[libvirt-users] Differentiating Disk access from different VMs

All, I have a specific use case where I want to be ale look at vfs or blk_io requests on the host machine and differentiate which VMs the access is originating from. I am assuming a Disk backend, and looking for virsh command or libvirt API that can help me do so. I have tried quite a bit to Google-fu this problem; no such luck. Would love to know if there is some cute trick to do so. Thanks. Affan