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

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Message-ID: <dfd2d622-90cb-9621-7b7d-5282f5ee7359@linux.ibm.com>
Date:   Fri, 19 Jun 2020 11:14:20 -0400
From:   Stefan Berger <stefanb@...ux.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        "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
Subject: Re: [PATCH v3] acpi: Extend TPM2 ACPI table with missing log fields

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?


Any chance to get v4 applied?


>
> /Jarkko