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

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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.
> 
> Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
> CC: linux-kernel@vger.kernel.org
> CC: linux-doc@vger.kernel.org
> CC: linux-api@vger.kernel.org

Alternative to this would be to have /dev/vtpmx create:

* /dev/vtpm0 for the server
* /dev/tpm0 for the client

This is how David Howell's PoC worked and that's why I want
to make this alternative visible.

The server could even respawn without container noticing it.
This solution have better availability properties.

/Jarkko

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[PATCH v8 00/10] Multi-instance vTPM proxy driver Stefan Berger <stefanb@linux.vnet.ibm.com> - 2016-03-14 00:00 +0100
  [PATCH v8 05/10] tpm: Split out the devm stuff from tpmm_chip_alloc Stefan Berger <stefanb@linux.vnet.ibm.com> - 2016-03-14 00:00 +0100
  [PATCH v8 03/10] tpm: Provide strong locking for device removal Stefan Berger <stefanb@linux.vnet.ibm.com> - 2016-03-14 00:00 +0100
  [PATCH v8 09/10] tpm: Initialize TPM and get durations and timeouts Stefan Berger <stefanb@linux.vnet.ibm.com> - 2016-03-14 00:00 +0100
  [PATCH v8 01/10] tpm: Get rid of chip->pdev Stefan Berger <stefanb@linux.vnet.ibm.com> - 2016-03-14 00:00 +0100
  [PATCH v8 08/10] tpm: Proxy driver for supporting multiple emulated TPMs Stefan Berger <stefanb@linux.vnet.ibm.com> - 2016-03-14 00:00 +0100
    Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple  emulated TPMs Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-03-14 17:30 +0100
    Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple  emulated TPMs Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-03-16 13:20 +0100
      Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple  emulated TPMs Stefan Berger <stefanb@linux.vnet.ibm.com> - 2016-03-16 15:00 +0100
      Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple  emulated TPMs Jason Gunthorpe <jgunthorpe@obsidianresearch.com> - 2016-03-16 18:50 +0100
        Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple  emulated TPMs Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-03-16 21:40 +0100
    Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple  emulated TPMs Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> - 2016-03-16 21:50 +0100

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