On Fri, Mar 31, 2017 at 04:10:09PM +0300, Amarnath Valluri wrote: > Briefly, Theses set of patches introduces: > - new TPM backend driver to support software TPM emulators(swtpm(1)). > - and few supported fixes/enhancements/cleanup to existing tpm backend code. > > The similar idea was initiated earliar(2) by Stefan Berger(CCed) with slightly > different approach, using CUSE. As swtpm has excellent support for unix domain > sockets, hence this implementation uses unix domain sockets to communicate > with > swtpm. > > When Qemu is configured with 'emulator' tpm backend, it spawns 'swtpm' and > communicates its via Unix domain sockets.
I'm not convinced that having QEMU spawning swtpm itself is a desirable approach, as it means QEMU needs to have all the privileges that swtpm will need, so that swtpm can inherit them. At the very least I think we need to have a way to disable this spawning, so it can connect to a pre-existing swtpm process that's been spawned ahead of time. This will let us have stricter privilege separation. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://entangle-photo.org -o- http://search.cpan.org/~danberr/ :|
