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vmm: fix missed API or debug events
Previously, we were assuming that every time an eventfd notified us, there was only a single event waiting for us. This meant that if, while one API request was being processed, two more arrived, the second one would not be processed (until the next one arrived, when it would be processed instead of that event, and so on). To fix this, make sure we're processing the number of API and debug requests we've been told have arrived, rather than just one. This is easy to demonstrate by sending lots of API events and adding some sleeps to make sure multiple events can arrive while each is being processed. For other uses of eventfd, like the exit event, this doesn't matter — even if we've received multiple exit events in quick succession, we only need to exit once. So I've only made this change where receiving an event is non-idempotent, i.e. where it matters that we process the event the right number of times. Technically, reset requests are also non-idempotent — there's an observable difference between a VM resetting once, and a VM resetting once and then immediately resetting again. But I've left that alone for now because two resets in immediate succession doesn't sound like something anyone would ever want to me. Signed-off-by: Alyssa Ross <hi@alyssa.is>
This commit is contained in:
Alyssa Ross
Rob Bradford
parent
4a1eab11b4
commit
a455917db5
446
vmm/src/lib.rs
446
vmm/src/lib.rs
@ -1685,252 +1685,254 @@ impl Vmm {
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}
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}
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EpollDispatch::Api => {
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// Consume the event.
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self.api_evt.read().map_err(Error::EventFdRead)?;
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// Consume the events.
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for _ in 0..self.api_evt.read().map_err(Error::EventFdRead)? {
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// Read from the API receiver channel
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let api_request = api_receiver.recv().map_err(Error::ApiRequestRecv)?;
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// Read from the API receiver channel
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let api_request = api_receiver.recv().map_err(Error::ApiRequestRecv)?;
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info!("API request event: {:?}", api_request);
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match api_request {
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ApiRequest::VmCreate(config, sender) => {
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let response = self
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.vm_create(config)
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.map_err(ApiError::VmCreate)
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.map(|_| ApiResponsePayload::Empty);
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info!("API request event: {:?}", api_request);
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match api_request {
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ApiRequest::VmCreate(config, sender) => {
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let response = self
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.vm_create(config)
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.map_err(ApiError::VmCreate)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmDelete(sender) => {
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let response = self
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.vm_delete()
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.map_err(ApiError::VmDelete)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmDelete(sender) => {
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let response = self
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.vm_delete()
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.map_err(ApiError::VmDelete)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmBoot(sender) => {
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let response = self
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.vm_boot()
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.map_err(ApiError::VmBoot)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmBoot(sender) => {
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let response = self
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.vm_boot()
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.map_err(ApiError::VmBoot)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmShutdown(sender) => {
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let response = self
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.vm_shutdown()
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.map_err(ApiError::VmShutdown)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmShutdown(sender) => {
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let response = self
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.vm_shutdown()
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.map_err(ApiError::VmShutdown)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmReboot(sender) => {
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let response = self
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.vm_reboot()
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.map_err(ApiError::VmReboot)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmReboot(sender) => {
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let response = self
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.vm_reboot()
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.map_err(ApiError::VmReboot)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmInfo(sender) => {
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let response = self
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.vm_info()
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.map_err(ApiError::VmInfo)
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.map(ApiResponsePayload::VmInfo);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmInfo(sender) => {
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let response = self
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.vm_info()
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.map_err(ApiError::VmInfo)
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.map(ApiResponsePayload::VmInfo);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmmPing(sender) => {
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let response = ApiResponsePayload::VmmPing(self.vmm_ping());
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmmPing(sender) => {
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let response = ApiResponsePayload::VmmPing(self.vmm_ping());
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sender.send(Ok(response)).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmPause(sender) => {
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let response = self
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.vm_pause()
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.map_err(ApiError::VmPause)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(Ok(response)).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmPause(sender) => {
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let response = self
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.vm_pause()
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.map_err(ApiError::VmPause)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmResume(sender) => {
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let response = self
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.vm_resume()
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.map_err(ApiError::VmResume)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmResume(sender) => {
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let response = self
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.vm_resume()
