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

Marc Roos M.Roos at
Fri Feb 14 23:47:01 UTC 2020

Would you mind sharing your xml? I have strange high host load on idle 
windows guest/domain


-----Original Message-----
Sent: 14 February 2020 16:05
To: libvirt-ML
Subject: can hotplug vcpus to running Windows 10 guest, but not unplug


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>
    <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'/>

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

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: 

Does anyone know why it can't be unplugged ?




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