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Subject[PATCH v3 0/7] KVM: MMU: fix release pfn in mmu code
Changlog:
changes from Avi's comments:
- comment for FNAME(fetch)
- add annotations (__acquires, __releases) for page_fault_start and
page_fault_end

changes from Marcelo's comments:
- remove mmu_is_invalid
- make release noslot pfn path more readable

The last patch which introduces page_fault_start and page_fault_end is
controversial, i hope we can try it since it wrap the ugly pfn release
path up, but i respect your idea. :)

Release pfn in the mmu code is little special for we allow no-slot pfn
go to spte walk on page fault path, that means, on page fault fail path,
we can not directly call kvm_release_pfn_clean.

This patchset fixes the bug which release no-slot pfn on fail path and
clean up all the paths where kvm_release_pfn_clean is called



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