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

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Message-Id: <daa25807-53cd-1abd-d2fa-57e01e37da9f@linux.vnet.ibm.com>
Date:   Thu, 4 May 2017 16:03:18 -0400
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     tpmdd-devel@...ts.sourceforge.net,
        LSM List <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 02:40 PM, Jarkko Sakkinen wrote:
> On Thu, May 04, 2017 at 07:14:27AM -0400, Stefan Berger wrote:
>> 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?
> What if we later on want to pass something else than locality to the
> backend? How that will work out?

'push' more data in front. 'pop' off by recipient. We could wrap the 
command in some form.

     Stefan

>
> /Jarkko
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