diff options
Diffstat (limited to 'virt/kvm/arm/arm.c')
| -rw-r--r-- | virt/kvm/arm/arm.c | 1682 |
1 files changed, 0 insertions, 1682 deletions
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c deleted file mode 100644 index d5db0d6141ff..000000000000 --- a/virt/kvm/arm/arm.c +++ /dev/null @@ -1,1682 +0,0 @@ -// 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/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> - -#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> - -#include <kvm/arm_hypercalls.h> -#include <kvm/arm_pmu.h> -#include <kvm/arm_psci.h> - -#ifdef REQUIRES_VIRT -__asm__(".arch_extension virt"); -#endif - -DEFINE_PER_CPU(kvm_host_data_t, kvm_host_data); -static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); - -/* The VMID used in the VTTBR */ -static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); -static u32 kvm_next_vmid; -static DEFINE_SPINLOCK(kvm_vmid_lock); - -static bool vgic_present; - -static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled); -DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use); - -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 *opaque) -{ - return 0; -} - -int kvm_arch_check_processor_compat(void *opaque) -{ - return 0; -} - -int kvm_vm_ioctl_enable_cap(struct kvm *kvm, - struct kvm_enable_cap *cap) -{ - int r; - - if (cap->flags) - return -EINVAL; - - switch (cap->cap) { - case KVM_CAP_ARM_NISV_TO_USER: - r = 0; - kvm->arch.return_nisv_io_abort_to_user = true; - break; - default: - r = -EINVAL; - break; - } - - return r; -} - -/** - * 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; - - ret = kvm_arm_setup_stage2(kvm, type); - if (ret) - return ret; - - 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.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; -} - -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_vcpu_destroy(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: - 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: - 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_MAX_VCPU_ID: - r = KVM_MAX_VCPU_ID; - 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_vm_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); -} - -int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id) -{ - if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) - return -EBUSY; - - if (id >= kvm->arch.max_vcpus) - return -EINVAL; - - return 0; -} - -int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu) -{ - int err; - - /* 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_pmu_vcpu_init(vcpu); - - kvm_arm_reset_debug_ptr(vcpu); - - kvm_arm_pvtime_vcpu_init(&vcpu->arch); - - err = kvm_vgic_vcpu_init(vcpu); - if (err) - return err; - - return create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP); -} - -void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) -{ -} - -void kvm_arch_vcpu_destroy(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_arm_vcpu_destroy(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) -{ - /* - * If we're about to block (most likely because we've just hit a - * WFI), we need to 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. - * - * 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); - vgic_v4_put(vcpu, true); - preempt_enable(); -} - -void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) -{ - preempt_disable(); - vgic_v4_load(vcpu); - preempt_enable(); -} - -void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) -{ - int *last_ran; - kvm_host_data_t *cpu_data; - - last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran); - cpu_data = this_cpu_ptr(&kvm_host_data); - - /* - * 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 = &cpu_data->host_ctxt; - - kvm_vgic_load(vcpu); - kvm_timer_vcpu_load(vcpu); - kvm_vcpu_load_sysregs(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); - - vcpu_ptrauth_setup_lazy(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); - kvm_vcpu_pmu_restore_host(vcpu); - - vcpu->cpu = -1; -} - -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 - * @vmid: The VMID to check - * - * return true if there is a new generation of VMIDs being used - * - * The hardware supports a limited set of 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_vmid *vmid) -{ - u64 current_vmid_gen = atomic64_read(&kvm_vmid_gen); - smp_rmb(); /* Orders read of kvm_vmid_gen and kvm->arch.vmid */ - return unlikely(READ_ONCE(vmid->vmid_gen) != current_vmid_gen); -} - -/** - * update_vmid - Update the vmid with a valid VMID for the current generation - * @kvm: The guest that struct vmid belongs to - * @vmid: The stage-2 VMID information struct - */ -static void update_vmid(struct kvm_vmid *vmid) -{ - if (!need_new_vmid_gen(vmid)) - return; - - spin_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(vmid)) { - spin_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); - } - - vmid->vmid = kvm_next_vmid; - kvm_next_vmid++; - kvm_next_vmid &= (1 << kvm_get_vmid_bits()) - 1; - - smp_wmb(); - WRITE_ONCE(vmid->vmid_gen, atomic64_read(&kvm_vmid_gen)); - - spin_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; - - if (!kvm_arm_vcpu_is_finalized(vcpu)) - return -EPERM; - - 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; - rcuwait_wake_up(kvm_arch_vcpu_get_wait(vcpu)); - } -} - -static void vcpu_req_sleep(struct kvm_vcpu *vcpu) -{ - struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu); - - rcuwait_wait_event(wait, - (!vcpu->arch.power_off) &&(!vcpu->arch.pause), - TASK_INTERRUPTIBLE); - - 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); - } - - /* - * 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(); -} - -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); - - 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, false); - vgic_v4_load(vcpu); - preempt_enable(); - } - } -} - -/** - * 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 (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, run); - if (ret) - return ret; - } - - 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_vmid(&vcpu->kvm->arch.vmid); - - 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/virt/kvm/vcpu-requests.rst - */ - smp_store_mb(vcpu->mode, IN_GUEST_MODE); - - if (ret <= 0 || need_new_vmid_gen(&vcpu->kvm->arch.vmid) || - 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()) { - ret = kvm_vcpu_run_vhe(vcpu); - } else { - ret = kvm_call_hyp_ret(__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; - vcpu_idx += ((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_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, ret; - 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. */ - ret = kvm_reset_vcpu(vcpu); - if (ret) { - vcpu->arch.target = -1; - bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); - } - - return ret; -} - -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 = -EPERM; - if (!kvm_arm_vcpu_is_finalized(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); - } - 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) -{ - -} - -void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm, - struct kvm_memory_slot *memslot) -{ - kvm_flush_remote_tlbs(kvm); -} - -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) -{ - 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) -{ - kvm_init_host_cpu_context(&this_cpu_ptr(&kvm_host_data)->host_ctxt); - - cpu_hyp_reset(); - - if (is_kernel_in_hyp_mode()) - kvm_timer_init_vhe(); - else - cpu_init_hyp_mode(); - - 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) -{ - kvm_set_ipa_limit(); - - 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)); -} - -/** - * 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_host_data_t *cpu_data; - - cpu_data = per_cpu_ptr(&kvm_host_data, cpu); - err = create_hyp_mappings(cpu_data, cpu_data + 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 auxiliary 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; - } - - in_hyp_mode = is_kernel_in_hyp_mode(); - - if (!in_hyp_mode && kvm_arch_requires_vhe()) { - kvm_pr_unimpl("CPU unsupported in non-VHE mode, not initializing\n"); - 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; - - err = kvm_arm_init_sve(); - if (err) - return err; - - 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: - hyp_cpu_pm_exit(); - 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); |