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

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Message-ID: <20170504091738.rxl77hjzf6vnpuda@intel.com>
Date:   Thu, 4 May 2017 12:17:38 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stefan Berger <stefanb@...ux.vnet.ibm.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 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.

/Jarkko