Description of problem: "virt-top --help" and "man virt-top" offer no information on how to connect to a kvm or qemu session. There's a "see-also" that points to virsh, which does have the information; but it would be convenient for new users with kvm if they didn't have to hunt so hard for the syntax to make virt-top usable.
This is now fixed upstream in this cset: http://hg.et.redhat.com/virt/applications/virt-top--devel?cs=3023594b16f0 and this fix will therefore be included in the next release of virt-top in Rawhide.