mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-08-21 07:21:15 +00:00
These are mostly due to use of "bare use" statements and unnecessary vector creation. Signed-off-by: Rob Bradford <robert.bradford@intel.com>
621 lines
20 KiB
Rust
621 lines
20 KiB
Rust
// Copyright 2019 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 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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use super::Error as DeviceError;
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use super::{
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ActivateError, ActivateResult, DescriptorChain, DeviceEventT, Queue, UserspaceMapping,
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VirtioDevice, VirtioDeviceType, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_VERSION_1,
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};
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use crate::{VirtioInterrupt, VirtioInterruptType};
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use anyhow::anyhow;
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use libc::EFD_NONBLOCK;
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use serde::ser::{Serialize, SerializeStruct, Serializer};
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use std::cmp;
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use std::fmt::{self, Display};
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use std::fs::File;
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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, FromRawFd};
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use std::result;
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use std::sync::atomic::{AtomicBool, Ordering};
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use std::sync::Arc;
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use std::thread;
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use vm_memory::{
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Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
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GuestMemoryError, GuestMemoryMmap, MmapRegion,
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};
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use vm_migration::{
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Migratable, MigratableError, Pausable, Snapshot, SnapshotDataSection, Snapshottable,
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Transportable,
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};
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use vmm_sys_util::eventfd::EventFd;
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const QUEUE_SIZE: u16 = 256;
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const NUM_QUEUES: usize = 1;
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const QUEUE_SIZES: &[u16] = &[QUEUE_SIZE];
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const VIRTIO_PMEM_REQ_TYPE_FLUSH: u32 = 0;
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const VIRTIO_PMEM_RESP_TYPE_OK: u32 = 0;
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const VIRTIO_PMEM_RESP_TYPE_EIO: u32 = 1;
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// New descriptors are pending on the virtio queue.
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const QUEUE_AVAIL_EVENT: DeviceEventT = 0;
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// The device has been dropped.
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const KILL_EVENT: DeviceEventT = 1;
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// The device should be paused.
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const PAUSE_EVENT: DeviceEventT = 2;
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#[derive(Copy, Clone, Debug, Default, Deserialize)]
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#[repr(C, packed)]
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struct VirtioPmemConfig {
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start: u64,
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size: u64,
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}
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// We must explicitly implement Serialize since the structure is packed and
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// it's unsafe to borrow from a packed structure. And by default, if we derive
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// Serialize from serde, it will borrow the values from the structure.
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// That's why this implementation copies each field separately before it
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// serializes the entire structure field by field.
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impl Serialize for VirtioPmemConfig {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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let start = self.start;
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let size = self.size;
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let mut virtio_pmem_config = serializer.serialize_struct("VirtioPmemConfig", 16)?;
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virtio_pmem_config.serialize_field("start", &start)?;
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virtio_pmem_config.serialize_field("size", &size)?;
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virtio_pmem_config.end()
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}
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}
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// Safe because it only has data and has no implicit padding.
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unsafe impl ByteValued for VirtioPmemConfig {}
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#[derive(Copy, Clone, Debug, Default)]
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#[repr(C)]
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struct VirtioPmemReq {
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type_: u32,
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}
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// Safe because it only has data and has no implicit padding.
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unsafe impl ByteValued for VirtioPmemReq {}
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#[derive(Copy, Clone, Debug, Default)]
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#[repr(C)]
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struct VirtioPmemResp {
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ret: u32,
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}
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// Safe because it only has data and has no implicit padding.
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unsafe impl ByteValued for VirtioPmemResp {}
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#[derive(Debug)]
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enum Error {
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/// Guest gave us bad memory addresses.
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GuestMemory(GuestMemoryError),
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/// Guest gave us a write only descriptor that protocol says to read from.
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UnexpectedWriteOnlyDescriptor,
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/// Guest gave us a read only descriptor that protocol says to write to.
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UnexpectedReadOnlyDescriptor,
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/// Guest gave us too few descriptors in a descriptor chain.
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DescriptorChainTooShort,
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/// Guest gave us a buffer that was too short to use.
