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libxl: Handle domain death events in a thread
Similar to domain shutdown events, processing domain death events can be a lengthy process and we don't want to block the event handler while the operation completes. Move the death handling function to a thread. Signed-off-by: Jim Fehlig <jfehlig@suse.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
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@ -613,12 +613,17 @@ libxlDomainShutdownThread(void *opaque)
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}
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}
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static void
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static void
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libxlDomainHandleDeath(libxlDriverPrivate *driver, virDomainObj *vm)
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libxlDomainDeathThread(void *opaque)
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{
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{
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struct libxlEventHandlerThreadInfo *death_info = opaque;
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virDomainObj *vm = death_info->vm;
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libxl_event *ev = death_info->event;
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libxlDriverPrivate *driver = death_info->driver;
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virObjectEvent *dom_event = NULL;
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virObjectEvent *dom_event = NULL;
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g_autoptr(libxlDriverConfig) cfg = libxlDriverConfigGet(driver);
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if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
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if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0)
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return;
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goto cleanup;
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virDomainObjSetState(vm, VIR_DOMAIN_SHUTOFF, VIR_DOMAIN_SHUTOFF_DESTROYED);
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virDomainObjSetState(vm, VIR_DOMAIN_SHUTOFF, VIR_DOMAIN_SHUTOFF_DESTROYED);
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dom_event = virDomainEventLifecycleNewFromObj(vm,
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dom_event = virDomainEventLifecycleNewFromObj(vm,
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@ -629,6 +634,11 @@ libxlDomainHandleDeath(libxlDriverPrivate *driver, virDomainObj *vm)
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virDomainObjListRemove(driver->domains, vm);
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virDomainObjListRemove(driver->domains, vm);
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libxlDomainObjEndJob(driver, vm);
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libxlDomainObjEndJob(driver, vm);
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virObjectEventStateQueue(driver->domainEventState, dom_event);
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virObjectEventStateQueue(driver->domainEventState, dom_event);
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cleanup:
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virDomainObjEndAPI(&vm);
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libxl_event_free(cfg->ctx, ev);
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VIR_FREE(death_info);
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}
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}
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@ -642,6 +652,9 @@ libxlDomainEventHandler(void *data, libxl_event *event)
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libxl_shutdown_reason xl_reason = event->u.domain_shutdown.shutdown_reason;
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libxl_shutdown_reason xl_reason = event->u.domain_shutdown.shutdown_reason;
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virDomainObj *vm = NULL;
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virDomainObj *vm = NULL;
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g_autoptr(libxlDriverConfig) cfg = NULL;
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g_autoptr(libxlDriverConfig) cfg = NULL;
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struct libxlEventHandlerThreadInfo *thread_info = NULL;
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virThread thread;
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g_autofree char *thread_name = NULL;
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VIR_DEBUG("Received libxl event '%d' for domid '%d'", event->type, event->domid);
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VIR_DEBUG("Received libxl event '%d' for domid '%d'", event->type, event->domid);
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@ -664,31 +677,27 @@ libxlDomainEventHandler(void *data, libxl_event *event)
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goto cleanup;
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goto cleanup;
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}
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}
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/*
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* Start event-specific threads to handle shutdown and death.
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* They are potentially lengthy operations and we don't want to be
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* blocking this event handler while they are in progress.
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*/
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if (event->type == LIBXL_EVENT_TYPE_DOMAIN_SHUTDOWN) {
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if (event->type == LIBXL_EVENT_TYPE_DOMAIN_SHUTDOWN) {
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struct libxlEventHandlerThreadInfo *shutdown_info = NULL;
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thread_info = g_new0(struct libxlEventHandlerThreadInfo, 1);
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virThread thread;
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g_autofree char *name = NULL;
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/*
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thread_info->driver = driver;
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* Start a thread to handle shutdown. We don't want to be tying up
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thread_info->vm = vm;
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* libxl's event machinery by doing a potentially lengthy shutdown.
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thread_info->event = (libxl_event *)event;
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*/
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thread_name = g_strdup_printf("shutdown-event-%d", event->domid);
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shutdown_info = g_new0(struct libxlEventHandlerThreadInfo, 1);
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shutdown_info->driver = driver;
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shutdown_info->vm = vm;
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shutdown_info->event = (libxl_event *)event;
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name = g_strdup_printf("shutdown-event-%d", event->domid);
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/*
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/*
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* Cleanup will be handled by the shutdown thread.
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* Cleanup will be handled by the shutdown thread.
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*/
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*/
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if (virThreadCreateFull(&thread, false, libxlDomainShutdownThread,
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if (virThreadCreateFull(&thread, false, libxlDomainShutdownThread,
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name, false, shutdown_info) < 0) {
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thread_name, false, thread_info) < 0) {
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/*
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/*
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* Not much we can do on error here except log it.
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* Not much we can do on error here except log it.
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*/
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*/
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VIR_ERROR(_("Failed to create thread to handle domain shutdown"));
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VIR_ERROR(_("Failed to create thread to handle domain shutdown"));
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VIR_FREE(shutdown_info);
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goto cleanup;
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goto cleanup;
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}
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}
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/*
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/*
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@ -697,15 +706,33 @@ libxlDomainEventHandler(void *data, libxl_event *event)
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*/
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*/
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return;
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return;
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} else if (event->type == LIBXL_EVENT_TYPE_DOMAIN_DEATH) {
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} else if (event->type == LIBXL_EVENT_TYPE_DOMAIN_DEATH) {
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thread_info = g_new0(struct libxlEventHandlerThreadInfo, 1);
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thread_info->driver = driver;
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thread_info->vm = vm;
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thread_info->event = (libxl_event *)event;
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thread_name = g_strdup_printf("death-event-%d", event->domid);
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/*
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/*
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* On death the domain is cleaned up from Xen's perspective.
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* Cleanup will be handled by the death thread.
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* Cleanup on the libvirt side can be done synchronously.
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*/
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*/
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libxlDomainHandleDeath(driver, vm);
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if (virThreadCreateFull(&thread, false, libxlDomainDeathThread,
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thread_name, false, thread_info) < 0) {
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/*
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* Not much we can do on error here except log it.
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*/
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VIR_ERROR(_("Failed to create thread to handle domain death"));
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goto cleanup;
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}
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/*
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* virDomainObjEndAPI is called in the death thread, where
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* libxlEventHandlerThreadInfo and libxl_event are also freed.
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*/
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return;
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}
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}
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cleanup:
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cleanup:
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virDomainObjEndAPI(&vm);
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virDomainObjEndAPI(&vm);
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VIR_FREE(thread_info);
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cfg = libxlDriverConfigGet(driver);
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cfg = libxlDriverConfigGet(driver);
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/* Cast away any const */
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/* Cast away any const */
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libxl_event_free(cfg->ctx, (libxl_event *)event);
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libxl_event_free(cfg->ctx, (libxl_event *)event);
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