From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755136Ab3AMPrm (ORCPT ); Sun, 13 Jan 2013 10:47:42 -0500 Received: from e23smtp03.au.ibm.com ([202.81.31.145]:56981 "EHLO e23smtp03.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754882Ab3AMPrl (ORCPT ); Sun, 13 Jan 2013 10:47:41 -0500 Message-ID: <50F2D6EC.6030409@linux.vnet.ibm.com> Date: Sun, 13 Jan 2013 23:46:52 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120911 Thunderbird/15.0.1 MIME-Version: 1.0 To: Xiao Guangrong CC: Marcelo Tosatti , Gleb Natapov , LKML , KVM Subject: [PATCH v6 2/3] KVM: x86: let reexecute_instruction work for tdp References: <50F2D64C.4030804@linux.vnet.ibm.com> In-Reply-To: <50F2D64C.4030804@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13011315-6102-0000-0000-000002D8272A Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, reexecute_instruction refused to retry all instructions if tdp is enabled. If nested npt is used, the emulation may be caused by shadow page, it can be fixed by dropping the shadow page. And the only condition that tdp can not retry the instruction is the access fault on error pfn Signed-off-by: Xiao Guangrong --- arch/x86/kvm/x86.c | 61 ++++++++++++++++++++++++++++++++++++--------------- 1 files changed, 43 insertions(+), 18 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 08cacd9..6f13e03 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4753,25 +4753,25 @@ static int handle_emulation_failure(struct kvm_vcpu *vcpu) return r; } -static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva) +static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t cr2) { - gpa_t gpa; + gpa_t gpa = cr2; pfn_t pfn; - if (tdp_enabled) - return false; - - gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL); - if (gpa == UNMAPPED_GVA) - return true; /* let cpu generate fault */ + if (!vcpu->arch.mmu.direct_map) { + /* + * Write permission should be allowed since only + * write access need to be emulated. + */ + gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL); - /* - * if emulation was due to access to shadowed page table - * and it failed try to unshadow page and re-enter the - * guest to let CPU execute the instruction. - */ - if (kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa))) - return true; + /* + * If the mapping is invalid in guest, let cpu retry + * it to generate fault. + */ + if (gpa == UNMAPPED_GVA) + return true; + } /* * Do not retry the unhandleable instruction if it faults on the @@ -4780,12 +4780,37 @@ static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva) * instruction -> ... */ pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa)); - if (!is_error_noslot_pfn(pfn)) { - kvm_release_pfn_clean(pfn); + + /* + * If the instruction failed on the error pfn, it can not be fixed, + * report the error to userspace. + */ + if (is_error_noslot_pfn(pfn)) + return false; + + kvm_release_pfn_clean(pfn); + + /* The instructions are well-emulated on direct mmu. */ + if (vcpu->arch.mmu.direct_map) { + unsigned int indirect_shadow_pages; + + spin_lock(&vcpu->kvm->mmu_lock); + indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages; + spin_unlock(&vcpu->kvm->mmu_lock); + + if (indirect_shadow_pages) + kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); + return true; } - return false; + /* + * if emulation was due to access to shadowed page table + * and it failed try to unshadow page and re-enter the + * guest to let CPU execute the instruction. + */ + kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa)); + return true; } static bool retry_instruction(struct x86_emulate_ctxt *ctxt, -- 1.7.7.6