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BufferLengthTooSmall,
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/// Guest sent us invalid request.
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InvalidRequest,
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}
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impl Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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use self::Error::*;
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match self {
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BufferLengthTooSmall => write!(f, "buffer length too small"),
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DescriptorChainTooShort => write!(f, "descriptor chain too short"),
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GuestMemory(e) => write!(f, "bad guest memory address: {}", e),
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InvalidRequest => write!(f, "invalid request"),
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UnexpectedReadOnlyDescriptor => write!(f, "unexpected read-only descriptor"),
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UnexpectedWriteOnlyDescriptor => write!(f, "unexpected write-only descriptor"),
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}
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}
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}
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#[derive(Debug, PartialEq)]
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enum RequestType {
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Flush,
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}
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struct Request {
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type_: RequestType,
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status_addr: GuestAddress,
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}
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impl Request {
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fn parse(
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avail_desc: &DescriptorChain,
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mem: &GuestMemoryMmap,
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) -> result::Result<Request, Error> {
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// The head contains the request type which MUST be readable.
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if avail_desc.is_write_only() {
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return Err(Error::UnexpectedWriteOnlyDescriptor);
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}
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if avail_desc.len as usize != size_of::<VirtioPmemReq>() {
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return Err(Error::InvalidRequest);
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}
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let request: VirtioPmemReq = mem.read_obj(avail_desc.addr).map_err(Error::GuestMemory)?;
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let request_type = match request.type_ {
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VIRTIO_PMEM_REQ_TYPE_FLUSH => RequestType::Flush,
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_ => return Err(Error::InvalidRequest),
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};
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let status_desc = avail_desc
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.next_descriptor()
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.ok_or(Error::DescriptorChainTooShort)?;
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// The status MUST always be writable
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if !status_desc.is_write_only() {
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return Err(Error::UnexpectedReadOnlyDescriptor);
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}
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if (status_desc.len as usize) < size_of::<VirtioPmemResp>() {
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return Err(Error::BufferLengthTooSmall);
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}
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Ok(Request {
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type_: request_type,
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status_addr: status_desc.addr,
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})
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}
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}
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struct PmemEpollHandler {
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queue: Queue,
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mem: GuestMemoryAtomic<GuestMemoryMmap>,
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disk: File,
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interrupt_cb: Arc<dyn VirtioInterrupt>,
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queue_evt: EventFd,
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kill_evt: EventFd,
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pause_evt: EventFd,
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}
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impl PmemEpollHandler {
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fn process_queue(&mut self) -> bool {
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let mut used_desc_heads = [(0, 0); QUEUE_SIZE as usize];
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let mut used_count = 0;
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let mem = self.mem.memory();
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for avail_desc in self.queue.iter(&mem) {
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let len = match Request::parse(&avail_desc, &mem) {
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Ok(ref req) if (req.type_ == RequestType::Flush) => {
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let status_code = match self.disk.sync_all() {
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Ok(()) => VIRTIO_PMEM_RESP_TYPE_OK,
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Err(e) => {
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error!("failed flushing disk image: {}", e);
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VIRTIO_PMEM_RESP_TYPE_EIO
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}
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};
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let resp = VirtioPmemResp { ret: status_code };
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match mem.write_obj(resp, req.status_addr) {
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Ok(_) => size_of::<VirtioPmemResp>() as u32,
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Err(e) => {
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error!("bad guest memory address: {}", e);
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0
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}
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}
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}
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Ok(ref req) => {
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// Currently, there is only one virtio-pmem request, FLUSH.
