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

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Date:	Wed, 9 Mar 2016 10:01:05 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
Cc:	tpmdd-devel@...ts.sourceforge.net,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH v6 08/11] tpm: Driver for supporting multiple emulated TPMs

On Wed, Mar 9, 2016 at 9:39 AM, Stefan Berger
<stefanb@...ux.vnet.ibm.com> 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?

--Andy