1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
4 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
8 #include <linux/cpu_pm.h>
9 #include <linux/errno.h>
10 #include <linux/err.h>
11 #include <linux/kvm_host.h>
12 #include <linux/list.h>
13 #include <linux/module.h>
14 #include <linux/vmalloc.h>
16 #include <linux/mman.h>
17 #include <linux/sched.h>
18 #include <linux/kvm.h>
19 #include <linux/kvm_irqfd.h>
20 #include <linux/irqbypass.h>
21 #include <linux/sched/stat.h>
22 #include <trace/events/kvm.h>
23 #include <kvm/arm_pmu.h>
24 #include <kvm/arm_psci.h>
26 #define CREATE_TRACE_POINTS
29 #include <linux/uaccess.h>
30 #include <asm/ptrace.h>
32 #include <asm/tlbflush.h>
33 #include <asm/cacheflush.h>
34 #include <asm/cpufeature.h>
36 #include <asm/kvm_arm.h>
37 #include <asm/kvm_asm.h>
38 #include <asm/kvm_mmu.h>
39 #include <asm/kvm_emulate.h>
40 #include <asm/kvm_coproc.h>
41 #include <asm/sections.h>
43 #include <kvm/arm_hypercalls.h>
44 #include <kvm/arm_pmu.h>
45 #include <kvm/arm_psci.h>
48 __asm__(".arch_extension virt");
51 DEFINE_PER_CPU(kvm_host_data_t, kvm_host_data);
52 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
54 /* Per-CPU variable containing the currently running vcpu. */
55 static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu);
57 /* The VMID used in the VTTBR */
58 static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
59 static u32 kvm_next_vmid;
60 static DEFINE_SPINLOCK(kvm_vmid_lock);
62 static bool vgic_present;
64 static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
66 static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu)
68 __this_cpu_write(kvm_arm_running_vcpu, vcpu);
71 DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
74 * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU.
75 * Must be called from non-preemptible context
77 struct kvm_vcpu *kvm_arm_get_running_vcpu(void)
79 return __this_cpu_read(kvm_arm_running_vcpu);
83 * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus.
85 struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void)
87 return &kvm_arm_running_vcpu;
90 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
92 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
95 int kvm_arch_hardware_setup(void)
100 int kvm_arch_check_processor_compat(void)
105 int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
106 struct kvm_enable_cap *cap)
114 case KVM_CAP_ARM_NISV_TO_USER:
116 kvm->arch.return_nisv_io_abort_to_user = true;
127 * kvm_arch_init_vm - initializes a VM data structure
128 * @kvm: pointer to the KVM struct
130 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
134 ret = kvm_arm_setup_stage2(kvm, type);
138 kvm->arch.last_vcpu_ran = alloc_percpu(typeof(*kvm->arch.last_vcpu_ran));
139 if (!kvm->arch.last_vcpu_ran)
142 for_each_possible_cpu(cpu)
143 *per_cpu_ptr(kvm->arch.last_vcpu_ran, cpu) = -1;
145 ret = kvm_alloc_stage2_pgd(kvm);
149 ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
151 goto out_free_stage2_pgd;
153 kvm_vgic_early_init(kvm);
155 /* Mark the initial VMID generation invalid */
156 kvm->arch.vmid.vmid_gen = 0;
158 /* The maximum number of VCPUs is limited by the host's GIC model */
159 kvm->arch.max_vcpus = vgic_present ?
