Is it possible to configure EPT Entries or VMCS such that whenever a guest frees a page
the host can instantaneously become aware of this. I have checked out the intel software developer
manual 3B. But the closest I could get is by causing a write violation in the EPT paging structure.
But again, it did not seem proper as such writing violation can arise because of many other reasons
as well. Besides, the whole performance of EPT would be destroyed if the guest does cache-writethrough.
I was testing this stuff with KVM and I could see that the host is not aware of deallocations that take
place in the guest after allocations.