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

From: Andy Lutomirski
Date: Wed Mar 09 2016 - 13:01:35 EST

On Wed, Mar 9, 2016 at 9:39 AM, Stefan Berger
<stefanb@xxxxxxxxxxxxxxxxxx> 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.


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?