From: Avi Kivity <avi@redhat.com>
Date: Wed, 10 Jun 2009 09:56:54 +0000 (+0300)
Subject: KVM: MMU: Fix is_dirty_pte()
X-Git-Tag: v2.6.32-rc1~693^2~160
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=439e218a6f4716da484314fc5a1f0a59b0212c01;p=~emulex%2Finfiniband.git

KVM: MMU: Fix is_dirty_pte()

is_dirty_pte() is used on guest ptes, not shadow ptes, so it needs to avoid
shadow_dirty_mask and use PT_DIRTY_MASK instead.

Misdetecting dirty pages could lead to unnecessarily setting the dirty bit
under EPT.

Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 8ee67e3fb9d..8f2cb29db2f 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -242,7 +242,7 @@ static int is_writeble_pte(unsigned long pte)
 
 static int is_dirty_pte(unsigned long pte)
 {
-	return pte & shadow_dirty_mask;
+	return pte & PT_DIRTY_MASK;
 }
 
 static int is_rmap_pte(u64 pte)