2019-02-28 13:16:58 +00:00
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// Copyright © 2019 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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extern crate arch;
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2019-03-07 13:56:43 +00:00
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extern crate devices;
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2019-02-28 13:16:58 +00:00
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extern crate kvm_ioctls;
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2019-02-28 14:26:30 +00:00
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extern crate libc;
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2019-02-28 13:16:58 +00:00
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extern crate linux_loader;
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extern crate vm_memory;
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2019-02-28 14:26:30 +00:00
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extern crate vmm_sys_util;
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2019-02-28 13:16:58 +00:00
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2019-03-06 11:04:14 +00:00
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use kvm_bindings::{kvm_pit_config, kvm_userspace_memory_region, KVM_PIT_SPEAKER_DUMMY};
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2019-02-28 13:16:58 +00:00
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use kvm_ioctls::*;
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use libc::{c_void, siginfo_t, EFD_NONBLOCK};
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2019-02-28 13:16:58 +00:00
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use linux_loader::cmdline;
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use linux_loader::loader::KernelLoader;
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use std::ffi::CString;
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use std::fs::File;
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use std::io::{self, stdout};
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use std::path::Path;
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2019-03-07 13:56:43 +00:00
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use std::sync::{Arc, Barrier, Mutex};
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use std::{result, str, thread};
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2019-02-28 13:16:58 +00:00
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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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2019-02-28 14:26:30 +00:00
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use vmm_sys_util::signal::register_signal_handler;
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use vmm_sys_util::EventFd;
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2019-02-28 14:26:30 +00:00
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const VCPU_RTSIG_OFFSET: i32 = 0;
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pub const DEFAULT_VCPUS: u8 = 1;
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2019-03-06 11:04:14 +00:00
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const DEFAULT_CMDLINE: &str = "console=ttyS0 reboot=k panic=1 pci=off nomodules \
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i8042.noaux i8042.nomux i8042.nopnp i8042.dumbkbd";
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2019-02-28 13:16:58 +00:00
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const CMDLINE_OFFSET: GuestAddress = GuestAddress(0x20000);
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/// Errors associated with the wrappers over KVM ioctls.
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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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2019-02-28 14:26:30 +00:00
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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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2019-03-01 15:22:26 +00:00
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/// The call to KVM_SET_CPUID2 failed.
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SetSupportedCpusFailed(io::Error),
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2019-03-07 13:56:43 +00:00
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/// Cannot create EventFd.
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EventFd(io::Error),
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/// Cannot create a device manager.
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DeviceManager,
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/// Cannot add legacy device to Bus.
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BusError(devices::BusError),
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2019-02-28 13:16:58 +00:00
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}
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pub type Result<T> = result::Result<T, Error>;
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2019-02-28 14:26:30 +00:00
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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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}
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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) -> 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 { fd: kvm_vcpu, id })
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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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2019-03-01 15:22:26 +00:00
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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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2019-02-28 14:26:30 +00:00
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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<VcpuExit> {
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self.fd.run().map_err(Error::VcpuRun)
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}
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}
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2019-03-07 13:56:43 +00:00
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pub struct VmConfig<'a> {
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kernel_path: &'a Path,
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cmdline: Option<cmdline::Cmdline>,
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cmdline_addr: GuestAddress,
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memory_size: GuestUsize,
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vcpu_count: u8,
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}
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2019-03-07 13:56:43 +00:00
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impl<'a> VmConfig<'a> {
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pub fn new(kernel_path: &'a Path) -> Result<Self> {
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Ok(VmConfig {
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kernel_path,
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..Default::default()
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})
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}
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}
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2019-02-28 13:16:58 +00:00
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impl<'a> Default for VmConfig<'a> {
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fn default() -> Self {
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let line = String::from(DEFAULT_CMDLINE);
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2019-03-06 11:04:14 +00:00
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let mut cmdline = cmdline::Cmdline::new(arch::CMDLINE_MAX_SIZE);
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cmdline.insert_str(line).unwrap();
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VmConfig {
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kernel_path: Path::new(""),
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cmdline: Some(cmdline),
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cmdline_addr: CMDLINE_OFFSET,
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memory_size: 512,
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vcpu_count: 1,
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}
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}
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}
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2019-03-07 13:56:43 +00:00
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struct DeviceManager {
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io_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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}
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impl DeviceManager {
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fn new() -> Result<Self> {
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let io_bus = devices::Bus::new();
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let serial_evt = EventFd::new(EFD_NONBLOCK).map_err(Error::EventFd)?;
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let serial = Arc::new(Mutex::new(devices::legacy::Serial::new_out(
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serial_evt.try_clone().map_err(Error::EventFd)?,
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Box::new(stdout()),
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)));
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Ok(DeviceManager {
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io_bus,
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serial,
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serial_evt,
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})
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}
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/// Register legacy devices.
