASK) as usize;
-
-    (bus_number, device_number, function_number, register_number)
+    (
+        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),
+    )
 }

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.
-const NUM_CONFIGURATION_REGISTERS: usize = 64;
+// The number of 32bit registers in the config space, 4096 bytes.
+const NUM_CONFIGURATION_REGISTERS: usize = 1024;
 
 const STATUS_REG: usize = 1;
 const STATUS_REG_CAPABILITIES_USED_MASK: u32 = 0x0010_0000;

pci/src/device.rs

@@ -55,6 +55,11 @@ 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.

pci/src/msi.rs

@@ -214,6 +214,8 @@ impl MsiConfig {
                     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);
                 }
             }
 

pci/src/msix.rs

@@ -116,6 +116,9 @@ impl MsixConfig {
                         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);
                     }
                 }
 

qcow/Cargo.toml

@@ -10,10 +10,10 @@ path = "src/qcow.rs"
 
 [dependencies]
 byteorder = "1.3.4"
-libc = "0.2.66"
+libc = "0.2.68"
 log = "0.4.8"
 remain = "0.2.1"
-vmm-sys-util = "0.4.0"
+vmm-sys-util = ">=0.3.1"
 vm-virtio = { path = "../vm-virtio" }
 
 [dev-dependencies]

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

@@ -1,3 +1,10 @@
+- [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)
@@ -41,6 +48,74 @@
     - [Unit testing](#unit-testing)
     - [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:

resources/Dockerfile

@@ -1,6 +1,6 @@
 FROM ubuntu:18.04 as dev
 
-ARG RUST_TOOLCHAIN="1.40.0"
+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"

resources/linux-config

@@ -1,6 +1,6 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 5.5.0-rc1 Kernel Configuration
+# Linux/x86 5.6.0-rc4 Kernel Configuration
 #
 
 #
@@ -14,7 +14,7 @@ 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
 
 #
@@ -169,6 +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
@@ -178,6 +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
@@ -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
@@ -320,6 +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
@@ -389,7 +394,6 @@ CONFIG_ARCH_USES_PG_UNCACHED=y
 CONFIG_ARCH_RANDOM=y
 CONFIG_X86_SMAP=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
@@ -411,8 +415,12 @@ CONFIG_ARCH_HAS_KEXEC_PURGATORY=y
 # 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
@@ -589,6 +597,7 @@ CONFIG_EFI_RUNTIME_WRAPPERS=y
 # 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
@@ -614,6 +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
@@ -662,7 +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
@@ -907,6 +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
@@ -936,6 +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
@@ -981,6 +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
 
 #
@@ -992,6 +1006,7 @@ 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
@@ -1015,7 +1030,11 @@ 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
@@ -1120,7 +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
 
@@ -1211,6 +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
@@ -1341,6 +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
@@ -1434,7 +1454,6 @@ CONFIG_PTP_1588_CLOCK=y
 # Enable PHYLIB and NETWORK_PHY_TIMESTAMPING to see the additional clocks.
 #
 CONFIG_PTP_1588_CLOCK_KVM=y
-# CONFIG_PTP_1588_CLOCK_IDTCM is not set
 # end of PTP clock support
 
 # CONFIG_PINCTRL is not set
@@ -1451,7 +1470,6 @@ 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
@@ -1514,7 +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
@@ -1719,7 +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
@@ -1740,6 +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
@@ -1771,6 +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
@@ -1909,6 +1930,7 @@ CONFIG_VIRTIO_IOMMU_TOPOLOGY=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
@@ -1920,7 +1942,7 @@ CONFIG_VIRTIO_IOMMU_TOPOLOGY=y
 # end of Performance monitor support
 
 CONFIG_RAS=y
-# CONFIG_THUNDERBOLT is not set
+# CONFIG_USB4 is not set
 
 #
 # Android
@@ -1950,6 +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
@@ -1989,6 +2012,7 @@ 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
@@ -2343,7 +2367,7 @@ CONFIG_CRYPTO_LIB_ARC4=y
 # CONFIG_CRYPTO_LIB_CHACHA is not set
 # CONFIG_CRYPTO_LIB_CURVE25519 is not set
 CONFIG_CRYPTO_LIB_DES=y
-CONFIG_CRYPTO_LIB_POLY1305_RSIZE=4
+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
@@ -2415,6 +2439,7 @@ CONFIG_IRQ_POLL=y
 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
@@ -2487,6 +2512,8 @@ 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
@@ -2592,14 +2619,46 @@ CONFIG_HAVE_C_RECORDMCOUNT=y
 CONFIG_TRACING_SUPPORT=y
 # CONFIG_FTRACE is not set
 # CONFIG_PROVIDE_OHCI1394_DMA_INIT is not set
-# CONFIG_KUNIT is not set
-# CONFIG_NOTIFIER_ERROR_INJECTION is not set
-# CONFIG_FAULT_INJECTION is not set
-# end of Kernel hacking
+# 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
@@ -2633,38 +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_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_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_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
 # end of Kernel Testing and Coverage
+# end of Kernel hacking

scripts/dev_cli.sh

@@ -23,7 +23,8 @@ CLH_INTEGRATION_WORKLOADS="${HOME}/workloads"
 
 # Container paths
 CTR_CLH_ROOT_DIR="/cloud-hypervisor"
-CTR_CLH_CARGO_TARGET="${CTR_CLH_ROOT_DIR}/build/cargo_target"
+CTR_CLH_CARGO_BUILT_DIR="${CTR_CLH_ROOT_DIR}/build"
+CTR_CLH_CARGO_TARGET="${CTR_CLH_CARGO_BUILT_DIR}/cargo_target"
 CTR_CLH_INTEGRATION_WORKLOADS="/root/workloads"
 
 # Cargo paths
@@ -112,6 +113,25 @@ ensure_build_dir() {
     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)"
@@ -163,7 +183,7 @@ cmd_build() {
     [ $build = "release" ] && cargo_args+=("--release")
 
     $DOCKER_RUNTIME run \
-	   -ti \
+	   --user "$(id -u):$(id -g)" \
 	   --workdir "$CTR_CLH_ROOT_DIR" \
 	   --rm \
 	   --volume /dev:/dev \
@@ -171,23 +191,14 @@ cmd_build() {
 	   "$CTR_IMAGE" \
 	   cargo build \
 	         --target-dir "$CTR_CLH_CARGO_TARGET" \
-	         "${cargo_args[@]}"
-
-    ret=$?
-
-    # If `cargo build` was successful, let's copy the binaries to a more
-    # accessible location.
-    [ $ret -eq 0 ] && {
-        cargo_bin_dir="$CLH_CARGO_TARGET/$build"
-        say "Binaries placed under $cargo_bin_dir"
-    }
+	         "${cargo_args[@]}" && say "Binaries placed under $CLH_CARGO_TARGET/$build"
 }
 
 cmd_clean() {
     cargo_args=("$@")
 
