Re: [Qemu-devel] [PATCH v10 8/9] tpm: Added support for TPM emulator

[Valluri, Amarnath]

On Tue, 2017-10-03 at 17:21 -0400, Stefan Berger wrote:
> On 09/29/2017 07:10 AM, Amarnath Valluri wrote:
> > 
> > This change introduces a new TPM backend driver that can
> > communicate with
> > swtpm(software TPM emulator) using unix domain socket interface.
> > QEMU talks to
> > TPM emulator using QEMU's socket-based chardev backend device.
> > 
> > Swtpm uses two Unix sockets for communications, one for plain TPM
> > commands and
> > responses, and one for out-of-band control messages. QEMU passes
> > data socket to
> > be used over the control channel.
> > 
> > The swtpm and associated tools can be found here:
> >      https://github.com/stefanberger/swtpm
> > 
> > The swtpm's control channel protocol specification can be found
> > here:
> >      https://github.com/stefanberger/swtpm/wiki/Control-Channel-Spe
> > cification
> > 
> > Usage:
> >      # setup TPM state directory
> >      mkdir /tmp/mytpm
> >      chown -R tss:root /tmp/mytpm
> >      /usr/bin/swtpm_setup --tpm-state /tmp/mytpm --createek
> To run this, one needs the latest version of swtpm that supports the 
> file descriptor passing.
> Then one can start the swtpm like this:
> 
> swtpm socket --tpmstate dir=/tmp/mytpm --ctrl 
> type=unixio,path=/tmp/swtpm-sock --log level=20
> 
> I tested the SeaBIOS menu items so far and that works fine, also for 
> TPM2 (--tpm2).

Greate, Thanks for you feedback.

- Amarnath