160 kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
164 kvm_free_stage2_pgd(kvm);
166 free_percpu(kvm->arch.last_vcpu_ran);
167 kvm->arch.last_vcpu_ran = NULL;
171 int kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
176 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
178 return VM_FAULT_SIGBUS;
183 * kvm_arch_destroy_vm - destroy the VM data structure
184 * @kvm: pointer to the KVM struct
186 void kvm_arch_destroy_vm(struct kvm *kvm)
190 kvm_vgic_destroy(kvm);
192 free_percpu(kvm->arch.last_vcpu_ran);
193 kvm->arch.last_vcpu_ran = NULL;
195 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
197 kvm_arch_vcpu_free(kvm->vcpus[i]);
198 kvm->vcpus[i] = NULL;
201 atomic_set(&kvm->online_vcpus, 0);
204 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
208 case KVM_CAP_IRQCHIP:
211 case KVM_CAP_IOEVENTFD:
212 case KVM_CAP_DEVICE_CTRL:
213 case KVM_CAP_USER_MEMORY:
214 case KVM_CAP_SYNC_MMU:
215 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
216 case KVM_CAP_ONE_REG:
217 case KVM_CAP_ARM_PSCI:
218 case KVM_CAP_ARM_PSCI_0_2:
219 case KVM_CAP_READONLY_MEM:
220 case KVM_CAP_MP_STATE:
221 case KVM_CAP_IMMEDIATE_EXIT:
222 case KVM_CAP_VCPU_EVENTS:
223 case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
224 case KVM_CAP_ARM_NISV_TO_USER:
225 case KVM_CAP_ARM_INJECT_EXT_DABT:
228 case KVM_CAP_ARM_SET_DEVICE_ADDR:
231 case KVM_CAP_NR_VCPUS:
232 r = num_online_cpus();
234 case KVM_CAP_MAX_VCPUS:
237 case KVM_CAP_MAX_VCPU_ID:
240 case KVM_CAP_MSI_DEVID:
244 r = kvm->arch.vgic.msis_require_devid;
246 case KVM_CAP_ARM_USER_IRQ:
248 * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
249 * (bump this number if adding more devices)
254 r = kvm_arch_vm_ioctl_check_extension(kvm, ext);
260 long kvm_arch_dev_ioctl(struct file *filp,
261 unsigned int ioctl, unsigned long arg)
266 struct kvm *kvm_arch_alloc_vm(void)
269 return kzalloc(sizeof(struct kvm), GFP_KERNEL);
271 return vzalloc(sizeof(struct kvm));
274 void kvm_arch_free_vm(struct kvm *kvm)
282 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
285 struct kvm_vcpu *vcpu;
287 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) {
292 if (id >= kvm->arch.max_vcpus) {
297 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
303 err = kvm_vcpu_init(vcpu, kvm, id);
307 err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
313 kvm_vcpu_uninit(vcpu);
315 kmem_cache_free(kvm_vcpu_cache, vcpu);
320 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
324 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
326 if (vcpu->arch.has_run_once && unlikely(!irqchip_in_kernel(vcpu->kvm)))
327 static_branch_dec(&userspace_irqchip_in_use);
329 kvm_mmu_free_memory_caches(vcpu);
330 kvm_timer_vcpu_terminate(vcpu);
331 kvm_pmu_vcpu_destroy(vcpu);
332 kvm_vcpu_uninit(vcpu);
333 kmem_cache_free(kvm_vcpu_cache, vcpu);
336 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
338 kvm_arch_vcpu_free(vcpu);
341 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
343 return kvm_timer_is_pending(vcpu);
346 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
349 * If we're about to block (most likely because we've just hit a
350 * WFI), we need to sync back the state of the GIC CPU interface
351 * so that we have the lastest PMR and group enables. This ensures
352 * that kvm_arch_vcpu_runnable has up-to-date data to decide
353 * whether we have pending interrupts.
356 kvm_vgic_vmcr_sync(vcpu);
359 kvm_vgic_v4_enable_doorbell(vcpu);
362 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
364 kvm_vgic_v4_disable_doorbell(vcpu);
367 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
369 /* Force users to call KVM_ARM_VCPU_INIT */
370 vcpu->arch.target = -1;
371 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
373 /* Set up the timer */
374 kvm_timer_vcpu_init(vcpu);
376 kvm_pmu_vcpu_init(vcpu);
378 kvm_arm_reset_debug_ptr(vcpu);
380 kvm_arm_pvtime_vcpu_init(&vcpu->arch);
382 return kvm_vgic_vcpu_init(vcpu);
385 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
388 kvm_host_data_t *cpu_data;
390 last_ran = this_cpu_ptr(vcpu->kvm->arch.last_vcpu_ran);
391 cpu_data = this_cpu_ptr(&kvm_host_data);
394 * We might get preempted before the vCPU actually runs, but
395 * over-invalidation doesn't affect correctness.
