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Shutdown the VMM in the virtio (or VMM side of vhost-user) thread panics. See: #3031 Signed-off-by: Rob Bradford <robert.bradford@intel.com>
670 lines
23 KiB
Rust
670 lines
23 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 © 2020 Intel Corporation
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//
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// SPDX-License-Identifier: Apache-2.0 AND BSD-3-Clause
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use super::Error as DeviceError;
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use super::{
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ActivateError, ActivateResult, EpollHelper, EpollHelperError, EpollHelperHandler, Queue,
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RateLimiterConfig, VirtioCommon, VirtioDevice, VirtioDeviceType, VirtioInterruptType,
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EPOLL_HELPER_EVENT_LAST,
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};
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use crate::seccomp_filters::Thread;
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use crate::thread_helper::spawn_virtio_thread;
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use crate::GuestMemoryMmap;
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use crate::VirtioInterrupt;
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use block_util::{
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async_io::AsyncIo, async_io::AsyncIoError, async_io::DiskFile, build_disk_image_id, Request,
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RequestType, VirtioBlockConfig,
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};
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use rate_limiter::{RateLimiter, TokenType};
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use seccompiler::SeccompAction;
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use std::io;
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use std::num::Wrapping;
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use std::os::unix::io::AsRawFd;
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use std::path::PathBuf;
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use std::result;
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use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
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use std::sync::{Arc, Barrier};
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use std::{collections::HashMap, convert::TryInto};
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use versionize::{VersionMap, Versionize, VersionizeResult};
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use versionize_derive::Versionize;
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use virtio_bindings::bindings::virtio_blk::*;
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use vm_memory::{ByteValued, Bytes, GuestAddressSpace, GuestMemoryAtomic};
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use vm_migration::VersionMapped;
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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 SECTOR_SHIFT: u8 = 9;
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pub const SECTOR_SIZE: u64 = 0x01 << SECTOR_SHIFT;
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// New descriptors are pending on the virtio queue.
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const QUEUE_AVAIL_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 1;
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// New completed tasks are pending on the completion ring.
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const COMPLETION_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 2;
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// New 'wake up' event from the rate limiter
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const RATE_LIMITER_EVENT: u16 = EPOLL_HELPER_EVENT_LAST + 3;
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#[derive(Debug)]
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pub enum Error {
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/// Failed to parse the request.
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RequestParsing(block_util::Error),
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/// Failed to execute the request.
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RequestExecuting(block_util::ExecuteError),
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/// Missing the expected entry in the list of requests.
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MissingEntryRequestList,
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/// The asynchronous request returned with failure.
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AsyncRequestFailure,
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/// Failed synchronizing the file
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Fsync(AsyncIoError),
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}
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pub type Result<T> = result::Result<T, Error>;
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#[derive(Default, Clone)]
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pub struct BlockCounters {
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read_bytes: Arc<AtomicU64>,
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read_ops: Arc<AtomicU64>,
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write_bytes: Arc<AtomicU64>,
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write_ops: Arc<AtomicU64>,
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}
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struct BlockEpollHandler {
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queue: Queue,
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mem: GuestMemoryAtomic<GuestMemoryMmap>,
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disk_image: Box<dyn AsyncIo>,
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disk_nsectors: u64,
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interrupt_cb: Arc<dyn VirtioInterrupt>,
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disk_image_id: Vec<u8>,
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kill_evt: EventFd,
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pause_evt: EventFd,
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writeback: Arc<AtomicBool>,
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counters: BlockCounters,
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queue_evt: EventFd,
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request_list: HashMap<u16, Request>,
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rate_limiter: Option<RateLimiter>,
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}
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impl BlockEpollHandler {
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fn process_queue_submit(&mut self) -> Result<bool> {
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let queue = &mut self.queue;
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let mem = self.mem.memory();
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let mut used_desc_heads = Vec::new();
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let mut used_count = 0;
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for avail_desc in queue.iter(&mem) {
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let mut request = Request::parse(&avail_desc, &mem).map_err(Error::RequestParsing)?;
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if let Some(rate_limiter) = &mut self.rate_limiter {
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// If limiter.consume() fails it means there is no more TokenType::Ops
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// budget and rate limiting is in effect.
