* [PATCH] tpm: Restore functionality to xen vtpm driver.
@ 2016-12-22 20:41 Dr. Greg Wettstein
2016-12-23 7:17 ` Greg KH
2017-01-10 15:39 ` [Xen-devel] " Boris Ostrovsky
0 siblings, 2 replies; 3+ messages in thread
From: Dr. Greg Wettstein @ 2016-12-22 20:41 UTC (permalink / raw)
To: linux-kernel; +Cc: xen-devel, xen-users, stable, dgdegra
Functionality of the xen-tpmfront driver was lost secondary to
the introduction of xenbus multi-page support in the following
commit:
ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d
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
device:
<3>vtpm vtpm-0: tpm_transmit: tpm_send: error -62
<3>vtpm vtpm-0: A TPM error (-62) occurred attempting to determine the timeouts
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.
Signed-off-by: Dr. Greg Wettstein <greg@enjellic.com>
---
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 5aaa268..dd83a07 100644
--- a/drivers/char/tpm/xen-tpmfront.c
+++ b/drivers/char/tpm/xen-tpmfront.c
@@ -203,7 +203,7 @@ static int setup_ring(struct xenbus_device *dev, struct tpm_private *priv)
return -ENOMEM;
}
- rv = xenbus_grant_ring(dev, &priv->shr, 1, &gref);
+ rv = xenbus_grant_ring(dev, priv->shr, 1, &gref);
if (rv < 0)
return rv;
--
2.2.2
--
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] tpm: Restore functionality to xen vtpm driver.
2016-12-22 20:41 [PATCH] tpm: Restore functionality to xen vtpm driver Dr. Greg Wettstein
@ 2016-12-23 7:17 ` Greg KH
2017-01-10 15:39 ` [Xen-devel] " Boris Ostrovsky
1 sibling, 0 replies; 3+ messages in thread
From: Greg KH @ 2016-12-23 7:17 UTC (permalink / raw)
To: greg; +Cc: linux-kernel, xen-devel, xen-users, stable, dgdegra
On Thu, Dec 22, 2016 at 02:41:52PM -0600, Dr. Greg Wettstein wrote:
> Functionality of the xen-tpmfront driver was lost secondary to
> the introduction of xenbus multi-page support in the following
> commit:
>
> ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d
>
> 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
> device:
>
> <3>vtpm vtpm-0: tpm_transmit: tpm_send: error -62
>
> <3>vtpm vtpm-0: A TPM error (-62) occurred attempting to determine the timeouts
>
> 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.
>
> Signed-off-by: Dr. Greg Wettstein <greg@enjellic.com>
<formletter>
This is not the correct way to submit patches for inclusion in the
stable kernel tree. Please read Documentation/stable_kernel_rules.txt
for how to do this properly.
</formletter>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Xen-devel] [PATCH] tpm: Restore functionality to xen vtpm driver.
2016-12-22 20:41 [PATCH] tpm: Restore functionality to xen vtpm driver Dr. Greg Wettstein
2016-12-23 7:17 ` Greg KH
@ 2017-01-10 15:39 ` Boris Ostrovsky
1 sibling, 0 replies; 3+ messages in thread
From: Boris Ostrovsky @ 2017-01-10 15:39 UTC (permalink / raw)
To: greg, linux-kernel; +Cc: xen-users, dgdegra, stable, xen-devel
On 12/22/2016 03:41 PM, Dr. Greg Wettstein wrote:
> Functionality of the xen-tpmfront driver was lost secondary to
> the introduction of xenbus multi-page support in the following
> commit:
>
> ccc9d90a9a8b5c4ad7e9708ec41f75ff9e98d61d
>
> 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
> device:
>
> <3>vtpm vtpm-0: tpm_transmit: tpm_send: error -62
>
> <3>vtpm vtpm-0: A TPM error (-62) occurred attempting to determine the timeouts
>
> 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.
>
> Signed-off-by: Dr. Greg Wettstein <greg@enjellic.com>
Greg,
Are you planning to re-submit this?
Thanks.
-boris
> ---
> 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 5aaa268..dd83a07 100644
> --- a/drivers/char/tpm/xen-tpmfront.c
> +++ b/drivers/char/tpm/xen-tpmfront.c
> @@ -203,7 +203,7 @@ static int setup_ring(struct xenbus_device *dev, struct tpm_private *priv)
> return -ENOMEM;
> }
>
> - rv = xenbus_grant_ring(dev, &priv->shr, 1, &gref);
> + rv = xenbus_grant_ring(dev, priv->shr, 1, &gref);
> if (rv < 0)
> return rv;
>
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-12-22 20:41 [PATCH] tpm: Restore functionality to xen vtpm driver Dr. Greg Wettstein
2016-12-23 7:17 ` Greg KH
2017-01-10 15:39 ` [Xen-devel] " Boris Ostrovsky
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