[PATCH v4 08/30] KVM: x86/mmu: Check for !leaf=>leaf, not PFN change, in TDP MMU SP removal

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From: Sean Christopherson <seanjc@xxxxxxxxxx>

Look for a !leaf=>leaf conversion instead of a PFN change when checking
if a SPTE change removed a TDP MMU shadow page.  Convert the PFN check
into a WARN, as KVM should never change the PFN of a shadow page (except
when its being zapped or replaced).


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