arm.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
 */
 
#include <linux/bug.h>
#include <linux/cpu_pm.h>
#include <linux/entry-kvm.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/mman.h>
#include <linux/sched.h>
#include <linux/kvm.h>
#include <linux/kvm_irqfd.h>
#include <linux/irqbypass.h>
#include <linux/sched/stat.h>
#include <linux/psci.h>
#include <trace/events/kvm.h>
 
#define CREATE_TRACE_POINTS
#include "trace_arm.h"
 
#include <linux/uaccess.h>
#include <asm/ptrace.h>
#include <asm/mman.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include <asm/cpufeature.h>
#include <asm/virt.h>
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_nested.h>
#include <asm/kvm_pkvm.h>
#include <asm/kvm_emulate.h>
#include <asm/sections.h>
 
#include <kvm/arm_hypercalls.h>
#include <kvm/arm_pmu.h>
#include <kvm/arm_psci.h>
 
static enum kvm_mode kvm_mode = KVM_MODE_DEFAULT;
 
DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector);
 
DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
 
DECLARE_KVM_NVHE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
 
static bool vgic_present, kvm_arm_initialised;
 
static DEFINE_PER_CPU(unsigned char, kvm_hyp_initialized);
DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
 
bool is_kvm_arm_initialised(void)
{
    return kvm_arm_initialised;
}
 
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
    return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
}
 
int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
                struct kvm_enable_cap *cap)
{
    int r;
    u64 new_cap;
 
    if (cap->flags)
        return -EINVAL;
 
    switch (cap->cap) {
    case KVM_CAP_ARM_NISV_TO_USER:
        r = 0;
        set_bit(KVM_ARCH_FLAG_RETURN_NISV_IO_ABORT_TO_USER,
            &kvm->arch.flags);
        break;
    case KVM_CAP_ARM_MTE:
        mutex_lock(&kvm->lock);
        if (!system_supports_mte() || kvm->created_vcpus) {
            r = -EINVAL;
        } else {
            r = 0;
            set_bit(KVM_ARCH_FLAG_MTE_ENABLED, &kvm->arch.flags);
        }
        mutex_unlock(&kvm->lock);
        break;
    case KVM_CAP_ARM_SYSTEM_SUSPEND:
        r = 0;
        set_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags);
        break;
    case KVM_CAP_ARM_EAGER_SPLIT_CHUNK_SIZE:
        new_cap = cap->args[0];
 
        mutex_lock(&kvm->slots_lock);
        /*
         * To keep things simple, allow changing the chunk
         * size only when no memory slots have been created.
         */
        if (!kvm_are_all_memslots_empty(kvm)) {
            r = -EINVAL;
        } else if (new_cap && !kvm_is_block_size_supported(new_cap)) {
            r = -EINVAL;
        } else {
            r = 0;
            kvm->arch.mmu.split_page_chunk_size = new_cap;
        }
        mutex_unlock(&kvm->slots_lock);
        break;
    default:
        r = -EINVAL;
        break;
    }
 
    return r;
}
 
static int kvm_arm_default_max_vcpus(void)
{
    return vgic_present ? kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
}
 
/**
 * kvm_arch_init_vm - initializes a VM data structure
 * @kvm:    pointer to the KVM struct
 */
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
    int ret;
 
    mutex_init(&kvm->arch.config_lock);
 
#ifdef CONFIG_LOCKDEP
    /* Clue in lockdep that the config_lock must be taken inside kvm->lock */
    mutex_lock(&kvm->lock);
    mutex_lock(&kvm->arch.config_lock);
    mutex_unlock(&kvm->arch.config_lock);
    mutex_unlock(&kvm->lock);
#endif
 
    ret = kvm_share_hyp(kvm, kvm + 1);
    if (ret)
        return ret;
 
    ret = pkvm_init_host_vm(kvm);
    if (ret)
        goto err_unshare_kvm;
 
    if (!zalloc_cpumask_var(&kvm->arch.supported_cpus, GFP_KERNEL_ACCOUNT)) {
        ret = -ENOMEM;
        goto err_unshare_kvm;
    }
    cpumask_copy(kvm->arch.supported_cpus, cpu_possible_mask);
 
    ret = kvm_init_stage2_mmu(kvm, &kvm->arch.mmu, type);
    if (ret)
        goto err_free_cpumask;
 
    kvm_vgic_early_init(kvm);
 
    kvm_timer_init_vm(kvm);
 
    /* The maximum number of VCPUs is limited by the host's GIC model */
    kvm->max_vcpus = kvm_arm_default_max_vcpus();
 
    kvm_arm_init_hypercalls(kvm);
 
    bitmap_zero(kvm->arch.vcpu_features, KVM_VCPU_MAX_FEATURES);
 
    return 0;
 
err_free_cpumask:
    free_cpumask_var(kvm->arch.supported_cpus);
err_unshare_kvm:
    kvm_unshare_hyp(kvm, kvm + 1);
    return ret;
}
 
vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
    return VM_FAULT_SIGBUS;
}
 
 
/**
 * kvm_arch_destroy_vm - destroy the VM data structure
 * @kvm:    pointer to the KVM struct
 */
void kvm_arch_destroy_vm(struct kvm *kvm)
{
    bitmap_free(kvm->arch.pmu_filter);
    free_cpumask_var(kvm->arch.supported_cpus);
 
    kvm_vgic_destroy(kvm);
 
    if (is_protected_kvm_enabled())
        pkvm_destroy_hyp_vm(kvm);
 
    kfree(kvm->arch.mpidr_data);
    kvm_destroy_vcpus(kvm);
 
    kvm_unshare_hyp(kvm, kvm + 1);
 
    kvm_arm_teardown_hypercalls(kvm);
}
 
int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
{
    int r;
    switch (ext) {
    case KVM_CAP_IRQCHIP:
        r = vgic_present;
        break;
    case KVM_CAP_IOEVENTFD:
    case KVM_CAP_USER_MEMORY:
    case KVM_CAP_SYNC_MMU:
    case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
    case KVM_CAP_ONE_REG:
    case KVM_CAP_ARM_PSCI:
    case KVM_CAP_ARM_PSCI_0_2:
    case KVM_CAP_READONLY_MEM:
    case KVM_CAP_MP_STATE:
    case KVM_CAP_IMMEDIATE_EXIT:
    case KVM_CAP_VCPU_EVENTS:
    case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
    case KVM_CAP_ARM_NISV_TO_USER:
    case KVM_CAP_ARM_INJECT_EXT_DABT:
    case KVM_CAP_SET_GUEST_DEBUG:
    case KVM_CAP_VCPU_ATTRIBUTES:
    case KVM_CAP_PTP_KVM:
    case KVM_CAP_ARM_SYSTEM_SUSPEND:
    case KVM_CAP_IRQFD_RESAMPLE:
    case KVM_CAP_COUNTER_OFFSET:
        r = 1;
        break;
    case KVM_CAP_SET_GUEST_DEBUG2:
        return KVM_GUESTDBG_VALID_MASK;
    case KVM_CAP_ARM_SET_DEVICE_ADDR:
        r = 1;
        break;
    case KVM_CAP_NR_VCPUS:
        /*
         * ARM64 treats KVM_CAP_NR_CPUS differently from all other
         * architectures, as it does not always bound it to
         * KVM_CAP_MAX_VCPUS. It should not matter much because
         * this is just an advisory value.
         */
        r = min_t(unsigned int, num_online_cpus(),
              kvm_arm_default_max_vcpus());
        break;
    case KVM_CAP_MAX_VCPUS:
    case KVM_CAP_MAX_VCPU_ID:
        if (kvm)
            r = kvm->max_vcpus;
        else
            r = kvm_arm_default_max_vcpus();
        break;
    case KVM_CAP_MSI_DEVID:
        if (!kvm)
            r = -EINVAL;
        else
            r = kvm->arch.vgic.msis_require_devid;
        break;
    case KVM_CAP_ARM_USER_IRQ:
        /*
         * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
         * (bump this number if adding more devices)
         */
        r = 1;
        break;
    case KVM_CAP_ARM_MTE:
        r = system_supports_mte();
        break;
    case KVM_CAP_STEAL_TIME:
        r = kvm_arm_pvtime_supported();
        break;
    case KVM_CAP_ARM_EL1_32BIT:
        r = cpus_have_final_cap(ARM64_HAS_32BIT_EL1);
        break;
    case KVM_CAP_GUEST_DEBUG_HW_BPS:
        r = get_num_brps();
        break;
    case KVM_CAP_GUEST_DEBUG_HW_WPS:
        r = get_num_wrps();
        break;
    case KVM_CAP_ARM_PMU_V3:
        r = kvm_arm_support_pmu_v3();
        break;
    case KVM_CAP_ARM_INJECT_SERROR_ESR:
        r = cpus_have_final_cap(ARM64_HAS_RAS_EXTN);
        break;
    case KVM_CAP_ARM_VM_IPA_SIZE:
        r = get_kvm_ipa_limit();
        break;
    case KVM_CAP_ARM_SVE:
        r = system_supports_sve();
        break;
    case KVM_CAP_ARM_PTRAUTH_ADDRESS:
    case KVM_CAP_ARM_PTRAUTH_GENERIC:
        r = system_has_full_ptr_auth();
        break;
    case KVM_CAP_ARM_EAGER_SPLIT_CHUNK_SIZE:
        if (kvm)
            r = kvm->arch.mmu.split_page_chunk_size;
        else
            r = KVM_ARM_EAGER_SPLIT_CHUNK_SIZE_DEFAULT;
        break;
    case KVM_CAP_ARM_SUPPORTED_BLOCK_SIZES:
        r = kvm_supported_block_sizes();
        break;
    case KVM_CAP_ARM_SUPPORTED_REG_MASK_RANGES:
        r = BIT(0);
        break;
    default:
        r = 0;
    }
 
    return r;
}
 
long kvm_arch_dev_ioctl(struct file *filp,
            unsigned int ioctl, unsigned long arg)
{
    return -EINVAL;
}
 
struct kvm *kvm_arch_alloc_vm(void)
{
    size_t sz = sizeof(struct kvm);
 
    if (!has_vhe())
        return kzalloc(sz, GFP_KERNEL_ACCOUNT);
 
    return __vmalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_HIGHMEM | __GFP_ZERO);
}
 
int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
    if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
        return -EBUSY;
 
    if (id >= kvm->max_vcpus)
        return -EINVAL;
 
    return 0;
}
 
int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
    int err;
 
    spin_lock_init(&vcpu->arch.mp_state_lock);
 
