Description of problem:
In debugging this problem:
it was discovered that capabilities XML with 4096 CPUs included will result in XML that is larger than the max allowed RPC message size. If we ever want to support machines with 4096 CPUs, we will need to increase the max RPC size.
Version-Release number of selected component (if applicable):
On machines with 4096 cpus
Steps to Reproduce:
1. Run virsh capabilities
I'm closing this as WONTFIX until we see machines that actually exhibit the problem.