On Fri, Feb 07, 2025, Yan Zhao wrote: > Make sure pfn is not changed for a spurious fault by warning in the TDP > MMU. For shadow path, only treat a prefetch fault as spurious when pfn is > not changed, since the rmap removal and add are required when pfn is > changed. I like sanity checks, but I don't like special casing "prefetch" faults like this. KVM should _never_ change the PFN of a shadow-present SPTE. The TDP MMU already BUG()s on this, and mmu_spte_update() WARNs on the transition.
