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Re: [PATCH for-4.17?] x86/pvh: report ACPI VFCT table to dom0 if present
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Tue, 8 Nov 2022 17:49:06 +0100
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- Cc: Henry.Wang@xxxxxxx, ray.huang@xxxxxxx, Alexander.Deucher@xxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 08 Nov 2022 16:49:32 +0000
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On Tue, Nov 08, 2022 at 05:35:04PM +0100, Jan Beulich wrote:
> On 08.11.2022 17:31, Roger Pau Monné wrote:
> > On Tue, Nov 08, 2022 at 04:56:17PM +0100, Jan Beulich wrote:
> >> On 08.11.2022 14:55, Roger Pau Monne wrote:
> >>> The VFCT ACPI table is used by AMD GPUs to expose the vbios ROM image
> >>> from the firmware instead of doing it on the PCI ROM on the physical
> >>> device.
> >>
> >> I can't find any mention of VFCT in the ACPI 6.3 spec, nor anywhere
> >> under Linux'es include/acpi/. I don't mind the addition that you're
> >> doing, but there needs to be a pointer to a sufficiently "official"
> >> spec.
> >
> > I've also asked for some kind of official spec, as I would assume it
> > should be in:
> >
> > https://uefi.org/acpi
> >
> > With the rest of tables not in the spec itself, but there's none.
> >
> > I could add a link to the Linux header, but that's suboptimal IMO.
> >
> > Are you fine with this as-is, or would you like me to elaborate about
> > the lack of an official spec in the commit description?
>
> A pointer to the Linux bits is better than nothing, but as just said
> in reply to Ray there needs to be sufficient guarantee that "VFCT"
> really isn't going to be used for something else down the road.
I will leave this for the AMD folks to clarify. I would assume AMD
has not picked a random table signature and started using it without
having it reserved with the ACPI folks. Having that said I don't see
the signature in the table of reserved ones in the ACPI 6.5 spec
from August.
Regards, Roger.
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