linux-kernel - Re: [PATCH v4] tpm_crb: request and relinquish locality 0

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Date:   Sat, 25 Mar 2017 21:52:11 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Jerry Snitselaar <jsnitsel@...hat.com>, gang.wei@...el.com
Cc:     Jarkko Sakkinen <jarkko.sakkinen@....fi>,
        tpmdd-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org, gang.wei@...el.com,
        Peter Huewe <peterhuewe@....de>,
        Marcel Selhorst <tpmdd@...horst.net>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] tpm_crb: request and relinquish locality 0

On Fri, Mar 24, 2017 at 11:25:57AM -0700, Jerry Snitselaar wrote:
> 
> Jarkko Sakkinen @ 2017-03-24 10:10 GMT:
> 
> > This commit adds support for requesting and relinquishing locality 0 in
> > tpm_crb for the course of command transmission.
> >
> > In order to achieve this, two new callbacks are added to struct
> > tpm_class_ops:
> >
> > - request_locality
> > - relinquish_locality
> >
> > With CRB interface you first set either requestAccess or relinquish bit
> > from TPM_LOC_CTRL_x register and then wait for locAssigned and
> > tpmRegValidSts bits to be set in the TPM_LOC_STATE_x register.
> >
> > The reason why were are doing this is to make sure that the driver
> > will work properly with Intel TXT that uses locality 2. There's no
> > explicit guarantee that it would relinquish this locality. In more
> > general sense this commit enables tpm_crb to be a well behaving
> > citizen in a multi locality environment.
> >
> > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> 
> Reviewed-by: Jerry Snitselaar <jsnitsel@...hat.com>
> Tested-by: Jerry Snitselaar <jsnitsel@...hat.com>
> 
> Tested on kabylake system that was hitting issues with earlier
> iteration. Still don't have platform to test it dealing with
> multi-locality enviroment.

I believe Jimmy (Gang Wei) has done such testing. Jimmy can you confirm
and possibly do re-test (there's a locality branch in my tree to ease
the testing) so that we could land this one?

/Jarkko