mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-12-22 21:55:20 +00:00
10ab87d6a3
Replace with serde instead. Fixes: #6370 Signed-off-by: Rob Bradford <rbradford@rivosinc.com>
675 lines
22 KiB
Rust
675 lines
22 KiB
Rust
// Copyright (c) 2020 Ant Financial
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//
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// SPDX-License-Identifier: Apache-2.0
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use crate::{
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seccomp_filters::Thread, thread_helper::spawn_virtio_thread, ActivateResult, EpollHelper,
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EpollHelperError, EpollHelperHandler, GuestMemoryMmap, VirtioCommon, VirtioDevice,
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VirtioDeviceType, VirtioInterrupt, VirtioInterruptType, EPOLL_HELPER_EVENT_LAST,
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VIRTIO_F_VERSION_1,
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};
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use anyhow::anyhow;
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use seccompiler::SeccompAction;
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use serde::{Deserialize, Serialize};
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use std::io::{self, Write};
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use std::mem::size_of;
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use std::os::unix::io::AsRawFd;
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use std::result;
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use std::sync::{atomic::AtomicBool, Arc, Barrier};
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use thiserror::Error;
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use virtio_queue::{Queue, QueueT};
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use vm_allocator::page_size::{align_page_size_down, get_page_size};
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use vm_memory::{
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Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemory, GuestMemoryAtomic,
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GuestMemoryError, GuestMemoryRegion,
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};
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use vm_migration::{Migratable, MigratableError, Pausable, Snapshot, Snapshottable, Transportable};
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use vmm_sys_util::eventfd::EventFd;
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const QUEUE_SIZE: u16 = 128;
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const REPORTING_QUEUE_SIZE: u16 = 32;
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const MIN_NUM_QUEUES: usize = 2;
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// Inflate virtio queue event.
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const INFLATE_QUEUE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 1;
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// Deflate virtio queue event.
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const DEFLATE_QUEUE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 2;
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// Reporting virtio queue event.
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const REPORTING_QUEUE_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 3;
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// Size of a PFN in the balloon interface.
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const VIRTIO_BALLOON_PFN_SHIFT: u64 = 12;
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// Deflate balloon on OOM
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const VIRTIO_BALLOON_F_DEFLATE_ON_OOM: u64 = 2;
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// Enable an additional virtqueue to let the guest notify the host about free
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// pages.
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const VIRTIO_BALLOON_F_REPORTING: u64 = 5;
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#[derive(Error, Debug)]
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pub enum Error {
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#[error("Guest gave us bad memory addresses.: {0}")]
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GuestMemory(GuestMemoryError),
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#[error("Guest gave us a write only descriptor that protocol says to read from")]
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UnexpectedWriteOnlyDescriptor,
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#[error("Guest sent us invalid request")]
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InvalidRequest,
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#[error("Fallocate fail.: {0}")]
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FallocateFail(std::io::Error),
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#[error("Madvise fail.: {0}")]
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MadviseFail(std::io::Error),
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#[error("Failed to EventFd write.: {0}")]
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EventFdWriteFail(std::io::Error),
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#[error("Invalid queue index: {0}")]
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InvalidQueueIndex(usize),
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#[error("Fail tp signal: {0}")]
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FailedSignal(io::Error),
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#[error("Descriptor chain is too short")]
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DescriptorChainTooShort,
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#[error("Failed adding used index: {0}")]
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QueueAddUsed(virtio_queue::Error),
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#[error("Failed creating an iterator over the queue: {0}")]
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QueueIterator(virtio_queue::Error),
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}
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// Got from include/uapi/linux/virtio_balloon.h
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#[repr(C)]
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#[derive(Copy, Clone, Debug, Default, Serialize, Deserialize)]
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pub struct VirtioBalloonConfig {
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// Number of pages host wants Guest to give up.
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num_pages: u32,
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// Number of pages we've actually got in balloon.
