Re: [Xen-devel] GPU passthrough on ARM

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 24/01/18 22:10, Martin Kelly wrote:
> Hi,
Hello,

> Does anyone know if GPU passthrough is supported on ARM? (e.g. for a GPU 
> integrated into an ARM SoC). I checked documentation and the code, but I 
> couldn't tell for sure.
> If so, what are the hardware requirements for it? If not, is it feasible 
> to do in the future?
Xen Arm supports device integrated into an ARM SoC. In general we highly 
recommend to have the GPU behind an IOMMU. So passthrough would be fully 
secure.
Does your platform has an IOMMU? If so which one? Do you know if the GPU 
is behind it?
It would be possible to do passthrough without IOMMU, but that's more 
complex and would require some hack in Xen to make sure the guest memory 
is direct mapped (e.g guest physical address = host physical address).
For more documentation on how to do it (see [1] and [2]).

Cheers,

[1] 
https://events.static.linuxfound.org/sites/events/files/slides/talk_5.pdf
[2] https://wiki.xen.org/images/1/17/Device_passthrough_xen.pdf

> Thanks,
> Martin
>
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--
Julien Grall

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