     $DOCKER_RUNTIME run \
-	   -ti \
+	   --user "$(id -u):$(id -g)" \
 	   --workdir "$CTR_CLH_ROOT_DIR" \
 	   --rm \
 	   --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" \
@@ -220,7 +231,6 @@ cmd_tests() {
     if [ "$unit" = true ] ;  then
 	say "Running unit tests..."
 	$DOCKER_RUNTIME run \
-	       -ti \
 	       --workdir "$CTR_CLH_ROOT_DIR" \
 	       --rm \
 	       --device /dev/kvm \
@@ -228,33 +238,38 @@ cmd_tests() {
 	       --cap-add net_admin \
 	       --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" \
 	       "$CTR_IMAGE" \
-	       ./scripts/run_unit_tests.sh "$@"
+	       ./scripts/run_unit_tests.sh "$@" || fix_dir_perms $? || exit $?
     fi
 
     if [ "$cargo" = true ] ;  then
 	say "Running cargo tests..."
 	$DOCKER_RUNTIME run \
-	       -ti \
 	       --workdir "$CTR_CLH_ROOT_DIR" \
 	       --rm \
 	       --volume "$CLH_ROOT_DIR:$CTR_CLH_ROOT_DIR" \
 	       "$CTR_IMAGE" \
-	       ./scripts/run_cargo_tests.sh
+	       ./scripts/run_cargo_tests.sh || fix_dir_perms $? || exit $?
     fi
 
     if [ "$integration" = true ] ;  then
 	say "Running integration tests..."
 	$DOCKER_RUNTIME run \
-	       -ti \
 	       --workdir "$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" \
 	       "$CTR_IMAGE" \
-	       ./scripts/run_integration_tests.sh "$@"
+	       ./scripts/run_integration_tests.sh "$@" || fix_dir_perms $? || exit $?
     fi
+
+    fix_dir_perms $?
 }
 
 cmd_build-container() {

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
-    time 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
-    time 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
-    time 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
-    time 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
-    time 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
-    time wget --quiet $EOAN_OS_IMAGE_URL
+    time wget --quiet $EOAN_OS_IMAGE_URL || exit 1
     popd
 fi
 
@@ -62,12 +64,12 @@ 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
-    time 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
-curl --silent "https://cloudhypervisorstorage.blob.core.windows.net/images/sha1sums" | sha1sum --check
+sha1sum sha1sums --check
 if [ $? -ne 0 ]; then
     echo "sha1sum validation of images failed, remove invalid images to fix the issue."
     exit 1
@@ -76,22 +78,38 @@ 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
-    time git clone --depth 1 "https://github.com/cloud-hypervisor/linux.git" -b "virtio-fs-virtio-iommu-topo-5.5-rc1" $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"
     time make bzImage -j `nproc`
-    cp vmlinux $VMLINUX_IMAGE
-    cp arch/x86/boot/bzImage $BZIMAGE_IMAGE
+    cp vmlinux $VMLINUX_IMAGE || exit 1
+    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="$WORKLOADS_DIR/virtiofsd"
@@ -102,10 +120,10 @@ if [ ! -f "$VIRTIOFSD" ]; then
     pushd $QEMU_DIR
     time ./configure --prefix=$PWD --target-list=x86_64-softmmu
     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
 
@@ -117,7 +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 $MNT_DIR
    popd
@@ -127,7 +145,7 @@ SHARED_DIR="$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"
@@ -135,7 +153,7 @@ rm -rf $VFIO_DIR
 mkdir -p $VFIO_DIR
 cp $CLEAR_OS_IMAGE $VFIO_DIR
 cp $FW $VFIO_DIR
-cp $VMLINUX_IMAGE $VFIO_DIR
+cp $VMLINUX_IMAGE $VFIO_DIR || exit 1
 
 # VFIO test network setup.
 # We reserve a different IP class for it: 172.17.0.0/24.
@@ -155,13 +173,22 @@ 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.
@@ -170,7 +197,7 @@ 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
-time 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
@@ -202,5 +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/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

@@ -24,9 +24,9 @@ fn main() {
             Arg::with_name("block-backend")
                 .long("block-backend")
                 .help(
-                    "vhost-user-block backend parameters \"image=<image_path>,\
-                     sock=<socket_path>,num_queues=<number_of_queues>,\
-                     readonly=true|false,direct=true|false\"",
+                    "vhost-user-block backend parameters \
+                     \"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),

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;
@@ -45,6 +53,8 @@ type VhostUserBackendResult<T> = std::result::Result<T, std::io::Error>;
 enum Error {
     /// Failed to create kill eventfd.
     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)?,
             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<()> {
-        let mem = self.mem.as_ref().ok_or(Error::NoMemoryConfigured)?;
+    fn process_queue(&mut self, vring_lock: Arc<RwLock<Vring>>) -> Result<bool> {
+        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;
-            let reader = Reader::new(mem, avail_desc.clone()).unwrap();
-            let writer = Writer::new(mem, avail_desc.clone()).unwrap();
+            used_any = true;
 
-            let total = self
-                .server
-                .handle_message(reader, writer)
-                .map_err(Error::ProcessQueue)?;
+            // Prepare a set of objects that can be moved to the worker thread.
+            let desc_head = avail_desc.get_head();
+            let atomic_mem = atomic_mem.clone();
+            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);
-            used_count += 1;
+            self.pool.spawn_ok(async move {
+                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 {
-            for &(desc_index, _) in &used_desc_heads[..used_count] {
-                vring.mut_queue().add_used(&mem, desc_index, 0);
-            }
-            vring.signal_used_queue().unwrap();
-        }
-
-        Ok(())
+        Ok(used_any)
     }
 }
 
@@ -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");
-                let mut vring = vrings[1].write().unwrap();
-                self.process_queue(&mut vring)?;
-            }
-            KILL_EVENT => {
-                debug!("KILL_EVENT");
-                self.kill_evt.read().unwrap();
-                return Ok(true);
+                debug!("QUEUE_EVENT");
+                vrings[1].clone()
             }
             _ => 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);
-        process::exit(1);
+        error!("Waiting for daemon failed: {:?}", e);
+    }
+
+    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

@@ -22,10 +22,9 @@ fn main() {
             Arg::with_name("net-backend")
                 .long("net-backend")
                 .help(
-                    "vhost-user-net backend parameters \"ip=<ip_addr>,\
-                     mask=<net_mask>,sock=<socket_path>,\
-                     num_queues=<number_of_queues>,\
-                     queue_size=<size_of_each_queue>\"",
+                    "vhost-user-net backend parameters \
+                     \"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),

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
@@ -66,4 +77,4 @@ write_files:
         # 512M ram requires 256 pages
         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=/dev/vda2 VFIOTAG" --disk path=/mnt/clear-31310-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/
+        /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

@@ -4,21 +4,18 @@ version = "0.0.1"
 authors = ["The Cloud Hypervisor Authors"]
 
 [dependencies]
-arc-swap = "0.4.4"
+arc-swap = ">=0.4.4"
 byteorder = "1.3.4"
 devices = { path = "../devices" }
 kvm-bindings = "0.2.0"
 kvm-ioctls = "0.5.0"
-libc = "0.2.66"
+libc = "0.2.68"
 log = "0.4.8"
 pci = { path = "../pci" }
 vm-allocator = { path = "../vm-allocator" }
 vm-device = { path = "../vm-device" }
-vmm-sys-util = "0.4.0"
-
-[dependencies.vm-memory]
-git = "https://github.com/rust-vmm/vm-memory"
-features = ["backend-mmap"]
+vm-memory = { version = "0.1.0", features = ["backend-mmap"] }
+vmm-sys-util = ">=0.3.1"
 