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actual: u32,
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}
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#[derive(Clone, Debug)]
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struct PartiallyBalloonedPage {
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addr: u64,
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bitmap: Vec<u64>,
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page_size: u64,
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}
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impl PartiallyBalloonedPage {
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fn new() -> Self {
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let page_size = get_page_size();
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let len = ((page_size >> VIRTIO_BALLOON_PFN_SHIFT) + 63) / 64;
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// Initial each padding bit as 1 in bitmap.
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let mut bitmap = vec![0_u64; len as usize];
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let pad_num = len * 64 - (page_size >> VIRTIO_BALLOON_PFN_SHIFT);
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bitmap[(len - 1) as usize] = !((1 << (64 - pad_num)) - 1);
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Self {
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addr: 0,
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bitmap,
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page_size,
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}
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}
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fn pfn_match(&self, addr: u64) -> bool {
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self.addr == addr & !(self.page_size - 1)
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}
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fn bitmap_full(&self) -> bool {
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self.bitmap.iter().all(|b| *b == u64::MAX)
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}
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fn set_bit(&mut self, addr: u64) {
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let addr_offset = (addr % self.page_size) >> VIRTIO_BALLOON_PFN_SHIFT;
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self.bitmap[(addr_offset / 64) as usize] |= 1 << (addr_offset % 64);
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}
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fn reset(&mut self) {
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let len = ((self.page_size >> VIRTIO_BALLOON_PFN_SHIFT) + 63) / 64;
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self.addr = 0;
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self.bitmap = vec![0; len as usize];
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let pad_num = len * 64 - (self.page_size >> VIRTIO_BALLOON_PFN_SHIFT);
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self.bitmap[(len - 1) as usize] = !((1 << (64 - pad_num)) - 1);
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}
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}
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const CONFIG_ACTUAL_OFFSET: u64 = 4;
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const CONFIG_ACTUAL_SIZE: usize = 4;
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// SAFETY: it only has data and has no implicit padding.
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unsafe impl ByteValued for VirtioBalloonConfig {}
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struct BalloonEpollHandler {
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mem: GuestMemoryAtomic<GuestMemoryMmap>,
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queues: Vec<Queue>,
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interrupt_cb: Arc<dyn VirtioInterrupt>,
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inflate_queue_evt: EventFd,
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deflate_queue_evt: EventFd,
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reporting_queue_evt: Option<EventFd>,
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kill_evt: EventFd,
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pause_evt: EventFd,
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pbp: Option<PartiallyBalloonedPage>,
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}
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impl BalloonEpollHandler {
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fn signal(&self, int_type: VirtioInterruptType) -> result::Result<(), Error> {
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self.interrupt_cb.trigger(int_type).map_err(|e| {
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error!("Failed to signal used queue: {:?}", e);
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Error::FailedSignal(e)
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})
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}
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fn advise_memory_range(
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memory: &GuestMemoryMmap,
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range_base: GuestAddress,
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range_len: usize,
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advice: libc::c_int,
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) -> result::Result<(), Error> {
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let hva = memory
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.get_host_address(range_base)
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.map_err(Error::GuestMemory)?;
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let res =
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// SAFETY: Need unsafe to do syscall madvise
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unsafe { libc::madvise(hva as *mut libc::c_void, range_len as libc::size_t, advice) };
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if res != 0 {
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return Err(Error::MadviseFail(io::Error::last_os_error()));
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}
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Ok(())
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}
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fn release_memory_range(
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memory: &GuestMemoryMmap,
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range_base: GuestAddress,
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range_len: usize,
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) -> result::Result<(), Error> {
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let region = memory.find_region(range_base).ok_or(Error::GuestMemory(
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GuestMemoryError::InvalidGuestAddress(range_base),
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))?;
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if let Some(f_off) = region.file_offset() {
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let offset = range_base.0 - region.start_addr().0;
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// SAFETY: FFI call with valid arguments
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let res = unsafe {
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libc::fallocate64(
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f_off.file().as_raw_fd(),
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libc::FALLOC_FL_PUNCH_HOLE | libc::FALLOC_FL_KEEP_SIZE,
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(offset + f_off.start()) as libc::off64_t,
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range_len as libc::off64_t,
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)
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};
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if res != 0 {
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return Err(Error::FallocateFail(io::Error::last_os_error()));
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}
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}
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Self::advise_memory_range(memory, range_base, range_len, libc::MADV_DONTNEED)
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}
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fn release_memory_range_4k(
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pbp: &mut Option<PartiallyBalloonedPage>,
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memory: &GuestMemoryMmap,
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pfn: u32,
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) -> result::Result<(), Error> {
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let range_base = GuestAddress((pfn as u64) << VIRTIO_BALLOON_PFN_SHIFT);
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let range_len = 1 << VIRTIO_BALLOON_PFN_SHIFT;
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let page_size: u64 = get_page_size();
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if page_size == 1 << VIRTIO_BALLOON_PFN_SHIFT {
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return Self::release_memory_range(memory, range_base, range_len);
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}
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if pbp.is_none() {
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*pbp = Some(PartiallyBalloonedPage::new());
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}
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if !pbp.as_ref().unwrap().pfn_match(range_base.0) {
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// We are trying to free memory region in a different pfn with current pbp. Flush pbp.
