mirror of
https://github.com/cloud-hypervisor/cloud-hypervisor.git
synced 2024-11-05 03:21:13 +00:00
2a6eb31d5b
Split the generic virtio code (queues and device type) from the VirtioDevice trait, transport and device implementations. This also simplifies the feature handling in vhost_user_backend as the vm-virtio crate is no longer has any features. Signed-off-by: Rob Bradford <robert.bradford@intel.com>
678 lines
24 KiB
Rust
678 lines
24 KiB
Rust
// Copyright 2019 Intel Corporation. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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use super::Error as DeviceError;
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use super::{
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ActivateError, ActivateResult, DeviceEventT, Queue, VirtioDevice, VirtioDeviceType,
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VirtioInterruptType, VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_VERSION_1,
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};
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use crate::VirtioInterrupt;
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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::collections::VecDeque;
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use std::fs::File;
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use std::io;
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use std::io::Write;
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use std::ops::DerefMut;
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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, AtomicU64, Ordering};
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use std::sync::{Arc, Mutex};
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use std::thread;
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use vm_memory::{ByteValued, Bytes, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
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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 = 2;
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const QUEUE_SIZES: &[u16] = &[QUEUE_SIZE; NUM_QUEUES];
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// New descriptors are pending on the virtio queue.
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const INPUT_QUEUE_EVENT: DeviceEventT = 0;
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const OUTPUT_QUEUE_EVENT: DeviceEventT = 1;
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// Some input from the VMM is ready to be injected into the VM.
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const INPUT_EVENT: DeviceEventT = 2;
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// The device has been dropped.
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const KILL_EVENT: DeviceEventT = 3;
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// Console configuration change event is triggered.
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const CONFIG_EVENT: DeviceEventT = 4;
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// The device should be paused.
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const PAUSE_EVENT: DeviceEventT = 5;
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//Console size feature bit
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const VIRTIO_CONSOLE_F_SIZE: u64 = 0;
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#[derive(Copy, Clone, Debug, Default, Deserialize)]
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#[repr(C, packed)]
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pub struct VirtioConsoleConfig {
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cols: u16,
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rows: u16,
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max_nr_ports: u32,
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emerg_wr: u32,
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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 VirtioConsoleConfig {
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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 cols = self.cols;
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let rows = self.rows;
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let max_nr_ports = self.max_nr_ports;
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let emerg_wr = self.emerg_wr;
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let mut virtio_console_config = serializer.serialize_struct("VirtioConsoleConfig", 12)?;
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virtio_console_config.serialize_field("cols", &cols)?;
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virtio_console_config.serialize_field("rows", &rows)?;
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virtio_console_config.serialize_field("max_nr_ports", &max_nr_ports)?;
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virtio_console_config.serialize_field("emerg_wr", &emerg_wr)?;
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virtio_console_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 VirtioConsoleConfig {}
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struct ConsoleEpollHandler {
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queues: Vec<Queue>,
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mem: GuestMemoryAtomic<GuestMemoryMmap>,
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interrupt_cb: Arc<dyn VirtioInterrupt>,
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in_buffer: Arc<Mutex<VecDeque<u8>>>,
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out: Arc<Mutex<Box<dyn io::Write + Send + Sync + 'static>>>,
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input_queue_evt: EventFd,
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output_queue_evt: EventFd,
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input_evt: EventFd,
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config_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 ConsoleEpollHandler {
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/*
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* Each port of virtio console device has one receive
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* queue. One or more empty buffers are placed by the
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* dirver in the receive queue for incoming data. Here,
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* we place the input data to these empty buffers.
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*/
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fn process_input_queue(&mut self) -> bool {
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let mut in_buffer = self.in_buffer.lock().unwrap();
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let recv_queue = &mut self.queues[0]; //receiveq
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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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if in_buffer.is_empty() {
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return false;
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}
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let mem = self.mem.memory();
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for avail_desc in recv_queue.iter(&mem) {
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let len = cmp::min(avail_desc.len as u32, in_buffer.len() as u32);
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let source_slice = in_buffer.drain(..len as usize).collect::<Vec<u8>>();
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if let Err(e) = mem.write_slice(&source_slice[..], avail_desc.addr) {
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error!("Failed to write slice: {:?}", e);
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recv_queue.go_to_previous_position();
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break;
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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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if in_buffer.is_empty() {
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break;
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}
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}
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for &(desc_index, len) in &used_desc_heads[..used_count] {
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recv_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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/*
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* Each port of virtio console device has one transmit
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* queue. For outgoing data, characters are placed in
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* the transmit queue by the driver. Therefore, here
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* we read data from the transmit queue and flush them
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* to the referenced address.
