Hi Ray and Rahul,

Any comment on this patch ? If you are okay with the approach then can I
get Ack or R-b ?

-Brijesh

On 10/22/21 11:13 PM, Brijesh Singh via groups.io wrote:
> 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: 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


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