v4.19.13 snapshot.
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
new file mode 100644
index 0000000..8fb31a7
--- /dev/null
+++ b/virt/kvm/arm/arm.c
@@ -0,0 +1,1700 @@
+/*
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include <linux/bug.h>
+#include <linux/cpu_pm.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 <trace/events/kvm.h>
+#include <kvm/arm_pmu.h>
+#include <kvm/arm_psci.h>
+
+#define CREATE_TRACE_POINTS
+#include "trace.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_emulate.h>
+#include <asm/kvm_coproc.h>
+#include <asm/sections.h>
+
+#ifdef REQUIRES_VIRT
+__asm__(".arch_extension virt");
+#endif
+
+DEFINE_PER_CPU(kvm_cpu_context_t, kvm_host_cpu_state);
+static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
+
+/* Per-CPU variable containing the currently running vcpu. */
+static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
+
+/* The VMID used in the VTTBR */
+static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
+static u32 kvm_next_vmid;
+static unsigned int kvm_vmid_bits __read_mostly;
+static DEFINE_RWLOCK(kvm_vmid_lock);
+
+static bool vgic_present;
+
+static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
+
+static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
+{
+ __this_cpu_write(kvm_arm_running_vcpu, vcpu);
+}
+
+DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
+
+/**
+ * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
+ * Must be called from non-preemptible context
+ */
+struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
+{
+ return __this_cpu_read(kvm_arm_running_vcpu);
+}
+
+/**
+ * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
+ */
+struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
+{
+ return &kvm_arm_running_vcpu;
+}
+
+int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
+{
+ return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
+}
+
+int kvm_arch_hardware_setup(void)
+{
+ return 0;
+}
+
+void kvm_arch_check_processor_compat(void *rtn)
+{
+ *(int *)rtn = 0;
+}
+
+
+/**
+ * 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, cpu;
+
+ if (type)
+ return -EINVAL;
+
+ kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran));
+ if (!kvm->arch.last_vcpu_ran)
+ return -ENOMEM;
+
+ for_each_possible_cpu(cpu)
+ *per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1;
+
+ ret = kvm_alloc_stage2_pgd(kvm);
+ if (ret)
+ goto out_fail_alloc;
+
+ ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
+ if (ret)
+ goto out_free_stage2_pgd;
+
+ kvm_vgic_early_init(kvm);
+
+ /* Mark the initial VMID generation invalid */
+ kvm->arch.vmid_gen = 0;
+
+ /* The maximum number of VCPUs is limited by the host's GIC model */
+ kvm->arch.max_vcpus = vgic_present ?
+ kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
+
+ return ret;
+out_free_stage2_pgd:
+ kvm_free_stage2_pgd(kvm);
+out_fail_alloc:
+ free_percpu(kvm->arch.last_vcpu_ran);
+ kvm->arch.last_vcpu_ran = NULL;
+ return ret;
+}
+
+bool kvm_arch_has_vcpu_debugfs(void)
+{
+ return false;
+}
+
+int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
+{
+ return 0;
+}
+
+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)
+{
+ int i;
+
+ kvm_vgic_destroy(kvm);
+
+ free_percpu(kvm->arch.last_vcpu_ran);
+ kvm->arch.last_vcpu_ran = NULL;
+
+ for (i = 0; i < KVM_MAX_VCPUS; ++i) {
+ if (kvm->vcpus[i]) {
+ kvm_arch_vcpu_free(kvm->vcpus[i]);
+ kvm->vcpus[i] = NULL;
+ }
+ }
+ atomic_set(&kvm->online_vcpus, 0);
+}
+
+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_DEVICE_CTRL:
+ 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:
+ r = 1;
+ break;
+ case KVM_CAP_ARM_SET_DEVICE_ADDR:
+ r = 1;
+ break;
+ case KVM_CAP_NR_VCPUS:
+ r = num_online_cpus();
+ break;
+ case KVM_CAP_MAX_VCPUS:
+ r = KVM_MAX_VCPUS;
+ break;
+ case KVM_CAP_NR_MEMSLOTS:
+ r = KVM_USER_MEM_SLOTS;
+ 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;
+ default:
+ r = kvm_arch_dev_ioctl_check_extension(kvm, ext);
+ break;
+ }
+ 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)
+{
+ if (!has_vhe())
+ return kzalloc(sizeof(struct kvm), GFP_KERNEL);
+
+ return vzalloc(sizeof(struct kvm));
+}
+
+void kvm_arch_free_vm(struct kvm *kvm)
+{
+ if (!has_vhe())
+ kfree(kvm);
+ else
+ vfree(kvm);
+}
+
+struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
+{
+ int err;
