From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753752Ab2LOHAm (ORCPT ); Sat, 15 Dec 2012 02:00:42 -0500 Received: from e28smtp05.in.ibm.com ([122.248.162.5]:56913 "EHLO e28smtp05.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752684Ab2LOHAl (ORCPT ); Sat, 15 Dec 2012 02:00:41 -0500 Message-ID: <50CC2008.1000800@linux.vnet.ibm.com> Date: Sat, 15 Dec 2012 15:00:24 +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 v3 4/5] KVM: x86: let reexecute_instruction work for tdp References: <50CC1F62.4050701@linux.vnet.ibm.com> In-Reply-To: <50CC1F62.4050701@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Content-Scanned: Fidelis XPS MAILER x-cbid: 12121507-8256-0000-0000-0000057302B1 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 nested npt is used, the emulation may be caused by shadow page, it can be fixed by dropping the shadow page Signed-off-by: Xiao Guangrong --- arch/x86/kvm/x86.c | 19 +++++++++++++------ 1 files changed, 13 insertions(+), 6 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index eccd040..bf66169 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4753,17 +4753,24 @@ 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, unsigned long cr2) { - gpa_t gpa; + gpa_t gpa = cr2; pfn_t pfn; + 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 (tdp_enabled) + if (!indirect_shadow_pages) return false; - gpa = kvm_mmu_gva_to_gpa_read(vcpu, gva, NULL); - if (gpa == UNMAPPED_GVA) - return true; /* let cpu generate fault */ + if (!vcpu->arch.mmu.direct_map) { + gpa = kvm_mmu_gva_to_gpa_read(vcpu, cr2, NULL); + if (gpa == UNMAPPED_GVA) + return true; /* let cpu generate fault */ + } /* * if emulation was due to access to shadowed page table -- 1.7.7.6