Compatibility Considerations

  1. So far, we have not observed self-modified-code in SMM image or executable code in data section. As such, we believe the PE image protection is compatible.

  2. The protection for the SMM communication buffer may cause a #PF exception in SMM if the SMI handler does not perform the check recommended in [SecureSmmComm].

  3. Some legacy Compatibility Support Module (CSM) drivers may need co-work with SMM module. Then the SMM driver need access the legacy region. As such these memory regions should be allocated as ReservedMemory, such as BIOS data area (BDA) or extended BIOS data area (EBDA).

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