qemu: Kill QEMU process if Prepare phase fails

Some failure paths in qemuMigrationPrepareAny forgot to kill the just
started QEMU process. This patch fixes this by combining 'stop' and
'endjob' label into a new label 'stopjob'. This name was chosen to avoid
confusion with the most common semantics of 'endjob'. Normally, 'endjob'
is always called at the end of an API to stop the job we entered at the
beginning. In qemuMigrationPrepareAny we only want to stop the job in
failure path; on success we need to carry the job over to the Finish
phase.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>

diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 4ab6ab7387a32fd391c6aca3b9eee468f785551b..9a4f19fda722034016f2cc21c01c68334352f6a8 100644 (file)
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -3522,7 +3522,7 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
         (pipe(dataFD) < 0 || virSetCloseExec(dataFD[1]) < 0)) {
         virReportSystemError(errno, "%s",
                              _("cannot create pipe for tunnelled migration"));
-        goto endjob;
+        goto stopjob;
     }
 
     virObjectUnref(priv->qemuCaps);
@@ -3530,11 +3530,11 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
                                                 vm->def->emulator,
                                                 vm->def->os.machine);
     if (!priv->qemuCaps)
-        goto endjob;
+        goto stopjob;
 
     if (!(migrateFrom = qemuMigrationPrepareIncoming(vm, tunnel, protocol,
                                                      listenAddress, port)))
-        goto endjob;
+        goto stopjob;
 
     /* Start the QEMU daemon, with the same command-line arguments plus
      * -incoming $migrateFrom
@@ -3545,14 +3545,14 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
                          VIR_QEMU_PROCESS_START_PAUSED |
                          VIR_QEMU_PROCESS_START_AUTODESTROY) < 0) {
         virDomainAuditStart(vm, "migrated", false);
-        goto endjob;
+        goto stopjob;
     }
 
     if (tunnel) {
         if (virFDStreamOpen(st, dataFD[1]) < 0) {
             virReportSystemError(errno, "%s",
                                  _("cannot pass pipe for tunnelled migration"));
-            goto stop;
+            goto stopjob;
         }
         dataFD[1] = -1; /* 'st' owns the FD now & will close it */
     }
@@ -3560,17 +3560,17 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
     if (qemuMigrationSetCompression(driver, vm,
                                     flags & VIR_MIGRATE_COMPRESSED,
                                     QEMU_ASYNC_JOB_MIGRATION_IN) < 0)
-        goto stop;
+        goto stopjob;
 
     if (STREQ_NULLABLE(protocol, "rdma") &&
         virProcessSetMaxMemLock(vm->pid, vm->def->mem.hard_limit << 10) < 0) {
-        goto stop;
+        goto stopjob;
     }
 
     if (qemuMigrationSetPinAll(driver, vm,
                                flags & VIR_MIGRATE_RDMA_PIN_ALL,
                                QEMU_ASYNC_JOB_MIGRATION_IN) < 0)
-        goto stop;
+        goto stopjob;
 
     if (mig->lockState) {
         VIR_DEBUG("Received lockstate %s", mig->lockState);
@@ -3593,7 +3593,7 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
         if (qemuMigrationStartNBDServer(driver, vm, listenAddress,
                                         nmigrate_disks, migrate_disks) < 0) {
             /* error already reported */
-            goto endjob;
+            goto stopjob;
         }
         cookieFlags |= QEMU_MIGRATION_COOKIE_NBD;
     }
@@ -3608,7 +3608,7 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
     }
 
     if (qemuDomainCleanupAdd(vm, qemuMigrationPrepareCleanup) < 0)
-        goto endjob;
+        goto stopjob;
 
     if (!(flags & VIR_MIGRATE_OFFLINE)) {
         virDomainAuditStart(vm, "migrated", true);
@@ -3647,12 +3647,13 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver,
     virNWFilterUnlockFilterUpdates();
     return ret;
 
- stop:
-    virDomainAuditStart(vm, "migrated", false);
-    qemuProcessStop(driver, vm, VIR_DOMAIN_SHUTOFF_FAILED,
-                    VIR_QEMU_PROCESS_STOP_MIGRATED);
+ stopjob:
+    if (vm->def->id != -1) {
+        virDomainAuditStart(vm, "migrated", false);
+        qemuProcessStop(driver, vm, VIR_DOMAIN_SHUTOFF_FAILED,
+                        VIR_QEMU_PROCESS_STOP_MIGRATED);
+    }
 
- endjob:
     qemuMigrationJobFinish(driver, vm);
     goto cleanup;
 }