mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-07-02 16:02:37 +00:00
b6801e355e
Refactor the vCPU thread starting so that there is the possibility to bring on extra vCPU threads. Signed-off-by: Rob Bradford <robert.bradford@intel.com>
633 lines
20 KiB
Rust
633 lines
20 KiB
Rust
// 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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use std::os::unix::thread::JoinHandleExt;
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::{Arc, Barrier, Mutex, RwLock, Weak};
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use std::thread;
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use std::{fmt, io, result};
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use libc::{c_void, siginfo_t};
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use crate::device_manager::DeviceManager;
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use devices::{ioapic, BusDevice};
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use kvm_bindings::CpuId;
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use kvm_ioctls::*;
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use vm_memory::{Address, GuestAddress, GuestMemoryMmap};
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use vmm_sys_util::eventfd::EventFd;
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use vmm_sys_util::signal::{register_signal_handler, validate_signal_num};
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const VCPU_RTSIG_OFFSET: i32 = 0;
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// Debug I/O port
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#[cfg(target_arch = "x86_64")]
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const DEBUG_IOPORT: u16 = 0x80;
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const DEBUG_IOPORT_PREFIX: &str = "Debug I/O port";
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/// Debug I/O port, see:
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/// https://www.intel.com/content/www/us/en/support/articles/000005500/boards-and-kits.html
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///
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/// Since we're not a physical platform, we can freely assign code ranges for
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/// debugging specific parts of our virtual platform.
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pub enum DebugIoPortRange {
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Firmware,
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Bootloader,
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Kernel,
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Userspace,
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Custom,
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}
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impl DebugIoPortRange {
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fn from_u8(value: u8) -> DebugIoPortRange {
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match value {
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0x00..=0x1f => DebugIoPortRange::Firmware,
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0x20..=0x3f => DebugIoPortRange::Bootloader,
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0x40..=0x5f => DebugIoPortRange::Kernel,
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0x60..=0x7f => DebugIoPortRange::Userspace,
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_ => DebugIoPortRange::Custom,
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}
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}
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}
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impl fmt::Display for DebugIoPortRange {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match self {
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DebugIoPortRange::Firmware => write!(f, "{}: Firmware", DEBUG_IOPORT_PREFIX),
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DebugIoPortRange::Bootloader => write!(f, "{}: Bootloader", DEBUG_IOPORT_PREFIX),
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DebugIoPortRange::Kernel => write!(f, "{}: Kernel", DEBUG_IOPORT_PREFIX),
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DebugIoPortRange::Userspace => write!(f, "{}: Userspace", DEBUG_IOPORT_PREFIX),
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DebugIoPortRange::Custom => write!(f, "{}: Custom", DEBUG_IOPORT_PREFIX),
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}
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}
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}
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#[derive(Debug)]
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pub enum Error {
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/// Cannot open the VCPU file descriptor.
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VcpuFd(kvm_ioctls::Error),
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/// Cannot run the VCPUs.
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VcpuRun(kvm_ioctls::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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/// 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(kvm_ioctls::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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/// Unexpected KVM_RUN exit reason
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VcpuUnhandledKvmExit,
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/// Failed to join on vCPU threads
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ThreadCleanup,
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/// Cannot add legacy device to Bus.
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BusError(devices::BusError),
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/// Failed to allocate IO port
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AllocateIOPort,
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/// Asking for more vCPUs that we can have
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DesiredVCPUCountExceedsMax,
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}
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pub type Result<T> = result::Result<T, Error>;
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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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pub struct CpuidPatch {
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pub function: u32,
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pub index: u32,
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pub flags_bit: Option<u8>,
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pub eax_bit: Option<u8>,
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pub ebx_bit: Option<u8>,
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pub ecx_bit: Option<u8>,
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pub 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.as_mut_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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pub fn patch_cpuid(cpuid: &mut CpuId, patches: Vec<CpuidPatch>) {
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let entries = cpuid.as_mut_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: Arc<devices::Bus>,
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mmio_bus: Arc<devices::Bus>,
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ioapic: Option<Arc<Mutex<ioapic::Ioapic>>>,
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vm_ts: std::time::Instant,
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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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fd: &Arc<VmFd>,
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io_bus: Arc<devices::Bus>,
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mmio_bus: Arc<devices::Bus>,
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ioapic: Option<Arc<Mutex<ioapic::Ioapic>>>,
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creation_ts: std::time::Instant,
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) -> Result<Self> {
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let kvm_vcpu = 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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vm_ts: creation_ts,
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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(
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&mut self,
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kernel_start_addr: GuestAddress,
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vm_memory: &Arc<RwLock<GuestMemoryMmap>>,
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cpuid: CpuId,
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) -> Result<()> {
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let mut cpuid = cpuid;
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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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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.read().unwrap(), &self.fd)
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.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<bool> {
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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(true)
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}
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VcpuExit::IoOut(addr, data) => {
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if addr == DEBUG_IOPORT && data.len() == 1 {
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self.log_debug_ioport(data[0]);
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}
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self.io_bus.write(u64::from(addr), data);
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Ok(true)
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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(true)
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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(true)
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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(true)
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}
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VcpuExit::Shutdown => {
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// Triple fault to trigger a reboot
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Ok(false)
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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.errno() {
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libc::EAGAIN | libc::EINTR => Ok(true),
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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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// Log debug io port codes.
