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From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Jarkko Sakkinen
	<jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Cc: Jerry Snitselaar
	<jsnitsel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	open list <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
	gang.wei-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org
Subject: Re: [PATCH v2] tpm_crb: request and relinquish locality 0
Date: Mon, 13 Mar 2017 10:34:52 -0600	[thread overview]
Message-ID: <20170313163452.GD22997@obsidianresearch.com> (raw)
In-Reply-To: <20170311130216.21419-1-jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

On Sat, Mar 11, 2017 at 03:02:14PM +0200, Jarkko Sakkinen wrote:
> Added two new callbacks to struct tpm_class_ops:
> 
> - request_locality
> - relinquish_locality
> 
> These are called before sending and receiving data from the TPM.  We
> update also tpm_tis_core to use these callbacks. Small modification to
> request_locality() is done so that it returns -EBUSY instead of locality
> number when check_locality() fails.

Make sense

I think you may as well do the other two drivers, even though you
can't run them the transformation looks safe enough to me.

> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
>  drivers/char/tpm/tpm-interface.c |  9 +++++++++
>  drivers/char/tpm/tpm_crb.c       | 41 +++++++++++++++++++++++++++++++++++++++-
>  drivers/char/tpm/tpm_tis_core.c  | 12 ++++--------
>  include/linux/tpm.h              |  3 ++-
>  4 files changed, 55 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> index e38c792..9c56581 100644
> +++ b/drivers/char/tpm/tpm-interface.c
> @@ -407,6 +407,12 @@ ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
>  	if (chip->dev.parent)
>  		pm_runtime_get_sync(chip->dev.parent);
>  
> +	if (chip->ops->request_locality)  {
> +		rc = chip->ops->request_locality(chip, 0);
> +		if (rc)
> +			goto out;

If request_locality fails we probably shouldn't call
relinquish_locality on the unwind path..

I think you should also put a relinquish_locality inside tpm_remove ?

> +	int (*request_locality)(struct tpm_chip *chip, int loc);
> +	void (*relinquish_locality)(struct tpm_chip *chip, int loc,
> bool force);

Let us document what force is supposed to do...

I'm not sure why we have it?

Jason

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  parent reply	other threads:[~2017-03-13 16:34 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-11 13:02 [PATCH v2] tpm_crb: request and relinquish locality 0 Jarkko Sakkinen
     [not found] ` <20170311130216.21419-1-jarkko.sakkinen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-03-12 19:47   ` Jerry Snitselaar
2017-03-13 11:58     ` Jarkko Sakkinen
2017-03-13 16:34   ` Jason Gunthorpe [this message]
     [not found]     ` <20170313163452.GD22997-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-03-13 20:12       ` Jarkko Sakkinen
     [not found]         ` <20170313201235.tvcyugdh7awqfrfq-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2017-03-13 20:43           ` Jason Gunthorpe

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