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virtio-devices: vhost-user-fs: 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 committed by Sebastien Boeuf
parent 1e4b612d39
commit d33a1a5313
1 changed files with 42 additions and 64 deletions
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106
virtio-devices/src/vhost_user/fs.rs
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@ -9,12 +9,11 @@ use crate::{
ActivateError, ActivateResult, Queue, UserspaceMapping, VirtioCommon, VirtioDevice,
VirtioDeviceType, VirtioInterrupt, VirtioSharedMemoryList, VIRTIO_F_VERSION_1,
};
use libc::{self, c_void, off64_t, pread64, pwrite64, EFD_NONBLOCK};
use libc::{self, c_void, off64_t, pread64, pwrite64};
use seccomp::{SeccompAction, SeccompFilter};
use std::io;
use std::os::unix::io::{AsRawFd, RawFd};
use std::result;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::{Arc, Barrier, Mutex};
use std::thread;
use vhost_rs::vhost_user::message::{
@ -269,19 +268,11 @@ pub struct Fs {
common: VirtioCommon,
id: String,
vu: Master,
queue_sizes: Vec<u16>,
config: VirtioFsConfig,
kill_evt: Option<EventFd>,
pause_evt: Option<EventFd>,
// Hold ownership of the memory that is allocated for the device
// which will be automatically dropped when the device is dropped
cache: Option<(VirtioSharedMemoryList, MmapRegion)>,
slave_req_support: bool,
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,
}
@ -356,23 +347,18 @@ impl Fs {
Ok(Fs {
common: VirtioCommon {
device_type: VirtioDeviceType::TYPE_FS as u32,
avail_features,
acked_features,
queue_sizes: vec![queue_size; num_queues],
paused_sync: Some(Arc::new(Barrier::new(2))),
..Default::default()
},
id,
vu: master,
queue_sizes: vec![queue_size; num_queues],
config,
kill_evt: None,
pause_evt: None,
cache,
slave_req_support,
queue_evts: None,
interrupt_cb: None,
epoll_threads: None,
paused: Arc::new(AtomicBool::new(false)),
paused_sync: Arc::new(Barrier::new(2)),
seccomp_action,
})
}
@ -380,7 +366,7 @@ impl Fs {
impl Drop for Fs {
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);
}
@ -389,11 +375,11 @@ impl Drop for Fs {
impl VirtioDevice for Fs {
fn device_type(&self) -> u32 {
VirtioDeviceType::TYPE_FS as u32
self.common.device_type
}
fn queue_max_sizes(&self) -> &[u16] {
&self.queue_sizes.as_slice()
&self.common.queue_sizes
}
fn features(&self) -> u64 {
@ -415,45 +401,28 @@ impl VirtioDevice for Fs {
queues: Vec<Queue>,
queue_evts: Vec<EventFd>,
) -> ActivateResult {
if queues.len() != self.queue_sizes.len() || queue_evts.len() != self.queue_sizes.len() {
error!(
"Cannot perform activate. Expected {} queue(s), got {}",
self.queue_sizes.len(),
queues.len()
);
return Err(ActivateError::BadActivate);
}
self.common.activate(&queues, &queue_evts, &interrupt_cb)?;
let (self_kill_evt, kill_evt) = EventFd::new(EFD_NONBLOCK)
.and_then(|e| Ok((e.try_clone()?, e)))
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);
// 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);
let vu_call_evt_queue_list = setup_vhost_user(
&mut self.vu,
@ -499,8 +468,8 @@ impl VirtioDevice for Fs {
slave_req_handler,
});
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_vhost_fs_seccomp_filter =
get_seccomp_filter(&self.seccomp_action, Thread::VirtioVhostFs)
@ -510,7 +479,7 @@ impl VirtioDevice for Fs {
.spawn(move || {
if let Err(e) = SeccompFilter::apply(virtio_vhost_fs_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);
}
})
@ -520,31 +489,31 @@ impl VirtioDevice for Fs {
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 self.common.pause_evt.take().is_some() {
self.common.resume().ok()?;
}
if let Err(e) = reset_vhost_user(&mut self.vu, self.queue_sizes.len()) {
if let Err(e) = reset_vhost_user(&mut self.vu, self.common.queue_sizes.len()) {
error!("Failed to reset vhost-user daemon: {:?}", e);
return None;
}
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);
}
// Return the interrupt and queue EventFDs
Some((
self.interrupt_cb.take().unwrap(),
self.queue_evts.take().unwrap(),
self.common.interrupt_cb.take().unwrap(),
self.common.queue_evts.take().unwrap(),
))
}
@ -592,7 +561,16 @@ impl VirtioDevice for Fs {
}
}
virtio_pausable!(Fs);
impl Pausable for Fs {
fn pause(&mut self) -> result::Result<(), MigratableError> {
self.common.pause()
}
fn resume(&mut self) -> result::Result<(), MigratableError> {
self.common.resume()
}
}
impl Snapshottable for Fs {
fn id(&self) -> String {
self.id.clone()