forked from Minki/linux
Optimize TLB flush in kvm_mmu_slot_remove_write_access.
No TLB flush is needed when there's no valid rmap in memory slot. Signed-off-by: Kai Huang <kai.huang@linux.intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -4302,6 +4302,7 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
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struct kvm_memory_slot *memslot;
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gfn_t last_gfn;
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int i;
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bool flush = false;
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memslot = id_to_memslot(kvm->memslots, slot);
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last_gfn = memslot->base_gfn + memslot->npages - 1;
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@ -4318,7 +4319,8 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
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for (index = 0; index <= last_index; ++index, ++rmapp) {
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if (*rmapp)
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__rmap_write_protect(kvm, rmapp, false);
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flush |= __rmap_write_protect(kvm, rmapp,
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false);
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if (need_resched() || spin_needbreak(&kvm->mmu_lock))
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cond_resched_lock(&kvm->mmu_lock);
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@ -4345,7 +4347,8 @@ void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
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* instead of PT_WRITABLE_MASK, that means it does not depend
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* on PT_WRITABLE_MASK anymore.
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*/
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kvm_flush_remote_tlbs(kvm);
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if (flush)
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kvm_flush_remote_tlbs(kvm);
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}
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#define BATCH_ZAP_PAGES 10
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