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.map_err(ApiError::VmResume)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmSnapshot(snapshot_data, sender) => {
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let response = self
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.vm_snapshot(&snapshot_data.destination_url)
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.map_err(ApiError::VmSnapshot)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmSnapshot(snapshot_data, sender) => {
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let response = self
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.vm_snapshot(&snapshot_data.destination_url)
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.map_err(ApiError::VmSnapshot)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmRestore(restore_data, sender) => {
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let response = self
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.vm_restore(restore_data.as_ref().clone())
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.map_err(ApiError::VmRestore)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmRestore(restore_data, sender) => {
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let response = self
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.vm_restore(restore_data.as_ref().clone())
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.map_err(ApiError::VmRestore)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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#[cfg(feature = "guest_debug")]
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ApiRequest::VmCoredump(coredump_data, sender) => {
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let response = self
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.vm_coredump(&coredump_data.destination_url)
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.map_err(ApiError::VmCoredump)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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#[cfg(feature = "guest_debug")]
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ApiRequest::VmCoredump(coredump_data, sender) => {
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let response = self
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.vm_coredump(&coredump_data.destination_url)
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.map_err(ApiError::VmCoredump)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmmShutdown(sender) => {
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let response = self
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.vmm_shutdown()
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.map_err(ApiError::VmmShutdown)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmmShutdown(sender) => {
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let response = self
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.vmm_shutdown()
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.map_err(ApiError::VmmShutdown)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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sender.send(response).map_err(Error::ApiResponseSend)?;
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break 'outer;
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}
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ApiRequest::VmResize(resize_data, sender) => {
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let response = self
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.vm_resize(
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resize_data.desired_vcpus,
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resize_data.desired_ram,
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resize_data.desired_balloon,
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)
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.map_err(ApiError::VmResize)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmResizeZone(resize_zone_data, sender) => {
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let response = self
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.vm_resize_zone(
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resize_zone_data.id.clone(),
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resize_zone_data.desired_ram,
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)
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.map_err(ApiError::VmResizeZone)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddDevice(add_device_data, sender) => {
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let response = self
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.vm_add_device(add_device_data.as_ref().clone())
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.map_err(ApiError::VmAddDevice)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddUserDevice(add_device_data, sender) => {
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let response = self
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.vm_add_user_device(add_device_data.as_ref().clone())
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.map_err(ApiError::VmAddUserDevice)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmRemoveDevice(remove_device_data, sender) => {
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let response = self
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.vm_remove_device(remove_device_data.id.clone())
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.map_err(ApiError::VmRemoveDevice)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddDisk(add_disk_data, sender) => {
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let response = self
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.vm_add_disk(add_disk_data.as_ref().clone())
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.map_err(ApiError::VmAddDisk)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddFs(add_fs_data, sender) => {
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let response = self
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.vm_add_fs(add_fs_data.as_ref().clone())
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.map_err(ApiError::VmAddFs)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddPmem(add_pmem_data, sender) => {
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let response = self
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.vm_add_pmem(add_pmem_data.as_ref().clone())
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.map_err(ApiError::VmAddPmem)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddNet(add_net_data, sender) => {
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let response = self
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.vm_add_net(add_net_data.as_ref().clone())
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.map_err(ApiError::VmAddNet)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddVdpa(add_vdpa_data, sender) => {
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let response = self
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.vm_add_vdpa(add_vdpa_data.as_ref().clone())
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.map_err(ApiError::VmAddVdpa)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddVsock(add_vsock_data, sender) => {
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let response = self
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.vm_add_vsock(add_vsock_data.as_ref().clone())
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.map_err(ApiError::VmAddVsock)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmCounters(sender) => {
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let response = self
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.vm_counters()
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.map_err(ApiError::VmInfo)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmReceiveMigration(receive_migration_data, sender) => {
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let response = self
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.vm_receive_migration(
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receive_migration_data.as_ref().clone(),
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)
