19ed24f4bSMarc Zyngier // SPDX-License-Identifier: GPL-2.0-only 29ed24f4bSMarc Zyngier /* 39ed24f4bSMarc Zyngier * Copyright (C) 2012 - Virtual Open Systems and Columbia University 49ed24f4bSMarc Zyngier * Author: Christoffer Dall <c.dall@virtualopensystems.com> 59ed24f4bSMarc Zyngier */ 69ed24f4bSMarc Zyngier 79ed24f4bSMarc Zyngier #include <linux/bug.h> 89ed24f4bSMarc Zyngier #include <linux/cpu_pm.h> 96caa5812SOliver Upton #include <linux/entry-kvm.h> 109ed24f4bSMarc Zyngier #include <linux/errno.h> 119ed24f4bSMarc Zyngier #include <linux/err.h> 129ed24f4bSMarc Zyngier #include <linux/kvm_host.h> 139ed24f4bSMarc Zyngier #include <linux/list.h> 149ed24f4bSMarc Zyngier #include <linux/module.h> 159ed24f4bSMarc Zyngier #include <linux/vmalloc.h> 169ed24f4bSMarc Zyngier #include <linux/fs.h> 179ed24f4bSMarc Zyngier #include <linux/mman.h> 189ed24f4bSMarc Zyngier #include <linux/sched.h> 199ed24f4bSMarc Zyngier #include <linux/kvm.h> 209ed24f4bSMarc Zyngier #include <linux/kvm_irqfd.h> 219ed24f4bSMarc Zyngier #include <linux/irqbypass.h> 229ed24f4bSMarc Zyngier #include <linux/sched/stat.h> 23eeeee719SDavid Brazdil #include <linux/psci.h> 249ed24f4bSMarc Zyngier #include <trace/events/kvm.h> 259ed24f4bSMarc Zyngier 269ed24f4bSMarc Zyngier #define CREATE_TRACE_POINTS 279ed24f4bSMarc Zyngier #include "trace_arm.h" 289ed24f4bSMarc Zyngier 299ed24f4bSMarc Zyngier #include <linux/uaccess.h> 309ed24f4bSMarc Zyngier #include <asm/ptrace.h> 319ed24f4bSMarc Zyngier #include <asm/mman.h> 329ed24f4bSMarc Zyngier #include <asm/tlbflush.h> 339ed24f4bSMarc Zyngier #include <asm/cacheflush.h> 349ed24f4bSMarc Zyngier #include <asm/cpufeature.h> 359ed24f4bSMarc Zyngier #include <asm/virt.h> 369ed24f4bSMarc Zyngier #include <asm/kvm_arm.h> 379ed24f4bSMarc Zyngier #include <asm/kvm_asm.h> 389ed24f4bSMarc Zyngier #include <asm/kvm_mmu.h> 399d0c063aSFuad Tabba #include <asm/kvm_pkvm.h> 409ed24f4bSMarc Zyngier #include <asm/kvm_emulate.h> 419ed24f4bSMarc Zyngier #include <asm/sections.h> 429ed24f4bSMarc Zyngier 439ed24f4bSMarc Zyngier #include <kvm/arm_hypercalls.h> 449ed24f4bSMarc Zyngier #include <kvm/arm_pmu.h> 459ed24f4bSMarc Zyngier #include <kvm/arm_psci.h> 469ed24f4bSMarc Zyngier 47d8b369c4SDavid Brazdil static enum kvm_mode kvm_mode = KVM_MODE_DEFAULT; 48d8b369c4SDavid Brazdil 4914ef9d04SMarc Zyngier DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector); 5014ef9d04SMarc Zyngier 51db129d48SKalesh Singh DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); 5263fec243SDavid Brazdil DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params); 539ed24f4bSMarc Zyngier 549ed24f4bSMarc Zyngier static bool vgic_present; 559ed24f4bSMarc Zyngier 569ed24f4bSMarc Zyngier static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled); 579ed24f4bSMarc Zyngier DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use); 589ed24f4bSMarc Zyngier 599ed24f4bSMarc Zyngier int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) 609ed24f4bSMarc Zyngier { 619ed24f4bSMarc Zyngier return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; 629ed24f4bSMarc Zyngier } 639ed24f4bSMarc Zyngier 649ed24f4bSMarc Zyngier int kvm_vm_ioctl_enable_cap(struct kvm *kvm, 659ed24f4bSMarc Zyngier struct kvm_enable_cap *cap) 669ed24f4bSMarc Zyngier { 679ed24f4bSMarc Zyngier int r; 689ed24f4bSMarc Zyngier 699ed24f4bSMarc Zyngier if (cap->flags) 709ed24f4bSMarc Zyngier return -EINVAL; 719ed24f4bSMarc Zyngier 729ed24f4bSMarc Zyngier switch (cap->cap) { 739ed24f4bSMarc Zyngier case KVM_CAP_ARM_NISV_TO_USER: 749ed24f4bSMarc Zyngier r = 0; 7506394531SMarc Zyngier set_bit(KVM_ARCH_FLAG_RETURN_NISV_IO_ABORT_TO_USER, 7606394531SMarc Zyngier &kvm->arch.flags); 779ed24f4bSMarc Zyngier break; 78673638f4SSteven Price case KVM_CAP_ARM_MTE: 79c4d7c518SSteven Price mutex_lock(&kvm->lock); 80c4d7c518SSteven Price if (!system_supports_mte() || kvm->created_vcpus) { 81c4d7c518SSteven Price r = -EINVAL; 82c4d7c518SSteven Price } else { 83673638f4SSteven Price r = 0; 8406394531SMarc Zyngier set_bit(KVM_ARCH_FLAG_MTE_ENABLED, &kvm->arch.flags); 85c4d7c518SSteven Price } 86c4d7c518SSteven Price mutex_unlock(&kvm->lock); 87673638f4SSteven Price break; 88bfbab445SOliver Upton case KVM_CAP_ARM_SYSTEM_SUSPEND: 89bfbab445SOliver Upton r = 0; 90bfbab445SOliver Upton set_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags); 91bfbab445SOliver Upton break; 929ed24f4bSMarc Zyngier default: 939ed24f4bSMarc Zyngier r = -EINVAL; 949ed24f4bSMarc Zyngier break; 959ed24f4bSMarc Zyngier } 969ed24f4bSMarc Zyngier 979ed24f4bSMarc Zyngier return r; 989ed24f4bSMarc Zyngier } 999ed24f4bSMarc Zyngier 1005107000fSMarc Zyngier static int kvm_arm_default_max_vcpus(void) 1015107000fSMarc Zyngier { 1025107000fSMarc Zyngier return vgic_present ? kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS; 1035107000fSMarc Zyngier } 1045107000fSMarc Zyngier 1054f1df628SMarc Zyngier static void set_default_spectre(struct kvm *kvm) 10623711a5eSMarc Zyngier { 10723711a5eSMarc Zyngier /* 10823711a5eSMarc Zyngier * The default is to expose CSV2 == 1 if the HW isn't affected. 10923711a5eSMarc Zyngier * Although this is a per-CPU feature, we make it global because 11023711a5eSMarc Zyngier * asymmetric systems are just a nuisance. 11123711a5eSMarc Zyngier * 11223711a5eSMarc Zyngier * Userspace can override this as long as it doesn't promise 11323711a5eSMarc Zyngier * the impossible. 11423711a5eSMarc Zyngier */ 11523711a5eSMarc Zyngier if (arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED) 11623711a5eSMarc Zyngier kvm->arch.pfr0_csv2 = 1; 1174f1df628SMarc Zyngier if (arm64_get_meltdown_state() == SPECTRE_UNAFFECTED) 1184f1df628SMarc Zyngier kvm->arch.pfr0_csv3 = 1; 11923711a5eSMarc Zyngier } 12023711a5eSMarc Zyngier 1219ed24f4bSMarc Zyngier /** 1229ed24f4bSMarc Zyngier * kvm_arch_init_vm - initializes a VM data structure 1239ed24f4bSMarc Zyngier * @kvm: pointer to the KVM struct 1249ed24f4bSMarc Zyngier */ 1259ed24f4bSMarc Zyngier int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) 1269ed24f4bSMarc Zyngier { 127a0e50aa3SChristoffer Dall int ret; 1289ed24f4bSMarc Zyngier 129c43120afSOliver Upton mutex_init(&kvm->arch.config_lock); 130c43120afSOliver Upton 131c43120afSOliver Upton #ifdef CONFIG_LOCKDEP 132c43120afSOliver Upton /* Clue in lockdep that the config_lock must be taken inside kvm->lock */ 133c43120afSOliver Upton mutex_lock(&kvm->lock); 134c43120afSOliver Upton mutex_lock(&kvm->arch.config_lock); 135c43120afSOliver Upton mutex_unlock(&kvm->arch.config_lock); 136c43120afSOliver Upton mutex_unlock(&kvm->lock); 137c43120afSOliver Upton #endif 138c43120afSOliver Upton 1393f868e14SQuentin Perret ret = kvm_share_hyp(kvm, kvm + 1); 1409ed24f4bSMarc Zyngier if (ret) 141315775ffSQuentin Perret return ret; 1429ed24f4bSMarc Zyngier 1439d0c063aSFuad Tabba ret = pkvm_init_host_vm(kvm); 1449d0c063aSFuad Tabba if (ret) 145315775ffSQuentin Perret goto err_unshare_kvm; 1469ed24f4bSMarc Zyngier 1475f623a59SOliver Upton if (!zalloc_cpumask_var(&kvm->arch.supported_cpus, GFP_KERNEL_ACCOUNT)) { 148ae187fecSWill Deacon ret = -ENOMEM; 149315775ffSQuentin Perret goto err_unshare_kvm; 150ae187fecSWill Deacon } 151583cda1bSAlexandru Elisei cpumask_copy(kvm->arch.supported_cpus, cpu_possible_mask); 152583cda1bSAlexandru Elisei 153315775ffSQuentin Perret ret = kvm_init_stage2_mmu(kvm, &kvm->arch.mmu, type); 154315775ffSQuentin Perret if (ret) 155315775ffSQuentin Perret goto err_free_cpumask; 156315775ffSQuentin Perret 1579ed24f4bSMarc Zyngier kvm_vgic_early_init(kvm); 1589ed24f4bSMarc Zyngier 1598a5eb2d2SMarc Zyngier kvm_timer_init_vm(kvm); 1608a5eb2d2SMarc Zyngier 1619ed24f4bSMarc Zyngier /* The maximum number of VCPUs is limited by the host's GIC model */ 162f502cc56SSean Christopherson kvm->max_vcpus = kvm_arm_default_max_vcpus(); 1639ed24f4bSMarc Zyngier 1644f1df628SMarc Zyngier set_default_spectre(kvm); 16505714cabSRaghavendra Rao Ananta kvm_arm_init_hypercalls(kvm); 16623711a5eSMarc Zyngier 1673d0dba57SMarc Zyngier /* 1683d0dba57SMarc Zyngier * Initialise the default PMUver before there is a chance to 1693d0dba57SMarc Zyngier * create an actual PMU. 1703d0dba57SMarc Zyngier */ 1713d0dba57SMarc Zyngier kvm->arch.dfr0_pmuver.imp = kvm_arm_pmu_get_pmuver_limit(); 1723d0dba57SMarc Zyngier 173315775ffSQuentin Perret return 0; 174315775ffSQuentin Perret 175315775ffSQuentin Perret err_free_cpumask: 176315775ffSQuentin Perret free_cpumask_var(kvm->arch.supported_cpus); 177315775ffSQuentin Perret err_unshare_kvm: 178315775ffSQuentin Perret kvm_unshare_hyp(kvm, kvm + 1); 1799ed24f4bSMarc Zyngier return ret; 1809ed24f4bSMarc Zyngier } 1819ed24f4bSMarc Zyngier 1829ed24f4bSMarc Zyngier vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) 1839ed24f4bSMarc Zyngier { 1849ed24f4bSMarc Zyngier return VM_FAULT_SIGBUS; 1859ed24f4bSMarc Zyngier } 1869ed24f4bSMarc Zyngier 1879ed24f4bSMarc Zyngier 1889ed24f4bSMarc Zyngier /** 1899ed24f4bSMarc Zyngier * kvm_arch_destroy_vm - destroy the VM data structure 1909ed24f4bSMarc Zyngier * @kvm: pointer to the KVM struct 1919ed24f4bSMarc Zyngier */ 1929ed24f4bSMarc Zyngier void kvm_arch_destroy_vm(struct kvm *kvm) 1939ed24f4bSMarc Zyngier { 194d7eec236SMarc Zyngier bitmap_free(kvm->arch.pmu_filter); 195583cda1bSAlexandru Elisei free_cpumask_var(kvm->arch.supported_cpus); 196d7eec236SMarc Zyngier 1979ed24f4bSMarc Zyngier kvm_vgic_destroy(kvm); 1989ed24f4bSMarc Zyngier 1999d0c063aSFuad Tabba if (is_protected_kvm_enabled()) 2009d0c063aSFuad Tabba pkvm_destroy_hyp_vm(kvm); 2019d0c063aSFuad Tabba 20227592ae8SMarc Zyngier kvm_destroy_vcpus(kvm); 20352b28657SQuentin Perret 20452b28657SQuentin Perret kvm_unshare_hyp(kvm, kvm + 1); 205fb88707dSOliver Upton 206fb88707dSOliver Upton kvm_arm_teardown_hypercalls(kvm); 2079ed24f4bSMarc Zyngier } 2089ed24f4bSMarc Zyngier 2099ed24f4bSMarc Zyngier int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 2109ed24f4bSMarc Zyngier { 2119ed24f4bSMarc Zyngier int r; 2129ed24f4bSMarc Zyngier switch (ext) { 2139ed24f4bSMarc Zyngier case KVM_CAP_IRQCHIP: 2149ed24f4bSMarc Zyngier r = vgic_present; 2159ed24f4bSMarc Zyngier break; 2169ed24f4bSMarc Zyngier case KVM_CAP_IOEVENTFD: 2179ed24f4bSMarc Zyngier case KVM_CAP_DEVICE_CTRL: 2189ed24f4bSMarc Zyngier case KVM_CAP_USER_MEMORY: 2199ed24f4bSMarc Zyngier case KVM_CAP_SYNC_MMU: 2209ed24f4bSMarc Zyngier case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: 2219ed24f4bSMarc Zyngier case KVM_CAP_ONE_REG: 2229ed24f4bSMarc Zyngier case KVM_CAP_ARM_PSCI: 2239ed24f4bSMarc Zyngier case KVM_CAP_ARM_PSCI_0_2: 2249ed24f4bSMarc Zyngier case KVM_CAP_READONLY_MEM: 2259ed24f4bSMarc Zyngier case KVM_CAP_MP_STATE: 2269ed24f4bSMarc Zyngier case KVM_CAP_IMMEDIATE_EXIT: 2279ed24f4bSMarc Zyngier case KVM_CAP_VCPU_EVENTS: 2289ed24f4bSMarc Zyngier case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2: 2299ed24f4bSMarc Zyngier case KVM_CAP_ARM_NISV_TO_USER: 2309ed24f4bSMarc Zyngier case KVM_CAP_ARM_INJECT_EXT_DABT: 23136fb4cd5SWill Deacon case KVM_CAP_SET_GUEST_DEBUG: 23236fb4cd5SWill Deacon case KVM_CAP_VCPU_ATTRIBUTES: 2333bf72569SJianyong Wu case KVM_CAP_PTP_KVM: 234bfbab445SOliver Upton case KVM_CAP_ARM_SYSTEM_SUSPEND: 23552882b9cSAlexey Kardashevskiy case KVM_CAP_IRQFD_RESAMPLE: 23630ec7997SMarc Zyngier case KVM_CAP_COUNTER_OFFSET: 2379ed24f4bSMarc Zyngier r = 1; 2389ed24f4bSMarc Zyngier break; 239fa18aca9SMaxim Levitsky case KVM_CAP_SET_GUEST_DEBUG2: 240fa18aca9SMaxim Levitsky return KVM_GUESTDBG_VALID_MASK; 2419ed24f4bSMarc Zyngier case KVM_CAP_ARM_SET_DEVICE_ADDR: 2429ed24f4bSMarc Zyngier r = 1; 2439ed24f4bSMarc Zyngier break; 2449ed24f4bSMarc Zyngier case KVM_CAP_NR_VCPUS: 245f60a00d7SVitaly Kuznetsov /* 246f60a00d7SVitaly Kuznetsov * ARM64 treats KVM_CAP_NR_CPUS differently from all other 247f60a00d7SVitaly Kuznetsov * architectures, as it does not always bound it to 248f60a00d7SVitaly Kuznetsov * KVM_CAP_MAX_VCPUS. It should not matter much because 249f60a00d7SVitaly Kuznetsov * this is just an advisory value. 250f60a00d7SVitaly Kuznetsov */ 251f60a00d7SVitaly Kuznetsov r = min_t(unsigned int, num_online_cpus(), 252f60a00d7SVitaly Kuznetsov kvm_arm_default_max_vcpus()); 2539ed24f4bSMarc Zyngier break; 2549ed24f4bSMarc Zyngier case KVM_CAP_MAX_VCPUS: 2559ed24f4bSMarc Zyngier case KVM_CAP_MAX_VCPU_ID: 2565107000fSMarc Zyngier if (kvm) 257f502cc56SSean Christopherson r = kvm->max_vcpus; 2585107000fSMarc Zyngier else 2595107000fSMarc Zyngier r = kvm_arm_default_max_vcpus(); 2609ed24f4bSMarc Zyngier break; 2619ed24f4bSMarc Zyngier case KVM_CAP_MSI_DEVID: 2629ed24f4bSMarc Zyngier if (!kvm) 2639ed24f4bSMarc Zyngier r = -EINVAL; 2649ed24f4bSMarc Zyngier else 2659ed24f4bSMarc Zyngier r = kvm->arch.vgic.msis_require_devid; 2669ed24f4bSMarc Zyngier break; 2679ed24f4bSMarc Zyngier case KVM_CAP_ARM_USER_IRQ: 2689ed24f4bSMarc Zyngier /* 2699ed24f4bSMarc Zyngier * 1: EL1_VTIMER, EL1_PTIMER, and PMU. 2709ed24f4bSMarc Zyngier * (bump this number if adding more devices) 2719ed24f4bSMarc Zyngier */ 2729ed24f4bSMarc Zyngier r = 1; 2739ed24f4bSMarc Zyngier break; 274673638f4SSteven Price case KVM_CAP_ARM_MTE: 275673638f4SSteven Price r = system_supports_mte(); 276673638f4SSteven Price break; 277004a0124SAndrew Jones case KVM_CAP_STEAL_TIME: 278004a0124SAndrew Jones r = kvm_arm_pvtime_supported(); 279004a0124SAndrew Jones break; 28036fb4cd5SWill Deacon case KVM_CAP_ARM_EL1_32BIT: 28136fb4cd5SWill Deacon r = cpus_have_const_cap(ARM64_HAS_32BIT_EL1); 2829ed24f4bSMarc Zyngier break; 28336fb4cd5SWill Deacon case KVM_CAP_GUEST_DEBUG_HW_BPS: 28436fb4cd5SWill Deacon r = get_num_brps(); 28536fb4cd5SWill Deacon break; 28636fb4cd5SWill Deacon case KVM_CAP_GUEST_DEBUG_HW_WPS: 28736fb4cd5SWill Deacon r = get_num_wrps(); 28836fb4cd5SWill Deacon break; 28936fb4cd5SWill Deacon case KVM_CAP_ARM_PMU_V3: 29036fb4cd5SWill Deacon r = kvm_arm_support_pmu_v3(); 29136fb4cd5SWill Deacon break; 29236fb4cd5SWill Deacon case KVM_CAP_ARM_INJECT_SERROR_ESR: 29336fb4cd5SWill Deacon r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN); 29436fb4cd5SWill Deacon break; 29536fb4cd5SWill Deacon case KVM_CAP_ARM_VM_IPA_SIZE: 29636fb4cd5SWill Deacon r = get_kvm_ipa_limit(); 29736fb4cd5SWill Deacon break; 29836fb4cd5SWill Deacon case KVM_CAP_ARM_SVE: 29936fb4cd5SWill Deacon r = system_supports_sve(); 30036fb4cd5SWill Deacon break; 30136fb4cd5SWill Deacon case KVM_CAP_ARM_PTRAUTH_ADDRESS: 30236fb4cd5SWill Deacon case KVM_CAP_ARM_PTRAUTH_GENERIC: 30336fb4cd5SWill Deacon r = system_has_full_ptr_auth(); 30436fb4cd5SWill Deacon break; 30536fb4cd5SWill Deacon default: 30636fb4cd5SWill Deacon r = 0; 3079ed24f4bSMarc Zyngier } 30836fb4cd5SWill Deacon 3099ed24f4bSMarc Zyngier return r; 3109ed24f4bSMarc Zyngier } 3119ed24f4bSMarc Zyngier 3129ed24f4bSMarc Zyngier long kvm_arch_dev_ioctl(struct file *filp, 3139ed24f4bSMarc Zyngier unsigned int ioctl, unsigned long arg) 3149ed24f4bSMarc Zyngier { 3159ed24f4bSMarc Zyngier return -EINVAL; 3169ed24f4bSMarc Zyngier } 3179ed24f4bSMarc Zyngier 3189ed24f4bSMarc Zyngier struct kvm *kvm_arch_alloc_vm(void) 3199ed24f4bSMarc Zyngier { 320115bae92SJia He size_t sz = sizeof(struct kvm); 3219ed24f4bSMarc Zyngier 322115bae92SJia He if (!has_vhe()) 323115bae92SJia He return kzalloc(sz, GFP_KERNEL_ACCOUNT); 324115bae92SJia He 325115bae92SJia He return __vmalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_HIGHMEM | __GFP_ZERO); 3269ed24f4bSMarc Zyngier } 3279ed24f4bSMarc Zyngier 3289ed24f4bSMarc Zyngier int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) 3299ed24f4bSMarc Zyngier { 3309ed24f4bSMarc Zyngier if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) 3319ed24f4bSMarc Zyngier return -EBUSY; 3329ed24f4bSMarc Zyngier 333f502cc56SSean Christopherson if (id >= kvm->max_vcpus) 3349ed24f4bSMarc Zyngier return -EINVAL; 3359ed24f4bSMarc Zyngier 3369ed24f4bSMarc Zyngier return 0; 3379ed24f4bSMarc Zyngier } 3389ed24f4bSMarc Zyngier 3399ed24f4bSMarc Zyngier int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) 3409ed24f4bSMarc Zyngier { 3419ed24f4bSMarc Zyngier int err; 3429ed24f4bSMarc Zyngier 3430acc7239SOliver Upton spin_lock_init(&vcpu->arch.mp_state_lock); 3440acc7239SOliver Upton 345c43120afSOliver Upton #ifdef CONFIG_LOCKDEP 346c43120afSOliver Upton /* Inform lockdep that the config_lock is acquired after vcpu->mutex */ 347c43120afSOliver Upton mutex_lock(&vcpu->mutex); 348c43120afSOliver Upton mutex_lock(&vcpu->kvm->arch.config_lock); 349c43120afSOliver Upton mutex_unlock(&vcpu->kvm->arch.config_lock); 350c43120afSOliver Upton mutex_unlock(&vcpu->mutex); 351c43120afSOliver Upton #endif 352c43120afSOliver Upton 3539ed24f4bSMarc Zyngier /* Force users to call KVM_ARM_VCPU_INIT */ 3549ed24f4bSMarc Zyngier vcpu->arch.target = -1; 3559ed24f4bSMarc Zyngier bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); 3569ed24f4bSMarc Zyngier 357e539451bSSean Christopherson vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO; 358e539451bSSean Christopherson 359b4da9187SMarc Zyngier /* 360b4da9187SMarc Zyngier * Default value for the FP state, will be overloaded at load 361b4da9187SMarc Zyngier * time if we support FP (pretty likely) 362b4da9187SMarc Zyngier */ 363b4da9187SMarc Zyngier vcpu->arch.fp_state = FP_STATE_FREE; 364b4da9187SMarc Zyngier 3659ed24f4bSMarc Zyngier /* Set up the timer */ 3669ed24f4bSMarc Zyngier kvm_timer_vcpu_init(vcpu); 3679ed24f4bSMarc Zyngier 3689ed24f4bSMarc Zyngier kvm_pmu_vcpu_init(vcpu); 3699ed24f4bSMarc Zyngier 3709ed24f4bSMarc Zyngier kvm_arm_reset_debug_ptr(vcpu); 3719ed24f4bSMarc Zyngier 3729ed24f4bSMarc Zyngier kvm_arm_pvtime_vcpu_init(&vcpu->arch); 3739ed24f4bSMarc Zyngier 374a0e50aa3SChristoffer Dall vcpu->arch.hw_mmu = &vcpu->kvm->arch.mmu; 375a0e50aa3SChristoffer Dall 3769ed24f4bSMarc Zyngier err = kvm_vgic_vcpu_init(vcpu); 3779ed24f4bSMarc Zyngier if (err) 3789ed24f4bSMarc Zyngier return err; 3799ed24f4bSMarc Zyngier 3803f868e14SQuentin Perret return kvm_share_hyp(vcpu, vcpu + 1); 3819ed24f4bSMarc Zyngier } 3829ed24f4bSMarc Zyngier 3839ed24f4bSMarc Zyngier void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) 3849ed24f4bSMarc Zyngier { 3859ed24f4bSMarc Zyngier } 3869ed24f4bSMarc Zyngier 3879ed24f4bSMarc Zyngier void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) 3889ed24f4bSMarc Zyngier { 389cc5705fbSMarc Zyngier if (vcpu_has_run_once(vcpu) && unlikely(!irqchip_in_kernel(vcpu->kvm))) 3909ed24f4bSMarc Zyngier static_branch_dec(&userspace_irqchip_in_use); 3919ed24f4bSMarc Zyngier 3929af3e08bSWill Deacon kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache); 3939ed24f4bSMarc Zyngier kvm_timer_vcpu_terminate(vcpu); 3949ed24f4bSMarc Zyngier kvm_pmu_vcpu_destroy(vcpu); 3959ed24f4bSMarc Zyngier 3969ed24f4bSMarc Zyngier kvm_arm_vcpu_destroy(vcpu); 3979ed24f4bSMarc Zyngier } 3989ed24f4bSMarc Zyngier 3999ed24f4bSMarc Zyngier void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) 4009ed24f4bSMarc Zyngier { 4016109c5a6SSean Christopherson 4029ed24f4bSMarc Zyngier } 4039ed24f4bSMarc Zyngier 4049ed24f4bSMarc Zyngier void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) 4059ed24f4bSMarc Zyngier { 4066109c5a6SSean Christopherson 4079ed24f4bSMarc Zyngier } 4089ed24f4bSMarc Zyngier 4099ed24f4bSMarc Zyngier void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) 4109ed24f4bSMarc Zyngier { 411a0e50aa3SChristoffer Dall struct kvm_s2_mmu *mmu; 4129ed24f4bSMarc Zyngier int *last_ran; 4139ed24f4bSMarc Zyngier 414a0e50aa3SChristoffer Dall mmu = vcpu->arch.hw_mmu; 415a0e50aa3SChristoffer Dall last_ran = this_cpu_ptr(mmu->last_vcpu_ran); 4169ed24f4bSMarc Zyngier 4179ed24f4bSMarc Zyngier /* 41801dc9262SMarc Zyngier * We guarantee that both TLBs and I-cache are private to each 41901dc9262SMarc Zyngier * vcpu. If detecting that a vcpu from the same VM has 42001dc9262SMarc Zyngier * previously run on the same physical CPU, call into the 42101dc9262SMarc Zyngier * hypervisor code to nuke the relevant contexts. 42201dc9262SMarc Zyngier * 4239ed24f4bSMarc Zyngier * We might get preempted before the vCPU actually runs, but 4249ed24f4bSMarc Zyngier * over-invalidation doesn't affect correctness. 4259ed24f4bSMarc Zyngier */ 4269ed24f4bSMarc Zyngier if (*last_ran != vcpu->vcpu_id) { 42701dc9262SMarc Zyngier kvm_call_hyp(__kvm_flush_cpu_context, mmu); 4289ed24f4bSMarc Zyngier *last_ran = vcpu->vcpu_id; 4299ed24f4bSMarc Zyngier } 4309ed24f4bSMarc Zyngier 4319ed24f4bSMarc Zyngier vcpu->cpu = cpu; 4329ed24f4bSMarc Zyngier 4339ed24f4bSMarc Zyngier kvm_vgic_load(vcpu); 4349ed24f4bSMarc Zyngier kvm_timer_vcpu_load(vcpu); 43513aeb9b4SDavid Brazdil if (has_vhe()) 43613aeb9b4SDavid Brazdil kvm_vcpu_load_sysregs_vhe(vcpu); 4379ed24f4bSMarc Zyngier kvm_arch_vcpu_load_fp(vcpu); 4389ed24f4bSMarc Zyngier kvm_vcpu_pmu_restore_guest(vcpu); 4399ed24f4bSMarc Zyngier if (kvm_arm_is_pvtime_enabled(&vcpu->arch)) 4409ed24f4bSMarc Zyngier kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu); 4419ed24f4bSMarc Zyngier 4429ed24f4bSMarc Zyngier if (single_task_running()) 4439ed24f4bSMarc Zyngier vcpu_clear_wfx_traps(vcpu); 4449ed24f4bSMarc Zyngier else 4459ed24f4bSMarc Zyngier vcpu_set_wfx_traps(vcpu); 4469ed24f4bSMarc Zyngier 44729eb5a3cSMarc Zyngier if (vcpu_has_ptrauth(vcpu)) 448ef3e40a7SMarc Zyngier vcpu_ptrauth_disable(vcpu); 449d2602bb4SSuzuki K Poulose kvm_arch_vcpu_load_debug_state_flags(vcpu); 450583cda1bSAlexandru Elisei 451583cda1bSAlexandru Elisei if (!cpumask_test_cpu(smp_processor_id(), vcpu->kvm->arch.supported_cpus)) 452583cda1bSAlexandru Elisei vcpu_set_on_unsupported_cpu(vcpu); 4539ed24f4bSMarc Zyngier } 4549ed24f4bSMarc Zyngier 4559ed24f4bSMarc Zyngier void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) 4569ed24f4bSMarc Zyngier { 457d2602bb4SSuzuki K Poulose kvm_arch_vcpu_put_debug_state_flags(vcpu); 4589ed24f4bSMarc Zyngier kvm_arch_vcpu_put_fp(vcpu); 45913aeb9b4SDavid Brazdil if (has_vhe()) 46013aeb9b4SDavid Brazdil kvm_vcpu_put_sysregs_vhe(vcpu); 4619ed24f4bSMarc Zyngier kvm_timer_vcpu_put(vcpu); 4629ed24f4bSMarc Zyngier kvm_vgic_put(vcpu); 4639ed24f4bSMarc Zyngier kvm_vcpu_pmu_restore_host(vcpu); 464100b4f09SShameer Kolothum kvm_arm_vmid_clear_active(); 4659ed24f4bSMarc Zyngier 466583cda1bSAlexandru Elisei vcpu_clear_on_unsupported_cpu(vcpu); 4679ed24f4bSMarc Zyngier vcpu->cpu = -1; 4689ed24f4bSMarc Zyngier } 4699ed24f4bSMarc Zyngier 4700acc7239SOliver Upton static void __kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu) 4719ed24f4bSMarc Zyngier { 4720acc7239SOliver Upton WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_STOPPED); 4739ed24f4bSMarc Zyngier kvm_make_request(KVM_REQ_SLEEP, vcpu); 4749ed24f4bSMarc Zyngier kvm_vcpu_kick(vcpu); 4759ed24f4bSMarc Zyngier } 4769ed24f4bSMarc Zyngier 4770acc7239SOliver Upton void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu) 4780acc7239SOliver Upton { 4790acc7239SOliver Upton spin_lock(&vcpu->arch.mp_state_lock); 4800acc7239SOliver Upton __kvm_arm_vcpu_power_off(vcpu); 4810acc7239SOliver Upton spin_unlock(&vcpu->arch.mp_state_lock); 4820acc7239SOliver Upton } 4830acc7239SOliver Upton 484b171f9bbSOliver Upton bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu) 485b171f9bbSOliver Upton { 4860acc7239SOliver Upton return READ_ONCE(vcpu->arch.mp_state.mp_state) == KVM_MP_STATE_STOPPED; 487b171f9bbSOliver Upton } 488b171f9bbSOliver Upton 4897b33a09dSOliver Upton static void kvm_arm_vcpu_suspend(struct kvm_vcpu *vcpu) 4907b33a09dSOliver Upton { 4910acc7239SOliver Upton WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_SUSPENDED); 4927b33a09dSOliver Upton kvm_make_request(KVM_REQ_SUSPEND, vcpu); 4937b33a09dSOliver Upton kvm_vcpu_kick(vcpu); 4947b33a09dSOliver Upton } 4957b33a09dSOliver Upton 4967b33a09dSOliver Upton static bool kvm_arm_vcpu_suspended(struct kvm_vcpu *vcpu) 4977b33a09dSOliver Upton { 4980acc7239SOliver Upton return READ_ONCE(vcpu->arch.mp_state.mp_state) == KVM_MP_STATE_SUSPENDED; 4997b33a09dSOliver Upton } 5007b33a09dSOliver Upton 5019ed24f4bSMarc Zyngier int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, 5029ed24f4bSMarc Zyngier struct kvm_mp_state *mp_state) 5039ed24f4bSMarc Zyngier { 5040acc7239SOliver Upton *mp_state = READ_ONCE(vcpu->arch.mp_state); 5059ed24f4bSMarc Zyngier 5069ed24f4bSMarc Zyngier return 0; 5079ed24f4bSMarc Zyngier } 5089ed24f4bSMarc Zyngier 5099ed24f4bSMarc Zyngier int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, 5109ed24f4bSMarc Zyngier struct kvm_mp_state *mp_state) 5119ed24f4bSMarc Zyngier { 5129ed24f4bSMarc Zyngier int ret = 0; 5139ed24f4bSMarc Zyngier 5140acc7239SOliver Upton spin_lock(&vcpu->arch.mp_state_lock); 5150acc7239SOliver Upton 5169ed24f4bSMarc Zyngier switch (mp_state->mp_state) { 5179ed24f4bSMarc Zyngier case KVM_MP_STATE_RUNNABLE: 5180acc7239SOliver Upton WRITE_ONCE(vcpu->arch.mp_state, *mp_state); 5199ed24f4bSMarc Zyngier break; 5209ed24f4bSMarc Zyngier case KVM_MP_STATE_STOPPED: 5210acc7239SOliver Upton __kvm_arm_vcpu_power_off(vcpu); 5229ed24f4bSMarc Zyngier break; 5237b33a09dSOliver Upton case KVM_MP_STATE_SUSPENDED: 5247b33a09dSOliver Upton kvm_arm_vcpu_suspend(vcpu); 5259ed24f4bSMarc Zyngier break; 5269ed24f4bSMarc Zyngier default: 5279ed24f4bSMarc Zyngier ret = -EINVAL; 5289ed24f4bSMarc Zyngier } 5299ed24f4bSMarc Zyngier 5300acc7239SOliver Upton spin_unlock(&vcpu->arch.mp_state_lock); 5310acc7239SOliver Upton 5329ed24f4bSMarc Zyngier return ret; 5339ed24f4bSMarc Zyngier } 5349ed24f4bSMarc Zyngier 5359ed24f4bSMarc Zyngier /** 5369ed24f4bSMarc Zyngier * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled 5379ed24f4bSMarc Zyngier * @v: The VCPU pointer 5389ed24f4bSMarc Zyngier * 5399ed24f4bSMarc Zyngier * If the guest CPU is not waiting for interrupts or an interrupt line is 5409ed24f4bSMarc Zyngier * asserted, the CPU is by definition runnable. 5419ed24f4bSMarc Zyngier */ 5429ed24f4bSMarc Zyngier int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) 5439ed24f4bSMarc Zyngier { 5449ed24f4bSMarc Zyngier bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF); 5459ed24f4bSMarc Zyngier return ((irq_lines || kvm_vgic_vcpu_pending_irq(v)) 546b171f9bbSOliver Upton && !kvm_arm_vcpu_stopped(v) && !v->arch.pause); 5479ed24f4bSMarc Zyngier } 5489ed24f4bSMarc Zyngier 5499ed24f4bSMarc Zyngier bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu) 5509ed24f4bSMarc Zyngier { 5519ed24f4bSMarc Zyngier return vcpu_mode_priv(vcpu); 5529ed24f4bSMarc Zyngier } 5539ed24f4bSMarc Zyngier 5548e5b0adeSLinus Torvalds #ifdef CONFIG_GUEST_PERF_EVENTS 555e1bfc245SSean Christopherson unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu) 556e1bfc245SSean Christopherson { 557e1bfc245SSean Christopherson return *vcpu_pc(vcpu); 558e1bfc245SSean Christopherson } 5598e5b0adeSLinus Torvalds #endif 560e1bfc245SSean Christopherson 561b5aa368aSMarc Zyngier static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) 562052f064dSMarc Zyngier { 563b5aa368aSMarc Zyngier return vcpu->arch.target >= 0; 564052f064dSMarc Zyngier } 565052f064dSMarc Zyngier 566b5aa368aSMarc Zyngier /* 567b5aa368aSMarc Zyngier * Handle both the initialisation that is being done when the vcpu is 568b5aa368aSMarc Zyngier * run for the first time, as well as the updates that must be 569b5aa368aSMarc Zyngier * performed each time we get a new thread dealing with this vcpu. 570b5aa368aSMarc Zyngier */ 571b5aa368aSMarc Zyngier int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu) 5729ed24f4bSMarc Zyngier { 5739ed24f4bSMarc Zyngier struct kvm *kvm = vcpu->kvm; 574b5aa368aSMarc Zyngier int ret; 5759ed24f4bSMarc Zyngier 576b5aa368aSMarc Zyngier if (!kvm_vcpu_initialized(vcpu)) 577b5aa368aSMarc Zyngier return -ENOEXEC; 5789ed24f4bSMarc Zyngier 5799ed24f4bSMarc Zyngier if (!kvm_arm_vcpu_is_finalized(vcpu)) 5809ed24f4bSMarc Zyngier return -EPERM; 5819ed24f4bSMarc Zyngier 582b5aa368aSMarc Zyngier ret = kvm_arch_vcpu_run_map_fp(vcpu); 583b5aa368aSMarc Zyngier if (ret) 584b5aa368aSMarc Zyngier return ret; 585b5aa368aSMarc Zyngier 586cc5705fbSMarc Zyngier if (likely(vcpu_has_run_once(vcpu))) 587b5aa368aSMarc Zyngier return 0; 5889ed24f4bSMarc Zyngier 589263d6287SAlexandru Elisei kvm_arm_vcpu_init_debug(vcpu); 590263d6287SAlexandru Elisei 5919ed24f4bSMarc Zyngier if (likely(irqchip_in_kernel(kvm))) { 5929ed24f4bSMarc Zyngier /* 5939ed24f4bSMarc Zyngier * Map the VGIC hardware resources before running a vcpu the 5949ed24f4bSMarc Zyngier * first time on this VM. 5959ed24f4bSMarc Zyngier */ 5969ed24f4bSMarc Zyngier ret = kvm_vgic_map_resources(kvm); 5979ed24f4bSMarc Zyngier if (ret) 5989ed24f4bSMarc Zyngier return ret; 5999ed24f4bSMarc Zyngier } 6009ed24f4bSMarc Zyngier 6019ed24f4bSMarc Zyngier ret = kvm_timer_enable(vcpu); 6029ed24f4bSMarc Zyngier if (ret) 6039ed24f4bSMarc Zyngier return ret; 6049ed24f4bSMarc Zyngier 6059ed24f4bSMarc Zyngier ret = kvm_arm_pmu_v3_enable(vcpu); 6061408e73dSMarc Zyngier if (ret) 6071408e73dSMarc Zyngier return ret; 6081408e73dSMarc Zyngier 6099d0c063aSFuad Tabba if (is_protected_kvm_enabled()) { 6109d0c063aSFuad Tabba ret = pkvm_create_hyp_vm(kvm); 6119d0c063aSFuad Tabba if (ret) 6129d0c063aSFuad Tabba return ret; 6139d0c063aSFuad Tabba } 6149d0c063aSFuad Tabba 6151408e73dSMarc Zyngier if (!irqchip_in_kernel(kvm)) { 6161408e73dSMarc Zyngier /* 6171408e73dSMarc Zyngier * Tell the rest of the code that there are userspace irqchip 6181408e73dSMarc Zyngier * VMs in the wild. 6191408e73dSMarc Zyngier */ 6201408e73dSMarc Zyngier static_branch_inc(&userspace_irqchip_in_use); 6211408e73dSMarc Zyngier } 6229ed24f4bSMarc Zyngier 6232a0c3433SFuad Tabba /* 6242a0c3433SFuad Tabba * Initialize traps for protected VMs. 6252a0c3433SFuad Tabba * NOTE: Move to run in EL2 directly, rather than via a hypercall, once 6262a0c3433SFuad Tabba * the code is in place for first run initialization at EL2. 