mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2026-08-05 02:19:16 +00:00
1237 lines
39 KiB
Rust
Executable File
1237 lines
39 KiB
Rust
Executable File
// Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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//
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// Portions Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE-BSD-3-Clause file.
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//
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// Copyright © 2019 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
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//
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extern crate arch;
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extern crate devices;
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extern crate epoll;
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extern crate kvm_ioctls;
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extern crate libc;
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extern crate linux_loader;
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extern crate net_util;
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extern crate vm_allocator;
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extern crate vm_memory;
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extern crate vm_virtio;
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extern crate vmm_sys_util;
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use crate::config::VmConfig;
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use devices::ioapic;
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use kvm_bindings::{
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kvm_enable_cap, kvm_msi, kvm_pit_config, kvm_userspace_memory_region, KVM_CAP_SPLIT_IRQCHIP,
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KVM_PIT_SPEAKER_DUMMY,
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};
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use kvm_ioctls::*;
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use libc::{c_void, siginfo_t, EFD_NONBLOCK};
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use linux_loader::loader::KernelLoader;
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use net_util::Tap;
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use pci::{
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InterruptDelivery, InterruptParameters, PciConfigIo, PciDevice, PciInterruptPin, PciRoot,
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};
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use qcow::{self, ImageType, QcowFile};
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use std::ffi::CString;
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use std::fs::{File, OpenOptions};
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use std::io::{self, stdout};
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use std::os::unix::io::{AsRawFd, RawFd};
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use std::sync::{Arc, Barrier, Mutex};
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use std::{result, str, thread};
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use vm_allocator::SystemAllocator;
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use vm_memory::{
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Address, Bytes, Error as MmapError, GuestAddress, GuestMemory, GuestMemoryMmap,
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GuestMemoryRegion, GuestUsize,
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};
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use vm_virtio::transport::VirtioPciDevice;
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use vmm_sys_util::signal::register_signal_handler;
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use vmm_sys_util::terminal::Terminal;
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use vmm_sys_util::EventFd;
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const VCPU_RTSIG_OFFSET: i32 = 0;
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const X86_64_IRQ_BASE: u32 = 5;
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const DEFAULT_MSIX_VEC_NUM: u16 = 2;
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// CPUID feature bits
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const TSC_DEADLINE_TIMER_ECX_BIT: u8 = 24; // tsc deadline timer ecx bit.
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const HYPERVISOR_ECX_BIT: u8 = 31; // Hypervisor ecx bit.
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// 64 bit direct boot entry offset for bzImage
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const KERNEL_64BIT_ENTRY_OFFSET: u64 = 0x200;
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/// Errors associated with VM management
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#[derive(Debug)]
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pub enum Error {
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/// Cannot open the VM file descriptor.
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VmFd(io::Error),
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/// Cannot create the KVM instance
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VmCreate(io::Error),
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/// Cannot set the VM up
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VmSetup(io::Error),
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/// Cannot open the kernel image
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KernelFile(io::Error),
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/// Mmap backed guest memory error
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GuestMemory(MmapError),
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/// Cannot load the kernel in memory
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KernelLoad(linux_loader::loader::Error),
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/// Cannot load the command line in memory
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CmdLine,
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/// Cannot open the VCPU file descriptor.
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VcpuFd(io::Error),
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/// Cannot run the VCPUs.
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VcpuRun(io::Error),
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/// Cannot spawn a new vCPU thread.
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VcpuSpawn(io::Error),
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#[cfg(target_arch = "x86_64")]
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/// Cannot set the local interruption due to bad configuration.
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LocalIntConfiguration(arch::x86_64::interrupts::Error),
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#[cfg(target_arch = "x86_64")]
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/// Error configuring the MSR registers
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MSRSConfiguration(arch::x86_64::regs::Error),
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#[cfg(target_arch = "x86_64")]
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/// Error configuring the general purpose registers
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REGSConfiguration(arch::x86_64::regs::Error),
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#[cfg(target_arch = "x86_64")]
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/// Error configuring the special registers
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SREGSConfiguration(arch::x86_64::regs::Error),
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#[cfg(target_arch = "x86_64")]
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/// Error configuring the floating point related registers
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FPUConfiguration(arch::x86_64::regs::Error),
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/// The call to KVM_SET_CPUID2 failed.
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SetSupportedCpusFailed(io::Error),
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/// Cannot create a device manager.
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DeviceManager(DeviceManagerError),
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/// Cannot create EventFd.
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EventFd(io::Error),
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/// Cannot add legacy device to Bus.
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BusError(devices::BusError),
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/// Cannot create epoll context.
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EpollError(io::Error),
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/// Write to the serial console failed.
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Serial(vmm_sys_util::Error),
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/// Cannot setup terminal in raw mode.
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SetTerminalRaw(vmm_sys_util::Error),
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/// Cannot setup terminal in canonical mode.
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SetTerminalCanon(vmm_sys_util::Error),
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/// Cannot create the system allocator
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CreateSystemAllocator,
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/// Failed parsing network parameters
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ParseNetworkParameters,
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/// Unexpected KVM_RUN exit reason
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VcpuUnhandledKvmExit,
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/// Memory is overflow
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MemOverflow,
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}
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pub type Result<T> = result::Result<T, Error>;
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/// Errors associated with device manager
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#[derive(Debug)]
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pub enum DeviceManagerError {
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/// Cannot create EventFd.
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EventFd(io::Error),
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/// Cannot open disk path
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Disk(io::Error),
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/// Cannot create virtio-blk device
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CreateVirtioBlock(io::Error),
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/// Cannot create virtio-net device
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CreateVirtioNet(vm_virtio::net::Error),
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/// Cannot create virtio-rng device
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CreateVirtioRng(io::Error),
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/// Failed parsing disk image format
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DetectImageType(qcow::Error),
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/// Cannot open qcow disk path
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QcowDeviceCreate(qcow::Error),
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/// Cannot open tap interface
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OpenTap(net_util::TapError),
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/// Cannot allocate IRQ.