 [dependencies.vfio-bindings]
 git = "https://github.com/rust-vmm/vfio-bindings"

vfio/src/vfio_device.rs

@@ -3,7 +3,6 @@
 // SPDX-License-Identifier: Apache-2.0 OR BSD-3-Clause
 //
 use crate::vec_with_array_field;
-use arc_swap::ArcSwap;
 use byteorder::{ByteOrder, LittleEndian};
 use kvm_ioctls::*;
 use std::collections::HashMap;
@@ -24,7 +23,10 @@ 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::*;
@@ -51,6 +53,7 @@ pub enum VfioError {
     IommuDmaUnmap,
     VfioDeviceGetIrqInfo,
     VfioDeviceSetIrq,
+    VfioNoIommuGroup(String),
     ReadLink(io::Error),
     ParseInt(num::ParseIntError),
 }
@@ -102,6 +105,7 @@ 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),
         }
     }
@@ -522,11 +526,11 @@ impl VfioDeviceInfo {
 /// associated with a specific VFIO container.
 pub struct VfioDmaMapping {
     container: Arc<VfioContainer>,
-    memory: Arc<ArcSwap<GuestMemoryMmap>>,
+    memory: GuestMemoryAtomic<GuestMemoryMmap>,
 }
 
 impl VfioDmaMapping {
-    pub fn new(container: Arc<VfioContainer>, memory: Arc<ArcSwap<GuestMemoryMmap>>) -> Self {
+    pub fn new(container: Arc<VfioContainer>, memory: GuestMemoryAtomic<GuestMemoryMmap>) -> Self {
         VfioDmaMapping { container, memory }
     }
 }
@@ -534,7 +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.load(),
+            &self.memory.memory(),
             GuestAddress(gpa),
             size.try_into().unwrap(),
         ) {
@@ -585,7 +589,7 @@ pub struct VfioDevice {
     group: VfioGroup,
     regions: Vec<VfioRegion>,
     irqs: HashMap<u32, VfioIrq>,
-    mem: Arc<ArcSwap<GuestMemoryMmap>>,
+    mem: GuestMemoryAtomic<GuestMemoryMmap>,
     iommu_attached: bool,
 }
 
@@ -596,10 +600,15 @@ impl VfioDevice {
     pub fn new(
         sysfspath: &Path,
         device_fd: Arc<DeviceFd>,
-        mem: Arc<ArcSwap<GuestMemoryMmap>>,
+        mem: GuestMemoryAtomic<GuestMemoryMmap>,
         iommu_attached: bool,
     ) -> Result<Self> {
         let uuid_path: PathBuf = [sysfspath, Path::new("iommu_group")].iter().collect();
+        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)?;
@@ -842,7 +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.load().with_regions(|_index, region| {
+            self.mem.memory().with_regions(|_index, region| {
                 self.vfio_dma_map(
                     region.start_addr().raw_value(),
                     region.len() as u64,
@@ -857,7 +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.load().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

@@ -222,6 +222,7 @@ impl Interrupt {
 struct MmioRegion {
     start: GuestAddress,
     length: GuestUsize,
+    type_: PciBarRegionType,
     index: u32,
     mem_slot: Option<u32>,
     host_addr: Option<u64>,
@@ -502,9 +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
@@ -548,8 +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,
@@ -563,24 +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) {
-                let ret = unsafe { libc::munmap(addr as *mut libc::c_void, size) };
+            if let (Some(host_addr), Some(mmap_size), Some(mem_slot)) =
+                (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()
                     );
                 }
@@ -798,6 +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,
@@ -817,6 +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

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 = "1.2.1"
-libc = "0.2.66"
-vmm-sys-util = "0.4.0"
-
-[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 @@
-
-                                 Apache License
-                           Version 2.0, January 2004
-                        http://www.apache.org/licenses/
-
-   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
-   1. Definitions.
-
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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

@@ -1,730 +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 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());
-    }
-
-    #[test]
-    #[ignore]
-    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]
-    #[ignore]
-    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]
-    #[ignore]
-    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

@@ -1,766 +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]
-    #[ignore]
-    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]
-    #[ignore]
-    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]
-    #[ignore]
-    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]
-    #[ignore]
-    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

@@ -1,812 +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.
-pub 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]
-    #[ignore]
-    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, 1).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

@@ -10,13 +10,11 @@ pci_support = ["vm-virtio/pci_support"]
 mmio_support = ["vm-virtio/mmio_support"]
 
 [dependencies]
-epoll = "4.1.0"
-libc = "0.2.66"
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+epoll = ">=4.0.1"
+libc = "0.2.68"
+log = "0.4.8"
+virtio-bindings = "0.1.0"
+vm-memory = "0.1.0"
 vm-virtio = { path = "../vm-virtio" }
-vmm-sys-util = "0.4.0"
-
-[dependencies.vhost_rs]
-path = "../vhost_rs"
-features = ["vhost-user-slave"]
-
+vmm-sys-util = ">=0.3.1"
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", 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> {
-        if let Some(call) = self.call.as_ref() {
-            return call.write(1);
+    pub fn set_event_idx(&mut self, enabled: bool) {
+        /* Also reset the last signalled event */
+        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) {
-                    println!(
-                        "vring handler handle event {} with error {:?}\n",
-                        ev_type, e
-                    );
+                if handler
+                    .handle_event(ev_type, evset)
+                    .map_err(VringWorkerError::HandleEvent)?
+                {
                     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()
-            .name("vring_worker".to_string())
-            .spawn(move || vring_worker.run(vring_handler))
-            .map_err(VhostUserHandlerError::SpawnVringWorker)?;
+        let exit_event_id =
+            if let Some((exit_event_fd, exit_event_id)) = backend.read().unwrap().exit_event() {
+                let exit_event_id = exit_event_id.unwrap_or(num_queues as u16);
+                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,
         })
     }
 
@@ -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

@@ -5,14 +5,14 @@ authors = ["The Cloud Hypervisor Authors"]
 edition = "2018"
 
 [dependencies]
-bitflags = "1.2.1"
-epoll = "4.1.0"
-libc = "0.2.66"
+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 = { path = "../vhost_rs" }
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", features = ["vhost-user-slave"] }
 virtio-bindings = "0.1.0"
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+vm-memory = "0.1.0"
 vm-virtio = { path = "../vm-virtio" }
-vmm-sys-util = "0.4.0"
+vmm-sys-util = ">=0.3.1"

vhost_user_block/src/lib.rs

@@ -14,6 +14,7 @@ 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;
@@ -21,22 +22,31 @@ 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 {}
@@ -62,6 +72,28 @@ pub enum Error {
     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 {
@@ -72,10 +104,19 @@ pub struct VhostUserBlkBackend {
     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) -> Result<Self> {
+    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);
@@ -112,6 +153,9 @@ impl VhostUserBlkBackend {
             disk_nsectors: nsectors,
             config,
             rdonly,
+            poll_queue,
+            event_idx: false,
+            kill_evt: EventFd::new(EFD_NONBLOCK).map_err(Error::CreateKillEventFd)?,
         })
     }
 