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error!("Invalid virtio request type {:?}", req.type_);
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0
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}
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Err(e) => {
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error!("Failed to parse available descriptor chain: {:?}", e);
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0
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}
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};
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used_desc_heads[used_count] = (avail_desc.index, len);
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used_count += 1;
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}
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for &(desc_index, len) in &used_desc_heads[..used_count] {
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self.queue.add_used(&mem, desc_index, len);
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}
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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(&mut self, paused: Arc<AtomicBool>) -> result::Result<(), DeviceError> {
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// Create the epoll file descriptor
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let epoll_fd = epoll::create(true).map_err(DeviceError::EpollCreateFd)?;
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// Use 'File' to enforce closing on 'epoll_fd'
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let epoll_file = unsafe { File::from_raw_fd(epoll_fd) };
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// Add events
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epoll::ctl(
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epoll_file.as_raw_fd(),
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epoll::ControlOptions::EPOLL_CTL_ADD,
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self.queue_evt.as_raw_fd(),
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epoll::Event::new(epoll::Events::EPOLLIN, u64::from(QUEUE_AVAIL_EVENT)),
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)
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.map_err(DeviceError::EpollCtl)?;
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epoll::ctl(
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epoll_file.as_raw_fd(),
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epoll::ControlOptions::EPOLL_CTL_ADD,
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self.kill_evt.as_raw_fd(),
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epoll::Event::new(epoll::Events::EPOLLIN, u64::from(KILL_EVENT)),
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)
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.map_err(DeviceError::EpollCtl)?;
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epoll::ctl(
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epoll_file.as_raw_fd(),
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epoll::ControlOptions::EPOLL_CTL_ADD,
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self.pause_evt.as_raw_fd(),
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epoll::Event::new(epoll::Events::EPOLLIN, u64::from(PAUSE_EVENT)),
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)
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.map_err(DeviceError::EpollCtl)?;
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const EPOLL_EVENTS_LEN: usize = 100;
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let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); EPOLL_EVENTS_LEN];
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'epoll: loop {
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let num_events = match epoll::wait(epoll_file.as_raw_fd(), -1, &mut events[..]) {
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Ok(res) => res,
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Err(e) => {
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if e.kind() == io::ErrorKind::Interrupted {
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// It's well defined from the epoll_wait() syscall
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// documentation that the epoll loop can be interrupted
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// before any of the requested events occurred or the
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// timeout expired. In both those cases, epoll_wait()
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// returns an error of type EINTR, but this should not
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// be considered as a regular error. Instead it is more
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// appropriate to retry, by calling into epoll_wait().
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continue;
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}
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return Err(DeviceError::EpollWait(e));
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}
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};
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for event in events.iter().take(num_events) {
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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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break 'epoll;
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} else if self.process_queue() {
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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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break 'epoll;
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}
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}
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}
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KILL_EVENT => {
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debug!("kill_evt received, stopping epoll loop");
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break 'epoll;
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}
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PAUSE_EVENT => {
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// Drain pause event
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let _ = self.pause_evt.read();
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debug!("PAUSE_EVENT received, pausing virtio-pmem epoll loop");
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// We loop here to handle spurious park() returns.
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// Until we have not resumed, the paused boolean will
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// be true.
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while paused.load(Ordering::SeqCst) {
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thread::park();
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}
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}
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_ => {
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error!("Unknown event for virtio-block");
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}
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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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pub struct Pmem {
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id: String,
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kill_evt: Option<EventFd>,
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pause_evt: Option<EventFd>,
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disk: Option<File>,
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avail_features: u64,
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acked_features: u64,
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config: VirtioPmemConfig,
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queue_evts: Option<Vec<EventFd>>,
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interrupt_cb: Option<Arc<dyn VirtioInterrupt>>,
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epoll_threads: Option<Vec<thread::JoinHandle<result::Result<(), DeviceError>>>>,
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paused: Arc<AtomicBool>,
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mapping: UserspaceMapping,
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// Hold ownership of the memory that is allocated for the device
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// which will be automatically dropped when the device is dropped
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_region: MmapRegion,
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}
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#[derive(Serialize, Deserialize)]
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pub struct PmemState {
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avail_features: u64,
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acked_features: u64,
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config: VirtioPmemConfig,
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}
