If this is the issue I think it is, the unraid folks bisected this and found the culprit as:
aca6ff2 KVM: dynamic halt-polling ( https://github.com/torvalds/linux/commit/aca6ff29c4063a8d467cdee241e6b3bf7dc4a171 ) It seems to be a poor interaction of the halt polling interval vs the timer ticks on win10. You can pick a different polling interval with the kvm module option halt_poll_ns. The default is 500000. It seemed that setting this to 400000 or lower resolves the issue. You can do this via a modprobe entry, 'options kvm halt_poll_ns=400000' or on the kernel command line with kvm.halt_poll_ns=400000. You can also change it dynamically via 'echo 400000 > /sys/module/kvm/parameters/halt_poll_ns'
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