+ struct kvm_vcpu *vcpu;
+
+ if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
+ err = -EBUSY;
+ goto out;
+ }
+
+ if (id >= kvm->arch.max_vcpus) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
+ if (!vcpu) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = kvm_vcpu_init(vcpu, kvm, id);
+ if (err)
+ goto free_vcpu;
+
+ err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
+ if (err)
+ goto vcpu_uninit;
+
+ return vcpu;
+vcpu_uninit:
+ kvm_vcpu_uninit(vcpu);
+free_vcpu:
+ kmem_cache_free(kvm_vcpu_cache, vcpu);
+out:
+ return ERR_PTR(err);
+}
+
+void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
+{
+}
+
+void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
+{
+ if (vcpu->arch.has_run_once && unlikely(!irqchip_in_kernel(vcpu->kvm)))
+ static_branch_dec(&userspace_irqchip_in_use);
+
+ kvm_mmu_free_memory_caches(vcpu);
+ kvm_timer_vcpu_terminate(vcpu);
+ kvm_pmu_vcpu_destroy(vcpu);
+ kvm_vcpu_uninit(vcpu);
+ kmem_cache_free(kvm_vcpu_cache, vcpu);
+}
+
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+ kvm_arch_vcpu_free(vcpu);
+}
+
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+ return kvm_timer_is_pending(vcpu);
+}
+
+void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
+{
+ kvm_timer_schedule(vcpu);
+ kvm_vgic_v4_enable_doorbell(vcpu);
+}
+
+void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
+{
+ kvm_timer_unschedule(vcpu);
+ kvm_vgic_v4_disable_doorbell(vcpu);
+}
+
+int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
+{
+ /* Force users to call KVM_ARM_VCPU_INIT */
+ vcpu->arch.target = -1;
+ bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
+
+ /* Set up the timer */
+ kvm_timer_vcpu_init(vcpu);
+
+ kvm_arm_reset_debug_ptr(vcpu);
+
+ return kvm_vgic_vcpu_init(vcpu);
+}
+
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+ int *last_ran;
+
+ last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
+
+ /*
+ * We might get preempted before the vCPU actually runs, but
+ * over-invalidation doesn't affect correctness.
+ */
+ if (*last_ran != vcpu->vcpu_id) {
+ kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu);
+ *last_ran = vcpu->vcpu_id;
+ }
+
+ vcpu->cpu = cpu;
+ vcpu->arch.host_cpu_context = this_cpu_ptr(&kvm_host_cpu_state);
+
+ kvm_arm_set_running_vcpu(vcpu);
+ kvm_vgic_load(vcpu);
+ kvm_timer_vcpu_load(vcpu);
+ kvm_vcpu_load_sysregs(vcpu);
+ kvm_arch_vcpu_load_fp(vcpu);
+
+ if (single_task_running())
+ vcpu_clear_wfe_traps(vcpu);
+ else
+ vcpu_set_wfe_traps(vcpu);
+}
+
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+ kvm_arch_vcpu_put_fp(vcpu);
+ kvm_vcpu_put_sysregs(vcpu);
+ kvm_timer_vcpu_put(vcpu);
+ kvm_vgic_put(vcpu);
+
+ vcpu->cpu = -1;
+
+ kvm_arm_set_running_vcpu(NULL);
+}
+
+static void vcpu_power_off(struct kvm_vcpu *vcpu)
+{
+ vcpu->arch.power_off = true;
+ kvm_make_request(KVM_REQ_SLEEP, vcpu);
+ kvm_vcpu_kick(vcpu);
+}
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+{
+ if (vcpu->arch.power_off)
+ mp_state->mp_state = KVM_MP_STATE_STOPPED;
+ else
+ mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
+
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+{
+ int ret = 0;
+
+ switch (mp_state->mp_state) {
+ case KVM_MP_STATE_RUNNABLE:
+ vcpu->arch.power_off = false;
+ break;
+ case KVM_MP_STATE_STOPPED:
+ vcpu_power_off(vcpu);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ 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))
+ && !v->arch.power_off && !v->arch.pause);
+}
+
+bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
+{
+ return vcpu_mode_priv(vcpu);
+}
+
+/* Just ensure a guest exit from a particular CPU */
+static void exit_vm_noop(void *info)
+{
+}
+
+void force_vm_exit(const cpumask_t *mask)
+{
+ preempt_disable();
+ smp_call_function_many(mask, exit_vm_noop, NULL, true);
+ preempt_enable();
+}
+
+/**
+ * need_new_vmid_gen - check that the VMID is still valid
+ * @kvm: The VM's VMID to check
+ *
+ * return true if there is a new generation of VMIDs being used
+ *
+ * The hardware supports only 256 values with the value zero reserved for the
+ * host, so we check if an assigned value belongs to a previous generation,
+ * which which requires us to assign a new value. If we're the first to use a
+ * VMID for the new generation, we must flush necessary caches and TLBs on all
+ * CPUs.