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if !rate_limiter.consume(1, TokenType::Ops) {
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// Stop processing the queue and return this descriptor chain to the
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// avail ring, for later processing.
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queue.go_to_previous_position();
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break;
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}
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// Exercise the rate limiter only if this request is of data transfer type.
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if request.request_type == RequestType::In
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|| request.request_type == RequestType::Out
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{
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let mut bytes = Wrapping(0);
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for (_, data_len) in &request.data_descriptors {
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bytes += Wrapping(*data_len as u64);
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}
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// If limiter.consume() fails it means there is no more TokenType::Bytes
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// budget and rate limiting is in effect.
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if !rate_limiter.consume(bytes.0, TokenType::Bytes) {
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// Revert the OPS consume().
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rate_limiter.manual_replenish(1, TokenType::Ops);
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// Stop processing the queue and return this descriptor chain to the
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// avail ring, for later processing.
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queue.go_to_previous_position();
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break;
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}
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};
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}
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request.set_writeback(self.writeback.load(Ordering::Acquire));
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if request
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.execute_async(
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&mem,
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self.disk_nsectors,
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self.disk_image.as_mut(),
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&self.disk_image_id,
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avail_desc.index as u64,
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)
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.map_err(Error::RequestExecuting)?
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{
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self.request_list.insert(avail_desc.index, request);
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} else {
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// We use unwrap because the request parsing process already
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// checked that the status_addr was valid.
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mem.write_obj(VIRTIO_BLK_S_OK, request.status_addr).unwrap();
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// If no asynchronous operation has been submitted, we can
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// simply return the used descriptor.
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used_desc_heads.push((avail_desc.index, 0));
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used_count += 1;
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}
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}
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for &(desc_index, len) in used_desc_heads.iter() {
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queue.add_used(&mem, desc_index, len);
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}
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Ok(used_count > 0)
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}
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fn process_queue_complete(&mut self) -> Result<bool> {
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let queue = &mut self.queue;
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let mut used_desc_heads = Vec::new();
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let mut used_count = 0;
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let mem = self.mem.memory();
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let mut read_bytes = Wrapping(0);
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let mut write_bytes = Wrapping(0);
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let mut read_ops = Wrapping(0);
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let mut write_ops = Wrapping(0);
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let completion_list = self.disk_image.complete();
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for (user_data, result) in completion_list {
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let desc_index = user_data as u16;
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let request = self
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.request_list
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.remove(&desc_index)
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.ok_or(Error::MissingEntryRequestList)?;
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let (status, len) = if result >= 0 {
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match request.request_type {
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RequestType::In => {
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for (_, data_len) in &request.data_descriptors {
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read_bytes += Wrapping(*data_len as u64);
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}
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read_ops += Wrapping(1);
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}
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RequestType::Out => {
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if !request.writeback {
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self.disk_image.fsync(None).map_err(Error::Fsync)?;
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}
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for (_, data_len) in &request.data_descriptors {
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write_bytes += Wrapping(*data_len as u64);
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}
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write_ops += Wrapping(1);
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}
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_ => {}
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}
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(VIRTIO_BLK_S_OK, result as u32)
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} else {
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error!(
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"Request failed: {:?}",
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io::Error::from_raw_os_error(-result)
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);
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return Err(Error::AsyncRequestFailure);
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};
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// We use unwrap because the request parsing process already
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// checked that the status_addr was valid.