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AllocateIrq,
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/// Cannot configure the IRQ.
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Irq(io::Error),
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/// Cannot allocate PCI BARs
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AllocateBars(pci::PciDeviceError),
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/// Cannot register ioevent.
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RegisterIoevent(io::Error),
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/// Cannot create virtio device
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VirtioDevice(vmm_sys_util::Error),
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/// Cannot add PCI device
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AddPciDevice(pci::PciRootError),
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}
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pub type DeviceManagerResult<T> = result::Result<T, DeviceManagerError>;
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#[allow(dead_code)]
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#[derive(Copy, Clone)]
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enum CpuidReg {
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EAX,
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EBX,
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ECX,
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EDX,
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}
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struct CpuidPatch {
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function: u32,
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index: u32,
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flags_bit: Option<u8>,
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eax_bit: Option<u8>,
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ebx_bit: Option<u8>,
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ecx_bit: Option<u8>,
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edx_bit: Option<u8>,
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}
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impl CpuidPatch {
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fn set_cpuid_reg(
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cpuid: &mut CpuId,
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function: u32,
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index: Option<u32>,
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reg: CpuidReg,
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value: u32,
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) {
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let entries = cpuid.mut_entries_slice();
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for entry in entries.iter_mut() {
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if entry.function == function && (index == None || index.unwrap() == entry.index) {
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match reg {
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CpuidReg::EAX => {
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entry.eax = value;
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}
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CpuidReg::EBX => {
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entry.ebx = value;
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}
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CpuidReg::ECX => {
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entry.ecx = value;
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}
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CpuidReg::EDX => {
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entry.edx = value;
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}
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}
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}
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}
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}
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fn patch_cpuid(cpuid: &mut CpuId, patches: Vec<CpuidPatch>) {
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let entries = cpuid.mut_entries_slice();
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for entry in entries.iter_mut() {
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for patch in patches.iter() {
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if entry.function == patch.function && entry.index == patch.index {
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if let Some(flags_bit) = patch.flags_bit {
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entry.flags |= 1 << flags_bit;
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}
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if let Some(eax_bit) = patch.eax_bit {
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entry.eax |= 1 << eax_bit;
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}
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if let Some(ebx_bit) = patch.ebx_bit {
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entry.ebx |= 1 << ebx_bit;
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}
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if let Some(ecx_bit) = patch.ecx_bit {
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entry.ecx |= 1 << ecx_bit;
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}
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if let Some(edx_bit) = patch.edx_bit {
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entry.edx |= 1 << edx_bit;
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}
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}
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}
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}
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}
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}
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/// A wrapper around creating and using a kvm-based VCPU.
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pub struct Vcpu {
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fd: VcpuFd,
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id: u8,
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io_bus: devices::Bus,
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mmio_bus: devices::Bus,
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ioapic: Option<Arc<Mutex<ioapic::Ioapic>>>,
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}
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impl Vcpu {
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/// Constructs a new VCPU for `vm`.
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///
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/// # Arguments
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///
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/// * `id` - Represents the CPU number between [0, max vcpus).
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/// * `vm` - The virtual machine this vcpu will get attached to.
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pub fn new(
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id: u8,
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vm: &Vm,
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io_bus: devices::Bus,
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mmio_bus: devices::Bus,
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ioapic: Option<Arc<Mutex<ioapic::Ioapic>>>,
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) -> Result<Self> {
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let kvm_vcpu = vm.fd.create_vcpu(id).map_err(Error::VcpuFd)?;
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// Initially the cpuid per vCPU is the one supported by this VM.
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Ok(Vcpu {
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fd: kvm_vcpu,
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id,
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io_bus,
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mmio_bus,
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ioapic,
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})
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}
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/// Configures a x86_64 specific vcpu and should be called once per vcpu from the vcpu's thread.
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///
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/// # Arguments
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///
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/// * `machine_config` - Specifies necessary info used for the CPUID configuration.
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/// * `kernel_start_addr` - Offset from `guest_mem` at which the kernel starts.
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/// * `vm` - The virtual machine this vcpu will get attached to.
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pub fn configure(&mut self, kernel_start_addr: GuestAddress, vm: &Vm) -> Result<()> {
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let mut cpuid = vm.cpuid.clone();
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CpuidPatch::set_cpuid_reg(&mut cpuid, 0xb, None, CpuidReg::EDX, u32::from(self.id));
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self.fd
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.set_cpuid2(&cpuid)
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.map_err(Error::SetSupportedCpusFailed)?;
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arch::x86_64::regs::setup_msrs(&self.fd).map_err(Error::MSRSConfiguration)?;
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// Safe to unwrap because this method is called after the VM is configured
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let vm_memory = vm.get_memory();
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arch::x86_64::regs::setup_regs(
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&self.fd,
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kernel_start_addr.raw_value(),
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arch::x86_64::layout::BOOT_STACK_POINTER.raw_value(),
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arch::x86_64::layout::ZERO_PAGE_START.raw_value(),
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)
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.map_err(Error::REGSConfiguration)?;
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arch::x86_64::regs::setup_fpu(&self.fd).map_err(Error::FPUConfiguration)?;
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arch::x86_64::regs::setup_sregs(vm_memory, &self.fd).map_err(Error::SREGSConfiguration)?;
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arch::x86_64::interrupts::set_lint(&self.fd).map_err(Error::LocalIntConfiguration)?;
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Ok(())
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}
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/// Runs the VCPU until it exits, returning the reason.
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///
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/// Note that the state of the VCPU and associated VM must be setup first for this to do
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/// anything useful.
