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vm-virtio: Modify VirtioInterrupt callback into a trait

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Callbacks are not the most Rust idiomatic way of programming. The right
way is to use a Trait to provide multiple implementation of the same
interface.

Additionally, a Trait will allow for multiple functions to be defined
while using callbacks means that a new callback must be introduced for
each new function we want to add.

For these two reasons, the current commit modifies the existing
VirtioInterrupt callback into a Trait of the same name.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2020-01-13 18:52:19 +01:00
committed by Samuel Ortiz
parent ef7d889a79
commit c396baca46
18 changed files with 221 additions and 223 deletions
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18
vm-virtio/src/rng.rs
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@@ -38,7 +38,7 @@ struct RngEpollHandler {
queues: Vec<Queue>,
mem: Arc<ArcSwap<GuestMemoryMmap>>,
random_file: File,
interrupt_cb: Arc<VirtioInterrupt>,
interrupt_cb: Arc<dyn VirtioInterrupt>,
queue_evt: EventFd,
kill_evt: EventFd,
pause_evt: EventFd,
@@ -80,10 +80,12 @@ impl RngEpollHandler {
}
fn signal_used_queue(&self) -> result::Result<(), DeviceError> {
(self.interrupt_cb)(&VirtioInterruptType::Queue, Some(&self.queues[0])).map_err(|e| {
error!("Failed to signal used queue: {:?}", e);
DeviceError::FailedSignalingUsedQueue(e)
})
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> {
@@ -181,7 +183,7 @@ pub struct Rng {
avail_features: u64,
acked_features: u64,
queue_evts: Option<Vec<EventFd>>,
interrupt_cb: Option<Arc<VirtioInterrupt>>,
interrupt_cb: Option<Arc<dyn VirtioInterrupt>>,
epoll_thread: Option<thread::JoinHandle<result::Result<(), DeviceError>>>,
paused: Arc<AtomicBool>,
}
@@ -273,7 +275,7 @@ impl VirtioDevice for Rng {
fn activate(
&mut self,
mem: Arc<ArcSwap<GuestMemoryMmap>>,
interrupt_cb: Arc<VirtioInterrupt>,
interrupt_cb: Arc<dyn VirtioInterrupt>,
queues: Vec<Queue>,
mut queue_evts: Vec<EventFd>,
) -> ActivateResult {
@@ -347,7 +349,7 @@ impl VirtioDevice for Rng {
Err(ActivateError::BadActivate)
}
fn reset(&mut self) -> Option<(Arc<VirtioInterrupt>, Vec<EventFd>)> {
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()?;