qemu: Log additional data from hyperv crash notifier

The hyperv panic notifier reports additional data in form of 5 registers
that are reported in the crash event from qemu. Log them into the VM log
file and report them as a warning so that admins can see the cause of
crash of their windows VMs.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1426176

src/qemu/qemu_driver.c

@@ -3971,10 +3971,28 @@ doCoreDumpToAutoDumpPath(virQEMUDriverPtr driver,
     return ret;
 }
 
+
+static void
+qemuProcessGuestPanicEventInfo(virQEMUDriverPtr driver,
+                               virDomainObjPtr vm,
+                               qemuMonitorEventPanicInfoPtr info)
+{
+    char *msg = qemuMonitorGuestPanicEventInfoFormatMsg(info);
+    char *timestamp = virTimeStringNow();
+
+    if (msg && timestamp)
+        qemuDomainLogAppendMessage(driver, vm, "%s: panic %s\n", timestamp, msg);
+
+    VIR_FREE(timestamp);
+    VIR_FREE(msg);
+}
+
+
 static void
 processGuestPanicEvent(virQEMUDriverPtr driver,
                        virDomainObjPtr vm,
-                       int action)
+                       int action,
+                       qemuMonitorEventPanicInfoPtr info)
 {
     qemuDomainObjPrivatePtr priv = vm->privateData;
     virObjectEventPtr event = NULL;
@@ -3990,6 +4008,9 @@ processGuestPanicEvent(virQEMUDriverPtr driver,
         goto endjob;
     }
 
+    if (info)
+        qemuProcessGuestPanicEventInfo(driver, vm, info);
+
     virDomainObjSetState(vm, VIR_DOMAIN_CRASHED, VIR_DOMAIN_CRASHED_PANICKED);
 
     event = virDomainEventLifecycleNewFromObj(vm,
@@ -4567,7 +4588,8 @@ static void qemuProcessEventHandler(void *data, void *opaque)
         processWatchdogEvent(driver, vm, processEvent->action);
         break;
     case QEMU_PROCESS_EVENT_GUESTPANIC:
-        processGuestPanicEvent(driver, vm, processEvent->action);
+        processGuestPanicEvent(driver, vm, processEvent->action,
+                               processEvent->data);
         break;
     case QEMU_PROCESS_EVENT_DEVICE_DELETED:
         processDeviceDeletedEvent(driver, vm, processEvent->data);

src/qemu/qemu_monitor.c

@@ -4243,6 +4243,30 @@ qemuMonitorQueryNamedBlockNodes(qemuMonitorPtr mon)
 }
 
 
+char *
+qemuMonitorGuestPanicEventInfoFormatMsg(qemuMonitorEventPanicInfoPtr info)
+{
+    char *ret = NULL;
+
+    switch (info->type) {
+    case QEMU_MONITOR_EVENT_PANIC_INFO_TYPE_HYPERV:
+        ignore_value(virAsprintf(&ret,
+                                 "hyper-v: arg1='0x%llx', arg2='0x%llx', "
+                                 "arg3='0x%llx', arg4='0x%llx', arg5='0x%llx'",
+                                 info->data.hyperv.arg1, info->data.hyperv.arg2,
+                                 info->data.hyperv.arg3, info->data.hyperv.arg4,
+                                 info->data.hyperv.arg5));
+        break;
+
+    case QEMU_MONITOR_EVENT_PANIC_INFO_TYPE_NONE:
+    case QEMU_MONITOR_EVENT_PANIC_INFO_TYPE_LAST:
+        break;
+    }
+
+    return ret;
+}
+
+
 void
 qemuMonitorEventPanicInfoFree(qemuMonitorEventPanicInfoPtr info)
 {

src/qemu/qemu_monitor.h

@@ -97,6 +97,7 @@ struct _qemuMonitorEventPanicInfo {
     } data;
 };
 
+char *qemuMonitorGuestPanicEventInfoFormatMsg(qemuMonitorEventPanicInfoPtr info);
 void qemuMonitorEventPanicInfoFree(qemuMonitorEventPanicInfoPtr info);
 
 typedef void (*qemuMonitorDestroyCallback)(qemuMonitorPtr mon,