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pub fn run(&self) -> Result<()> {
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match self.fd.run() {
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Ok(run) => match run {
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VcpuExit::IoIn(addr, data) => {
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self.io_bus.read(u64::from(addr), data);
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Ok(())
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}
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VcpuExit::IoOut(addr, data) => {
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self.io_bus.write(u64::from(addr), data);
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Ok(())
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}
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VcpuExit::MmioRead(addr, data) => {
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self.mmio_bus.read(addr as u64, data);
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Ok(())
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}
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VcpuExit::MmioWrite(addr, data) => {
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self.mmio_bus.write(addr as u64, data);
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Ok(())
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}
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VcpuExit::IoapicEoi(vector) => {
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if let Some(ioapic) = &self.ioapic {
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ioapic.lock().unwrap().end_of_interrupt(vector);
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}
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Ok(())
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}
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r => {
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error!("Unexpected exit reason on vcpu run: {:?}", r);
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Err(Error::VcpuUnhandledKvmExit)
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}
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},
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Err(ref e) => match e.raw_os_error().unwrap() {
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libc::EAGAIN | libc::EINTR => Ok(()),
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_ => {
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error!("VCPU {:?} error {:?}", self.id, e);
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Err(Error::VcpuUnhandledKvmExit)
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}
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},
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}
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}
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}
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struct InterruptInfo<'a> {
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msi_capable: bool,
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ioapic: &'a Option<Arc<Mutex<ioapic::Ioapic>>>,
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}
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struct KernelIoapicIrq {
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evt: EventFd,
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}
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impl KernelIoapicIrq {
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fn new(evt: EventFd) -> Self {
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KernelIoapicIrq { evt }
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}
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}
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impl devices::Interrupt for KernelIoapicIrq {
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fn deliver(&self) -> result::Result<(), io::Error> {
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self.evt.write(1)
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}
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}
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struct UserIoapicIrq {
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ioapic: Arc<Mutex<ioapic::Ioapic>>,
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irq: usize,
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}
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impl UserIoapicIrq {
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fn new(ioapic: Arc<Mutex<ioapic::Ioapic>>, irq: usize) -> Self {
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UserIoapicIrq { ioapic, irq }
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}
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}
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impl devices::Interrupt for UserIoapicIrq {
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fn deliver(&self) -> result::Result<(), io::Error> {
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self.ioapic
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.lock()
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.unwrap()
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.service_irq(self.irq)
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.map_err(|e| {
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std::io::Error::new(
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std::io::ErrorKind::Other,
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format!("failed to inject IRQ #{}: {:?}", self.irq, e),
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)
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})
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}
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}
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struct DeviceManager {
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io_bus: devices::Bus,
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mmio_bus: devices::Bus,
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// Serial port on 0x3f8
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serial: Arc<Mutex<devices::legacy::Serial>>,
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// i8042 device for exit
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i8042: Arc<Mutex<devices::legacy::I8042Device>>,
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exit_evt: EventFd,
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// IOAPIC