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pbp.as_mut().unwrap().reset();
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pbp.as_mut().unwrap().addr = align_page_size_down(range_base.0);
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}
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pbp.as_mut().unwrap().set_bit(range_base.0);
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if pbp.as_ref().unwrap().bitmap_full() {
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Self::release_memory_range(
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memory,
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vm_memory::GuestAddress(pbp.as_ref().unwrap().addr),
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page_size as usize,
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)?;
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pbp.as_mut().unwrap().reset();
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}
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Ok(())
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}
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fn process_queue(&mut self, queue_index: usize) -> result::Result<(), Error> {
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let mut used_descs = false;
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while let Some(mut desc_chain) =
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self.queues[queue_index].pop_descriptor_chain(self.mem.memory())
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{
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let desc = desc_chain.next().ok_or(Error::DescriptorChainTooShort)?;
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let data_chunk_size = size_of::<u32>();
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// The head contains the request type which MUST be readable.
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if desc.is_write_only() {
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error!("The head contains the request type is not right");
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return Err(Error::UnexpectedWriteOnlyDescriptor);
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}
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if desc.len() as usize % data_chunk_size != 0 {
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error!("the request size {} is not right", desc.len());
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return Err(Error::InvalidRequest);
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}
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let mut offset = 0u64;
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while offset < desc.len() as u64 {
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let addr = desc.addr().checked_add(offset).unwrap();
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let pfn: u32 = desc_chain
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.memory()
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.read_obj(addr)
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.map_err(Error::GuestMemory)?;
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offset += data_chunk_size as u64;
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match queue_index {
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0 => {
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Self::release_memory_range_4k(&mut self.pbp, desc_chain.memory(), pfn)?;
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}
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1 => {
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let page_size = get_page_size() as usize;
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let rbase = align_page_size_down((pfn as u64) << VIRTIO_BALLOON_PFN_SHIFT);
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Self::advise_memory_range(
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desc_chain.memory(),
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vm_memory::GuestAddress(rbase),
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page_size,
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libc::MADV_WILLNEED,
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)?;
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}
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_ => return Err(Error::InvalidQueueIndex(queue_index)),
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}
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}
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self.queues[queue_index]
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.add_used(desc_chain.memory(), desc_chain.head_index(), desc.len())
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.map_err(Error::QueueAddUsed)?;
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used_descs = true;
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}
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if used_descs {
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self.signal(VirtioInterruptType::Queue(queue_index as u16))
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} else {
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Ok(())
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}
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}
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fn process_reporting_queue(&mut self, queue_index: usize) -> result::Result<(), Error> {
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let mut used_descs = false;
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while let Some(mut desc_chain) =
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self.queues[queue_index].pop_descriptor_chain(self.mem.memory())
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{
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let mut descs_len = 0;
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while let Some(desc) = desc_chain.next() {
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descs_len += desc.len();
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Self::release_memory_range(desc_chain.memory(), desc.addr(), desc.len() as usize)?;
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}
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self.queues[queue_index]
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.add_used(desc_chain.memory(), desc_chain.head_index(), descs_len)
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.map_err(Error::QueueAddUsed)?;
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used_descs = true;
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}
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if used_descs {
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self.signal(VirtioInterruptType::Queue(queue_index as u16))
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} else {
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Ok(())
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}
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}
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fn run(
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&mut self,
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paused: Arc<AtomicBool>,
