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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] GPU passthrough on ARM
On Fri, Jan 26, 2018 at 3:49 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote: > Hi, > > I am CCing Oleksandr. He knows better than me this platform. Hi, Julien. OK, thank you, I will try to provide some pointers. > > Cheers, > > On 26/01/18 00:29, Martin Kelly wrote: >> >> On 01/25/2018 04:17 AM, Julien Grall wrote: >>> >>> >>> >>> 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 >>> >> >> Hi Julien, >> >> Thanks very much for the information. I'm looking at the Renesas R-Car H3 >> R8A7795, which has an IOMMU (using the Linux ipmmu-vmsa driver in >> drivers/iommu/ipmmu-vmsa.c). Looking at the device tree for it >> (r8a7795.dtsi), it appears you could pass through the display@feb00000 node >> for the DRM driver. >> >> I did notice this patch series, which didn't get merged: >> >> https://lists.xenproject.org/archives/html/xen-devel/2017-07/msg02679.html >> >> Presumably that driver would be needed in Xen. >> >> Are there any gotchas I'm missing? Is GPU passthrough on ARM something >> that is "theoretically doable" or something that has been done already and >> shown to be performant? >> >> Thanks again, >> Martin > > > -- > Julien Grall > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxxx > https://lists.xenproject.org/mailman/listinfo/xen-devel -- Regards, Oleksandr Tyshchenko _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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