+ */
+static bool need_new_vmid_gen(struct kvm *kvm)
+{
+ return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen));
+}
+
+/**
+ * update_vttbr - Update the VTTBR with a valid VMID before the guest runs
+ * @kvm The guest that we are about to run
+ *
+ * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the
+ * VM has a valid VMID, otherwise assigns a new one and flushes corresponding
+ * caches and TLBs.
+ */
+static void update_vttbr(struct kvm *kvm)
+{
+ phys_addr_t pgd_phys;
+ u64 vmid;
+ bool new_gen;
+
+ read_lock(&kvm_vmid_lock);
+ new_gen = need_new_vmid_gen(kvm);
+ read_unlock(&kvm_vmid_lock);
+
+ if (!new_gen)
+ return;
+
+ write_lock(&kvm_vmid_lock);
+
+ /*
+ * We need to re-check the vmid_gen here to ensure that if another vcpu
+ * already allocated a valid vmid for this vm, then this vcpu should
+ * use the same vmid.
+ */
+ if (!need_new_vmid_gen(kvm)) {
+ write_unlock(&kvm_vmid_lock);
+ return;
+ }
+
+ /* First user of a new VMID generation? */
+ if (unlikely(kvm_next_vmid == 0)) {
+ atomic64_inc(&kvm_vmid_gen);
+ kvm_next_vmid = 1;
+
+ /*
+ * On SMP we know no other CPUs can use this CPU's or each
+ * other's VMID after force_vm_exit returns since the
+ * kvm_vmid_lock blocks them from reentry to the guest.
+ */
+ force_vm_exit(cpu_all_mask);
+ /*
+ * Now broadcast TLB + ICACHE invalidation over the inner
+ * shareable domain to make sure all data structures are
+ * clean.
+ */
+ kvm_call_hyp(__kvm_flush_vm_context);
+ }
+
+ kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen);
+ kvm->arch.vmid = kvm_next_vmid;
+ kvm_next_vmid++;
+ kvm_next_vmid &= (1 << kvm_vmid_bits) - 1;
+
+ /* update vttbr to be used with the new vmid */
+ pgd_phys = virt_to_phys(kvm->arch.pgd);
+ BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK);
+ vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits);
+ kvm->arch.vttbr = kvm_phys_to_vttbr(pgd_phys) | vmid;
+
+ write_unlock(&kvm_vmid_lock);
+}
+
+static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+ int ret = 0;
+
+ if (likely(vcpu->arch.has_run_once))
+ return 0;
+
+ vcpu->arch.has_run_once = true;
+
+ if (likely(irqchip_in_kernel(kvm))) {
+ /*
+ * Map the VGIC hardware resources before running a vcpu the
+ * first time on this VM.
+ */
+ if (unlikely(!vgic_ready(kvm))) {
+ ret = kvm_vgic_map_resources(kvm);
+ if (ret)
+ return ret;
+ }
+ } else {
+ /*
+ * Tell the rest of the code that there are userspace irqchip
+ * VMs in the wild.