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paused_sync: Arc<Barrier>,
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) -> result::Result<(), EpollHelperError> {
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let mut helper = EpollHelper::new(&self.kill_evt, &self.pause_evt)?;
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helper.add_event(self.inflate_queue_evt.as_raw_fd(), INFLATE_QUEUE_EVENT)?;
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helper.add_event(self.deflate_queue_evt.as_raw_fd(), DEFLATE_QUEUE_EVENT)?;
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if let Some(reporting_queue_evt) = self.reporting_queue_evt.as_ref() {
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helper.add_event(reporting_queue_evt.as_raw_fd(), REPORTING_QUEUE_EVENT)?;
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}
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helper.run(paused, paused_sync, self)?;
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Ok(())
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}
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}
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impl EpollHelperHandler for BalloonEpollHandler {
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fn handle_event(
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&mut self,
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_helper: &mut EpollHelper,
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event: &epoll::Event,
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) -> result::Result<(), EpollHelperError> {
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let ev_type = event.data as u16;
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match ev_type {
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INFLATE_QUEUE_EVENT => {
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self.inflate_queue_evt.read().map_err(|e| {
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EpollHelperError::HandleEvent(anyhow!(
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"Failed to get inflate queue event: {:?}",
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e
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))
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})?;
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self.process_queue(0).map_err(|e| {
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EpollHelperError::HandleEvent(anyhow!(
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"Failed to signal used inflate queue: {:?}",
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e
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))
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})?;
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}
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DEFLATE_QUEUE_EVENT => {
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self.deflate_queue_evt.read().map_err(|e| {
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EpollHelperError::HandleEvent(anyhow!(
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"Failed to get deflate queue event: {:?}",
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e
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))
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})?;
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self.process_queue(1).map_err(|e| {
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EpollHelperError::HandleEvent(anyhow!(
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"Failed to signal used deflate queue: {:?}",
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e
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))
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})?;
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}
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REPORTING_QUEUE_EVENT => {
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if let Some(reporting_queue_evt) = self.reporting_queue_evt.as_ref() {
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reporting_queue_evt.read().map_err(|e| {
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EpollHelperError::HandleEvent(anyhow!(
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"Failed to get reporting queue event: {:?}",
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e
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))
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})?;
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self.process_reporting_queue(2).map_err(|e| {
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EpollHelperError::HandleEvent(anyhow!(
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"Failed to signal used inflate queue: {:?}",
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e
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))
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})?;
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} else {
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return Err(EpollHelperError::HandleEvent(anyhow!(
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"Invalid reporting queue event as no eventfd registered"
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)));
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}
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}
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_ => {
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return Err(EpollHelperError::HandleEvent(anyhow!(
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"Unknown event for virtio-balloon"
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)));
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}
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}
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Ok(())
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}
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}
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#[derive(Serialize, Deserialize)]
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pub struct BalloonState {
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pub avail_features: u64,
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pub acked_features: u64,
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pub config: VirtioBalloonConfig,
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}
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// Virtio device for exposing entropy to the guest OS through virtio.
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pub struct Balloon {
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common: VirtioCommon,
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id: String,
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config: VirtioBalloonConfig,
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seccomp_action: SeccompAction,
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exit_evt: EventFd,
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interrupt_cb: Option<Arc<dyn VirtioInterrupt>>,
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}
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impl Balloon {
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// Create a new virtio-balloon.
