Two months ago, Microsoft announced the Pluton security processor and that future AMD, Intel, Qualcomm CPUs will have it. It seems to be for this exact purpose:

> These sophisticated attack techniques target the communication channel between the CPU and TPM, which is typically a bus interface. (...) The Pluton design removes the potential for that communication channel to be attacked by building security directly into the CPU.

https://www.microsoft.com/security/blog/2020/11/17/meet-the-...

Isn’t that what Intel PTT is? Basically TPM baked in? Not entirely sure myself but I think PTT did away with the need for a discrete TPM coprocessor.