From: Bandan Das <bsd@redhat.com>
Date: Tue, 12 Jul 2016 22:18:48 +0000 (-0400)
Subject: kvm: mmu: extend the is_present check to 32 bits
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=8d5cf1610da526c3c1286bd7b3ac9f35f96ed43d;p=openwrt%2Fstaging%2Fblogic.git

kvm: mmu: extend the is_present check to 32 bits

This is safe because this function is called
on host controlled page table and non-present/non-MMIO
sptes never use bits 1..31. For the EPT case, this
ensures that cases where only the execute bit is set
is marked valid.

Signed-off-by: Bandan Das <bsd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 837bf23c5b06..55a20c0524fe 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -304,7 +304,7 @@ static int is_nx(struct kvm_vcpu *vcpu)
 
 static int is_shadow_present_pte(u64 pte)
 {
-	return pte & PT_PRESENT_MASK && !is_mmio_spte(pte);
+	return (pte & 0xFFFFFFFFull) && !is_mmio_spte(pte);
 }
 
 static int is_large_pte(u64 pte)