When using with QEMU 
v4.1.0-rc0<http://10.114.102.26/cgit/qemu/tag/?h=v4.1.0-rc0> or newer, the 
patch 
https://libvirt.org/git/?p=libvirt.git;a=commit;h=63acb7bfd56f117309e4fcaf438639d4d7bc7dcb
 cause some windows hyperv features cannot be enabled.

# virsh start win10
error: Failed to start domain win10
error: unsupported configuration: host doesn't support hyperv 'vpindex' feature

  <features>
    <hyperv>
      <relaxed state='on'/>
      <vapic state='on'/>
      <spinlocks state='on' retries='4096'/>
      <vpindex state='on'/>
      <runtime state='on'/>
      <synic state='on'/>
      <reset state='on'/>
      <frequencies state='on'/>
      <reenlightenment state='on'/>
      <tlbflush state='on'/>
      <ipi state='on'/>
      <evmcs state='on'/>
</hyperv>

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