#ifdef CONFIG_LOCKDEP
    /* Inform lockdep that the config_lock is acquired after vcpu->mutex */
    mutex_lock(&vcpu->mutex);
    mutex_lock(&vcpu->kvm->arch.config_lock);
    mutex_unlock(&vcpu->kvm->arch.config_lock);
    mutex_unlock(&vcpu->mutex);
#endif
 
    /* Force users to call KVM_ARM_VCPU_INIT */
    vcpu_clear_flag(vcpu, VCPU_INITIALIZED);
 
    vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
 
    /*
     * Default value for the FP state, will be overloaded at load
     * time if we support FP (pretty likely)
     */
    vcpu->arch.fp_state = FP_STATE_FREE;
 
    /* Set up the timer */
    kvm_timer_vcpu_init(vcpu);
 
    kvm_pmu_vcpu_init(vcpu);
 
    kvm_arm_reset_debug_ptr(vcpu);
 
    kvm_arm_pvtime_vcpu_init(&vcpu->arch);
 
    vcpu->arch.hw_mmu = &vcpu->kvm->arch.mmu;
 
    err = kvm_vgic_vcpu_init(vcpu);
    if (err)
        return err;
 
    return kvm_share_hyp(vcpu, vcpu + 1);
}
 
void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
}
 
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
    if (vcpu_has_run_once(vcpu) && unlikely(!irqchip_in_kernel(vcpu->kvm)))
        static_branch_dec(&userspace_irqchip_in_use);
 
    kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
    kvm_timer_vcpu_terminate(vcpu);
    kvm_pmu_vcpu_destroy(vcpu);
    kvm_vgic_vcpu_destroy(vcpu);
    kvm_arm_vcpu_destroy(vcpu);
}
 
void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
{
 
}
 
void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
{
 
}
 
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
    struct kvm_s2_mmu *mmu;
    int *last_ran;
 
    mmu = vcpu->arch.hw_mmu;
    last_ran = this_cpu_ptr(mmu->last_vcpu_ran);
 
    /*
     * We guarantee that both TLBs and I-cache are private to each
     * vcpu. If detecting that a vcpu from the same VM has
     * previously run on the same physical CPU, call into the
     * hypervisor code to nuke the relevant contexts.
     *
     * We might get preempted before the vCPU actually runs, but
     * over-invalidation doesn't affect correctness.
     */
    if (*last_ran != vcpu->vcpu_idx) {
        kvm_call_hyp(__kvm_flush_cpu_context, mmu);
        *last_ran = vcpu->vcpu_idx;
    }
 
    vcpu->cpu = cpu;
 
    kvm_vgic_load(vcpu);
    kvm_timer_vcpu_load(vcpu);
    if (has_vhe())
        kvm_vcpu_load_vhe(vcpu);
    kvm_arch_vcpu_load_fp(vcpu);
    kvm_vcpu_pmu_restore_guest(vcpu);
    if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
        kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
 
    if (single_task_running())
        vcpu_clear_wfx_traps(vcpu);
    else
        vcpu_set_wfx_traps(vcpu);
 
    if (vcpu_has_ptrauth(vcpu))
        vcpu_ptrauth_disable(vcpu);
    kvm_arch_vcpu_load_debug_state_flags(vcpu);
 
    if (!cpumask_test_cpu(cpu, vcpu->kvm->arch.supported_cpus))
        vcpu_set_on_unsupported_cpu(vcpu);
}
 
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
    kvm_arch_vcpu_put_debug_state_flags(vcpu);
    kvm_arch_vcpu_put_fp(vcpu);
    if (has_vhe())
        kvm_vcpu_put_vhe(vcpu);
    kvm_timer_vcpu_put(vcpu);
    kvm_vgic_put(vcpu);
    kvm_vcpu_pmu_restore_host(vcpu);
    kvm_arm_vmid_clear_active();
 
    vcpu_clear_on_unsupported_cpu(vcpu);
    vcpu->cpu = -1;
}
 
static void __kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu)
{
    WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_STOPPED);
    kvm_make_request(KVM_REQ_SLEEP, vcpu);
    kvm_vcpu_kick(vcpu);
}
 
void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu)
{
    spin_lock(&vcpu->arch.mp_state_lock);
    __kvm_arm_vcpu_power_off(vcpu);
    spin_unlock(&vcpu->arch.mp_state_lock);
}
 
bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu)
{
    return READ_ONCE(vcpu->arch.mp_state.mp_state) == KVM_MP_STATE_STOPPED;
}
 
static void kvm_arm_vcpu_suspend(struct kvm_vcpu *vcpu)
{
    WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_SUSPENDED);
    kvm_make_request(KVM_REQ_SUSPEND, vcpu);
    kvm_vcpu_kick(vcpu);
}
 
static bool kvm_arm_vcpu_suspended(struct kvm_vcpu *vcpu)
{
    return READ_ONCE(vcpu->arch.mp_state.mp_state) == KVM_MP_STATE_SUSPENDED;
}
 
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
                    struct kvm_mp_state *mp_state)
{
    *mp_state = READ_ONCE(vcpu->arch.mp_state);
 
    return 0;
}
 
int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                    struct kvm_mp_state *mp_state)
{
    int ret = 0;
 
    spin_lock(&vcpu->arch.mp_state_lock);
 
    switch (mp_state->mp_state) {
    case KVM_MP_STATE_RUNNABLE:
        WRITE_ONCE(vcpu->arch.mp_state, *mp_state);
        break;
    case KVM_MP_STATE_STOPPED:
        __kvm_arm_vcpu_power_off(vcpu);
        break;
    case KVM_MP_STATE_SUSPENDED:
        kvm_arm_vcpu_suspend(vcpu);
        break;
    default:
        ret = -EINVAL;
    }
 
    spin_unlock(&vcpu->arch.mp_state_lock);
 
    return ret;
}
 
/**
 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
 * @v:      The VCPU pointer
 *
 * If the guest CPU is not waiting for interrupts or an interrupt line is
 * asserted, the CPU is by definition runnable.
 */
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
    bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
    return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
        && !kvm_arm_vcpu_stopped(v) && !v->arch.pause);
}
 
bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
{
    return vcpu_mode_priv(vcpu);
}
 
#ifdef CONFIG_GUEST_PERF_EVENTS
unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)
{
    return *vcpu_pc(vcpu);
}
#endif
 
static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
{
    return vcpu_get_flag(vcpu, VCPU_INITIALIZED);
}
 
static void kvm_init_mpidr_data(struct kvm *kvm)
{
    struct kvm_mpidr_data *data = NULL;
    unsigned long c, mask, nr_entries;
    u64 aff_set = 0, aff_clr = ~0UL;
    struct kvm_vcpu *vcpu;
 
    mutex_lock(&kvm->arch.config_lock);
 
    if (kvm->arch.mpidr_data || atomic_read(&kvm->online_vcpus) == 1)
        goto out;
 
    kvm_for_each_vcpu(c, vcpu, kvm) {
        u64 aff = kvm_vcpu_get_mpidr_aff(vcpu);
        aff_set |= aff;
        aff_clr &= aff;
    }
 
    /*
     * A significant bit can be either 0 or 1, and will only appear in
     * aff_set. Use aff_clr to weed out the useless stuff.
     */
    mask = aff_set ^ aff_clr;
    nr_entries = BIT_ULL(hweight_long(mask));
 
    /*
     * Don't let userspace fool us. If we need more than a single page
     * to describe the compressed MPIDR array, just fall back to the
     * iterative method. Single vcpu VMs do not need this either.
     */
    if (struct_size(data, cmpidr_to_idx, nr_entries) <= PAGE_SIZE)
        data = kzalloc(struct_size(data, cmpidr_to_idx, nr_entries),
                   GFP_KERNEL_ACCOUNT);
 
    if (!data)
        goto out;
 
    data->mpidr_mask = mask;
 
    kvm_for_each_vcpu(c, vcpu, kvm) {
        u64 aff = kvm_vcpu_get_mpidr_aff(vcpu);
        u16 index = kvm_mpidr_index(data, aff);
 
        data->cmpidr_to_idx[index] = c;
    }
 
    kvm->arch.mpidr_data = data;
out:
    mutex_unlock(&kvm->arch.config_lock);
}
 
/*
 * Handle both the initialisation that is being done when the vcpu is
 * run for the first time, as well as the updates that must be
 * performed each time we get a new thread dealing with this vcpu.
 */
int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
{
    struct kvm *kvm = vcpu->kvm;
    int ret;
 
    if (!kvm_vcpu_initialized(vcpu))
        return -ENOEXEC;
 
    if (!kvm_arm_vcpu_is_finalized(vcpu))
        return -EPERM;
 
    ret = kvm_arch_vcpu_run_map_fp(vcpu);
    if (ret)
        return ret;
 
    if (likely(vcpu_has_run_once(vcpu)))
        return 0;
 
    kvm_init_mpidr_data(kvm);
 
    kvm_arm_vcpu_init_debug(vcpu);
 
    if (likely(irqchip_in_kernel(kvm))) {
        /*
         * Map the VGIC hardware resources before running a vcpu the
         * first time on this VM.
         */
        ret = kvm_vgic_map_resources(kvm);
        if (ret)
            return ret;
    }
 
    if (vcpu_has_nv(vcpu)) {
        ret = kvm_init_nv_sysregs(vcpu->kvm);
        if (ret)
            return ret;
    }
 
    ret = kvm_timer_enable(vcpu);
    if (ret)
        return ret;
 
    ret = kvm_arm_pmu_v3_enable(vcpu);
    if (ret)
        return ret;
 
    if (is_protected_kvm_enabled()) {
        ret = pkvm_create_hyp_vm(kvm);
        if (ret)
            return ret;
    }
 
    if (!irqchip_in_kernel(kvm)) {
        /*
         * Tell the rest of the code that there are userspace irqchip
         * VMs in the wild.
         */
        static_branch_inc(&userspace_irqchip_in_use);
    }
 