@@ -150,8 +194,23 @@ impl VhostUserBlkBackend {
                     len = 0;
                 }
             }
-            vring.mut_queue().add_used(mem, head.index, len);
-            used_any = true;
+
+            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
@@ -174,6 +233,7 @@ impl VhostUserBackend for VhostUserBlkBackend {
     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();
 
@@ -187,6 +247,10 @@ impl VhostUserBackend for VhostUserBlkBackend {
         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(())
@@ -199,19 +263,50 @@ impl VhostUserBackend for VhostUserBlkBackend {
         vrings: &[Arc<RwLock<Vring>>],
     ) -> VhostUserBackendResult<bool> {
         if evset != epoll::Events::EPOLLIN {
-            warn!("invalid events operation");
-            return Ok(false);
+            return Err(Error::HandleEventNotEpollIn.into());
         }
 
         debug!("event received: {:?}", device_event);
 
-        let mut vring = vrings[device_event as usize].write().unwrap();
-        if self.process_queue(&mut vring) {
-            debug!("signalling queue");
-            vring.signal_used_queue().unwrap();
-        }
+        match device_event {
+            q if device_event < self.config.num_queues => {
+                let mut vring = vrings[q as usize].write().unwrap();
 
-        Ok(false)
+                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> {
@@ -225,6 +320,10 @@ impl VhostUserBackend for VhostUserBlkBackend {
 
         buf.to_vec()
     }
+
+    fn exit_event(&self) -> Option<(EventFd, Option<u16>)> {
+        Some((self.kill_evt.try_clone().unwrap(), None))
+    }
 }
 
 pub struct VhostUserBlkBackendConfig<'a> {
@@ -233,6 +332,7 @@ pub struct VhostUserBlkBackendConfig<'a> {
     pub num_queues: usize,
     pub readonly: bool,
     pub direct: bool,
+    pub poll_queue: bool,
 }
 
 impl<'a> VhostUserBlkBackendConfig<'a> {
@@ -244,6 +344,7 @@ impl<'a> VhostUserBlkBackendConfig<'a> {
         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=") {
@@ -262,6 +363,11 @@ impl<'a> VhostUserBlkBackendConfig<'a> {
                     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),
+                }
             }
         }
 
@@ -283,6 +389,7 @@ impl<'a> VhostUserBlkBackendConfig<'a> {
             num_queues,
             readonly,
             direct,
+            poll_queue,
         })
     }
 }
@@ -302,6 +409,7 @@ pub fn start_block_backend(backend_command: &str) {
             backend_config.num_queues,
             backend_config.readonly,
             backend_config.direct,
+            backend_config.poll_queue,
         )
         .unwrap(),
     ));
@@ -318,19 +426,25 @@ pub fn start_block_backend(backend_command: &str) {
     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() {
-        println!(
-            "failed to start daemon for vhost-user-blk with error: {:?}\n",
+        error!(
+            "Failed to start daemon for vhost-user-block with error: {:?}\n",
             e
         );
         process::exit(1);
     }
 
-    blk_daemon.wait().unwrap();
+    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

@@ -5,8 +5,9 @@ authors = ["The Cloud Hypervisor Authors"]
 edition = "2018"
 
 [dependencies]
-bitflags = "1.2.1"
-libc = "0.2.66"
+bitflags = "1.1.0"
+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| {

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> {
-        if let Err(e) = self.fs.lseek() {
-            reply_error(e, in_header.unique, w)
-        } else {
-            Ok(0)
+    fn lseek(&self, in_header: InHeader, mut r: Reader, w: Writer) -> Result<usize> {
+        let LseekIn {
+            fh, offset, whence, ..
+        } = r.read_obj().map_err(Error::DecodeMessage)?;
+
+        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

@@ -5,14 +5,14 @@ authors = ["The Cloud Hypervisor Authors"]
 edition = "2018"
 
 [dependencies]
-bitflags = "1.2.1"
-epoll = "4.1.0"
-libc = "0.2.66"
+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 = { path = "../vhost_rs" }
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", features = ["vhost-user-slave"] }
 virtio-bindings = "0.1.0"
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+vm-memory = "0.1.0"
 vm-virtio = { path = "../vm-virtio" }
-vmm-sys-util = "0.4.0"
+vmm-sys-util = ">=0.3.1"

vhost_user_net/src/lib.rs

@@ -22,7 +22,6 @@ use std::io::Read;
 use std::io::{self};
 use std::net::Ipv4Addr;
 use std::os::unix::io::AsRawFd;
-use std::os::unix::io::RawFd;
 use std::process;
 use std::sync::{Arc, RwLock};
 use std::vec::Vec;
@@ -105,22 +104,6 @@ pub struct VhostUserNetBackend {
     queue_size: u16,
 }
 
-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(),
-            taps: self.taps.clone(),
-            rxs: self.rxs.clone(),
-            txs: self.txs.clone(),
-            rx_tap_listenings: self.rx_tap_listenings.clone(),
-            num_queues: self.num_queues,
-            queue_size: self.queue_size,
-        }
-    }
-}
-
 impl VhostUserNetBackend {
     /// Create a new virtio network device with the given TAP interface.
     pub fn new_with_tap(taps: Vec<Tap>, num_queues: usize, queue_size: u16) -> Result<Self> {
@@ -161,9 +144,10 @@ impl VhostUserNetBackend {
         netmask: Ipv4Addr,
         num_queues: usize,
         queue_size: u16,
+        ifname: Option<&str>,
     ) -> Result<Self> {
-        let taps =
-            open_tap(None, Some(ip_addr), Some(netmask), num_queues / 2).map_err(Error::OpenTap)?;
+        let taps = open_tap(ifname, Some(ip_addr), Some(netmask), num_queues / 2)
+            .map_err(Error::OpenTap)?;
 
         Self::new_with_tap(taps, num_queues, queue_size)
     }
@@ -266,13 +250,6 @@ impl VhostUserNetBackend {
     pub fn set_vring_worker(&mut self, vring_worker: Option<Arc<VringWorker>>) {
         self.vring_worker = vring_worker;
     }
-
-    pub fn get_kill_event(&self) -> (u16, RawFd) {
-        (
-            (self.num_queues + (self.num_queues / 2)) as u16,
-            self.kill_evt.as_raw_fd(),
-        )
-    }
 }
 
 impl VhostUserBackend for VhostUserNetBackend {
@@ -299,6 +276,8 @@ impl VhostUserBackend for VhostUserNetBackend {
         VhostUserProtocolFeatures::all()
     }
 
