Alex Bennée via Stratos-dev <stratos-...@op-lists.linaro.org> writes:
> Alyssa Ross <h...@alyssa.is> writes: > >> As I understand it, virtio-wayland is effectively deprecated in favour >> of sending Wayland messages over cross-domain virtio-gpu contexts. It's >> possible to do this now with an upstream kernel, whereas virtio-wayland >> always required a custom driver in the Chromium kernel. > > That's good to know. I guess there is nothing that prevents the final > display of virtual GPUs from multiple guests being mapped onto the > final presentation? The automotive use case seems to treat each > individual VM with a UI as presenting a surface which the final console > manager composites up together depending on safety rules to display to > the user. Well, in the Wayland use case, AIUI virtio-gpu is just a transport for the Wayland protocol + shared memory resources. The simplest case is just sending shared CPU memory buffers around (wl_shm), so there's not really any GPU involved in anything but name. Alternatively, it's possible to use dma-bufs, and graphics acceleration through the virtio-gpu devices, and yes, when doing that it's still possible for the host Wayland compositor to combine everything into one presentation — I think they're all just dma-bufs to it. Does that make sense? I'm also no expert on this but hopefully I'm not too far off.
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