All - What is the proper XML to supply to the Python Connections compareCPU method? I have looked at the cpu_map.xml file and I believe I have the proper XML configured but the method always throws an exception with a missing CPU architecture error. Here is the code. from __future__ import print_function import sys import libvirt conn = libvirt.open('qemu:///system') if conn == None: print('Failed to open connection to qemu:///system', file=sys.stderr) exit(1) retc = conn.compareCPU('<cpu><arch name="x86"><model name="kvm64"/></arch></cpu>') if retc == -1: print("CPUs are not the same.") else: print("CPUs are the same.") conn.close() exit(0) This probably just a simple error on my part but I have tried more that a few permutations of the XML with no success. So I guess I need some help with this. Thanks, David Ashley