linux-kernel - [PATCH v8 1/2] acpi: Extend TPM2 ACPI table with missing log fields

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Message-Id: <20200626153948.2059251-2-stefanb@linux.vnet.ibm.com>
Date:   Fri, 26 Jun 2020 11:39:47 -0400
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     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
Cc:     Stefan Berger <stefanb@...ux.ibm.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH v8 1/2] acpi: Extend TPM2 ACPI table with missing log fields

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>
---
 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
-- 
2.26.2