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Date: Wed, 21 Mar 2018 09:44:32 -0600
From: Alex Williamson <alex.williamson@redhat.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: intel-gvt-dev@lists.freedesktop.org,
        David Airlie <airlied@linux.ie>,
        dri-devel@lists.freedesktop.org, stable@vger.kernel.org,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        Zhi Wang <zhi.a.wang@intel.com>
Subject: Re: [PATCH v3] drm/i915/gvt: throw error on unhandled vfio ioctls
Message-ID: <20180321094432.4aea0286@w520.home>
In-Reply-To: <20180321140847.572-1-kraxel@redhat.com>
References: <20180321140847.572-1-kraxel@redhat.com>
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On Wed, 21 Mar 2018 15:08:47 +0100
Gerd Hoffmann <kraxel@redhat.com> wrote:

> On unknown/unhandled ioctls the driver should return an error, so
> userspace knows it tried to use something unsupported.
> 
> Cc: stable@vger.kernel.org
> Signed-off-by: Gerd Hoffmann <kraxel@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@redhat.com>