397 if (*last_ran != vcpu->vcpu_id) {
398 kvm_call_hyp(__kvm_tlb_flush_local_vmid, vcpu);
399 *last_ran = vcpu->vcpu_id;
403 vcpu->arch.host_cpu_context = &cpu_data->host_ctxt;
405 kvm_arm_set_running_vcpu(vcpu);
407 kvm_timer_vcpu_load(vcpu);
408 kvm_vcpu_load_sysregs(vcpu);
409 kvm_arch_vcpu_load_fp(vcpu);
410 kvm_vcpu_pmu_restore_guest(vcpu);
411 if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
412 kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
414 if (single_task_running())
415 vcpu_clear_wfe_traps(vcpu);
417 vcpu_set_wfe_traps(vcpu);
419 vcpu_ptrauth_setup_lazy(vcpu);
422 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
424 kvm_arch_vcpu_put_fp(vcpu);
425 kvm_vcpu_put_sysregs(vcpu);
426 kvm_timer_vcpu_put(vcpu);
428 kvm_vcpu_pmu_restore_host(vcpu);
432 kvm_arm_set_running_vcpu(NULL);
435 static void vcpu_power_off(struct kvm_vcpu *vcpu)
437 vcpu->arch.power_off = true;
438 kvm_make_request(KVM_REQ_SLEEP, vcpu);
442 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
443 struct kvm_mp_state *mp_state)
445 if (vcpu->arch.power_off)
446 mp_state->mp_state = KVM_MP_STATE_STOPPED;
448 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
453 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
454 struct kvm_mp_state *mp_state)
458 switch (mp_state->mp_state) {
459 case KVM_MP_STATE_RUNNABLE:
460 vcpu->arch.power_off = false;
462 case KVM_MP_STATE_STOPPED:
463 vcpu_power_off(vcpu);
473 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
474 * @v: The VCPU pointer
476 * If the guest CPU is not waiting for interrupts or an interrupt line is
477 * asserted, the CPU is by definition runnable.
479 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
481 bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
482 return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
483 && !v->arch.power_off && !v->arch.pause);
486 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
488 return vcpu_mode_priv(vcpu);
491 /* Just ensure a guest exit from a particular CPU */
492 static void exit_vm_noop(void *info)
496 void force_vm_exit(const cpumask_t *mask)
499 smp_call_function_many(mask, exit_vm_noop, NULL, true);
504 * need_new_vmid_gen - check that the VMID is still valid
505 * @vmid: The VMID to check
507 * return true if there is a new generation of VMIDs being used
509 * The hardware supports a limited set of values with the value zero reserved
510 * for the host, so we check if an assigned value belongs to a previous
511 * generation, which which requires us to assign a new value. If we're the
512 * first to use a VMID for the new generation, we must flush necessary caches
513 * and TLBs on all CPUs.
515 static bool need_new_vmid_gen(struct kvm_vmid *vmid)
517 u64 current_vmid_gen = atomic64_read(&kvm_vmid_gen);
518 smp_rmb(); /* Orders read of kvm_vmid_gen and kvm->arch.vmid */
519 return unlikely(READ_ONCE(vmid->vmid_gen) != current_vmid_gen);
523 * update_vmid - Update the vmid with a valid VMID for the current generation
524 * @kvm: The guest that struct vmid belongs to
525 * @vmid: The stage-2 VMID information struct
527 static void update_vmid(struct kvm_vmid *vmid)
529 if (!need_new_vmid_gen(vmid))
532 spin_lock(&kvm_vmid_lock);
535 * We need to re-check the vmid_gen here to ensure that if another vcpu
536 * already allocated a valid vmid for this vm, then this vcpu should
539 if (!need_new_vmid_gen(vmid)) {
540 spin_unlock(&kvm_vmid_lock);
544 /* First user of a new VMID generation? */
545 if (unlikely(kvm_next_vmid == 0)) {
546 atomic64_inc(&kvm_vmid_gen);
550 * On SMP we know no other CPUs can use this CPU's or each
551 * other's VMID after force_vm_exit returns since the
552 * kvm_vmid_lock blocks them from reentry to the guest.
