Just FYI, we had some issues with some Debian VMs for instance, with old kernel
where the VM would suddenly take 100% CPU and would we completely frozen and unresponsive.
It was in fact Debian enabling the suspend, the guest would suspend and trigger a bug in xen PV driver in the guest kernel which would never be able to wake up anymore.
Newer kernel don't have this issue and are able to wake up.
I'm quoting Debian here but it might very well happen on other distro
XCP-ng Team
Developers of XCP-ng
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RE: CPU pegged at 100% in several Rocky Linux 8 VMs without workload in guest