linux-kernel - [PATCH v5 12/12] tpm: Allow locality 2 to be set when initializing the TPM for Secure Launch

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Message-Id: <1645070085-14255-13-git-send-email-ross.philipson@oracle.com>
Date:   Wed, 16 Feb 2022 22:54:45 -0500
From:   Ross Philipson <ross.philipson@...cle.com>
To:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-crypto@...r.kernel.org, kexec@...ts.infradead.org
Cc:     iommu@...ts.linux-foundation.org, ross.philipson@...cle.com,
        dpsmith@...rtussolutions.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, hpa@...or.com, luto@...capital.net,
        nivedita@...m.mit.edu, kanth.ghatraju@...cle.com,
        trenchboot-devel@...glegroups.com
Subject: [PATCH v5 12/12] tpm: Allow locality 2 to be set when initializing the TPM for Secure Launch

The Secure Launch MLE environment uses PCRs that are only accessible from
the DRTM locality 2. By default the TPM drivers always initialize the
locality to 0. When a Secure Launch is in progress, initialize the
locality to 2.

Signed-off-by: Ross Philipson <ross.philipson@...cle.com>
---
 drivers/char/tpm/tpm-chip.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index b009e74..7b8d4bb 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -23,6 +23,7 @@
 #include <linux/major.h>
 #include <linux/tpm_eventlog.h>
 #include <linux/hw_random.h>
+#include <linux/slaunch.h>
 #include "tpm.h"
 
 DEFINE_IDR(dev_nums_idr);
@@ -34,12 +35,18 @@
 
 static int tpm_request_locality(struct tpm_chip *chip)
 {
+	int locality;
 	int rc;
 
 	if (!chip->ops->request_locality)
 		return 0;
 
-	rc = chip->ops->request_locality(chip, 0);
+	if (slaunch_get_flags() & SL_FLAG_ACTIVE)
+		locality = 2;
+	else
+		locality = 0;
+
+	rc = chip->ops->request_locality(chip, locality);
 	if (rc < 0)
 		return rc;
 
-- 
1.8.3.1