qemu: Handle 'postcopy-paused' migration state

When connection breaks during post-copy migration, QEMU enters
'postcopy-paused' state. We need to handle this state and make the
situation visible to upper layers.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>

src/hypervisor/domain_job.c

@@ -93,6 +93,7 @@ virDomainJobStatusToType(virDomainJobStatus status)
     case VIR_DOMAIN_JOB_STATUS_MIGRATING:
     case VIR_DOMAIN_JOB_STATUS_HYPERVISOR_COMPLETED:
     case VIR_DOMAIN_JOB_STATUS_POSTCOPY:
+    case VIR_DOMAIN_JOB_STATUS_POSTCOPY_PAUSED:
     case VIR_DOMAIN_JOB_STATUS_PAUSED:
         return VIR_DOMAIN_JOB_UNBOUNDED;
 

src/hypervisor/domain_job.h

@@ -78,6 +78,7 @@ typedef enum {
     VIR_DOMAIN_JOB_STATUS_HYPERVISOR_COMPLETED,
     VIR_DOMAIN_JOB_STATUS_PAUSED,
     VIR_DOMAIN_JOB_STATUS_POSTCOPY,
+    VIR_DOMAIN_JOB_STATUS_POSTCOPY_PAUSED,
     VIR_DOMAIN_JOB_STATUS_COMPLETED,
     VIR_DOMAIN_JOB_STATUS_FAILED,
     VIR_DOMAIN_JOB_STATUS_CANCELED,

src/qemu/qemu_driver.c

@@ -12545,6 +12545,7 @@ qemuDomainGetJobInfoMigrationStats(virQEMUDriver *driver,
     case VIR_DOMAIN_JOB_STATUS_HYPERVISOR_COMPLETED:
     case VIR_DOMAIN_JOB_STATUS_POSTCOPY:
     case VIR_DOMAIN_JOB_STATUS_PAUSED:
+    case VIR_DOMAIN_JOB_STATUS_POSTCOPY_PAUSED:
         if (qemuMigrationAnyFetchStats(driver, vm, VIR_ASYNC_JOB_NONE,
                                        jobData, NULL) < 0)
             return -1;

src/qemu/qemu_migration.c

@@ -1747,6 +1747,10 @@ qemuMigrationUpdateJobType(virDomainJobData *jobData)
         jobData->status = VIR_DOMAIN_JOB_STATUS_POSTCOPY;
         break;
 
+    case QEMU_MONITOR_MIGRATION_STATUS_POSTCOPY_PAUSED:
+        jobData->status = VIR_DOMAIN_JOB_STATUS_POSTCOPY_PAUSED;
+        break;
+
     case QEMU_MONITOR_MIGRATION_STATUS_COMPLETED:
         jobData->status = VIR_DOMAIN_JOB_STATUS_HYPERVISOR_COMPLETED;
         break;
@@ -1871,6 +1875,12 @@ qemuMigrationJobCheckStatus(virQEMUDriver *driver,
                        qemuMigrationJobName(vm), _("canceled by client"));
         return -1;
 
+    case VIR_DOMAIN_JOB_STATUS_POSTCOPY_PAUSED:
+        virReportError(VIR_ERR_OPERATION_FAILED, _("%s: %s"),
+                       qemuMigrationJobName(vm),
+                       _("post-copy phase failed"));
+        return -1;
+
     case VIR_DOMAIN_JOB_STATUS_COMPLETED:
     case VIR_DOMAIN_JOB_STATUS_ACTIVE:
     case VIR_DOMAIN_JOB_STATUS_MIGRATING:
@@ -1973,6 +1983,7 @@ qemuMigrationAnyCompleted(virQEMUDriver *driver,
 
     case VIR_DOMAIN_JOB_STATUS_FAILED:
     case VIR_DOMAIN_JOB_STATUS_CANCELED:
+    case VIR_DOMAIN_JOB_STATUS_POSTCOPY_PAUSED:
         /* QEMU aborted the migration. */
         return -1;
 

src/qemu/qemu_monitor.c

@@ -149,6 +149,7 @@ VIR_ENUM_IMPL(qemuMonitorMigrationStatus,
               "inactive", "setup",
               "active", "pre-switchover",
               "device", "postcopy-active",
+              "postcopy-paused",
               "completed", "failed",
               "cancelling", "cancelled",
               "wait-unplug",

src/qemu/qemu_monitor.h

@@ -795,6 +795,7 @@ typedef enum {
     QEMU_MONITOR_MIGRATION_STATUS_PRE_SWITCHOVER,
     QEMU_MONITOR_MIGRATION_STATUS_DEVICE,
     QEMU_MONITOR_MIGRATION_STATUS_POSTCOPY,
+    QEMU_MONITOR_MIGRATION_STATUS_POSTCOPY_PAUSED,
     QEMU_MONITOR_MIGRATION_STATUS_COMPLETED,
     QEMU_MONITOR_MIGRATION_STATUS_ERROR,
     QEMU_MONITOR_MIGRATION_STATUS_CANCELLING,

src/qemu/qemu_monitor_json.c

@@ -3242,6 +3242,7 @@ qemuMonitorJSONGetMigrationStatsReply(virJSONValue *reply,
 
     case QEMU_MONITOR_MIGRATION_STATUS_ACTIVE:
     case QEMU_MONITOR_MIGRATION_STATUS_POSTCOPY:
+    case QEMU_MONITOR_MIGRATION_STATUS_POSTCOPY_PAUSED:
     case QEMU_MONITOR_MIGRATION_STATUS_COMPLETED:
     case QEMU_MONITOR_MIGRATION_STATUS_CANCELLING:
     case QEMU_MONITOR_MIGRATION_STATUS_PRE_SWITCHOVER:

src/qemu/qemu_process.c

@@ -1513,6 +1513,17 @@ qemuProcessHandleMigrationStatus(qemuMonitor *mon G_GNUC_UNUSED,
         }
         break;
 
+    case QEMU_MONITOR_MIGRATION_STATUS_POSTCOPY_PAUSED:
+        if (priv->job.asyncJob == VIR_ASYNC_JOB_MIGRATION_OUT &&
+            state == VIR_DOMAIN_PAUSED) {
+            /* At this point no thread is watching the migration progress on
+             * the source as it is just waiting for the Finish phase to end.
+             * Thus we need to handle the event here. */
+            qemuMigrationSrcPostcopyFailed(vm);
+            qemuDomainSaveStatus(vm);
+        }
+        break;
+
     case QEMU_MONITOR_MIGRATION_STATUS_INACTIVE:
     case QEMU_MONITOR_MIGRATION_STATUS_SETUP:
     case QEMU_MONITOR_MIGRATION_STATUS_ACTIVE: