From: Stefan Berger <stefanb@linux.vnet.ibm.com>
To: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: tpmdd-devel@lists.sourceforge.net,
jgunthorpe@obsidianresearch.com,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
linux-api@vger.kernel.org, dhowells@redhat.com
Subject: Re: [PATCH v8 08/10] tpm: Proxy driver for supporting multiple emulated TPMs
Date: Wed, 16 Mar 2016 09:49:57 -0400 [thread overview]
Message-ID: <56E96485.2000100@linux.vnet.ibm.com> (raw)
In-Reply-To: <20160316120916.GA14820@intel.com>
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
next prev parent reply other threads:[~2016-03-16 13:50 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-13 22:54 [PATCH v8 00/10] Multi-instance vTPM proxy driver Stefan Berger
2016-03-13 22:54 ` [PATCH v8 01/10] tpm: Get rid of chip->pdev Stefan Berger
2016-03-13 22:54 ` [PATCH v8 02/10] tpm: Get rid of devname Stefan Berger
2016-03-13 22:54 ` [PATCH v8 03/10] tpm: Provide strong locking for device removal Stefan Berger
2016-03-13 22:54 ` [PATCH v8 04/10] tpm: Get rid of module locking Stefan Berger
2016-03-13 22:54 ` [PATCH v8 05/10] tpm: Split out the devm stuff from tpmm_chip_alloc Stefan Berger
2016-03-13 22:54 ` [PATCH v8 06/10] tpm: Replace device number bitmap with IDR Stefan Berger
2016-03-15 5:58 ` Jarkko Sakkinen
2016-03-13 22:54 ` [PATCH v8 07/10] tpm: Introduce TPM_CHIP_FLAG_VIRTUAL Stefan Berger
2016-03-13 22:54 ` [PATCH v8 08/10] tpm: Proxy driver for supporting multiple emulated TPMs Stefan Berger
2016-03-14 16:26 ` Jarkko Sakkinen
2016-03-16 12:09 ` Jarkko Sakkinen
2016-03-16 13:49 ` Stefan Berger [this message]
2016-03-16 17:49 ` Jason Gunthorpe
2016-03-16 20:37 ` Jarkko Sakkinen
2016-03-16 20:42 ` Jarkko Sakkinen
2016-03-17 17:45 ` Stefan Berger
2016-03-18 8:52 ` Jarkko Sakkinen
2016-03-18 13:06 ` Jarkko Sakkinen
2016-03-13 22:54 ` [PATCH v8 09/10] tpm: Initialize TPM and get durations and timeouts Stefan Berger
2016-03-22 6:34 ` [v8,09/10] " Jarkko Sakkinen
2016-03-22 10:54 ` Stefan Berger
2016-03-29 15:31 ` [v8,09/10] tpm: Initialize TPM and get durations and timeoutsg Jarkko Sakkinen
2016-03-29 15:53 ` Stefan Berger
2016-03-13 22:54 ` [PATCH v8 10/10] tpm: Add documentation for the tpm_vtpm device driver Stefan Berger
2016-03-29 16:24 ` [PATCH v8 00/10] Multi-instance vTPM proxy driver Jarkko Sakkinen
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