Re: [edk2-devel] [Patch V2 1/3] UefiCpuPkg: Create MpInformation.h in UefiCpuPkg

["Laszlo Ersek" <lersek@redhat.com>]

On 11/17/23 10:39, duntan wrote:
> Copy MpInformation.h and gMpInformationHobGuid to
> UefiCpuPkg.
> Previously, the HOB is defined, created and consumed
> only in StandaloneMmPkg. The HOB contains the number
> of processors and EFI_PROCESSOR_INFORMATION structure.
> This is the same as the information that PiSmmCpuDxeSmm
> uses EfiMpServiceProtocolGuid to get.
> The incoming plan is to create gMpInformationHobGuid
> for both StandaloneMm and legacy DXE_SMM in early
> phase. Then PiSmmCpuDxeSmm can consume the hob, which can
> simplified code logic about consuming MpService Protocol.
> So move this HOB definition to UefiCpuPkg.
> 
> Signed-off-by: Dun Tan <dun.tan@intel.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Rahul Kumar <rahul1.kumar@intel.com>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> ---
>  UefiCpuPkg/Include/Guid/MpInformation.h | 39 +++++++++++++++++++++++++++++++++++++++
>  UefiCpuPkg/UefiCpuPkg.dec               |  3 +++
>  2 files changed, 42 insertions(+)
> 
> diff --git a/UefiCpuPkg/Include/Guid/MpInformation.h b/UefiCpuPkg/Include/Guid/MpInformation.h
> new file mode 100644
> index 0000000000..29da80d4df
> --- /dev/null
> +++ b/UefiCpuPkg/Include/Guid/MpInformation.h
> @@ -0,0 +1,39 @@
> +/** @file
> +  EFI MP information protocol provides a lightweight MP_SERVICES_PROTOCOL.
> +
> +  MP information protocol only provides static information of MP processor.
> +
> +  If SwitchBSP or Enable/DisableAP in MP service is called between the HOB
> +  production and HOB consumption, EFI_PROCESSOR_INFORMATION.StatusFlag and
> +  NumberOfEnabledProcessors fields in this HOB may be invalidated.

Thanks for the update.

Acked-by: Laszlo Ersek <lersek@redhat.com>



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