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Shutemov" Subject: Re: [RFC PATCH v12 18/33] KVM: x86/mmu: Handle page fault for private memory Message-ID: Reply-To: Yan Zhao References: <20230914015531.1419405-1-seanjc@google.com> <20230914015531.1419405-19-seanjc@google.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20230914015531.1419405-19-seanjc@google.com> X-ClientProxiedBy: SI2PR02CA0050.apcprd02.prod.outlook.com (2603:1096:4:196::11) To DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR11MB5966:EE_|BN9PR11MB5242:EE_ X-MS-Office365-Filtering-Correlation-Id: 2565bab3-13d1-47da-6156-08dbb5b21f53 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS7PR11MB5966.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230031)(136003)(396003)(346002)(39860400002)(366004)(376002)(451199024)(1800799009)(186009)(6506007)(6486002)(7416002)(7406005)(6512007)(2906002)(26005)(66556008)(3450700001)(5660300002)(38100700002)(66476007)(316002)(8676002)(4326008)(41300700001)(8936002)(6916009)(54906003)(66946007)(82960400001)(6666004)(478600001)(86362001)(83380400001);DIR:OUT;SFP:1102; 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> +} > + > +static int kvm_faultin_pfn_private(struct kvm_vcpu *vcpu, > + struct kvm_page_fault *fault) > +{ > + int max_order, r; > + > + if (!kvm_slot_can_be_private(fault->slot)) { > + kvm_mmu_prepare_memory_fault_exit(vcpu, fault); > + return -EFAULT; > + } > + > + r = kvm_gmem_get_pfn(vcpu->kvm, fault->slot, fault->gfn, &fault->pfn, > + &max_order); > + if (r) { > + kvm_mmu_prepare_memory_fault_exit(vcpu, fault); > + return r; > + } > + > + fault->max_level = min(kvm_max_level_for_order(max_order), > + fault->max_level); > + fault->map_writable = !(fault->slot->flags & KVM_MEM_READONLY); > + > + return RET_PF_CONTINUE; > +} > + > static int __kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault) > { > struct kvm_memory_slot *slot = fault->slot; > @@ -4293,6 +4356,14 @@ static int __kvm_faultin_pfn(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault > return RET_PF_EMULATE; > } > > + if (fault->is_private != kvm_mem_is_private(vcpu->kvm, fault->gfn)) { In patch 21, fault->is_private is set as: ".is_private = kvm_mem_is_private(vcpu->kvm, cr2_or_gpa >> PAGE_SHIFT)", then, the inequality here means memory attribute has been updated after last check. So, why an exit to user space for converting is required instead of a mere retry? Or, is it because how .is_private is assigned in patch 21 is subjected to change in future? > + kvm_mmu_prepare_memory_fault_exit(vcpu, fault); > + return -EFAULT; > + } > + > + if (fault->is_private) > + return kvm_faultin_pfn_private(vcpu, fault); > + > async = false; > fault->pfn = __gfn_to_pfn_memslot(slot, fault->gfn, false, false, &async, > fault->write, &fault->map_writable, > @@ -7184,6 +7255,19 @@ void kvm_mmu_pre_destroy_vm(struct kvm *kvm) > } >