can hotplug vcpus to running Windows 10 guest, but not unplug

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Hi,

i'm playing a bit around with vcpus.
My guest is Windows 10 1903.
This is the excerpt from the config:
 ...
 <vcpu placement='static' current='2'>4</vcpu>
  <vcpus>
    <vcpu id='0' enabled='yes' hotpluggable='no'/>
    <vcpu id='1' enabled='yes' hotpluggable='yes'/>
    <vcpu id='2' enabled='no' hotpluggable='yes'/>
    <vcpu id='3' enabled='no' hotpluggable='yes'/>
  </vcpus>
 ...

I'm able to hotplug vcpus, but when i want to unplug them i get the following:

virsh # setvcpus pathway 3 --live
virsh # setvcpus pathway 4 --live
virsh # setvcpus pathway 2 --live
error: internal error: unable to execute QEMU command 'device_del': acpi: device unplug request for not supported device type: qemu64-x86_64-cpu

Does anyone know why it can't be unplugged ?

Thanks.


Brtnf

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