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ioapic: Option<Arc<Mutex<ioapic::Ioapic>>>,
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// PCI root
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pci: Arc<Mutex<PciConfigIo>>,
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}
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impl DeviceManager {
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fn new(
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memory: GuestMemoryMmap,
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allocator: &mut SystemAllocator,
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vm_fd: &Arc<VmFd>,
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vm_cfg: &VmConfig,
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msi_capable: bool,
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userspace_ioapic: bool,
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) -> DeviceManagerResult<Self> {
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let io_bus = devices::Bus::new();
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let mut mmio_bus = devices::Bus::new();
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let ioapic = if userspace_ioapic {
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// Create IOAPIC
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Some(Arc::new(Mutex::new(ioapic::Ioapic::new(vm_fd.clone()))))
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} else {
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None
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};
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let interrupt_info = InterruptInfo {
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msi_capable,
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ioapic: &ioapic,
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};
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// Serial is tied to IRQ #4
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let serial_irq = 4;
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let interrupt: Box<devices::Interrupt> = if let Some(ioapic) = &ioapic {
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Box::new(UserIoapicIrq::new(ioapic.clone(), serial_irq))
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} else {
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let serial_evt = EventFd::new(EFD_NONBLOCK).map_err(DeviceManagerError::EventFd)?;
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vm_fd
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.register_irqfd(serial_evt.as_raw_fd(), serial_irq as u32)
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.map_err(DeviceManagerError::Irq)?;
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Box::new(KernelIoapicIrq::new(serial_evt))
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};
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// Add serial device
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let serial = Arc::new(Mutex::new(devices::legacy::Serial::new_out(
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interrupt,
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Box::new(stdout()),
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)));
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// Add a shutdown device (i8042)
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let exit_evt = EventFd::new(EFD_NONBLOCK).map_err(DeviceManagerError::EventFd)?;
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let i8042 = Arc::new(Mutex::new(devices::legacy::I8042Device::new(
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exit_evt.try_clone().map_err(DeviceManagerError::EventFd)?,
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)));
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let mut pci_root = PciRoot::new(None);
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for disk_cfg in &vm_cfg.disks {
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// Open block device path
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let raw_img: File = OpenOptions::new()
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.read(true)
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.write(true)
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.open(disk_cfg.path)
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.map_err(DeviceManagerError::Disk)?;
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// Add virtio-blk
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let image_type =
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qcow::detect_image_type(&raw_img).map_err(DeviceManagerError::DetectImageType)?;
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let block = match image_type {
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ImageType::Raw => {
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let raw_img = vm_virtio::RawFile::new(raw_img);
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let dev = vm_virtio::Block::new(raw_img, disk_cfg.path.to_path_buf(), false)
|
|
.map_err(DeviceManagerError::CreateVirtioBlock)?;
|
|
Box::new(dev) as Box<vm_virtio::VirtioDevice>
|
|
}
|
|
ImageType::Qcow2 => {
|
|
let qcow_img =
|
|
QcowFile::from(raw_img).map_err(DeviceManagerError::QcowDeviceCreate)?;
|
|
let dev = vm_virtio::Block::new(qcow_img, disk_cfg.path.to_path_buf(), false)
|
|
.map_err(DeviceManagerError::CreateVirtioBlock)?;
|
|
Box::new(dev) as Box<vm_virtio::VirtioDevice>
|
|
}
|
|
};
|
|
|
|
DeviceManager::add_virtio_pci_device(
|
|
block,
|
|
memory.clone(),
|
|
allocator,
|
|
vm_fd,
|
|
&mut pci_root,
|
|
&mut mmio_bus,
|
|
&interrupt_info,
|
|
)?;
|
|
}
|
|
|
|
// Add virtio-net if required
|
|
if let Some(net_cfg) = &vm_cfg.net {
|
|
let mut virtio_net_device: vm_virtio::Net;
|
|
|
|
if let Some(tap_if_name) = net_cfg.tap {
|
|
let tap = Tap::open_named(tap_if_name).map_err(DeviceManagerError::OpenTap)?;
|
|
virtio_net_device = vm_virtio::Net::new_with_tap(tap, Some(&net_cfg.mac))
|
|
.map_err(DeviceManagerError::CreateVirtioNet)?;
|
|
} else {
|
|
virtio_net_device =
|
|
vm_virtio::Net::new(net_cfg.ip, net_cfg.mask, Some(&net_cfg.mac))
|
|
.map_err(DeviceManagerError::CreateVirtioNet)?;
|
|
}
|
|
|
|
DeviceManager::add_virtio_pci_device(
|
|
Box::new(virtio_net_device),
|
|
memory.clone(),
|
|
allocator,
|
|
vm_fd,
|
|
&mut pci_root,
|
|
&mut mmio_bus,
|
|
&interrupt_info,
|
|
)?;
|
|
}
|
|
|
|
// Add virtio-rng if required
|
|
if let Some(rng_path) = vm_cfg.rng.src.to_str() {
|
|
println!("VIRTIO_RNG PATH {}", rng_path);
|
|
let virtio_rng_device =
|
|
vm_virtio::Rng::new(rng_path).map_err(DeviceManagerError::CreateVirtioRng)?;
|
|
|
|
DeviceManager::add_virtio_pci_device(
|
|
Box::new(virtio_rng_device),
|
|
memory.clone(),
|
|
allocator,
|
|
vm_fd,
|
|
&mut pci_root,
|
|
&mut mmio_bus,
|
|
&interrupt_info,
|
|
)?;
|
|
}
|
|
|
|
let pci = Arc::new(Mutex::new(PciConfigIo::new(pci_root)));
|
|
|
|
Ok(DeviceManager {
|
|
io_bus,
|
|
mmio_bus,
|
|
serial,
|
|
i8042,
|
|
exit_evt,
|
|
ioapic,
|
|
pci,
|
|
})
|
|
}
|
|
|
|
fn add_virtio_pci_device(
|
|
virtio_device: Box<vm_virtio::VirtioDevice>,
|
|
memory: GuestMemoryMmap,
|
|
allocator: &mut SystemAllocator,
|
|
vm_fd: &Arc<VmFd>,
|
|
pci_root: &mut PciRoot,
|
|
mmio_bus: &mut devices::Bus,
|
|
interrupt_info: &InterruptInfo,
|
|
) -> DeviceManagerResult<()> {
|
|
let msix_num = if interrupt_info.msi_capable {
|
|
DEFAULT_MSIX_VEC_NUM
|
|
} else {
|
|
0
|
|
};
|
|
|
|
let mut virtio_pci_device = VirtioPciDevice::new(memory, virtio_device, msix_num)
|
|
.map_err(DeviceManagerError::VirtioDevice)?;
|
|
|
|
let bars = virtio_pci_device
|
|
.allocate_bars(allocator)
|
|
.map_err(DeviceManagerError::AllocateBars)?;
|
|
|
|
for (event, addr, _) in virtio_pci_device.ioeventfds() {
|
|
let io_addr = IoEventAddress::Mmio(addr);
|
|
vm_fd
|
|
.register_ioevent(event.as_raw_fd(), &io_addr, NoDatamatch)
|
|
.map_err(DeviceManagerError::RegisterIoevent)?;
|
|
}
|
|
|
|
if interrupt_info.msi_capable {
|
|
let vm_fd_clone = vm_fd.clone();
|
|
|
|
let msi_cb = Arc::new(Box::new(move |p: InterruptParameters| {
|
|
if let Some(entry) = p.msix {
|
|
let msi_queue = kvm_msi {
|
|
address_lo: entry.msg_addr_lo,
|
|
address_hi: entry.msg_addr_hi,
|
|
data: entry.msg_data,
|
|
flags: 0u32,
|
|
devid: 0u32,
|
|
pad: [0u8; 12],
|
|
};
|
|
|
|
return vm_fd_clone.signal_msi(msi_queue).map(|ret| {
|
|
if ret > 0 {
|
|
debug!("MSI message successfully delivered");
|
|
} else if ret == 0 {
|
|
warn!("failed to deliver MSI message, blocked by guest");
|
|
}
|
|
});
|
|
}
|
|
|
|
Err(std::io::Error::new(
|
|
std::io::ErrorKind::Other,
|
|
"missing MSI-X entry",
|
|
))
|
|
}) as InterruptDelivery);
|
|
|
|
virtio_pci_device.assign_msix(msi_cb);
|
|
} else {
|
|
let irq_num = allocator
|
|
.allocate_irq()
|
|
.ok_or(DeviceManagerError::AllocateIrq)?;
|
|
|
|
let irq_cb = if let Some(ioapic) = interrupt_info.ioapic {
|
|
let ioapic_clone = ioapic.clone();
|
|
Box::new(move |_p: InterruptParameters| {
|
|
ioapic_clone
|
|
.lock()
|
|
.unwrap()
|
|
.service_irq(irq_num as usize)
|
|
.map_err(|e| {
|
|
std::io::Error::new(
|
|
std::io::ErrorKind::Other,
|
|
format!("failed to inject IRQ #{}: {:?}", irq_num, e),
|
|
)
|
|
})
|
|
}) as InterruptDelivery
|
|
} else {
|
|
let irqfd = EventFd::new(EFD_NONBLOCK).map_err(DeviceManagerError::EventFd)?;
|
|
vm_fd
|
|
.register_irqfd(irqfd.as_raw_fd(), irq_num)
|
|
.map_err(DeviceManagerError::Irq)?;
|
|
|
|
Box::new(move |_p: InterruptParameters| irqfd.write(1)) as InterruptDelivery
|
|
};
|
|
|
|
virtio_pci_device.assign_pin_irq(
|
|
Arc::new(irq_cb),
|
|
irq_num as u32,
|
|
PciInterruptPin::IntA,
|
|
);
|
|
}
|
|
|
|
let virtio_pci_device = Arc::new(Mutex::new(virtio_pci_device));
|
|
|
|
pci_root
|
|
.add_device(virtio_pci_device.clone())
|
|
.map_err(DeviceManagerError::AddPciDevice)?;
|
|
|
|
pci_root
|
|
.register_mapping(virtio_pci_device.clone(), mmio_bus, bars)
|
|
.map_err(DeviceManagerError::AddPciDevice)?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub fn register_devices(&mut self) -> Result<()> {
|
|
// Insert serial device
|
|
self.io_bus
|
|
.insert(self.serial.clone(), 0x3f8, 0x8)
|
|
.map_err(Error::BusError)?;
|
|
|
|
// Insert i8042 device
|
|
self.io_bus
|
|
.insert(self.i8042.clone(), 0x61, 0x4)
|
|
.map_err(Error::BusError)?;
|
|
|
|
// Insert the PCI root configuration space.
|
|
self.io_bus
|
|
.insert(self.pci.clone(), 0xcf8, 0x8)
|
|
.map_err(Error::BusError)?;
|
|
|
|
if let Some(ioapic) = &self.ioapic {
|
|
// Insert IOAPIC
|
|
self.mmio_bus
|
|
.insert(ioapic.clone(), 0xfec0_0000, 0x20)
|
|
.map_err(Error::BusError)?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
#[derive(Debug, Clone, Copy, PartialEq)]
|
|
enum EpollDispatch {
|
|
Exit,
|
|
Stdin,
|
|
}
|
|
|
|
pub struct EpollContext {
|
|
raw_fd: RawFd,
|
|
dispatch_table: Vec<Option<EpollDispatch>>,
|
|
}
|
|
|
|
impl EpollContext {
|
|
pub fn new() -> result::Result<EpollContext, io::Error> {
|
|
let raw_fd = epoll::create(true)?;
|
|
|
|
// Initial capacity needs to be large enough to hold:
|
|
// * 1 exit event
|
|
// * 1 stdin event
|
|
let mut dispatch_table = Vec::with_capacity(3);
|
|
dispatch_table.push(None);
|
|
|
|
Ok(EpollContext {
|
|
raw_fd,
|
|
dispatch_table,
|
|
})
|
|
}
|
|
|
|
pub fn add_stdin(&mut self) -> result::Result<(), io::Error> {
|
|
let dispatch_index = self.dispatch_table.len() as u64;
|
|
epoll::ctl(
|
|
self.raw_fd,
|
|
epoll::ControlOptions::EPOLL_CTL_ADD,
|
|
libc::STDIN_FILENO,
|
|
epoll::Event::new(epoll::Events::EPOLLIN, dispatch_index),
|
|
)?;
|
|
|
|
self.dispatch_table.push(Some(EpollDispatch::Stdin));
|
|
|
|
Ok(())
|
|
}
|
|
|
|
fn add_event<T>(&mut self, fd: &T, token: EpollDispatch) -> result::Result<(), io::Error>
|
|
where
|
|
T: AsRawFd,
|
|
{
|
|
let dispatch_index = self.dispatch_table.len() as u64;
|
|
epoll::ctl(
|
|
self.raw_fd,
|
|
epoll::ControlOptions::EPOLL_CTL_ADD,
|
|
fd.as_raw_fd(),
|
|
epoll::Event::new(epoll::Events::EPOLLIN, dispatch_index),
|
|
)?;
|
|
self.dispatch_table.push(Some(token));
|
|
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
impl AsRawFd for EpollContext {
|
|
fn as_raw_fd(&self) -> RawFd {
|
|
self.raw_fd
|
|
}
|
|
}
|
|
|
|
pub struct Vm<'a> {
|
|
fd: Arc<VmFd>,
|
|
kernel: File,
|
|
memory: GuestMemoryMmap,
|
|
vcpus: Vec<thread::JoinHandle<()>>,
|
|
devices: DeviceManager,
|
|
cpuid: CpuId,
|
|
config: VmConfig<'a>,
|
|
epoll: EpollContext,
|
|
on_tty: bool,
|
|
}
|
|
|
|
impl<'a> Vm<'a> {
|
|
pub fn new(kvm: &Kvm, config: VmConfig<'a>) -> Result<Self> {
|
|
let kernel = File::open(&config.kernel.path).map_err(Error::KernelFile)?;
|
|
let fd = kvm.create_vm().map_err(Error::VmCreate)?;
|
|
let fd = Arc::new(fd);
|
|
|
|
// Init guest memory
|
|
let arch_mem_regions = arch::arch_memory_regions(u64::from(&config.memory) << 20);
|
|
let guest_memory = GuestMemoryMmap::new(&arch_mem_regions).map_err(Error::GuestMemory)?;
|
|
|
|
guest_memory
|
|
.with_regions(|index, region| {
|
|
let mem_region = kvm_userspace_memory_region {
|
|
slot: index as u32,
|
|
guest_phys_addr: region.start_addr().raw_value(),
|
|
memory_size: region.len() as u64,
|
|
userspace_addr: region.as_ptr() as u64,
|
|
flags: 0,
|
|
};
|
|
|
|
// Safe because the guest regions are guaranteed not to overlap.
