TCG2 Physical Presence Support in OVMF

[Jason Dickens <jdickens@grammatech.com>]

All,
I'm working with a secure boot enabled OVMF build of EDK II and Xen and 
have questions about TCG2 support, both status in general and specific 
questions below.

I'm trying to get the TCG Physical Presence protocol to work or at least 
understand more about why it can't in my case.

Specifically, I have found a key function in 
DxeTcg2PhysicalPresenceLib.c called 
Tcg2PhysicalPresenceLibProcessRequest. This appears to be the method 
that gets user confirmation and then performs the requested operations 
after a reboot? However, I cannot determine where this function is 
called? If it is currently dead code then I would like to know where it 
should be called and why its not connected in?

BTW: I understand that on Xen i'm also going to have issues with the SMM 
piece due to q35 and SMRAM problems, but independent of the Xen issues, 
I would like a clear picture of the current limitations in OVMF 
regarding TPM 2.0 operation? Are there functions needing implementation, 
that I could also contribute to?

Any help would be appreciated.

Thanks,
Jason