KVM: Move guest pte dirty bit management to the guest pagetable walker

This is more consistent with the accessed bit management, and makes the dirty
bit available earlier for other purposes.

Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index d046ba80776..e6616a6c9ce 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -199,6 +199,11 @@ static int is_writeble_pte(unsigned long pte)
 	return pte & PT_WRITABLE_MASK;
 }
 
+static int is_dirty_pte(unsigned long pte)
+{
+	return pte & PT_DIRTY_MASK;
+}
+
 static int is_io_pte(unsigned long pte)
 {
 	return pte & PT_SHADOW_IO_MARK;