All, StandaloneMmPkg/Include/Guid/MpInformation.h contains the MP_INFORMATION_HOB_DATA HOB definition. This HOB is used for transfering MP information collected in non-SMM phase to standalone MM environment. #pragma pack(1) typedef struct { UINT64 NumberOfProcessors; UINT64 NumberOfEnabledProcessors; EFI_PROCESSOR_INFORMATION ProcessorInfoBuffer[]; } MP_INFORMATION_HOB_DATA; #pragma pack() extern EFI_GUID gMpInformationHobGuid; Is there any reason that the MP_INFORMATION_HOB_DATA HOB definition not documented in PI spec? If no reason, I do feel that PI spec needs to carry the HOB definition. Thoughts? Thanks, Ray -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#108307): https://edk2.groups.io/g/devel/message/108307 Mute This Topic: https://groups.io/mt/101187873/7686176 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/leave/12367111/7686176/1913456212/xyzzy [rebecca@openfw.io] -=-=-=-=-=-=-=-=-=-=-=-