KVM: Cleanup mark_page_dirty

[linux-2.6] / drivers / kvm / kvm_main.c

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 5dc60170278241235d34009b6094b63fcd10c7b3..55639aceca637ccfc295d37c5e9148c7d32c1d23 100644 (file)
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -916,28 +916,18 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
 }
 EXPORT_SYMBOL_GPL(gfn_to_page);
 
+/* WARNING: Does not work on aliased pages. */
 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
 {
-       int i;
        struct kvm_memory_slot *memslot;
-       unsigned long rel_gfn;
 
-       for (i = 0; i < kvm->nmemslots; ++i) {
-               memslot = &kvm->memslots[i];
+       memslot = __gfn_to_memslot(kvm, gfn);
+       if (memslot && memslot->dirty_bitmap) {
+               unsigned long rel_gfn = gfn - memslot->base_gfn;
 
-               if (gfn >= memslot->base_gfn
-                   && gfn < memslot->base_gfn + memslot->npages) {
-
-                       if (!memslot->dirty_bitmap)
-                               return;
-
-                       rel_gfn = gfn - memslot->base_gfn;
-
-                       /* avoid RMW */
-                       if (!test_bit(rel_gfn, memslot->dirty_bitmap))
-                               set_bit(rel_gfn, memslot->dirty_bitmap);
-                       return;
-               }
+               /* avoid RMW */
+               if (!test_bit(rel_gfn, memslot->dirty_bitmap))
+                       set_bit(rel_gfn, memslot->dirty_bitmap);
        }
 }