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KVM: Write protect the updated slot only when dirty logging is enabled

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Calling kvm_mmu_slot_remove_write_access() for a deleted slot does
nothing but search for non-existent mmu pages which have mappings to
that deleted memory; this is safe but a waste of time.

Since we want to make the function rmap based in a later patch, in a
manner which makes it unsafe to be called for a deleted slot, we makes
the caller see if the slot is non-zero and being dirty logged.

Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Takuya Yoshikawa
2013-01-08 19:43:28 +09:00
committed by Gleb Natapov
parent aa11e3a8a6
commit c972f3b125
2 changed files with 7 additions and 2 deletions
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virt/kvm/kvm_main.c
-1
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@@ -817,7 +817,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
if (kvm_create_dirty_bitmap(&new) < 0)
goto out_free;
/* destroy any largepage mappings for dirty tracking */
}
if (!npages || base_gfn != old.base_gfn) {