Re: [edk2-devel] [PATCH v4 0/3] OvmfPkg: Don't make APIC MMIO accesses with encryption bit set

["Ard Biesheuvel" <ardb@kernel.org>]

On Thu, 2 May 2024 at 11:06, Gerd Hoffmann <kraxel@redhat.com> wrote:
>
> On Wed, May 01, 2024 at 02:03:37PM GMT, Michael Roth wrote:
> > For the most part, OVMF will clear the encryption bit for MMIO regions,
> > but there is currently one known exception during SEC when the APIC
> > base address is accessed via MMIO with the encryption bit set for
> > SEV-ES/SEV-SNP guests. In the case of SEV-SNP, this requires special
> > handling on the hypervisor side which may not be available in the
> > future[1], so make the necessary changes in the SEC-configured page
> > table to clear the encryption bit for 4K region containing the APIC
> > base address.
> >
> > Since CpuPageTableLib is used to handle the splitting, some additional
> > care must be taken to clear the C-bit in all non-leaf PTEs since the
> > library expects that to be the case. Add handling for that when setting
> > up the SEC page table.
> >
> > While here, drop special handling for the APIC base address in the
> > SEV-ES/SNP #VC handler.
>
> Series:
> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
>

Thanks, I've picked these up now.


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