Hob GUID used to pass a TCG_PCR_EVENT from a TPM PEIM to a TPM DXE Driver.
Include/Guid/TcgEventHob.h

GUID Information

GUID's Guid Name	GUID's Guid
gTcgEventEntryHobGuid	{ 0x2b9ffb52, 0x1b13, 0x416f, { 0xa8, 0x7b, 0xbc, 0x93, 0xd, 0xef, 0x92, 0xa8 }}

Refer to Header File