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gEfiSmmPciRootBridgeIoProtocolGuid

Include/Protocol/SmmPciRootBridgeIo.h

PROTOCOL Information

PROTOCOL's Guid NamePROTOCOL's Guid
gEfiSmmPciRootBridgeIoProtocolGuid{ 0x8bc1714d, 0xffcb, 0x41c3, { 0x89, 0xdc, 0x6c, 0x74, 0xd0, 0x6d, 0x98, 0xea }}

Refer to Header File

MdePkg/Include/Protocol/SmmPciRootBridgeIo.h