    /*
     * Initialize traps for protected VMs.
     * NOTE: Move to run in EL2 directly, rather than via a hypercall, once
     * the code is in place for first run initialization at EL2.
     */
    if (kvm_vm_is_protected(kvm))
        kvm_call_hyp_nvhe(__pkvm_vcpu_init_traps, vcpu);
 
    mutex_lock(&kvm->arch.config_lock);
    set_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &kvm->arch.flags);
    mutex_unlock(&kvm->arch.config_lock);
 
    return ret;
}
 
bool kvm_arch_intc_initialized(struct kvm *kvm)
{
    return vgic_initialized(kvm);
}
 
void kvm_arm_halt_guest(struct kvm *kvm)
{
    unsigned long i;
    struct kvm_vcpu *vcpu;
 
    kvm_for_each_vcpu(i, vcpu, kvm)
        vcpu->arch.pause = true;
    kvm_make_all_cpus_request(kvm, KVM_REQ_SLEEP);
}
 
void kvm_arm_resume_guest(struct kvm *kvm)
{
    unsigned long i;
    struct kvm_vcpu *vcpu;
 
    kvm_for_each_vcpu(i, vcpu, kvm) {
        vcpu->arch.pause = false;
        __kvm_vcpu_wake_up(vcpu);
    }
}
 
static void kvm_vcpu_sleep(struct kvm_vcpu *vcpu)
{
    struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
 
    rcuwait_wait_event(wait,
               (!kvm_arm_vcpu_stopped(vcpu)) && (!vcpu->arch.pause),
               TASK_INTERRUPTIBLE);
 
    if (kvm_arm_vcpu_stopped(vcpu) || vcpu->arch.pause) {
        /* Awaken to handle a signal, request we sleep again later. */
        kvm_make_request(KVM_REQ_SLEEP, vcpu);
    }
 
    /*
     * Make sure we will observe a potential reset request if we've
     * observed a change to the power state. Pairs with the smp_wmb() in
     * kvm_psci_vcpu_on().
     */
    smp_rmb();
}
 
/**
 * kvm_vcpu_wfi - emulate Wait-For-Interrupt behavior
 * @vcpu:   The VCPU pointer
 *
 * Suspend execution of a vCPU until a valid wake event is detected, i.e. until
 * the vCPU is runnable.  The vCPU may or may not be scheduled out, depending
 * on when a wake event arrives, e.g. there may already be a pending wake event.
 */
void kvm_vcpu_wfi(struct kvm_vcpu *vcpu)
{
    /*
     * Sync back the state of the GIC CPU interface so that we have
     * the latest PMR and group enables. This ensures that
     * kvm_arch_vcpu_runnable has up-to-date data to decide whether
     * we have pending interrupts, e.g. when determining if the
     * vCPU should block.
     *
     * For the same reason, we want to tell GICv4 that we need
     * doorbells to be signalled, should an interrupt become pending.
     */
    preempt_disable();
    kvm_vgic_vmcr_sync(vcpu);
    vcpu_set_flag(vcpu, IN_WFI);
    vgic_v4_put(vcpu);
    preempt_enable();
 
    kvm_vcpu_halt(vcpu);
    vcpu_clear_flag(vcpu, IN_WFIT);
 
    preempt_disable();
    vcpu_clear_flag(vcpu, IN_WFI);
    vgic_v4_load(vcpu);
    preempt_enable();
}
 
static int kvm_vcpu_suspend(struct kvm_vcpu *vcpu)
{
    if (!kvm_arm_vcpu_suspended(vcpu))
        return 1;
 
    kvm_vcpu_wfi(vcpu);
 
    /*
     * The suspend state is sticky; we do not leave it until userspace
     * explicitly marks the vCPU as runnable. Request that we suspend again
     * later.
     */
    kvm_make_request(KVM_REQ_SUSPEND, vcpu);
 
    /*
     * Check to make sure the vCPU is actually runnable. If so, exit to
     * userspace informing it of the wakeup condition.
     */
    if (kvm_arch_vcpu_runnable(vcpu)) {
        memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
        vcpu->run->system_event.type = KVM_SYSTEM_EVENT_WAKEUP;
        vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
        return 0;
    }
 
    /*
     * Otherwise, we were unblocked to process a different event, such as a
     * pending signal. Return 1 and allow kvm_arch_vcpu_ioctl_run() to
     * process the event.
     */
    return 1;
}
 
/**
 * check_vcpu_requests - check and handle pending vCPU requests
 * @vcpu:   the VCPU pointer
 *
 * Return: 1 if we should enter the guest
 *     0 if we should exit to userspace
 *     < 0 if we should exit to userspace, where the return value indicates
 *     an error
 */
static int check_vcpu_requests(struct kvm_vcpu *vcpu)
{
    if (kvm_request_pending(vcpu)) {
        if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
            kvm_vcpu_sleep(vcpu);
 
        if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
            kvm_reset_vcpu(vcpu);
 
        /*
         * Clear IRQ_PENDING requests that were made to guarantee
         * that a VCPU sees new virtual interrupts.
         */
        kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
 
        if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu))
            kvm_update_stolen_time(vcpu);
 
        if (kvm_check_request(KVM_REQ_RELOAD_GICv4, vcpu)) {
            /* The distributor enable bits were changed */
            preempt_disable();
            vgic_v4_put(vcpu);
            vgic_v4_load(vcpu);
            preempt_enable();
        }
 
        if (kvm_check_request(KVM_REQ_RELOAD_PMU, vcpu))
            kvm_vcpu_reload_pmu(vcpu);
 
        if (kvm_check_request(KVM_REQ_RESYNC_PMU_EL0, vcpu))
            kvm_vcpu_pmu_restore_guest(vcpu);
 
        if (kvm_check_request(KVM_REQ_SUSPEND, vcpu))
            return kvm_vcpu_suspend(vcpu);
 
        if (kvm_dirty_ring_check_request(vcpu))
            return 0;
    }
 
    return 1;
}
 
static bool vcpu_mode_is_bad_32bit(struct kvm_vcpu *vcpu)
{
    if (likely(!vcpu_mode_is_32bit(vcpu)))
        return false;
 
    if (vcpu_has_nv(vcpu))
        return true;
 
    return !kvm_supports_32bit_el0();
}
 
/**
 * kvm_vcpu_exit_request - returns true if the VCPU should *not* enter the guest
 * @vcpu:   The VCPU pointer
 * @ret:    Pointer to write optional return code
 *
 * Returns: true if the VCPU needs to return to a preemptible + interruptible
 *      and skip guest entry.
 *
 * This function disambiguates between two different types of exits: exits to a
 * preemptible + interruptible kernel context and exits to userspace. For an
 * exit to userspace, this function will write the return code to ret and return
 * true. For an exit to preemptible + interruptible kernel context (i.e. check
 * for pending work and re-enter), return true without writing to ret.
 */
static bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu, int *ret)
{
    struct kvm_run *run = vcpu->run;
 
    /*
     * If we're using a userspace irqchip, then check if we need
     * to tell a userspace irqchip about timer or PMU level
     * changes and if so, exit to userspace (the actual level
     * state gets updated in kvm_timer_update_run and
     * kvm_pmu_update_run below).
     */
    if (static_branch_unlikely(&userspace_irqchip_in_use)) {
        if (kvm_timer_should_notify_user(vcpu) ||
            kvm_pmu_should_notify_user(vcpu)) {
            *ret = -EINTR;
            run->exit_reason = KVM_EXIT_INTR;
            return true;
        }
    }
 
    if (unlikely(vcpu_on_unsupported_cpu(vcpu))) {
        run->exit_reason = KVM_EXIT_FAIL_ENTRY;
        run->fail_entry.hardware_entry_failure_reason = KVM_EXIT_FAIL_ENTRY_CPU_UNSUPPORTED;
        run->fail_entry.cpu = smp_processor_id();
        *ret = 0;
        return true;
    }
 
    return kvm_request_pending(vcpu) ||
            xfer_to_guest_mode_work_pending();
}
 
/*
 * Actually run the vCPU, entering an RCU extended quiescent state (EQS) while
 * the vCPU is running.
 *
 * This must be noinstr as instrumentation may make use of RCU, and this is not
 * safe during the EQS.
 */
static int noinstr kvm_arm_vcpu_enter_exit(struct kvm_vcpu *vcpu)
{
    int ret;
 
    guest_state_enter_irqoff();
    ret = kvm_call_hyp_ret(__kvm_vcpu_run, vcpu);
    guest_state_exit_irqoff();
 
    return ret;
}
 
/**
 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
 * @vcpu:   The VCPU pointer
 *
 * This function is called through the VCPU_RUN ioctl called from user space. It
 * will execute VM code in a loop until the time slice for the process is used
 * or some emulation is needed from user space in which case the function will
 * return with return value 0 and with the kvm_run structure filled in with the
 * required data for the requested emulation.
 */
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
{
    struct kvm_run *run = vcpu->run;
    int ret;
 
    if (run->exit_reason == KVM_EXIT_MMIO) {
        ret = kvm_handle_mmio_return(vcpu);
        if (ret)
            return ret;
    }
 
    vcpu_load(vcpu);
 
    if (run->immediate_exit) {
        ret = -EINTR;
        goto out;
    }
 
    kvm_sigset_activate(vcpu);
 
    ret = 1;
    run->exit_reason = KVM_EXIT_UNKNOWN;
    run->flags = 0;
    while (ret > 0) {
        /*
         * Check conditions before entering the guest
         */
        ret = xfer_to_guest_mode_handle_work(vcpu);
        if (!ret)
            ret = 1;
 
        if (ret > 0)
            ret = check_vcpu_requests(vcpu);
 
