From bf3f8e86c2e22b9bd1375be1bbbd67384dba4342 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Mon, 19 Feb 2007 14:37:46 +0200 Subject: [PATCH] KVM: mmu: add missing dirty page tracking cases We fail to mark a page dirty in three cases: - setting the accessed bit in a pte - setting the dirty bit in a pte - emulating a write into a pagetable This fix adds the missing cases. Signed-off-by: Avi Kivity --- drivers/kvm/paging_tmpl.h | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h index b6b90e9..6507ccb 100644 --- a/drivers/kvm/paging_tmpl.h +++ b/drivers/kvm/paging_tmpl.h @@ -128,8 +128,10 @@ static int FNAME(walk_addr)(struct guest_walker *walker, goto access_error; #endif - if (!(*ptep & PT_ACCESSED_MASK)) - *ptep |= PT_ACCESSED_MASK; /* avoid rmw */ + if (!(*ptep & PT_ACCESSED_MASK)) { + mark_page_dirty(vcpu->kvm, table_gfn); + *ptep |= PT_ACCESSED_MASK; + } if (walker->level == PT_PAGE_TABLE_LEVEL) { walker->gfn = (*ptep & PT_BASE_ADDR_MASK) @@ -185,6 +187,12 @@ static void FNAME(release_walker)(struct guest_walker *walker) kunmap_atomic(walker->table, KM_USER0); } +static void FNAME(mark_pagetable_dirty)(struct kvm *kvm, + struct guest_walker *walker) +{ + mark_page_dirty(kvm, walker->table_gfn[walker->level - 1]); +} + static void FNAME(set_pte)(struct kvm_vcpu *vcpu, u64 guest_pte, u64 *shadow_pte, u64 access_bits, gfn_t gfn) { @@ -348,12 +356,15 @@ static int FNAME(fix_write_pf)(struct kvm_vcpu *vcpu, } else if (kvm_mmu_lookup_page(vcpu, gfn)) { pgprintk("%s: found shadow page for %lx, marking ro\n", __FUNCTION__, gfn); + mark_page_dirty(vcpu->kvm, gfn); + FNAME(mark_pagetable_dirty)(vcpu->kvm, walker); *guest_ent |= PT_DIRTY_MASK; *write_pt = 1; return 0; } mark_page_dirty(vcpu->kvm, gfn); *shadow_ent |= PT_WRITABLE_MASK; + FNAME(mark_pagetable_dirty)(vcpu->kvm, walker); *guest_ent |= PT_DIRTY_MASK; rmap_add(vcpu, shadow_ent); -- 2.7.4