> From: Eugenio Pérez <eperezma@xxxxxxxxxx>
> Sent: Thursday, May 26, 2022 3:44 PM
> To: Michael S. Tsirkin <mst@xxxxxxxxxx>; kvm@xxxxxxxxxxxxxxx; virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> Jason Wang <jasowang@xxxxxxxxxx>; netdev@xxxxxxxxxxxxxxx
> Cc: martinh@xxxxxxxxxx; Stefano Garzarella <sgarzare@xxxxxxxxxx>; martinpo@xxxxxxxxxx; lvivier@xxxxxxxxxx; pabloc@xxxxxxxxxx;
> Parav Pandit <parav@xxxxxxxxxx>; Eli Cohen <elic@xxxxxxxxxx>; Dan Carpenter <dan.carpenter@xxxxxxxxxx>; Xie Yongji
> <xieyongji@xxxxxxxxxxxxx>; Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>; Zhang Min <zhang.min9@xxxxxxxxxx>; Wu Zongyong
> <wuzongyong@xxxxxxxxxxxxxxxxx>; lulu@xxxxxxxxxx; Zhu Lingshan <lingshan.zhu@xxxxxxxxx>; Piotr.Uminski@xxxxxxxxx; Si-Wei Liu <si-
> wei.liu@xxxxxxxxxx>; ecree.xilinx@xxxxxxxxx; gautam.dawar@xxxxxxx; habetsm.xilinx@xxxxxxxxx; tanuj.kamde@xxxxxxx;
> hanand@xxxxxxxxxx; dinang@xxxxxxxxxx; Longpeng <longpeng2@xxxxxxxxxx>
> Subject: [PATCH v4 1/4] vdpa: Add stop operation
>
> This operation is optional: It it's not implemented, backend feature bit
> will not be exposed.
>
> Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
> ---
> include/linux/vdpa.h | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 15af802d41c4..ddfebc4e1e01 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -215,6 +215,11 @@ struct vdpa_map_file {
> * @reset: Reset device
> * @vdev: vdpa device
> * Returns integer: success (0) or error (< 0)
> + * @stop: Stop or resume the device (optional, but it must
> + * be implemented if require device stop)
> + * @vdev: vdpa device
> + * @stop: stop (true), not stop (false)
> + * Returns integer: success (0) or error (< 0)
I assume after successful "stop" the device is guaranteed to stop processing descriptors and after resume it may process descriptors?
If that is so, I think it should be clear in the change log.
> * @get_config_size: Get the size of the configuration space includes
> * fields that are conditional on feature bits.
> * @vdev: vdpa device
> @@ -316,6 +321,7 @@ struct vdpa_config_ops {
> u8 (*get_status)(struct vdpa_device *vdev);
> void (*set_status)(struct vdpa_device *vdev, u8 status);
> int (*reset)(struct vdpa_device *vdev);
> + int (*stop)(struct vdpa_device *vdev, bool stop);
> size_t (*get_config_size)(struct vdpa_device *vdev);
> void (*get_config)(struct vdpa_device *vdev, unsigned int offset,
> void *buf, unsigned int len);
> --
> 2.31.1
