Re: [Qemu-devel] [PATCH v4 8/8] tpm: Added support for TPM emulator

["Valluri, Amarnath" <amarnath.valluri@intel.com>]

On Wed, 2017-05-24 at 11:15 -0400, Stefan Berger wrote:
> On 05/16/2017 03:58 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.
> > 
> > Swtpm uses two unix sockets, one for plain TPM commands and
> > responses, and one
> > for out-of-band control messages.
> > 
> > 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
> > 
> >      # Ask qemu to use TPM emulator with given tpm state directory
> >      qemu-system-x86_64 \
> >          [...] \
> >          -tpmdev
> > emulator,id=tpm0,tpmstatedir=/tmp/mytpm,logfile=/tmp/swtpm.log \
> >          -device tpm-tis,tpmdev=tpm0 \
> >          [...]
> > 
> > Signed-off-by: Amarnath Valluri <amarnath.valluri@intel.com>
> Since you are not supporting migration in this patch, you probably
> have 
> to add a migrate_add_blocker() call somewhere along the lines of this
> here:
> 
> https://github.com/stefanberger/qemu-tpm/commit/27d332dc3b2c6bfd0fcd3
> 8e69f5c899651f3a5d8#diff-3a0192eef5d20837af490c32bf396f4eR641
> 
I need to dig a bit and femiliarize myself about 'migration' support, I
guess i can send it as a separate patch ?

- Amarnath