> My question would be "what is the actual problem you are trying to > solve?". One problem that needs to be solved is sharing buffers between devices. With the out-of-tree Wayland device, to share virtio-gpu buffers we've been using the virtio resource id. However, that approach isn't necessarily the right approach, especially once there are more devices allocating/sharing buffers. Specifically, this issue came up in the recent RFC about adding a virtio video decoder device. Having a centralized buffer allocator device is one way to deal with sharing buffers, since it gives a definitive buffer identifier that can be used by all drivers/devices to refer to the buffer. That being said, I think the device as proposed is insufficient, as such a centralized buffer allocator should probably be responsible for allocating all shared buffers, not just linear guest ram buffers. -David
