Re: [PATCH 3/3] x86/sev: add a SVSM vTPM platform device

Jarkko Sakkinen
2025-01-23T09:50:46Z

On Wed Jan 22, 2025 at 11:29 PM EET, Dionna Amalie Glaze wrote:
> I can appreciate this viewpoint. It even surfaced Microsoft's fTPM
> paper to me, which solves some interesting problems we need to solve
> in SVSM too. So thanks for that.
>
> Just to clarify, you're not asking for SVSM to implement the TIS-MMIO
> interface instead, but rather to use the fTPM stack, which could make
> SVSM calls a TEE device operation?

I don't really know what I'm asking because this is barely even a
PoC, and I state it like this knowingly.

You should make the argument, and the case for the solution. Then
it is my turn to comment on that scheme.

That said, I would not give high odds for acceptance of a duplicate
TPM stack succeeding.

BR, Jarkko