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

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On 03/16/2016 08:09 AM, Jarkko Sakkinen wrote:
> 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.

My initial implementation had this as well.

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

A TPM should be stable enough to not have to be respawned...

     Stefan

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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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