+    fn set_event_idx(&mut self, _enabled: bool) {}
+
     fn update_memory(&mut self, mem: GuestMemoryMmap) -> VhostUserBackendResult<()> {
         self.mem = Some(mem);
         Ok(())
@@ -316,7 +295,6 @@ impl VhostUserBackend for VhostUserNetBackend {
 
         let tap_start_index = self.num_queues as u16;
         let tap_end_index = (self.num_queues + self.num_queues / 2 - 1) as u16;
-        let kill_index = tap_end_index + 1;
 
         match device_event {
             x if ((x < self.num_queues as u16) && (x % 2 == 0)) => {
@@ -356,15 +334,17 @@ impl VhostUserBackend for VhostUserNetBackend {
                     self.process_rx(&mut vring, index)?;
                 }
             }
-            x if x == kill_index => {
-                self.kill_evt.read().unwrap();
-                return Ok(true);
-            }
             _ => return Err(Error::HandleEventUnknownEvent.into()),
         }
 
         Ok(false)
     }
+
+    fn exit_event(&self) -> Option<(EventFd, Option<u16>)> {
+        let tap_end_index = (self.num_queues + self.num_queues / 2 - 1) as u16;
+        let kill_index = tap_end_index + 1;
+        Some((self.kill_evt.try_clone().unwrap(), Some(kill_index)))
+    }
 }
 
 pub struct VhostUserNetBackendConfig<'a> {
@@ -373,6 +353,7 @@ pub struct VhostUserNetBackendConfig<'a> {
     pub sock: &'a str,
     pub num_queues: usize,
     pub queue_size: u16,
+    pub tap: Option<&'a str>,
 }
 
 impl<'a> VhostUserNetBackendConfig<'a> {
@@ -384,6 +365,7 @@ impl<'a> VhostUserNetBackendConfig<'a> {
         let mut sock: &str = "";
         let mut num_queues_str: &str = "";
         let mut queue_size_str: &str = "";
+        let mut tap_str: &str = "";
 
         for param in params_list.iter() {
             if param.starts_with("ip=") {
@@ -396,6 +378,8 @@ impl<'a> VhostUserNetBackendConfig<'a> {
                 num_queues_str = &param[11..];
             } else if param.starts_with("queue_size=") {
                 queue_size_str = &param[11..];
+            } else if param.starts_with("tap=") {
+                tap_str = &param[4..];
             }
         }
 
@@ -403,6 +387,7 @@ impl<'a> VhostUserNetBackendConfig<'a> {
         let mut mask: Ipv4Addr = Ipv4Addr::new(255, 255, 255, 0);
         let mut num_queues: usize = 2;
         let mut queue_size: u16 = 256;
+        let mut tap: Option<&str> = None;
 
         if sock.is_empty() {
             return Err(Error::ParseSockParam);
@@ -419,6 +404,9 @@ impl<'a> VhostUserNetBackendConfig<'a> {
         if !queue_size_str.is_empty() {
             queue_size = queue_size_str.parse().map_err(Error::ParseQueueSizeParam)?;
         }
+        if !tap_str.is_empty() {
+            tap = Some(tap_str);
+        }
 
         Ok(VhostUserNetBackendConfig {
             ip,
@@ -426,6 +414,7 @@ impl<'a> VhostUserNetBackendConfig<'a> {
             sock,
             num_queues,
             queue_size,
+            tap,
         })
     }
 }
@@ -445,6 +434,7 @@ pub fn start_net_backend(backend_command: &str) {
             backend_config.mask,
             backend_config.num_queues,
             backend_config.queue_size,
+            backend_config.tap,
         )
         .unwrap(),
     ));
@@ -456,16 +446,8 @@ pub fn start_net_backend(backend_command: &str) {
     )
     .unwrap();
 
-    let (kill_index, kill_evt_fd) = net_backend.read().unwrap().get_kill_event();
     let vring_worker = net_daemon.get_vring_worker();
 
-    if let Err(e) =
-        vring_worker.register_listener(kill_evt_fd, epoll::Events::EPOLLIN, u64::from(kill_index))
-    {
-        println!("failed to register listener for kill event: {:?}", e);
-        process::exit(1);
-    }
-
     net_backend
         .write()
         .unwrap()
@@ -479,5 +461,12 @@ pub fn start_net_backend(backend_command: &str) {
         process::exit(1);
     }
 
-    net_daemon.wait().unwrap();
+    if let Err(e) = net_daemon.wait() {
+        error!("Error from the main thread: {:?}", e);
+    }
+
+    let kill_evt = &net_backend.write().unwrap().kill_evt;
+    if let Err(e) = kill_evt.write(1) {
+        error!("Error shutting down worker thread: {:?}", e)
+    }
 }

vm-allocator/Cargo.toml

@@ -5,5 +5,5 @@ authors = ["The Chromium OS Authors"]
 edition = "2018"
 
 [dependencies]
-libc = "0.2.66"
-vm-memory = { git = "https://github.com/rust-vmm/vm-memory" }
+libc = "0.2.68"
+vm-memory = "0.1.0"

vm-allocator/src/system.rs

@@ -131,4 +131,10 @@ impl SystemAllocator {
     pub fn free_mmio_addresses(&mut self, address: GuestAddress, size: GuestUsize) {
         self.mmio_address_space.free(address, size)
     }
+
+    /// Free an MMIO address range from the 32 bits hole.
+    /// We can only free a range if it matches exactly an already allocated range.
+    pub fn free_mmio_hole_addresses(&mut self, address: GuestAddress, size: GuestUsize) {
+        self.mmio_hole_address_space.free(address, size)
+    }
 }

vm-device/Cargo.toml

@@ -5,13 +5,11 @@ authors = ["The Cloud Hypervisor Authors"]
 edition = "2018"
 
 [dependencies]
-anyhow = "1.0.26"
-thiserror = "1.0.11"
-serde = { version = "1.0.104", features = ["rc"] }
-serde_derive = "1.0.104"
-serde_json = "1.0.48"
-vmm-sys-util = "0.4.0"
+anyhow = "1.0"
+thiserror = "1.0"
+serde = {version = ">=1.0.27", features = ["rc"] }
+serde_derive = ">=1.0.27"
+serde_json = ">=1.0.9"
+vm-memory = { version = "0.1.0", features = ["backend-mmap"] }
+vmm-sys-util = ">=0.3.1"
 
-[dependencies.vm-memory]
-git = "https://github.com/rust-vmm/vm-memory"
-features = ["backend-mmap"]

vm-device/src/interrupt/mod.rs

@@ -118,7 +118,7 @@ pub struct MsiIrqGroupConfig {
 ///
 /// The InterruptManager implementations should protect itself from concurrent accesses internally,
 /// so it could be invoked from multi-threaded context.
-pub trait InterruptManager {
+pub trait InterruptManager: Send + Sync {
     type GroupConfig;
 
     /// Create an [InterruptSourceGroup](trait.InterruptSourceGroup.html) object to manage

vm-device/src/lib.rs

@@ -49,7 +49,7 @@ pub trait Snapshotable {}
 /// All migratable components are paused before being snapshotted, and then
 /// eventually resumed. Thus any Migratable component must be both Pausable
 /// and Snapshotable.
-pub trait Migratable: Pausable + Snapshotable {}
+pub trait Migratable: Send + Pausable + Snapshotable {}
 
 fn get_region_host_address_range(
     region: &GuestRegionMmap,

vm-virtio/Cargo.toml

@@ -10,25 +10,19 @@ pci_support = ["pci"]
 mmio_support = []
 