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.map_err(ApiError::VmReceiveMigration)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmSendMigration(send_migration_data, sender) => {
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let response = self
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.vm_send_migration(send_migration_data.as_ref().clone())
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.map_err(ApiError::VmSendMigration)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmPowerButton(sender) => {
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let response = self
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.vm_power_button()
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.map_err(ApiError::VmPowerButton)
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.map(|_| ApiResponsePayload::Empty);
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break 'outer;
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}
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ApiRequest::VmResize(resize_data, sender) => {
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let response = self
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.vm_resize(
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resize_data.desired_vcpus,
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resize_data.desired_ram,
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resize_data.desired_balloon,
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)
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.map_err(ApiError::VmResize)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmResizeZone(resize_zone_data, sender) => {
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let response = self
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.vm_resize_zone(
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resize_zone_data.id.clone(),
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resize_zone_data.desired_ram,
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)
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.map_err(ApiError::VmResizeZone)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddDevice(add_device_data, sender) => {
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let response = self
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.vm_add_device(add_device_data.as_ref().clone())
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.map_err(ApiError::VmAddDevice)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddUserDevice(add_device_data, sender) => {
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let response = self
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.vm_add_user_device(add_device_data.as_ref().clone())
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.map_err(ApiError::VmAddUserDevice)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmRemoveDevice(remove_device_data, sender) => {
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let response = self
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.vm_remove_device(remove_device_data.id.clone())
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.map_err(ApiError::VmRemoveDevice)
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.map(|_| ApiResponsePayload::Empty);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddDisk(add_disk_data, sender) => {
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let response = self
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.vm_add_disk(add_disk_data.as_ref().clone())
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.map_err(ApiError::VmAddDisk)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddFs(add_fs_data, sender) => {
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let response = self
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.vm_add_fs(add_fs_data.as_ref().clone())
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.map_err(ApiError::VmAddFs)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddPmem(add_pmem_data, sender) => {
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let response = self
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.vm_add_pmem(add_pmem_data.as_ref().clone())
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.map_err(ApiError::VmAddPmem)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddNet(add_net_data, sender) => {
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let response = self
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.vm_add_net(add_net_data.as_ref().clone())
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.map_err(ApiError::VmAddNet)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddVdpa(add_vdpa_data, sender) => {
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let response = self
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.vm_add_vdpa(add_vdpa_data.as_ref().clone())
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.map_err(ApiError::VmAddVdpa)
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.map(ApiResponsePayload::VmAction);
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sender.send(response).map_err(Error::ApiResponseSend)?;
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}
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ApiRequest::VmAddVsock(add_vsock_data, sender) => {
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let response = self
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.vm_add_vsock(add_vsock_data.as_ref().clone())
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.map_err(ApiError::VmAddVsock)
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.map(ApiResponsePayload::VmAction);
|
||||
sender.send(response).map_err(Error::ApiResponseSend)?;
|
||||
}
|
||||
ApiRequest::VmCounters(sender) => {
|
||||
let response = self
|
||||
.vm_counters()
|
||||
.map_err(ApiError::VmInfo)
|
||||
.map(ApiResponsePayload::VmAction);
|
||||
sender.send(response).map_err(Error::ApiResponseSend)?;
|
||||
}
|
||||
ApiRequest::VmReceiveMigration(receive_migration_data, sender) => {
|
||||
let response = self
|
||||
.vm_receive_migration(receive_migration_data.as_ref().clone())
|
||||
.map_err(ApiError::VmReceiveMigration)
|
||||
.map(|_| ApiResponsePayload::Empty);
|
||||
sender.send(response).map_err(Error::ApiResponseSend)?;
|
||||
}
|
||||
ApiRequest::VmSendMigration(send_migration_data, sender) => {
|
||||
let response = self
|
||||
.vm_send_migration(send_migration_data.as_ref().clone())
|
||||
.map_err(ApiError::VmSendMigration)
|
||||
.map(|_| ApiResponsePayload::Empty);
|
||||
sender.send(response).map_err(Error::ApiResponseSend)?;
|
||||
}
|
||||
ApiRequest::VmPowerButton(sender) => {
|
||||
let response = self
|
||||
.vm_power_button()
|
||||
.map_err(ApiError::VmPowerButton)
|
||||
.map(|_| ApiResponsePayload::Empty);
|
||||
|
||||
sender.send(response).map_err(Error::ApiResponseSend)?;
|
||||
sender.send(response).map_err(Error::ApiResponseSend)?;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
#[cfg(feature = "gdb")]
|
||||
EpollDispatch::Debug => {
|
||||
// Consume the event.
|
||||
self.debug_evt.read().map_err(Error::EventFdRead)?;
|
||||
// Consume the events.
|
||||
for _ in 0..self.debug_evt.read().map_err(Error::EventFdRead)? {
|
||||
// Read from the API receiver channel
|
||||
let gdb_request = gdb_receiver.recv().map_err(Error::GdbRequestRecv)?;
|
||||
|
||||
// Read from the API receiver channel
|
||||
let gdb_request = gdb_receiver.recv().map_err(Error::GdbRequestRecv)?;
|
||||
let response = if let Some(ref mut vm) = self.vm {
|
||||
vm.debug_request(&gdb_request.payload, gdb_request.cpu_id)
|
||||
} else {
|
||||
Err(VmError::VmNotRunning)
|
||||
}
|
||||
.map_err(gdb::Error::Vm);
|
||||
|
||||
let response = if let Some(ref mut vm) = self.vm {
|
||||
vm.debug_request(&gdb_request.payload, gdb_request.cpu_id)
|
||||
} else {
|
||||
Err(VmError::VmNotRunning)
|
||||
gdb_request
|
||||
.sender
|
||||
.send(response)
|
||||
.map_err(Error::GdbResponseSend)?;
|
||||
}
|
||||
.map_err(gdb::Error::Vm);
|
||||
|
||||
gdb_request
|
||||
.sender
|
||||
.send(response)
|
||||
.map_err(Error::GdbResponseSend)?;
|
||||
}
|
||||
#[cfg(not(feature = "gdb"))]
|
||||
EpollDispatch::Debug => {}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user