[PATCH 36/50] KVM: MMU: When updating the dirty bit, inform the mmu about it

[Avi Kivity]

Since the mmu uses different shadow pages for dirty large pages and clean
large pages, this allows the mmu to drop ptes that are now invalid.

Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
---
 drivers/kvm/paging_tmpl.h |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h
index a0f84a5..a9e687b 100644
--- a/drivers/kvm/paging_tmpl.h
+++ b/drivers/kvm/paging_tmpl.h
@@ -74,9 +74,14 @@ static void FNAME(update_dirty_bit)(struct kvm_vcpu *vcpu,
 				    pt_element_t *ptep,
 				    gfn_t table_gfn)
 {
+	gpa_t pte_gpa;
+
 	if (write_fault && !is_dirty_pte(*ptep)) {
 		mark_page_dirty(vcpu->kvm, table_gfn);
 		*ptep |= PT_DIRTY_MASK;
+		pte_gpa = ((gpa_t)table_gfn << PAGE_SHIFT);
+		pte_gpa += offset_in_page(ptep);
+		kvm_mmu_pte_write(vcpu, pte_gpa, (u8 *)ptep, sizeof(*ptep));
 	}
 }
 
-- 
1.5.3.7

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