From c4fcc2724628c6548748ec80a90b548fc300e81f Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Thu, 11 Oct 2007 15:30:21 +0200 Subject: [PATCH] KVM: MMU: When updating the dirty bit, inform the mmu about it 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 --- drivers/kvm/paging_tmpl.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h index a0f84a5379a4..a9e687b5c1e9 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)); } } -- GitLab