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

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Message-ID: <20200623005718.GE28795@linux.intel.com>
Date:   Tue, 23 Jun 2020 03:57:18 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Stefan Berger <stefanb@...ux.ibm.com>,
        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
Subject: Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

On Fri, Jun 19, 2020 at 05:55:19PM +0200, Rafael J. Wysocki wrote:
> On Fri, Jun 19, 2020 at 5:14 PM Stefan Berger <stefanb@...ux.ibm.com> wrote:
> >
> > On 4/2/20 3:21 PM, Jarkko Sakkinen wrote:
> > > 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?
> >
> 
> It looks like I missed the previous message from Jarkko.
> 
> Yes, please, feel free to add my ACK to the patch, thanks!

OK, this is great, thanks. I'll pick it to my tree then.

/Jarkko