554 force_vm_exit(cpu_all_mask);
556 * Now broadcast TLB + ICACHE invalidation over the inner
557 * shareable domain to make sure all data structures are
560 kvm_call_hyp(__kvm_flush_vm_context);
563 vmid->vmid = kvm_next_vmid;
565 kvm_next_vmid &= (1 << kvm_get_vmid_bits()) - 1;
568 WRITE_ONCE(vmid->vmid_gen, atomic64_read(&kvm_vmid_gen));
570 spin_unlock(&kvm_vmid_lock);
573 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
575 struct kvm *kvm = vcpu->kvm;
578 if (likely(vcpu->arch.has_run_once))
581 if (!kvm_arm_vcpu_is_finalized(vcpu))
584 vcpu->arch.has_run_once = true;
586 if (likely(irqchip_in_kernel(kvm))) {
588 * Map the VGIC hardware resources before running a vcpu the
589 * first time on this VM.
591 if (unlikely(!vgic_ready(kvm))) {
592 ret = kvm_vgic_map_resources(kvm);
598 * Tell the rest of the code that there are userspace irqchip
601 static_branch_inc(&userspace_irqchip_in_use);
604 ret = kvm_timer_enable(vcpu);
608 ret = kvm_arm_pmu_v3_enable(vcpu);
613 bool kvm_arch_intc_initialized(struct kvm *kvm)
615 return vgic_initialized(kvm);
618 void kvm_arm_halt_guest(struct kvm *kvm)
621 struct kvm_vcpu *vcpu;
623 kvm_for_each_vcpu(i, vcpu, kvm)
624 vcpu->arch.pause = true;
625 kvm_make_all_cpus_request(kvm, KVM_REQ_SLEEP);
628 void kvm_arm_resume_guest(struct kvm *kvm)
631 struct kvm_vcpu *vcpu;
633 kvm_for_each_vcpu(i, vcpu, kvm) {
634 vcpu->arch.pause = false;
635 swake_up_one(kvm_arch_vcpu_wq(vcpu));
639 static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
641 struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu);
643 swait_event_interruptible_exclusive(*wq, ((!vcpu->arch.power_off) &&
644 (!vcpu->arch.pause)));
646 if (vcpu->arch.power_off || vcpu->arch.pause) {
647 /* Awaken to handle a signal, request we sleep again later. */
648 kvm_make_request(KVM_REQ_SLEEP, vcpu);
652 * Make sure we will observe a potential reset request if we've
653 * observed a change to the power state. Pairs with the smp_wmb() in
654 * kvm_psci_vcpu_on().
659 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
661 return vcpu->arch.target >= 0;
664 static void check_vcpu_requests(struct kvm_vcpu *vcpu)
666 if (kvm_request_pending(vcpu)) {
667 if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
668 vcpu_req_sleep(vcpu);
670 if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
671 kvm_reset_vcpu(vcpu);
674 * Clear IRQ_PENDING requests that were made to guarantee
675 * that a VCPU sees new virtual interrupts.
677 kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
679 if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu))
680 kvm_update_stolen_time(vcpu);
685 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
686 * @vcpu: The VCPU pointer
687 * @run: The kvm_run structure pointer used for userspace state exchange
689 * This function is called through the VCPU_RUN ioctl called from user space. It
690 * will execute VM code in a loop until the time slice for the process is used
691 * or some emulation is needed from user space in which case the function will
692 * return with return value 0 and with the kvm_run structure filled in with the
693 * required data for the requested emulation.
