KVM: x86/mmu: Check for a REMOVED leaf SPTE before making the SPTE
Explicitly check for a REMOVED leaf SPTE prior to attempting to map the final SPTE when handling a TDP MMU fault. Functionally, this is a nop as tdp_mmu_set_spte_atomic() will eventually detect the frozen SPTE. Pre-checking for a REMOVED SPTE is a minor optmization, but the real goal is to allow tdp_mmu_set_spte_atomic() to have an invariant that the "old" SPTE is never a REMOVED SPTE. Signed-off-by: Sean Christopherson <seanjc@google.com> Reviewed-by: Ben Gardon <bgardon@google.com> Message-Id: <20220226001546.360188-24-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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