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vm-virtio: Add virtio reset() support to MmioDevice

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All our virtio devices support to be reset, but the virtio-mmio
transport layer was not implemented for it. This patch fixes this
lack of support.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf 2020-05-07 14:52:41 +02:00 committed by Rob Bradford
parent 0d720cc3d8
commit d809f2fe09
1 changed files with 25 additions and 0 deletions
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25
vm-virtio/src/transport/mmio.rs
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@ -206,6 +206,11 @@ impl MmioDevice {
self.driver_status == ready_bits && self.driver_status & DEVICE_FAILED == 0
}
/// Determines if the driver has requested the device (re)init / reset itself
fn is_driver_init(&self) -> bool {
self.driver_status == DEVICE_INIT
}
fn are_queues_valid(&self) -> bool {
if let Some(mem) = self.mem.as_ref() {
self.queues.iter().all(|q| q.is_valid(&mem.memory()))
@ -412,6 +417,26 @@ impl BusDevice for MmioDevice {
}
}
}
// Device has been reset by the driver
if self.device_activated && self.is_driver_init() {
let mut device = self.device.lock().unwrap();
if let Some((interrupt_cb, mut queue_evts)) = device.reset() {
// Upon reset the device returns its interrupt EventFD and it's queue EventFDs
self.interrupt_cb = Some(interrupt_cb);
self.queue_evts.append(&mut queue_evts);
self.device_activated = false;
// Reset queue readiness (changes queue_enable), queue sizes
// and selected_queue as per spec for reset
self.queues.iter_mut().for_each(Queue::reset);
self.queue_select = 0;
} else {
error!("Attempt to reset device when not implemented in underlying device");
self.driver_status = DEVICE_FAILED;
}
}
}
}