6272a0c3433SFuad Tabba */ 6282a0c3433SFuad Tabba if (kvm_vm_is_protected(kvm)) 6292a0c3433SFuad Tabba kvm_call_hyp_nvhe(__pkvm_vcpu_init_traps, vcpu); 6302a0c3433SFuad Tabba 6314bba7f7dSOliver Upton mutex_lock(&kvm->arch.config_lock); 63206394531SMarc Zyngier set_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &kvm->arch.flags); 6334bba7f7dSOliver Upton mutex_unlock(&kvm->arch.config_lock); 6345177fe91SMarc Zyngier 6359ed24f4bSMarc Zyngier return ret; 6369ed24f4bSMarc Zyngier } 6379ed24f4bSMarc Zyngier 6389ed24f4bSMarc Zyngier bool kvm_arch_intc_initialized(struct kvm *kvm) 6399ed24f4bSMarc Zyngier { 6409ed24f4bSMarc Zyngier return vgic_initialized(kvm); 6419ed24f4bSMarc Zyngier } 6429ed24f4bSMarc Zyngier 6439ed24f4bSMarc Zyngier void kvm_arm_halt_guest(struct kvm *kvm) 6449ed24f4bSMarc Zyngier { 64546808a4cSMarc Zyngier unsigned long i; 6469ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu; 6479ed24f4bSMarc Zyngier 6489ed24f4bSMarc Zyngier kvm_for_each_vcpu(i, vcpu, kvm) 6499ed24f4bSMarc Zyngier vcpu->arch.pause = true; 6509ed24f4bSMarc Zyngier kvm_make_all_cpus_request(kvm, KVM_REQ_SLEEP); 6519ed24f4bSMarc Zyngier } 6529ed24f4bSMarc Zyngier 6539ed24f4bSMarc Zyngier void kvm_arm_resume_guest(struct kvm *kvm) 6549ed24f4bSMarc Zyngier { 65546808a4cSMarc Zyngier unsigned long i; 6569ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu; 6579ed24f4bSMarc Zyngier 6589ed24f4bSMarc Zyngier kvm_for_each_vcpu(i, vcpu, kvm) { 6599ed24f4bSMarc Zyngier vcpu->arch.pause = false; 660d92a5d1cSSean Christopherson __kvm_vcpu_wake_up(vcpu); 6619ed24f4bSMarc Zyngier } 6629ed24f4bSMarc Zyngier } 6639ed24f4bSMarc Zyngier 6641c6219e3SOliver Upton static void kvm_vcpu_sleep(struct kvm_vcpu *vcpu) 6659ed24f4bSMarc Zyngier { 66638060944SPaolo Bonzini struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu); 6679ed24f4bSMarc Zyngier 66838060944SPaolo Bonzini rcuwait_wait_event(wait, 669b171f9bbSOliver Upton (!kvm_arm_vcpu_stopped(vcpu)) && (!vcpu->arch.pause), 67038060944SPaolo Bonzini TASK_INTERRUPTIBLE); 6719ed24f4bSMarc Zyngier 672b171f9bbSOliver Upton if (kvm_arm_vcpu_stopped(vcpu) || vcpu->arch.pause) { 6739ed24f4bSMarc Zyngier /* Awaken to handle a signal, request we sleep again later. */ 6749ed24f4bSMarc Zyngier kvm_make_request(KVM_REQ_SLEEP, vcpu); 6759ed24f4bSMarc Zyngier } 6769ed24f4bSMarc Zyngier 6779ed24f4bSMarc Zyngier /* 6789ed24f4bSMarc Zyngier * Make sure we will observe a potential reset request if we've 6799ed24f4bSMarc Zyngier * observed a change to the power state. Pairs with the smp_wmb() in 6809ed24f4bSMarc Zyngier * kvm_psci_vcpu_on(). 6819ed24f4bSMarc Zyngier */ 6829ed24f4bSMarc Zyngier smp_rmb(); 6839ed24f4bSMarc Zyngier } 6849ed24f4bSMarc Zyngier 6856109c5a6SSean Christopherson /** 6866109c5a6SSean Christopherson * kvm_vcpu_wfi - emulate Wait-For-Interrupt behavior 6876109c5a6SSean Christopherson * @vcpu: The VCPU pointer 6886109c5a6SSean Christopherson * 6896109c5a6SSean Christopherson * Suspend execution of a vCPU until a valid wake event is detected, i.e. until 6906109c5a6SSean Christopherson * the vCPU is runnable. The vCPU may or may not be scheduled out, depending 6916109c5a6SSean Christopherson * on when a wake event arrives, e.g. there may already be a pending wake event. 6926109c5a6SSean Christopherson */ 6936109c5a6SSean Christopherson void kvm_vcpu_wfi(struct kvm_vcpu *vcpu) 6946109c5a6SSean Christopherson { 6956109c5a6SSean Christopherson /* 6966109c5a6SSean Christopherson * Sync back the state of the GIC CPU interface so that we have 6976109c5a6SSean Christopherson * the latest PMR and group enables. This ensures that 6986109c5a6SSean Christopherson * kvm_arch_vcpu_runnable has up-to-date data to decide whether 6996109c5a6SSean Christopherson * we have pending interrupts, e.g. when determining if the 7006109c5a6SSean Christopherson * vCPU should block. 7016109c5a6SSean Christopherson * 7026109c5a6SSean Christopherson * For the same reason, we want to tell GICv4 that we need 7036109c5a6SSean Christopherson * doorbells to be signalled, should an interrupt become pending. 7046109c5a6SSean Christopherson */ 7056109c5a6SSean Christopherson preempt_disable(); 7066109c5a6SSean Christopherson kvm_vgic_vmcr_sync(vcpu); 7076109c5a6SSean Christopherson vgic_v4_put(vcpu, true); 7086109c5a6SSean Christopherson preempt_enable(); 7096109c5a6SSean Christopherson 71091b99ea7SSean Christopherson kvm_vcpu_halt(vcpu); 711eebc538dSMarc Zyngier vcpu_clear_flag(vcpu, IN_WFIT); 7126109c5a6SSean Christopherson 7136109c5a6SSean Christopherson preempt_disable(); 7146109c5a6SSean Christopherson vgic_v4_load(vcpu); 7156109c5a6SSean Christopherson preempt_enable(); 7166109c5a6SSean Christopherson } 7176109c5a6SSean Christopherson 7187b33a09dSOliver Upton static int kvm_vcpu_suspend(struct kvm_vcpu *vcpu) 7197b33a09dSOliver Upton { 7207b33a09dSOliver Upton if (!kvm_arm_vcpu_suspended(vcpu)) 7217b33a09dSOliver Upton return 1; 7227b33a09dSOliver Upton 7237b33a09dSOliver Upton kvm_vcpu_wfi(vcpu); 7247b33a09dSOliver Upton 7257b33a09dSOliver Upton /* 7267b33a09dSOliver Upton * The suspend state is sticky; we do not leave it until userspace 7277b33a09dSOliver Upton * explicitly marks the vCPU as runnable. Request that we suspend again 7287b33a09dSOliver Upton * later. 7297b33a09dSOliver Upton */ 7307b33a09dSOliver Upton kvm_make_request(KVM_REQ_SUSPEND, vcpu); 7317b33a09dSOliver Upton 7327b33a09dSOliver Upton /* 7337b33a09dSOliver Upton * Check to make sure the vCPU is actually runnable. If so, exit to 7347b33a09dSOliver Upton * userspace informing it of the wakeup condition. 7357b33a09dSOliver Upton */ 7367b33a09dSOliver Upton if (kvm_arch_vcpu_runnable(vcpu)) { 7377b33a09dSOliver Upton memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event)); 7387b33a09dSOliver Upton vcpu->run->system_event.type = KVM_SYSTEM_EVENT_WAKEUP; 7397b33a09dSOliver Upton vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT; 7407b33a09dSOliver Upton return 0; 7417b33a09dSOliver Upton } 7427b33a09dSOliver Upton 7437b33a09dSOliver Upton /* 7447b33a09dSOliver Upton * Otherwise, we were unblocked to process a different event, such as a 7457b33a09dSOliver Upton * pending signal. Return 1 and allow kvm_arch_vcpu_ioctl_run() to 7467b33a09dSOliver Upton * process the event. 7477b33a09dSOliver Upton */ 7487b33a09dSOliver Upton return 1; 7497b33a09dSOliver Upton } 7507b33a09dSOliver Upton 7513fdd0459SOliver Upton /** 7523fdd0459SOliver Upton * check_vcpu_requests - check and handle pending vCPU requests 7533fdd0459SOliver Upton * @vcpu: the VCPU pointer 7543fdd0459SOliver Upton * 7553fdd0459SOliver Upton * Return: 1 if we should enter the guest 7563fdd0459SOliver Upton * 0 if we should exit to userspace 7573fdd0459SOliver Upton * < 0 if we should exit to userspace, where the return value indicates 7583fdd0459SOliver Upton * an error 7593fdd0459SOliver Upton */ 7603fdd0459SOliver Upton static int check_vcpu_requests(struct kvm_vcpu *vcpu) 7619ed24f4bSMarc Zyngier { 7629ed24f4bSMarc Zyngier if (kvm_request_pending(vcpu)) { 7639ed24f4bSMarc Zyngier if (kvm_check_request(KVM_REQ_SLEEP, vcpu)) 7641c6219e3SOliver Upton kvm_vcpu_sleep(vcpu); 7659ed24f4bSMarc Zyngier 7669ed24f4bSMarc Zyngier if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu)) 7679ed24f4bSMarc Zyngier kvm_reset_vcpu(vcpu); 7689ed24f4bSMarc Zyngier 7699ed24f4bSMarc Zyngier /* 7709ed24f4bSMarc Zyngier * Clear IRQ_PENDING requests that were made to guarantee 7719ed24f4bSMarc Zyngier * that a VCPU sees new virtual interrupts. 7729ed24f4bSMarc Zyngier */ 7739ed24f4bSMarc Zyngier kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu); 7749ed24f4bSMarc Zyngier 7759ed24f4bSMarc Zyngier if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu)) 7769ed24f4bSMarc Zyngier kvm_update_stolen_time(vcpu); 7779ed24f4bSMarc Zyngier 7789ed24f4bSMarc Zyngier if (kvm_check_request(KVM_REQ_RELOAD_GICv4, vcpu)) { 7799ed24f4bSMarc Zyngier /* The distributor enable bits were changed */ 7809ed24f4bSMarc Zyngier preempt_disable(); 7819ed24f4bSMarc Zyngier vgic_v4_put(vcpu, false); 7829ed24f4bSMarc Zyngier vgic_v4_load(vcpu); 7839ed24f4bSMarc Zyngier preempt_enable(); 7849ed24f4bSMarc Zyngier } 785d0c94c49SMarc Zyngier 786d0c94c49SMarc Zyngier if (kvm_check_request(KVM_REQ_RELOAD_PMU, vcpu)) 787d0c94c49SMarc Zyngier kvm_pmu_handle_pmcr(vcpu, 788d0c94c49SMarc Zyngier __vcpu_sys_reg(vcpu, PMCR_EL0)); 7897b33a09dSOliver Upton 7907b33a09dSOliver Upton if (kvm_check_request(KVM_REQ_SUSPEND, vcpu)) 7917b33a09dSOliver Upton return kvm_vcpu_suspend(vcpu); 7929cb1096fSGavin Shan 7939cb1096fSGavin Shan if (kvm_dirty_ring_check_request(vcpu)) 7949cb1096fSGavin Shan return 0; 7959ed24f4bSMarc Zyngier } 7963fdd0459SOliver Upton 7973fdd0459SOliver Upton return 1; 7989ed24f4bSMarc Zyngier } 7999ed24f4bSMarc Zyngier 8002f6a49bbSWill Deacon static bool vcpu_mode_is_bad_32bit(struct kvm_vcpu *vcpu) 8012f6a49bbSWill Deacon { 8022f6a49bbSWill Deacon if (likely(!vcpu_mode_is_32bit(vcpu))) 8032f6a49bbSWill Deacon return false; 8042f6a49bbSWill Deacon 805f3c6efc7SOliver Upton return !kvm_supports_32bit_el0(); 8062f6a49bbSWill Deacon } 8072f6a49bbSWill Deacon 8089ed24f4bSMarc Zyngier /** 8096caa5812SOliver Upton * kvm_vcpu_exit_request - returns true if the VCPU should *not* enter the guest 8106caa5812SOliver Upton * @vcpu: The VCPU pointer 8116caa5812SOliver Upton * @ret: Pointer to write optional return code 8126caa5812SOliver Upton * 8136caa5812SOliver Upton * Returns: true if the VCPU needs to return to a preemptible + interruptible 8146caa5812SOliver Upton * and skip guest entry. 8156caa5812SOliver Upton * 8166caa5812SOliver Upton * This function disambiguates between two different types of exits: exits to a 8176caa5812SOliver Upton * preemptible + interruptible kernel context and exits to userspace. For an 8186caa5812SOliver Upton * exit to userspace, this function will write the return code to ret and return 8196caa5812SOliver Upton * true. For an exit to preemptible + interruptible kernel context (i.e. check 8206caa5812SOliver Upton * for pending work and re-enter), return true without writing to ret. 8216caa5812SOliver Upton */ 8226caa5812SOliver Upton static bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu, int *ret) 8236caa5812SOliver Upton { 8246caa5812SOliver Upton struct kvm_run *run = vcpu->run; 8256caa5812SOliver Upton 8266caa5812SOliver Upton /* 8276caa5812SOliver Upton * If we're using a userspace irqchip, then check if we need 8286caa5812SOliver Upton * to tell a userspace irqchip about timer or PMU level 8296caa5812SOliver Upton * changes and if so, exit to userspace (the actual level 8306caa5812SOliver Upton * state gets updated in kvm_timer_update_run and 8316caa5812SOliver Upton * kvm_pmu_update_run below). 8326caa5812SOliver Upton */ 8336caa5812SOliver Upton if (static_branch_unlikely(&userspace_irqchip_in_use)) { 8346caa5812SOliver Upton if (kvm_timer_should_notify_user(vcpu) || 8356caa5812SOliver Upton kvm_pmu_should_notify_user(vcpu)) { 8366caa5812SOliver Upton *ret = -EINTR; 8376caa5812SOliver Upton run->exit_reason = KVM_EXIT_INTR; 8386caa5812SOliver Upton return true; 8396caa5812SOliver Upton } 8406caa5812SOliver Upton } 8416caa5812SOliver Upton 842583cda1bSAlexandru Elisei if (unlikely(vcpu_on_unsupported_cpu(vcpu))) { 843583cda1bSAlexandru Elisei run->exit_reason = KVM_EXIT_FAIL_ENTRY; 844583cda1bSAlexandru Elisei run->fail_entry.hardware_entry_failure_reason = KVM_EXIT_FAIL_ENTRY_CPU_UNSUPPORTED; 845583cda1bSAlexandru Elisei run->fail_entry.cpu = smp_processor_id(); 846583cda1bSAlexandru Elisei *ret = 0; 847583cda1bSAlexandru Elisei return true; 848583cda1bSAlexandru Elisei } 849583cda1bSAlexandru Elisei 8506caa5812SOliver Upton return kvm_request_pending(vcpu) || 8516caa5812SOliver Upton xfer_to_guest_mode_work_pending(); 8526caa5812SOliver Upton } 8536caa5812SOliver Upton 8548cfe148aSMark Rutland /* 8558cfe148aSMark Rutland * Actually run the vCPU, entering an RCU extended quiescent state (EQS) while 8568cfe148aSMark Rutland * the vCPU is running. 8578cfe148aSMark Rutland * 8588cfe148aSMark Rutland * This must be noinstr as instrumentation may make use of RCU, and this is not 8598cfe148aSMark Rutland * safe during the EQS. 8608cfe148aSMark Rutland */ 8618cfe148aSMark Rutland static int noinstr kvm_arm_vcpu_enter_exit(struct kvm_vcpu *vcpu) 8628cfe148aSMark Rutland { 8638cfe148aSMark Rutland int ret; 8648cfe148aSMark Rutland 8658cfe148aSMark Rutland guest_state_enter_irqoff(); 8668cfe148aSMark Rutland ret = kvm_call_hyp_ret(__kvm_vcpu_run, vcpu); 8678cfe148aSMark Rutland guest_state_exit_irqoff(); 8688cfe148aSMark Rutland 8698cfe148aSMark Rutland return ret; 8708cfe148aSMark Rutland } 8718cfe148aSMark Rutland 8726caa5812SOliver Upton /** 8739ed24f4bSMarc Zyngier * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code 8749ed24f4bSMarc Zyngier * @vcpu: The VCPU pointer 8759ed24f4bSMarc Zyngier * 8769ed24f4bSMarc Zyngier * This function is called through the VCPU_RUN ioctl called from user space. It 8779ed24f4bSMarc Zyngier * will execute VM code in a loop until the time slice for the process is used 8789ed24f4bSMarc Zyngier * or some emulation is needed from user space in which case the function will 8799ed24f4bSMarc Zyngier * return with return value 0 and with the kvm_run structure filled in with the 8809ed24f4bSMarc Zyngier * required data for the requested emulation. 8819ed24f4bSMarc Zyngier */ 88238060944SPaolo Bonzini int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu) 8839ed24f4bSMarc Zyngier { 88438060944SPaolo Bonzini struct kvm_run *run = vcpu->run; 8859ed24f4bSMarc Zyngier int ret; 8869ed24f4bSMarc Zyngier 8879ed24f4bSMarc Zyngier if (run->exit_reason == KVM_EXIT_MMIO) { 88874cc7e0cSTianjia Zhang ret = kvm_handle_mmio_return(vcpu); 8899ed24f4bSMarc Zyngier if (ret) 8909ed24f4bSMarc Zyngier return ret; 8919ed24f4bSMarc Zyngier } 8929ed24f4bSMarc Zyngier 8939ed24f4bSMarc Zyngier vcpu_load(vcpu); 8949ed24f4bSMarc Zyngier 895e3e880bbSZenghui Yu if (run->immediate_exit) { 896e3e880bbSZenghui Yu ret = -EINTR; 897e3e880bbSZenghui Yu goto out; 898e3e880bbSZenghui Yu } 899e3e880bbSZenghui Yu 9009ed24f4bSMarc Zyngier kvm_sigset_activate(vcpu); 9019ed24f4bSMarc Zyngier 9029ed24f4bSMarc Zyngier ret = 1; 9039ed24f4bSMarc Zyngier run->exit_reason = KVM_EXIT_UNKNOWN; 90418f3976fSAlexandru Elisei run->flags = 0; 9059ed24f4bSMarc Zyngier while (ret > 0) { 9069ed24f4bSMarc Zyngier /* 9079ed24f4bSMarc Zyngier * Check conditions before entering the guest 9089ed24f4bSMarc Zyngier */ 9096caa5812SOliver Upton ret = xfer_to_guest_mode_handle_work(vcpu); 9106caa5812SOliver Upton if (!ret) 9116caa5812SOliver Upton ret = 1; 9129ed24f4bSMarc Zyngier 9133fdd0459SOliver Upton if (ret > 0) 9143fdd0459SOliver Upton ret = check_vcpu_requests(vcpu); 9159ed24f4bSMarc Zyngier 9169ed24f4bSMarc Zyngier /* 9179ed24f4bSMarc Zyngier * Preparing the interrupts to be injected also 9189ed24f4bSMarc Zyngier * involves poking the GIC, which must be done in a 9199ed24f4bSMarc Zyngier * non-preemptible context. 9209ed24f4bSMarc Zyngier */ 9219ed24f4bSMarc Zyngier preempt_disable(); 9229ed24f4bSMarc Zyngier 9233248136bSJulien Grall /* 9243248136bSJulien Grall * The VMID allocator only tracks active VMIDs per 9253248136bSJulien Grall * physical CPU, and therefore the VMID allocated may not be 9263248136bSJulien Grall * preserved on VMID roll-over if the task was preempted, 9273248136bSJulien Grall * making a thread's VMID inactive. So we need to call 9283248136bSJulien Grall * kvm_arm_vmid_update() in non-premptible context. 