From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bandan Das Subject: [PATCH v2 1/5] mmu: extend the is_present check to 32 bits Date: Tue, 12 Jul 2016 18:18:48 -0400 Message-ID: <1468361932-16580-2-git-send-email-bsd@redhat.com> References: <1468361932-16580-1-git-send-email-bsd@redhat.com> Cc: pbonzini@redhat.com, guangrong.xiao@linux.intel.com, kernellwp@gmail.com, linux-kernel@vger.kernel.org To: kvm@vger.kernel.org Return-path: In-Reply-To: <1468361932-16580-1-git-send-email-bsd@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org 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 --- arch/x86/kvm/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index def97b3..87b62dc 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) -- 2.5.5