|
|
unsafe { fd.set_user_memory_region(mem_region) }
|
|
})
|
|
.map_err(|_| Error::GuestMemory(MmapError::NoMemoryRegion))?;
|
|
|
|
// Set TSS
|
|
fd.set_tss_address(arch::x86_64::layout::KVM_TSS_ADDRESS.raw_value() as usize)
|
|
.map_err(Error::VmSetup)?;
|
|
|
|
// Supported CPUID
|
|
let mut cpuid = kvm
|
|
.get_supported_cpuid(MAX_KVM_CPUID_ENTRIES)
|
|
.map_err(Error::VmSetup)?;
|
|
|
|
let msi_capable = kvm.check_extension(Cap::SignalMsi);
|
|
|
|
let mut cpuid_patches = Vec::new();
|
|
let mut userspace_ioapic = false;
|
|
if kvm.check_extension(Cap::TscDeadlineTimer) {
|
|
if kvm.check_extension(Cap::SplitIrqchip) && msi_capable {
|
|
// Create split irqchip
|
|
// Only the local APIC is emulated in kernel, both PICs and IOAPIC
|
|
// are not.
|
|
let mut cap: kvm_enable_cap = Default::default();
|
|
cap.cap = KVM_CAP_SPLIT_IRQCHIP;
|
|
cap.args[0] = ioapic::NUM_IOAPIC_PINS as u64;
|
|
fd.enable_cap(&cap).map_err(Error::VmSetup)?;
|
|
|
|
// Because of the split irqchip, we need a userspace IOAPIC.
|
|
userspace_ioapic = true;
|
|
} else {
|
|
// Create irqchip
|
|
// A local APIC, 2 PICs and an IOAPIC are emulated in kernel.
|
|
fd.create_irq_chip().map_err(Error::VmSetup)?;
|
|
}
|
|
|
|
// Patch tsc deadline timer bit
|
|
cpuid_patches.push(CpuidPatch {
|
|
function: 1,
|
|
index: 0,
|
|
flags_bit: None,
|
|
eax_bit: None,
|
|
ebx_bit: None,
|
|
ecx_bit: Some(TSC_DEADLINE_TIMER_ECX_BIT),
|
|
edx_bit: None,
|
|
});
|
|
} else {
|
|
// Create irqchip
|
|
// A local APIC, 2 PICs and an IOAPIC are emulated in kernel.
|
|
fd.create_irq_chip().map_err(Error::VmSetup)?;
|
|
// Creates an in-kernel device model for the PIT.
|
|
let mut pit_config = kvm_pit_config::default();
|
|
// We need to enable the emulation of a dummy speaker port stub so that writing to port 0x61
|
|
// (i.e. KVM_SPEAKER_BASE_ADDRESS) does not trigger an exit to user space.
|
|
pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
|
|
fd.create_pit2(pit_config).map_err(Error::VmSetup)?;
|
|
}
|
|
|
|
// Patch hypervisor bit
|
|
cpuid_patches.push(CpuidPatch {
|
|
function: 1,
|
|
index: 0,
|
|
flags_bit: None,
|
|
eax_bit: None,
|
|
ebx_bit: None,
|
|
ecx_bit: Some(HYPERVISOR_ECX_BIT),
|
|
edx_bit: None,
|
|
});
|
|
|
|
CpuidPatch::patch_cpuid(&mut cpuid, cpuid_patches);
|
|
|
|
// Let's allocate 64 GiB of addressable MMIO space, starting at 0.
|
|
let mut allocator = SystemAllocator::new(
|
|
None,
|
|
None,
|
|
GuestAddress(0),
|
|
1 << 36 as GuestUsize,
|
|
X86_64_IRQ_BASE,
|
|
)
|
|
.ok_or(Error::CreateSystemAllocator)?;
|
|
|
|
let device_manager = DeviceManager::new(
|
|
guest_memory.clone(),
|
|
&mut allocator,
|
|
&fd,
|
|
&config,
|
|
msi_capable,
|
|
userspace_ioapic,
|
|
)
|
|
.map_err(Error::DeviceManager)?;
|
|
|
|
// Let's add our STDIN fd.
|
|
let mut epoll = EpollContext::new().map_err(Error::EpollError)?;
|
|
|
|
let on_tty = unsafe { libc::isatty(libc::STDIN_FILENO as i32) } != 0;
|
|
if on_tty {
|
|
epoll.add_stdin().map_err(Error::EpollError)?;
|
|
}
|
|
|
|
// Let's add an exit event.