9293248136bSJulien Grall */ 9303248136bSJulien Grall kvm_arm_vmid_update(&vcpu->arch.hw_mmu->vmid); 9313248136bSJulien Grall 9329ed24f4bSMarc Zyngier kvm_pmu_flush_hwstate(vcpu); 9339ed24f4bSMarc Zyngier 9349ed24f4bSMarc Zyngier local_irq_disable(); 9359ed24f4bSMarc Zyngier 9369ed24f4bSMarc Zyngier kvm_vgic_flush_hwstate(vcpu); 9379ed24f4bSMarc Zyngier 93884d751a0SFuad Tabba kvm_pmu_update_vcpu_events(vcpu); 93984d751a0SFuad Tabba 9409ed24f4bSMarc Zyngier /* 9419ed24f4bSMarc Zyngier * Ensure we set mode to IN_GUEST_MODE after we disable 9429ed24f4bSMarc Zyngier * interrupts and before the final VCPU requests check. 9439ed24f4bSMarc Zyngier * See the comment in kvm_vcpu_exiting_guest_mode() and 9449ed24f4bSMarc Zyngier * Documentation/virt/kvm/vcpu-requests.rst 9459ed24f4bSMarc Zyngier */ 9469ed24f4bSMarc Zyngier smp_store_mb(vcpu->mode, IN_GUEST_MODE); 9479ed24f4bSMarc Zyngier 9486caa5812SOliver Upton if (ret <= 0 || kvm_vcpu_exit_request(vcpu, &ret)) { 9499ed24f4bSMarc Zyngier vcpu->mode = OUTSIDE_GUEST_MODE; 9509ed24f4bSMarc Zyngier isb(); /* Ensure work in x_flush_hwstate is committed */ 9519ed24f4bSMarc Zyngier kvm_pmu_sync_hwstate(vcpu); 9529ed24f4bSMarc Zyngier if (static_branch_unlikely(&userspace_irqchip_in_use)) 9533c5ff0c6SMarc Zyngier kvm_timer_sync_user(vcpu); 9549ed24f4bSMarc Zyngier kvm_vgic_sync_hwstate(vcpu); 9559ed24f4bSMarc Zyngier local_irq_enable(); 9569ed24f4bSMarc Zyngier preempt_enable(); 9579ed24f4bSMarc Zyngier continue; 9589ed24f4bSMarc Zyngier } 9599ed24f4bSMarc Zyngier 9609ed24f4bSMarc Zyngier kvm_arm_setup_debug(vcpu); 961af9a0e21SMarc Zyngier kvm_arch_vcpu_ctxflush_fp(vcpu); 9629ed24f4bSMarc Zyngier 9639ed24f4bSMarc Zyngier /************************************************************** 9649ed24f4bSMarc Zyngier * Enter the guest 9659ed24f4bSMarc Zyngier */ 9669ed24f4bSMarc Zyngier trace_kvm_entry(*vcpu_pc(vcpu)); 9678cfe148aSMark Rutland guest_timing_enter_irqoff(); 9689ed24f4bSMarc Zyngier 9698cfe148aSMark Rutland ret = kvm_arm_vcpu_enter_exit(vcpu); 9709ed24f4bSMarc Zyngier 9719ed24f4bSMarc Zyngier vcpu->mode = OUTSIDE_GUEST_MODE; 9729ed24f4bSMarc Zyngier vcpu->stat.exits++; 9739ed24f4bSMarc Zyngier /* 9749ed24f4bSMarc Zyngier * Back from guest 9759ed24f4bSMarc Zyngier *************************************************************/ 9769ed24f4bSMarc Zyngier 9779ed24f4bSMarc Zyngier kvm_arm_clear_debug(vcpu); 9789ed24f4bSMarc Zyngier 9799ed24f4bSMarc Zyngier /* 9809ed24f4bSMarc Zyngier * We must sync the PMU state before the vgic state so 9819ed24f4bSMarc Zyngier * that the vgic can properly sample the updated state of the 9829ed24f4bSMarc Zyngier * interrupt line. 9839ed24f4bSMarc Zyngier */ 9849ed24f4bSMarc Zyngier kvm_pmu_sync_hwstate(vcpu); 9859ed24f4bSMarc Zyngier 9869ed24f4bSMarc Zyngier /* 9879ed24f4bSMarc Zyngier * Sync the vgic state before syncing the timer state because 9889ed24f4bSMarc Zyngier * the timer code needs to know if the virtual timer 9899ed24f4bSMarc Zyngier * interrupts are active. 9909ed24f4bSMarc Zyngier */ 9919ed24f4bSMarc Zyngier kvm_vgic_sync_hwstate(vcpu); 9929ed24f4bSMarc Zyngier 9939ed24f4bSMarc Zyngier /* 9949ed24f4bSMarc Zyngier * Sync the timer hardware state before enabling interrupts as 9959ed24f4bSMarc Zyngier * we don't want vtimer interrupts to race with syncing the 9969ed24f4bSMarc Zyngier * timer virtual interrupt state. 9979ed24f4bSMarc Zyngier */ 9989ed24f4bSMarc Zyngier if (static_branch_unlikely(&userspace_irqchip_in_use)) 9993c5ff0c6SMarc Zyngier kvm_timer_sync_user(vcpu); 10009ed24f4bSMarc Zyngier 10019ed24f4bSMarc Zyngier kvm_arch_vcpu_ctxsync_fp(vcpu); 10029ed24f4bSMarc Zyngier 10039ed24f4bSMarc Zyngier /* 10048cfe148aSMark Rutland * We must ensure that any pending interrupts are taken before 10058cfe148aSMark Rutland * we exit guest timing so that timer ticks are accounted as 10068cfe148aSMark Rutland * guest time. Transiently unmask interrupts so that any 10078cfe148aSMark Rutland * pending interrupts are taken. 10089ed24f4bSMarc Zyngier * 10098cfe148aSMark Rutland * Per ARM DDI 0487G.b section D1.13.4, an ISB (or other 10108cfe148aSMark Rutland * context synchronization event) is necessary to ensure that 10118cfe148aSMark Rutland * pending interrupts are taken. 10129ed24f4bSMarc Zyngier */ 1013f7659f8bSMarc Zyngier if (ARM_EXCEPTION_CODE(ret) == ARM_EXCEPTION_IRQ) { 10149ed24f4bSMarc Zyngier local_irq_enable(); 10158cfe148aSMark Rutland isb(); 10168cfe148aSMark Rutland local_irq_disable(); 1017f7659f8bSMarc Zyngier } 10189ed24f4bSMarc Zyngier 10198cfe148aSMark Rutland guest_timing_exit_irqoff(); 10208cfe148aSMark Rutland 10218cfe148aSMark Rutland local_irq_enable(); 10228cfe148aSMark Rutland 10239ed24f4bSMarc Zyngier trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu)); 10249ed24f4bSMarc Zyngier 10259ed24f4bSMarc Zyngier /* Exit types that need handling before we can be preempted */ 102674cc7e0cSTianjia Zhang handle_exit_early(vcpu, ret); 10279ed24f4bSMarc Zyngier 10289ed24f4bSMarc Zyngier preempt_enable(); 10299ed24f4bSMarc Zyngier 103022f55384SQais Yousef /* 103122f55384SQais Yousef * The ARMv8 architecture doesn't give the hypervisor 103222f55384SQais Yousef * a mechanism to prevent a guest from dropping to AArch32 EL0 103322f55384SQais Yousef * if implemented by the CPU. If we spot the guest in such 103422f55384SQais Yousef * state and that we decided it wasn't supposed to do so (like 103522f55384SQais Yousef * with the asymmetric AArch32 case), return to userspace with 103622f55384SQais Yousef * a fatal error. 103722f55384SQais Yousef */ 10382f6a49bbSWill Deacon if (vcpu_mode_is_bad_32bit(vcpu)) { 103922f55384SQais Yousef /* 104022f55384SQais Yousef * As we have caught the guest red-handed, decide that 104122f55384SQais Yousef * it isn't fit for purpose anymore by making the vcpu 104222f55384SQais Yousef * invalid. The VMM can try and fix it by issuing a 104322f55384SQais Yousef * KVM_ARM_VCPU_INIT if it really wants to. 104422f55384SQais Yousef */ 104522f55384SQais Yousef vcpu->arch.target = -1; 104622f55384SQais Yousef ret = ARM_EXCEPTION_IL; 104722f55384SQais Yousef } 104822f55384SQais Yousef 104974cc7e0cSTianjia Zhang ret = handle_exit(vcpu, ret); 10509ed24f4bSMarc Zyngier } 10519ed24f4bSMarc Zyngier 10529ed24f4bSMarc Zyngier /* Tell userspace about in-kernel device output levels */ 10539ed24f4bSMarc Zyngier if (unlikely(!irqchip_in_kernel(vcpu->kvm))) { 10549ed24f4bSMarc Zyngier kvm_timer_update_run(vcpu); 10559ed24f4bSMarc Zyngier kvm_pmu_update_run(vcpu); 10569ed24f4bSMarc Zyngier } 10579ed24f4bSMarc Zyngier 10589ed24f4bSMarc Zyngier kvm_sigset_deactivate(vcpu); 10599ed24f4bSMarc Zyngier 1060e3e880bbSZenghui Yu out: 106126778aaaSMarc Zyngier /* 106226778aaaSMarc Zyngier * In the unlikely event that we are returning to userspace 106326778aaaSMarc Zyngier * with pending exceptions or PC adjustment, commit these 106426778aaaSMarc Zyngier * adjustments in order to give userspace a consistent view of 106526778aaaSMarc Zyngier * the vcpu state. Note that this relies on __kvm_adjust_pc() 106626778aaaSMarc Zyngier * being preempt-safe on VHE. 106726778aaaSMarc Zyngier */ 1068699bb2e0SMarc Zyngier if (unlikely(vcpu_get_flag(vcpu, PENDING_EXCEPTION) || 1069699bb2e0SMarc Zyngier vcpu_get_flag(vcpu, INCREMENT_PC))) 107026778aaaSMarc Zyngier kvm_call_hyp(__kvm_adjust_pc, vcpu); 107126778aaaSMarc Zyngier 10729ed24f4bSMarc Zyngier vcpu_put(vcpu); 10739ed24f4bSMarc Zyngier return ret; 10749ed24f4bSMarc Zyngier } 10759ed24f4bSMarc Zyngier 10769ed24f4bSMarc Zyngier static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) 10779ed24f4bSMarc Zyngier { 10789ed24f4bSMarc Zyngier int bit_index; 10799ed24f4bSMarc Zyngier bool set; 10809ed24f4bSMarc Zyngier unsigned long *hcr; 10819ed24f4bSMarc Zyngier 10829ed24f4bSMarc Zyngier if (number == KVM_ARM_IRQ_CPU_IRQ) 10839ed24f4bSMarc Zyngier bit_index = __ffs(HCR_VI); 10849ed24f4bSMarc Zyngier else /* KVM_ARM_IRQ_CPU_FIQ */ 10859ed24f4bSMarc Zyngier bit_index = __ffs(HCR_VF); 10869ed24f4bSMarc Zyngier 10879ed24f4bSMarc Zyngier hcr = vcpu_hcr(vcpu); 10889ed24f4bSMarc Zyngier if (level) 10899ed24f4bSMarc Zyngier set = test_and_set_bit(bit_index, hcr); 10909ed24f4bSMarc Zyngier else 10919ed24f4bSMarc Zyngier set = test_and_clear_bit(bit_index, hcr); 10929ed24f4bSMarc Zyngier 10939ed24f4bSMarc Zyngier /* 10949ed24f4bSMarc Zyngier * If we didn't change anything, no need to wake up or kick other CPUs 10959ed24f4bSMarc Zyngier */ 10969ed24f4bSMarc Zyngier if (set == level) 10979ed24f4bSMarc Zyngier return 0; 10989ed24f4bSMarc Zyngier 10999ed24f4bSMarc Zyngier /* 11009ed24f4bSMarc Zyngier * The vcpu irq_lines field was updated, wake up sleeping VCPUs and 11019ed24f4bSMarc Zyngier * trigger a world-switch round on the running physical CPU to set the 11029ed24f4bSMarc Zyngier * virtual IRQ/FIQ fields in the HCR appropriately. 11039ed24f4bSMarc Zyngier */ 11049ed24f4bSMarc Zyngier kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu); 11059ed24f4bSMarc Zyngier kvm_vcpu_kick(vcpu); 11069ed24f4bSMarc Zyngier 11079ed24f4bSMarc Zyngier return 0; 11089ed24f4bSMarc Zyngier } 11099ed24f4bSMarc Zyngier 11109ed24f4bSMarc Zyngier int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, 11119ed24f4bSMarc Zyngier bool line_status) 11129ed24f4bSMarc Zyngier { 11139ed24f4bSMarc Zyngier u32 irq = irq_level->irq; 11149ed24f4bSMarc Zyngier unsigned int irq_type, vcpu_idx, irq_num; 11159ed24f4bSMarc Zyngier int nrcpus = atomic_read(&kvm->online_vcpus); 11169ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu = NULL; 11179ed24f4bSMarc Zyngier bool level = irq_level->level; 11189ed24f4bSMarc Zyngier 11199ed24f4bSMarc Zyngier irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; 11209ed24f4bSMarc Zyngier vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; 11219ed24f4bSMarc Zyngier vcpu_idx += ((irq >> KVM_ARM_IRQ_VCPU2_SHIFT) & KVM_ARM_IRQ_VCPU2_MASK) * (KVM_ARM_IRQ_VCPU_MASK + 1); 11229ed24f4bSMarc Zyngier irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; 11239ed24f4bSMarc Zyngier 11249ed24f4bSMarc Zyngier trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); 11259ed24f4bSMarc Zyngier 11269ed24f4bSMarc Zyngier switch (irq_type) { 11279ed24f4bSMarc Zyngier case KVM_ARM_IRQ_TYPE_CPU: 11289ed24f4bSMarc Zyngier if (irqchip_in_kernel(kvm)) 11299ed24f4bSMarc Zyngier return -ENXIO; 11309ed24f4bSMarc Zyngier 11319ed24f4bSMarc Zyngier if (vcpu_idx >= nrcpus) 11329ed24f4bSMarc Zyngier return -EINVAL; 11339ed24f4bSMarc Zyngier 11349ed24f4bSMarc Zyngier vcpu = kvm_get_vcpu(kvm, vcpu_idx); 11359ed24f4bSMarc Zyngier if (!vcpu) 11369ed24f4bSMarc Zyngier return -EINVAL; 11379ed24f4bSMarc Zyngier 11389ed24f4bSMarc Zyngier if (irq_num > KVM_ARM_IRQ_CPU_FIQ) 11399ed24f4bSMarc Zyngier return -EINVAL; 11409ed24f4bSMarc Zyngier 11419ed24f4bSMarc Zyngier return vcpu_interrupt_line(vcpu, irq_num, level); 11429ed24f4bSMarc Zyngier case KVM_ARM_IRQ_TYPE_PPI: 11439ed24f4bSMarc Zyngier if (!irqchip_in_kernel(kvm)) 11449ed24f4bSMarc Zyngier return -ENXIO; 11459ed24f4bSMarc Zyngier 11469ed24f4bSMarc Zyngier if (vcpu_idx >= nrcpus) 11479ed24f4bSMarc Zyngier return -EINVAL; 11489ed24f4bSMarc Zyngier 11499ed24f4bSMarc Zyngier vcpu = kvm_get_vcpu(kvm, vcpu_idx); 11509ed24f4bSMarc Zyngier if (!vcpu) 11519ed24f4bSMarc Zyngier return -EINVAL; 11529ed24f4bSMarc Zyngier 11539ed24f4bSMarc Zyngier if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) 11549ed24f4bSMarc Zyngier return -EINVAL; 11559ed24f4bSMarc Zyngier 11569ed24f4bSMarc Zyngier return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level, NULL); 11579ed24f4bSMarc Zyngier case KVM_ARM_IRQ_TYPE_SPI: 11589ed24f4bSMarc Zyngier if (!irqchip_in_kernel(kvm)) 11599ed24f4bSMarc Zyngier return -ENXIO; 11609ed24f4bSMarc Zyngier 11619ed24f4bSMarc Zyngier if (irq_num < VGIC_NR_PRIVATE_IRQS) 11629ed24f4bSMarc Zyngier return -EINVAL; 11639ed24f4bSMarc Zyngier 11649ed24f4bSMarc Zyngier return kvm_vgic_inject_irq(kvm, 0, irq_num, level, NULL); 11659ed24f4bSMarc Zyngier } 11669ed24f4bSMarc Zyngier 11679ed24f4bSMarc Zyngier return -EINVAL; 11689ed24f4bSMarc Zyngier } 11699ed24f4bSMarc Zyngier 11709ed24f4bSMarc Zyngier static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, 11719ed24f4bSMarc Zyngier const struct kvm_vcpu_init *init) 11729ed24f4bSMarc Zyngier { 11739ed24f4bSMarc Zyngier unsigned int i, ret; 11746b7982feSAnshuman Khandual u32 phys_target = kvm_target_cpu(); 11759ed24f4bSMarc Zyngier 11769ed24f4bSMarc Zyngier if (init->target != phys_target) 11779ed24f4bSMarc Zyngier return -EINVAL; 11789ed24f4bSMarc Zyngier 11799ed24f4bSMarc Zyngier /* 11809ed24f4bSMarc Zyngier * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must 11819ed24f4bSMarc Zyngier * use the same target. 11829ed24f4bSMarc Zyngier */ 11839ed24f4bSMarc Zyngier if (vcpu->arch.target != -1 && vcpu->arch.target != init->target) 11849ed24f4bSMarc Zyngier return -EINVAL; 11859ed24f4bSMarc Zyngier 11869ed24f4bSMarc Zyngier /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ 11879ed24f4bSMarc Zyngier for (i = 0; i < sizeof(init->features) * 8; i++) { 11889ed24f4bSMarc Zyngier bool set = (init->features[i / 32] & (1 << (i % 32))); 11899ed24f4bSMarc Zyngier 11909ed24f4bSMarc Zyngier if (set && i >= KVM_VCPU_MAX_FEATURES) 11919ed24f4bSMarc Zyngier return -ENOENT; 11929ed24f4bSMarc Zyngier 11939ed24f4bSMarc Zyngier /* 11949ed24f4bSMarc Zyngier * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must 11959ed24f4bSMarc Zyngier * use the same feature set. 11969ed24f4bSMarc Zyngier */ 11979ed24f4bSMarc Zyngier if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES && 11989ed24f4bSMarc Zyngier test_bit(i, vcpu->arch.features) != set) 11999ed24f4bSMarc Zyngier return -EINVAL; 12009ed24f4bSMarc Zyngier 12019ed24f4bSMarc Zyngier if (set) 12029ed24f4bSMarc Zyngier set_bit(i, vcpu->arch.features); 12039ed24f4bSMarc Zyngier } 12049ed24f4bSMarc Zyngier 12059ed24f4bSMarc Zyngier vcpu->arch.target = phys_target; 12069ed24f4bSMarc Zyngier 12079ed24f4bSMarc Zyngier /* Now we know what it is, we can reset it. */ 12089ed24f4bSMarc Zyngier ret = kvm_reset_vcpu(vcpu); 12099ed24f4bSMarc Zyngier if (ret) { 12109ed24f4bSMarc Zyngier vcpu->arch.target = -1; 12119ed24f4bSMarc Zyngier bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); 12129ed24f4bSMarc Zyngier } 12139ed24f4bSMarc Zyngier 12149ed24f4bSMarc Zyngier return ret; 12159ed24f4bSMarc Zyngier } 12169ed24f4bSMarc Zyngier 12179ed24f4bSMarc Zyngier static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, 12189ed24f4bSMarc Zyngier struct kvm_vcpu_init *init) 12199ed24f4bSMarc Zyngier { 12209ed24f4bSMarc Zyngier int ret; 12219ed24f4bSMarc Zyngier 12229ed24f4bSMarc Zyngier ret = kvm_vcpu_set_target(vcpu, init); 12239ed24f4bSMarc Zyngier if (ret) 12249ed24f4bSMarc Zyngier return ret; 12259ed24f4bSMarc Zyngier 12269ed24f4bSMarc Zyngier /* 12279ed24f4bSMarc Zyngier * Ensure a rebooted VM will fault in RAM pages and detect if the 12289ed24f4bSMarc Zyngier * guest MMU is turned off and flush the caches as needed. 