While playing with CPU hotplug I noticed that if a guest fails to unplug
a VCPU the toolstack will mark VCPU's availability in xenstore as
"offline" even though that VCPU is still running in the guest.
It's easy to see this by doing 'xl vcpu-set <domid> 0', which is
presumably not a realistic scenario but we can get into the same
situation if, for example, the guest is configured without hotplug
support or some operations during unplug fail.
Should we at least document this behavior (that 'availability' entry in
xenstore is unreliable) somewhere?
-boris
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