diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 8d7e4daa866d47931f50507c61af6f0751deae69..a281e7cc0e1ef8161b1d003d60114c512778da87 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -2580,44 +2580,6 @@ qemuBuildUSBControllerDevStr(virDomainControllerDefPtr def,
 }
 
 
-/* qemuCheckSCSIControllerIOThreads:
- * @domainDef: Pointer to domain def
- * @def: Pointer to controller def
- * @qemuCaps: Capabilities
- *
- * If this controller definition has iothreads set, let's make sure the
- * configuration is right before adding to the command line
- *
- * Returns true if either supported or there are no iothreads for controller;
- * otherwise, returns false if configuration is not quite right.
- */
-static bool
-qemuCheckSCSIControllerIOThreads(const virDomainDef *domainDef,
-                                 virDomainControllerDefPtr def)
-{
-    if (!def->iothread)
-        return true;
-
-    if (def->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI &&
-        def->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW) {
-       virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                       _("IOThreads only available for virtio pci and "
-                         "virtio ccw controllers"));
-       return false;
-    }
-
-    /* Can we find the controller iothread in the iothreadid list? */
-    if (!virDomainIOThreadIDFind(domainDef, def->iothread)) {
-        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                       _("controller iothread '%u' not defined in iothreadid"),
-                       def->iothread);
-        return false;
-    }
-
-    return true;
-}
-
-
 /**
  * qemuBuildControllerDevStr:
  * @domainDef: domain definition
@@ -2656,12 +2618,9 @@ qemuBuildControllerDevStr(const virDomainDef *domainDef,
         case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_VIRTIO_SCSI:
             if (def->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW) {
                 virBufferAddLit(&buf, "virtio-scsi-ccw");
-                if (def->iothread) {
-                    if (!qemuCheckSCSIControllerIOThreads(domainDef, def))
-                        goto error;
+                if (def->iothread)
                     virBufferAsprintf(&buf, ",iothread=iothread%u",
                                       def->iothread);
-                }
             } else if (def->info.type ==
                        VIR_DOMAIN_DEVICE_ADDRESS_TYPE_VIRTIO_S390) {
                 virBufferAddLit(&buf, "virtio-scsi-s390");
@@ -2670,12 +2629,9 @@ qemuBuildControllerDevStr(const virDomainDef *domainDef,
                 virBufferAddLit(&buf, "virtio-scsi-device");
             } else {
                 virBufferAddLit(&buf, "virtio-scsi-pci");
-                if (def->iothread) {
-                    if (!qemuCheckSCSIControllerIOThreads(domainDef, def))
-                        goto error;
+                if (def->iothread)
                     virBufferAsprintf(&buf, ",iothread=iothread%u",
                                       def->iothread);
-                }
             }
             if (qemuBuildVirtioOptionsStr(&buf, def->virtio, qemuCaps) < 0)
                 goto error;
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 0a9f9203195d640a7947771d74257f5dcdab97f9..88d56b0b9f138add585a0a952f7946b50112f30d 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -4046,6 +4046,68 @@ qemuDomainDeviceDefValidateControllerIDE(const virDomainControllerDef *controlle
 }
 
 
+/* qemuDomainCheckSCSIControllerIOThreads:
+ * @controller: Pointer to controller def
+ * @def: Pointer to domain def
+ *
+ * If this controller definition has iothreads set, let's make sure the
+ * configuration is right before adding to the command line
+ *
+ * Returns true if either supported or there are no iothreads for controller;
+ * otherwise, returns false if configuration is not quite right.
+ */
+static bool
+qemuDomainCheckSCSIControllerIOThreads(const virDomainControllerDef *controller,
+                                       const virDomainDef *def)
+{
+    if (!controller->iothread)
+        return true;
+
+    if (controller->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_PCI &&
+        controller->info.type != VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW) {
+       virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                       _("IOThreads only available for virtio pci and "
+                         "virtio ccw controllers"));
+       return false;
+    }
+
+    /* Can we find the controller iothread in the iothreadid list? */
+    if (!virDomainIOThreadIDFind(def, controller->iothread)) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("controller iothread '%u' not defined in iothreadid"),
+                       controller->iothread);
+        return false;
+    }
+
+    return true;
+}
+
+
+static int
+qemuDomainDeviceDefValidateControllerSCSI(const virDomainControllerDef *controller,
+                                          const virDomainDef *def)
+{
+    switch ((virDomainControllerModelSCSI) controller->model) {
+        case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_VIRTIO_SCSI:
+            if (!qemuDomainCheckSCSIControllerIOThreads(controller, def))
+                return -1;
+            break;
+
+        case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_AUTO:
+        case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_BUSLOGIC:
+        case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LSILOGIC:
+        case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LSISAS1068:
+        case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_VMPVSCSI:
+        case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_IBMVSCSI:
+        case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LSISAS1078:
+        case VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LAST:
+            break;
+    }
+
+    return 0;
+}
+
+
 static int
 qemuDomainDeviceDefValidateController(const virDomainControllerDef *controller,
                                       const virDomainDef *def,
@@ -4069,8 +4131,11 @@ qemuDomainDeviceDefValidateController(const virDomainControllerDef *controller,
         ret = qemuDomainDeviceDefValidateControllerIDE(controller, def);
         break;
 
-    case VIR_DOMAIN_CONTROLLER_TYPE_FDC:
     case VIR_DOMAIN_CONTROLLER_TYPE_SCSI:
+        ret = qemuDomainDeviceDefValidateControllerSCSI(controller, def);
+        break;
+
+    case VIR_DOMAIN_CONTROLLER_TYPE_FDC:
     case VIR_DOMAIN_CONTROLLER_TYPE_SATA:
     case VIR_DOMAIN_CONTROLLER_TYPE_VIRTIO_SERIAL:
     case VIR_DOMAIN_CONTROLLER_TYPE_CCID: