[libvirt] [Openstack][Openstack-dev]Where is libvirt library packages in Openstack Nova branch

Hi all, I read the source code of Openstack Nova branch source codes but i can not find the standard libvirt library packages, which i think Nova uses libvirt interfaces they are from standard libvirt library to attach Sheepdog(or others) volumes to QEMU. If i add a new block storage driver for standard libvirt, i have to update these libvirt library packages in Openstack Nova brahch. Cloud anyone give me some suggestions? Thanks in advance ;-) -- Thanks Harry Wei