mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-08-23 08:21:15 +00:00
When the KVM capability KVM_CAP_SIGNAL_MSI is not present, the VMM falls back from MSI-X onto pin based interrupts. Unfortunately, this was not working as expected because the VirtioPciDevice object was always creating an MSI-X capability structure in the PCI configuration space. This was causing the guest drivers to expect MSI-X interrupts instead of the pin based generated ones. This patch takes care of avoiding the creation of a dedicated MSI-X capability structure when MSI is not supported by KVM. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
954 lines
30 KiB
Rust
Executable File
954 lines
30 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 kvm_bindings::{kvm_msi, kvm_pit_config, kvm_userspace_memory_region, KVM_PIT_SPEAKER_DUMMY};
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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, GuestAddress, GuestMemory, GuestMemoryMmap, GuestMemoryRegion, GuestUsize,
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MmapError,
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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 ECX_HYPERVISOR_SHIFT: u32 = 31; // Hypervisor bit.
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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 configure the IRQ.
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Irq(io::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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}
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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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/// 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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}
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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(id: u8, vm: &Vm, io_bus: devices::Bus, mmio_bus: devices::Bus) -> 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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})
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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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self.fd
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.set_cpuid2(&vm.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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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 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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serial_evt: EventFd,
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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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// 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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) -> 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 serial_evt = EventFd::new(EFD_NONBLOCK).map_err(DeviceManagerError::EventFd)?;
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let serial = Arc::new(Mutex::new(devices::legacy::Serial::new_out(
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serial_evt
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.try_clone()
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.map_err(DeviceManagerError::EventFd)?,
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Box::new(stdout()),
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)));
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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)
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.map_err(DeviceManagerError::CreateVirtioBlock)?;
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Box::new(dev) as Box<vm_virtio::VirtioDevice>
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}
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ImageType::Qcow2 => {
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let qcow_img =
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QcowFile::from(raw_img).map_err(DeviceManagerError::QcowDeviceCreate)?;
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let dev = vm_virtio::Block::new(qcow_img, disk_cfg.path.to_path_buf(), false)
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.map_err(DeviceManagerError::CreateVirtioBlock)?;
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Box::new(dev) as Box<vm_virtio::VirtioDevice>
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}
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};
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DeviceManager::add_virtio_pci_device(
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block,
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memory.clone(),
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allocator,
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vm_fd,
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&mut pci_root,
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&mut mmio_bus,
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msi_capable,
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)?;
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}
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// Add virtio-net if required
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if let Some(net_cfg) = &vm_cfg.net {
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let mut virtio_net_device: vm_virtio::Net;
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if let Some(tap_if_name) = net_cfg.tap {
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let tap = Tap::open_named(tap_if_name).map_err(DeviceManagerError::OpenTap)?;
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virtio_net_device = vm_virtio::Net::new_with_tap(tap, Some(&net_cfg.mac))
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.map_err(DeviceManagerError::CreateVirtioNet)?;
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} else {
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virtio_net_device =
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vm_virtio::Net::new(net_cfg.ip, net_cfg.mask, Some(&net_cfg.mac))
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.map_err(DeviceManagerError::CreateVirtioNet)?;
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}
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DeviceManager::add_virtio_pci_device(
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Box::new(virtio_net_device),
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memory.clone(),
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allocator,
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vm_fd,
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&mut pci_root,
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&mut mmio_bus,
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msi_capable,
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)?;
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}
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// Add virtio-rng if required
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if let Some(rng_path) = vm_cfg.rng.src.to_str() {
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println!("VIRTIO_RNG PATH {}", rng_path);
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let virtio_rng_device =
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vm_virtio::Rng::new(rng_path).map_err(DeviceManagerError::CreateVirtioRng)?;
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DeviceManager::add_virtio_pci_device(
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Box::new(virtio_rng_device),
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memory.clone(),
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allocator,
