On Fri, 26 Apr 2024 at 16:16, Roth, Michael via groups.io <Michael.Roth=amd....@groups.io> wrote: > > On Fri, Apr 26, 2024 at 08:51:20AM -0500, Roth, Michael via groups.io 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. > > Tom just noticed another spot where a non-leaf C-bit needs to be cleared > (the one mapping the GHCB page). It doesn't affect patch functionality > but should be included for completeness of this change, so will send a > quick v3 with this addressed. > > -Mike >
While at it, could you please fix your email setup and use 8bit transfer encoding instead of quoted printable? Also, please put me on cc so I don't have to apply the garbled groups.io copy. -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#118343): https://edk2.groups.io/g/devel/message/118343 Mute This Topic: https://groups.io/mt/105750506/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
