From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759640Ab2IGGNm (ORCPT ); Fri, 7 Sep 2012 02:13:42 -0400 Received: from e23smtp04.au.ibm.com ([202.81.31.146]:57573 "EHLO e23smtp04.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753306Ab2IGGNk (ORCPT ); Fri, 7 Sep 2012 02:13:40 -0400 Message-ID: <5049908A.7070501@linux.vnet.ibm.com> Date: Fri, 07 Sep 2012 14:13:30 +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: Avi Kivity CC: Marcelo Tosatti , LKML , KVM Subject: [PATCH 1/3] KVM: MMU: release noslot pfn on the fail path properly Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit x-cbid: 12090706-9264-0000-0000-0000024A0AAA 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 Introduce mmu_release_pfn_clean to do this kind of thing Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 19 ++++++++++++++----- arch/x86/kvm/paging_tmpl.h | 4 ++-- 2 files changed, 16 insertions(+), 7 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 399c177..3c10bca 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2432,6 +2432,16 @@ done: return ret; } +/* + * The primary user is page fault path which call it to properly + * release noslot_pfn. + */ +static void mmu_release_pfn_clean(pfn_t pfn) +{ + if (!is_error_pfn(pfn)) + kvm_release_pfn_clean(pfn); +} + static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, unsigned pt_access, unsigned pte_access, int user_fault, int write_fault, @@ -2497,8 +2507,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, } } - if (!is_error_pfn(pfn)) - kvm_release_pfn_clean(pfn); + mmu_release_pfn_clean(pfn); } static void nonpaging_new_cr3(struct kvm_vcpu *vcpu) @@ -2618,7 +2627,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write, 1, ACC_ALL, iterator.sptep); if (!sp) { pgprintk("nonpaging_map: ENOMEM\n"); - kvm_release_pfn_clean(pfn); + mmu_release_pfn_clean(pfn); return -ENOMEM; } @@ -2882,7 +2891,7 @@ 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); + mmu_release_pfn_clean(pfn); return 0; } @@ -3350,7 +3359,7 @@ 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); + mmu_release_pfn_clean(pfn); return 0; } diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index bf8c42b..f075259 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -544,7 +544,7 @@ 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); + mmu_release_pfn_clean(pfn); return NULL; } @@ -645,7 +645,7 @@ 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); + mmu_release_pfn_clean(pfn); return 0; } -- 1.7.7.6