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Introduce a new event emitted when a virtualization failure occurs

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This introduces a new domain

  VIR_DOMAIN_EVENT_ID_CONTROL_ERROR

Which uses the existing generic callback

typedef void (*virConnectDomainEventGenericCallback)(virConnectPtr conn,
                                                     virDomainPtr dom,
                                                     void *opaque);

This event is intended to be emitted when there is a failure in
some part of the domain virtualization system. Whether the domain
continues to run/exist after the failure is an implementation
detail specific to the hypervisor.

The idea is that with some types of failure, hypervisors may
prefer to leave the domain running in a "degraded" mode of
operation. For example, if something goes wrong with the QEMU
monitor, it is possible to leave the guest OS running quite
happily. The mgmt app will simply loose the ability todo various
tasks. The mgmt app can then choose how/when to deal with the
failure that occured.
* daemon/remote.c: Dispatch of new event
* examples/domain-events/events-c/event-test.c: Demo catch
  of event
* include/libvirt/libvirt.h.in: Define event ID and callback
* src/conf/domain_event.c, src/conf/domain_event.h: Internal
  event handling
* src/remote/remote_driver.c: Receipt of new event from daemon
* src/remote/remote_protocol.x: Wire protocol for new event
* src/remote_protocol-structs: add new event for checks
This commit is contained in:
Daniel P. Berrange
2011-05-29 20:21:53 +08:00
committed by Daniel Veillard
parent bb6cb66fde
commit a6135ec1e6
10 changed files with 120 additions and 1 deletions
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29
daemon/remote.c
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@@ -379,6 +379,34 @@ static int remoteRelayDomainEventGraphics(virConnectPtr conn ATTRIBUTE_UNUSED,
}
static int remoteRelayDomainEventControlError(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
void *opaque)
{
struct qemud_client *client = opaque;
remote_domain_event_control_error_msg data;
if (!client)
return -1;
VIR_DEBUG("Relaying domain control error %s %d", dom->name, dom->id);
virMutexLock(&client->lock);
/* build return data */
memset(&data, 0, sizeof data);
make_nonnull_domain(&data.dom, dom);
remoteDispatchDomainEventSend(client,
REMOTE_PROC_DOMAIN_EVENT_CONTROL_ERROR,
(xdrproc_t)xdr_remote_domain_event_control_error_msg, &data);
virMutexUnlock(&client->lock);
return 0;
}
static virConnectDomainEventGenericCallback domainEventCallbacks[] = {
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventLifecycle),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventReboot),
@@ -387,6 +415,7 @@ static virConnectDomainEventGenericCallback domainEventCallbacks[] = {
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventIOError),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventGraphics),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventIOErrorReason),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventControlError),
};
verify(ARRAY_CARDINALITY(domainEventCallbacks) == VIR_DOMAIN_EVENT_ID_LAST);