[edk2-devel] [PATCH v6 02/29] OvmfPkg: reserve CPUID page for SEV-SNP
Gerd Hoffmann
kraxel at redhat.com
Fri Sep 3 06:28:02 UTC 2021
Hi,
> >> Is this snp-specific? Or could this also be used without snp?
> > This is SNP specific format and cannot be used without SNP.
>
> I should clarify the statement, the format itself does not contain
> anything SNP specific. However, the CPUID page format is documented in
> the SNP specific spec.
Who populates the page? qemu? sev-snp firmware?
> Are you thinking about using it for non SEV guest
> to avoid the VM exit ? If so, it should be very much possible.
Yes, that is the background. Avoiding vmexits would be one advantage.
Being able to test the code without SNP-capable hardware (for example
in CI) would be another one.
> For that
> we should define the format outside of SNP specific spec and make it a
> generic so that guest and HV's can implement it consume it in the
> non-SNP guest.
I think that would be useful.
take care,
Gerd
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