From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: [PATCH v5 1/9] KVM: MMU: fix forgot reserved bits check in speculative path Date: Tue, 06 Jul 2010 18:44:40 +0800 Message-ID: <4C330918.6040709@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , LKML , KVM list To: Avi Kivity Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:55776 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1751590Ab0GFKse (ORCPT ); Tue, 6 Jul 2010 06:48:34 -0400 Sender: kvm-owner@vger.kernel.org List-ID: In the speculative path, we should check guest pte's reserved bits just as the real processor does Reported-by: Marcelo Tosatti Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 3 +++ arch/x86/kvm/paging_tmpl.h | 3 ++- 2 files changed, 5 insertions(+), 1 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 104756b..3dcd55d 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2781,6 +2781,9 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, break; } + if (is_rsvd_bits_set(vcpu, gentry, PT_PAGE_TABLE_LEVEL)) + gentry = 0; + mmu_guess_page_from_pte_write(vcpu, gpa, gentry); spin_lock(&vcpu->kvm->mmu_lock); if (atomic_read(&vcpu->kvm->arch.invlpg_counter) != invlpg_counter) diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index dfb2720..19f0077 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -628,7 +628,8 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp, pte_gpa = first_pte_gpa + i * sizeof(pt_element_t); if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte, - sizeof(pt_element_t))) + sizeof(pt_element_t)) || + is_rsvd_bits_set(vcpu, gpte, PT_PAGE_TABLE_LEVEL)) return -EINVAL; gfn = gpte_to_gfn(gpte); -- 1.6.1.2