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impl Pmem {
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pub fn new(
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id: String,
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disk: File,
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addr: GuestAddress,
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mapping: UserspaceMapping,
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_region: MmapRegion,
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iommu: bool,
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) -> io::Result<Pmem> {
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let config = VirtioPmemConfig {
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start: addr.raw_value().to_le(),
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size: (_region.size() as u64).to_le(),
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};
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let mut avail_features = 1u64 << VIRTIO_F_VERSION_1;
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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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Ok(Pmem {
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id,
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kill_evt: None,
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pause_evt: None,
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disk: Some(disk),
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avail_features,
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acked_features: 0u64,
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config,
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queue_evts: None,
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interrupt_cb: None,
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epoll_threads: None,
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paused: Arc::new(AtomicBool::new(false)),
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mapping,
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_region,
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})
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}
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fn state(&self) -> PmemState {
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PmemState {
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avail_features: self.avail_features,
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acked_features: self.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: &PmemState) -> io::Result<()> {
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self.avail_features = state.avail_features;
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self.acked_features = state.acked_features;
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self.config = state.config;
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Ok(())
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}
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}
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impl Drop for Pmem {
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fn drop(&mut self) {
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if let Some(kill_evt) = self.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 Pmem {
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fn device_type(&self) -> u32 {
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VirtioDeviceType::TYPE_PMEM as u32
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}
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fn queue_max_sizes(&self) -> &[u16] {
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QUEUE_SIZES
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}
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fn features(&self) -> u64 {
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self.avail_features
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}
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fn ack_features(&mut self, value: u64) {
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let mut v = value;
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// Check if the guest is ACK'ing a feature that we didn't claim to have.
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let unrequested_features = v & !self.avail_features;
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if unrequested_features != 0 {
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warn!("Received acknowledge request for unknown feature.");
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// Don't count these features as acked.
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v &= !unrequested_features;
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}
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self.acked_features |= v;
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}
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fn read_config(&self, offset: u64, mut data: &mut [u8]) {
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let config_slice = self.config.as_slice();
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let config_len = config_slice.len() as u64;
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if offset >= config_len {
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error!("Failed to read config space");
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return;
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}
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if let Some(end) = offset.checked_add(data.len() as u64) {
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// This write can't fail, offset and end are checked against config_len.
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data.write_all(&config_slice[offset as usize..cmp::min(end, config_len) as usize])
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.unwrap();
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}
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}
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fn write_config(&mut self, _offset: u64, _data: &[u8]) {
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warn!("virtio-pmem device configuration is read-only");
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}
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fn activate(
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&mut self,
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mem: GuestMemoryAtomic<GuestMemoryMmap>,
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interrupt_cb: Arc<dyn VirtioInterrupt>,
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mut queues: Vec<Queue>,
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mut queue_evts: Vec<EventFd>,
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) -> ActivateResult {
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if queues.len() != NUM_QUEUES || queue_evts.len() != NUM_QUEUES {
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error!(
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"Cannot perform activate. Expected {} queue(s), got {}",
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NUM_QUEUES,
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queues.len()
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);
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return Err(ActivateError::BadActivate);
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}
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let (self_kill_evt, kill_evt) = EventFd::new(EFD_NONBLOCK)
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.and_then(|e| Ok((e.try_clone()?, e)))
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.map_err(|e| {
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error!("failed creating kill EventFd pair: {}", e);
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ActivateError::BadActivate
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})?;
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self.kill_evt = Some(self_kill_evt);
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let (self_pause_evt, pause_evt) = EventFd::new(EFD_NONBLOCK)
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.and_then(|e| Ok((e.try_clone()?, e)))
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.map_err(|e| {
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error!("failed creating pause EventFd pair: {}", e);
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ActivateError::BadActivate
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})?;
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self.pause_evt = Some(self_pause_evt);
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|
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// Save the interrupt EventFD as we need to return it on reset
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// but clone it to pass into the thread.
|
|
self.interrupt_cb = Some(interrupt_cb.clone());
|
|
|
|
let mut tmp_queue_evts: Vec<EventFd> = Vec::new();
|
|
for queue_evt in queue_evts.iter() {
|
|
// Save the queue EventFD as we need to return it on reset
|
|
// but clone it to pass into the thread.