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fn log_debug_ioport(&self, code: u8) {
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let ts = self.vm_ts.elapsed();
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debug!(
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"[{} code 0x{:x}] {}.{:>06} seconds",
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DebugIoPortRange::from_u8(code),
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code,
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ts.as_secs(),
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ts.as_micros()
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);
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}
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}
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pub struct CpuManager {
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boot_vcpus: u8,
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max_vcpus: u8,
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io_bus: Weak<devices::Bus>,
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mmio_bus: Arc<devices::Bus>,
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ioapic: Option<Arc<Mutex<ioapic::Ioapic>>>,
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vm_memory: Arc<RwLock<GuestMemoryMmap>>,
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cpuid: CpuId,
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fd: Arc<VmFd>,
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vcpus_kill_signalled: Arc<AtomicBool>,
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vcpus_pause_signalled: Arc<AtomicBool>,
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reset_evt: EventFd,
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vcpu_states: Vec<VcpuState>,
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selected_cpu: u8,
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}
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const CPU_ENABLE_FLAG: usize = 0;
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const CPU_STATUS_OFFSET: u64 = 4;
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const CPU_SELECTION_OFFSET: u64 = 0;
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impl BusDevice for CpuManager {
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fn read(&mut self, _base: u64, offset: u64, data: &mut [u8]) {
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match offset {
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CPU_STATUS_OFFSET => {
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if self.selected_cpu < self.present_vcpus() {
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let state = &self.vcpu_states[usize::from(self.selected_cpu)];
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if state.active() {
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data[0] |= 1 << CPU_ENABLE_FLAG;
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}
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}
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}
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_ => {
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warn!(
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"Unexpected offset for accessing CPU manager device: {:#}",
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offset
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);
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}
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}
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}
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fn write(&mut self, _base: u64, offset: u64, data: &[u8]) {
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match offset {
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CPU_SELECTION_OFFSET => {
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self.selected_cpu = data[0];
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}
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_ => {
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warn!(
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"Unexpected offset for accessing CPU manager device: {:#}",
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offset
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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 VcpuState {
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handle: Option<thread::JoinHandle<()>>,
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}
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impl VcpuState {
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fn active(&self) -> bool {
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self.handle.is_some()
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}
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fn signal_thread(&self) {
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if let Some(handle) = self.handle.as_ref() {
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let signum = validate_signal_num(VCPU_RTSIG_OFFSET, true).unwrap();
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unsafe {
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libc::pthread_kill(handle.as_pthread_t(), signum);
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}
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}
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}
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fn join_thread(&mut self) -> Result<()> {
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if let Some(handle) = self.handle.take() {
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handle.join().map_err(|_| Error::ThreadCleanup)?
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}
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Ok(())
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}
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fn unpark_thread(&self) {
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if let Some(handle) = self.handle.as_ref() {
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handle.thread().unpark()
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}
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}
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}
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impl CpuManager {
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pub fn new(
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boot_vcpus: u8,
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max_vcpus: u8,
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device_manager: &DeviceManager,
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guest_memory: Arc<RwLock<GuestMemoryMmap>>,
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fd: Arc<VmFd>,
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cpuid: CpuId,
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reset_evt: EventFd,
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) -> Result<Arc<Mutex<CpuManager>>> {
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let cpu_manager = Arc::new(Mutex::new(CpuManager {
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boot_vcpus,
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max_vcpus,
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io_bus: Arc::downgrade(&device_manager.io_bus().clone()),
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mmio_bus: device_manager.mmio_bus().clone(),
