Hi,

> The execbuffer IOCTL is now read-write to allow the userspace to read the
> out-fence.

>  #define DRM_IOCTL_VIRTGPU_EXECBUFFER \
> -     DRM_IOW(DRM_COMMAND_BASE + DRM_VIRTGPU_EXECBUFFER,\
> +     DRM_IOWR(DRM_COMMAND_BASE + DRM_VIRTGPU_EXECBUFFER,\
>               struct drm_virtgpu_execbuffer)

That changes the ioctl number and breaks the userspace api.

cheers,
  Gerd

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