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pub fn register_devices(&mut self) -> Result<()> {
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self.io_bus
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.insert(self.serial.clone(), 0x3f8, 0x8)
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.map_err(Error::BusError)?;
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Ok(())
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}
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}
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2019-02-28 13:16:58 +00:00
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pub struct Vm<'a> {
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fd: VmFd,
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kernel: File,
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memory: GuestMemoryMmap,
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vcpus: Option<Vec<thread::JoinHandle<()>>>,
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devices: DeviceManager,
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cpuid: CpuId,
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config: VmConfig<'a>,
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}
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impl<'a> Vm<'a> {
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2019-03-07 13:56:43 +00:00
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pub fn new(kvm: &Kvm, config: VmConfig<'a>) -> Result<Self> {
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let kernel = File::open(&config.kernel_path).map_err(Error::KernelFile)?;
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let fd = kvm.create_vm().map_err(Error::VmCreate)?;
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// Init guest memory
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let arch_mem_regions = arch::arch_memory_regions(config.memory_size << 20);
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let guest_memory = GuestMemoryMmap::new(&arch_mem_regions).map_err(Error::GuestMemory)?;
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guest_memory
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.with_regions(|index, region| {
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let mem_region = kvm_userspace_memory_region {
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slot: index as u32,
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guest_phys_addr: region.start_addr().raw_value(),
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memory_size: region.len() as u64,
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userspace_addr: region.as_ptr() as u64,
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flags: 0,
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};
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println!(
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"Size {:?} guest addr 0x{:x} host addr 0x{:x}",
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mem_region.memory_size, mem_region.guest_phys_addr, mem_region.userspace_addr
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);
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// Safe because the guest regions are guaranteed not to overlap.
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fd.set_user_memory_region(mem_region)
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})
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.map_err(|_| Error::GuestMemory(MmapError::NoMemoryRegion))?;
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// Set TSS
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fd.set_tss_address(arch::x86_64::layout::KVM_TSS_ADDRESS.raw_value() as usize)
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.map_err(Error::VmSetup)?;
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2019-02-28 14:26:30 +00:00
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// Create IRQ chip
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fd.create_irq_chip().map_err(Error::VmSetup)?;
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2019-03-06 11:04:14 +00:00
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// Creates an in-kernel device model for the PIT.
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let mut pit_config = kvm_pit_config::default();
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// We need to enable the emulation of a dummy speaker port stub so that writing to port 0x61
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// (i.e. KVM_SPEAKER_BASE_ADDRESS) does not trigger an exit to user space.
