Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple emulated TPMs

On Sun, Mar 13, 2016 at 06:54:38PM -0400, Stefan Berger wrote:

This patch implements a proxy 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.

Tested-by: Jarkko Sakkinen <redacted>

My testing procedure was:

* Wine running TPM 2.0 simulator on the host side. [1]
* QEMU running an OS image with this patch. [2]
* Wrote a script for proxying the simulator: tpm2-simulator-vtpm. [3]
* Run some smoke tests: python -m unittest -v tpm2_smoke. [3]

[1] http://research.microsoft.com/en-us/downloads/35116857-e544-4003-8e7b-584182dc6833/
[2] git://git.infradead.org/users/jjs/buildroot-tpmdd.git
[3] git://git.infradead.org/users/jjs/tpm2-scripts.git

/Jarkko

Signed-off-by: Stefan Berger <redacted>
CC: linux-kernel@vger.kernel.org
CC: linux-doc@vger.kernel.org
CC: linux-api@vger.kernel.org
---
 drivers/char/tpm/Kconfig          |  10 +
 drivers/char/tpm/Makefile         |   1 +
 drivers/char/tpm/tpm_vtpm_proxy.c | 572 ++++++++++++++++++++++++++++++++++++++
 include/uapi/linux/Kbuild         |   1 +
 include/uapi/linux/vtpm_proxy.h   |  42 +++
 5 files changed, 626 insertions(+)
 create mode 100644 drivers/char/tpm/tpm_vtpm_proxy.c
 create mode 100644 include/uapi/linux/vtpm_proxy.h

/Jarkko