        /*
         * Preparing the interrupts to be injected also
         * involves poking the GIC, which must be done in a
         * non-preemptible context.
         */
        preempt_disable();
 
        /*
         * The VMID allocator only tracks active VMIDs per
         * physical CPU, and therefore the VMID allocated may not be
         * preserved on VMID roll-over if the task was preempted,
         * making a thread's VMID inactive. So we need to call
         * kvm_arm_vmid_update() in non-premptible context.
         */
        if (kvm_arm_vmid_update(&vcpu->arch.hw_mmu->vmid) &&
            has_vhe())
            __load_stage2(vcpu->arch.hw_mmu,
                      vcpu->arch.hw_mmu->arch);
 
        kvm_pmu_flush_hwstate(vcpu);
 
        local_irq_disable();
 
        kvm_vgic_flush_hwstate(vcpu);
 
        kvm_pmu_update_vcpu_events(vcpu);
 
        /*
         * Ensure we set mode to IN_GUEST_MODE after we disable
         * interrupts and before the final VCPU requests check.
         * See the comment in kvm_vcpu_exiting_guest_mode() and
         * Documentation/virt/kvm/vcpu-requests.rst
         */
        smp_store_mb(vcpu->mode, IN_GUEST_MODE);
 
        if (ret <= 0 || kvm_vcpu_exit_request(vcpu, &ret)) {
            vcpu->mode = OUTSIDE_GUEST_MODE;
            isb(); /* Ensure work in x_flush_hwstate is committed */
            kvm_pmu_sync_hwstate(vcpu);
            if (static_branch_unlikely(&userspace_irqchip_in_use))
                kvm_timer_sync_user(vcpu);
            kvm_vgic_sync_hwstate(vcpu);
            local_irq_enable();
            preempt_enable();
            continue;
        }
 
        kvm_arm_setup_debug(vcpu);
        kvm_arch_vcpu_ctxflush_fp(vcpu);
 
        /**************************************************************
         * Enter the guest
         */
        trace_kvm_entry(*vcpu_pc(vcpu));
        guest_timing_enter_irqoff();
 
        ret = kvm_arm_vcpu_enter_exit(vcpu);
 
        vcpu->mode = OUTSIDE_GUEST_MODE;
        vcpu->stat.exits++;
        /*
         * Back from guest
         *************************************************************/
 
        kvm_arm_clear_debug(vcpu);
 
        /*
         * We must sync the PMU state before the vgic state so
         * that the vgic can properly sample the updated state of the
         * interrupt line.
         */
        kvm_pmu_sync_hwstate(vcpu);
 
        /*
         * Sync the vgic state before syncing the timer state because
         * the timer code needs to know if the virtual timer
         * interrupts are active.
         */
        kvm_vgic_sync_hwstate(vcpu);
 
        /*
         * Sync the timer hardware state before enabling interrupts as
         * we don't want vtimer interrupts to race with syncing the
         * timer virtual interrupt state.
         */
        if (static_branch_unlikely(&userspace_irqchip_in_use))
            kvm_timer_sync_user(vcpu);
 
        kvm_arch_vcpu_ctxsync_fp(vcpu);
 
        /*
         * We must ensure that any pending interrupts are taken before
         * we exit guest timing so that timer ticks are accounted as
         * guest time. Transiently unmask interrupts so that any
         * pending interrupts are taken.
         *
         * Per ARM DDI 0487G.b section D1.13.4, an ISB (or other
         * context synchronization event) is necessary to ensure that
         * pending interrupts are taken.
         */
        if (ARM_EXCEPTION_CODE(ret) == ARM_EXCEPTION_IRQ) {
            local_irq_enable();
            isb();
            local_irq_disable();
        }
 
        guest_timing_exit_irqoff();
 
        local_irq_enable();
 
        trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
 
        /* Exit types that need handling before we can be preempted */
        handle_exit_early(vcpu, ret);
 
        preempt_enable();
 
        /*
         * The ARMv8 architecture doesn't give the hypervisor
         * a mechanism to prevent a guest from dropping to AArch32 EL0
         * if implemented by the CPU. If we spot the guest in such
         * state and that we decided it wasn't supposed to do so (like
         * with the asymmetric AArch32 case), return to userspace with
         * a fatal error.
         */
        if (vcpu_mode_is_bad_32bit(vcpu)) {
            /*
             * As we have caught the guest red-handed, decide that
             * it isn't fit for purpose anymore by making the vcpu
             * invalid. The VMM can try and fix it by issuing  a
             * KVM_ARM_VCPU_INIT if it really wants to.
             */
            vcpu_clear_flag(vcpu, VCPU_INITIALIZED);
            ret = ARM_EXCEPTION_IL;
        }
 
        ret = handle_exit(vcpu, ret);
    }
 
    /* Tell userspace about in-kernel device output levels */
    if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
        kvm_timer_update_run(vcpu);
        kvm_pmu_update_run(vcpu);
    }
 
    kvm_sigset_deactivate(vcpu);
 
out:
    /*
     * In the unlikely event that we are returning to userspace
     * with pending exceptions or PC adjustment, commit these
     * adjustments in order to give userspace a consistent view of
     * the vcpu state. Note that this relies on __kvm_adjust_pc()
     * being preempt-safe on VHE.
     */
    if (unlikely(vcpu_get_flag(vcpu, PENDING_EXCEPTION) ||
             vcpu_get_flag(vcpu, INCREMENT_PC)))
        kvm_call_hyp(__kvm_adjust_pc, vcpu);
 
    vcpu_put(vcpu);
    return ret;
}
 
static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
{
    int bit_index;
    bool set;
    unsigned long *hcr;
 
    if (number == KVM_ARM_IRQ_CPU_IRQ)
        bit_index = __ffs(HCR_VI);
    else /* KVM_ARM_IRQ_CPU_FIQ */
        bit_index = __ffs(HCR_VF);
 
    hcr = vcpu_hcr(vcpu);
    if (level)
        set = test_and_set_bit(bit_index, hcr);
    else
        set = test_and_clear_bit(bit_index, hcr);
 
    /*
     * If we didn't change anything, no need to wake up or kick other CPUs
     */
    if (set == level)
        return 0;
 
    /*
     * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
     * trigger a world-switch round on the running physical CPU to set the
     * virtual IRQ/FIQ fields in the HCR appropriately.
     */
    kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
    kvm_vcpu_kick(vcpu);
 
    return 0;
}
 
int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
              bool line_status)
{
    u32 irq = irq_level->irq;
    unsigned int irq_type, vcpu_id, irq_num;
    struct kvm_vcpu *vcpu = NULL;
    bool level = irq_level->level;
 
    irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
    vcpu_id = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
    vcpu_id += ((irq >> KVM_ARM_IRQ_VCPU2_SHIFT) & KVM_ARM_IRQ_VCPU2_MASK) * (KVM_ARM_IRQ_VCPU_MASK + 1);
    irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
 
    trace_kvm_irq_line(irq_type, vcpu_id, irq_num, irq_level->level);
 
    switch (irq_type) {
    case KVM_ARM_IRQ_TYPE_CPU:
        if (irqchip_in_kernel(kvm))
            return -ENXIO;
 
        vcpu = kvm_get_vcpu_by_id(kvm, vcpu_id);
        if (!vcpu)
            return -EINVAL;
 
        if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
            return -EINVAL;
 
        return vcpu_interrupt_line(vcpu, irq_num, level);
    case KVM_ARM_IRQ_TYPE_PPI:
        if (!irqchip_in_kernel(kvm))
            return -ENXIO;
 
        vcpu = kvm_get_vcpu_by_id(kvm, vcpu_id);
        if (!vcpu)
            return -EINVAL;
 
        if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
            return -EINVAL;
 
        return kvm_vgic_inject_irq(kvm, vcpu, irq_num, level, NULL);
    case KVM_ARM_IRQ_TYPE_SPI:
        if (!irqchip_in_kernel(kvm))
            return -ENXIO;
 
        if (irq_num < VGIC_NR_PRIVATE_IRQS)
            return -EINVAL;
 
        return kvm_vgic_inject_irq(kvm, NULL, irq_num, level, NULL);
    }
 
    return -EINVAL;
}
 
static unsigned long system_supported_vcpu_features(void)
{
    unsigned long features = KVM_VCPU_VALID_FEATURES;
 
    if (!cpus_have_final_cap(ARM64_HAS_32BIT_EL1))
        clear_bit(KVM_ARM_VCPU_EL1_32BIT, &features);
 
    if (!kvm_arm_support_pmu_v3())
        clear_bit(KVM_ARM_VCPU_PMU_V3, &features);
 
    if (!system_supports_sve())
        clear_bit(KVM_ARM_VCPU_SVE, &features);
 
    if (!system_has_full_ptr_auth()) {
        clear_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, &features);
        clear_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, &features);
    }
 
    if (!cpus_have_final_cap(ARM64_HAS_NESTED_VIRT))
        clear_bit(KVM_ARM_VCPU_HAS_EL2, &features);
 
    return features;
}
 
static int kvm_vcpu_init_check_features(struct kvm_vcpu *vcpu,
                    const struct kvm_vcpu_init *init)
{
    unsigned long features = init->features[0];
    int i;
 
    if (features & ~KVM_VCPU_VALID_FEATURES)
        return -ENOENT;
 
    for (i = 1; i < ARRAY_SIZE(init->features); i++) {
        if (init->features[i])
            return -ENOENT;
    }
 
    if (features & ~system_supported_vcpu_features())
        return -EINVAL;
 
    /*
     * For now make sure that both address/generic pointer authentication
     * features are requested by the userspace together.
     */
    if (test_bit(KVM_ARM_VCPU_PTRAUTH_ADDRESS, &features) !=
        test_bit(KVM_ARM_VCPU_PTRAUTH_GENERIC, &features))
        return -EINVAL;
 
    /* Disallow NV+SVE for the time being */
    if (test_bit(KVM_ARM_VCPU_HAS_EL2, &features) &&
        test_bit(KVM_ARM_VCPU_SVE, &features))
        return -EINVAL;
 
    if (!test_bit(KVM_ARM_VCPU_EL1_32BIT, &features))
        return 0;
 
