From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo Tosatti Subject: [patch 3/5] KVM: MMU: add kvm_mmu_get_spte_hierarchy helper Date: Thu, 11 Jun 2009 12:07:42 -0300 Message-ID: <20090611150845.842354911@localhost.localdomain> References: <20090611150739.140947079@localhost.localdomain> Cc: kvm@vger.kernel.org, Marcelo Tosatti To: avi@redhat.com Return-path: Received: from mx2.redhat.com ([66.187.237.31]:49746 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756659AbZFKPOn (ORCPT ); Thu, 11 Jun 2009 11:14:43 -0400 Received: from int-mx2.corp.redhat.com (int-mx2.corp.redhat.com [172.16.27.26]) by mx2.redhat.com (8.13.8/8.13.8) with ESMTP id n5BFEkEe014144 for ; Thu, 11 Jun 2009 11:14:46 -0400 In-Reply-To: <4A311529.3070907@redhat.com> Content-Disposition: inline; filename=kvm_mmu_walk_shadow Sender: kvm-owner@vger.kernel.org List-ID: Required by EPT misconfiguration handler. Signed-off-by: Marcelo Tosatti Index: kvm/arch/x86/kvm/mmu.c =================================================================== --- kvm.orig/arch/x86/kvm/mmu.c +++ kvm/arch/x86/kvm/mmu.c @@ -3013,6 +3013,24 @@ out: return r; } +int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]) +{ + struct kvm_shadow_walk_iterator iterator; + int nr_sptes = 0; + + spin_lock(&vcpu->kvm->mmu_lock); + for_each_shadow_entry(vcpu, addr, iterator) { + sptes[iterator.level-1] = *iterator.sptep; + nr_sptes++; + if (!is_shadow_present_pte(*iterator.sptep)) + break; + } + spin_unlock(&vcpu->kvm->mmu_lock); + + return nr_sptes; +} +EXPORT_SYMBOL_GPL(kvm_mmu_get_spte_hierarchy); + #ifdef AUDIT static const char *audit_msg; Index: kvm/arch/x86/kvm/mmu.h =================================================================== --- kvm.orig/arch/x86/kvm/mmu.h +++ kvm/arch/x86/kvm/mmu.h @@ -37,6 +37,8 @@ #define PT32_ROOT_LEVEL 2 #define PT32E_ROOT_LEVEL 3 +int kvm_mmu_get_spte_hierarchy(struct kvm_vcpu *vcpu, u64 addr, u64 sptes[4]); + static inline void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu) { if (unlikely(vcpu->kvm->arch.n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES)) --