qemu: Fix migration with dname

Destination libvirtd remembers the original name in the prepare phase
and clears it in the finish phase. The original name is used when
comparing domain name in migration cookie.

src/qemu/qemu_domain.c

@@ -231,6 +231,7 @@ static void qemuDomainObjPrivateFree(void *data)
     qemuDomainObjFreeJob(priv);
     VIR_FREE(priv->vcpupids);
     VIR_FREE(priv->lockState);
+    VIR_FREE(priv->origname);
 
     /* This should never be non-NULL if we get here, but just in case... */
     if (priv->mon) {

src/qemu/qemu_domain.h

@@ -126,6 +126,7 @@ struct _qemuDomainObjPrivate {
     int jobs_queued;
 
     unsigned long migMaxBandwidth;
+    char *origname;
 };
 
 struct qemuDomainWatchdogEvent

src/qemu/qemu_migration.c

@@ -254,12 +254,18 @@ error:
 static qemuMigrationCookiePtr
 qemuMigrationCookieNew(virDomainObjPtr dom)
 {
+    qemuDomainObjPrivatePtr priv = dom->privateData;
     qemuMigrationCookiePtr mig = NULL;
+    const char *name;
 
     if (VIR_ALLOC(mig) < 0)
         goto no_memory;
 
-    if (!(mig->name = strdup(dom->def->name)))
+    if (priv->origname)
+        name = priv->origname;
+    else
+        name = dom->def->name;
+    if (!(mig->name = strdup(name)))
         goto no_memory;
     memcpy(mig->uuid, dom->def->uuid, VIR_UUID_BUFLEN);
 
@@ -1064,6 +1070,7 @@ qemuMigrationPrepareAny(struct qemud_driver *driver,
     unsigned long long now;
     qemuMigrationCookiePtr mig = NULL;
     bool tunnel = !!st;
+    char *origname = NULL;
 
     if (virTimeMs(&now) < 0)
         return -1;
@@ -1078,7 +1085,7 @@ qemuMigrationPrepareAny(struct qemud_driver *driver,
 
     /* Target domain name, maybe renamed. */
     if (dname) {
-        VIR_FREE(def->name);
+        origname = def->name;
         def->name = strdup(dname);
         if (def->name == NULL)
             goto cleanup;
@@ -1095,6 +1102,8 @@ qemuMigrationPrepareAny(struct qemud_driver *driver,
     }
     def = NULL;
     priv = vm->privateData;
+    priv->origname = origname;
+    origname = NULL;
 
     if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen,
                                        QEMU_MIGRATION_COOKIE_LOCKSTATE)))
@@ -1175,6 +1184,7 @@ qemuMigrationPrepareAny(struct qemud_driver *driver,
     ret = 0;
 
 cleanup:
+    VIR_FREE(origname);
     virDomainDefFree(def);
     VIR_FORCE_CLOSE(dataFD[0]);
     VIR_FORCE_CLOSE(dataFD[1]);
@@ -2542,6 +2552,7 @@ qemuMigrationFinish(struct qemud_driver *driver,
     qemuMigrationCookiePtr mig = NULL;
     virErrorPtr orig_err = NULL;
     int cookie_flags = 0;
+    qemuDomainObjPrivatePtr priv = vm->privateData;
 
     VIR_DEBUG("driver=%p, dconn=%p, vm=%p, cookiein=%s, cookieinlen=%d, "
               "cookieout=%p, cookieoutlen=%p, flags=%lx, retcode=%d",
@@ -2695,8 +2706,10 @@ endjob:
     }
 
 cleanup:
-    if (vm)
+    if (vm) {
+        VIR_FREE(priv->origname);
         virDomainObjUnlock(vm);
+    }
     if (event)
         qemuDomainEventQueue(driver, event);
     qemuMigrationCookieFree(mig);