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*/
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fn process_output_queue(&mut self) -> bool {
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let trans_queue = &mut self.queues[1]; //transmitq
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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 trans_queue.iter(&mem) {
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let len;
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let mut out = self.out.lock().unwrap();
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let _ = mem.write_to(
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avail_desc.addr,
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&mut out.deref_mut(),
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avail_desc.len as usize,
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);
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let _ = out.flush();
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len = avail_desc.len;
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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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trans_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.queues[0]))
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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.input_queue_evt.as_raw_fd(),
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epoll::Event::new(epoll::Events::EPOLLIN, u64::from(INPUT_QUEUE_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.output_queue_evt.as_raw_fd(),
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epoll::Event::new(epoll::Events::EPOLLIN, u64::from(OUTPUT_QUEUE_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.input_evt.as_raw_fd(),
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epoll::Event::new(epoll::Events::EPOLLIN, u64::from(INPUT_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.config_evt.as_raw_fd(),
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epoll::Event::new(epoll::Events::EPOLLIN, u64::from(CONFIG_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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// Before jumping into the epoll loop, check if the device is expected
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// to be in a paused state. This is helpful for the restore code path
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// as the device thread should not start processing anything before the
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// device has been resumed.
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while paused.load(Ordering::SeqCst) {
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thread::park();
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}
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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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INPUT_QUEUE_EVENT => {
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if let Err(e) = self.input_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_input_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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OUTPUT_QUEUE_EVENT => {
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if let Err(e) = self.output_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 {
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self.process_output_queue();
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}
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}
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INPUT_EVENT => {
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if let Err(e) = self.input_evt.read() {
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error!("Failed to get input event: {:?}", e);
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break 'epoll;
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} else if self.process_input_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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CONFIG_EVENT => {
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if let Err(e) = self.config_evt.read() {
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error!("Failed to get config event: {:?}", e);
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break 'epoll;
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} else if let Err(e) = self
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.interrupt_cb
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.trigger(&VirtioInterruptType::Config, None)
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{
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error!("Failed to signal console driver: {:?}", e);
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}
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}
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KILL_EVENT => {
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debug!("KILL_EVENT received, stopping epoll loop");
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break 'epoll;
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}
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PAUSE_EVENT => {
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debug!("PAUSE_EVENT received, pausing virtio-console 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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// Drain pause event after the device has been resumed.
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// This ensures the pause event has been seen by each
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// and every thread related to this virtio device.
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let _ = self.pause_evt.read();
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}
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_ => {
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error!("Unknown event for virtio-console");
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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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/// Input device.
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pub struct ConsoleInput {
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input_evt: EventFd,
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config_evt: EventFd,
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in_buffer: Arc<Mutex<VecDeque<u8>>>,
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config: Arc<Mutex<VirtioConsoleConfig>>,
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acked_features: AtomicU64,
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}
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impl ConsoleInput {
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pub fn queue_input_bytes(&self, input: &[u8]) {
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let mut in_buffer = self.in_buffer.lock().unwrap();
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in_buffer.extend(input);
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let _ = self.input_evt.write(1);
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}
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pub fn update_console_size(&self, cols: u16, rows: u16) {
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if self
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.acked_features
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.fetch_and(1u64 << VIRTIO_CONSOLE_F_SIZE, Ordering::SeqCst)
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!= 0
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{
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self.config.lock().unwrap().update_console_size(cols, rows);
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//Send the interrupt to the driver
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let _ = self.config_evt.write(1);
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}
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}
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}
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impl VirtioConsoleConfig {
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pub fn new(cols: u16, rows: u16) -> Self {
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VirtioConsoleConfig {
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cols,
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rows,
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max_nr_ports: 1u32,
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emerg_wr: 0u32,
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}
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}
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pub fn update_console_size(&mut self, cols: u16, rows: u16) {
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self.cols = cols;
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self.rows = rows;
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}
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}
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/// Virtio device for exposing console to the guest OS through virtio.
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pub struct Console {
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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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avail_features: u64,
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acked_features: u64,
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config: Arc<Mutex<VirtioConsoleConfig>>,
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input: Arc<ConsoleInput>,
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out: Arc<Mutex<Box<dyn io::Write + Send + Sync + 'static>>>,
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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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}
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#[derive(Serialize, Deserialize)]
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pub struct ConsoleState {
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avail_features: u64,
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acked_features: u64,
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config: VirtioConsoleConfig,
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in_buffer: VecDeque<u8>,
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}
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impl Console {
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/// Create a new virtio console device that gets random data from /dev/urandom.
