From 7850ac5420803996e2960d15b924021f28e0dffc Mon Sep 17 00:00:00 2001 From: Takuya Yoshikawa Date: Mon, 14 Nov 2011 18:23:34 +0900 Subject: 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 Signed-off-by: Avi Kivity --- virt/kvm/kvm_main.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'virt') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 4c5b9a23967..af5c988cafc 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -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++; } } -- cgit v1.2.3