|
|
tmp_queue_evts.push(queue_evt.try_clone().map_err(|e| {
|
|
error!("failed to clone queue EventFd: {}", e);
|
|
ActivateError::BadActivate
|
|
})?);
|
|
}
|
|
self.queue_evts = Some(tmp_queue_evts);
|
|
|
|
if let Some(disk) = self.disk.as_ref() {
|
|
let disk = disk.try_clone().map_err(|e| {
|
|
error!("failed cloning pmem disk: {}", e);
|
|
ActivateError::BadActivate
|
|
})?;
|
|
let mut handler = PmemEpollHandler {
|
|
queue: queues.remove(0),
|
|
mem,
|
|
disk,
|
|
interrupt_cb,
|
|
queue_evt: queue_evts.remove(0),
|
|
kill_evt,
|
|
pause_evt,
|
|
};
|
|
|
|
let paused = self.paused.clone();
|
|
let mut epoll_threads = Vec::new();
|
|
thread::Builder::new()
|
|
.name("virtio_pmem".to_string())
|
|
.spawn(move || handler.run(paused))
|
|
.map(|thread| epoll_threads.push(thread))
|
|
.map_err(|e| {
|
|
error!("failed to clone virtio-pmem epoll thread: {}", e);
|
|
ActivateError::BadActivate
|
|
})?;
|
|
|
|
self.epoll_threads = Some(epoll_threads);
|
|
|
|
return Ok(());
|
|
}
|
|
Err(ActivateError::BadActivate)
|
|
}
|
|
|
|
fn reset(&mut self) -> Option<(Arc<dyn VirtioInterrupt>, Vec<EventFd>)> {
|
|
// We first must resume the virtio thread if it was paused.
|
|
if self.pause_evt.take().is_some() {
|
|
self.resume().ok()?;
|
|
}
|
|
|
|
if let Some(kill_evt) = self.kill_evt.take() {
|
|
// Ignore the result because there is nothing we can do about it.
|
|
let _ = kill_evt.write(1);
|
|
}
|
|
|
|
// Return the interrupt and queue EventFDs
|
|
Some((
|
|
self.interrupt_cb.take().unwrap(),
|
|
self.queue_evts.take().unwrap(),
|
|
))
|
|
}
|
|
|
|
fn userspace_mappings(&self) -> Vec<UserspaceMapping> {
|
|
vec![self.mapping.clone()]
|
|
}
|
|
}
|
|
|
|
virtio_pausable!(Pmem);
|
|
impl Snapshottable for Pmem {
|
|
fn id(&self) -> String {
|
|
self.id.clone()
|
|
}
|
|
|
|
fn snapshot(&self) -> std::result::Result<Snapshot, MigratableError> {
|
|
let snapshot =
|
|
serde_json::to_vec(&self.state()).map_err(|e| MigratableError::Snapshot(e.into()))?;
|
|
|
|
let mut pmem_snapshot = Snapshot::new(self.id.as_str());
|
|
pmem_snapshot.add_data_section(SnapshotDataSection {
|
|
id: format!("{}-section", self.id),
|
|
snapshot,
|
|
});
|
|
|
|
Ok(pmem_snapshot)
|
|
}
|
|
|
|
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
|
|
if let Some(pmem_section) = snapshot.snapshot_data.get(&format!("{}-section", self.id)) {
|
|
let pmem_state = match serde_json::from_slice(&pmem_section.snapshot) {
|
|
Ok(state) => state,
|
|
Err(error) => {
|
|
return Err(MigratableError::Restore(anyhow!(
|
|
"Could not deserialize PMEM {}",
|
|
error
|
|
)))
|
|
}
|
|
};
|
|
|
|
return self.set_state(&pmem_state).map_err(|e| {
|
|
MigratableError::Restore(anyhow!("Could not restore PMEM state {:?}", e))
|
|
});
|
|
}
|
|
|
|
Err(MigratableError::Restore(anyhow!(
|
|
"Could not find PMEM snapshot section"
|
|
)))
|
|
}
|
|
}
|
|
|
|
impl Transportable for Pmem {}
|
|
impl Migratable for Pmem {}
|