[libvirt] vTPM support in libvirt

I'm wondering if there will be vTPM support in libvirt in the near future?! Xen does support it already with the configuration "vtpm = ['instance=1,backend=0']", for example. So it would be great if the libvirt XML format supported it, too... For example like this: <devices> <vtpm instance="1" backend="xxx" /> </devices> Both attributes are optional. The backend attribute is a VM ID (on Xen, only zero for dom0 is supported) and could be implemented as a UUID?! What do you think? Are there any efforts to introducing that? Cheers Andreas