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virtio-devices: balloon: Port to VirtioCommon

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Use VirtioCommon to handle activate() preparation, reset() and Pausable.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2020-09-04 09:37:37 +01:00
parent 3487524950
commit 3c6fd5634d
1 changed files with 36 additions and 68 deletions
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104
virtio-devices/src/balloon.rs
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@ -311,14 +311,7 @@ pub struct Balloon {
common: VirtioCommon,
id: String,
resize: VirtioBalloonResize,
kill_evt: Option<EventFd>,
pause_evt: Option<EventFd>,
config: Arc<Mutex<VirtioBalloonConfig>>,
queue_evts: Option<Vec<EventFd>>,
interrupt_cb: Option<Arc<dyn VirtioInterrupt>>,
epoll_threads: Option<Vec<thread::JoinHandle<()>>>,
paused: Arc<AtomicBool>,
paused_sync: Arc<Barrier>,
seccomp_action: SeccompAction,
}
@ -332,19 +325,15 @@ impl Balloon {
Ok(Balloon {
common: VirtioCommon {
device_type: VirtioDeviceType::TYPE_BALLOON as u32,
avail_features,
paused_sync: Some(Arc::new(Barrier::new(2))),
queue_sizes: QUEUE_SIZES.to_vec(),
..Default::default()
},
id,
resize: VirtioBalloonResize::new()?,
kill_evt: None,
pause_evt: None,
config: Arc::new(Mutex::new(config)),
queue_evts: None,
interrupt_cb: None,
epoll_threads: None,
paused: Arc::new(AtomicBool::new(false)),
paused_sync: Arc::new(Barrier::new(2)),
seccomp_action,
})
}
@ -356,7 +345,7 @@ impl Balloon {
impl Drop for Balloon {
fn drop(&mut self) {
if let Some(kill_evt) = self.kill_evt.take() {
if let Some(kill_evt) = self.common.kill_evt.take() {
// Ignore the result because there is nothing we can do about it.
let _ = kill_evt.write(1);
}
@ -365,11 +354,11 @@ impl Drop for Balloon {
impl VirtioDevice for Balloon {
fn device_type(&self) -> u32 {
VirtioDeviceType::TYPE_BALLOON as u32
self.common.device_type
}
fn queue_max_sizes(&self) -> &[u16] {
QUEUE_SIZES
&self.common.queue_sizes
}
fn features(&self) -> u64 {
@ -391,43 +380,27 @@ impl VirtioDevice for Balloon {
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)))
self.common.activate(&queues, &queue_evts, &interrupt_cb)?;
let kill_evt = self
.common
.kill_evt
.as_ref()
.unwrap()
.try_clone()
.map_err(|e| {
error!("failed creating kill EventFd pair: {}", e);
error!("failed to clone kill_evt eventfd: {}", 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)))
let pause_evt = self
.common
.pause_evt
.as_ref()
.unwrap()
.try_clone()
.map_err(|e| {
error!("failed creating pause EventFd pair: {}", e);
error!("failed to clone pause_evt eventfd: {}", e);
ActivateError::BadActivate
})?;
self.pause_evt = Some(self_pause_evt);
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);
let mut handler = BalloonEpollHandler {
config: self.config.clone(),
@ -444,8 +417,8 @@ impl VirtioDevice for Balloon {
pause_evt,
};
let paused = self.paused.clone();
let paused_sync = self.paused_sync.clone();
let paused = self.common.paused.clone();
let paused_sync = self.common.paused_sync.clone();
let mut epoll_threads = Vec::new();
let virtio_balloon_seccomp_filter =
get_seccomp_filter(&self.seccomp_action, Thread::VirtioBalloon)
@ -455,7 +428,7 @@ impl VirtioDevice for Balloon {
.spawn(move || {
if let Err(e) = SeccompFilter::apply(virtio_balloon_seccomp_filter) {
error!("Error applying seccomp filter: {:?}", e);
} else if let Err(e) = handler.run(paused, paused_sync) {
} else if let Err(e) = handler.run(paused, paused_sync.unwrap()) {
error!("Error running worker: {:?}", e);
}
})
@ -464,31 +437,26 @@ impl VirtioDevice for Balloon {
error!("failed to clone virtio-balloon epoll thread: {}", e);
ActivateError::BadActivate
})?;
self.epoll_threads = Some(epoll_threads);
self.common.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(),
))
self.common.reset()
}
}
impl Pausable for Balloon {
fn pause(&mut self) -> result::Result<(), MigratableError> {
self.common.pause()
}
fn resume(&mut self) -> result::Result<(), MigratableError> {
self.common.resume()
}
}
virtio_pausable!(Balloon);
impl Snapshottable for Balloon {
fn id(&self) -> String {
self.id.clone()