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vm-virtio: Add virtio reset() support to MmioDevice
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>
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@ -206,6 +206,11 @@ impl MmioDevice {
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self.driver_status == ready_bits && self.driver_status & DEVICE_FAILED == 0
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self.driver_status == ready_bits && self.driver_status & DEVICE_FAILED == 0
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}
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}
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/// Determines if the driver has requested the device (re)init / reset itself
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fn is_driver_init(&self) -> bool {
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self.driver_status == DEVICE_INIT
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}
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fn are_queues_valid(&self) -> bool {
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fn are_queues_valid(&self) -> bool {
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if let Some(mem) = self.mem.as_ref() {
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if let Some(mem) = self.mem.as_ref() {
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self.queues.iter().all(|q| q.is_valid(&mem.memory()))
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self.queues.iter().all(|q| q.is_valid(&mem.memory()))
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@ -412,6 +417,26 @@ impl BusDevice for MmioDevice {
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}
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}
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}
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}
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}
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}
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// Device has been reset by the driver
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if self.device_activated && self.is_driver_init() {
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let mut device = self.device.lock().unwrap();
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if let Some((interrupt_cb, mut queue_evts)) = device.reset() {
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// Upon reset the device returns its interrupt EventFD and it's queue EventFDs
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self.interrupt_cb = Some(interrupt_cb);
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self.queue_evts.append(&mut queue_evts);
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self.device_activated = false;
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// Reset queue readiness (changes queue_enable), queue sizes
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// and selected_queue as per spec for reset
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self.queues.iter_mut().for_each(Queue::reset);
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self.queue_select = 0;
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} else {
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error!("Attempt to reset device when not implemented in underlying device");
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self.driver_status = DEVICE_FAILED;
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}
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}
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}
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}
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}
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}
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