BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275
Version 2 of the GHCB specification added a new VMGEXIT that the guest could use for querying the hypervisor features. One of the immediate users for it will be an AP creation code. When SEV-SNP is enabled, the guest can use the newly added AP_CREATE VMGEXIT to create the APs. The MpInitLib will check the hypervisor feature, and if AP_CREATE is available, it will use it. See GHCB spec version 2 for more details on the VMGEXIT. Cc: Michael Roth <michael.r...@amd.com> Cc: Ray Ni <ray...@intel.com> Cc: Rahul Kumar <rahul1.ku...@intel.com> Cc: Eric Dong <eric.d...@intel.com> Cc: James Bottomley <j...@linux.ibm.com> Cc: Min Xu <min.m...@intel.com> Cc: Jiewen Yao <jiewen....@intel.com> Cc: Tom Lendacky <thomas.lenda...@amd.com> Cc: Jordan Justen <jordan.l.jus...@intel.com> Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org> Cc: Erdem Aktas <erdemak...@google.com> Cc: Gerd Hoffmann <kra...@redhat.com> Acked-by: Ray Ni <ray...@intel.com> Acked-by: Gerd Hoffmann <kra...@redhat.com> Signed-off-by: Brijesh Singh <brijesh.si...@amd.com> --- UefiCpuPkg/UefiCpuPkg.dec | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec index 62acb291f309..7de66fde674c 100644 --- a/UefiCpuPkg/UefiCpuPkg.dec +++ b/UefiCpuPkg/UefiCpuPkg.dec @@ -396,5 +396,10 @@ [PcdsDynamic, PcdsDynamicEx] # @Prompt SEV-ES Status gUefiCpuPkgTokenSpaceGuid.PcdSevEsIsEnabled|FALSE|BOOLEAN|0x60000016 + ## This dynamic PCD contains the hypervisor features value obtained through the GHCB HYPERVISOR + # features VMGEXIT defined in the version 2 of GHCB spec. + # @Prompt GHCB Hypervisor Features + gUefiCpuPkgTokenSpaceGuid.PcdGhcbHypervisorFeatures|0x0|UINT64|0x60000018 + [UserExtensions.TianoCore."ExtraFiles"] UefiCpuPkgExtra.uni -- 2.25.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#84561): https://edk2.groups.io/g/devel/message/84561 Mute This Topic: https://groups.io/mt/87605558/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
