/* * Copyright (C) 2012 - Virtual Open Systems and Columbia University * Author: Christoffer Dall * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #define CREATE_TRACE_POINTS #include "trace.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef REQUIRES_VIRT __asm__(".arch_extension virt"); #endif static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); static kvm_cpu_context_t __percpu *kvm_host_cpu_state; /* 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_SPINLOCK(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) { BUG_ON(preemptible()); __this_cpu_write(kvm_arm_running_vcpu, vcpu); } /** * 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) { BUG_ON(preemptible()); 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; } int 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; 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; } } kvm_vgic_destroy(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_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_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) { kvm_vgic_vcpu_early_init(vcpu); } void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) { kvm_mmu_free_memory_caches(vcpu); kvm_timer_vcpu_terminate(vcpu); kvm_vgic_vcpu_destroy(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_should_fire(vcpu_vtimer(vcpu)) || kvm_timer_should_fire(vcpu_ptimer(vcpu)); } void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) { kvm_timer_schedule(vcpu); } void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) { kvm_timer_unschedule(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); } void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { kvm_vgic_put(vcpu); vcpu->cpu = -1; kvm_arm_set_running_vcpu(NULL); kvm_timer_vcpu_put(vcpu); } static void vcpu_power_off(struct kvm_vcpu *vcpu) { vcpu->arch.power_off = true; kvm_make_request(KVM_REQ_VCPU_EXIT, 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) { 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: return -EINVAL; } return 0; } /** * 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) { return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v)) && !v->arch.power_off && !v->arch.pause); } /* 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; if (!need_new_vmid_gen(kvm)) 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(kvm)) { 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); } 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 = pgd_phys | vmid; 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; vcpu->arch.has_run_once = true; /* * Map the VGIC hardware resources before running a vcpu the first * time on this VM. */ if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) { ret = kvm_vgic_map_resources(kvm); if (ret) return ret; } ret = kvm_timer_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_VCPU_EXIT); } 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(kvm_arch_vcpu_wq(vcpu)); } } static void vcpu_sleep(struct kvm_vcpu *vcpu) { struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu); swait_event_interruptible(*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_VCPU_EXIT, 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_VCPU_EXIT, vcpu)) vcpu_sleep(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; sigset_t sigsaved; 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 (run->immediate_exit) return -EINTR; if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); 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); kvm_timer_flush_hwstate(vcpu); kvm_vgic_flush_hwstate(vcpu); local_irq_disable(); /* * If we have a singal pending, or need to notify a userspace * irqchip about timer or PMU level changes, then we exit (and * update the timer level state in kvm_timer_update_run * below). */ if (signal_pending(current) || 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; local_irq_enable(); kvm_pmu_sync_hwstate(vcpu); kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); preempt_enable(); continue; } kvm_arm_setup_debug(vcpu); /************************************************************** * Enter the guest */ trace_kvm_entry(*vcpu_pc(vcpu)); guest_enter_irqoff(); ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); vcpu->mode = OUTSIDE_GUEST_MODE; vcpu->stat.exits++; /* * Back from guest *************************************************************/ kvm_arm_clear_debug(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)); /* * We must sync the PMU and timer state before the vgic state so * that the vgic can properly sample the updated state of the * interrupt line. */ kvm_pmu_sync_hwstate(vcpu); kvm_timer_sync_hwstate(vcpu); kvm_vgic_sync_hwstate(vcpu); 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); } if (vcpu->sigset_active) sigprocmask(SIG_SETMASK, &sigsaved, NULL); return ret; } static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) { int bit_index; bool set; unsigned long *ptr; if (number == KVM_ARM_IRQ_CPU_IRQ) bit_index = __ffs(HCR_VI); else /* KVM_ARM_IRQ_CPU_FIQ */ bit_index = __ffs(HCR_VF); ptr = (unsigned long *)&vcpu->arch.irq_lines; if (level) set = test_and_set_bit(bit_index, ptr); else set = test_and_clear_bit(bit_index, ptr); /* * 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_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); 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); } 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; } 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; switch (ioctl) { case KVM_ARM_VCPU_INIT: { struct kvm_vcpu_init init; if (copy_from_user(&init, argp, sizeof(init))) return -EFAULT; return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); } case KVM_SET_ONE_REG: case KVM_GET_ONE_REG: { struct kvm_one_reg reg; if (unlikely(!kvm_vcpu_initialized(vcpu))) return -ENOEXEC; if (copy_from_user(®, argp, sizeof(reg))) return -EFAULT; if (ioctl == KVM_SET_ONE_REG) return kvm_arm_set_reg(vcpu, ®); else return kvm_arm_get_reg(vcpu, ®); } case KVM_GET_REG_LIST: { struct kvm_reg_list __user *user_list = argp; struct kvm_reg_list reg_list; unsigned n; if (unlikely(!kvm_vcpu_initialized(vcpu))) return -ENOEXEC; if (copy_from_user(®_list, user_list, sizeof(reg_list))) return -EFAULT; n = reg_list.n; reg_list.n = kvm_arm_num_regs(vcpu); if (copy_to_user(user_list, ®_list, sizeof(reg_list))) return -EFAULT; if (n < reg_list.n) return -E2BIG; return kvm_arm_copy_reg_indices(vcpu, user_list->reg); } case KVM_SET_DEVICE_ATTR: { if (copy_from_user(&attr, argp, sizeof(attr))) return -EFAULT; return kvm_arm_vcpu_set_attr(vcpu, &attr); } case KVM_GET_DEVICE_ATTR: { if (copy_from_user(&attr, argp, sizeof(attr))) return -EFAULT; return kvm_arm_vcpu_get_attr(vcpu, &attr); } case KVM_HAS_DEVICE_ATTR: { if (copy_from_user(&attr, argp, sizeof(attr))) return -EFAULT; return kvm_arm_vcpu_has_attr(vcpu, &attr); } default: return -EINVAL; } } /** * 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_ksym_ref(__kvm_hyp_vector); __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr); __cpu_init_stage2(); if (is_kernel_in_hyp_mode()) kvm_timer_init_vhe(); kvm_arm_init_debug(); } 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(); } else { cpu_init_hyp_mode(NULL); } 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_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 void teardown_common_resources(void) { free_percpu(kvm_host_cpu_state); } static int init_common_resources(void) { kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t); if (!kvm_host_cpu_state) { kvm_err("Cannot allocate host CPU state\n"); return -ENOMEM; } /* 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(); 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; if (is_kernel_in_hyp_mode()) return; free_hyp_pgds(); for_each_possible_cpu(cpu) free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); hyp_cpu_pm_exit(); } static int init_vhe_mode(void) { kvm_info("VHE mode initialized successfully\n"); return 0; } /** * 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; } /* * 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; } } kvm_info("Hyp mode initialized successfully\n"); 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; } /** * Initialize Hyp-mode and memory mappings on all CPUs. */ int kvm_arch_init(void *opaque) { int err; int ret, cpu; if (!is_hyp_mode_available()) { kvm_err("HYP mode not available\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; if (is_kernel_in_hyp_mode()) err = init_vhe_mode(); else err = init_hyp_mode(); if (err) goto out_err; err = init_subsystems(); if (err) goto out_hyp; return 0; out_hyp: teardown_hyp_mode(); out_err: teardown_common_resources(); 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);