Re: [Xen-devel] GPU passthrough on ARM

[Martin Kelly <mkelly@xxxxxxxx>]

On 01/30/2018 11:53 AM, Oleksandr Tyshchenko wrote:
> > I'm wondering what the GPU would like to the guest. Would it be the same
> > interface as on a native machine, or would I need PV drivers?
> It depends on what guest domain contains.
>
> If DomU has both Display Unit and GPU assigned then PV driver is not needed.
> So, here we have the same interface as on a native machine.
>
> But if DomU has only GPU assigned then something like PV display
> frontend is needed here,
> plus PV display backend running in a guest domain which owns Display Unit.
>
> The possible hint is that if Display Unit has independent crtcs,
> connectors, etc it might be possible to split it
> into the separate units and assign them to different guest domains (of
> course, the HW must be splittable).
> I think, this would avoid PV driver usage.
That makes sense. Thanks again for your help understanding this better.

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