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ioapic: device_manager.ioapic().clone(),
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vm_memory: guest_memory,
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cpuid,
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fd,
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vcpus_kill_signalled: Arc::new(AtomicBool::new(false)),
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vcpus_pause_signalled: Arc::new(AtomicBool::new(false)),
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vcpu_states: Vec::with_capacity(max_vcpus as usize),
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reset_evt,
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selected_cpu: 0,
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}));
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device_manager
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.allocator()
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.lock()
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.unwrap()
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.allocate_io_addresses(Some(GuestAddress(0x0cd8)), 0x8, None)
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.ok_or(Error::AllocateIOPort)?;
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cpu_manager
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.lock()
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.unwrap()
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.io_bus
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.upgrade()
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.unwrap()
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.insert(cpu_manager.clone(), 0x0cd8, 0xc)
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.map_err(Error::BusError)?;
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Ok(cpu_manager)
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}
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fn activate_vcpus(&mut self, desired_vcpus: u8, entry_addr: GuestAddress) -> Result<()> {
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if desired_vcpus > self.max_vcpus {
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return Err(Error::DesiredVCPUCountExceedsMax);
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}
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let creation_ts = std::time::Instant::now();
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let vcpu_thread_barrier = Arc::new(Barrier::new(
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(desired_vcpus - self.present_vcpus() + 1) as usize,
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));
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for cpu_id in self.present_vcpus()..desired_vcpus {
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let ioapic = if let Some(ioapic) = &self.ioapic {
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Some(ioapic.clone())
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} else {
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None
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};
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let mut vcpu = Vcpu::new(
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cpu_id,
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&self.fd,
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self.io_bus.clone().upgrade().unwrap(),
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self.mmio_bus.clone(),
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ioapic,
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creation_ts,
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)?;
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vcpu.configure(entry_addr, &self.vm_memory, self.cpuid.clone())?;
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let vcpu_thread_barrier = vcpu_thread_barrier.clone();
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let reset_evt = self.reset_evt.try_clone().unwrap();
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let vcpu_kill_signalled = self.vcpus_kill_signalled.clone();
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let vcpu_pause_signalled = self.vcpus_pause_signalled.clone();
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let handle = Some(
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thread::Builder::new()
|
|
.name(format!("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();
|
|
|
|
loop {
|
|
// vcpu.run() returns false on a KVM_EXIT_SHUTDOWN (triple-fault) so trigger a reset
|
|
match vcpu.run() {
|
|
Err(e) => {
|
|
error!("VCPU generated error: {:?}", e);
|
|
break;
|
|
}
|
|
Ok(true) => {}
|
|
Ok(false) => {
|
|
reset_evt.write(1).unwrap();
|
|
break;
|
|
}
|
|
}
|
|
|
|
// We've been told to terminate
|
|
if vcpu_kill_signalled.load(Ordering::SeqCst) {
|
|
break;
|
|
}
|
|
|
|
// If we are being told to pause, we park the thread
|
|
// until the pause boolean is toggled.
|
|
// The resume operation is responsible for toggling
|
|
// the boolean and unpark the thread.
|
|
// We enter a loop because park() could spuriously
|
|
// return. We will then park() again unless the
|
|
// pause boolean has been toggled.
|
|
while vcpu_pause_signalled.load(Ordering::SeqCst) {
|
|
thread::park();
|
|
}
|
|
}
|
|
})
|
|
.map_err(Error::VcpuSpawn)?,
|
|
);
|
|
|
|
self.vcpu_states.push(VcpuState { handle });
|
|
}
|
|
|
|
// Unblock all CPU threads.
|
|
vcpu_thread_barrier.wait();
|
|
Ok(())
|
|
}
|
|
|
|
// Starts all the vCPUs that the VM is booting with. Blocks until all vCPUs are running.
|
|
pub fn start_boot_vcpus(&mut self, entry_addr: GuestAddress) -> Result<()> {
|
|
self.activate_vcpus(self.boot_vcpus(), entry_addr)
|
|
}
|
|
|
|
pub fn shutdown(&mut self) -> Result<()> {
|
|
// Tell the vCPUs to stop themselves next time they go through the loop
|
|
self.vcpus_kill_signalled.store(true, Ordering::SeqCst);
|
|
|
|
// Signal to the spawned threads (vCPUs and console signal handler). For the vCPU threads
|
|
// this will interrupt the KVM_RUN ioctl() allowing the loop to check the boolean set
|
|
// above.
|
|
for state in self.vcpu_states.iter() {
|
|
state.signal_thread();
|
|
}
|
|
|
|
// Wait for all the threads to finish. This removes the state from the vector.
|
|
for mut state in self.vcpu_states.drain(..) {
|
|
state.join_thread()?;
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub fn pause(&self) -> Result<()> {
|
|
// Tell the vCPUs to pause themselves next time they exit
|
|
self.vcpus_pause_signalled.store(true, Ordering::SeqCst);
|
|
|
|
// Signal to the spawned threads (vCPUs and console signal handler). For the vCPU threads
|
|
// this will interrupt the KVM_RUN ioctl() allowing the loop to check the boolean set
|
|
// above.
|
|
for state in self.vcpu_states.iter() {
|
|
state.signal_thread();
|
|
}
|
|
|
|
Ok(())
|
|
}
|
|
|
|
pub fn resume(&self) -> Result<()> {
|
|
// Toggle the vCPUs pause boolean
|
|
self.vcpus_pause_signalled.store(false, Ordering::SeqCst);
|
|
|
|
// Unpark all the VCPU threads.
|
|
// Once unparked, the next thing they will do is checking for the pause
|
|
// boolean. Since it'll be set to false, they will exit their pause loop
|
|
// and go back to vmx root.
|
|
for state in self.vcpu_states.iter() {
|
|
state.unpark_thread();
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn boot_vcpus(&self) -> u8 {
|
|
self.boot_vcpus
|
|
}
|
|
|
|
pub fn max_vcpus(&self) -> u8 {
|
|
self.max_vcpus
|
|
}
|
|
|
|
fn present_vcpus(&self) -> u8 {
|
|
self.vcpu_states.len() as u8
|
|
}
|
|
}
|