On Sun, Aug 07, 2016 at 14:43:27 -0500, David Ashley wrote:

All -

What is the proper XML to supply to the Python Connections compareCPU method?

The same XML which can be used in domain XML to describe guest CPU configuration, i.e., http://libvirt.org/formatdomain.html#elementsCPU

I have looked at the cpu_map.xml file and I believe I have the

cpu_map.xml is an internal data file and its structure is completely irrelevant.

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>')

<cpu mode='custom' match='exact'> <model fallback='forbid'>kvm64</model> </cpu>

if retc == -1: print("CPUs are not the same.") else: print("CPUs are the same.")

This won't work either. The documentation of this APIs clearly says the function returns one of VIR_CPU_COMPARE_* values, where -1 is used for errors and the result of the comparison (if there was no error) is either 0, 1, or 2. So even if the result is != -1, the CPUs may still be incompatible. In other words the return values are -1 error 0 incompatible CPUs 1 identical CPUs 2 host CPU is better than the CPU described by XML However, if you want to treat incompatible CPUs as a failure, you can use VIR_CONNECT_COMPARE_CPU_FAIL_INCOMPATIBLE flag and than your check for retc == -1 will work. Jirka