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KVM: Count the number of dirty pages for dirty logging

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Needed for the next patch which uses this number to decide how to write
protect a slot.

Signed-off-by: Takuya Yoshikawa <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
This commit is contained in:
Takuya Yoshikawa 2011-11-14 18:23:34 +09:00 • committed by Avi Kivity
commit 7850ac5420
3 changed files with 7 additions and 7 deletions
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4
virt/kvm/kvm_main.c
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@ -625,6 +625,7 @@ static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
return -ENOMEM;
memslot->dirty_bitmap_head = memslot->dirty_bitmap;
memslot->nr_dirty_pages = 0;
return 0;
}
#endif /* !CONFIG_S390 */
@ -1491,7 +1492,8 @@ void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
if (memslot && memslot->dirty_bitmap) {
unsigned long rel_gfn = gfn - memslot->base_gfn;
__set_bit_le(rel_gfn, memslot->dirty_bitmap);
if (!__test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap))
memslot->nr_dirty_pages++;
}
}