From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755303Ab2IUG5c (ORCPT ); Fri, 21 Sep 2012 02:57:32 -0400 Received: from e28smtp05.in.ibm.com ([122.248.162.5]:35250 "EHLO e28smtp05.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754751Ab2IUG5a (ORCPT ); Fri, 21 Sep 2012 02:57:30 -0400 Message-ID: <505C0FCF.2070308@linux.vnet.ibm.com> Date: Fri, 21 Sep 2012 14:57:19 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120827 Thunderbird/15.0 MIME-Version: 1.0 To: Xiao Guangrong CC: Avi Kivity , Marcelo Tosatti , LKML , KVM Subject: [PATCH v3 1/7] KVM: MMU: fix release noslot pfn References: <505C0FA8.5070007@linux.vnet.ibm.com> In-Reply-To: <505C0FA8.5070007@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit x-cbid: 12092106-8256-0000-0000-00000443ED7E Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We can not directly call kvm_release_pfn_clean to release the pfn since we can meet noslot pfn which is used to cache mmio info into spte Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 6 ++++-- arch/x86/kvm/paging_tmpl.h | 6 ++++-- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index aa0b469..0f56169 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2877,7 +2877,8 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, u32 error_code, out_unlock: spin_unlock(&vcpu->kvm->mmu_lock); - kvm_release_pfn_clean(pfn); + if (likely(!is_noslot_pfn(pfn))) + kvm_release_pfn_clean(pfn); return 0; } @@ -3345,7 +3346,8 @@ static int tdp_page_fault(struct kvm_vcpu *vcpu, gva_t gpa, u32 error_code, out_unlock: spin_unlock(&vcpu->kvm->mmu_lock); - kvm_release_pfn_clean(pfn); + if (likely(!is_noslot_pfn(pfn))) + kvm_release_pfn_clean(pfn); return 0; } diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index bf8c42b..9ce6bc0 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -544,7 +544,8 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr, out_gpte_changed: if (sp) kvm_mmu_put_page(sp, it.sptep); - kvm_release_pfn_clean(pfn); + if (likely(!is_noslot_pfn(pfn))) + kvm_release_pfn_clean(pfn); return NULL; } @@ -645,7 +646,8 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code, out_unlock: spin_unlock(&vcpu->kvm->mmu_lock); - kvm_release_pfn_clean(pfn); + if (likely(!is_noslot_pfn(pfn))) + kvm_release_pfn_clean(pfn); return 0; } -- 1.7.7.6