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

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Date:   Fri, 12 May 2023 12:22:13 -0400
From:   Ross Philipson <ross.philipson@...cle.com>
To:     Matthew Garrett <mjg59@...f.ucam.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-crypto@...r.kernel.org, iommu@...ts.linux-foundation.org,
        kexec@...ts.infradead.org, linux-efi@...r.kernel.org,
        dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, ardb@...nel.org,
        James.Bottomley@...senpartnership.com, luto@...capital.net,
        nivedita@...m.mit.edu, kanth.ghatraju@...cle.com,
        trenchboot-devel@...glegroups.com,
        Ross Philipson <ross.philipson@...cle.com>
Subject: Re: [PATCH v6 13/14] tpm: Allow locality 2 to be set when
 initializing the TPM for Secure Launch

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