    /* MTE is incompatible with AArch32 */
    if (kvm_has_mte(vcpu->kvm))
        return -EINVAL;
 
    /* NV is incompatible with AArch32 */
    if (test_bit(KVM_ARM_VCPU_HAS_EL2, &features))
        return -EINVAL;
 
    return 0;
}
 
static bool kvm_vcpu_init_changed(struct kvm_vcpu *vcpu,
                  const struct kvm_vcpu_init *init)
{
    unsigned long features = init->features[0];
 
    return !bitmap_equal(vcpu->kvm->arch.vcpu_features, &features,
                 KVM_VCPU_MAX_FEATURES);
}
 
static int kvm_setup_vcpu(struct kvm_vcpu *vcpu)
{
    struct kvm *kvm = vcpu->kvm;
    int ret = 0;
 
    /*
     * When the vCPU has a PMU, but no PMU is set for the guest
     * yet, set the default one.
     */
    if (kvm_vcpu_has_pmu(vcpu) && !kvm->arch.arm_pmu)
        ret = kvm_arm_set_default_pmu(kvm);
 
    return ret;
}
 
static int __kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
                 const struct kvm_vcpu_init *init)
{
    unsigned long features = init->features[0];
    struct kvm *kvm = vcpu->kvm;
    int ret = -EINVAL;
 
    mutex_lock(&kvm->arch.config_lock);
 
    if (test_bit(KVM_ARCH_FLAG_VCPU_FEATURES_CONFIGURED, &kvm->arch.flags) &&
        kvm_vcpu_init_changed(vcpu, init))
        goto out_unlock;
 
    bitmap_copy(kvm->arch.vcpu_features, &features, KVM_VCPU_MAX_FEATURES);
 
    ret = kvm_setup_vcpu(vcpu);
    if (ret)
        goto out_unlock;
 
    /* Now we know what it is, we can reset it. */
    kvm_reset_vcpu(vcpu);
 
    set_bit(KVM_ARCH_FLAG_VCPU_FEATURES_CONFIGURED, &kvm->arch.flags);
    vcpu_set_flag(vcpu, VCPU_INITIALIZED);
    ret = 0;
out_unlock:
    mutex_unlock(&kvm->arch.config_lock);
    return ret;
}
 
static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
                   const struct kvm_vcpu_init *init)
{
    int ret;
 
    if (init->target != KVM_ARM_TARGET_GENERIC_V8 &&
        init->target != kvm_target_cpu())
        return -EINVAL;
 
    ret = kvm_vcpu_init_check_features(vcpu, init);
    if (ret)
        return ret;
 
    if (!kvm_vcpu_initialized(vcpu))
        return __kvm_vcpu_set_target(vcpu, init);
 
    if (kvm_vcpu_init_changed(vcpu, init))
        return -EINVAL;
 
    kvm_reset_vcpu(vcpu);
    return 0;
}
 
static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
                     struct kvm_vcpu_init *init)
{
    bool power_off = false;
    int ret;
 
    /*
     * Treat the power-off vCPU feature as ephemeral. Clear the bit to avoid
     * reflecting it in the finalized feature set, thus limiting its scope
     * to a single KVM_ARM_VCPU_INIT call.
     */
    if (init->features[0] & BIT(KVM_ARM_VCPU_POWER_OFF)) {
        init->features[0] &= ~BIT(KVM_ARM_VCPU_POWER_OFF);
        power_off = true;
    }
 
    ret = kvm_vcpu_set_target(vcpu, init);
    if (ret)
        return ret;
 
    /*
     * Ensure a rebooted VM will fault in RAM pages and detect if the
     * guest MMU is turned off and flush the caches as needed.
     *
     * S2FWB enforces all memory accesses to RAM being cacheable,
     * ensuring that the data side is always coherent. We still
     * need to invalidate the I-cache though, as FWB does *not*
     * imply CTR_EL0.DIC.
     */
    if (vcpu_has_run_once(vcpu)) {
        if (!cpus_have_final_cap(ARM64_HAS_STAGE2_FWB))
            stage2_unmap_vm(vcpu->kvm);
        else
            icache_inval_all_pou();
    }
 
    vcpu_reset_hcr(vcpu);
    vcpu->arch.cptr_el2 = kvm_get_reset_cptr_el2(vcpu);
 
    /*
     * Handle the "start in power-off" case.
     */
    spin_lock(&vcpu->arch.mp_state_lock);
 
    if (power_off)
        __kvm_arm_vcpu_power_off(vcpu);
    else
        WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_RUNNABLE);
 
    spin_unlock(&vcpu->arch.mp_state_lock);
 
    return 0;
}
 
static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
                 struct kvm_device_attr *attr)
{
    int ret = -ENXIO;
 
    switch (attr->group) {
    default:
        ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
        break;
    }
 
    return ret;
}
 
static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
                 struct kvm_device_attr *attr)
{
    int ret = -ENXIO;
 
    switch (attr->group) {
    default:
        ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
        break;
    }
 
    return ret;
}
 
static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
                 struct kvm_device_attr *attr)
{
    int ret = -ENXIO;
 
    switch (attr->group) {
    default:
        ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
        break;
    }
 
    return ret;
}
 
static int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
                   struct kvm_vcpu_events *events)
{
    memset(events, 0, sizeof(*events));
 
    return __kvm_arm_vcpu_get_events(vcpu, events);
}
 
static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
                   struct kvm_vcpu_events *events)
{
    int i;
 
    /* check whether the reserved field is zero */
    for (i = 0; i < ARRAY_SIZE(events->reserved); i++)
        if (events->reserved[i])
            return -EINVAL;
 
    /* check whether the pad field is zero */
    for (i = 0; i < ARRAY_SIZE(events->exception.pad); i++)
        if (events->exception.pad[i])
            return -EINVAL;
 
    return __kvm_arm_vcpu_set_events(vcpu, events);
}
 
long kvm_arch_vcpu_ioctl(struct file *filp,
             unsigned int ioctl, unsigned long arg)
{
    struct kvm_vcpu *vcpu = filp->private_data;
    void __user *argp = (void __user *)arg;
    struct kvm_device_attr attr;
    long r;
 
    switch (ioctl) {
    case KVM_ARM_VCPU_INIT: {
        struct kvm_vcpu_init init;
 
        r = -EFAULT;
        if (copy_from_user(&init, argp, sizeof(init)))
            break;
 
        r = kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
        break;
    }
    case KVM_SET_ONE_REG:
    case KVM_GET_ONE_REG: {
        struct kvm_one_reg reg;
 
        r = -ENOEXEC;
        if (unlikely(!kvm_vcpu_initialized(vcpu)))
            break;
 
        r = -EFAULT;
        if (copy_from_user(&reg, argp, sizeof(reg)))
            break;
 
        /*
         * We could owe a reset due to PSCI. Handle the pending reset
         * here to ensure userspace register accesses are ordered after
         * the reset.
         */
        if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
            kvm_reset_vcpu(vcpu);
 
        if (ioctl == KVM_SET_ONE_REG)
            r = kvm_arm_set_reg(vcpu, &reg);
        else
            r = kvm_arm_get_reg(vcpu, &reg);
        break;
    }
    case KVM_GET_REG_LIST: {
        struct kvm_reg_list __user *user_list = argp;
        struct kvm_reg_list reg_list;
        unsigned n;
 
        r = -ENOEXEC;
        if (unlikely(!kvm_vcpu_initialized(vcpu)))
            break;
 
        r = -EPERM;
        if (!kvm_arm_vcpu_is_finalized(vcpu))
            break;
 
        r = -EFAULT;
        if (copy_from_user(&reg_list, user_list, sizeof(reg_list)))
            break;
        n = reg_list.n;
        reg_list.n = kvm_arm_num_regs(vcpu);
        if (copy_to_user(user_list, &reg_list, sizeof(reg_list)))
            break;
        r = -E2BIG;
        if (n < reg_list.n)
            break;
        r = kvm_arm_copy_reg_indices(vcpu, user_list->reg);
        break;
    }
    case KVM_SET_DEVICE_ATTR: {
        r = -EFAULT;
        if (copy_from_user(&attr, argp, sizeof(attr)))
            break;
        r = kvm_arm_vcpu_set_attr(vcpu, &attr);
        break;
    }
    case KVM_GET_DEVICE_ATTR: {
        r = -EFAULT;
        if (copy_from_user(&attr, argp, sizeof(attr)))
            break;
        r = kvm_arm_vcpu_get_attr(vcpu, &attr);
        break;
    }
    case KVM_HAS_DEVICE_ATTR: {
        r = -EFAULT;
        if (copy_from_user(&attr, argp, sizeof(attr)))
            break;
        r = kvm_arm_vcpu_has_attr(vcpu, &attr);
        break;
    }
    case KVM_GET_VCPU_EVENTS: {
        struct kvm_vcpu_events events;
 
        if (kvm_arm_vcpu_get_events(vcpu, &events))
            return -EINVAL;
 
        if (copy_to_user(argp, &events, sizeof(events)))
            return -EFAULT;
 
        return 0;
    }
    case KVM_SET_VCPU_EVENTS: {
        struct kvm_vcpu_events events;
 
        if (copy_from_user(&events, argp, sizeof(events)))
            return -EFAULT;
 
        return kvm_arm_vcpu_set_events(vcpu, &events);
    }
    case KVM_ARM_VCPU_FINALIZE: {
        int what;
 
        if (!kvm_vcpu_initialized(vcpu))
            return -ENOEXEC;
 
        if (get_user(what, (const int __user *)argp))
            return -EFAULT;
 
        return kvm_arm_vcpu_finalize(vcpu, what);
    }
    default:
        r = -EINVAL;
    }
 
    return r;
}
 
void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
{
 
}
 
static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
                    struct kvm_arm_device_addr *dev_addr)
{
    switch (FIELD_GET(KVM_ARM_DEVICE_ID_MASK, dev_addr->id)) {
    case KVM_ARM_DEVICE_VGIC_V2:
        if (!vgic_present)
            return -ENXIO;
        return kvm_set_legacy_vgic_v2_addr(kvm, dev_addr);
    default:
        return -ENODEV;
    }
}
 
