kvm: set page dirty only if page has been writable
In absence of shadow dirty mask, there is no need to set page dirty
if page has never been writable. This is a tiny optimization but
good to have for people who care much about dirty page tracking.
Signed-off-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 70e95d0..1ff4dbb 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -557,8 +557,15 @@
!is_writable_pte(new_spte))
ret = true;
- if (!shadow_accessed_mask)
+ if (!shadow_accessed_mask) {
+ /*
+ * We don't set page dirty when dropping non-writable spte.
+ * So do it now if the new spte is becoming non-writable.
+ */
+ if (ret)
+ kvm_set_pfn_dirty(spte_to_pfn(old_spte));
return ret;
+ }
/*
* Flush TLB when accessed/dirty bits are changed in the page tables,
@@ -605,7 +612,8 @@
if (!shadow_accessed_mask || old_spte & shadow_accessed_mask)
kvm_set_pfn_accessed(pfn);
- if (!shadow_dirty_mask || (old_spte & shadow_dirty_mask))
+ if (old_spte & (shadow_dirty_mask ? shadow_dirty_mask :
+ PT_WRITABLE_MASK))
kvm_set_pfn_dirty(pfn);
return 1;
}