+ */
+ static_branch_inc(&userspace_irqchip_in_use);
+ }
+
+ ret = kvm_timer_enable(vcpu);
+ if (ret)
+ return ret;
+
+ ret = kvm_arm_pmu_v3_enable(vcpu);
+
+ return ret;
+}
+
+bool kvm_arch_intc_initialized(struct kvm *kvm)
+{
+ return vgic_initialized(kvm);
+}
+
+void kvm_arm_halt_guest(struct kvm *kvm)
+{
+ int 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)
+{
+ int i;
+ struct kvm_vcpu *vcpu;
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ vcpu->arch.pause = false;
+ swake_up_one(kvm_arch_vcpu_wq(vcpu));
+ }
+}
+
+static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
+{
+ struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
+
+ swait_event_interruptible_exclusive(*wq, ((!vcpu->arch.power_off) &&
+ (!vcpu->arch.pause)));
+
+ if (vcpu->arch.power_off || vcpu->arch.pause) {
+ /* Awaken to handle a signal, request we sleep again later. */
+ kvm_make_request(KVM_REQ_SLEEP, vcpu);
+ }
+}
+
+static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
+{
+ return vcpu->arch.target >= 0;
+}
+
+static void check_vcpu_requests(struct kvm_vcpu *vcpu)
+{
+ if (kvm_request_pending(vcpu)) {
+ if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
+ vcpu_req_sleep(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);
+ }
+}
+
+/**
+ * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
+ * @vcpu: The VCPU pointer
+ * @run: The kvm_run structure pointer used for userspace state exchange
+ *
+ * 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)
+{
+ int ret;
+
+ if (unlikely(!kvm_vcpu_initialized(vcpu)))
+ return -ENOEXEC;
+
+ ret = kvm_vcpu_first_run_init(vcpu);
+ if (ret)
+ return ret;
+
+ if (run->exit_reason == KVM_EXIT_MMIO) {
+ ret = kvm_handle_mmio_return(vcpu, vcpu->run);
+ if (ret)
+ return ret;
+ if (kvm_arm_handle_step_debug(vcpu, vcpu->run))
+ return 0;
+ }
+
+ if (run->immediate_exit)
+ return -EINTR;
+
+ vcpu_load(vcpu);
+
+ kvm_sigset_activate(vcpu);
+
+ ret = 1;
+ run->exit_reason = KVM_EXIT_UNKNOWN;
+ while (ret > 0) {
+ /*
+ * Check conditions before entering the guest
+ */
+ cond_resched();
+
+ update_vttbr(vcpu->kvm);
+
+ 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();
+
+ kvm_pmu_flush_hwstate(vcpu);
+
+ local_irq_disable();
+
+ kvm_vgic_flush_hwstate(vcpu);
+
+ /*
+ * Exit if we have a signal pending so that we can deliver the
+ * signal to user space.
+ */
+ if (signal_pending(current)) {
+ ret = -EINTR;
+ run->exit_reason = KVM_EXIT_INTR;
+ }
+
+ /*
+ * 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;
+ }
+ }
+
+ /*
+ * 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/virtual/kvm/vcpu-requests.rst
+ */
+ smp_store_mb(vcpu->mode, IN_GUEST_MODE);
+
+ if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) ||
+ kvm_request_pending(vcpu)) {
+ 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_hwstate(vcpu);
+ kvm_vgic_sync_hwstate(vcpu);
+ local_irq_enable();
+ preempt_enable();
+ continue;
+ }
+
+ kvm_arm_setup_debug(vcpu);
+
+ /**************************************************************
+ * Enter the guest
+ */
+ trace_kvm_entry(*vcpu_pc(vcpu));
+ guest_enter_irqoff();
+
+ if (has_vhe()) {
+ kvm_arm_vhe_guest_enter();
+ ret = kvm_vcpu_run_vhe(vcpu);
+ kvm_arm_vhe_guest_exit();
+ } else {
+ ret = kvm_call_hyp(__kvm_vcpu_run_nvhe, 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_hwstate(vcpu);
+
+ kvm_arch_vcpu_ctxsync_fp(vcpu);
+
+ /*
+ * We may have taken a host interrupt in HYP mode (ie
+ * while executing the guest). This interrupt is still
+ * pending, as we haven't serviced it yet!