static int kvm_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
    switch (attr->group) {
    case KVM_ARM_VM_SMCCC_CTRL:
        return kvm_vm_smccc_has_attr(kvm, attr);
    default:
        return -ENXIO;
    }
}
 
static int kvm_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
{
    switch (attr->group) {
    case KVM_ARM_VM_SMCCC_CTRL:
        return kvm_vm_smccc_set_attr(kvm, attr);
    default:
        return -ENXIO;
    }
}
 
int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
{
    struct kvm *kvm = filp->private_data;
    void __user *argp = (void __user *)arg;
    struct kvm_device_attr attr;
 
    switch (ioctl) {
    case KVM_CREATE_IRQCHIP: {
        int ret;
        if (!vgic_present)
            return -ENXIO;
        mutex_lock(&kvm->lock);
        ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
        mutex_unlock(&kvm->lock);
        return ret;
    }
    case KVM_ARM_SET_DEVICE_ADDR: {
        struct kvm_arm_device_addr dev_addr;
 
        if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
            return -EFAULT;
        return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
    }
    case KVM_ARM_PREFERRED_TARGET: {
        struct kvm_vcpu_init init = {
            .target = KVM_ARM_TARGET_GENERIC_V8,
        };
 
        if (copy_to_user(argp, &init, sizeof(init)))
            return -EFAULT;
 
        return 0;
    }
    case KVM_ARM_MTE_COPY_TAGS: {
        struct kvm_arm_copy_mte_tags copy_tags;
 
        if (copy_from_user(&copy_tags, argp, sizeof(copy_tags)))
            return -EFAULT;
        return kvm_vm_ioctl_mte_copy_tags(kvm, &copy_tags);
    }
    case KVM_ARM_SET_COUNTER_OFFSET: {
        struct kvm_arm_counter_offset offset;
 
        if (copy_from_user(&offset, argp, sizeof(offset)))
            return -EFAULT;
        return kvm_vm_ioctl_set_counter_offset(kvm, &offset);
    }
    case KVM_HAS_DEVICE_ATTR: {
        if (copy_from_user(&attr, argp, sizeof(attr)))
            return -EFAULT;
 
        return kvm_vm_has_attr(kvm, &attr);
    }
    case KVM_SET_DEVICE_ATTR: {
        if (copy_from_user(&attr, argp, sizeof(attr)))
            return -EFAULT;
 
        return kvm_vm_set_attr(kvm, &attr);
    }
    case KVM_ARM_GET_REG_WRITABLE_MASKS: {
        struct reg_mask_range range;
 
        if (copy_from_user(&range, argp, sizeof(range)))
            return -EFAULT;
        return kvm_vm_ioctl_get_reg_writable_masks(kvm, &range);
    }
    default:
        return -EINVAL;
    }
}
 
/* unlocks vcpus from @vcpu_lock_idx and smaller */
static void unlock_vcpus(struct kvm *kvm, int vcpu_lock_idx)
{
    struct kvm_vcpu *tmp_vcpu;
 
    for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
        tmp_vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
        mutex_unlock(&tmp_vcpu->mutex);
    }
}
 
void unlock_all_vcpus(struct kvm *kvm)
{
    lockdep_assert_held(&kvm->lock);
 
    unlock_vcpus(kvm, atomic_read(&kvm->online_vcpus) - 1);
}
 
/* Returns true if all vcpus were locked, false otherwise */
bool lock_all_vcpus(struct kvm *kvm)
{
    struct kvm_vcpu *tmp_vcpu;
    unsigned long c;
 
    lockdep_assert_held(&kvm->lock);
 
    /*
     * Any time a vcpu is in an ioctl (including running), the
     * core KVM code tries to grab the vcpu->mutex.
     *
     * By grabbing the vcpu->mutex of all VCPUs we ensure that no
     * other VCPUs can fiddle with the state while we access it.
     */
    kvm_for_each_vcpu(c, tmp_vcpu, kvm) {
        if (!mutex_trylock(&tmp_vcpu->mutex)) {
            unlock_vcpus(kvm, c - 1);
            return false;
        }
    }
 
    return true;
}
 
static unsigned long nvhe_percpu_size(void)
{
    return (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_end) -
        (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_start);
}
 
static unsigned long nvhe_percpu_order(void)
{
    unsigned long size = nvhe_percpu_size();
 
    return size ? get_order(size) : 0;
}
 
/* A lookup table holding the hypervisor VA for each vector slot */
static void *hyp_spectre_vector_selector[BP_HARDEN_EL2_SLOTS];
 
static void kvm_init_vector_slot(void *base, enum arm64_hyp_spectre_vector slot)
{
    hyp_spectre_vector_selector[slot] = __kvm_vector_slot2addr(base, slot);
}
 
static int kvm_init_vector_slots(void)
{
    int err;
    void *base;
 
    base = kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector));
    kvm_init_vector_slot(base, HYP_VECTOR_DIRECT);
 
    base = kern_hyp_va(kvm_ksym_ref(__bp_harden_hyp_vecs));
    kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_DIRECT);
 
    if (kvm_system_needs_idmapped_vectors() &&
        !is_protected_kvm_enabled()) {
        err = create_hyp_exec_mappings(__pa_symbol(__bp_harden_hyp_vecs),
                           __BP_HARDEN_HYP_VECS_SZ, &base);
        if (err)
            return err;
    }
 
    kvm_init_vector_slot(base, HYP_VECTOR_INDIRECT);
    kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_INDIRECT);
    return 0;
}
 
static void __init cpu_prepare_hyp_mode(int cpu, u32 hyp_va_bits)
{
    struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
    u64 mmfr0 = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
    unsigned long tcr;
 
    /*
     * Calculate the raw per-cpu offset without a translation from the
     * kernel's mapping to the linear mapping, and store it in tpidr_el2
     * so that we can use adr_l to access per-cpu variables in EL2.
     * Also drop the KASAN tag which gets in the way...
     */
    params->tpidr_el2 = (unsigned long)kasan_reset_tag(per_cpu_ptr_nvhe_sym(__per_cpu_start, cpu)) -
                (unsigned long)kvm_ksym_ref(CHOOSE_NVHE_SYM(__per_cpu_start));
 
    params->mair_el2 = read_sysreg(mair_el1);
 
    tcr = read_sysreg(tcr_el1);
    if (cpus_have_final_cap(ARM64_KVM_HVHE)) {
        tcr |= TCR_EPD1_MASK;
    } else {
        tcr &= TCR_EL2_MASK;
        tcr |= TCR_EL2_RES1;
    }
    tcr &= ~TCR_T0SZ_MASK;
    tcr |= TCR_T0SZ(hyp_va_bits);
    tcr &= ~TCR_EL2_PS_MASK;
    tcr |= FIELD_PREP(TCR_EL2_PS_MASK, kvm_get_parange(mmfr0));
    if (kvm_lpa2_is_enabled())
        tcr |= TCR_EL2_DS;
    params->tcr_el2 = tcr;
 
    params->pgd_pa = kvm_mmu_get_httbr();
    if (is_protected_kvm_enabled())
        params->hcr_el2 = HCR_HOST_NVHE_PROTECTED_FLAGS;
    else
        params->hcr_el2 = HCR_HOST_NVHE_FLAGS;
    if (cpus_have_final_cap(ARM64_KVM_HVHE))
        params->hcr_el2 |= HCR_E2H;
    params->vttbr = params->vtcr = 0;
 
    /*
     * Flush the init params from the data cache because the struct will
     * be read while the MMU is off.
     */
    kvm_flush_dcache_to_poc(params, sizeof(*params));
}
 
static void hyp_install_host_vector(void)
{
    struct kvm_nvhe_init_params *params;
    struct arm_smccc_res res;
 
    /* Switch from the HYP stub to our own HYP init vector */
    __hyp_set_vectors(kvm_get_idmap_vector());
 
    /*
     * Call initialization code, and switch to the full blown HYP code.
     * If the cpucaps haven't been finalized yet, something has gone very
     * wrong, and hyp will crash and burn when it uses any
     * cpus_have_*_cap() wrapper.
     */
    BUG_ON(!system_capabilities_finalized());
    params = this_cpu_ptr_nvhe_sym(kvm_init_params);
    arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(__kvm_hyp_init), virt_to_phys(params), &res);
    WARN_ON(res.a0 != SMCCC_RET_SUCCESS);
}
 
static void cpu_init_hyp_mode(void)
{
    hyp_install_host_vector();
 
    /*
     * Disabling SSBD on a non-VHE system requires us to enable SSBS
     * at EL2.
     */
    if (this_cpu_has_cap(ARM64_SSBS) &&
        arm64_get_spectre_v4_state() == SPECTRE_VULNERABLE) {
        kvm_call_hyp_nvhe(__kvm_enable_ssbs);
    }
}
 
static void cpu_hyp_reset(void)
{
    if (!is_kernel_in_hyp_mode())
        __hyp_reset_vectors();
}
 