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pub fn new(
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id: String,
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out: Box<dyn io::Write + Send + Sync + 'static>,
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cols: u16,
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rows: u16,
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iommu: bool,
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) -> io::Result<(Console, Arc<ConsoleInput>)> {
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let mut avail_features = 1u64 << VIRTIO_F_VERSION_1 | 1u64 << VIRTIO_CONSOLE_F_SIZE;
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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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let input_evt = EventFd::new(EFD_NONBLOCK).unwrap();
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let config_evt = EventFd::new(EFD_NONBLOCK).unwrap();
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let console_config = Arc::new(Mutex::new(VirtioConsoleConfig::new(cols, rows)));
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let console_input = Arc::new(ConsoleInput {
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input_evt,
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config_evt,
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in_buffer: Arc::new(Mutex::new(VecDeque::new())),
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config: console_config.clone(),
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acked_features: AtomicU64::new(0),
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});
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Ok((
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Console {
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id,
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kill_evt: None,
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pause_evt: None,
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avail_features,
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acked_features: 0u64,
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config: console_config,
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input: console_input.clone(),
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out: Arc::new(Mutex::new(out)),
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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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},
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console_input,
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))
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}
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fn state(&self) -> ConsoleState {
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ConsoleState {
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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.lock().unwrap()),
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in_buffer: self.input.in_buffer.lock().unwrap().clone(),
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}
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}
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fn set_state(&mut self, state: &ConsoleState) -> 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.lock().unwrap()) = state.config;
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*(self.input.in_buffer.lock().unwrap()) = state.in_buffer.clone();
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Ok(())
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}
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}
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impl Drop for Console {
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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 Console {
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fn device_type(&self) -> u32 {
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VirtioDeviceType::TYPE_CONSOLE 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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|
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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 = self.config.lock().unwrap();
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let config_slice = 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!("No device specific configration requires write");
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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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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);
|
|
|
|
let (self_pause_evt, pause_evt) = EventFd::new(EFD_NONBLOCK)
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|
.and_then(|e| Ok((e.try_clone()?, e)))
|
|
.map_err(|e| {
|
|
error!("failed creating pause EventFd pair: {}", e);
|
|
ActivateError::BadActivate
|
|
})?;
|
|
self.pause_evt = Some(self_pause_evt);
|
|
|
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// Save the interrupt EventFD as we need to return it on reset
|
|
// 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);
|
|
|
|
self.input
|
|
.acked_features
|
|
.store(self.acked_features, Ordering::Relaxed);
|
|
|
|
if (self.acked_features & (1u64 << VIRTIO_CONSOLE_F_SIZE)) != 0 {
|
|
if let Err(e) = interrupt_cb.trigger(&VirtioInterruptType::Config, None) {
|
|
error!("Failed to signal console driver: {:?}", e);
|
|
}
|
|
}
|
|
|
|
let mut handler = ConsoleEpollHandler {
|
|
queues,
|
|
mem,
|
|
interrupt_cb,
|
|
in_buffer: self.input.in_buffer.clone(),
|
|
out: self.out.clone(),
|
|
input_queue_evt: queue_evts.remove(0),
|
|
output_queue_evt: queue_evts.remove(0),
|
|
input_evt: self.input.input_evt.try_clone().unwrap(),
|
|
config_evt: self.input.config_evt.try_clone().unwrap(),
|
|
kill_evt,
|
|
pause_evt,
|
|
};
|
|
|
|
let paused = self.paused.clone();
|
|
let mut epoll_threads = Vec::new();
|
|
thread::Builder::new()
|
|
.name("virtio_console".to_string())
|
|
.spawn(move || handler.run(paused))
|
|
.map(|thread| epoll_threads.push(thread))
|
|
.map_err(|e| {
|
|
error!("failed to clone the virtio-console epoll thread: {}", e);
|
|
ActivateError::BadActivate
|
|
})?;
|
|
|
|
self.epoll_threads = Some(epoll_threads);
|
|
|
|
Ok(())
|
|
}
|
|
|
|
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(),
|
|
))
|
|
}
|
|
}
|
|
|
|
virtio_pausable!(Console);
|
|
impl Snapshottable for Console {
|
|
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 console_snapshot = Snapshot::new(self.id.as_str());
|
|
console_snapshot.add_data_section(SnapshotDataSection {
|
|
id: format!("{}-section", self.id),
|
|
snapshot,
|
|
});
|
|
|
|
Ok(console_snapshot)
|
|
}
|
|
|
|
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
|
|
if let Some(console_section) = snapshot.snapshot_data.get(&format!("{}-section", self.id)) {
|
|
let console_state = match serde_json::from_slice(&console_section.snapshot) {
|
|
Ok(state) => state,
|
|
Err(error) => {
|
|
return Err(MigratableError::Restore(anyhow!(
|
|
"Could not deserialize CONSOLE {}",
|
|
error
|
|
)))
|
|
}
|
|
};
|
|
|
|
return self.set_state(&console_state).map_err(|e| {
|
|
MigratableError::Restore(anyhow!("Could not restore CONSOLE state {:?}", e))
|
|
});
|
|
}
|
|
|
|
Err(MigratableError::Restore(anyhow!(
|
|
"Could not find CONSOLE snapshot section"
|
|
)))
|
|
}
|
|
}
|
|
impl Transportable for Console {}
|
|
impl Migratable for Console {}
|