[PATCH v2] tpm: Restore functionality to xen vtpm driver.
- Date: Thu, 13 Sep 2018 17:25:51 -0400
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Subject: [PATCH v2] tpm: Restore functionality to xen vtpm driver.
From: "Dr. Greg Wettstein" <greg@xxxxxxxxxxxxxxxxx>
Functionality of the xen-tpmfront driver was lost secondary to
the introduction of xenbus multi-page support in commit ccc9d90a9a8b
("xenbus_client: Extend interface to support multi-page ring").
In this commit a pointer to the shared page address was being
passed to the xenbus_grant_ring() function rather then the
address of the shared page itself. This resulted in a situation
where the driver would attach to the vtpm-stubdom but any attempt
to send a command to the stub domain would timeout.
A diagnostic finding for this regression is the following error
message being generated when the xen-tpmfront driver probes for a
<3>vtpm vtpm-0: tpm_transmit: tpm_send: error -62
<3>vtpm vtpm-0: A TPM error (-62) occurred attempting to determine
This fix is relevant to all kernels from 4.1 forward which is the
release in which multi-page xenbus support was introduced.
Daniel De Graaf formulated the fix by code inspection after the
regression point was located.
Fixes: ccc9d90a9a8b ("xenbus_client: Extend interface to support multi-page ring")
Signed-off-by: Dr. Greg Wettstein <greg@xxxxxxxxxxxx>
[boris: fixed commit message formatting, added Fixes tag]
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.1+
drivers/char/tpm/xen-tpmfront.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
index 911475d36800..b150f87f38f5 100644
@@ -264,7 +264,7 @@ static int setup_ring(struct xenbus_device *dev, struct tpm_private *priv)
- rv = xenbus_grant_ring(dev, &priv->shr, 1, &gref);
+ rv = xenbus_grant_ring(dev, priv->shr, 1, &gref);
if (rv < 0)