MdePkg[all]  1.08
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gEfiSmmCommunicationProtocolGuid

Include/Protocol/SmmCommunication.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiSmmCommunicationProtocolGuid{ 0xc68ed8e2, 0x9dc6, 0x4cbd, { 0x9d, 0x94, 0xdb, 0x65, 0xac, 0xc5, 0xc3, 0x32 }}

Refer to Header File

MdePkg/Include/Protocol/SmmCommunication.h