/*
 * EL2 vectors can be mapped and rerouted in a number of ways,
 * depending on the kernel configuration and CPU present:
 *
 * - If the CPU is affected by Spectre-v2, the hardening sequence is
 *   placed in one of the vector slots, which is executed before jumping
 *   to the real vectors.
 *
 * - If the CPU also has the ARM64_SPECTRE_V3A cap, the slot
 *   containing the hardening sequence is mapped next to the idmap page,
 *   and executed before jumping to the real vectors.
 *
 * - If the CPU only has the ARM64_SPECTRE_V3A cap, then an
 *   empty slot is selected, mapped next to the idmap page, and
 *   executed before jumping to the real vectors.
 *
 * Note that ARM64_SPECTRE_V3A is somewhat incompatible with
 * VHE, as we don't have hypervisor-specific mappings. If the system
 * is VHE and yet selects this capability, it will be ignored.
 */
static void cpu_set_hyp_vector(void)
{
    struct bp_hardening_data *data = this_cpu_ptr(&bp_hardening_data);
    void *vector = hyp_spectre_vector_selector[data->slot];
 
    if (!is_protected_kvm_enabled())
        *this_cpu_ptr_hyp_sym(kvm_hyp_vector) = (unsigned long)vector;
    else
        kvm_call_hyp_nvhe(__pkvm_cpu_set_vector, data->slot);
}
 
static void cpu_hyp_init_context(void)
{
    kvm_init_host_cpu_context(&this_cpu_ptr_hyp_sym(kvm_host_data)->host_ctxt);
 
    if (!is_kernel_in_hyp_mode())
        cpu_init_hyp_mode();
}
 
static void cpu_hyp_init_features(void)
{
    cpu_set_hyp_vector();
    kvm_arm_init_debug();
 
    if (is_kernel_in_hyp_mode())
        kvm_timer_init_vhe();
 
    if (vgic_present)
        kvm_vgic_init_cpu_hardware();
}
 
static void cpu_hyp_reinit(void)
{
    cpu_hyp_reset();
    cpu_hyp_init_context();
    cpu_hyp_init_features();
}
 
static void cpu_hyp_init(void *discard)
{
    if (!__this_cpu_read(kvm_hyp_initialized)) {
        cpu_hyp_reinit();
        __this_cpu_write(kvm_hyp_initialized, 1);
    }
}
 
static void cpu_hyp_uninit(void *discard)
{
    if (__this_cpu_read(kvm_hyp_initialized)) {
        cpu_hyp_reset();
        __this_cpu_write(kvm_hyp_initialized, 0);
    }
}
 
int kvm_arch_hardware_enable(void)
{
    /*
     * Most calls to this function are made with migration
     * disabled, but not with preemption disabled. The former is
     * enough to ensure correctness, but most of the helpers
     * expect the later and will throw a tantrum otherwise.
     */
    preempt_disable();
 
    cpu_hyp_init(NULL);
 
    kvm_vgic_cpu_up();
    kvm_timer_cpu_up();
 
    preempt_enable();
 
    return 0;
}
 
void kvm_arch_hardware_disable(void)
{
    kvm_timer_cpu_down();
    kvm_vgic_cpu_down();
 
    if (!is_protected_kvm_enabled())
        cpu_hyp_uninit(NULL);
}
 
#ifdef CONFIG_CPU_PM
static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
                    unsigned long cmd,
                    void *v)
{
    /*
     * kvm_hyp_initialized is left with its old value over
     * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
     * re-enable hyp.
     */
    switch (cmd) {
    case CPU_PM_ENTER:
        if (__this_cpu_read(kvm_hyp_initialized))
            /*
             * don't update kvm_hyp_initialized here
             * so that the hyp will be re-enabled
             * when we resume. See below.
             */
            cpu_hyp_reset();
 
        return NOTIFY_OK;
    case CPU_PM_ENTER_FAILED:
    case CPU_PM_EXIT:
        if (__this_cpu_read(kvm_hyp_initialized))
            /* The hyp was enabled before suspend. */
            cpu_hyp_reinit();
 
        return NOTIFY_OK;
 
    default:
        return NOTIFY_DONE;
    }
}
 
static struct notifier_block hyp_init_cpu_pm_nb = {
    .notifier_call = hyp_init_cpu_pm_notifier,
};
 
static void __init hyp_cpu_pm_init(void)
{
    if (!is_protected_kvm_enabled())
        cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
}
static void __init hyp_cpu_pm_exit(void)
{
    if (!is_protected_kvm_enabled())
        cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
}
#else
static inline void __init hyp_cpu_pm_init(void)
{
}
static inline void __init hyp_cpu_pm_exit(void)
{
}
#endif
 
static void __init init_cpu_logical_map(void)
{
    unsigned int cpu;
 
    /*
     * Copy the MPIDR <-> logical CPU ID mapping to hyp.
     * Only copy the set of online CPUs whose features have been checked
     * against the finalized system capabilities. The hypervisor will not
     * allow any other CPUs from the `possible` set to boot.
     */
    for_each_online_cpu(cpu)
        hyp_cpu_logical_map[cpu] = cpu_logical_map(cpu);
}
 
#define init_psci_0_1_impl_state(config, what)  \
    config.psci_0_1_ ## what ## _implemented = psci_ops.what
 
static bool __init init_psci_relay(void)
{
    /*
     * If PSCI has not been initialized, protected KVM cannot install
     * itself on newly booted CPUs.
     */
    if (!psci_ops.get_version) {
        kvm_err("Cannot initialize protected mode without PSCI\n");
        return false;
    }
 
    kvm_host_psci_config.version = psci_ops.get_version();
    kvm_host_psci_config.smccc_version = arm_smccc_get_version();
 
    if (kvm_host_psci_config.version == PSCI_VERSION(0, 1)) {
        kvm_host_psci_config.function_ids_0_1 = get_psci_0_1_function_ids();
        init_psci_0_1_impl_state(kvm_host_psci_config, cpu_suspend);
        init_psci_0_1_impl_state(kvm_host_psci_config, cpu_on);
        init_psci_0_1_impl_state(kvm_host_psci_config, cpu_off);
        init_psci_0_1_impl_state(kvm_host_psci_config, migrate);
    }
    return true;
}
 
static int __init init_subsystems(void)
{
    int err = 0;
 
    /*
     * Enable hardware so that subsystem initialisation can access EL2.
     */
    on_each_cpu(cpu_hyp_init, NULL, 1);
 
    /*
     * Register CPU lower-power notifier
     */
    hyp_cpu_pm_init();
 
    /*
     * Init HYP view of VGIC
     */
    err = kvm_vgic_hyp_init();
    switch (err) {
    case 0:
        vgic_present = true;
        break;
    case -ENODEV:
    case -ENXIO:
        vgic_present = false;
        err = 0;
        break;
    default:
        goto out;
    }
 
    /*
     * Init HYP architected timer support
     */
    err = kvm_timer_hyp_init(vgic_present);
    if (err)
        goto out;
 
    kvm_register_perf_callbacks(NULL);
 
out:
    if (err)
        hyp_cpu_pm_exit();
 
    if (err || !is_protected_kvm_enabled())
        on_each_cpu(cpu_hyp_uninit, NULL, 1);
 
    return err;
}
 
static void __init teardown_subsystems(void)
{
    kvm_unregister_perf_callbacks();
    hyp_cpu_pm_exit();
}
 
static void __init teardown_hyp_mode(void)
{
    int cpu;
 
    free_hyp_pgds();
    for_each_possible_cpu(cpu) {
        free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
        free_pages(kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu], nvhe_percpu_order());
    }
}
 
static int __init do_pkvm_init(u32 hyp_va_bits)
{
    void *per_cpu_base = kvm_ksym_ref(kvm_nvhe_sym(kvm_arm_hyp_percpu_base));
    int ret;
 
    preempt_disable();
    cpu_hyp_init_context();
    ret = kvm_call_hyp_nvhe(__pkvm_init, hyp_mem_base, hyp_mem_size,
                num_possible_cpus(), kern_hyp_va(per_cpu_base),
                hyp_va_bits);
    cpu_hyp_init_features();
 
    /*
     * The stub hypercalls are now disabled, so set our local flag to
     * prevent a later re-init attempt in kvm_arch_hardware_enable().
     */
    __this_cpu_write(kvm_hyp_initialized, 1);
    preempt_enable();
 
    return ret;
}
 
static u64 get_hyp_id_aa64pfr0_el1(void)
{
    /*
     * Track whether the system isn't affected by spectre/meltdown in the
     * hypervisor's view of id_aa64pfr0_el1, used for protected VMs.
     * Although this is per-CPU, we make it global for simplicity, e.g., not
     * to have to worry about vcpu migration.
     *
     * Unlike for non-protected VMs, userspace cannot override this for
     * protected VMs.
     */
    u64 val = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
 
    val &= ~(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2) |
         ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3));
 
    val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2),
              arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED);
    val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3),
              arm64_get_meltdown_state() == SPECTRE_UNAFFECTED);
 
    return val;
}
 
static void kvm_hyp_init_symbols(void)
{
    kvm_nvhe_sym(id_aa64pfr0_el1_sys_val) = get_hyp_id_aa64pfr0_el1();
    kvm_nvhe_sym(id_aa64pfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1);
    kvm_nvhe_sym(id_aa64isar0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR0_EL1);
    kvm_nvhe_sym(id_aa64isar1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR1_EL1);
    kvm_nvhe_sym(id_aa64isar2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR2_EL1);
    kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
    kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
    kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR2_EL1);
    kvm_nvhe_sym(id_aa64smfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64SMFR0_EL1);
    kvm_nvhe_sym(__icache_flags) = __icache_flags;
    kvm_nvhe_sym(kvm_arm_vmid_bits) = kvm_arm_vmid_bits;
}
 
static int __init kvm_hyp_init_protection(u32 hyp_va_bits)
{
    void *addr = phys_to_virt(hyp_mem_base);
    int ret;
 
    ret = create_hyp_mappings(addr, addr + hyp_mem_size, PAGE_HYP);
    if (ret)
        return ret;
 
    ret = do_pkvm_init(hyp_va_bits);
    if (ret)
        return ret;
 
    free_hyp_pgds();
 
    return 0;
}
 
static void pkvm_hyp_init_ptrauth(void)
{
    struct kvm_cpu_context *hyp_ctxt;
    int cpu;
 
    for_each_possible_cpu(cpu) {
        hyp_ctxt = per_cpu_ptr_nvhe_sym(kvm_hyp_ctxt, cpu);
        hyp_ctxt->sys_regs[APIAKEYLO_EL1] = get_random_long();
        hyp_ctxt->sys_regs[APIAKEYHI_EL1] = get_random_long();
        hyp_ctxt->sys_regs[APIBKEYLO_EL1] = get_random_long();
        hyp_ctxt->sys_regs[APIBKEYHI_EL1] = get_random_long();
        hyp_ctxt->sys_regs[APDAKEYLO_EL1] = get_random_long();
        hyp_ctxt->sys_regs[APDAKEYHI_EL1] = get_random_long();
        hyp_ctxt->sys_regs[APDBKEYLO_EL1] = get_random_long();
        hyp_ctxt->sys_regs[APDBKEYHI_EL1] = get_random_long();
        hyp_ctxt->sys_regs[APGAKEYLO_EL1] = get_random_long();
        hyp_ctxt->sys_regs[APGAKEYHI_EL1] = get_random_long();
    }
}
 
