On Thu, Dec 15, 2022 at 12:30 AM Stefano Garzarella <sgarzare@xxxxxxxxxx> wrote:
>
> This new optional callback is used to bind the device to a specific
> address space so the vDPA framework can use VA when this callback
> is implemented.
>
> Suggested-by: Jason Wang <jasowang@xxxxxxxxxx>
> Signed-off-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
> ---
> include/linux/vdpa.h | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 6d0f5e4e82c2..34388e21ef3f 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -282,6 +282,12 @@ struct vdpa_map_file {
> * @iova: iova to be unmapped
> * @size: size of the area
> * Returns integer: success (0) or error (< 0)
> + * @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
Do we need an unbind or did a NULL mm mean unbind?
> + * @owner: process that owns the address space
Any reason we need the task_struct here?
Thanks
> * @free: Free resources that belongs to vDPA (optional)
> * @vdev: vdpa device
> */
> @@ -341,6 +347,8 @@ struct vdpa_config_ops {
> u64 iova, u64 size);
> int (*set_group_asid)(struct vdpa_device *vdev, unsigned int group,
> unsigned int asid);
> + int (*bind_mm)(struct vdpa_device *vdev, struct mm_struct *mm,
> + struct task_struct *owner);
>
> /* Free device resources */
> void (*free)(struct vdpa_device *vdev);
> --
> 2.38.1
>
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