drm/virtio: drop DRM_AUTH usage from the driver

The authentication can be circumvented, by design, by using the render
node.

From the driver POV there is no distinction between primary and render
nodes, thus we can drop the token.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: virtualization@lists.linux-foundation.org
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: NEmil Velikov <emil.velikov@collabora.com>
Acked-by: NGerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190527081741.14235-12-emil.l.velikov@gmail.com

drivers/gpu/drm/virtio/virtgpu_ioctl.c

@@ -553,34 +553,34 @@ static int virtio_gpu_get_caps_ioctl(struct drm_device *dev,
 
 struct drm_ioctl_desc virtio_gpu_ioctls[DRM_VIRTIO_NUM_IOCTLS] = {
 	DRM_IOCTL_DEF_DRV(VIRTGPU_MAP, virtio_gpu_map_ioctl,
-			  DRM_AUTH | DRM_RENDER_ALLOW),
+			  DRM_RENDER_ALLOW),
 
 	DRM_IOCTL_DEF_DRV(VIRTGPU_EXECBUFFER, virtio_gpu_execbuffer_ioctl,
-			  DRM_AUTH | DRM_RENDER_ALLOW),
+			  DRM_RENDER_ALLOW),
 
 	DRM_IOCTL_DEF_DRV(VIRTGPU_GETPARAM, virtio_gpu_getparam_ioctl,
-			  DRM_AUTH | DRM_RENDER_ALLOW),
+			  DRM_RENDER_ALLOW),
 
 	DRM_IOCTL_DEF_DRV(VIRTGPU_RESOURCE_CREATE,
 			  virtio_gpu_resource_create_ioctl,
-			  DRM_AUTH | DRM_RENDER_ALLOW),
+			  DRM_RENDER_ALLOW),
 
 	DRM_IOCTL_DEF_DRV(VIRTGPU_RESOURCE_INFO, virtio_gpu_resource_info_ioctl,
-			  DRM_AUTH | DRM_RENDER_ALLOW),
+			  DRM_RENDER_ALLOW),
 
 	/* make transfer async to the main ring? - no sure, can we
 	 * thread these in the underlying GL
 	 */
 	DRM_IOCTL_DEF_DRV(VIRTGPU_TRANSFER_FROM_HOST,
 			  virtio_gpu_transfer_from_host_ioctl,
-			  DRM_AUTH | DRM_RENDER_ALLOW),
+			  DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(VIRTGPU_TRANSFER_TO_HOST,
 			  virtio_gpu_transfer_to_host_ioctl,
-			  DRM_AUTH | DRM_RENDER_ALLOW),
+			  DRM_RENDER_ALLOW),
 
 	DRM_IOCTL_DEF_DRV(VIRTGPU_WAIT, virtio_gpu_wait_ioctl,
-			  DRM_AUTH | DRM_RENDER_ALLOW),
+			  DRM_RENDER_ALLOW),
 
 	DRM_IOCTL_DEF_DRV(VIRTGPU_GET_CAPS, virtio_gpu_get_caps_ioctl,
-			  DRM_AUTH | DRM_RENDER_ALLOW),
+			  DRM_RENDER_ALLOW),
 };