+ *
+ * We're now back in SVC mode, with interrupts
+ * disabled. Enabling the interrupts now will have
+ * the effect of taking the interrupt again, in SVC
+ * mode this time.
+ */
+ local_irq_enable();
+
+ /*
+ * We do local_irq_enable() before calling guest_exit() so
+ * that if a timer interrupt hits while running the guest we
+ * account that tick as being spent in the guest. We enable
+ * preemption after calling guest_exit() so that if we get
+ * preempted we make sure ticks after that is not counted as
+ * guest time.
+ */
+ guest_exit();
+ 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, run, ret);
+
+ preempt_enable();
+
+ ret = handle_exit(vcpu, run, 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);
+
+ 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_idx, irq_num;
+ int nrcpus = atomic_read(&kvm->online_vcpus);
+ struct kvm_vcpu *vcpu = NULL;
+ bool level = irq_level->level;
+
+ irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
+ vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
+ irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
+
+ trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
+
+ switch (irq_type) {
+ case KVM_ARM_IRQ_TYPE_CPU:
+ if (irqchip_in_kernel(kvm))
+ return -ENXIO;
+
+ if (vcpu_idx >= nrcpus)
+ return -EINVAL;
+
+ vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+ 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;
+
+ if (vcpu_idx >= nrcpus)
+ return -EINVAL;
+
+ vcpu = kvm_get_vcpu(kvm, vcpu_idx);
+ 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->vcpu_id, 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, 0, irq_num, level, NULL);
+ }
+
+ return -EINVAL;
+}
+
+static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
+ const struct kvm_vcpu_init *init)
+{
+ unsigned int i;
+ int phys_target = kvm_target_cpu();
+
+ if (init->target != phys_target)
+ return -EINVAL;
+
+ /*
+ * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
+ * use the same target.
+ */
+ if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
+ return -EINVAL;
+
+ /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
+ for (i = 0; i < sizeof(init->features) * 8; i++) {
+ bool set = (init->features[i / 32] & (1 << (i % 32)));
+
+ if (set && i >= KVM_VCPU_MAX_FEATURES)
+ return -ENOENT;
+
+ /*
+ * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
+ * use the same feature set.
+ */
+ if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
+ test_bit(i, vcpu->arch.features) != set)
+ return -EINVAL;
+
+ if (set)
+ set_bit(i, vcpu->arch.features);
+ }
+
+ vcpu->arch.target = phys_target;
+
+ /* Now we know what it is, we can reset it. */
+ return kvm_reset_vcpu(vcpu);
+}
+
+
+static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
+ struct kvm_vcpu_init *init)
+{
+ int ret;
+
+ 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.
+ */
+ if (vcpu->arch.has_run_once)
+ stage2_unmap_vm(vcpu->kvm);
+
+ vcpu_reset_hcr(vcpu);
+
+ /*
+ * Handle the "start in power-off" case.
+ */
+ if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
+ vcpu_power_off(vcpu);
+ else
+ vcpu->arch.power_off = false;
+
+ 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(®, argp, sizeof(reg)))
+ break;
+
+ if (ioctl == KVM_SET_ONE_REG)
+ r = kvm_arm_set_reg(vcpu, ®);
+ else
+ r = kvm_arm_get_reg(vcpu, ®);
+ 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 = -EFAULT;
+ if (copy_from_user(®_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, ®_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);
+ }
+ default:
+ r = -EINVAL;
+ }
+
+ return r;
+}
+
+/**
+ * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
+ * @kvm: kvm instance
+ * @log: slot id and address to which we copy the log
+ *
+ * Steps 1-4 below provide general overview of dirty page logging. See
+ * kvm_get_dirty_log_protect() function description for additional details.
+ *
+ * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
+ * always flush the TLB (step 4) even if previous step failed and the dirty
+ * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
+ * does not preclude user space subsequent dirty log read. Flushing TLB ensures
+ * writes will be marked dirty for next log read.
+ *
+ * 1. Take a snapshot of the bit and clear it if needed.
+ * 2. Write protect the corresponding page.
+ * 3. Copy the snapshot to the userspace.
+ * 4. Flush TLB's if needed.
