linux-kernel - Re: [PATCH v9 1/2] acpi: Extend TPM2 ACPI table with missing log fields

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Date:   Mon, 06 Jul 2020 15:02:14 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        jarkko.sakkinen@...ux.intel.com, linux-acpi@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Stefan Berger <stefanb@...ux.ibm.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH v9 1/2] acpi: Extend TPM2 ACPI table with missing log fields


Stefan Berger @ 2020-07-06 11:19 MST:

> 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 define
> a new structure acpi_tpm2_phy that holds these optional new fields.
> The new fields 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
>
> https://trustedcomputinggroup.org/wp-content/uploads/TCG_ACPIGeneralSpecification_v1.20_r8.pdf
>
> Signed-off-by: Stefan Berger <stefanb@...ux.ibm.com>
> Cc: linux-acpi@...r.kernel.org
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Reviewed-by: Jerry Snitselaar <jsnitsel@...hat.com>

> ---
>  include/acpi/actbl3.h | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h
> index b0b163b9efc6..bdcac69fa6bd 100644
> --- a/include/acpi/actbl3.h
> +++ b/include/acpi/actbl3.h
> @@ -415,6 +415,13 @@ struct acpi_table_tpm2 {
>  	/* Platform-specific data follows */
>  };
>  
> +/* Optional trailer for revision 4 holding platform-specific data */
> +struct acpi_tpm2_phy {
> +	u8  start_method_specific[12];
> +	u32 log_area_minimum_length;
> +	u64 log_area_start_address;
> +};
> +
>  /* Values for start_method above */
>  
>  #define ACPI_TPM2_NOT_ALLOWED                       0