 [dependencies]
-arc-swap = "0.4.4"
+arc-swap = ">=0.4.4"
 byteorder = "1.3.4"
 devices = { path = "../devices" }
-epoll = "4.1.0"
-libc = "0.2.66"
+epoll = ">=4.0.1"
+libc = "0.2.68"
 log = "0.4.8"
 net_gen = { path = "../net_gen" }
 net_util = { path = "../net_util" }
 pci = { path = "../pci", optional = true }
 tempfile = "3.1.0"
-virtio-bindings = { version = "0.1.0", features = ["virtio-v5_0_0"] }
+virtio-bindings = { git = "https://github.com/rust-vmm/virtio-bindings", version = "0.1", features = ["virtio-v5_0_0"]}
 vm-allocator = { path = "../vm-allocator" }
 vm-device = { path = "../vm-device" }
-vmm-sys-util = "0.4.0"
-
-[dependencies.vhost_rs]
-path = "../vhost_rs"
-features = ["vhost-user-master"]
-
-[dependencies.vm-memory]
-git = "https://github.com/rust-vmm/vm-memory"
-features = ["backend-mmap"]
+vm-memory = { version = "0.1.0", features = ["backend-mmap", "backend-atomic"] }
+vmm-sys-util = ">=0.3.1"
+vhost_rs = { git = "https://github.com/cloud-hypervisor/vhost", branch = "dragonball", package = "vhost", features = ["vhost-user-master", "vhost-user-slave"] }

vm-virtio/src/block.rs

@@ -14,7 +14,6 @@ use super::{
     VirtioDeviceType, VirtioInterruptType,
 };
 use crate::VirtioInterrupt;
-use arc_swap::ArcSwap;
 use epoll;
 use libc::{c_void, EFD_NONBLOCK};
 use std::alloc::{alloc_zeroed, dealloc, Layout};
@@ -33,7 +32,10 @@ use std::sync::{Arc, Mutex};
 use std::thread;
 use virtio_bindings::bindings::virtio_blk::*;
 use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
-use vm_memory::{ByteValued, Bytes, GuestAddress, GuestMemory, GuestMemoryError, GuestMemoryMmap};
+use vm_memory::{
+    ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemory, GuestMemoryAtomic,
+    GuestMemoryError, GuestMemoryMmap,
+};
 use vmm_sys_util::{eventfd::EventFd, seek_hole::SeekHole, write_zeroes::PunchHole};
 
 const SECTOR_SHIFT: u8 = 9;
@@ -590,7 +592,7 @@ impl Request {
 
 struct BlockEpollHandler<T: DiskFile> {
     queue: Queue,
-    mem: Arc<ArcSwap<GuestMemoryMmap>>,
+    mem: GuestMemoryAtomic<GuestMemoryMmap>,
     disk_image: Arc<Mutex<T>>,
     disk_nsectors: u64,
     interrupt_cb: Arc<dyn VirtioInterrupt>,
@@ -605,7 +607,7 @@ impl<T: DiskFile> BlockEpollHandler<T> {
 
         let mut used_desc_heads = Vec::new();
         let mut used_count = 0;
-        let mem = self.mem.load();
+        let mem = self.mem.memory();
         for avail_desc in queue.iter(&mem) {
             let len;
             match Request::parse(&avail_desc, &mem) {
@@ -743,6 +745,8 @@ impl<T: DiskFile> BlockEpollHandler<T> {
                         break 'epoll;
                     }
                     PAUSE_EVENT => {
+                        // Drain pause event
+                        let _ = self.pause_evt.read();
                         debug!("PAUSE_EVENT received, pausing virtio-block epoll loop");
                         // We loop here to handle spurious park() returns.
                         // Until we have not resumed, the paused boolean will
@@ -938,7 +942,7 @@ impl<T: 'static + DiskFile + Send> VirtioDevice for Block<T> {
 
     fn activate(
         &mut self,
-        mem: Arc<ArcSwap<GuestMemoryMmap>>,
+        mem: GuestMemoryAtomic<GuestMemoryMmap>,
         interrupt_cb: Arc<dyn VirtioInterrupt>,
         mut queues: Vec<Queue>,
         mut queue_evts: Vec<EventFd>,

vm-virtio/src/console.rs

@@ -7,7 +7,6 @@ use super::{
     VirtioInterruptType, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_VERSION_1,
 };
 use crate::VirtioInterrupt;
-use arc_swap::ArcSwap;
 use epoll;
 use libc::EFD_NONBLOCK;
 use std;
@@ -22,7 +21,7 @@ use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
 use std::sync::{Arc, Mutex};
 use std::thread;
 use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
-use vm_memory::{ByteValued, Bytes, GuestMemoryMmap};
+use vm_memory::{ByteValued, Bytes, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
 use vmm_sys_util::eventfd::EventFd;
 
 const QUEUE_SIZE: u16 = 256;
@@ -58,7 +57,7 @@ unsafe impl ByteValued for VirtioConsoleConfig {}
 
 struct ConsoleEpollHandler {
     queues: Vec<Queue>,
-    mem: Arc<ArcSwap<GuestMemoryMmap>>,
+    mem: GuestMemoryAtomic<GuestMemoryMmap>,
     interrupt_cb: Arc<dyn VirtioInterrupt>,
     in_buffer: Arc<Mutex<VecDeque<u8>>>,
     out: Arc<Mutex<Box<dyn io::Write + Send + Sync + 'static>>>,
@@ -87,7 +86,7 @@ impl ConsoleEpollHandler {
             return false;
         }
 
-        let mem = self.mem.load();
+        let mem = self.mem.memory();
         for avail_desc in recv_queue.iter(&mem) {
             let len = cmp::min(avail_desc.len as u32, in_buffer.len() as u32);
             let source_slice = in_buffer.drain(..len as usize).collect::<Vec<u8>>();
@@ -124,7 +123,7 @@ impl ConsoleEpollHandler {
         let mut used_desc_heads = [(0, 0); QUEUE_SIZE as usize];
         let mut used_count = 0;
 
-        let mem = self.mem.load();
+        let mem = self.mem.memory();
         for avail_desc in trans_queue.iter(&mem) {
             let len;
             let mut out = self.out.lock().unwrap();
@@ -276,6 +275,8 @@ impl ConsoleEpollHandler {
                         break 'epoll;
                     }
                     PAUSE_EVENT => {
+                        // Drain pause event
+                        let _ = self.pause_evt.read();
                         debug!("PAUSE_EVENT received, pausing virtio-console epoll loop");
                         // We loop here to handle spurious park() returns.
                         // Until we have not resumed, the paused boolean will
@@ -456,7 +457,7 @@ impl VirtioDevice for Console {
 
     fn activate(
         &mut self,
-        mem: Arc<ArcSwap<GuestMemoryMmap>>,
+        mem: GuestMemoryAtomic<GuestMemoryMmap>,
         interrupt_cb: Arc<dyn VirtioInterrupt>,
         queues: Vec<Queue>,
         mut queue_evts: Vec<EventFd>,

