virtio: add virtio_device_set_child_bus_name.

Add virtio_device_set_child_bus_name function.

It will be used with virtio-serial-x and virtio-scsi-x to set the
child bus name before calling virtio-x-device's init.
Signed-off-by: NKONRAD Frederic <fred.konrad@greensocs.com>
Tested-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Message-id: 1367330931-12994-3-git-send-email-fred.konrad@greensocs.com
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

hw/virtio/virtio.c

@@ -1087,6 +1087,18 @@ EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq)
     return &vq->host_notifier;
 }
 
+void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name)
+{
+    if (vdev->bus_name) {
+        g_free(vdev->bus_name);
+        vdev->bus_name = NULL;
+    }
+
+    if (bus_name) {
+        vdev->bus_name = g_strdup(bus_name);
+    }
+}
+
 static int virtio_device_init(DeviceState *qdev)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
@@ -1099,11 +1111,23 @@ static int virtio_device_init(DeviceState *qdev)
     return 0;
 }
 
+static int virtio_device_exit(DeviceState *qdev)
+{
+    VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
+
+    if (vdev->bus_name) {
+        g_free(vdev->bus_name);
+        vdev->bus_name = NULL;
+    }
+    return 0;
+}
+
 static void virtio_device_class_init(ObjectClass *klass, void *data)
 {
     /* Set the default value here. */
     DeviceClass *dc = DEVICE_CLASS(klass);
     dc->init = virtio_device_init;
+    dc->exit = virtio_device_exit;
     dc->bus_type = TYPE_VIRTIO_BUS;
 }
 

include/hw/virtio/virtio.h

@@ -118,6 +118,7 @@ struct VirtIODevice
     uint16_t device_id;
     bool vm_running;
     VMChangeStateEntry *vmstate;
+    char *bus_name;
 };
 
 typedef struct VirtioDeviceClass {
@@ -149,6 +150,9 @@ void virtio_init(VirtIODevice *vdev, const char *name,
                          uint16_t device_id, size_t config_size);
 void virtio_cleanup(VirtIODevice *vdev);
 
+/* Set the child bus name. */
+void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name);
+
 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
                             void (*handle_output)(VirtIODevice *,
                                                   VirtQueue *));