1229892713e9SZenghui Yu * 12307ae2f3dbSMarc Zyngier * S2FWB enforces all memory accesses to RAM being cacheable, 12317ae2f3dbSMarc Zyngier * ensuring that the data side is always coherent. We still 12327ae2f3dbSMarc Zyngier * need to invalidate the I-cache though, as FWB does *not* 12337ae2f3dbSMarc Zyngier * imply CTR_EL0.DIC. 12349ed24f4bSMarc Zyngier */ 1235cc5705fbSMarc Zyngier if (vcpu_has_run_once(vcpu)) { 12367ae2f3dbSMarc Zyngier if (!cpus_have_final_cap(ARM64_HAS_STAGE2_FWB)) 12379ed24f4bSMarc Zyngier stage2_unmap_vm(vcpu->kvm); 12387ae2f3dbSMarc Zyngier else 1239fade9c2cSFuad Tabba icache_inval_all_pou(); 12407ae2f3dbSMarc Zyngier } 12419ed24f4bSMarc Zyngier 12429ed24f4bSMarc Zyngier vcpu_reset_hcr(vcpu); 1243cd496228SFuad Tabba vcpu->arch.cptr_el2 = CPTR_EL2_DEFAULT; 12449ed24f4bSMarc Zyngier 12459ed24f4bSMarc Zyngier /* 12469ed24f4bSMarc Zyngier * Handle the "start in power-off" case. 12479ed24f4bSMarc Zyngier */ 12484ff910beSReiji Watanabe spin_lock(&vcpu->arch.mp_state_lock); 12494ff910beSReiji Watanabe 12509ed24f4bSMarc Zyngier if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) 12514ff910beSReiji Watanabe __kvm_arm_vcpu_power_off(vcpu); 12529ed24f4bSMarc Zyngier else 12530acc7239SOliver Upton WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_RUNNABLE); 12549ed24f4bSMarc Zyngier 12554ff910beSReiji Watanabe spin_unlock(&vcpu->arch.mp_state_lock); 12569ed24f4bSMarc Zyngier 12579ed24f4bSMarc Zyngier return 0; 12589ed24f4bSMarc Zyngier } 12599ed24f4bSMarc Zyngier 12609ed24f4bSMarc Zyngier static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu, 12619ed24f4bSMarc Zyngier struct kvm_device_attr *attr) 12629ed24f4bSMarc Zyngier { 12639ed24f4bSMarc Zyngier int ret = -ENXIO; 12649ed24f4bSMarc Zyngier 12659ed24f4bSMarc Zyngier switch (attr->group) { 12669ed24f4bSMarc Zyngier default: 12679ed24f4bSMarc Zyngier ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr); 12689ed24f4bSMarc Zyngier break; 12699ed24f4bSMarc Zyngier } 12709ed24f4bSMarc Zyngier 12719ed24f4bSMarc Zyngier return ret; 12729ed24f4bSMarc Zyngier } 12739ed24f4bSMarc Zyngier 12749ed24f4bSMarc Zyngier static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu, 12759ed24f4bSMarc Zyngier struct kvm_device_attr *attr) 12769ed24f4bSMarc Zyngier { 12779ed24f4bSMarc Zyngier int ret = -ENXIO; 12789ed24f4bSMarc Zyngier 12799ed24f4bSMarc Zyngier switch (attr->group) { 12809ed24f4bSMarc Zyngier default: 12819ed24f4bSMarc Zyngier ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr); 12829ed24f4bSMarc Zyngier break; 12839ed24f4bSMarc Zyngier } 12849ed24f4bSMarc Zyngier 12859ed24f4bSMarc Zyngier return ret; 12869ed24f4bSMarc Zyngier } 12879ed24f4bSMarc Zyngier 12889ed24f4bSMarc Zyngier static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu, 12899ed24f4bSMarc Zyngier struct kvm_device_attr *attr) 12909ed24f4bSMarc Zyngier { 12919ed24f4bSMarc Zyngier int ret = -ENXIO; 12929ed24f4bSMarc Zyngier 12939ed24f4bSMarc Zyngier switch (attr->group) { 12949ed24f4bSMarc Zyngier default: 12959ed24f4bSMarc Zyngier ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr); 12969ed24f4bSMarc Zyngier break; 12979ed24f4bSMarc Zyngier } 12989ed24f4bSMarc Zyngier 12999ed24f4bSMarc Zyngier return ret; 13009ed24f4bSMarc Zyngier } 13019ed24f4bSMarc Zyngier 13029ed24f4bSMarc Zyngier static int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu, 13039ed24f4bSMarc Zyngier struct kvm_vcpu_events *events) 13049ed24f4bSMarc Zyngier { 13059ed24f4bSMarc Zyngier memset(events, 0, sizeof(*events)); 13069ed24f4bSMarc Zyngier 13079ed24f4bSMarc Zyngier return __kvm_arm_vcpu_get_events(vcpu, events); 13089ed24f4bSMarc Zyngier } 13099ed24f4bSMarc Zyngier 13109ed24f4bSMarc Zyngier static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu, 13119ed24f4bSMarc Zyngier struct kvm_vcpu_events *events) 13129ed24f4bSMarc Zyngier { 13139ed24f4bSMarc Zyngier int i; 13149ed24f4bSMarc Zyngier 13159ed24f4bSMarc Zyngier /* check whether the reserved field is zero */ 13169ed24f4bSMarc Zyngier for (i = 0; i < ARRAY_SIZE(events->reserved); i++) 13179ed24f4bSMarc Zyngier if (events->reserved[i]) 13189ed24f4bSMarc Zyngier return -EINVAL; 13199ed24f4bSMarc Zyngier 13209ed24f4bSMarc Zyngier /* check whether the pad field is zero */ 13219ed24f4bSMarc Zyngier for (i = 0; i < ARRAY_SIZE(events->exception.pad); i++) 13229ed24f4bSMarc Zyngier if (events->exception.pad[i]) 13239ed24f4bSMarc Zyngier return -EINVAL; 13249ed24f4bSMarc Zyngier 13259ed24f4bSMarc Zyngier return __kvm_arm_vcpu_set_events(vcpu, events); 13269ed24f4bSMarc Zyngier } 13279ed24f4bSMarc Zyngier 13289ed24f4bSMarc Zyngier long kvm_arch_vcpu_ioctl(struct file *filp, 13299ed24f4bSMarc Zyngier unsigned int ioctl, unsigned long arg) 13309ed24f4bSMarc Zyngier { 13319ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu = filp->private_data; 13329ed24f4bSMarc Zyngier void __user *argp = (void __user *)arg; 13339ed24f4bSMarc Zyngier struct kvm_device_attr attr; 13349ed24f4bSMarc Zyngier long r; 13359ed24f4bSMarc Zyngier 13369ed24f4bSMarc Zyngier switch (ioctl) { 13379ed24f4bSMarc Zyngier case KVM_ARM_VCPU_INIT: { 13389ed24f4bSMarc Zyngier struct kvm_vcpu_init init; 13399ed24f4bSMarc Zyngier 13409ed24f4bSMarc Zyngier r = -EFAULT; 13419ed24f4bSMarc Zyngier if (copy_from_user(&init, argp, sizeof(init))) 13429ed24f4bSMarc Zyngier break; 13439ed24f4bSMarc Zyngier 13449ed24f4bSMarc Zyngier r = kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); 13459ed24f4bSMarc Zyngier break; 13469ed24f4bSMarc Zyngier } 13479ed24f4bSMarc Zyngier case KVM_SET_ONE_REG: 13489ed24f4bSMarc Zyngier case KVM_GET_ONE_REG: { 13499ed24f4bSMarc Zyngier struct kvm_one_reg reg; 13509ed24f4bSMarc Zyngier 13519ed24f4bSMarc Zyngier r = -ENOEXEC; 13529ed24f4bSMarc Zyngier if (unlikely(!kvm_vcpu_initialized(vcpu))) 13539ed24f4bSMarc Zyngier break; 13549ed24f4bSMarc Zyngier 13559ed24f4bSMarc Zyngier r = -EFAULT; 13569ed24f4bSMarc Zyngier if (copy_from_user(®, argp, sizeof(reg))) 13579ed24f4bSMarc Zyngier break; 13589ed24f4bSMarc Zyngier 13596826c684SOliver Upton /* 13606826c684SOliver Upton * We could owe a reset due to PSCI. Handle the pending reset 13616826c684SOliver Upton * here to ensure userspace register accesses are ordered after 13626826c684SOliver Upton * the reset. 13636826c684SOliver Upton */ 13646826c684SOliver Upton if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu)) 13656826c684SOliver Upton kvm_reset_vcpu(vcpu); 13666826c684SOliver Upton 13679ed24f4bSMarc Zyngier if (ioctl == KVM_SET_ONE_REG) 13689ed24f4bSMarc Zyngier r = kvm_arm_set_reg(vcpu, ®); 13699ed24f4bSMarc Zyngier else 13709ed24f4bSMarc Zyngier r = kvm_arm_get_reg(vcpu, ®); 13719ed24f4bSMarc Zyngier break; 13729ed24f4bSMarc Zyngier } 13739ed24f4bSMarc Zyngier case KVM_GET_REG_LIST: { 13749ed24f4bSMarc Zyngier struct kvm_reg_list __user *user_list = argp; 13759ed24f4bSMarc Zyngier struct kvm_reg_list reg_list; 13769ed24f4bSMarc Zyngier unsigned n; 13779ed24f4bSMarc Zyngier 13789ed24f4bSMarc Zyngier r = -ENOEXEC; 13799ed24f4bSMarc Zyngier if (unlikely(!kvm_vcpu_initialized(vcpu))) 13809ed24f4bSMarc Zyngier break; 13819ed24f4bSMarc Zyngier 13829ed24f4bSMarc Zyngier r = -EPERM; 13839ed24f4bSMarc Zyngier if (!kvm_arm_vcpu_is_finalized(vcpu)) 13849ed24f4bSMarc Zyngier break; 13859ed24f4bSMarc Zyngier 13869ed24f4bSMarc Zyngier r = -EFAULT; 13879ed24f4bSMarc Zyngier if (copy_from_user(®_list, user_list, sizeof(reg_list))) 13889ed24f4bSMarc Zyngier break; 13899ed24f4bSMarc Zyngier n = reg_list.n; 13909ed24f4bSMarc Zyngier reg_list.n = kvm_arm_num_regs(vcpu); 13919ed24f4bSMarc Zyngier if (copy_to_user(user_list, ®_list, sizeof(reg_list))) 13929ed24f4bSMarc Zyngier break; 13939ed24f4bSMarc Zyngier r = -E2BIG; 13949ed24f4bSMarc Zyngier if (n < reg_list.n) 13959ed24f4bSMarc Zyngier break; 13969ed24f4bSMarc Zyngier r = kvm_arm_copy_reg_indices(vcpu, user_list->reg); 13979ed24f4bSMarc Zyngier break; 13989ed24f4bSMarc Zyngier } 13999ed24f4bSMarc Zyngier case KVM_SET_DEVICE_ATTR: { 14009ed24f4bSMarc Zyngier r = -EFAULT; 14019ed24f4bSMarc Zyngier if (copy_from_user(&attr, argp, sizeof(attr))) 14029ed24f4bSMarc Zyngier break; 14039ed24f4bSMarc Zyngier r = kvm_arm_vcpu_set_attr(vcpu, &attr); 14049ed24f4bSMarc Zyngier break; 14059ed24f4bSMarc Zyngier } 14069ed24f4bSMarc Zyngier case KVM_GET_DEVICE_ATTR: { 14079ed24f4bSMarc Zyngier r = -EFAULT; 14089ed24f4bSMarc Zyngier if (copy_from_user(&attr, argp, sizeof(attr))) 14099ed24f4bSMarc Zyngier break; 14109ed24f4bSMarc Zyngier r = kvm_arm_vcpu_get_attr(vcpu, &attr); 14119ed24f4bSMarc Zyngier break; 14129ed24f4bSMarc Zyngier } 14139ed24f4bSMarc Zyngier case KVM_HAS_DEVICE_ATTR: { 14149ed24f4bSMarc Zyngier r = -EFAULT; 14159ed24f4bSMarc Zyngier if (copy_from_user(&attr, argp, sizeof(attr))) 14169ed24f4bSMarc Zyngier break; 14179ed24f4bSMarc Zyngier r = kvm_arm_vcpu_has_attr(vcpu, &attr); 14189ed24f4bSMarc Zyngier break; 14199ed24f4bSMarc Zyngier } 14209ed24f4bSMarc Zyngier case KVM_GET_VCPU_EVENTS: { 14219ed24f4bSMarc Zyngier struct kvm_vcpu_events events; 14229ed24f4bSMarc Zyngier 14239ed24f4bSMarc Zyngier if (kvm_arm_vcpu_get_events(vcpu, &events)) 14249ed24f4bSMarc Zyngier return -EINVAL; 14259ed24f4bSMarc Zyngier 14269ed24f4bSMarc Zyngier if (copy_to_user(argp, &events, sizeof(events))) 14279ed24f4bSMarc Zyngier return -EFAULT; 14289ed24f4bSMarc Zyngier 14299ed24f4bSMarc Zyngier return 0; 14309ed24f4bSMarc Zyngier } 14319ed24f4bSMarc Zyngier case KVM_SET_VCPU_EVENTS: { 14329ed24f4bSMarc Zyngier struct kvm_vcpu_events events; 14339ed24f4bSMarc Zyngier 14349ed24f4bSMarc Zyngier if (copy_from_user(&events, argp, sizeof(events))) 14359ed24f4bSMarc Zyngier return -EFAULT; 14369ed24f4bSMarc Zyngier 14379ed24f4bSMarc Zyngier return kvm_arm_vcpu_set_events(vcpu, &events); 14389ed24f4bSMarc Zyngier } 14399ed24f4bSMarc Zyngier case KVM_ARM_VCPU_FINALIZE: { 14409ed24f4bSMarc Zyngier int what; 14419ed24f4bSMarc Zyngier 14429ed24f4bSMarc Zyngier if (!kvm_vcpu_initialized(vcpu)) 14439ed24f4bSMarc Zyngier return -ENOEXEC; 14449ed24f4bSMarc Zyngier 14459ed24f4bSMarc Zyngier if (get_user(what, (const int __user *)argp)) 14469ed24f4bSMarc Zyngier return -EFAULT; 14479ed24f4bSMarc Zyngier 14489ed24f4bSMarc Zyngier return kvm_arm_vcpu_finalize(vcpu, what); 14499ed24f4bSMarc Zyngier } 14509ed24f4bSMarc Zyngier default: 14519ed24f4bSMarc Zyngier r = -EINVAL; 14529ed24f4bSMarc Zyngier } 14539ed24f4bSMarc Zyngier 14549ed24f4bSMarc Zyngier return r; 14559ed24f4bSMarc Zyngier } 14569ed24f4bSMarc Zyngier 14579ed24f4bSMarc Zyngier void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot) 14589ed24f4bSMarc Zyngier { 14599ed24f4bSMarc Zyngier 14609ed24f4bSMarc Zyngier } 14619ed24f4bSMarc Zyngier 14629ed24f4bSMarc Zyngier void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm, 14636c9dd6d2SPaolo Bonzini const struct kvm_memory_slot *memslot) 14649ed24f4bSMarc Zyngier { 14659ed24f4bSMarc Zyngier kvm_flush_remote_tlbs(kvm); 14669ed24f4bSMarc Zyngier } 14679ed24f4bSMarc Zyngier 14689ed24f4bSMarc Zyngier static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, 14699ed24f4bSMarc Zyngier struct kvm_arm_device_addr *dev_addr) 14709ed24f4bSMarc Zyngier { 14719f968c92SMarc Zyngier switch (FIELD_GET(KVM_ARM_DEVICE_ID_MASK, dev_addr->id)) { 14729ed24f4bSMarc Zyngier case KVM_ARM_DEVICE_VGIC_V2: 14739ed24f4bSMarc Zyngier if (!vgic_present) 14749ed24f4bSMarc Zyngier return -ENXIO; 14759f968c92SMarc Zyngier return kvm_set_legacy_vgic_v2_addr(kvm, dev_addr); 14769ed24f4bSMarc Zyngier default: 14779ed24f4bSMarc Zyngier return -ENODEV; 14789ed24f4bSMarc Zyngier } 14799ed24f4bSMarc Zyngier } 14809ed24f4bSMarc Zyngier 1481e0fc6b21SOliver Upton static int kvm_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1482e0fc6b21SOliver Upton { 1483e0fc6b21SOliver Upton switch (attr->group) { 1484821d935cSOliver Upton case KVM_ARM_VM_SMCCC_CTRL: 1485821d935cSOliver Upton return kvm_vm_smccc_has_attr(kvm, attr); 1486e0fc6b21SOliver Upton default: 1487e0fc6b21SOliver Upton return -ENXIO; 1488e0fc6b21SOliver Upton } 1489e0fc6b21SOliver Upton } 1490e0fc6b21SOliver Upton 1491e0fc6b21SOliver Upton static int kvm_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) 1492e0fc6b21SOliver Upton { 1493e0fc6b21SOliver Upton switch (attr->group) { 1494821d935cSOliver Upton case KVM_ARM_VM_SMCCC_CTRL: 1495821d935cSOliver Upton return kvm_vm_smccc_set_attr(kvm, attr); 1496e0fc6b21SOliver Upton default: 1497e0fc6b21SOliver Upton return -ENXIO; 1498e0fc6b21SOliver Upton } 1499e0fc6b21SOliver Upton } 1500e0fc6b21SOliver Upton 1501d8708b80SThomas Huth int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) 15029ed24f4bSMarc Zyngier { 15039ed24f4bSMarc Zyngier struct kvm *kvm = filp->private_data; 15049ed24f4bSMarc Zyngier void __user *argp = (void __user *)arg; 1505e0fc6b21SOliver Upton struct kvm_device_attr attr; 15069ed24f4bSMarc Zyngier 15079ed24f4bSMarc Zyngier switch (ioctl) { 15089ed24f4bSMarc Zyngier case KVM_CREATE_IRQCHIP: { 15099ed24f4bSMarc Zyngier int ret; 15109ed24f4bSMarc Zyngier if (!vgic_present) 15119ed24f4bSMarc Zyngier return -ENXIO; 15129ed24f4bSMarc Zyngier mutex_lock(&kvm->lock); 15139ed24f4bSMarc Zyngier ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2); 15149ed24f4bSMarc Zyngier mutex_unlock(&kvm->lock); 15159ed24f4bSMarc Zyngier return ret; 15169ed24f4bSMarc Zyngier } 15179ed24f4bSMarc Zyngier case KVM_ARM_SET_DEVICE_ADDR: { 15189ed24f4bSMarc Zyngier struct kvm_arm_device_addr dev_addr; 15199ed24f4bSMarc Zyngier 15209ed24f4bSMarc Zyngier if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) 15219ed24f4bSMarc Zyngier return -EFAULT; 15229ed24f4bSMarc Zyngier return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); 15239ed24f4bSMarc Zyngier } 15249ed24f4bSMarc Zyngier case KVM_ARM_PREFERRED_TARGET: { 15259ed24f4bSMarc Zyngier struct kvm_vcpu_init init; 15269ed24f4bSMarc Zyngier 152708e873cbSYueHaibing kvm_vcpu_preferred_target(&init); 15289ed24f4bSMarc Zyngier 15299ed24f4bSMarc Zyngier if (copy_to_user(argp, &init, sizeof(init))) 15309ed24f4bSMarc Zyngier return -EFAULT; 15319ed24f4bSMarc Zyngier 15329ed24f4bSMarc Zyngier return 0; 15339ed24f4bSMarc Zyngier } 1534f0376edbSSteven Price case KVM_ARM_MTE_COPY_TAGS: { 1535f0376edbSSteven Price struct kvm_arm_copy_mte_tags copy_tags; 1536f0376edbSSteven Price 1537f0376edbSSteven Price if (copy_from_user(©_tags, argp, sizeof(copy_tags))) 1538f0376edbSSteven Price return -EFAULT; 1539f0376edbSSteven Price return kvm_vm_ioctl_mte_copy_tags(kvm, ©_tags); 1540f0376edbSSteven Price } 154130ec7997SMarc Zyngier case KVM_ARM_SET_COUNTER_OFFSET: { 154230ec7997SMarc Zyngier struct kvm_arm_counter_offset offset; 154330ec7997SMarc Zyngier 154430ec7997SMarc Zyngier if (copy_from_user(&offset, argp, sizeof(offset))) 154530ec7997SMarc Zyngier return -EFAULT; 154630ec7997SMarc Zyngier return kvm_vm_ioctl_set_counter_offset(kvm, &offset); 154730ec7997SMarc Zyngier } 1548e0fc6b21SOliver Upton case KVM_HAS_DEVICE_ATTR: { 1549e0fc6b21SOliver Upton if (copy_from_user(&attr, argp, sizeof(attr))) 1550e0fc6b21SOliver Upton return -EFAULT; 1551e0fc6b21SOliver Upton 1552e0fc6b21SOliver Upton return kvm_vm_has_attr(kvm, &attr); 1553e0fc6b21SOliver Upton } 1554e0fc6b21SOliver Upton case KVM_SET_DEVICE_ATTR: { 1555e0fc6b21SOliver Upton if (copy_from_user(&attr, argp, sizeof(attr))) 1556e0fc6b21SOliver Upton return -EFAULT; 1557e0fc6b21SOliver Upton 1558e0fc6b21SOliver Upton return kvm_vm_set_attr(kvm, &attr); 1559e0fc6b21SOliver Upton } 15609ed24f4bSMarc Zyngier default: 15619ed24f4bSMarc Zyngier return -EINVAL; 15629ed24f4bSMarc Zyngier } 15639ed24f4bSMarc Zyngier } 15649ed24f4bSMarc Zyngier 156596906a91SMarc Zyngier /* unlocks vcpus from @vcpu_lock_idx and smaller */ 156696906a91SMarc Zyngier static void unlock_vcpus(struct kvm *kvm, int vcpu_lock_idx) 156796906a91SMarc Zyngier { 156896906a91SMarc Zyngier struct kvm_vcpu *tmp_vcpu; 156996906a91SMarc Zyngier 157096906a91SMarc Zyngier for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) { 157196906a91SMarc Zyngier tmp_vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx); 157296906a91SMarc Zyngier mutex_unlock(&tmp_vcpu->mutex); 157396906a91SMarc Zyngier } 157496906a91SMarc Zyngier } 157596906a91SMarc Zyngier 157696906a91SMarc Zyngier void unlock_all_vcpus(struct kvm *kvm) 157796906a91SMarc Zyngier { 157896906a91SMarc Zyngier lockdep_assert_held(&kvm->lock); 157996906a91SMarc Zyngier 158096906a91SMarc Zyngier unlock_vcpus(kvm, atomic_read(&kvm->online_vcpus) - 1); 158196906a91SMarc Zyngier } 158296906a91SMarc Zyngier 158396906a91SMarc Zyngier /* Returns true if all vcpus were locked, false otherwise */ 158496906a91SMarc Zyngier bool lock_all_vcpus(struct kvm *kvm) 158596906a91SMarc Zyngier { 158696906a91SMarc Zyngier struct kvm_vcpu *tmp_vcpu; 158796906a91SMarc Zyngier unsigned long c; 158896906a91SMarc Zyngier 158996906a91SMarc Zyngier lockdep_assert_held(&kvm->lock); 159096906a91SMarc Zyngier 159196906a91SMarc Zyngier /* 159296906a91SMarc Zyngier * Any time a vcpu is in an ioctl (including running), the 159396906a91SMarc Zyngier * core KVM code tries to grab the vcpu->mutex. 159496906a91SMarc Zyngier * 159596906a91SMarc Zyngier * By grabbing the vcpu->mutex of all VCPUs we ensure that no 159696906a91SMarc Zyngier * other VCPUs can fiddle with the state while we access it. 159796906a91SMarc Zyngier */ 159896906a91SMarc Zyngier kvm_for_each_vcpu(c, tmp_vcpu, kvm) { 159996906a91SMarc Zyngier if (!mutex_trylock(&tmp_vcpu->mutex)) { 160096906a91SMarc Zyngier unlock_vcpus(kvm, c - 1); 160196906a91SMarc Zyngier return false; 160296906a91SMarc Zyngier } 160396906a91SMarc Zyngier } 160496906a91SMarc Zyngier 160596906a91SMarc Zyngier return true; 160696906a91SMarc Zyngier } 160796906a91SMarc Zyngier 160830c95391SDavid Brazdil static unsigned long nvhe_percpu_size(void) 160930c95391SDavid Brazdil { 161030c95391SDavid Brazdil return (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_end) - 161130c95391SDavid Brazdil (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_start); 161230c95391SDavid Brazdil } 161330c95391SDavid Brazdil 161430c95391SDavid Brazdil static unsigned long nvhe_percpu_order(void) 161530c95391SDavid Brazdil { 161630c95391SDavid Brazdil unsigned long size = nvhe_percpu_size(); 161730c95391SDavid Brazdil 161830c95391SDavid Brazdil return size ? get_order(size) : 0; 161930c95391SDavid Brazdil } 162030c95391SDavid Brazdil 1621b881cdceSWill Deacon /* A lookup table holding the hypervisor VA for each vector slot */ 1622b881cdceSWill Deacon static void *hyp_spectre_vector_selector[BP_HARDEN_EL2_SLOTS]; 1623de5bcdb4SWill Deacon 1624b881cdceSWill Deacon static void kvm_init_vector_slot(void *base, enum arm64_hyp_spectre_vector slot) 1625b881cdceSWill Deacon { 1626bc1d2892SQuentin Perret hyp_spectre_vector_selector[slot] = __kvm_vector_slot2addr(base, slot); 16279ef2b48bSWill Deacon } 16289ef2b48bSWill Deacon 1629b881cdceSWill Deacon static int kvm_init_vector_slots(void) 1630b881cdceSWill Deacon { 1631b881cdceSWill Deacon int err; 1632b881cdceSWill Deacon void *base; 1633b881cdceSWill Deacon 1634b881cdceSWill Deacon base = kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector)); 1635b881cdceSWill Deacon kvm_init_vector_slot(base, HYP_VECTOR_DIRECT); 1636b881cdceSWill Deacon 1637b881cdceSWill Deacon base = kern_hyp_va(kvm_ksym_ref(__bp_harden_hyp_vecs)); 1638b881cdceSWill Deacon kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_DIRECT); 1639b881cdceSWill Deacon 16402e403167SQuentin Perret if (kvm_system_needs_idmapped_vectors() && 16412e403167SQuentin Perret !is_protected_kvm_enabled()) { 1642b881cdceSWill Deacon err = create_hyp_exec_mappings(__pa_symbol(__bp_harden_hyp_vecs), 1643b881cdceSWill Deacon __BP_HARDEN_HYP_VECS_SZ, &base); 1644b881cdceSWill Deacon if (err) 1645b881cdceSWill Deacon return err; 1646b881cdceSWill Deacon } 16479ef2b48bSWill Deacon 1648b881cdceSWill Deacon kvm_init_vector_slot(base, HYP_VECTOR_INDIRECT); 1649b881cdceSWill Deacon kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_INDIRECT); 16509ef2b48bSWill Deacon return 0; 16519ef2b48bSWill Deacon } 16529ef2b48bSWill Deacon 165353bf620aSSean Christopherson static void __init cpu_prepare_hyp_mode(int cpu, u32 hyp_va_bits) 16549ed24f4bSMarc Zyngier { 16559cc77581SQuentin Perret struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu); 1656d3e1086cSDavid Brazdil unsigned long tcr; 16579ed24f4bSMarc Zyngier 165871b3ec5fSDavid Brazdil /* 165971b3ec5fSDavid Brazdil * Calculate the raw per-cpu offset without a translation from the 166071b3ec5fSDavid Brazdil * kernel's mapping to the linear mapping, and store it in tpidr_el2 166171b3ec5fSDavid Brazdil * so that we can use adr_l to access per-cpu variables in EL2. 1662e1663372SSteven Price * Also drop the KASAN tag which gets in the way... 166371b3ec5fSDavid Brazdil */ 16649cc77581SQuentin Perret params->tpidr_el2 = (unsigned long)kasan_reset_tag(per_cpu_ptr_nvhe_sym(__per_cpu_start, cpu)) - 166530c95391SDavid Brazdil (unsigned long)kvm_ksym_ref(CHOOSE_NVHE_SYM(__per_cpu_start)); 166671b3ec5fSDavid Brazdil 1667d3e1086cSDavid Brazdil params->mair_el2 = read_sysreg(mair_el1); 1668d3e1086cSDavid Brazdil 1669d3e1086cSDavid Brazdil tcr = (read_sysreg(tcr_el1) & TCR_EL2_MASK) | TCR_EL2_RES1; 1670d3e1086cSDavid Brazdil tcr &= ~TCR_T0SZ_MASK; 1671579d7ebeSRyan Roberts tcr |= TCR_T0SZ(hyp_va_bits); 1672d3e1086cSDavid Brazdil params->tcr_el2 = tcr; 1673d3e1086cSDavid Brazdil 167463fec243SDavid Brazdil params->pgd_pa = kvm_mmu_get_httbr(); 1675734864c1SQuentin Perret if (is_protected_kvm_enabled()) 1676734864c1SQuentin Perret params->hcr_el2 = HCR_HOST_NVHE_PROTECTED_FLAGS; 1677734864c1SQuentin Perret else 1678734864c1SQuentin Perret params->hcr_el2 = HCR_HOST_NVHE_FLAGS; 1679734864c1SQuentin Perret params->vttbr = params->vtcr = 0; 168063fec243SDavid Brazdil 168163fec243SDavid Brazdil /* 168263fec243SDavid Brazdil * Flush the init params from the data cache because the struct will 168363fec243SDavid Brazdil * be read while the MMU is off. 168463fec243SDavid Brazdil */ 168563fec243SDavid Brazdil kvm_flush_dcache_to_poc(params, sizeof(*params)); 16869cc77581SQuentin Perret } 16879cc77581SQuentin Perret 1688bfa79a80SQuentin Perret static void hyp_install_host_vector(void) 16899cc77581SQuentin Perret { 16909cc77581SQuentin Perret struct kvm_nvhe_init_params *params; 16919cc77581SQuentin Perret struct arm_smccc_res res; 16929cc77581SQuentin Perret 16939cc77581SQuentin Perret /* Switch from the HYP stub to our own HYP init vector */ 16949cc77581SQuentin Perret __hyp_set_vectors(kvm_get_idmap_vector()); 16959ed24f4bSMarc Zyngier 169671b3ec5fSDavid Brazdil /* 169771b3ec5fSDavid Brazdil * Call initialization code, and switch to the full blown HYP code. 169871b3ec5fSDavid Brazdil * If the cpucaps haven't been finalized yet, something has gone very 169971b3ec5fSDavid Brazdil * wrong, and hyp will crash and burn when it uses any 170071b3ec5fSDavid Brazdil * cpus_have_const_cap() wrapper. 170171b3ec5fSDavid Brazdil */ 170271b3ec5fSDavid Brazdil BUG_ON(!system_capabilities_finalized()); 17039cc77581SQuentin Perret params = this_cpu_ptr_nvhe_sym(kvm_init_params); 170463fec243SDavid Brazdil arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(__kvm_hyp_init), virt_to_phys(params), &res); 170504e4caa8SAndrew Scull WARN_ON(res.a0 != SMCCC_RET_SUCCESS); 1706bfa79a80SQuentin Perret } 1707bfa79a80SQuentin Perret 1708bfa79a80SQuentin Perret static void cpu_init_hyp_mode(void) 1709bfa79a80SQuentin Perret { 1710bfa79a80SQuentin Perret hyp_install_host_vector(); 171171b3ec5fSDavid Brazdil 171271b3ec5fSDavid Brazdil /* 171371b3ec5fSDavid Brazdil * Disabling SSBD on a non-VHE system requires us to enable SSBS 171471b3ec5fSDavid Brazdil * at EL2. 171571b3ec5fSDavid Brazdil */ 171671b3ec5fSDavid Brazdil if (this_cpu_has_cap(ARM64_SSBS) && 1717d63d975aSMarc Zyngier arm64_get_spectre_v4_state() == SPECTRE_VULNERABLE) { 171813aeb9b4SDavid Brazdil kvm_call_hyp_nvhe(__kvm_enable_ssbs); 171971b3ec5fSDavid Brazdil } 17209ed24f4bSMarc Zyngier } 17219ed24f4bSMarc Zyngier 17229ed24f4bSMarc Zyngier static void cpu_hyp_reset(void) 17239ed24f4bSMarc Zyngier { 17249ed24f4bSMarc Zyngier if (!is_kernel_in_hyp_mode()) 17259ed24f4bSMarc Zyngier __hyp_reset_vectors(); 17269ed24f4bSMarc Zyngier } 17279ed24f4bSMarc Zyngier 1728042c76a9SWill Deacon /* 1729042c76a9SWill Deacon * EL2 vectors can be mapped and rerouted in a number of ways, 1730042c76a9SWill Deacon * depending on the kernel configuration and CPU present: 1731042c76a9SWill Deacon * 1732042c76a9SWill Deacon * - If the CPU is affected by Spectre-v2, the hardening sequence is 1733042c76a9SWill Deacon * placed in one of the vector slots, which is executed before jumping 1734042c76a9SWill Deacon * to the real vectors. 1735042c76a9SWill Deacon * 1736c4792b6dSWill Deacon * - If the CPU also has the ARM64_SPECTRE_V3A cap, the slot 1737042c76a9SWill Deacon * containing the hardening sequence is mapped next to the idmap page, 1738042c76a9SWill Deacon * and executed before jumping to the real vectors. 1739042c76a9SWill Deacon * 1740c4792b6dSWill Deacon * - If the CPU only has the ARM64_SPECTRE_V3A cap, then an 1741042c76a9SWill Deacon * empty slot is selected, mapped next to the idmap page, and 1742042c76a9SWill Deacon * executed before jumping to the real vectors. 1743042c76a9SWill Deacon * 1744c4792b6dSWill Deacon * Note that ARM64_SPECTRE_V3A is somewhat incompatible with 1745042c76a9SWill Deacon * VHE, as we don't have hypervisor-specific mappings. If the system 1746042c76a9SWill Deacon * is VHE and yet selects this capability, it will be ignored. 1747042c76a9SWill Deacon */ 1748042c76a9SWill Deacon static void cpu_set_hyp_vector(void) 1749042c76a9SWill Deacon { 17506279017eSWill Deacon struct bp_hardening_data *data = this_cpu_ptr(&bp_hardening_data); 1751b881cdceSWill Deacon void *vector = hyp_spectre_vector_selector[data->slot]; 1752042c76a9SWill Deacon 1753bfa79a80SQuentin Perret if (!is_protected_kvm_enabled()) 1754b881cdceSWill Deacon *this_cpu_ptr_hyp_sym(kvm_hyp_vector) = (unsigned long)vector; 1755bfa79a80SQuentin Perret else 1756bfa79a80SQuentin Perret kvm_call_hyp_nvhe(__pkvm_cpu_set_vector, data->slot); 1757042c76a9SWill Deacon } 1758042c76a9SWill Deacon 17598579a185SWill Deacon static void cpu_hyp_init_context(void) 17609ed24f4bSMarc Zyngier { 17612a1198c9SDavid Brazdil kvm_init_host_cpu_context(&this_cpu_ptr_hyp_sym(kvm_host_data)->host_ctxt); 17629ed24f4bSMarc Zyngier 17638579a185SWill Deacon if (!is_kernel_in_hyp_mode()) 17648579a185SWill Deacon cpu_init_hyp_mode(); 17658579a185SWill Deacon } 17668579a185SWill Deacon 17678579a185SWill Deacon static void cpu_hyp_init_features(void) 17688579a185SWill Deacon { 17698579a185SWill Deacon cpu_set_hyp_vector(); 17708579a185SWill Deacon kvm_arm_init_debug(); 1771a0e47952SAndrew Scull 17729ed24f4bSMarc Zyngier if (is_kernel_in_hyp_mode()) 17739ed24f4bSMarc Zyngier kvm_timer_init_vhe(); 17749ed24f4bSMarc Zyngier 17759ed24f4bSMarc Zyngier if (vgic_present) 17769ed24f4bSMarc Zyngier kvm_vgic_init_cpu_hardware(); 17779ed24f4bSMarc Zyngier } 17789ed24f4bSMarc Zyngier 17798579a185SWill Deacon static void cpu_hyp_reinit(void) 17808579a185SWill Deacon { 17818579a185SWill Deacon cpu_hyp_reset(); 17828579a185SWill Deacon cpu_hyp_init_context(); 17838579a185SWill Deacon cpu_hyp_init_features(); 17848579a185SWill Deacon } 17858579a185SWill Deacon 17869ed24f4bSMarc Zyngier static void _kvm_arch_hardware_enable(void *discard) 17879ed24f4bSMarc Zyngier { 17889ed24f4bSMarc Zyngier if (!__this_cpu_read(kvm_arm_hardware_enabled)) { 17899ed24f4bSMarc Zyngier cpu_hyp_reinit(); 17909ed24f4bSMarc Zyngier __this_cpu_write(kvm_arm_hardware_enabled, 1); 17919ed24f4bSMarc Zyngier } 17929ed24f4bSMarc Zyngier } 17939ed24f4bSMarc Zyngier 17949ed24f4bSMarc Zyngier int kvm_arch_hardware_enable(void) 17959ed24f4bSMarc Zyngier { 1796466d27e4SMarc Zyngier int was_enabled = __this_cpu_read(kvm_arm_hardware_enabled); 1797466d27e4SMarc Zyngier 17989ed24f4bSMarc Zyngier _kvm_arch_hardware_enable(NULL); 1799466d27e4SMarc Zyngier 1800466d27e4SMarc Zyngier if (!was_enabled) { 1801466d27e4SMarc Zyngier kvm_vgic_cpu_up(); 1802466d27e4SMarc Zyngier kvm_timer_cpu_up(); 1803466d27e4SMarc Zyngier } 1804466d27e4SMarc Zyngier 18059ed24f4bSMarc Zyngier return 0; 18069ed24f4bSMarc Zyngier } 18079ed24f4bSMarc Zyngier 18089ed24f4bSMarc Zyngier static void _kvm_arch_hardware_disable(void *discard) 18099ed24f4bSMarc Zyngier { 18109ed24f4bSMarc Zyngier if (__this_cpu_read(kvm_arm_hardware_enabled)) { 18119ed24f4bSMarc Zyngier cpu_hyp_reset(); 18129ed24f4bSMarc Zyngier __this_cpu_write(kvm_arm_hardware_enabled, 0); 18139ed24f4bSMarc Zyngier } 18149ed24f4bSMarc Zyngier } 18159ed24f4bSMarc Zyngier 18169ed24f4bSMarc Zyngier void kvm_arch_hardware_disable(void) 18179ed24f4bSMarc Zyngier { 1818466d27e4SMarc Zyngier if (__this_cpu_read(kvm_arm_hardware_enabled)) { 1819466d27e4SMarc Zyngier kvm_timer_cpu_down(); 1820466d27e4SMarc Zyngier kvm_vgic_cpu_down(); 1821466d27e4SMarc Zyngier } 1822466d27e4SMarc Zyngier 1823fa8c3d65SDavid Brazdil if (!is_protected_kvm_enabled()) 18249ed24f4bSMarc Zyngier _kvm_arch_hardware_disable(NULL); 18259ed24f4bSMarc Zyngier } 18269ed24f4bSMarc Zyngier 18279ed24f4bSMarc Zyngier #ifdef CONFIG_CPU_PM 18289ed24f4bSMarc Zyngier static int hyp_init_cpu_pm_notifier(struct notifier_block *self, 18299ed24f4bSMarc Zyngier unsigned long cmd, 18309ed24f4bSMarc Zyngier void *v) 18319ed24f4bSMarc Zyngier { 18329ed24f4bSMarc Zyngier /* 18339ed24f4bSMarc Zyngier * kvm_arm_hardware_enabled is left with its old value over 18349ed24f4bSMarc Zyngier * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should 18359ed24f4bSMarc Zyngier * re-enable hyp. 18369ed24f4bSMarc Zyngier */ 18379ed24f4bSMarc Zyngier switch (cmd) { 18389ed24f4bSMarc Zyngier case CPU_PM_ENTER: 18399ed24f4bSMarc Zyngier if (__this_cpu_read(kvm_arm_hardware_enabled)) 18409ed24f4bSMarc Zyngier /* 18419ed24f4bSMarc Zyngier * don't update kvm_arm_hardware_enabled here 18429ed24f4bSMarc Zyngier * so that the hardware will be re-enabled 18439ed24f4bSMarc Zyngier * when we resume. See below. 