Allow KVM/Qemu to use Hyper-V enlightenment settings
Problem:
Slow performance for Windows Servers in KVM/QEMU environments
Solution:
Enable KVM to emulate the Hyper-V settings and allow the guest VMs to take advantage.
sudo virt-xml $VMNAME --edit --features hyperv_relaxed=on,hyperv_vapic=on,hyperv_spinlocks=on,hyperv_spinlocks_retries=8191 sudo virt-xml $VMNAME --edit --clock hypervclock_present=yes