linux-kernel - Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

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Date:   Thu, 2 Apr 2020 22:21:57 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        linux-integrity@...r.kernel.org,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-security-module@...r.kernel.org,
        Stefan Berger <stefanb@...ux.ibm.com>
Subject: Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

On Wed, Apr 01, 2020 at 11:05:36AM +0200, Rafael J. Wysocki wrote:
> On Wed, Apr 1, 2020 at 10:37 AM Jarkko Sakkinen
> <jarkko.sakkinen@...ux.intel.com> wrote:
> >
> > On Tue, Mar 31, 2020 at 05:49:49PM -0400, Stefan Berger wrote:
> > > From: Stefan Berger <stefanb@...ux.ibm.com>
> > >
> > > Recent extensions of the TPM2 ACPI table added 3 more fields
> > > including 12 bytes of start method specific parameters and Log Area
> > > Minimum Length (u32) and Log Area Start Address (u64). So, we extend
> > > the existing structure with these fields to allow non-UEFI systems
> > > to access the TPM2's log.
> > >
> > > The specification that has the new fields is the following:
> > >   TCG ACPI Specification
> > >   Family "1.2" and "2.0"
> > >   Version 1.2, Revision 8
> > >
> > > Adapt all existing table size calculations to use
> > > offsetof(struct acpi_table_tpm2, start_method_specific)
> > > [where start_method_specific is a newly added field]
> > > rather than sizeof(struct acpi_table_tpm2) so that the addition
> > > of the new fields does not affect current systems that may not
> > > have them.
> > >
> > > Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> > > Cc: linux-acpi@...r.kernel.org
> >
> > I think I'm cool with this but needs an ack from ACPI maintainer.
> >
> > Rafael, given that this not an intrusive change in any possible means,
> > can I pick this patch and put it to my next pull request?
> 
> Yes, please.
> 
> Thanks!

Great, thanks Rafael.

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Do you mind if I add your ack to the commit?

/Jarkko