diff mbox series

[v7,13/13] tpm: Allow locality 2 to be set when initializing the TPM for Secure Launch

Message ID 20231110222751.219836-14-ross.philipson@oracle.com
State New
Headers show
Series x86: Trenchboot secure dynamic launch Linux kernel support | expand

Commit Message

Ross Philipson Nov. 10, 2023, 10:27 p.m. UTC 
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@oracle.com>
---
 drivers/char/tpm/tpm-chip.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 42b1062e33cd..0217ceb96c42 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);
@@ -39,12 +40,18 @@  dev_t tpm_devt;
 
 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;