|
|
epoll
|
|
.add_event(&device_manager.exit_evt, EpollDispatch::Exit)
|
|
.map_err(Error::EpollError)?;
|
|
|
|
let vcpus = Vec::with_capacity(u8::from(&config.cpus) as usize);
|
|
|
|
Ok(Vm {
|
|
fd,
|
|
kernel,
|
|
memory: guest_memory,
|
|
vcpus,
|
|
devices: device_manager,
|
|
cpuid,
|
|
config,
|
|
epoll,
|
|
on_tty,
|
|
})
|
|
}
|
|
|
|
pub fn load_kernel(&mut self) -> Result<GuestAddress> {
|
|
let cmdline_cstring =
|
|
CString::new(self.config.cmdline.args.clone()).map_err(|_| Error::CmdLine)?;
|
|
let entry_addr = match linux_loader::loader::Elf::load(
|
|
&self.memory,
|
|
None,
|
|
&mut self.kernel,
|
|
Some(arch::HIMEM_START),
|
|
) {
|
|
Ok(entry_addr) => entry_addr,
|
|
Err(linux_loader::loader::Error::InvalidElfMagicNumber) => {
|
|
linux_loader::loader::BzImage::load(
|
|
&self.memory,
|
|
None,
|
|
&mut self.kernel,
|
|
Some(arch::HIMEM_START),
|
|
)
|
|
.map_err(Error::KernelLoad)?
|
|
}
|
|
_ => panic!("Invalid elf file"),
|
|
};
|
|
|
|
linux_loader::loader::load_cmdline(
|
|
&self.memory,
|
|
self.config.cmdline.offset,
|
|
&cmdline_cstring,
|
|
)
|
|
.map_err(|_| Error::CmdLine)?;
|
|
|
|
let vcpu_count = u8::from(&self.config.cpus);
|
|
|
|
match entry_addr.setup_header {
|
|
Some(hdr) => {
|
|
arch::configure_system(
|
|
&self.memory,
|
|
self.config.cmdline.offset,
|
|
cmdline_cstring.to_bytes().len() + 1,
|
|
vcpu_count,
|
|
Some(hdr),
|
|
)
|
|
.map_err(|_| Error::CmdLine)?;
|
|
|
|
let load_addr = entry_addr
|
|
.kernel_load
|
|
.raw_value()
|
|
.checked_add(KERNEL_64BIT_ENTRY_OFFSET)
|
|
.ok_or(Error::MemOverflow)?;
|
|
|
|
Ok(GuestAddress(load_addr))
|
|
}
|
|
None => {
|
|
arch::configure_system(
|
|
&self.memory,
|
|
self.config.cmdline.offset,
|
|
cmdline_cstring.to_bytes().len() + 1,
|
|
vcpu_count,
|
|
None,
|
|
)
|
|
.map_err(|_| Error::CmdLine)?;
|
|
|
|
Ok(entry_addr.kernel_load)
|
|
}
|
|
}
|
|
}
|
|
|
|
pub fn control_loop(&mut self) -> Result<()> {
|
|
// Let's start the STDIN polling thread.
|
|
const EPOLL_EVENTS_LEN: usize = 100;
|
|
|
|
let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); EPOLL_EVENTS_LEN];
|
|
let epoll_fd = self.epoll.as_raw_fd();
|
|
|
|
if self.on_tty {
|
|
io::stdin()
|
|
.lock()
|
|
.set_raw_mode()
|
|
.map_err(Error::SetTerminalRaw)?;
|
|
}
|
|
|
|
'outer: loop {
|
|
let num_events =
|
|
epoll::wait(epoll_fd, -1, &mut events[..]).map_err(Error::EpollError)?;
|
|
|
|
for event in events.iter().take(num_events) {
|
|
let dispatch_idx = event.data as usize;
|
|
|
|
if let Some(dispatch_type) = self.epoll.dispatch_table[dispatch_idx] {
|
|
match dispatch_type {
|
|
EpollDispatch::Exit => {
|
|
// Consume the event.
|
|
self.devices.exit_evt.read().map_err(Error::EventFd)?;
|
|
|
|
break 'outer;
|
|
}
|
|
EpollDispatch::Stdin => {
|
|
let mut out = [0u8; 64];
|
|
let count = io::stdin()
|
|
.lock()
|
|
.read_raw(&mut out)
|
|
.map_err(Error::Serial)?;
|
|
|
|
self.devices
|
|
.serial
|
|
.lock()
|
|
.expect("Failed to process stdin event due to poisoned lock")
|
|
.queue_input_bytes(&out[..count])
|
|
.map_err(Error::Serial)?;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if self.on_tty {
|
|
// Don't forget to set the terminal in canonical mode
|
|
// before to exit.
|
|
io::stdin()
|
|
.lock()
|
|
.set_canon_mode()
|
|
.map_err(Error::SetTerminalCanon)?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub fn start(&mut self, entry_addr: GuestAddress) -> Result<()> {
|
|
self.devices.register_devices()?;
|
|
|
|
let vcpu_count = u8::from(&self.config.cpus);
|
|
|
|
// let vcpus: Vec<thread::JoinHandle<()>> = Vec::with_capacity(vcpu_count as usize);
|
|
let vcpu_thread_barrier = Arc::new(Barrier::new((vcpu_count + 1) as usize));
|
|
|
|
for cpu_id in 0..vcpu_count {
|
|
let io_bus = self.devices.io_bus.clone();
|
|
let mmio_bus = self.devices.mmio_bus.clone();
|
|
let ioapic = if let Some(ioapic) = &self.devices.ioapic {
|
|
Some(ioapic.clone())
|
|
} else {
|
|
None
|
|
};
|
|
|
|
let mut vcpu = Vcpu::new(cpu_id, &self, io_bus, mmio_bus, ioapic)?;
|
|
vcpu.configure(entry_addr, &self)?;
|
|
|
|
let vcpu_thread_barrier = vcpu_thread_barrier.clone();
|
|
|
|
self.vcpus.push(
|
|
thread::Builder::new()
|
|
.name(format!("cloud-hypervisor_vcpu{}", vcpu.id))
|
|
.spawn(move || {
|
|
unsafe {
|
|
extern "C" fn handle_signal(_: i32, _: *mut siginfo_t, _: *mut c_void) {
|
|
}
|
|
// This uses an async signal safe handler to kill the vcpu handles.
|
|
register_signal_handler(
|
|
VCPU_RTSIG_OFFSET,
|
|
vmm_sys_util::signal::SignalHandler::Siginfo(handle_signal),
|
|
true,
|
|
0,
|
|
)
|
|
.expect("Failed to register vcpu signal handler");
|
|
}
|
|
|
|
// Block until all CPUs are ready.
|
|
vcpu_thread_barrier.wait();
|
|
|
|
while vcpu.run().is_ok() {}
|
|
})
|
|
.map_err(Error::VcpuSpawn)?,
|
|
);
|
|
}
|
|
|
|
// Unblock all CPU threads.
|
|
vcpu_thread_barrier.wait();
|
|
|
|
self.control_loop()?;
|
|
|
|
Ok(())
|
|
}
|
|
|
|
/// Gets a reference to the guest memory owned by this VM.
|
|
///
|
|
/// Note that `GuestMemory` does not include any device memory that may have been added after
|
|
/// this VM was constructed.
|
|
pub fn get_memory(&self) -> &GuestMemoryMmap {
|
|
&self.memory
|
|
}
|
|
}
|
|
|
|
#[allow(unused)]
|
|
pub fn test_vm() {
|
|
// This example based on https://lwn.net/Articles/658511/
|
|
let code = [
|
|
0xba, 0xf8, 0x03, /* mov $0x3f8, %dx */
|
|
0x00, 0xd8, /* add %bl, %al */
|
|
0x04, b'0', /* add $'0', %al */
|
|
0xee, /* out %al, (%dx) */
|
|
0xb0, b'\n', /* mov $'\n', %al */
|
|
0xee, /* out %al, (%dx) */
|
|
0xf4, /* hlt */
|
|
];
|
|
|
|
let mem_size = 0x1000;
|
|
let load_addr = GuestAddress(0x1000);
|
|
let mem = GuestMemoryMmap::new(&[(load_addr, mem_size)]).unwrap();
|
|
|
|
let kvm = Kvm::new().expect("new KVM instance creation failed");
|
|
let vm_fd = kvm.create_vm().expect("new VM fd creation failed");
|
|
|
|
mem.with_regions(|index, region| {
|
|
let mem_region = kvm_userspace_memory_region {
|
|
slot: index as u32,
|
|
guest_phys_addr: region.start_addr().raw_value(),
|
|
memory_size: region.len() as u64,
|
|
userspace_addr: region.as_ptr() as u64,
|
|
flags: 0,
|
|
};
|
|
|
|
// Safe because the guest regions are guaranteed not to overlap.
|
|
unsafe { vm_fd.set_user_memory_region(mem_region) }
|
|
})
|
|
.expect("Cannot configure guest memory");
|
|
mem.write_slice(&code, load_addr)
|
|
.expect("Writing code to memory failed");
|
|
|
|
let vcpu_fd = vm_fd.create_vcpu(0).expect("new VcpuFd failed");
|
|
|
|
let mut vcpu_sregs = vcpu_fd.get_sregs().expect("get sregs failed");
|
|
vcpu_sregs.cs.base = 0;
|
|
vcpu_sregs.cs.selector = 0;
|
|
vcpu_fd.set_sregs(&vcpu_sregs).expect("set sregs failed");
|
|
|
|
let mut vcpu_regs = vcpu_fd.get_regs().expect("get regs failed");
|
|
vcpu_regs.rip = 0x1000;
|
|
vcpu_regs.rax = 2;
|
|
vcpu_regs.rbx = 3;
|
|
vcpu_regs.rflags = 2;
|
|
vcpu_fd.set_regs(&vcpu_regs).expect("set regs failed");
|
|
|
|
loop {
|
|
match vcpu_fd.run().expect("run failed") {
|
|
VcpuExit::IoIn(addr, data) => {
|
|
println!(
|
|
"IO in -- addr: {:#x} data [{:?}]",
|
|
addr,
|
|
str::from_utf8(&data).unwrap()
|
|
);
|
|
}
|
|
VcpuExit::IoOut(addr, data) => {
|
|
println!(
|
|
"IO out -- addr: {:#x} data [{:?}]",
|
|
addr,
|
|
str::from_utf8(&data).unwrap()
|
|
);
|
|
}
|
|
VcpuExit::MmioRead(_addr, _data) => {}
|
|
VcpuExit::MmioWrite(_addr, _data) => {}
|
|
VcpuExit::Unknown => {}
|
|
VcpuExit::Exception => {}
|
|
VcpuExit::Hypercall => {}
|
|
VcpuExit::Debug => {}
|
|
VcpuExit::Hlt => {
|
|
println!("HLT");
|
|
}
|
|
VcpuExit::IrqWindowOpen => {}
|
|
VcpuExit::Shutdown => {}
|
|
VcpuExit::FailEntry => {}
|
|
VcpuExit::Intr => {}
|
|
VcpuExit::SetTpr => {}
|
|
VcpuExit::TprAccess => {}
|
|
VcpuExit::S390Sieic => {}
|
|
VcpuExit::S390Reset => {}
|
|
VcpuExit::Dcr => {}
|
|
VcpuExit::Nmi => {}
|
|
VcpuExit::InternalError => {}
|
|
VcpuExit::Osi => {}
|
|
VcpuExit::PaprHcall => {}
|
|
VcpuExit::S390Ucontrol => {}
|
|
VcpuExit::Watchdog => {}
|
|
VcpuExit::S390Tsch => {}
|
|
VcpuExit::Epr => {}
|
|
VcpuExit::SystemEvent => {}
|
|
VcpuExit::S390Stsi => {}
|
|
VcpuExit::IoapicEoi(_vector) => {}
|
|
VcpuExit::Hyperv => {}
|
|
}
|
|
// r => panic!("unexpected exit reason: {:?}", r),
|
|
}
|
|
}
|