KVM: Count the number of dirty pages for dirty logging

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

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index c6a2ec925846..7c654aa46b6c 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -181,6 +181,7 @@ struct kvm_memory_slot {
         unsigned long *rmap;
         unsigned long *dirty_bitmap;
         unsigned long *dirty_bitmap_head;
+        unsigned long nr_dirty_pages;
         struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
         unsigned long userspace_addr;
         int user_alloc;