If your windows guest is with update 1803 or above you might hit this bug:
On Sun, Feb 3, 2019 at 11:28 PM Hetz Ben Hamo <hetz(a)hetz.biz> wrote:
I'm running oVirt 188.8.131.52. I installed Windows 10 pro as a guest, along
with QXL and all the drivers, as well as QEMU guest agent.
While Windows reports a CPU usage of something like 2-4% when idle, oVirt
reports 24-27% CPU usage.
Bug? should I report it?
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