vm-virtio/src/device.rs

@@ -7,9 +7,8 @@
 // SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
 
 use super::*;
-use arc_swap::ArcSwap;
 use std::sync::Arc;
-use vm_memory::{GuestAddress, GuestMemoryMmap, GuestUsize};
+use vm_memory::{GuestAddress, GuestMemoryAtomic, GuestMemoryMmap, GuestUsize};
 use vmm_sys_util::eventfd::EventFd;
 
 pub enum VirtioInterruptType {
@@ -81,7 +80,7 @@ pub trait VirtioDevice: Send {
     /// Activates this device for real usage.
     fn activate(
         &mut self,
-        mem: Arc<ArcSwap<GuestMemoryMmap>>,
+        mem: GuestMemoryAtomic<GuestMemoryMmap>,
         interrupt_evt: Arc<dyn VirtioInterrupt>,
         queues: Vec<Queue>,
         queue_evts: Vec<EventFd>,
@@ -101,6 +100,12 @@ pub trait VirtioDevice: Send {
     fn iommu_translate(&self, addr: u64) -> u64 {
         addr
     }
+
+    /// Some devices may need to do some explicit shutdown work. This method
+    /// may be implemented to do this. The VMM should call shutdown() on
+    /// every device as part of shutting down the VM. Acting on the device
+    /// after a shutdown() can lead to unpredictable results.
+    fn shutdown(&mut self) {}
 }
 
 /// Trait providing address translation the same way a physical DMA remapping

vm-virtio/src/iommu.rs

@@ -8,7 +8,6 @@ use super::{
     VirtioDeviceType, VIRTIO_F_VERSION_1,
 };
 use crate::{DmaRemapping, VirtioInterrupt, VirtioInterruptType};
-use arc_swap::ArcSwap;
 use epoll;
 use libc::EFD_NONBLOCK;
 use std::cmp;
@@ -23,7 +22,10 @@ use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, RwLock};
 use std::thread;
 use vm_device::{ExternalDmaMapping, Migratable, MigratableError, Pausable, Snapshotable};
-use vm_memory::{Address, ByteValued, Bytes, GuestAddress, GuestMemoryError, GuestMemoryMmap};
+use vm_memory::{
+    Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
+    GuestMemoryError, GuestMemoryMmap,
+};
 use vmm_sys_util::eventfd::EventFd;
 
 /// Queues sizes
@@ -588,7 +590,7 @@ impl Request {
 
 struct IommuEpollHandler {
     queues: Vec<Queue>,
-    mem: Arc<ArcSwap<GuestMemoryMmap>>,
+    mem: GuestMemoryAtomic<GuestMemoryMmap>,
     interrupt_cb: Arc<dyn VirtioInterrupt>,
     queue_evts: Vec<EventFd>,
     kill_evt: EventFd,
@@ -602,7 +604,7 @@ impl IommuEpollHandler {
     fn request_queue(&mut self) -> bool {
         let mut used_desc_heads = [(0, 0); QUEUE_SIZE as usize];
         let mut used_count = 0;
-        let mem = self.mem.load();
+        let mem = self.mem.memory();
         for avail_desc in self.queues[0].iter(&mem) {
             let len = match Request::parse(
                 &avail_desc,
@@ -727,6 +729,8 @@ impl IommuEpollHandler {
                         break 'epoll;
                     }
                     PAUSE_EVENT => {
+                        // Drain pause event
+                        let _ = self.pause_evt.read();
                         debug!("PAUSE_EVENT received, pausing virtio-iommu epoll loop");
                         // We loop here to handle spurious park() returns.
                         // Until we have not resumed, the paused boolean will
@@ -941,7 +945,7 @@ impl VirtioDevice for Iommu {
 
     fn activate(
         &mut self,
-        mem: Arc<ArcSwap<GuestMemoryMmap>>,
+        mem: GuestMemoryAtomic<GuestMemoryMmap>,
         interrupt_cb: Arc<dyn VirtioInterrupt>,
         queues: Vec<Queue>,
         queue_evts: Vec<EventFd>,

vm-virtio/src/lib.rs

@@ -32,7 +32,7 @@ mod iommu;
 pub mod net;
 pub mod net_util;
 mod pmem;
-mod queue;
+pub mod queue;
 mod rng;
 pub mod vsock;
 

vm-virtio/src/net.rs

@@ -15,7 +15,6 @@ use super::{
     ActivateError, ActivateResult, Queue, VirtioDevice, VirtioDeviceType, VirtioInterruptType,
 };
 use crate::VirtioInterrupt;
-use arc_swap::ArcSwap;
 use epoll;
 use libc::EAGAIN;
 use libc::EFD_NONBLOCK;
@@ -32,7 +31,7 @@ use std::thread;
 use std::vec::Vec;
 use virtio_bindings::bindings::virtio_net::*;
 use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
-use vm_memory::{ByteValued, GuestMemoryMmap};
+use vm_memory::{ByteValued, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
 use vmm_sys_util::eventfd::EventFd;
 
 #[derive(Debug)]
@@ -44,7 +43,7 @@ pub enum Error {
 pub type Result<T> = result::Result<T, Error>;
 
 struct NetEpollHandler {
-    mem: Arc<ArcSwap<GuestMemoryMmap>>,
+    mem: GuestMemoryAtomic<GuestMemoryMmap>,
     tap: Tap,
     rx: RxVirtio,
     tx: TxVirtio,
@@ -69,7 +68,7 @@ impl NetEpollHandler {
     // 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, mut queue: &mut Queue) -> bool {
-        let mem = self.mem.load();
+        let mem = self.mem.memory();
         let next_desc = queue.iter(&mem).next();
 
         if next_desc.is_none() {
@@ -142,7 +141,7 @@ impl NetEpollHandler {
     }
 
     fn process_tx(&mut self, mut queue: &mut Queue) -> result::Result<(), DeviceError> {
-        let mem = self.mem.load();
+        let mem = self.mem.memory();
 
         self.tx.process_desc_chain(&mem, &mut self.tap, &mut queue);
 
@@ -273,6 +272,8 @@ impl NetEpollHandler {
                         break 'epoll;
                     }
                     PAUSE_EVENT => {
+                        // Drain pause event
+                        let _ = self.pause_evt.read();
                         debug!("PAUSE_EVENT received, pausing virtio-net epoll loop");
                         // We loop here to handle spurious park() returns.
                         // Until we have not resumed, the paused boolean will
@@ -432,7 +433,7 @@ impl VirtioDevice for Net {
 
     fn activate(
         &mut self,
-        mem: Arc<ArcSwap<GuestMemoryMmap>>,
+        mem: GuestMemoryAtomic<GuestMemoryMmap>,
         interrupt_cb: Arc<dyn VirtioInterrupt>,
         mut queues: Vec<Queue>,
         mut queue_evts: Vec<EventFd>,

vm-virtio/src/net_util.rs

@@ -4,17 +4,21 @@
 
 use super::Error as DeviceError;
 use super::{DescriptorChain, DeviceEventT, Queue};
-use arc_swap::ArcSwap;
 use net_util::{MacAddr, Tap, TapError};
 use std::cmp;
+use std::fs;
 use std::io::{self, Write};
 use std::mem;
 use std::net::Ipv4Addr;
 use std::os::unix::io::{AsRawFd, RawFd};
+use std::path::Path;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::Arc;
 use virtio_bindings::bindings::virtio_net::*;
-use vm_memory::{ByteValued, Bytes, GuestAddress, GuestMemoryError, GuestMemoryMmap};
+use vm_memory::{
+    ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryError,
+    GuestMemoryMmap,
+};
 use vmm_sys_util::eventfd::EventFd;
 
 type Result<T> = std::result::Result<T, Error>;
@@ -58,6 +62,8 @@ unsafe impl ByteValued for VirtioNetConfig {}
 