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mem.write_obj(status, request.status_addr).unwrap();
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used_desc_heads.push((desc_index as u16, len));
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used_count += 1;
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}
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for &(desc_index, len) in used_desc_heads.iter() {
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queue.add_used(&mem, desc_index, len);
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}
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self.counters
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.write_bytes
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.fetch_add(write_bytes.0, Ordering::AcqRel);
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self.counters
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.write_ops
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.fetch_add(write_ops.0, Ordering::AcqRel);
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self.counters
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.read_bytes
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.fetch_add(read_bytes.0, Ordering::AcqRel);
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self.counters
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.read_ops
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.fetch_add(read_ops.0, Ordering::AcqRel);
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Ok(used_count > 0)
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}
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fn signal_used_queue(&self) -> result::Result<(), DeviceError> {
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self.interrupt_cb
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.trigger(&VirtioInterruptType::Queue, Some(&self.queue))
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.map_err(|e| {
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error!("Failed to signal used queue: {:?}", e);
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DeviceError::FailedSignalingUsedQueue(e)
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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.queue_evt.as_raw_fd(), QUEUE_AVAIL_EVENT)?;
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helper.add_event(self.disk_image.notifier().as_raw_fd(), COMPLETION_EVENT)?;
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if let Some(rate_limiter) = &self.rate_limiter {
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helper.add_event(rate_limiter.as_raw_fd(), RATE_LIMITER_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 BlockEpollHandler {
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fn handle_event(&mut self, _helper: &mut EpollHelper, event: &epoll::Event) -> bool {
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let ev_type = event.data as u16;
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match ev_type {
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QUEUE_AVAIL_EVENT => {
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if let Err(e) = self.queue_evt.read() {
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error!("Failed to get queue event: {:?}", e);
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return true;
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}
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let rate_limit_reached =
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self.rate_limiter.as_ref().map_or(false, |r| r.is_blocked());
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// Process the queue only when the rate limit is not reached
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if !rate_limit_reached {
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match self.process_queue_submit() {
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Ok(needs_notification) => {
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if needs_notification {
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if let Err(e) = self.signal_used_queue() {
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error!("Failed to signal used queue: {:?}", e);
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return true;
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}
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}
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}
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Err(e) => {
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error!("Failed to process queue (submit): {:?}", e);
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return true;
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}
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}
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}
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}
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COMPLETION_EVENT => {
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if let Err(e) = self.disk_image.notifier().read() {
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error!("Failed to get queue event: {:?}", e);
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return true;
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}
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match self.process_queue_complete() {
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Ok(needs_notification) => {
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if needs_notification {
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if let Err(e) = self.signal_used_queue() {
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error!("Failed to signal used queue: {:?}", e);
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return true;
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}
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}
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}
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Err(e) => {
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error!("Failed to process queue (complete): {:?}", e);
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return true;
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}
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}
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}
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RATE_LIMITER_EVENT => {
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if let Some(rate_limiter) = &mut self.rate_limiter {
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// Upon rate limiter event, call the rate limiter handler
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// and restart processing the queue.
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if rate_limiter.event_handler().is_ok() {
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match self.process_queue_submit() {
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Ok(needs_notification) => {
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if needs_notification {
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if let Err(e) = self.signal_used_queue() {
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error!("Failed to signal used queue: {:?}", e);
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return true;
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}
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}
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}
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Err(e) => {
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error!("Failed to process queue (submit): {:?}", e);
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return true;
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}
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}
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}
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} else {
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error!("Unexpected 'RATE_LIMITER_EVENT' when rate_limiter is not enabled.");
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return true;
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}
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}
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_ => {
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error!("Unexpected event: {}", ev_type);
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return true;
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}
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}
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false
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}
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}
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/// Virtio device for exposing block level read/write operations on a host file.
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pub struct Block {
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common: VirtioCommon,
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id: String,
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disk_image: Box<dyn DiskFile>,
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disk_path: PathBuf,
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disk_nsectors: u64,
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config: VirtioBlockConfig,
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writeback: Arc<AtomicBool>,
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counters: BlockCounters,
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seccomp_action: SeccompAction,
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rate_limiter_config: Option<RateLimiterConfig>,
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exit_evt: EventFd,
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}
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#[derive(Versionize)]
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pub struct BlockState {
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pub disk_path: String,
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pub disk_nsectors: u64,
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pub avail_features: u64,
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pub acked_features: u64,
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pub config: VirtioBlockConfig,
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}
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impl VersionMapped for BlockState {}
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impl Block {
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/// Create a new virtio block device that operates on the given file.
