Testing TPM Physical Presence Interface in OS

[miczyg1]

Dasharo version
Any

Dasharo variant
Any

Question text

While we already know how PPI works in FW setup more or less (switching PCR banks. clearing TPM, hierarchy management, etc.), TPM PPI is also used by the OS runtime to pass requests to the pre-OS environment (i.e. FW). SOme TPM operations may require platform hierarchy which is taken by the FW itself, so OS has to have meanings to perform these operations. That is why PPI exists.

We should analyze how Linux (and Windows?) can be used to test if PPI works.

TPM PPI specs: https://trustedcomputinggroup.org/resource/tcg-physical-presence-interface-specification/

[miczyg1]

Moved to Dasharo/open-source-firmware-validation#622