KVM: x86/mmu: Don't bottom out on leafs when zapping collapsible SPTEs
When zapping collapsible SPTEs in the TDP MMU, don't bottom out on a leaf SPTE now that KVM doesn't require a PFN to compute the host mapping level, i.e. now that there's no need to first find a leaf SPTE and then step back up. Drop the now unused tdp_iter_step_up(), as it is not the safest of helpers (using any of the low level iterators requires some understanding of the various side effects). Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20220715232107.3775620-4-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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