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#[allow(clippy::too_many_arguments)]
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pub fn new(
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id: String,
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mut disk_image: Box<dyn DiskFile>,
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disk_path: PathBuf,
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is_disk_read_only: bool,
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iommu: bool,
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num_queues: usize,
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queue_size: u16,
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seccomp_action: SeccompAction,
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rate_limiter_config: Option<RateLimiterConfig>,
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exit_evt: EventFd,
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) -> io::Result<Self> {
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let disk_size = disk_image.size().map_err(|e| {
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io::Error::new(
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io::ErrorKind::Other,
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format!("Failed getting disk size: {}", e),
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)
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})?;
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if disk_size % SECTOR_SIZE != 0 {
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warn!(
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"Disk size {} is not a multiple of sector size {}; \
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the remainder will not be visible to the guest.",
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disk_size, SECTOR_SIZE
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);
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}
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let mut avail_features = (1u64 << VIRTIO_F_VERSION_1)
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| (1u64 << VIRTIO_BLK_F_FLUSH)
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| (1u64 << VIRTIO_BLK_F_CONFIG_WCE);
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if iommu {
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avail_features |= 1u64 << VIRTIO_F_IOMMU_PLATFORM;
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}
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if is_disk_read_only {
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avail_features |= 1u64 << VIRTIO_BLK_F_RO;
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}
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let disk_nsectors = disk_size / SECTOR_SIZE;
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let mut config = VirtioBlockConfig {
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capacity: disk_nsectors,
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writeback: 1,
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..Default::default()
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};
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if num_queues > 1 {
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avail_features |= 1u64 << VIRTIO_BLK_F_MQ;
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config.num_queues = num_queues as u16;
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}
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Ok(Block {
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common: VirtioCommon {
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device_type: VirtioDeviceType::Block as u32,
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avail_features,
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paused_sync: Some(Arc::new(Barrier::new(num_queues + 1))),
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queue_sizes: vec![queue_size; num_queues],
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min_queues: 1,
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..Default::default()
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},
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id,
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disk_image,
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disk_path,
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disk_nsectors,
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config,
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writeback: Arc::new(AtomicBool::new(true)),
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counters: BlockCounters::default(),
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seccomp_action,
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rate_limiter_config,
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exit_evt,
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})
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}
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fn state(&self) -> BlockState {
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BlockState {
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disk_path: self.disk_path.to_str().unwrap().to_owned(),
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disk_nsectors: self.disk_nsectors,
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avail_features: self.common.avail_features,
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acked_features: self.common.acked_features,
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config: self.config,
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}
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}
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fn set_state(&mut self, state: &BlockState) {
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self.disk_path = state.disk_path.clone().into();
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self.disk_nsectors = state.disk_nsectors;
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self.common.avail_features = state.avail_features;
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self.common.acked_features = state.acked_features;
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self.config = state.config;
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}
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fn update_writeback(&mut self) {
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// Use writeback from config if VIRTIO_BLK_F_CONFIG_WCE
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let writeback = if self.common.feature_acked(VIRTIO_BLK_F_CONFIG_WCE.into()) {
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self.config.writeback == 1
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} else {
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// Else check if VIRTIO_BLK_F_FLUSH negotiated
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self.common.feature_acked(VIRTIO_BLK_F_FLUSH.into())
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};
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info!(
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"Changing cache mode to {}",
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if writeback {
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"writeback"
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} else {
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"writethrough"
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}
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);
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self.writeback.store(writeback, Ordering::Release);
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}
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}
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impl Drop for Block {
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fn drop(&mut self) {
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if let Some(kill_evt) = self.common.kill_evt.take() {
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// Ignore the result because there is nothing we can do about it.
