Re: [PATCH v6] drm/virtio: Add option to disable KMS support

[Gerd Hoffmann]

On Thu, Mar 02, 2023 at 03:35:06PM -0800, Rob Clark wrote:
> From: Rob Clark <robdclark@xxxxxxxxxxxx>
> 
> Add a build option to disable modesetting support.  This is useful in
> cases where the guest only needs to use the GPU in a headless mode, or
> (such as in the CrOS usage) window surfaces are proxied to a host
> compositor.
> 
> As the modesetting ioctls are a big surface area for potential security
> bugs to be found (it's happened in the past, we should assume it will
> again in the future), it makes sense to have a build option to disable
> those ioctls in cases where they serve no legitimate purpose.
> 
> v2: Use more if (IS_ENABLED(...))
> v3: Also permit the host to advertise no scanouts
> v4: Spiff out commit msg
> v5: Make num_scanouts==0 and DRM_VIRTIO_GPU_KMS=n behave the same
> v6: Drop conditionally building virtgpu_display.c and early-out of
>     it's init/fini fxns instead

Reviewed-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>