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pub fn new(
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id: String,
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size: u64,
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deflate_on_oom: bool,
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free_page_reporting: bool,
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seccomp_action: SeccompAction,
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exit_evt: EventFd,
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state: Option<BalloonState>,
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) -> io::Result<Self> {
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let mut queue_sizes = vec![QUEUE_SIZE; MIN_NUM_QUEUES];
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let (avail_features, acked_features, config, paused) = if let Some(state) = state {
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info!("Restoring virtio-balloon {}", id);
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(
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state.avail_features,
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state.acked_features,
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state.config,
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true,
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)
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} else {
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let mut avail_features = 1u64 << VIRTIO_F_VERSION_1;
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if deflate_on_oom {
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avail_features |= 1u64 << VIRTIO_BALLOON_F_DEFLATE_ON_OOM;
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}
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if free_page_reporting {
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avail_features |= 1u64 << VIRTIO_BALLOON_F_REPORTING;
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}
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let config = VirtioBalloonConfig {
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num_pages: (size >> VIRTIO_BALLOON_PFN_SHIFT) as u32,
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..Default::default()
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};
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(avail_features, 0, config, false)
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};
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if free_page_reporting {
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queue_sizes.push(REPORTING_QUEUE_SIZE);
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}
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Ok(Balloon {
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common: VirtioCommon {
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device_type: VirtioDeviceType::Balloon as u32,
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avail_features,
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acked_features,
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paused_sync: Some(Arc::new(Barrier::new(2))),
|
|
queue_sizes,
|
|
min_queues: MIN_NUM_QUEUES as u16,
|
|
paused: Arc::new(AtomicBool::new(paused)),
|
|
..Default::default()
|
|
},
|
|
id,
|
|
config,
|
|
seccomp_action,
|
|
exit_evt,
|
|
interrupt_cb: None,
|
|
})
|
|
}
|
|
|
|
pub fn resize(&mut self, size: u64) -> Result<(), Error> {
|
|
self.config.num_pages = (size >> VIRTIO_BALLOON_PFN_SHIFT) as u32;
|
|
|
|
if let Some(interrupt_cb) = &self.interrupt_cb {
|
|
interrupt_cb
|
|
.trigger(VirtioInterruptType::Config)
|
|
.map_err(Error::FailedSignal)
|
|
} else {
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
// Get the actual size of the virtio-balloon.
|
|
pub fn get_actual(&self) -> u64 {
|
|
(self.config.actual as u64) << VIRTIO_BALLOON_PFN_SHIFT
|
|
}
|
|
|
|
fn state(&self) -> BalloonState {
|
|
BalloonState {
|
|
avail_features: self.common.avail_features,
|
|
acked_features: self.common.acked_features,
|
|
config: self.config,
