Re: [PATCH v2 2/4] vdpa: accept VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK backend feature

[Michael S. Tsirkin]

On Fri, Jun 09, 2023 at 11:21:25AM +0200, Eugenio Pérez wrote:
> Accepting VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK backend feature if
> userland sets it.
> 
> Signed-off-by: Eugenio Pérez <eperezma@xxxxxxxxxx>
> Acked-by: Shannon Nelson <shannon.nelson@xxxxxxx>

I don't get it, so all vdpa devices accept this automatically?
Should this not be up to the parent?

> ---
>  drivers/vhost/vdpa.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index bf77924d5b60..a3204406b73d 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -680,7 +680,8 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
>  			return -EFAULT;
>  		if (features & ~(VHOST_VDPA_BACKEND_FEATURES |
>  				 BIT_ULL(VHOST_BACKEND_F_SUSPEND) |
> -				 BIT_ULL(VHOST_BACKEND_F_RESUME)))
> +				 BIT_ULL(VHOST_BACKEND_F_RESUME) |
> +				 BIT_ULL(VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK)))
>  			return -EOPNOTSUPP;
>  		if ((features & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) &&
>  		     !vhost_vdpa_can_suspend(v))
> -- 
> 2.31.1