netdev - Re: [PATCH v3 1/8] vdpa: add bind_mm/unbind

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Date:   Thu, 23 Mar 2023 10:58:05 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org, stefanha@...hat.com,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Andrey Zhadchenko <andrey.zhadchenko@...tuozzo.com>,
        eperezma@...hat.com, netdev@...r.kernel.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/8] vdpa: add bind_mm/unbind_mm callbacks

On Tue, Mar 21, 2023 at 11:42 PM Stefano Garzarella <sgarzare@...hat.com> wrote:
>
> 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@...hat.com>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>

Acked-by: Jason Wang <jasowang@...hat.com>

Thanks

> ---
>
> Notes:
>     v2:
>     - removed `struct task_struct *owner` param (unused for now, maybe
>       useful to support cgroups) [Jason]
>     - add unbind_mm callback [Jason]
>
>  include/linux/vdpa.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 43f59ef10cc9..369c21394284 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -290,6 +290,14 @@ 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
>   */
> @@ -351,6 +359,8 @@ 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);
> --
> 2.39.2
>