Why Linux inside KVM gets busy after I put the host to suspend-to-ram?

I run another Linux instance inside KVM on my laptop.

When I suspend-to-ram the laptop and wake it up again, the guest Linux starts consuming 100% CPU for some time (maybe proportional to the sleep time) and becomes completely irresponsive. After it finally unstucks itself, I see BUG: soft lockup - CPU#0 stuck for 22s.

Why does it happen? How do I prevent this?