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pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
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fd.create_pit2(pit_config).map_err(Error::VmSetup)?;
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2019-03-01 15:22:26 +00:00
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// Supported CPUID
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let cpuid = kvm
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.get_supported_cpuid(MAX_KVM_CPUID_ENTRIES)
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.map_err(Error::VmSetup)?;
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2019-03-07 13:56:43 +00:00
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let device_manager = DeviceManager::new().map_err(|_| Error::DeviceManager)?;
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2019-02-28 13:16:58 +00:00
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Ok(Vm {
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fd,
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kernel,
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memory: guest_memory,
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vcpus: None,
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devices: device_manager,
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cpuid,
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config,
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})
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}
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pub fn load_kernel(&mut self) -> Result<GuestAddress> {
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let cmdline = self.config.cmdline.clone().ok_or(Error::CmdLine)?;
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let cmdline_cstring = CString::new(cmdline).map_err(|_| Error::CmdLine)?;
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let entry_addr = linux_loader::loader::Elf::load(
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&self.memory,
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None,
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&mut self.kernel,
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Some(arch::HIMEM_START),
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)
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.map_err(Error::KernelLoad)?;
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linux_loader::loader::load_cmdline(
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&self.memory,
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self.config.cmdline_addr,
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&cmdline_cstring,
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)
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.map_err(|_| Error::CmdLine)?;
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let vcpu_count = self.config.vcpu_count;
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arch::configure_system(
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&self.memory,
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self.config.cmdline_addr,
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cmdline_cstring.to_bytes().len() + 1,
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vcpu_count,
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)
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.map_err(|_| Error::CmdLine)?;
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Ok(entry_addr.kernel_load)
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}
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2019-02-28 14:26:30 +00:00
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pub fn start(&mut self, entry_addr: GuestAddress) -> Result<()> {
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2019-03-07 13:56:43 +00:00
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self.devices.register_devices()?;
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2019-02-28 14:26:30 +00:00
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let vcpu_count = self.config.vcpu_count;
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2019-03-06 11:04:14 +00:00
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let mut vcpus: Vec<thread::JoinHandle<()>> = Vec::with_capacity(vcpu_count as usize);
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2019-02-28 14:26:30 +00:00
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let vcpu_thread_barrier = Arc::new(Barrier::new((vcpu_count + 1) as usize));
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for cpu_id in 0..vcpu_count {
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println!("Starting VCPU {:?}", cpu_id);
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2019-03-07 13:56:43 +00:00
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let io_bus = self.devices.io_bus.clone();
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2019-02-28 14:26:30 +00:00
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let mut vcpu = Vcpu::new(cpu_id, &self)?;
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vcpu.configure(entry_addr, &self)?;
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2019-03-06 11:04:14 +00:00
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let vcpu_thread_barrier = vcpu_thread_barrier.clone();
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2019-02-28 14:26:30 +00:00
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vcpus.push(
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thread::Builder::new()
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.name(format!("cloud-hypervisor_vcpu{}", vcpu.id))
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.spawn(move || {
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unsafe {
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extern "C" fn handle_signal(_: i32, _: *mut siginfo_t, _: *mut c_void) {
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}
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// This uses an async signal safe handler to kill the vcpu handles.
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register_signal_handler(
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VCPU_RTSIG_OFFSET,
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vmm_sys_util::signal::SignalHandler::Siginfo(handle_signal),
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true,
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0,
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)
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.expect("Failed to register vcpu signal handler");
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}
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2019-03-06 11:04:14 +00:00
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// Block until all CPUs are ready.
