qemu-kvm high cpu usage with idle windows guest

[Micky <mickylmartin@xxxxxxxxx>]

Windows 2k8 R2 guest with updated virtio drivers is idle inside but on
the host qemu-kvm process uses 7-15% cpu.

Things that have been tried without any significant success
- removed tablet device
- manually set cpu topology for cores per socket

Is it just me or the qemu-kvm has little tolerance with windows?
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