From: "Stefan Berger" <stefanb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
To: Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>
Cc: Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
"linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Subject: Re: [PATCH v6 08/11] tpm: Driver for supporting multiple emulated TPMs
Date: Wed, 9 Mar 2016 13:44:29 -0500 [thread overview]
Message-ID: <201603091844.u29IiWPo016087@d03av01.boulder.ibm.com> (raw)
In-Reply-To: <CALCETrXDfHRdFnqK15o1yD8106sn4e6Susr9j7=GGi4sb-p0qQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org> wrote on 03/09/2016 01:01:05 PM:
>
> On Wed, Mar 9, 2016 at 9:39 AM, Stefan Berger
> <stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org> wrote:
> > This patch implements a driver for supporting multiple emulated TPMs
in a
> > system.
> >
> > The driver implements a device /dev/vtpmx that is used to created
> > a client device pair /dev/tpmX (e.g., /dev/tpm10) and a server side
that
> > is accessed using a file descriptor returned by an ioctl.
> > The device /dev/tpmX is the usual TPM device created by the core TPM
> > driver. Applications or kernel subsystems can send TPM commands to it
> > and the corresponding server-side file descriptor receives these
> > commands and delivers them to an emulated TPM.
>
> Nifty!
>
> Is anyone considering writing a modification or replacement of
> trousers that creates claims the real tpm and exposes a vtpm that
> handles multiplexing internally? Does the vtpm driver intelligently
> support multiple simultaneous clients?
The vtpm driver allows to use an independent trousers instance in each
container.
Using the VTPM_NEW_DEV ioctl the container mgmt. stack can create a
/dev/tpmX (X=0,1,2,...) device and a file descriptor. The file descriptor
is passed to a vTPM instance, the /dev/tpmX is moved into the container,
meaning a device with the same major/minor numbers is created in the
container. This then allows each container to talk to an independent vTPM.
The vTPM can either be 1.2 or 2.
Stefan
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next prev parent reply other threads:[~2016-03-09 18:44 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-09 17:39 [PATCH v6 00/11] Multi-instance vTPM driver Stefan Berger
[not found] ` <1457545170-30120-1-git-send-email-stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2016-03-09 17:39 ` [PATCH v6 01/11] tpm: Get rid of chip->pdev Stefan Berger
2016-03-09 17:39 ` [PATCH v6 02/11] tpm: Get rid of devname Stefan Berger
2016-03-09 17:39 ` [PATCH v6 03/11] tpm: Provide strong locking for device removal Stefan Berger
2016-03-09 17:39 ` [PATCH v6 04/11] tpm: Get rid of module locking Stefan Berger
2016-03-09 17:39 ` [PATCH v6 05/11] tpm: Split out the devm stuff from tpmm_chip_alloc Stefan Berger
2016-03-09 17:39 ` [PATCH v6 06/11] tpm: Replace device number bitmap with IDR Stefan Berger
[not found] ` <1457545170-30120-7-git-send-email-stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2016-03-10 13:21 ` Jarkko Sakkinen
[not found] ` <20160310132156.GA16320-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-03-10 16:26 ` Stefan Berger
[not found] ` <201603101622.u2AGMCv3031274@d01av05.pok.ibm.com>
[not found] ` <201603101622.u2AGMCv3031274-8DuMPbUlb4HImUpY6SP3GEEOCMrvLtNR@public.gmane.org>
2016-03-10 16:40 ` Jarkko Sakkinen
2016-03-09 17:39 ` [PATCH v6 07/11] tpm: Introduce TPM_CHIP_FLAG_VIRTUAL Stefan Berger
2016-03-09 17:39 ` [PATCH v6 11/11] A test program for vTPM device creation Stefan Berger
[not found] ` <1457545170-30120-12-git-send-email-stefanb-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2016-03-10 20:57 ` [PATCH v6 11/11] A test program for vTPM devicecreation Stefan Berger
[not found] ` <201603102058.u2AKw7Ie013400@d01av04.pok.ibm.com>
[not found] ` <201603102058.u2AKw7Ie013400-YREtIfBy6dDImUpY6SP3GEEOCMrvLtNR@public.gmane.org>
2016-03-11 10:30 ` Jarkko Sakkinen
[not found] ` <20160311103001.GA13368-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2016-03-11 13:16 ` Stefan Berger
2016-03-09 17:39 ` [PATCH v6 08/11] tpm: Driver for supporting multiple emulated TPMs Stefan Berger
2016-03-09 17:39 ` Stefan Berger
2016-03-09 18:01 ` Andy Lutomirski
2016-03-09 18:01 ` Andy Lutomirski
[not found] ` <CALCETrXDfHRdFnqK15o1yD8106sn4e6Susr9j7=GGi4sb-p0qQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-09 18:44 ` Stefan Berger [this message]
2016-03-10 2:34 ` Stefan Berger
2016-03-10 2:57 ` Andy Lutomirski
2016-03-10 17:38 ` Stefan Berger
2016-03-10 17:38 ` Stefan Berger
2016-03-10 14:15 ` Jarkko Sakkinen
2016-03-10 16:39 ` Jarkko Sakkinen
2016-03-10 16:39 ` Jarkko Sakkinen
2016-03-10 17:30 ` Stefan Berger
2016-03-10 17:30 ` Stefan Berger
2016-03-11 9:50 ` Jarkko Sakkinen
2016-03-10 17:32 ` Stefan Berger
2016-03-10 17:32 ` Stefan Berger
2016-03-11 10:20 ` Jarkko Sakkinen
2016-03-11 10:20 ` Jarkko Sakkinen
2016-03-10 22:12 ` Jason Gunthorpe
2016-03-09 17:39 ` [PATCH v6 09/11] tpm: Initialize TPM and get durations and timeouts Stefan Berger
2016-03-09 17:39 ` Stefan Berger
2016-03-09 17:39 ` [PATCH v6 10/11] tpm: Add documentation for the tpm_vtpm device driver Stefan Berger
2016-03-09 17:39 ` Stefan Berger
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