+ */
+int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
+{
+ bool is_dirty = false;
+ int r;
+
+ mutex_lock(&kvm->slots_lock);
+
+ r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
+
+ if (is_dirty)
+ kvm_flush_remote_tlbs(kvm);
+
+ mutex_unlock(&kvm->slots_lock);
+ return r;
+}
+
+static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
+ struct kvm_arm_device_addr *dev_addr)
+{
+ unsigned long dev_id, type;
+
+ dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
+ KVM_ARM_DEVICE_ID_SHIFT;
+ type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
+ KVM_ARM_DEVICE_TYPE_SHIFT;
+
+ switch (dev_id) {
+ case KVM_ARM_DEVICE_VGIC_V2:
+ if (!vgic_present)
+ return -ENXIO;
+ return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
+ default:
+ return -ENODEV;
+ }
+}
+
+long 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;
+
+ 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: {
+ int err;
+ struct kvm_vcpu_init init;
+
+ err = kvm_vcpu_preferred_target(&init);
+ if (err)
+ return err;
+
+ if (copy_to_user(argp, &init, sizeof(init)))
+ return -EFAULT;
+
+ return 0;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static void cpu_init_hyp_mode(void *dummy)
+{
+ phys_addr_t pgd_ptr;
+ unsigned long hyp_stack_ptr;
+ unsigned long stack_page;
+ unsigned long vector_ptr;
+
+ /* Switch from the HYP stub to our own HYP init vector */
+ __hyp_set_vectors(kvm_get_idmap_vector());
+
+ pgd_ptr = kvm_mmu_get_httbr();
+ stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
+ hyp_stack_ptr = stack_page + PAGE_SIZE;
+ vector_ptr = (unsigned long)kvm_get_hyp_vector();
+
+ __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
+ __cpu_init_stage2();
+}
+
+static void cpu_hyp_reset(void)
+{
+ if (!is_kernel_in_hyp_mode())
+ __hyp_reset_vectors();
+}
+
+static void cpu_hyp_reinit(void)
+{
+ cpu_hyp_reset();
+
+ if (is_kernel_in_hyp_mode()) {
+ /*
+ * __cpu_init_stage2() is safe to call even if the PM
+ * event was cancelled before the CPU was reset.
+ */
+ __cpu_init_stage2();
+ kvm_timer_init_vhe();
+ } else {
+ cpu_init_hyp_mode(NULL);
+ }
+
+ kvm_arm_init_debug();
+
+ if (vgic_present)
+ kvm_vgic_init_cpu_hardware();
+}
+
+static void _kvm_arch_hardware_enable(void *discard)
+{
+ if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
+ cpu_hyp_reinit();
+ __this_cpu_write(kvm_arm_hardware_enabled, 1);
+ }
+}
+
+int kvm_arch_hardware_enable(void)
+{
+ _kvm_arch_hardware_enable(NULL);
+ return 0;
+}
+
+static void _kvm_arch_hardware_disable(void *discard)
+{
+ if (__this_cpu_read(kvm_arm_hardware_enabled)) {
+ cpu_hyp_reset();
+ __this_cpu_write(kvm_arm_hardware_enabled, 0);
+ }
+}
+
+void kvm_arch_hardware_disable(void)
+{
+ _kvm_arch_hardware_disable(NULL);
+}
+
+#ifdef CONFIG_CPU_PM
+static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
+ unsigned long cmd,
+ void *v)
+{
+ /*
+ * kvm_arm_hardware_enabled 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_arm_hardware_enabled))
+ /*
+ * don't update kvm_arm_hardware_enabled here
+ * so that the hardware 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_arm_hardware_enabled))
+ /* The hardware 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)
+{
+ cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
+}
+static void __init hyp_cpu_pm_exit(void)
+{
+ cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
+}
+#else
+static inline void hyp_cpu_pm_init(void)
+{
+}
+static inline void hyp_cpu_pm_exit(void)
+{
+}
+#endif
+
+static int init_common_resources(void)
+{
+ /* set size of VMID supported by CPU */
+ kvm_vmid_bits = kvm_get_vmid_bits();
+ kvm_info("%d-bit VMID\n", kvm_vmid_bits);
+
+ return 0;
+}
+
+static int init_subsystems(void)
+{
+ int err = 0;
+
+ /*
+ * Enable hardware so that subsystem initialisation can access EL2.
