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

From: Stefan Berger
Date: Thu May 04 2017 - 16:03:37 EST

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
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.


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