 #[derive(Debug)]
 pub enum Error {
+    /// Failed to convert an hexadecimal string into an integer.
+    ConvertHexStringToInt(std::num::ParseIntError),
     /// Read process MQ.
     FailedProcessMQ,
     /// Read queue failed.
@@ -70,10 +76,14 @@ pub enum Error {
     InvalidDesc,
     /// Invalid queue pairs number
     InvalidQueuePairsNum,
+    /// Error related to the multiqueue support.
+    MultiQueueSupport(String),
     /// No memory passed in.
     NoMemory,
     /// No ueue pairs nummber.
     NoQueuePairsNum,
+    /// Failed to read the TAP flags from sysfs.
+    ReadSysfsTunFlags(io::Error),
     /// Open tap device failed.
     TapOpen(TapError),
     /// Setting tap IP failed.
@@ -195,7 +205,7 @@ pub fn unregister_listener(
 }
 
 pub struct NetCtrlEpollHandler {
-    pub mem: Arc<ArcSwap<GuestMemoryMmap>>,
+    pub mem: GuestMemoryAtomic<GuestMemoryMmap>,
     pub kill_evt: EventFd,
     pub pause_evt: EventFd,
     pub ctrl_q: CtrlVirtio,
@@ -247,7 +257,7 @@ impl NetCtrlEpollHandler {
 
                 match ev_type {
                     CTRL_QUEUE_EVENT => {
-                        let mem = self.mem.load();
+                        let mem = self.mem.memory();
                         if let Err(e) = self.ctrl_q.queue_evt.read() {
                             error!("failed to get ctl queue event: {:?}", e);
                         }
@@ -259,6 +269,8 @@ impl NetCtrlEpollHandler {
                         break 'epoll;
                     }
                     PAUSE_EVENT => {
+                        // Drain pause event
+                        let _ = self.pause_evt.read();
                         debug!("PAUSE_EVENT received, pausing vhost-user epoll loop");
                         // We loop here to handle spurious park() returns.
                         // Until we have not resumed, the paused boolean will
@@ -452,6 +464,30 @@ fn vnet_hdr_len() -> usize {
     mem::size_of::<virtio_net_hdr_v1>()
 }
 
+fn check_mq_support(if_name: &Option<&str>, queue_pairs: usize) -> Result<()> {
+    if let Some(tap_name) = if_name {
+        let mq = queue_pairs > 1;
+        let path = format!("/sys/class/net/{}/tun_flags", tap_name);
+        // interface does not exist, check is not required
+        if !Path::new(&path).exists() {
+            return Ok(());
+        }
+        let tun_flags_str = fs::read_to_string(path).map_err(Error::ReadSysfsTunFlags)?;
+        let tun_flags = u32::from_str_radix(tun_flags_str.trim().trim_start_matches("0x"), 16)
+            .map_err(Error::ConvertHexStringToInt)?;
+        if (tun_flags & net_gen::IFF_MULTI_QUEUE != 0) && !mq {
+            return Err(Error::MultiQueueSupport(String::from(
+                "TAP interface supports MQ while device does not",
+            )));
+        } else if (tun_flags & net_gen::IFF_MULTI_QUEUE == 0) && mq {
+            return Err(Error::MultiQueueSupport(String::from(
+                "Device supports MQ while TAP interface does not",
+            )));
+        }
+    }
+    Ok(())
+}
+
 /// Create a new virtio network device with the given IP address and
 /// netmask.
 pub fn open_tap(
@@ -465,6 +501,13 @@ pub fn open_tap(
     let vnet_hdr_size = vnet_hdr_len() as i32;
     let flag = net_gen::TUN_F_CSUM | net_gen::TUN_F_UFO | net_gen::TUN_F_TSO4 | net_gen::TUN_F_TSO6;
 
+    // In case the tap interface already exists, check if the number of
+    // queues is appropriate. The tap might not support multiqueue while
+    // the number of queues indicates the user expects multiple queues, or
+    // on the contrary, the tap might support multiqueue while the number
+    // of queues indicates the user doesn't expect multiple queues.
+    check_mq_support(&if_name, num_rx_q)?;
+
     for i in 0..num_rx_q {
         let tap: Tap;
         if i == 0 {

vm-virtio/src/pmem.rs

@@ -12,7 +12,6 @@ use super::{
     VirtioDeviceType, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_VERSION_1,
 };
 use crate::{VirtioInterrupt, VirtioInterruptType};
-use arc_swap::ArcSwap;
 use epoll;
 use libc::EFD_NONBLOCK;
 use std::cmp;
@@ -27,7 +26,8 @@ use std::sync::Arc;
 use std::thread;
 use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
 use vm_memory::{
-    Address, ByteValued, Bytes, GuestAddress, GuestMemoryError, GuestMemoryMmap, GuestUsize,
+    Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
+    GuestMemoryError, GuestMemoryMmap, GuestUsize,
 };
 use vmm_sys_util::eventfd::EventFd;
 
@@ -158,7 +158,7 @@ impl Request {
 
 struct PmemEpollHandler {
     queue: Queue,
-    mem: Arc<ArcSwap<GuestMemoryMmap>>,
+    mem: GuestMemoryAtomic<GuestMemoryMmap>,
     disk: File,
     interrupt_cb: Arc<dyn VirtioInterrupt>,
     queue_evt: EventFd,
@@ -170,7 +170,7 @@ impl PmemEpollHandler {
     fn process_queue(&mut self) -> bool {
         let mut used_desc_heads = [(0, 0); QUEUE_SIZE as usize];
         let mut used_count = 0;
-        let mem = self.mem.load();
+        let mem = self.mem.memory();
         for avail_desc in self.queue.iter(&mem) {
             let len = match Request::parse(&avail_desc, &mem) {
                 Ok(ref req) if (req.type_ == RequestType::Flush) => {
@@ -290,6 +290,8 @@ impl PmemEpollHandler {
                         break 'epoll;
                     }
                     PAUSE_EVENT => {
+                        // Drain pause event
+                        let _ = self.pause_evt.read();
                         debug!("PAUSE_EVENT received, pausing virtio-pmem epoll loop");
                         // We loop here to handle spurious park() returns.
                         // Until we have not resumed, the paused boolean will
@@ -406,7 +408,7 @@ impl VirtioDevice for Pmem {
 
     fn activate(
         &mut self,
-        mem: Arc<ArcSwap<GuestMemoryMmap>>,
+        mem: GuestMemoryAtomic<GuestMemoryMmap>,
         interrupt_cb: Arc<dyn VirtioInterrupt>,
         mut queues: Vec<Queue>,
         mut queue_evts: Vec<EventFd>,