+ */
+ on_each_cpu(_kvm_arch_hardware_enable, 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_perf_init();
+ kvm_coproc_table_init();
+
+out:
+ on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
+
+ return err;
+}
+
+static void teardown_hyp_mode(void)
+{
+ int cpu;
+
+ free_hyp_pgds();
+ for_each_possible_cpu(cpu)
+ free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
+ hyp_cpu_pm_exit();
+}
+
+/**
+ * Inits Hyp-mode on all online CPUs
+ */
+static int init_hyp_mode(void)
+{
+ int cpu;
+ int err = 0;
+
+ /*
+ * Allocate Hyp PGD and setup Hyp identity mapping
+ */
+ err = kvm_mmu_init();
+ 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;
+ }
+
+ /*
+ * 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(__start_rodata),
+ kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
+ if (err) {
+ kvm_err("Cannot map rodata section\n");
+ goto out_err;
+ }
+
+ err = create_hyp_mappings(kvm_ksym_ref(__bss_start),
+ kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
+ if (err) {
+ kvm_err("Cannot map bss section\n");
+ goto out_err;
+ }
+
+ err = kvm_map_vectors();
+ if (err) {
+ kvm_err("Cannot map vectors\n");
+ goto out_err;
+ }
+
+ /*
+ * Map the Hyp stack pages
+ */
+ for_each_possible_cpu(cpu) {
+ char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
+ err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
+ PAGE_HYP);
+
+ if (err) {
+ kvm_err("Cannot map hyp stack\n");
+ goto out_err;
+ }
+ }
+
+ for_each_possible_cpu(cpu) {
+ kvm_cpu_context_t *cpu_ctxt;
+
+ cpu_ctxt = per_cpu_ptr(&kvm_host_cpu_state, cpu);
+ err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP);
+
+ if (err) {
+ kvm_err("Cannot map host CPU state: %d\n", err);
+ goto out_err;
+ }
+ }
+
+ err = hyp_map_aux_data();
+ if (err)
+ kvm_err("Cannot map host auxilary data: %d\n", err);
+
+ return 0;
+
+out_err:
+ teardown_hyp_mode();
+ kvm_err("error initializing Hyp mode: %d\n", err);
+ return err;
+}
+
+static void check_kvm_target_cpu(void *ret)
+{
+ *(int *)ret = kvm_target_cpu();
+}
+
+struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
+{
+ struct kvm_vcpu *vcpu;
+ int i;
+
+ mpidr &= MPIDR_HWID_BITMASK;
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
+ return vcpu;
+ }
+ return NULL;
+}
+
+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.
+ */
+int kvm_arch_init(void *opaque)
+{
+ int err;
+ int ret, cpu;
+ bool in_hyp_mode;
+
+ if (!is_hyp_mode_available()) {
+ kvm_info("HYP mode not available\n");
+ return -ENODEV;
+ }
+
+ if (!kvm_arch_check_sve_has_vhe()) {
+ kvm_pr_unimpl("SVE system without VHE unsupported. Broken cpu?");
+ return -ENODEV;
+ }
+
+ for_each_online_cpu(cpu) {
+ smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
+ if (ret < 0) {
+ kvm_err("Error, CPU %d not supported!\n", cpu);
+ return -ENODEV;
+ }
+ }
+
+ err = init_common_resources();
+ if (err)
+ return err;
+
+ in_hyp_mode = is_kernel_in_hyp_mode();
+
+ if (!in_hyp_mode) {
+ err = init_hyp_mode();
+ if (err)
+ goto out_err;
+ }
+
+ err = init_subsystems();
+ if (err)
+ goto out_hyp;
+
+ if (in_hyp_mode)
+ kvm_info("VHE mode initialized successfully\n");
+ else
+ kvm_info("Hyp mode initialized successfully\n");
+
+ return 0;
+
+out_hyp:
+ if (!in_hyp_mode)
+ teardown_hyp_mode();
+out_err:
+ return err;
+}
+
+/* NOP: Compiling as a module not supported */
+void kvm_arch_exit(void)
+{
+ kvm_perf_teardown();
+}
+
+static int arm_init(void)
+{
+ int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
+ return rc;
+}
+
+module_init(arm_init);