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virtio-devices, vmm: Enhance debugging around virtio device activation

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Sometimes when running under the CI tests fail due to a barrier not
being released and the guest blocks on an MMIO write. Add further
debugging to try and identify the issue.

See: #2118

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2021-01-07 06:57:17 +00:00
parent a286e960ed
commit e0d79196c8
2 changed files with 12 additions and 2 deletions
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8
virtio-devices/src/transport/pci_device.rs
View File

@ -673,6 +673,8 @@ impl VirtioPciDevice {
info!("{}: Barrier released", self.id);
}
}
} else {
info!("{}: Device does not need activation", self.id)
}
}
@ -1018,8 +1020,12 @@ impl PciDevice for VirtioPciDevice {
// Try and activate the device if the driver status has changed
if self.needs_activation() {
info!("{}: Needs activation; returning barrier", self.id);
info!(
"{}: Needs activation; writing to activate event fd",
self.id
);
self.activate_evt.write(1).ok();
info!("{}: Needs activation; returning barrier", self.id);
return Some(self.activate_barrier.clone());
}

6
vmm/src/lib.rs
View File

@ -1099,10 +1099,14 @@ impl Vmm {
}
EpollDispatch::ActivateVirtioDevices => {
if let Some(ref vm) = self.vm {
let count = self.activate_evt.read().map_err(Error::EventFdRead)?;
info!(
"Trying to activate pending virtio devices: count = {}",
count
);
vm.activate_virtio_devices()
.map_err(Error::ActivateVirtioDevices)?;
}
self.activate_evt.read().map_err(Error::EventFdRead)?;
}
EpollDispatch::Api => {
// Consume the event.