Removing a Large Number of CPUs From a Domain Might Fail

You might see the following error message when you attempt to remove a large number of CPUs from a guest domain:

Request to remove cpu(s) sent, but no valid response received
VCPU(s) will remain allocated to the domain, but might
not be available to the guest OS
Resource modification failed

To avoid this issue, remove fewer than 100 CPUs at a time from the domain.