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2019-02-28 14:26:30 +00:00
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vcpu_thread_barrier.wait();
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loop {
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match vcpu.run() {
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Ok(run) => match run {
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2019-03-07 13:56:43 +00:00
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VcpuExit::IoIn(addr, data) => {
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io_bus.read(u64::from(addr), data);
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}
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2019-02-28 14:26:30 +00:00
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VcpuExit::IoOut(addr, data) => {
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2019-03-07 13:56:43 +00:00
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io_bus.write(u64::from(addr), data);
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2019-03-06 11:04:14 +00:00
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}
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VcpuExit::MmioRead(addr, _data) => {
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println!("MMIO R -- addr: {:#x}", addr);
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}
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VcpuExit::MmioWrite(addr, _data) => {
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println!("MMIO W -- addr: {:#x}", addr);
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}
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VcpuExit::Unknown => {
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println!("Unknown");
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}
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VcpuExit::Exception => {
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println!("Exception");
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2019-02-28 14:26:30 +00:00
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}
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VcpuExit::Hypercall => {}
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VcpuExit::Debug => {}
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VcpuExit::Hlt => {
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println!("HLT");
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}
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VcpuExit::IrqWindowOpen => {}
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VcpuExit::Shutdown => {}
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VcpuExit::FailEntry => {}
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VcpuExit::Intr => {}
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VcpuExit::SetTpr => {}
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VcpuExit::TprAccess => {}
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VcpuExit::S390Sieic => {}
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VcpuExit::S390Reset => {}
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VcpuExit::Dcr => {}
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VcpuExit::Nmi => {}
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VcpuExit::InternalError => {}
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VcpuExit::Osi => {}
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VcpuExit::PaprHcall => {}
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VcpuExit::S390Ucontrol => {}
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VcpuExit::Watchdog => {}
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VcpuExit::S390Tsch => {}
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VcpuExit::Epr => {}
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VcpuExit::SystemEvent => {}
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VcpuExit::S390Stsi => {}
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VcpuExit::IoapicEoi => {}
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VcpuExit::Hyperv => {}
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},
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Err(e) => {
|
2019-03-06 11:04:14 +00:00
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println! {"VCPU {:?} error {:?}", cpu_id, e};
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2019-02-28 14:26:30 +00:00
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break;
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}
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}
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}
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})
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.map_err(Error::VcpuSpawn)?,
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);
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}
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|
2019-03-06 11:04:14 +00:00
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// Unblock all CPU threads.
|
2019-02-28 14:26:30 +00:00
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vcpu_thread_barrier.wait();
|
2019-03-06 11:04:14 +00:00
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for vcpu_barrier in vcpus {
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vcpu_barrier.join().unwrap();
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}
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|
2019-02-28 13:16:58 +00:00
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Ok(())
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}
|
2019-02-28 14:26:30 +00:00
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/// Gets a reference to the guest memory owned by this VM.
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///
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/// Note that `GuestMemory` does not include any device memory that may have been added after
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/// this VM was constructed.
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pub fn get_memory(&self) -> &GuestMemoryMmap {
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&self.memory
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}
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/// Gets a reference to the kvm file descriptor owned by this VM.
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///
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pub fn get_fd(&self) -> &VmFd {
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&self.fd
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}
|
2019-02-28 13:16:58 +00:00
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}
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#[allow(unused)]
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|
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pub fn test_vm() {
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// This example based on https://lwn.net/Articles/658511/
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let code = [
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0xba, 0xf8, 0x03, /* mov $0x3f8, %dx */
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0x00, 0xd8, /* add %bl, %al */
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0x04, b'0', /* add $'0', %al */
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0xee, /* out %al, (%dx) */
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0xb0, b'\n', /* mov $'\n', %al */
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0xee, /* out %al, (%dx) */
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0xf4, /* hlt */
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];
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let mem_size = 0x1000;
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|
|
let load_addr = GuestAddress(0x1000);
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let mem = GuestMemoryMmap::new(&[(load_addr, mem_size)]).unwrap();
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let kvm = Kvm::new().expect("new KVM instance creation failed");
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|
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|
let vm_fd = kvm.create_vm().expect("new VM fd creation failed");
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mem.with_regions(|index, region| {
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|
let mem_region = kvm_userspace_memory_region {
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|
|
slot: index as u32,
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|
guest_phys_addr: region.start_addr().raw_value(),
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|
|
memory_size: region.len() as u64,
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|
|
userspace_addr: region.as_ptr() as u64,
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|
|
flags: 0,
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|
|
};
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|
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|
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|
|
|
// Safe because the guest regions are guaranteed not to overlap.
|
|
|
|
vm_fd.set_user_memory_region(mem_region)
|
|
|
|
})
|
|
|
|
.expect("Cannot configure guest memory");
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|
|
|
mem.write_slice(&code, load_addr)
|
|
|
|
.expect("Writing code to memory failed");
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|
|
|
|
|
|
|
let vcpu_fd = vm_fd.create_vcpu(0).expect("new VcpuFd failed");
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|
|
|
|
|
|
|
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");
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|
|
|
|
|
|
|
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),
|
|
|
|
}
|
|
|
|
}
|