qemu: Allow seamless migration for domains with multiple graphics

Since commit 23e8b5d8, the code is refactored in a way that supports
domains with multiple graphics elements and commit 37b41520 allows
starting such domains.  However none of those commits take migration
into account.  Even though qemu doesn't support relocation for
anything else than SPICE and for no more than one graphics, there is no
reason to hardcode one graphics into this part of the code as well.

src/qemu/qemu_migration.c

@@ -427,19 +427,22 @@ qemuMigrationCookieAddGraphics(qemuMigrationCookiePtr mig,
                                virQEMUDriverPtr driver,
                                virDomainObjPtr dom)
 {
+    size_t i = 0;
+
     if (mig->flags & QEMU_MIGRATION_COOKIE_GRAPHICS) {
         virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                        _("Migration graphics data already present"));
         return -1;
     }
 
-    if (dom->def->ngraphics == 1 &&
-        (dom->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC ||
-         dom->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE)) {
-        if (!(mig->graphics =
-              qemuMigrationCookieGraphicsAlloc(driver, dom->def->graphics[0])))
-            return -1;
-        mig->flags |= QEMU_MIGRATION_COOKIE_GRAPHICS;
+    for (i = 0; i < dom->def->ngraphics; i++) {
+       if (dom->def->graphics[i]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE) {
+           if (!(mig->graphics =
+                 qemuMigrationCookieGraphicsAlloc(driver, dom->def->graphics[i])))
+               return -1;
+           mig->flags |= QEMU_MIGRATION_COOKIE_GRAPHICS;
+           break;
+       }
     }
 
     return 0;
@@ -1602,11 +1605,16 @@ qemuMigrationWaitForSpice(virQEMUDriverPtr driver,
     qemuDomainObjPrivatePtr priv = vm->privateData;
     bool wait_for_spice = false;
     bool spice_migrated = false;
+    size_t i = 0;
 
-    if (vm->def->ngraphics == 1 &&
-        vm->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE &&
-        virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_SEAMLESS_MIGRATION))
-        wait_for_spice = true;
+    if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_SEAMLESS_MIGRATION)) {
+        for (i = 0; i < vm->def->ngraphics; i++) {
+            if (vm->def->graphics[i]->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE) {
+                wait_for_spice = true;
+                break;
+            }
+        }
+    }
 
     if (!wait_for_spice)
         return 0;