vdpa: add bind_mm/unbind_mm callbacks

These new optional callbacks is used to bind/unbind the device to
a specific address space so the vDPA framework can use VA when
these callbacks are implemented.

Suggested-by: Jason Wang <jasowang@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20230404131326.44403-2-sgarzare@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index f2064fa..2f1af73 100644 (file)
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -305,6 +305,14 @@ struct vdpa_map_file {
  *                             @vdev: vdpa device
  *                             @idx: virtqueue index
  *                             Returns pointer to structure device or error (NULL)
+ * @bind_mm:                   Bind the device to a specific address space
+ *                             so the vDPA framework can use VA when this
+ *                             callback is implemented. (optional)
+ *                             @vdev: vdpa device
+ *                             @mm: address space to bind
+ * @unbind_mm:                 Unbind the device from the address space
+ *                             bound using the bind_mm callback. (optional)
+ *                             @vdev: vdpa device
  * @free:                      Free resources that belongs to vDPA (optional)
  *                             @vdev: vdpa device
  */
@@ -370,6 +378,8 @@ struct vdpa_config_ops {
        int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
                              unsigned int asid);
        struct device *(*get_vq_dma_dev)(struct vdpa_device *vdev, u16 idx);
+       int (*bind_mm)(struct vdpa_device *vdev, struct mm_struct *mm);
+       void (*unbind_mm)(struct vdpa_device *vdev);
 
        /* Free device resources */
        void (*free)(struct vdpa_device *vdev);