|
|
}
|
|
}
|
|
|
|
#[cfg(fuzzing)]
|
|
pub fn wait_for_epoll_threads(&mut self) {
|
|
self.common.wait_for_epoll_threads();
|
|
}
|
|
}
|
|
|
|
impl Drop for Balloon {
|
|
fn drop(&mut self) {
|
|
if let Some(kill_evt) = self.common.kill_evt.take() {
|
|
// Ignore the result because there is nothing we can do about it.
|
|
let _ = kill_evt.write(1);
|
|
}
|
|
self.common.wait_for_epoll_threads();
|
|
}
|
|
}
|
|
|
|
impl VirtioDevice for Balloon {
|
|
fn device_type(&self) -> u32 {
|
|
self.common.device_type
|
|
}
|
|
|
|
fn queue_max_sizes(&self) -> &[u16] {
|
|
&self.common.queue_sizes
|
|
}
|
|
|
|
fn features(&self) -> u64 {
|
|
self.common.avail_features
|
|
}
|
|
|
|
fn ack_features(&mut self, value: u64) {
|
|
self.common.ack_features(value)
|
|
}
|
|
|
|
fn read_config(&self, offset: u64, data: &mut [u8]) {
|
|
self.read_config_from_slice(self.config.as_slice(), offset, data);
|
|
}
|
|
|
|
fn write_config(&mut self, offset: u64, data: &[u8]) {
|
|
// The "actual" field is the only mutable field
|
|
if offset != CONFIG_ACTUAL_OFFSET || data.len() != CONFIG_ACTUAL_SIZE {
|
|
error!(
|
|
"Attempt to write to read-only field: offset {:x} length {}",
|
|
offset,
|
|
data.len()
|
|
);
|
|
return;
|
|
}
|
|
|
|
let config = self.config.as_mut_slice();
|
|
let config_len = config.len() as u64;
|
|
let data_len = data.len() as u64;
|
|
if offset + data_len > config_len {
|
|
error!(
|
|
"Out-of-bound access to configuration: config_len = {} offset = {:x} length = {} for {}",
|
|
config_len,
|
|
offset,
|
|
data_len,
|
|
self.device_type()
|
|
);
|
|
return;
|
|
}
|
|
|
|
if let Some(end) = offset.checked_add(config.len() as u64) {
|
|
let mut offset_config =
|
|
&mut config[offset as usize..std::cmp::min(end, config_len) as usize];
|
|
offset_config.write_all(data).unwrap();
|
|
}
|
|
}
|
|
|
|
fn activate(
|
|
&mut self,
|
|
mem: GuestMemoryAtomic<GuestMemoryMmap>,
|
|
interrupt_cb: Arc<dyn VirtioInterrupt>,
|
|
mut queues: Vec<(usize, Queue, EventFd)>,
|
|
) -> ActivateResult {
|
|
self.common.activate(&queues, &interrupt_cb)?;
|
|
let (kill_evt, pause_evt) = self.common.dup_eventfds();
|
|
|
|
let mut virtqueues = Vec::new();
|
|
let (_, queue, queue_evt) = queues.remove(0);
|
|
virtqueues.push(queue);
|
|
let inflate_queue_evt = queue_evt;
|
|
let (_, queue, queue_evt) = queues.remove(0);
|
|
virtqueues.push(queue);
|
|
let deflate_queue_evt = queue_evt;
|
|
let reporting_queue_evt =
|
|
if self.common.feature_acked(VIRTIO_BALLOON_F_REPORTING) && !queues.is_empty() {
|
|
let (_, queue, queue_evt) = queues.remove(0);
|
|
virtqueues.push(queue);
|
|
Some(queue_evt)
|
|
} else {
|
|
None
|
|
};
|
|
|
|
self.interrupt_cb = Some(interrupt_cb.clone());
|
|
|
|
let mut handler = BalloonEpollHandler {
|
|
mem,
|
|
queues: virtqueues,
|
|
interrupt_cb,
|
|
inflate_queue_evt,
|
|
deflate_queue_evt,
|
|
reporting_queue_evt,
|
|
kill_evt,
|
|
pause_evt,
|
|
pbp: None,
|
|
};
|
|
|
|
let paused = self.common.paused.clone();
|
|
let paused_sync = self.common.paused_sync.clone();
|
|
let mut epoll_threads = Vec::new();
|
|
|
|
spawn_virtio_thread(
|
|
&self.id,
|
|
&self.seccomp_action,
|
|
Thread::VirtioBalloon,
|
|
&mut epoll_threads,
|
|
&self.exit_evt,
|
|
move || handler.run(paused, paused_sync.unwrap()),
|
|
)?;
|
|
self.common.epoll_threads = Some(epoll_threads);
|
|
|
|
event!("virtio-device", "activated", "id", &self.id);
|
|
Ok(())
|
|
}
|
|
|
|
fn reset(&mut self) -> Option<Arc<dyn VirtioInterrupt>> {
|
|
let result = self.common.reset();
|
|
event!("virtio-device", "reset", "id", &self.id);
|
|
result
|
|
}
|
|
}
|
|
|
|
impl Pausable for Balloon {
|
|
fn pause(&mut self) -> result::Result<(), MigratableError> {
|
|
self.common.pause()
|
|
}
|
|
|
|
fn resume(&mut self) -> result::Result<(), MigratableError> {
|
|
self.common.resume()
|
|
}
|
|
}
|
|
|
|
impl Snapshottable for Balloon {
|
|
fn id(&self) -> String {
|
|
self.id.clone()
|
|
}
|
|
|
|
fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
|
|
Snapshot::new_from_state(&self.state())
|
|
}
|
|
}
|
|
impl Transportable for Balloon {}
|
|
impl Migratable for Balloon {}
|