linux-kernel - Re: [PATCH v9 2/2] tpm: Add support for event log pointer found in TPM2 ACPI table

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Date:   Tue, 7 Jul 2020 05:24:57 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Jerry Snitselaar <jsnitsel@...hat.com>
Cc:     Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-security-module@...r.kernel.org,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH v9 2/2] tpm: Add support for event log pointer found in
 TPM2 ACPI table

On Mon, Jul 06, 2020 at 04:57:28PM -0700, Jerry Snitselaar wrote:
> 
> Jarkko Sakkinen @ 2020-07-06 16:09 MST:
> 
> > On Mon, Jul 06, 2020 at 02:19:53PM -0400, Stefan Berger wrote:
> >> From: Stefan Berger <stefanb@...ux.ibm.com>
> >> 
> >> In case a TPM2 is attached, search for a TPM2 ACPI table when trying
> >> to get the event log from ACPI. If one is found, use it to get the
> >> start and length of the log area. This allows non-UEFI systems, such
> >> as SeaBIOS, to pass an event log when using a TPM2.
> >> 
> >> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> >
> > Do you think that QEMU with TPM 1.2 emulator turned on would be a viable
> > way to test this?
> >
> > I'm anyway more worried about breaking existing TPM 1.2 functionality
> > and that requires only QEMU without extras.
> >
> > /Jarkko
> 
> The 1.2 bits should be functionally the same as before, right?

Yes. You should be able to read event log with TPM 1.2 as before.

/Jarkko