/* Inits Hyp-mode on all online CPUs */
static int __init init_hyp_mode(void)
{
    u32 hyp_va_bits;
    int cpu;
    int err = -ENOMEM;
 
    /*
     * The protected Hyp-mode cannot be initialized if the memory pool
     * allocation has failed.
     */
    if (is_protected_kvm_enabled() && !hyp_mem_base)
        goto out_err;
 
    /*
     * Allocate Hyp PGD and setup Hyp identity mapping
     */
    err = kvm_mmu_init(&hyp_va_bits);
    if (err)
        goto out_err;
 
    /*
     * Allocate stack pages for Hypervisor-mode
     */
    for_each_possible_cpu(cpu) {
        unsigned long stack_page;
 
        stack_page = __get_free_page(GFP_KERNEL);
        if (!stack_page) {
            err = -ENOMEM;
            goto out_err;
        }
 
        per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
    }
 
    /*
     * Allocate and initialize pages for Hypervisor-mode percpu regions.
     */
    for_each_possible_cpu(cpu) {
        struct page *page;
        void *page_addr;
 
        page = alloc_pages(GFP_KERNEL, nvhe_percpu_order());
        if (!page) {
            err = -ENOMEM;
            goto out_err;
        }
 
        page_addr = page_address(page);
        memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size());
        kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu] = (unsigned long)page_addr;
    }
 
    /*
     * Map the Hyp-code called directly from the host
     */
    err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
                  kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
    if (err) {
        kvm_err("Cannot map world-switch code\n");
        goto out_err;
    }
 
    err = create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start),
                  kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO);
    if (err) {
        kvm_err("Cannot map .hyp.rodata section\n");
        goto out_err;
    }
 
    err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
                  kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
    if (err) {
        kvm_err("Cannot map rodata section\n");
        goto out_err;
    }
 
    /*
     * .hyp.bss is guaranteed to be placed at the beginning of the .bss
     * section thanks to an assertion in the linker script. Map it RW and
     * the rest of .bss RO.
     */
    err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_start),
                  kvm_ksym_ref(__hyp_bss_end), PAGE_HYP);
    if (err) {
        kvm_err("Cannot map hyp bss section: %d\n", err);
        goto out_err;
    }
 
    err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_end),
                  kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
    if (err) {
        kvm_err("Cannot map bss section\n");
        goto out_err;
    }
 
    /*
     * Map the Hyp stack pages
     */
    for_each_possible_cpu(cpu) {
        struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
        char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
 
        err = create_hyp_stack(__pa(stack_page), &params->stack_hyp_va);
        if (err) {
            kvm_err("Cannot map hyp stack\n");
            goto out_err;
        }
 
        /*
         * Save the stack PA in nvhe_init_params. This will be needed
         * to recreate the stack mapping in protected nVHE mode.
         * __hyp_pa() won't do the right thing there, since the stack
         * has been mapped in the flexible private VA space.
         */
        params->stack_pa = __pa(stack_page);
    }
 
    for_each_possible_cpu(cpu) {
        char *percpu_begin = (char *)kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu];
        char *percpu_end = percpu_begin + nvhe_percpu_size();
 
        /* Map Hyp percpu pages */
        err = create_hyp_mappings(percpu_begin, percpu_end, PAGE_HYP);
        if (err) {
            kvm_err("Cannot map hyp percpu region\n");
            goto out_err;
        }
 
        /* Prepare the CPU initialization parameters */
        cpu_prepare_hyp_mode(cpu, hyp_va_bits);
    }
 
    kvm_hyp_init_symbols();
 
    if (is_protected_kvm_enabled()) {
        if (IS_ENABLED(CONFIG_ARM64_PTR_AUTH_KERNEL) &&
            cpus_have_final_cap(ARM64_HAS_ADDRESS_AUTH))
            pkvm_hyp_init_ptrauth();
 
        init_cpu_logical_map();
 
        if (!init_psci_relay()) {
            err = -ENODEV;
            goto out_err;
        }
 
        err = kvm_hyp_init_protection(hyp_va_bits);
        if (err) {
            kvm_err("Failed to init hyp memory protection\n");
            goto out_err;
        }
    }
 
    return 0;
 
out_err:
    teardown_hyp_mode();
    kvm_err("error initializing Hyp mode: %d\n", err);
    return err;
}
 
struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
{
    struct kvm_vcpu *vcpu;
    unsigned long i;
 
    mpidr &= MPIDR_HWID_BITMASK;
 
    if (kvm->arch.mpidr_data) {
        u16 idx = kvm_mpidr_index(kvm->arch.mpidr_data, mpidr);
 
        vcpu = kvm_get_vcpu(kvm,
                    kvm->arch.mpidr_data->cmpidr_to_idx[idx]);
        if (mpidr != kvm_vcpu_get_mpidr_aff(vcpu))
            vcpu = NULL;
 
        return vcpu;
    }
 
    kvm_for_each_vcpu(i, vcpu, kvm) {
        if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
            return vcpu;
    }
    return NULL;
}
 
bool kvm_arch_irqchip_in_kernel(struct kvm *kvm)
{
    return irqchip_in_kernel(kvm);
}
 
bool kvm_arch_has_irq_bypass(void)
{
    return true;
}
 
int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
                      struct irq_bypass_producer *prod)
{
    struct kvm_kernel_irqfd *irqfd =
        container_of(cons, struct kvm_kernel_irqfd, consumer);
 
    return kvm_vgic_v4_set_forwarding(irqfd->kvm, prod->irq,
                      &irqfd->irq_entry);
}
void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
                      struct irq_bypass_producer *prod)
{
    struct kvm_kernel_irqfd *irqfd =
        container_of(cons, struct kvm_kernel_irqfd, consumer);
 
    kvm_vgic_v4_unset_forwarding(irqfd->kvm, prod->irq,
                     &irqfd->irq_entry);
}
 
void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
{
    struct kvm_kernel_irqfd *irqfd =
        container_of(cons, struct kvm_kernel_irqfd, consumer);
 
    kvm_arm_halt_guest(irqfd->kvm);
}
 
void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
{
    struct kvm_kernel_irqfd *irqfd =
        container_of(cons, struct kvm_kernel_irqfd, consumer);
 
    kvm_arm_resume_guest(irqfd->kvm);
}
 
/* Initialize Hyp-mode and memory mappings on all CPUs */
static __init int kvm_arm_init(void)
{
    int err;
    bool in_hyp_mode;
 
    if (!is_hyp_mode_available()) {
        kvm_info("HYP mode not available\n");
        return -ENODEV;
    }
 
    if (kvm_get_mode() == KVM_MODE_NONE) {
        kvm_info("KVM disabled from command line\n");
        return -ENODEV;
    }
 
    err = kvm_sys_reg_table_init();
    if (err) {
        kvm_info("Error initializing system register tables");
        return err;
    }
 
    in_hyp_mode = is_kernel_in_hyp_mode();
 
    if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) ||
        cpus_have_final_cap(ARM64_WORKAROUND_1508412))
        kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \
             "Only trusted guests should be used on this system.\n");
 
    err = kvm_set_ipa_limit();
    if (err)
        return err;
 
    err = kvm_arm_init_sve();
    if (err)
        return err;
 
    err = kvm_arm_vmid_alloc_init();
    if (err) {
        kvm_err("Failed to initialize VMID allocator.\n");
        return err;
    }
 
    if (!in_hyp_mode) {
        err = init_hyp_mode();
        if (err)
            goto out_err;
    }
 
    err = kvm_init_vector_slots();
    if (err) {
        kvm_err("Cannot initialise vector slots\n");
        goto out_hyp;
    }
 
    err = init_subsystems();
    if (err)
        goto out_hyp;
 
    if (is_protected_kvm_enabled()) {
        kvm_info("Protected nVHE mode initialized successfully\n");
    } else if (in_hyp_mode) {
        kvm_info("VHE mode initialized successfully\n");
    } else {
        kvm_info("Hyp mode initialized successfully\n");
    }
 
    /*
     * FIXME: Do something reasonable if kvm_init() fails after pKVM
     * hypervisor protection is finalized.
     */
    err = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE);
    if (err)
        goto out_subs;
 
    kvm_arm_initialised = true;
 
    return 0;
 
out_subs:
    teardown_subsystems();
out_hyp:
    if (!in_hyp_mode)
        teardown_hyp_mode();
out_err:
    kvm_arm_vmid_alloc_free();
    return err;
}
 
static int __init early_kvm_mode_cfg(char *arg)
{
    if (!arg)
        return -EINVAL;
 
    if (strcmp(arg, "none") == 0) {
        kvm_mode = KVM_MODE_NONE;
        return 0;
    }
 
    if (!is_hyp_mode_available()) {
        pr_warn_once("KVM is not available. Ignoring kvm-arm.mode\n");
        return 0;
    }
 
    if (strcmp(arg, "protected") == 0) {
        if (!is_kernel_in_hyp_mode())
            kvm_mode = KVM_MODE_PROTECTED;
        else
            pr_warn_once("Protected KVM not available with VHE\n");
 
        return 0;
    }
 
    if (strcmp(arg, "nvhe") == 0 && !WARN_ON(is_kernel_in_hyp_mode())) {
        kvm_mode = KVM_MODE_DEFAULT;
        return 0;
    }
 
    if (strcmp(arg, "nested") == 0 && !WARN_ON(!is_kernel_in_hyp_mode())) {
        kvm_mode = KVM_MODE_NV;
        return 0;
    }
 
    return -EINVAL;
}
early_param("kvm-arm.mode", early_kvm_mode_cfg);
 
enum kvm_mode kvm_get_mode(void)
{
    return kvm_mode;
}
 
module_init(kvm_arm_init);