qemu: Refactor virtio-input capabilities checks

The checks and error messages are mostly the same across
all virtio-input devices, so we can avoid having multiple
copies of the same code.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_domain.c

@@ -5957,43 +5957,33 @@ qemuDomainDeviceDefValidateInput(const virDomainInputDef *input,
                                  const virDomainDef *def ATTRIBUTE_UNUSED,
                                  virQEMUCapsPtr qemuCaps)
 {
+    const char *baseName;
+    int cap;
+    int ccwCap;
+
     if (input->bus != VIR_DOMAIN_INPUT_BUS_VIRTIO)
         return 0;
 
     switch ((virDomainInputType)input->type) {
     case VIR_DOMAIN_INPUT_TYPE_MOUSE:
-        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_MOUSE) ||
-            (input->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW &&
-             !virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_MOUSE_CCW))) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                           _("virtio-mouse is not supported by this QEMU binary"));
-            return -1;
-        }
+        baseName = "virtio-mouse";
+        cap = QEMU_CAPS_VIRTIO_MOUSE;
+        ccwCap = QEMU_CAPS_DEVICE_VIRTIO_MOUSE_CCW;
         break;
     case VIR_DOMAIN_INPUT_TYPE_TABLET:
-        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_TABLET) ||
-            (input->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW &&
-             !virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_TABLET_CCW))) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                           _("virtio-tablet is not supported by this QEMU binary"));
-            return -1;
-        }
+        baseName = "virtio-tablet";
+        cap = QEMU_CAPS_VIRTIO_TABLET;
+        ccwCap = QEMU_CAPS_DEVICE_VIRTIO_TABLET_CCW;
         break;
     case VIR_DOMAIN_INPUT_TYPE_KBD:
-        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_KEYBOARD) ||
-            (input->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW &&
-             !virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VIRTIO_KEYBOARD_CCW))) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                           _("virtio-keyboard is not supported by this QEMU binary"));
-            return -1;
-        }
+        baseName = "virtio-keyboard";
+        cap = QEMU_CAPS_VIRTIO_KEYBOARD;
+        ccwCap = QEMU_CAPS_DEVICE_VIRTIO_KEYBOARD_CCW;
         break;
     case VIR_DOMAIN_INPUT_TYPE_PASSTHROUGH:
-        if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_INPUT_HOST)) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                           _("virtio-input-host is not supported by this QEMU binary"));
-            return -1;
-        }
+        baseName = "virtio-input-host";
+        cap = QEMU_CAPS_VIRTIO_INPUT_HOST;
+        ccwCap = QEMU_CAPS_LAST;
         break;
     case VIR_DOMAIN_INPUT_TYPE_LAST:
     default:
@@ -6002,6 +5992,15 @@ qemuDomainDeviceDefValidateInput(const virDomainInputDef *input,
         return -1;
     }
 
+    if (!virQEMUCapsGet(qemuCaps, cap) ||
+        (input->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_CCW &&
+         !virQEMUCapsGet(qemuCaps, ccwCap))) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("%s is not supported by this QEMU binary"),
+                       baseName);
+        return -1;
+    }
+
     return 0;
 }