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vm_fd,
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&mut pci_root,
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&mut mmio_bus,
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msi_capable,
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)?;
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}
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let pci = Arc::new(Mutex::new(PciConfigIo::new(pci_root)));
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Ok(DeviceManager {
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io_bus,
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mmio_bus,
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serial,
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serial_evt,
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i8042,
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exit_evt,
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pci,
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})
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}
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fn add_virtio_pci_device(
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virtio_device: Box<vm_virtio::VirtioDevice>,
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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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pci_root: &mut PciRoot,
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mmio_bus: &mut devices::Bus,
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msi_capable: bool,
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) -> DeviceManagerResult<()> {
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let msix_num = if msi_capable { DEFAULT_MSIX_VEC_NUM } else { 0 };
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let mut virtio_pci_device = VirtioPciDevice::new(memory, virtio_device, msix_num)
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.map_err(DeviceManagerError::VirtioDevice)?;
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let bars = virtio_pci_device
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.allocate_bars(allocator)
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.map_err(DeviceManagerError::AllocateBars)?;
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for (event, addr, _) in virtio_pci_device.ioeventfds() {
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let io_addr = IoEventAddress::Mmio(addr);
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vm_fd
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.register_ioevent(event.as_raw_fd(), &io_addr, NoDatamatch)
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.map_err(DeviceManagerError::RegisterIoevent)?;
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}
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if msi_capable {
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let vm_fd_clone = vm_fd.clone();
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let msi_cb = Arc::new(Box::new(move |p: InterruptParameters| {
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if let Some(entry) = p.msix {
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let msi_queue = kvm_msi {
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address_lo: entry.msg_addr_lo,
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address_hi: entry.msg_addr_hi,
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data: entry.msg_data,
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flags: 0u32,
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devid: 0u32,
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pad: [0u8; 12],
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};
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return vm_fd_clone.signal_msi(msi_queue).map(|ret| {
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if ret > 0 {
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debug!("MSI message successfully delivered");
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} else if ret == 0 {
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warn!("failed to deliver MSI message, blocked by guest");
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}
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});
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}
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Err(std::io::Error::new(
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std::io::ErrorKind::Other,
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"missing MSI-X entry",
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))
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}) as InterruptDelivery);
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virtio_pci_device.assign_msix(msi_cb);
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} else {
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let irqfd = EventFd::new(EFD_NONBLOCK).map_err(DeviceManagerError::EventFd)?;
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let irq_num = allocator
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.allocate_irq()
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.ok_or(DeviceManagerError::AllocateIrq)?;
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vm_fd
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.register_irqfd(irqfd.as_raw_fd(), irq_num)
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.map_err(DeviceManagerError::Irq)?;
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let irq_cb = Arc::new(
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Box::new(move |_p: InterruptParameters| irqfd.write(1)) as InterruptDelivery
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);
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virtio_pci_device.assign_pin_irq(irq_cb, irq_num as u32, PciInterruptPin::IntA);
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}
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|
|
let virtio_pci_device = Arc::new(Mutex::new(virtio_pci_device));
|
|
|
|
pci_root
|
|
.add_device(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)?;
|
|
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)?;
|
|
|
|
// Create IRQ chip
|
|
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)?;
|
|
|
|
// Supported CPUID
|
|
let mut cpuid = kvm
|
|
.get_supported_cpuid(MAX_KVM_CPUID_ENTRIES)
|
|
.map_err(Error::VmSetup)?;
|
|
Vm::patch_cpuid(&mut cpuid);
|
|
|
|
// 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,
|
|
kvm.check_extension(Cap::SignalMsi),
|
|
)
|
|
.map_err(Error::DeviceManager)?;
|
|
fd.register_irqfd(device_manager.serial_evt.as_raw_fd(), 4)
|
|
.map_err(Error::Irq)?;
|
|
|
|
// 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 = linux_loader::loader::Elf::load(
|
|
&self.memory,
|
|
None,
|
|
&mut self.kernel,
|
|
Some(arch::HIMEM_START),
|
|
)
|
|
.map_err(Error::KernelLoad)?;
|
|
|
|
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);
|
|
|
|
arch::configure_system(
|
|
&self.memory,
|
|
self.config.cmdline.offset,
|
|
cmdline_cstring.to_bytes().len() + 1,
|
|
vcpu_count,
|
|
)
|
|
.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 mut vcpu = Vcpu::new(cpu_id, &self, io_bus, mmio_bus)?;
|
|
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
|
|
}
|
|
|
|
fn patch_cpuid(cpuid: &mut CpuId) {
|
|
let entries = cpuid.mut_entries_slice();
|
|
|
|
for entry in entries.iter_mut() {
|
|
if let 1 = entry.function {
|
|
if entry.index == 0 {
|
|
entry.ecx |= 1 << ECX_HYPERVISOR_SHIFT;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#[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 => {}
|
|
VcpuExit::Hyperv => {}
|
|
}
|
|
// r => panic!("unexpected exit reason: {:?}", r),
|
|
}
|
|
}
|