Hi,

> - doing this over dma-buf means we can only use this for the ww_mutx
>   dance, not for anything else. Which means we need another layer on top
>   for shared execbuf utils (which Gerd has started looking into, but I
>   felt like not quite the right approach yet in his first draft series).

FYI: this is in virtio-gpu for now, see virtio_gpu_array_*
in drivers/gpu/drm/virtio/virtgpu_gem.c

cheers,
  Gerd

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