The patch titled
KVM: mmu: add missing dirty page tracking cases
has been added to the -mm tree. Its filename is
kvm-mmu-add-missing-dirty-page-tracking-cases.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: KVM: mmu: add missing dirty page tracking cases
From: Avi Kivity <avi@xxxxxxxxxxxx>
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 <avi@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/kvm/paging_tmpl.h | 15 +++++++++++++--
1 files changed, 13 insertions(+), 2 deletions(-)
diff -puN drivers/kvm/paging_tmpl.h~kvm-mmu-add-missing-dirty-page-tracking-cases drivers/kvm/paging_tmpl.h
--- a/drivers/kvm/paging_tmpl.h~kvm-mmu-add-missing-dirty-page-tracking-cases
+++ a/drivers/kvm/paging_tmpl.h
@@ -128,8 +128,10 @@ static int FNAME(walk_addr)(struct guest
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
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 kv
} 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);
_
Patches currently in -mm which might be from avi@xxxxxxxxxxxx are
kvm-mmu-add-missing-dirty-page-tracking-cases.patch
kvm-move-virtualization-deactivation-from-cpu_dead.patch
kvm-cosmetics.patch
kvm-vmx-hack-set_cr0_no_modeswitch-to-actually-do.patch
kvm-use-array_size-macro-instead-of-manual-calculation.patch
kvm-use-page_private-set_page_private-apis.patch
kvm-add-msr-based-hypercall-api.patch
kvm-add-host-hypercall-support-for-vmx.patch
kvm-add-hypercall-host-support-for-svm.patch
kvm-wire-up-hypercall-handlers-to-a-central.patch
kvm-svm-init-cr0-with-the-wp-bit-set.patch
kvm-svm-intercept-smi-to-handle-it-at-host-level.patch
kvm-more-0-null-conversions.patch
-
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