RE: [PATCH v1 8/8] vfio-iommufd: Support IO page table replacement

[Tian, Kevin]

> From: Nicolin Chen <nicolinc@xxxxxxxxxx>
> Sent: Thursday, February 2, 2023 3:05 PM
> 
> Remove the vdev->iommufd_attached check, since the kernel can internally
> handle a replacement of the IO page table now.
> 
> Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
> ---
>  drivers/vfio/iommufd.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c
> index 7e09defbcffe..f9e89b3eef69 100644
> --- a/drivers/vfio/iommufd.c
> +++ b/drivers/vfio/iommufd.c
> @@ -111,9 +111,6 @@ int vfio_iommufd_physical_attach_ioas(struct
> vfio_device *vdev, u32 *pt_id)
>  		return 0;
>  	}
> 
> -	if (vdev->iommufd_attached)
> -		return -EBUSY;
> -
>  	rc = iommufd_device_attach(vdev->iommufd_device, pt_id);
>  	if (rc)
>  		return rc;

also update vfio uapi description to explain the replace semantics.