Re: [PATCH v6 08/11] tpm: Driver for supporting multiple emulated TPMs

["Stefan Berger" <stefanb-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>]

[-- Attachment #1.1: Type: text/plain, Size: 1584 bytes --]

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



[-- Attachment #1.2: Type: text/html, Size: 1868 bytes --]

[-- Attachment #2: Type: text/plain, Size: 291 bytes --]

------------------------------------------------------------------------------
Transform Data into Opportunity.
Accelerate data analysis in your applications with
Intel Data Analytics Acceleration Library.
Click to learn more.
http://pubads.g.doubleclick.net/gampad/clk?id=278785111&iu=/4140

[-- Attachment #3: Type: text/plain, Size: 192 bytes --]

_______________________________________________
tpmdd-devel mailing list
tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
https://lists.sourceforge.net/lists/listinfo/tpmdd-devel