linux-kernel - Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality prepended to command

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Message-Id: <e8408f9b-d53d-5af0-3678-e851d78ba99e@linux.vnet.ibm.com>
Date:   Thu, 4 May 2017 07:14:27 -0400
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     tpmdd-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org,
        jgunthorpe@...idianresearch.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] tpm: vtpm_proxy: Add ioctl to request locality
 prepended to command

On 05/04/2017 05:17 AM, Jarkko Sakkinen wrote:
> On Wed, May 03, 2017 at 07:40:48PM -0400, Stefan Berger wrote:
>> On 05/03/2017 06:37 PM, Jarkko Sakkinen wrote:
>>> On Fri, Apr 28, 2017 at 09:02:18AM -0400, Stefan Berger wrote:
>>>> Add an ioctl to request that the locality be prepended to every TPM
>>>> command.
>>> Don't really understand this change. Why locality is prenpended?
>> Commands can be executed under locality 0-3 and for some commands it is
>> important to know which locality a user may have chosen. How else should we
>> convey that locality to the TPM emulator ?
> Why this is not in the commit message?
>
> More scalable way to do this would be to have a set of vtpm proxy
> commands. There could be a command for requesting and releasing
> locality. That would be more clean.

I would think that if someone wanted to use locality it's the client 
using /dev/tpm(rm)0 calling an ioctl or so and the vtpm proxy then 
merely passing that locality to the backend (TPM emulator). I suppose 
the intention is to support something like that following the addition 
of the new functions request_locality and release_locality?