linux-kernel - Re: [PATCH 3/3] tpm: ibmvtpm: Add support for TPM 2

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Date:   Thu, 13 Feb 2020 14:35:08 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Stefan Berger <stefanb@...ux.ibm.com>
Cc:     Nayna <nayna@...ux.vnet.ibm.com>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        linux-integrity@...r.kernel.org, aik@...abs.ru,
        david@...son.dropbear.id.au, linux-kernel@...r.kernel.org,
        gcwilson@...ux.ibm.com
Subject: Re: [PATCH 3/3] tpm: ibmvtpm: Add support for TPM 2

On Thu, Feb 13, 2020 at 01:20:12PM -0500, Stefan Berger wrote:

> I don't want side effects for the TPM 1.2 case here, so I am only modifying
> the flag for the case where the new TPM 2 is being used.  Here's the code
> where it shows the effect.

I'm surprised this driver is using AUTO_STARTUP, it was intended for
embedded cases where their is no firmware to boot the TPM.

Chips using AUTO_STARTUP are basically useless for PCRs/etc.

I'd expect somthing called vtpm to have been started and PCRs working
before Linux is started??

Jason