[PATCH v3] drm/i915/gvt: throw error on unhandled vfio ioctls

[Alex Williamson]

On Wed, 21 Mar 2018 15:08:47 +0100
Gerd Hoffmann <kraxel at redhat.com> wrote:

> On unknown/unhandled ioctls the driver should return an error, so
> userspace knows it tried to use something unsupported.
> 
> Cc: stable at vger.kernel.org
> Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
> ---
>  drivers/gpu/drm/i915/gvt/kvmgt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index 021f722e24..f34d7f1e6c 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -1284,7 +1284,7 @@ static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
>  
>  	}
>  
> -	return 0;
> +	return -ENOTTY;
>  }
>  
>  static ssize_t

Reviewed-by: Alex Williamson <alex.williamson at redhat.com>