18449ed24f4bSMarc Zyngier */ 18459ed24f4bSMarc Zyngier cpu_hyp_reset(); 18469ed24f4bSMarc Zyngier 18479ed24f4bSMarc Zyngier return NOTIFY_OK; 18489ed24f4bSMarc Zyngier case CPU_PM_ENTER_FAILED: 18499ed24f4bSMarc Zyngier case CPU_PM_EXIT: 18509ed24f4bSMarc Zyngier if (__this_cpu_read(kvm_arm_hardware_enabled)) 18519ed24f4bSMarc Zyngier /* The hardware was enabled before suspend. */ 18529ed24f4bSMarc Zyngier cpu_hyp_reinit(); 18539ed24f4bSMarc Zyngier 18549ed24f4bSMarc Zyngier return NOTIFY_OK; 18559ed24f4bSMarc Zyngier 18569ed24f4bSMarc Zyngier default: 18579ed24f4bSMarc Zyngier return NOTIFY_DONE; 18589ed24f4bSMarc Zyngier } 18599ed24f4bSMarc Zyngier } 18609ed24f4bSMarc Zyngier 18619ed24f4bSMarc Zyngier static struct notifier_block hyp_init_cpu_pm_nb = { 18629ed24f4bSMarc Zyngier .notifier_call = hyp_init_cpu_pm_notifier, 18639ed24f4bSMarc Zyngier }; 18649ed24f4bSMarc Zyngier 186553bf620aSSean Christopherson static void __init hyp_cpu_pm_init(void) 18669ed24f4bSMarc Zyngier { 1867fa8c3d65SDavid Brazdil if (!is_protected_kvm_enabled()) 18689ed24f4bSMarc Zyngier cpu_pm_register_notifier(&hyp_init_cpu_pm_nb); 18699ed24f4bSMarc Zyngier } 187053bf620aSSean Christopherson static void __init hyp_cpu_pm_exit(void) 18719ed24f4bSMarc Zyngier { 1872fa8c3d65SDavid Brazdil if (!is_protected_kvm_enabled()) 18739ed24f4bSMarc Zyngier cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb); 18749ed24f4bSMarc Zyngier } 18759ed24f4bSMarc Zyngier #else 187653bf620aSSean Christopherson static inline void __init hyp_cpu_pm_init(void) 18779ed24f4bSMarc Zyngier { 18789ed24f4bSMarc Zyngier } 187953bf620aSSean Christopherson static inline void __init hyp_cpu_pm_exit(void) 18809ed24f4bSMarc Zyngier { 18819ed24f4bSMarc Zyngier } 18829ed24f4bSMarc Zyngier #endif 18839ed24f4bSMarc Zyngier 188453bf620aSSean Christopherson static void __init init_cpu_logical_map(void) 188594f5e8a4SDavid Brazdil { 188694f5e8a4SDavid Brazdil unsigned int cpu; 188794f5e8a4SDavid Brazdil 188894f5e8a4SDavid Brazdil /* 188994f5e8a4SDavid Brazdil * Copy the MPIDR <-> logical CPU ID mapping to hyp. 189021ea4578SJulia Lawall * Only copy the set of online CPUs whose features have been checked 189194f5e8a4SDavid Brazdil * against the finalized system capabilities. The hypervisor will not 189294f5e8a4SDavid Brazdil * allow any other CPUs from the `possible` set to boot. 189394f5e8a4SDavid Brazdil */ 189494f5e8a4SDavid Brazdil for_each_online_cpu(cpu) 189561fe0c37SDavid Brazdil hyp_cpu_logical_map[cpu] = cpu_logical_map(cpu); 189694f5e8a4SDavid Brazdil } 189794f5e8a4SDavid Brazdil 1898767c973fSMarc Zyngier #define init_psci_0_1_impl_state(config, what) \ 1899767c973fSMarc Zyngier config.psci_0_1_ ## what ## _implemented = psci_ops.what 1900767c973fSMarc Zyngier 190153bf620aSSean Christopherson static bool __init init_psci_relay(void) 1902eeeee719SDavid Brazdil { 1903eeeee719SDavid Brazdil /* 1904eeeee719SDavid Brazdil * If PSCI has not been initialized, protected KVM cannot install 1905eeeee719SDavid Brazdil * itself on newly booted CPUs. 1906eeeee719SDavid Brazdil */ 1907eeeee719SDavid Brazdil if (!psci_ops.get_version) { 1908eeeee719SDavid Brazdil kvm_err("Cannot initialize protected mode without PSCI\n"); 1909eeeee719SDavid Brazdil return false; 1910eeeee719SDavid Brazdil } 1911eeeee719SDavid Brazdil 1912ff367fe4SDavid Brazdil kvm_host_psci_config.version = psci_ops.get_version(); 1913*12bdce4fSWill Deacon kvm_host_psci_config.smccc_version = arm_smccc_get_version(); 1914ff367fe4SDavid Brazdil 1915ff367fe4SDavid Brazdil if (kvm_host_psci_config.version == PSCI_VERSION(0, 1)) { 1916ff367fe4SDavid Brazdil kvm_host_psci_config.function_ids_0_1 = get_psci_0_1_function_ids(); 1917767c973fSMarc Zyngier init_psci_0_1_impl_state(kvm_host_psci_config, cpu_suspend); 1918767c973fSMarc Zyngier init_psci_0_1_impl_state(kvm_host_psci_config, cpu_on); 1919767c973fSMarc Zyngier init_psci_0_1_impl_state(kvm_host_psci_config, cpu_off); 1920767c973fSMarc Zyngier init_psci_0_1_impl_state(kvm_host_psci_config, migrate); 1921ff367fe4SDavid Brazdil } 1922eeeee719SDavid Brazdil return true; 1923eeeee719SDavid Brazdil } 1924eeeee719SDavid Brazdil 192553bf620aSSean Christopherson static int __init init_subsystems(void) 19269ed24f4bSMarc Zyngier { 19279ed24f4bSMarc Zyngier int err = 0; 19289ed24f4bSMarc Zyngier 19299ed24f4bSMarc Zyngier /* 19309ed24f4bSMarc Zyngier * Enable hardware so that subsystem initialisation can access EL2. 19319ed24f4bSMarc Zyngier */ 19329ed24f4bSMarc Zyngier on_each_cpu(_kvm_arch_hardware_enable, NULL, 1); 19339ed24f4bSMarc Zyngier 19349ed24f4bSMarc Zyngier /* 19359ed24f4bSMarc Zyngier * Register CPU lower-power notifier 19369ed24f4bSMarc Zyngier */ 19379ed24f4bSMarc Zyngier hyp_cpu_pm_init(); 19389ed24f4bSMarc Zyngier 19399ed24f4bSMarc Zyngier /* 19409ed24f4bSMarc Zyngier * Init HYP view of VGIC 19419ed24f4bSMarc Zyngier */ 19429ed24f4bSMarc Zyngier err = kvm_vgic_hyp_init(); 19439ed24f4bSMarc Zyngier switch (err) { 19449ed24f4bSMarc Zyngier case 0: 19459ed24f4bSMarc Zyngier vgic_present = true; 19469ed24f4bSMarc Zyngier break; 19479ed24f4bSMarc Zyngier case -ENODEV: 19489ed24f4bSMarc Zyngier case -ENXIO: 19499ed24f4bSMarc Zyngier vgic_present = false; 19509ed24f4bSMarc Zyngier err = 0; 19519ed24f4bSMarc Zyngier break; 19529ed24f4bSMarc Zyngier default: 19539ed24f4bSMarc Zyngier goto out; 19549ed24f4bSMarc Zyngier } 19559ed24f4bSMarc Zyngier 19569ed24f4bSMarc Zyngier /* 19579ed24f4bSMarc Zyngier * Init HYP architected timer support 19589ed24f4bSMarc Zyngier */ 19599ed24f4bSMarc Zyngier err = kvm_timer_hyp_init(vgic_present); 19609ed24f4bSMarc Zyngier if (err) 19619ed24f4bSMarc Zyngier goto out; 19629ed24f4bSMarc Zyngier 196317ed14ebSSean Christopherson kvm_register_perf_callbacks(NULL); 196417ed14ebSSean Christopherson 19659ed24f4bSMarc Zyngier out: 196678b3bf48SSean Christopherson if (err) 196778b3bf48SSean Christopherson hyp_cpu_pm_exit(); 196878b3bf48SSean Christopherson 1969fa8c3d65SDavid Brazdil if (err || !is_protected_kvm_enabled()) 19709ed24f4bSMarc Zyngier on_each_cpu(_kvm_arch_hardware_disable, NULL, 1); 19719ed24f4bSMarc Zyngier 19729ed24f4bSMarc Zyngier return err; 19739ed24f4bSMarc Zyngier } 19749ed24f4bSMarc Zyngier 197553bf620aSSean Christopherson static void __init teardown_subsystems(void) 197678b3bf48SSean Christopherson { 197778b3bf48SSean Christopherson kvm_unregister_perf_callbacks(); 197878b3bf48SSean Christopherson hyp_cpu_pm_exit(); 197978b3bf48SSean Christopherson } 198078b3bf48SSean Christopherson 198153bf620aSSean Christopherson static void __init teardown_hyp_mode(void) 19829ed24f4bSMarc Zyngier { 19839ed24f4bSMarc Zyngier int cpu; 19849ed24f4bSMarc Zyngier 19859ed24f4bSMarc Zyngier free_hyp_pgds(); 198630c95391SDavid Brazdil for_each_possible_cpu(cpu) { 19879ed24f4bSMarc Zyngier free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); 1988fe41a7f8SQuentin Perret free_pages(kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu], nvhe_percpu_order()); 198930c95391SDavid Brazdil } 19909ed24f4bSMarc Zyngier } 19919ed24f4bSMarc Zyngier 199253bf620aSSean Christopherson static int __init do_pkvm_init(u32 hyp_va_bits) 1993bfa79a80SQuentin Perret { 1994fe41a7f8SQuentin Perret void *per_cpu_base = kvm_ksym_ref(kvm_nvhe_sym(kvm_arm_hyp_percpu_base)); 1995bfa79a80SQuentin Perret int ret; 1996bfa79a80SQuentin Perret 1997bfa79a80SQuentin Perret preempt_disable(); 19988579a185SWill Deacon cpu_hyp_init_context(); 1999bfa79a80SQuentin Perret ret = kvm_call_hyp_nvhe(__pkvm_init, hyp_mem_base, hyp_mem_size, 2000bfa79a80SQuentin Perret num_possible_cpus(), kern_hyp_va(per_cpu_base), 2001bfa79a80SQuentin Perret hyp_va_bits); 20028579a185SWill Deacon cpu_hyp_init_features(); 20038579a185SWill Deacon 20048579a185SWill Deacon /* 20058579a185SWill Deacon * The stub hypercalls are now disabled, so set our local flag to 20068579a185SWill Deacon * prevent a later re-init attempt in kvm_arch_hardware_enable(). 20078579a185SWill Deacon */ 20088579a185SWill Deacon __this_cpu_write(kvm_arm_hardware_enabled, 1); 2009bfa79a80SQuentin Perret preempt_enable(); 2010bfa79a80SQuentin Perret 2011bfa79a80SQuentin Perret return ret; 2012bfa79a80SQuentin Perret } 2013bfa79a80SQuentin Perret 2014e8162521SFuad Tabba static u64 get_hyp_id_aa64pfr0_el1(void) 2015e8162521SFuad Tabba { 2016e8162521SFuad Tabba /* 2017e8162521SFuad Tabba * Track whether the system isn't affected by spectre/meltdown in the 2018e8162521SFuad Tabba * hypervisor's view of id_aa64pfr0_el1, used for protected VMs. 2019e8162521SFuad Tabba * Although this is per-CPU, we make it global for simplicity, e.g., not 2020e8162521SFuad Tabba * to have to worry about vcpu migration. 2021e8162521SFuad Tabba * 2022e8162521SFuad Tabba * Unlike for non-protected VMs, userspace cannot override this for 2023e8162521SFuad Tabba * protected VMs. 2024e8162521SFuad Tabba */ 2025e8162521SFuad Tabba u64 val = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1); 2026e8162521SFuad Tabba 2027e8162521SFuad Tabba val &= ~(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2) | 2028e8162521SFuad Tabba ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3)); 2029e8162521SFuad Tabba 2030e8162521SFuad Tabba val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2), 2031e8162521SFuad Tabba arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED); 2032e8162521SFuad Tabba val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3), 2033e8162521SFuad Tabba arm64_get_meltdown_state() == SPECTRE_UNAFFECTED); 2034e8162521SFuad Tabba 2035e8162521SFuad Tabba return val; 2036e8162521SFuad Tabba } 2037e8162521SFuad Tabba 20386c165223SWill Deacon static void kvm_hyp_init_symbols(void) 2039bfa79a80SQuentin Perret { 2040e8162521SFuad Tabba kvm_nvhe_sym(id_aa64pfr0_el1_sys_val) = get_hyp_id_aa64pfr0_el1(); 20416c30bfb1SFuad Tabba kvm_nvhe_sym(id_aa64pfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1); 20426c30bfb1SFuad Tabba kvm_nvhe_sym(id_aa64isar0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR0_EL1); 20436c30bfb1SFuad Tabba kvm_nvhe_sym(id_aa64isar1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR1_EL1); 2044def8c222SVladimir Murzin kvm_nvhe_sym(id_aa64isar2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR2_EL1); 20457c419937SMarc Zyngier kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1); 20467c419937SMarc Zyngier kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1); 20476c30bfb1SFuad Tabba kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR2_EL1); 20488669651cSQuentin Perret kvm_nvhe_sym(id_aa64smfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64SMFR0_EL1); 204913e248aaSWill Deacon kvm_nvhe_sym(__icache_flags) = __icache_flags; 205073f38ef2SWill Deacon kvm_nvhe_sym(kvm_arm_vmid_bits) = kvm_arm_vmid_bits; 20516c165223SWill Deacon } 20526c165223SWill Deacon 205353bf620aSSean Christopherson static int __init kvm_hyp_init_protection(u32 hyp_va_bits) 20546c165223SWill Deacon { 20556c165223SWill Deacon void *addr = phys_to_virt(hyp_mem_base); 20566c165223SWill Deacon int ret; 20577c419937SMarc Zyngier 2058bfa79a80SQuentin Perret ret = create_hyp_mappings(addr, addr + hyp_mem_size, PAGE_HYP); 2059bfa79a80SQuentin Perret if (ret) 2060bfa79a80SQuentin Perret return ret; 2061bfa79a80SQuentin Perret 2062bfa79a80SQuentin Perret ret = do_pkvm_init(hyp_va_bits); 2063bfa79a80SQuentin Perret if (ret) 2064bfa79a80SQuentin Perret return ret; 2065bfa79a80SQuentin Perret 2066bfa79a80SQuentin Perret free_hyp_pgds(); 2067bfa79a80SQuentin Perret 2068bfa79a80SQuentin Perret return 0; 2069bfa79a80SQuentin Perret } 2070bfa79a80SQuentin Perret 207167d953d4SMarc Zyngier /* Inits Hyp-mode on all online CPUs */ 207253bf620aSSean Christopherson static int __init init_hyp_mode(void) 20739ed24f4bSMarc Zyngier { 2074bfa79a80SQuentin Perret u32 hyp_va_bits; 20759ed24f4bSMarc Zyngier int cpu; 2076bfa79a80SQuentin Perret int err = -ENOMEM; 2077bfa79a80SQuentin Perret 2078bfa79a80SQuentin Perret /* 2079bfa79a80SQuentin Perret * The protected Hyp-mode cannot be initialized if the memory pool 2080bfa79a80SQuentin Perret * allocation has failed. 2081bfa79a80SQuentin Perret */ 2082bfa79a80SQuentin Perret if (is_protected_kvm_enabled() && !hyp_mem_base) 2083bfa79a80SQuentin Perret goto out_err; 20849ed24f4bSMarc Zyngier 20859ed24f4bSMarc Zyngier /* 20869ed24f4bSMarc Zyngier * Allocate Hyp PGD and setup Hyp identity mapping 20879ed24f4bSMarc Zyngier */ 2088bfa79a80SQuentin Perret err = kvm_mmu_init(&hyp_va_bits); 20899ed24f4bSMarc Zyngier if (err) 20909ed24f4bSMarc Zyngier goto out_err; 20919ed24f4bSMarc Zyngier 20929ed24f4bSMarc Zyngier /* 20939ed24f4bSMarc Zyngier * Allocate stack pages for Hypervisor-mode 20949ed24f4bSMarc Zyngier */ 20959ed24f4bSMarc Zyngier for_each_possible_cpu(cpu) { 20969ed24f4bSMarc Zyngier unsigned long stack_page; 20979ed24f4bSMarc Zyngier 20989ed24f4bSMarc Zyngier stack_page = __get_free_page(GFP_KERNEL); 20999ed24f4bSMarc Zyngier if (!stack_page) { 21009ed24f4bSMarc Zyngier err = -ENOMEM; 21019ed24f4bSMarc Zyngier goto out_err; 21029ed24f4bSMarc Zyngier } 21039ed24f4bSMarc Zyngier 21049ed24f4bSMarc Zyngier per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; 21059ed24f4bSMarc Zyngier } 21069ed24f4bSMarc Zyngier 21079ed24f4bSMarc Zyngier /* 210830c95391SDavid Brazdil * Allocate and initialize pages for Hypervisor-mode percpu regions. 