From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Guangrong Subject: [PATCH 3/5] KVM MMU: fix for got gfn when sync shadow pages Date: Thu, 13 May 2010 10:08:08 +0800 Message-ID: <4BEB5F08.3010604@cn.fujitsu.com> References: <4BEB5E8A.7030606@cn.fujitsu.com> <4BEB5EC4.6070802@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Marcelo Tosatti , KVM list , LKML To: Avi Kivity Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:49789 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1754266Ab0EMCLV (ORCPT ); Wed, 12 May 2010 22:11:21 -0400 In-Reply-To: <4BEB5EC4.6070802@cn.fujitsu.com> Sender: kvm-owner@vger.kernel.org List-ID: sp->gfns[] are not mapping gfn since it has cooked by unalias_gfn() Signed-off-by: Xiao Guangrong --- arch/x86/kvm/paging_tmpl.h | 7 ++++--- 1 files changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 11d8a16..71c73fe 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -588,7 +588,7 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) unsigned pte_access; pt_element_t gpte; gpa_t pte_gpa; - gfn_t gfn = sp->gfns[i]; + gfn_t gfn; if (!is_shadow_present_pte(sp->spt[i])) continue; @@ -599,8 +599,9 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) sizeof(pt_element_t))) return -EINVAL; - if (gpte_to_gfn(gpte) != gfn || !is_present_gpte(gpte) || - !(gpte & PT_ACCESSED_MASK)) { + gfn = gpte_to_gfn(gpte); + if (unalias_gfn(vcpu->kvm, gfn) != sp->gfns[i] || + !is_present_gpte(gpte) || !(gpte & PT_ACCESSED_MASK)) { u64 nonpresent; rmap_remove(vcpu->kvm, &sp->spt[i]); -- 1.6.1.2