qemu: Add support for DUMP_COMPLETED event

The event will be fired when the domain memory only dump completes.

Fill in a return buffer to store/pass along the dump statistics that
will be eventually shared by a query-dump command. Also pass along
the status of the filling and any possible error received.
Reviewed-by: NJiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_monitor.c

@@ -210,6 +210,10 @@ VIR_ENUM_IMPL(qemuMonitorBlockIOStatus,
               QEMU_MONITOR_BLOCK_IO_STATUS_LAST,
               "ok", "failed", "nospace")
 
+VIR_ENUM_IMPL(qemuMonitorDumpStatus,
+              QEMU_MONITOR_DUMP_STATUS_LAST,
+              "none", "active", "completed", "failed")
+
 char *
 qemuMonitorEscapeArg(const char *in)
 {
@@ -1666,6 +1670,23 @@ qemuMonitorEmitBlockThreshold(qemuMonitorPtr mon,
 }
 
 
+int
+qemuMonitorEmitDumpCompleted(qemuMonitorPtr mon,
+                             int status,
+                             qemuMonitorDumpStatsPtr stats,
+                             const char *error)
+{
+    int ret = -1;
+
+    VIR_DEBUG("mon=%p", mon);
+
+    QEMU_MONITOR_CALLBACK(mon, ret, domainDumpCompleted, mon->vm,
+                          status, stats, error);
+
+    return ret;
+}
+
+
 int
 qemuMonitorSetCapabilities(qemuMonitorPtr mon)
 {

src/qemu/qemu_monitor.h

@@ -266,6 +266,13 @@ struct _qemuMonitorDumpStats {
     unsigned long long total; /* total bytes to be written */
 };
 
+typedef int (*qemuMonitorDomainDumpCompletedCallback)(qemuMonitorPtr mon,
+                                                      virDomainObjPtr vm,
+                                                      int status,
+                                                      qemuMonitorDumpStatsPtr stats,
+                                                      const char *error,
+                                                      void *opaque);
+
 typedef struct _qemuMonitorCallbacks qemuMonitorCallbacks;
 typedef qemuMonitorCallbacks *qemuMonitorCallbacksPtr;
 struct _qemuMonitorCallbacks {
@@ -298,6 +305,7 @@ struct _qemuMonitorCallbacks {
     qemuMonitorDomainMigrationPassCallback domainMigrationPass;
     qemuMonitorDomainAcpiOstInfoCallback domainAcpiOstInfo;
     qemuMonitorDomainBlockThresholdCallback domainBlockThreshold;
+    qemuMonitorDomainDumpCompletedCallback domainDumpCompleted;
 };
 
 char *qemuMonitorEscapeArg(const char *in);
@@ -427,6 +435,11 @@ int qemuMonitorEmitBlockThreshold(qemuMonitorPtr mon,
                                   unsigned long long threshold,
                                   unsigned long long excess);
 
+int qemuMonitorEmitDumpCompleted(qemuMonitorPtr mon,
+                                 int status,
+                                 qemuMonitorDumpStatsPtr stats,
+                                 const char *error);
+
 int qemuMonitorStartCPUs(qemuMonitorPtr mon,
                          virConnectPtr conn);
 int qemuMonitorStopCPUs(qemuMonitorPtr mon);

src/qemu/qemu_monitor_json.c

@@ -90,6 +90,7 @@ static void qemuMonitorJSONHandleMigrationStatus(qemuMonitorPtr mon, virJSONValu
 static void qemuMonitorJSONHandleMigrationPass(qemuMonitorPtr mon, virJSONValuePtr data);
 static void qemuMonitorJSONHandleAcpiOstInfo(qemuMonitorPtr mon, virJSONValuePtr data);
 static void qemuMonitorJSONHandleBlockThreshold(qemuMonitorPtr mon, virJSONValuePtr data);
+static void qemuMonitorJSONHandleDumpCompleted(qemuMonitorPtr mon, virJSONValuePtr data);
 
 typedef struct {
     const char *type;
@@ -106,6 +107,7 @@ static qemuEventHandler eventHandlers[] = {
     { "BLOCK_WRITE_THRESHOLD", qemuMonitorJSONHandleBlockThreshold, },
     { "DEVICE_DELETED", qemuMonitorJSONHandleDeviceDeleted, },
     { "DEVICE_TRAY_MOVED", qemuMonitorJSONHandleTrayChange, },
+    { "DUMP_COMPLETED", qemuMonitorJSONHandleDumpCompleted, },
     { "GUEST_PANICKED", qemuMonitorJSONHandleGuestPanic, },
     { "MIGRATION", qemuMonitorJSONHandleMigrationStatus, },
     { "MIGRATION_PASS", qemuMonitorJSONHandleMigrationPass, },
@@ -1143,6 +1145,64 @@ qemuMonitorJSONHandleBlockThreshold(qemuMonitorPtr mon, virJSONValuePtr data)
 }
 
 
+static int
+qemuMonitorJSONExtractDumpStats(virJSONValuePtr result,
+                                qemuMonitorDumpStatsPtr ret)
+{
+    const char *statusstr;
+
+    if (!(statusstr = virJSONValueObjectGetString(result, "status"))) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("incomplete result, failed to get status"));
+        return -1;
+    }
+
+    ret->status = qemuMonitorDumpStatusTypeFromString(statusstr);
+    if (ret->status < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("incomplete result, unknown status string '%s'"),
+                       statusstr);
+        return -1;
+    }
+
+    if (virJSONValueObjectGetNumberUlong(result, "completed", &ret->completed) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("incomplete result, failed to get completed"));
+        return -1;
+    }
+
+    if (virJSONValueObjectGetNumberUlong(result, "total", &ret->total) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("incomplete result, failed to get total"));
+        return -1;
+    }
+
+    return 0;
+}
+
+
+static void
+qemuMonitorJSONHandleDumpCompleted(qemuMonitorPtr mon,
+                                   virJSONValuePtr data)
+{
+    virJSONValuePtr result;
+    int status;
+    qemuMonitorDumpStats stats = { 0 };
+    const char *error = NULL;
+
+    if (!(result = virJSONValueObjectGetObject(data, "result"))) {
+        VIR_WARN("missing result in dump completed event");
+        return;
+    }
+
+    status = qemuMonitorJSONExtractDumpStats(result, &stats);
+
+    error = virJSONValueObjectGetString(data, "error");
+
+    qemuMonitorEmitDumpCompleted(mon, status, &stats, error);
+}
+
+
 int
 qemuMonitorJSONHumanCommandWithFd(qemuMonitorPtr mon,
                                   const char *cmd_str,