cloud-hypervisor/vm-virtio/src/rng.rs
Sebastien Boeuf 2e91b73881 vm-virtio: rng: Expect an identifier upon device creation
This identifier is chosen from the DeviceManager so that it will manage
all identifiers across the VM, which will ensure uniqueness.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
2020-04-29 19:34:31 +01:00

432 lines
14 KiB
Rust
Executable File

// Copyright 2017 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use super::Error as DeviceError;
use super::{
ActivateError, ActivateResult, DeviceEventT, Queue, VirtioDevice, VirtioDeviceType,
VIRTIO_F_IOMMU_PLATFORM, VIRTIO_F_VERSION_1,
};
use crate::{VirtioInterrupt, VirtioInterruptType};
use anyhow::anyhow;
use epoll;
use libc::EFD_NONBLOCK;
use std;
use std::fs::File;
use std::io;
use std::os::unix::io::AsRawFd;
use std::result;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::Arc;
use std::thread;
use vm_memory::{Bytes, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
use vm_migration::{
Migratable, MigratableError, Pausable, Snapshot, SnapshotDataSection, Snapshottable,
Transportable,
};
use vmm_sys_util::eventfd::EventFd;
const QUEUE_SIZE: u16 = 256;
const NUM_QUEUES: usize = 1;
const QUEUE_SIZES: &[u16] = &[QUEUE_SIZE];
// New descriptors are pending on the virtio queue.
const QUEUE_AVAIL_EVENT: DeviceEventT = 0;
// The device has been dropped.
const KILL_EVENT: DeviceEventT = 1;
// The device should be paused.
const PAUSE_EVENT: DeviceEventT = 2;
struct RngEpollHandler {
queues: Vec<Queue>,
mem: GuestMemoryAtomic<GuestMemoryMmap>,
random_file: File,
interrupt_cb: Arc<dyn VirtioInterrupt>,
queue_evt: EventFd,
kill_evt: EventFd,
pause_evt: EventFd,
}
impl RngEpollHandler {
fn process_queue(&mut self) -> bool {
let queue = &mut self.queues[0];
let mut used_desc_heads = [(0, 0); QUEUE_SIZE as usize];
let mut used_count = 0;
let mem = self.mem.memory();
for avail_desc in queue.iter(&mem) {
let mut len = 0;
// Drivers can only read from the random device.
if avail_desc.is_write_only() {
// Fill the read with data from the random device on the host.
if mem
.read_from(
avail_desc.addr,
&mut self.random_file,
avail_desc.len as usize,
)
.is_ok()
{
len = avail_desc.len;
}
}
used_desc_heads[used_count] = (avail_desc.index, len);
used_count += 1;
}
for &(desc_index, len) in &used_desc_heads[..used_count] {
queue.add_used(&mem, desc_index, len);
}
used_count > 0
}
fn signal_used_queue(&self) -> result::Result<(), DeviceError> {
self.interrupt_cb
.trigger(&VirtioInterruptType::Queue, Some(&self.queues[0]))
.map_err(|e| {
error!("Failed to signal used queue: {:?}", e);
DeviceError::FailedSignalingUsedQueue(e)
})
}
fn run(&mut self, paused: Arc<AtomicBool>) -> result::Result<(), DeviceError> {
// Create the epoll file descriptor
let epoll_fd = epoll::create(true).map_err(DeviceError::EpollCreateFd)?;
// Add events
epoll::ctl(
epoll_fd,
epoll::ControlOptions::EPOLL_CTL_ADD,
self.queue_evt.as_raw_fd(),
epoll::Event::new(epoll::Events::EPOLLIN, u64::from(QUEUE_AVAIL_EVENT)),
)
.map_err(DeviceError::EpollCtl)?;
epoll::ctl(
epoll_fd,
epoll::ControlOptions::EPOLL_CTL_ADD,
self.kill_evt.as_raw_fd(),
epoll::Event::new(epoll::Events::EPOLLIN, u64::from(KILL_EVENT)),
)
.map_err(DeviceError::EpollCtl)?;
epoll::ctl(
epoll_fd,
epoll::ControlOptions::EPOLL_CTL_ADD,
self.pause_evt.as_raw_fd(),
epoll::Event::new(epoll::Events::EPOLLIN, u64::from(PAUSE_EVENT)),
)
.map_err(DeviceError::EpollCtl)?;
const EPOLL_EVENTS_LEN: usize = 100;
let mut events = vec![epoll::Event::new(epoll::Events::empty(), 0); EPOLL_EVENTS_LEN];
'epoll: loop {
let num_events = match epoll::wait(epoll_fd, -1, &mut events[..]) {
Ok(res) => res,
Err(e) => {
if e.kind() == io::ErrorKind::Interrupted {
// It's well defined from the epoll_wait() syscall
// documentation that the epoll loop can be interrupted
// before any of the requested events occurred or the
// timeout expired. In both those cases, epoll_wait()
// returns an error of type EINTR, but this should not
// be considered as a regular error. Instead it is more
// appropriate to retry, by calling into epoll_wait().
continue;
}
return Err(DeviceError::EpollWait(e));
}
};
for event in events.iter().take(num_events) {
let ev_type = event.data as u16;
match ev_type {
QUEUE_AVAIL_EVENT => {
if let Err(e) = self.queue_evt.read() {
error!("Failed to get queue event: {:?}", e);
break 'epoll;
} else if self.process_queue() {
if let Err(e) = self.signal_used_queue() {
error!("Failed to signal used queue: {:?}", e);
break 'epoll;
}
}
}
KILL_EVENT => {
debug!("KILL_EVENT received, stopping epoll loop");
break 'epoll;
}
PAUSE_EVENT => {
// Drain pause event
let _ = self.pause_evt.read();
debug!("PAUSE_EVENT received, pausing virtio-rng epoll loop");
// We loop here to handle spurious park() returns.
// Until we have not resumed, the paused boolean will
// be true.
while paused.load(Ordering::SeqCst) {
thread::park();
}
}
_ => {
error!("Unknown event for virtio-block");
}
}
}
}
Ok(())
}
}
/// Virtio device for exposing entropy to the guest OS through virtio.
pub struct Rng {
id: String,
kill_evt: Option<EventFd>,
pause_evt: Option<EventFd>,
random_file: Option<File>,
avail_features: u64,
acked_features: u64,
queue_evts: Option<Vec<EventFd>>,
interrupt_cb: Option<Arc<dyn VirtioInterrupt>>,
epoll_threads: Option<Vec<thread::JoinHandle<result::Result<(), DeviceError>>>>,
paused: Arc<AtomicBool>,
}
#[derive(Serialize, Deserialize)]
pub struct RngState {
pub avail_features: u64,
pub acked_features: u64,
pub paused: Arc<AtomicBool>,
}
impl Rng {
/// Create a new virtio rng device that gets random data from /dev/urandom.
pub fn new(id: String, path: &str, iommu: bool) -> io::Result<Rng> {
let random_file = File::open(path)?;
let mut avail_features = 1u64 << VIRTIO_F_VERSION_1;
if iommu {
avail_features |= 1u64 << VIRTIO_F_IOMMU_PLATFORM;
}
Ok(Rng {
id,
kill_evt: None,
pause_evt: None,
random_file: Some(random_file),
avail_features,
acked_features: 0u64,
queue_evts: None,
interrupt_cb: None,
epoll_threads: None,
paused: Arc::new(AtomicBool::new(false)),
})
}
fn state(&self) -> RngState {
RngState {
avail_features: self.avail_features,
acked_features: self.acked_features,
paused: self.paused.clone(),
}
}
fn set_state(&mut self, state: &RngState) -> io::Result<()> {
self.avail_features = state.avail_features;
self.acked_features = state.acked_features;
self.paused = state.paused.clone();
Ok(())
}
}
impl Drop for Rng {
fn drop(&mut self) {
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);
}
}
}
impl VirtioDevice for Rng {
fn device_type(&self) -> u32 {
VirtioDeviceType::TYPE_RNG as u32
}
fn queue_max_sizes(&self) -> &[u16] {
QUEUE_SIZES
}
fn features(&self) -> u64 {
self.avail_features
}
fn ack_features(&mut self, value: u64) {
let mut v = value;
// Check if the guest is ACK'ing a feature that we didn't claim to have.
let unrequested_features = v & !self.avail_features;
if unrequested_features != 0 {
warn!("Received acknowledge request for unknown feature.");
// Don't count these features as acked.
v &= !unrequested_features;
}
self.acked_features |= v;
}
fn read_config(&self, _offset: u64, _data: &mut [u8]) {
warn!("No currently device specific configration defined");
}
fn write_config(&mut self, _offset: u64, _data: &[u8]) {
warn!("No currently device specific configration defined");
}
fn activate(
&mut self,
mem: GuestMemoryAtomic<GuestMemoryMmap>,
interrupt_cb: Arc<dyn VirtioInterrupt>,
queues: Vec<Queue>,
mut queue_evts: Vec<EventFd>,
) -> ActivateResult {
if queues.len() != NUM_QUEUES || queue_evts.len() != NUM_QUEUES {
error!(
"Cannot perform activate. Expected {} queue(s), got {}",
NUM_QUEUES,
queues.len()
);
return Err(ActivateError::BadActivate);
}
let (self_kill_evt, kill_evt) = EventFd::new(EFD_NONBLOCK)
.and_then(|e| Ok((e.try_clone()?, e)))
.map_err(|e| {
error!("failed creating kill EventFd pair: {}", e);
ActivateError::BadActivate
})?;
self.kill_evt = Some(self_kill_evt);
let (self_pause_evt, pause_evt) = EventFd::new(EFD_NONBLOCK)
.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);
// 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);
if let Some(file) = self.random_file.as_ref() {
let random_file = file.try_clone().map_err(|e| {
error!("failed cloning rng source: {}", e);
ActivateError::BadActivate
})?;
let mut handler = RngEpollHandler {
queues,
mem,
random_file,
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_rng".to_string())
.spawn(move || handler.run(paused))
.map(|thread| epoll_threads.push(thread))
.map_err(|e| {
error!("failed to clone the virtio-rng 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()?;
}
// Then kill it.
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!(Rng);
impl Snapshottable for Rng {
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 rng_snapshot = Snapshot::new(self.id.as_str());
rng_snapshot.add_data_section(SnapshotDataSection {
id: format!("{}-section", self.id),
snapshot,
});
Ok(rng_snapshot)
}
fn restore(&mut self, snapshot: Snapshot) -> std::result::Result<(), MigratableError> {
if let Some(rng_section) = snapshot.snapshot_data.get(&format!("{}-section", self.id)) {
let rng_state = match serde_json::from_slice(&rng_section.snapshot) {
Ok(state) => state,
Err(error) => {
return Err(MigratableError::Restore(anyhow!(
"Could not deserialize RNG {}",
error
)))
}
};
return self.set_state(&rng_state).map_err(|e| {
MigratableError::Restore(anyhow!("Could not restore RNG state {:?}", e))
});
}
Err(MigratableError::Restore(anyhow!(
"Could not find RNG snapshot section"
)))
}
}
impl Transportable for Rng {}
impl Migratable for Rng {}