Re: [PATCH v6 13/14] tpm: Allow locality 2 to be set when initializing the TPM for Secure Launch

[Ross Philipson]

On 5/12/23 07:43, Matthew Garrett wrote:
> On Thu, May 04, 2023 at 02:50:22PM +0000, Ross Philipson wrote:
> > The Secure Launch MLE environment uses PCRs that are only accessible from
> > the DRTM locality 2. By default the TPM drivers always initialize the
> > locality to 0. When a Secure Launch is in progress, initialize the
> > locality to 2.
>
> This looks correct in itself, but looking at the CRB driver code I don't
> think locality support is actually implemented. Are there any SL systems
> using CRB?

We have never seen a system that supports CRB other than some firmware 
TPMs that don't work with TXT in the first place. CRB is unexplored 
territory at this point.

Thanks
Ross