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let _ = kill_evt.write(1);
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}
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}
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}
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impl VirtioDevice for Block {
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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 "writeback" field is the only mutable field
|
|
let writeback_offset =
|
|
(&self.config.writeback as *const _ as u64) - (&self.config as *const _ as u64);
|
|
if offset != writeback_offset || data.len() != std::mem::size_of_val(&self.config.writeback)
|
|
{
|
|
error!(
|
|
"Attempt to write to read-only field: offset {:x} length {}",
|
|
offset,
|
|
data.len()
|
|
);
|
|
return;
|
|
}
|
|
|
|
self.config.writeback = data[0];
|
|
self.update_writeback();
|
|
}
|
|
|
|
fn activate(
|
|
&mut self,
|
|
mem: GuestMemoryAtomic<GuestMemoryMmap>,
|
|
interrupt_cb: Arc<dyn VirtioInterrupt>,
|
|
mut queues: Vec<Queue>,
|
|
mut queue_evts: Vec<EventFd>,
|
|
) -> ActivateResult {
|
|
self.common.activate(&queues, &queue_evts, &interrupt_cb)?;
|
|
|
|
let disk_image_id = build_disk_image_id(&self.disk_path);
|
|
self.update_writeback();
|
|
|
|
let mut epoll_threads = Vec::new();
|
|
for i in 0..queues.len() {
|
|
let queue_evt = queue_evts.remove(0);
|
|
let queue = queues.remove(0);
|
|
let queue_size = queue.size;
|
|
let (kill_evt, pause_evt) = self.common.dup_eventfds();
|
|
|
|
let rate_limiter: Option<RateLimiter> = self
|
|
.rate_limiter_config
|
|
.map(RateLimiterConfig::try_into)
|
|
.transpose()
|
|
.map_err(ActivateError::CreateRateLimiter)?;
|
|
|
|
let mut handler = BlockEpollHandler {
|
|
queue,
|
|
mem: mem.clone(),
|
|
disk_image: self
|
|
.disk_image
|
|
.new_async_io(queue_size as u32)
|
|
.map_err(|e| {
|
|
error!("failed to create new AsyncIo: {}", e);
|
|
ActivateError::BadActivate
|
|
})?,
|
|
disk_nsectors: self.disk_nsectors,
|
|
interrupt_cb: interrupt_cb.clone(),
|
|
disk_image_id: disk_image_id.clone(),
|
|
kill_evt,
|
|
pause_evt,
|
|
writeback: self.writeback.clone(),
|
|
counters: self.counters.clone(),
|
|
queue_evt,
|
|
request_list: HashMap::with_capacity(queue_size.into()),
|
|
rate_limiter,
|
|
};
|
|
|
|
let paused = self.common.paused.clone();
|
|
let paused_sync = self.common.paused_sync.clone();
|
|
|
|
spawn_virtio_thread(
|
|
&format!("{}_q{}", self.id.clone(), i),
|
|
&self.seccomp_action,
|
|
Thread::VirtioBlock,
|
|
&mut epoll_threads,
|
|
&self.exit_evt,
|
|
move || {
|
|
if let Err(e) = handler.run(paused, paused_sync.unwrap()) {
|
|
error!("Error running worker: {:?}", e);
|
|
}
|
|
},
|
|
)?;
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
fn counters(&self) -> Option<HashMap<&'static str, Wrapping<u64>>> {
|
|
let mut counters = HashMap::new();
|
|
|
|
counters.insert(
|
|
"read_bytes",
|
|
Wrapping(self.counters.read_bytes.load(Ordering::Acquire)),
|
|
);
|
|
counters.insert(
|
|
"write_bytes",
|
|
Wrapping(self.counters.write_bytes.load(Ordering::Acquire)),
|
|
);
|
|
counters.insert(
|
|
"read_ops",
|
|
Wrapping(self.counters.read_ops.load(Ordering::Acquire)),
|
|
);
|
|
counters.insert(
|
|
"write_ops",
|
|
Wrapping(self.counters.write_ops.load(Ordering::Acquire)),
|
|
);
|
|
|
|
Some(counters)
|
|
}
|
|
}
|
|
|
|
impl Pausable for Block {
|
|
fn pause(&mut self) -> result::Result<(), MigratableError> {
|
|
self.common.pause()
|
|
}
|
|
|
|
fn resume(&mut self) -> result::Result<(), MigratableError> {
|
|
self.common.resume()
|
|
}
|
|
}
|
|
|
|
impl Snapshottable for Block {
|
|
fn id(&self) -> String {
|
|
self.id.clone()
|
|
}
|
|
|
|
fn snapshot(&mut self) -> std::result::Result<Snapshot, MigratableError> {
|
|
Snapshot::new_from_versioned_state(&self.id(), &self.state())
|
|
}
|
|
|
|
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
|
|
self.set_state(&snapshot.to_versioned_state(&self.id)?);
|
|
Ok(())
|
|
}
|
|
}
|
|
impl Transportable for Block {}
|
|
impl Migratable for Block {}
|