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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 03/09/2016 01:01 PM, Andy Lutomirski wrote:
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.
Nifty!

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?

The vtpm driver allows to use an independent trousers instance in each container.

Using the VTPM_NEW_DEV ioctl the container mgmt. stack can create a /dev/tpmX (X=0,1,2,...) device and a file descriptor. The file descriptor is passed to a vTPM instance, the /dev/tpmX is moved into the container, meaning a device with the same major/minor numbers is created in the container. This then allows each container to talk to an independent vTPM. The vTPM can either be 1.2 or 2.

   Stefan

--Andy
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux