QMP: Introduce basic asynchronous events

Debug, shutdown, reset, powerdown and stop are all basic events,
as they are very simple they can be added in the same commit.
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

monitor.c

@@ -342,6 +342,21 @@ void monitor_protocol_event(MonitorEvent event, QObject *data)
         return;
 
     switch (event) {
+        case EVENT_DEBUG:
+            event_name = "DEBUG";
+            break;
+        case EVENT_SHUTDOWN:
+            event_name = "SHUTDOWN";
+            break;
+        case EVENT_RESET:
+            event_name = "RESET";
+            break;
+        case EVENT_POWERDOWN:
+            event_name = "POWERDOWN";
+            break;
+        case EVENT_STOP:
+            event_name = "STOP";
+            break;
         default:
             abort();
             break;

monitor.h

@@ -15,6 +15,11 @@ extern Monitor *cur_mon;
 
 /* QMP events */
 typedef enum MonitorEvent {
+    EVENT_DEBUG,
+    EVENT_SHUTDOWN,
+    EVENT_RESET,
+    EVENT_POWERDOWN,
+    EVENT_STOP,
     EVENT_MAX,
 } MonitorEvent;
 

vl.c

@@ -4060,9 +4060,12 @@ static void main_loop(void)
 #endif
         } while (vm_can_run());
 
-        if (qemu_debug_requested())
+        if (qemu_debug_requested()) {
+            monitor_protocol_event(EVENT_DEBUG, NULL);
             vm_stop(EXCP_DEBUG);
+        }
         if (qemu_shutdown_requested()) {
+            monitor_protocol_event(EVENT_SHUTDOWN, NULL);
             if (no_shutdown) {
                 vm_stop(0);
                 no_shutdown = 0;
@@ -4070,15 +4073,19 @@ static void main_loop(void)
                 break;
         }
         if (qemu_reset_requested()) {
+            monitor_protocol_event(EVENT_RESET, NULL);
             pause_all_vcpus();
             qemu_system_reset();
             resume_all_vcpus();
         }
         if (qemu_powerdown_requested()) {
+            monitor_protocol_event(EVENT_POWERDOWN, NULL);
             qemu_irq_raise(qemu_system_powerdown);
         }
-        if ((r = qemu_vmstop_requested()))
+        if ((r = qemu_vmstop_requested())) {
+            monitor_protocol_event(EVENT_STOP, NULL);
             vm_stop(r);
+        }
     }
     pause_all_vcpus();
 }