210930c95391SDavid Brazdil */ 211030c95391SDavid Brazdil for_each_possible_cpu(cpu) { 211130c95391SDavid Brazdil struct page *page; 211230c95391SDavid Brazdil void *page_addr; 211330c95391SDavid Brazdil 211430c95391SDavid Brazdil page = alloc_pages(GFP_KERNEL, nvhe_percpu_order()); 211530c95391SDavid Brazdil if (!page) { 211630c95391SDavid Brazdil err = -ENOMEM; 211730c95391SDavid Brazdil goto out_err; 211830c95391SDavid Brazdil } 211930c95391SDavid Brazdil 212030c95391SDavid Brazdil page_addr = page_address(page); 212130c95391SDavid Brazdil memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size()); 2122fe41a7f8SQuentin Perret kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu] = (unsigned long)page_addr; 212330c95391SDavid Brazdil } 212430c95391SDavid Brazdil 212530c95391SDavid Brazdil /* 21269ed24f4bSMarc Zyngier * Map the Hyp-code called directly from the host 21279ed24f4bSMarc Zyngier */ 21289ed24f4bSMarc Zyngier err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start), 21299ed24f4bSMarc Zyngier kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC); 21309ed24f4bSMarc Zyngier if (err) { 21319ed24f4bSMarc Zyngier kvm_err("Cannot map world-switch code\n"); 21329ed24f4bSMarc Zyngier goto out_err; 21339ed24f4bSMarc Zyngier } 21349ed24f4bSMarc Zyngier 213516174eeaSDavid Brazdil err = create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start), 213616174eeaSDavid Brazdil kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO); 21372d7bf218SDavid Brazdil if (err) { 213816174eeaSDavid Brazdil kvm_err("Cannot map .hyp.rodata section\n"); 21392d7bf218SDavid Brazdil goto out_err; 21402d7bf218SDavid Brazdil } 21412d7bf218SDavid Brazdil 21429ed24f4bSMarc Zyngier err = create_hyp_mappings(kvm_ksym_ref(__start_rodata), 21439ed24f4bSMarc Zyngier kvm_ksym_ref(__end_rodata), PAGE_HYP_RO); 21449ed24f4bSMarc Zyngier if (err) { 21459ed24f4bSMarc Zyngier kvm_err("Cannot map rodata section\n"); 21469ed24f4bSMarc Zyngier goto out_err; 21479ed24f4bSMarc Zyngier } 21489ed24f4bSMarc Zyngier 2149380e18adSQuentin Perret /* 2150380e18adSQuentin Perret * .hyp.bss is guaranteed to be placed at the beginning of the .bss 2151380e18adSQuentin Perret * section thanks to an assertion in the linker script. Map it RW and 2152380e18adSQuentin Perret * the rest of .bss RO. 2153380e18adSQuentin Perret */ 2154380e18adSQuentin Perret err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_start), 2155380e18adSQuentin Perret kvm_ksym_ref(__hyp_bss_end), PAGE_HYP); 2156380e18adSQuentin Perret if (err) { 2157380e18adSQuentin Perret kvm_err("Cannot map hyp bss section: %d\n", err); 2158380e18adSQuentin Perret goto out_err; 2159380e18adSQuentin Perret } 2160380e18adSQuentin Perret 2161380e18adSQuentin Perret err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_end), 21629ed24f4bSMarc Zyngier kvm_ksym_ref(__bss_stop), PAGE_HYP_RO); 21639ed24f4bSMarc Zyngier if (err) { 21649ed24f4bSMarc Zyngier kvm_err("Cannot map bss section\n"); 21659ed24f4bSMarc Zyngier goto out_err; 21669ed24f4bSMarc Zyngier } 21679ed24f4bSMarc Zyngier 21689ed24f4bSMarc Zyngier /* 21699ed24f4bSMarc Zyngier * Map the Hyp stack pages 21709ed24f4bSMarc Zyngier */ 21719ed24f4bSMarc Zyngier for_each_possible_cpu(cpu) { 2172ce335431SKalesh Singh struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu); 21739ed24f4bSMarc Zyngier char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); 2174ce335431SKalesh Singh unsigned long hyp_addr; 21759ed24f4bSMarc Zyngier 2176ce335431SKalesh Singh /* 2177ce335431SKalesh Singh * Allocate a contiguous HYP private VA range for the stack 2178ce335431SKalesh Singh * and guard page. The allocation is also aligned based on 2179ce335431SKalesh Singh * the order of its size. 2180ce335431SKalesh Singh */ 2181ce335431SKalesh Singh err = hyp_alloc_private_va_range(PAGE_SIZE * 2, &hyp_addr); 2182ce335431SKalesh Singh if (err) { 2183ce335431SKalesh Singh kvm_err("Cannot allocate hyp stack guard page\n"); 2184ce335431SKalesh Singh goto out_err; 2185ce335431SKalesh Singh } 2186ce335431SKalesh Singh 2187ce335431SKalesh Singh /* 2188ce335431SKalesh Singh * Since the stack grows downwards, map the stack to the page 2189ce335431SKalesh Singh * at the higher address and leave the lower guard page 2190ce335431SKalesh Singh * unbacked. 2191ce335431SKalesh Singh * 2192ce335431SKalesh Singh * Any valid stack address now has the PAGE_SHIFT bit as 1 2193ce335431SKalesh Singh * and addresses corresponding to the guard page have the 2194ce335431SKalesh Singh * PAGE_SHIFT bit as 0 - this is used for overflow detection. 2195ce335431SKalesh Singh */ 2196ce335431SKalesh Singh err = __create_hyp_mappings(hyp_addr + PAGE_SIZE, PAGE_SIZE, 2197ce335431SKalesh Singh __pa(stack_page), PAGE_HYP); 21989ed24f4bSMarc Zyngier if (err) { 21999ed24f4bSMarc Zyngier kvm_err("Cannot map hyp stack\n"); 22009ed24f4bSMarc Zyngier goto out_err; 22019ed24f4bSMarc Zyngier } 2202ce335431SKalesh Singh 2203ce335431SKalesh Singh /* 2204ce335431SKalesh Singh * Save the stack PA in nvhe_init_params. This will be needed 2205ce335431SKalesh Singh * to recreate the stack mapping in protected nVHE mode. 2206ce335431SKalesh Singh * __hyp_pa() won't do the right thing there, since the stack 2207ce335431SKalesh Singh * has been mapped in the flexible private VA space. 2208ce335431SKalesh Singh */ 2209ce335431SKalesh Singh params->stack_pa = __pa(stack_page); 2210ce335431SKalesh Singh 2211ce335431SKalesh Singh params->stack_hyp_va = hyp_addr + (2 * PAGE_SIZE); 22129ed24f4bSMarc Zyngier } 22139ed24f4bSMarc Zyngier 22149ed24f4bSMarc Zyngier for_each_possible_cpu(cpu) { 2215fe41a7f8SQuentin Perret char *percpu_begin = (char *)kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu]; 221630c95391SDavid Brazdil char *percpu_end = percpu_begin + nvhe_percpu_size(); 22179ed24f4bSMarc Zyngier 22189cc77581SQuentin Perret /* Map Hyp percpu pages */ 221930c95391SDavid Brazdil err = create_hyp_mappings(percpu_begin, percpu_end, PAGE_HYP); 22209ed24f4bSMarc Zyngier if (err) { 222130c95391SDavid Brazdil kvm_err("Cannot map hyp percpu region\n"); 22226e3bfbb2SAndrew Scull goto out_err; 22236e3bfbb2SAndrew Scull } 22249cc77581SQuentin Perret 22259cc77581SQuentin Perret /* Prepare the CPU initialization parameters */ 2226579d7ebeSRyan Roberts cpu_prepare_hyp_mode(cpu, hyp_va_bits); 22279ed24f4bSMarc Zyngier } 22289ed24f4bSMarc Zyngier 22296c165223SWill Deacon kvm_hyp_init_symbols(); 22306c165223SWill Deacon 2231eeeee719SDavid Brazdil if (is_protected_kvm_enabled()) { 223294f5e8a4SDavid Brazdil init_cpu_logical_map(); 223394f5e8a4SDavid Brazdil 223452b9e265SWang Wensheng if (!init_psci_relay()) { 223552b9e265SWang Wensheng err = -ENODEV; 2236eeeee719SDavid Brazdil goto out_err; 2237eeeee719SDavid Brazdil } 2238eeeee719SDavid Brazdil 2239bfa79a80SQuentin Perret err = kvm_hyp_init_protection(hyp_va_bits); 2240bfa79a80SQuentin Perret if (err) { 2241bfa79a80SQuentin Perret kvm_err("Failed to init hyp memory protection\n"); 2242bfa79a80SQuentin Perret goto out_err; 2243bfa79a80SQuentin Perret } 2244bfa79a80SQuentin Perret } 22459ed24f4bSMarc Zyngier 22469ed24f4bSMarc Zyngier return 0; 22479ed24f4bSMarc Zyngier 22489ed24f4bSMarc Zyngier out_err: 22499ed24f4bSMarc Zyngier teardown_hyp_mode(); 22509ed24f4bSMarc Zyngier kvm_err("error initializing Hyp mode: %d\n", err); 22519ed24f4bSMarc Zyngier return err; 22529ed24f4bSMarc Zyngier } 22539ed24f4bSMarc Zyngier 22549ed24f4bSMarc Zyngier struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr) 22559ed24f4bSMarc Zyngier { 22569ed24f4bSMarc Zyngier struct kvm_vcpu *vcpu; 225746808a4cSMarc Zyngier unsigned long i; 22589ed24f4bSMarc Zyngier 22599ed24f4bSMarc Zyngier mpidr &= MPIDR_HWID_BITMASK; 22609ed24f4bSMarc Zyngier kvm_for_each_vcpu(i, vcpu, kvm) { 22619ed24f4bSMarc Zyngier if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu)) 22629ed24f4bSMarc Zyngier return vcpu; 22639ed24f4bSMarc Zyngier } 22649ed24f4bSMarc Zyngier return NULL; 22659ed24f4bSMarc Zyngier } 22669ed24f4bSMarc Zyngier 2267d663b8a2SPaolo Bonzini bool kvm_arch_irqchip_in_kernel(struct kvm *kvm) 2268d663b8a2SPaolo Bonzini { 2269d663b8a2SPaolo Bonzini return irqchip_in_kernel(kvm); 2270d663b8a2SPaolo Bonzini } 2271d663b8a2SPaolo Bonzini 22729ed24f4bSMarc Zyngier bool kvm_arch_has_irq_bypass(void) 22739ed24f4bSMarc Zyngier { 22749ed24f4bSMarc Zyngier return true; 22759ed24f4bSMarc Zyngier } 22769ed24f4bSMarc Zyngier 22779ed24f4bSMarc Zyngier int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons, 22789ed24f4bSMarc Zyngier struct irq_bypass_producer *prod) 22799ed24f4bSMarc Zyngier { 22809ed24f4bSMarc Zyngier struct kvm_kernel_irqfd *irqfd = 22819ed24f4bSMarc Zyngier container_of(cons, struct kvm_kernel_irqfd, consumer); 22829ed24f4bSMarc Zyngier 22839ed24f4bSMarc Zyngier return kvm_vgic_v4_set_forwarding(irqfd->kvm, prod->irq, 22849ed24f4bSMarc Zyngier &irqfd->irq_entry); 22859ed24f4bSMarc Zyngier } 22869ed24f4bSMarc Zyngier void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons, 22879ed24f4bSMarc Zyngier struct irq_bypass_producer *prod) 22889ed24f4bSMarc Zyngier { 22899ed24f4bSMarc Zyngier struct kvm_kernel_irqfd *irqfd = 22909ed24f4bSMarc Zyngier container_of(cons, struct kvm_kernel_irqfd, consumer); 22919ed24f4bSMarc Zyngier 22929ed24f4bSMarc Zyngier kvm_vgic_v4_unset_forwarding(irqfd->kvm, prod->irq, 22939ed24f4bSMarc Zyngier &irqfd->irq_entry); 22949ed24f4bSMarc Zyngier } 22959ed24f4bSMarc Zyngier 22969ed24f4bSMarc Zyngier void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons) 22979ed24f4bSMarc Zyngier { 22989ed24f4bSMarc Zyngier struct kvm_kernel_irqfd *irqfd = 22999ed24f4bSMarc Zyngier container_of(cons, struct kvm_kernel_irqfd, consumer); 23009ed24f4bSMarc Zyngier 23019ed24f4bSMarc Zyngier kvm_arm_halt_guest(irqfd->kvm); 23029ed24f4bSMarc Zyngier } 23039ed24f4bSMarc Zyngier 23049ed24f4bSMarc Zyngier void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons) 23059ed24f4bSMarc Zyngier { 23069ed24f4bSMarc Zyngier struct kvm_kernel_irqfd *irqfd = 23079ed24f4bSMarc Zyngier container_of(cons, struct kvm_kernel_irqfd, consumer); 23089ed24f4bSMarc Zyngier 23099ed24f4bSMarc Zyngier kvm_arm_resume_guest(irqfd->kvm); 23109ed24f4bSMarc Zyngier } 23119ed24f4bSMarc Zyngier 231267d953d4SMarc Zyngier /* Initialize Hyp-mode and memory mappings on all CPUs */ 231353bf620aSSean Christopherson static __init int kvm_arm_init(void) 23149ed24f4bSMarc Zyngier { 23159ed24f4bSMarc Zyngier int err; 23169ed24f4bSMarc Zyngier bool in_hyp_mode; 23179ed24f4bSMarc Zyngier 23189ed24f4bSMarc Zyngier if (!is_hyp_mode_available()) { 23199ed24f4bSMarc Zyngier kvm_info("HYP mode not available\n"); 23209ed24f4bSMarc Zyngier return -ENODEV; 23219ed24f4bSMarc Zyngier } 23229ed24f4bSMarc Zyngier 2323b6a68b97SMarc Zyngier if (kvm_get_mode() == KVM_MODE_NONE) { 2324b6a68b97SMarc Zyngier kvm_info("KVM disabled from command line\n"); 2325b6a68b97SMarc Zyngier return -ENODEV; 2326b6a68b97SMarc Zyngier } 2327b6a68b97SMarc Zyngier 2328f1f0c0cfSAlexandru Elisei err = kvm_sys_reg_table_init(); 2329f1f0c0cfSAlexandru Elisei if (err) { 2330f1f0c0cfSAlexandru Elisei kvm_info("Error initializing system register tables"); 2331f1f0c0cfSAlexandru Elisei return err; 2332f1f0c0cfSAlexandru Elisei } 2333f1f0c0cfSAlexandru Elisei 23349ed24f4bSMarc Zyngier in_hyp_mode = is_kernel_in_hyp_mode(); 23359ed24f4bSMarc Zyngier 233696d389caSRob Herring if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) || 233796d389caSRob Herring cpus_have_final_cap(ARM64_WORKAROUND_1508412)) 2338abf532ccSRob Herring kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \ 2339abf532ccSRob Herring "Only trusted guests should be used on this system.\n"); 2340abf532ccSRob Herring 2341bf249d9eSAnshuman Khandual err = kvm_set_ipa_limit(); 23429ed24f4bSMarc Zyngier if (err) 23439ed24f4bSMarc Zyngier return err; 23449ed24f4bSMarc Zyngier 23459ed24f4bSMarc Zyngier err = kvm_arm_init_sve(); 23469ed24f4bSMarc Zyngier if (err) 23479ed24f4bSMarc Zyngier return err; 23489ed24f4bSMarc Zyngier 23493248136bSJulien Grall err = kvm_arm_vmid_alloc_init(); 23503248136bSJulien Grall if (err) { 23513248136bSJulien Grall kvm_err("Failed to initialize VMID allocator.\n"); 23523248136bSJulien Grall return err; 23533248136bSJulien Grall } 23543248136bSJulien Grall 23559ed24f4bSMarc Zyngier if (!in_hyp_mode) { 23569ed24f4bSMarc Zyngier err = init_hyp_mode(); 23579ed24f4bSMarc Zyngier if (err) 23589ed24f4bSMarc Zyngier goto out_err; 23599ed24f4bSMarc Zyngier } 23609ed24f4bSMarc Zyngier 2361b881cdceSWill Deacon err = kvm_init_vector_slots(); 2362b881cdceSWill Deacon if (err) { 2363b881cdceSWill Deacon kvm_err("Cannot initialise vector slots\n"); 23646baaeda8SSean Christopherson goto out_hyp; 2365b881cdceSWill Deacon } 2366b881cdceSWill Deacon 23679ed24f4bSMarc Zyngier err = init_subsystems(); 23689ed24f4bSMarc Zyngier if (err) 236978b3bf48SSean Christopherson goto out_hyp; 23709ed24f4bSMarc Zyngier 2371f19f6644SDavid Brazdil if (is_protected_kvm_enabled()) { 23723eb681fbSDavid Brazdil kvm_info("Protected nVHE mode initialized successfully\n"); 2373f19f6644SDavid Brazdil } else if (in_hyp_mode) { 23749ed24f4bSMarc Zyngier kvm_info("VHE mode initialized successfully\n"); 2375f19f6644SDavid Brazdil } else { 23769ed24f4bSMarc Zyngier kvm_info("Hyp mode initialized successfully\n"); 2377f19f6644SDavid Brazdil } 23789ed24f4bSMarc Zyngier 23791dc0f02dSSean Christopherson /* 23801dc0f02dSSean Christopherson * FIXME: Do something reasonable if kvm_init() fails after pKVM 23811dc0f02dSSean Christopherson * hypervisor protection is finalized. 23821dc0f02dSSean Christopherson */ 238381a1cf9fSSean Christopherson err = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE); 23841dc0f02dSSean Christopherson if (err) 23851dc0f02dSSean Christopherson goto out_subs; 23861dc0f02dSSean Christopherson 23879ed24f4bSMarc Zyngier return 0; 23889ed24f4bSMarc Zyngier 23896baaeda8SSean Christopherson out_subs: 239078b3bf48SSean Christopherson teardown_subsystems(); 23916baaeda8SSean Christopherson out_hyp: 23929ed24f4bSMarc Zyngier if (!in_hyp_mode) 23939ed24f4bSMarc Zyngier teardown_hyp_mode(); 23949ed24f4bSMarc Zyngier out_err: 23953248136bSJulien Grall kvm_arm_vmid_alloc_free(); 23969ed24f4bSMarc Zyngier return err; 23979ed24f4bSMarc Zyngier } 23989ed24f4bSMarc Zyngier 2399d8b369c4SDavid Brazdil static int __init early_kvm_mode_cfg(char *arg) 2400d8b369c4SDavid Brazdil { 2401d8b369c4SDavid Brazdil if (!arg) 2402d8b369c4SDavid Brazdil return -EINVAL; 2403d8b369c4SDavid Brazdil 2404b2a4d007SElliot Berman if (strcmp(arg, "none") == 0) { 2405b2a4d007SElliot Berman kvm_mode = KVM_MODE_NONE; 2406b2a4d007SElliot Berman return 0; 2407b2a4d007SElliot Berman } 2408b2a4d007SElliot Berman 2409b2a4d007SElliot Berman if (!is_hyp_mode_available()) { 2410b2a4d007SElliot Berman pr_warn_once("KVM is not available. Ignoring kvm-arm.mode\n"); 2411b2a4d007SElliot Berman return 0; 2412b2a4d007SElliot Berman } 2413b2a4d007SElliot Berman 2414d8b369c4SDavid Brazdil if (strcmp(arg, "protected") == 0) { 2415cde5042aSWill Deacon if (!is_kernel_in_hyp_mode()) 2416d8b369c4SDavid Brazdil kvm_mode = KVM_MODE_PROTECTED; 2417cde5042aSWill Deacon else 2418cde5042aSWill Deacon pr_warn_once("Protected KVM not available with VHE\n"); 2419cde5042aSWill Deacon 2420d8b369c4SDavid Brazdil return 0; 2421d8b369c4SDavid Brazdil } 2422d8b369c4SDavid Brazdil 2423b6a68b97SMarc Zyngier if (strcmp(arg, "nvhe") == 0 && !WARN_ON(is_kernel_in_hyp_mode())) { 2424b6a68b97SMarc Zyngier kvm_mode = KVM_MODE_DEFAULT; 24251945a067SMarc Zyngier return 0; 2426b6a68b97SMarc Zyngier } 2427b6a68b97SMarc Zyngier 2428675cabc8SJintack Lim if (strcmp(arg, "nested") == 0 && !WARN_ON(!is_kernel_in_hyp_mode())) { 2429675cabc8SJintack Lim kvm_mode = KVM_MODE_NV; 2430675cabc8SJintack Lim return 0; 2431675cabc8SJintack Lim } 2432675cabc8SJintack Lim 2433d8b369c4SDavid Brazdil return -EINVAL; 2434d8b369c4SDavid Brazdil } 2435d8b369c4SDavid Brazdil early_param("kvm-arm.mode", early_kvm_mode_cfg); 2436d8b369c4SDavid Brazdil 24373eb681fbSDavid Brazdil enum kvm_mode kvm_get_mode(void) 24383eb681fbSDavid Brazdil { 24393eb681fbSDavid Brazdil return kvm_mode; 24403eb681fbSDavid Brazdil } 24413eb681fbSDavid Brazdil 24421dc0f02dSSean Christopherson module_init(kvm_arm_init); 2443