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gEfiSmmCpuServiceProtocolGuid

Include/Protocol/SmmCpuService.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiSmmCpuServiceProtocolGuid{ 0x1d202cab, 0xc8ab, 0x4d5c, { 0x94, 0xf7, 0x3c, 0xfc, 0xc0, 0xd3, 0xd3, 0x35 }}

Refer to Header File

UefiCpuPkg/Include/Protocol/SmmCpuService.h