qemu: Add controllers in specified order

qemu is sensitive to the order of arguments passed. Hence, if a
device requires a controller, the controller cmd string must
precede device cmd string. The same apply for controllers, when
for instance ccid controller requires usb controller. So
controllers create partial ordering in which they should be added
to qemu cmd line.

src/qemu/qemu_command.c

@@ -4446,6 +4446,16 @@ qemuBuildCommandLine(virConnectPtr conn,
     int usbcontroller = 0;
     bool usblegacy = false;
     uname_normalize(&ut);
+    int contOrder[] = {
+        /* We don't add an explicit IDE or FD controller because the
+         * provided PIIX4 device already includes one. It isn't possible to
+         * remove the PIIX4. */
+        VIR_DOMAIN_CONTROLLER_TYPE_USB,
+        VIR_DOMAIN_CONTROLLER_TYPE_SCSI,
+        VIR_DOMAIN_CONTROLLER_TYPE_SATA,
+        VIR_DOMAIN_CONTROLLER_TYPE_VIRTIO_SERIAL,
+        VIR_DOMAIN_CONTROLLER_TYPE_CCID,
+    };
 
     VIR_DEBUG("conn=%p driver=%p def=%p mon=%p json=%d "
               "caps=%p migrateFrom=%s migrateFD=%d "
@@ -5024,15 +5034,11 @@ qemuBuildCommandLine(virConnectPtr conn,
     }
 
     if (qemuCapsGet(caps, QEMU_CAPS_DEVICE)) {
-        for (j = 0; j < 1; j++) {
+        for (j = 0; j < ARRAY_CARDINALITY(contOrder); j++) {
             for (i = 0; i < def->ncontrollers; i++) {
                 virDomainControllerDefPtr cont = def->controllers[i];
 
-                /* We don't add an explicit IDE or FD controller because the
-                 * provided PIIX4 device already includes one. It isn't possible to
-                 * remove the PIIX4. */
-                if (cont->type == VIR_DOMAIN_CONTROLLER_TYPE_IDE ||
-                    cont->type == VIR_DOMAIN_CONTROLLER_TYPE_FDC)
+                if (cont->type != contOrder[j])
                     continue;
 
                 /* Also, skip USB controllers with type none.*/