qemu: Fix reboot with guest agent

When reboot using qemu guest agent was requested, qemu driver kept
waiting for SHUTDOWN event from qemu. However, such event is never
emitted during guest reboot and qemu driver would keep waiting forever.

src/qemu/qemu_agent.c

@@ -1294,7 +1294,10 @@ int qemuAgentShutdown(qemuAgentPtr mon,
     if (!cmd)
         return -1;
 
-    mon->await_event = QEMU_AGENT_EVENT_SHUTDOWN;
+    if (mode == QEMU_AGENT_SHUTDOWN_REBOOT)
+        mon->await_event = QEMU_AGENT_EVENT_RESET;
+    else
+        mon->await_event = QEMU_AGENT_EVENT_SHUTDOWN;
     ret = qemuAgentCommand(mon, cmd, &reply,
                            VIR_DOMAIN_QEMU_AGENT_COMMAND_BLOCK);
 

src/qemu/qemu_agent.h

@@ -55,7 +55,8 @@ void qemuAgentClose(qemuAgentPtr mon);
 typedef enum {
     QEMU_AGENT_EVENT_NONE = 0,
     QEMU_AGENT_EVENT_SHUTDOWN,
-    QEMU_AGENT_EVENT_SUSPEND
+    QEMU_AGENT_EVENT_SUSPEND,
+    QEMU_AGENT_EVENT_RESET,
 } qemuAgentEvent;
 
 void qemuAgentNotifyEvent(qemuAgentPtr mon,

src/qemu/qemu_process.c

@@ -511,9 +511,15 @@ qemuProcessHandleReset(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
 {
     struct qemud_driver *driver = qemu_driver;
     virDomainEventPtr event;
+    qemuDomainObjPrivatePtr priv;
 
     virDomainObjLock(vm);
+
     event = virDomainEventRebootNewFromObj(vm);
+    priv = vm->privateData;
+    if (priv->agent)
+        qemuAgentNotifyEvent(priv->agent, QEMU_AGENT_EVENT_RESET);
+
     virDomainObjUnlock(vm);
 
     if (event) {