695 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
699 if (unlikely(!kvm_vcpu_initialized(vcpu)))
702 ret = kvm_vcpu_first_run_init(vcpu);
706 if (run->exit_reason == KVM_EXIT_MMIO) {
707 ret = kvm_handle_mmio_return(vcpu, vcpu->run);
712 if (run->immediate_exit)
717 kvm_sigset_activate(vcpu);
720 run->exit_reason = KVM_EXIT_UNKNOWN;
723 * Check conditions before entering the guest
727 update_vmid(&vcpu->kvm->arch.vmid);
729 check_vcpu_requests(vcpu);
732 * Preparing the interrupts to be injected also
733 * involves poking the GIC, which must be done in a
734 * non-preemptible context.
738 kvm_pmu_flush_hwstate(vcpu);
742 kvm_vgic_flush_hwstate(vcpu);
745 * Exit if we have a signal pending so that we can deliver the
746 * signal to user space.
748 if (signal_pending(current)) {
750 run->exit_reason = KVM_EXIT_INTR;
754 * If we're using a userspace irqchip, then check if we need
755 * to tell a userspace irqchip about timer or PMU level
756 * changes and if so, exit to userspace (the actual level
757 * state gets updated in kvm_timer_update_run and
758 * kvm_pmu_update_run below).
760 if (static_branch_unlikely(&userspace_irqchip_in_use)) {
761 if (kvm_timer_should_notify_user(vcpu) ||
762 kvm_pmu_should_notify_user(vcpu)) {
764 run->exit_reason = KVM_EXIT_INTR;
769 * Ensure we set mode to IN_GUEST_MODE after we disable
770 * interrupts and before the final VCPU requests check.
771 * See the comment in kvm_vcpu_exiting_guest_mode() and
772 * Documentation/virt/kvm/vcpu-requests.rst
774 smp_store_mb(vcpu->mode, IN_GUEST_MODE);
776 if (ret <= 0 || need_new_vmid_gen(&vcpu->kvm->arch.vmid) ||
777 kvm_request_pending(vcpu)) {
778 vcpu->mode = OUTSIDE_GUEST_MODE;
779 isb(); /* Ensure work in x_flush_hwstate is committed */
780 kvm_pmu_sync_hwstate(vcpu);
781 if (static_branch_unlikely(&userspace_irqchip_in_use))
782 kvm_timer_sync_hwstate(vcpu);
783 kvm_vgic_sync_hwstate(vcpu);
789 kvm_arm_setup_debug(vcpu);
791 /**************************************************************
794 trace_kvm_entry(*vcpu_pc(vcpu));
795 guest_enter_irqoff();
798 kvm_arm_vhe_guest_enter();
799 ret = kvm_vcpu_run_vhe(vcpu);
800 kvm_arm_vhe_guest_exit();
802 ret = kvm_call_hyp_ret(__kvm_vcpu_run_nvhe, vcpu);
805 vcpu->mode = OUTSIDE_GUEST_MODE;
809 *************************************************************/
811 kvm_arm_clear_debug(vcpu);
814 * We must sync the PMU state before the vgic state so
815 * that the vgic can properly sample the updated state of the
818 kvm_pmu_sync_hwstate(vcpu);
821 * Sync the vgic state before syncing the timer state because
822 * the timer code needs to know if the virtual timer
823 * interrupts are active.
825 kvm_vgic_sync_hwstate(vcpu);
828 * Sync the timer hardware state before enabling interrupts as
829 * we don't want vtimer interrupts to race with syncing the
830 * timer virtual interrupt state.
832 if (static_branch_unlikely(&userspace_irqchip_in_use))
833 kvm_timer_sync_hwstate(vcpu);
835 kvm_arch_vcpu_ctxsync_fp(vcpu);
838 * We may have taken a host interrupt in HYP mode (ie
839 * while executing the guest). This interrupt is still
840 * pending, as we haven't serviced it yet!
842 * We're now back in SVC mode, with interrupts
843 * disabled. Enabling the interrupts now will have
844 * the effect of taking the interrupt again, in SVC
850 * We do local_irq_enable() before calling guest_exit() so
851 * that if a timer interrupt hits while running the guest we
852 * account that tick as being spent in the guest. We enable
853 * preemption after calling guest_exit() so that if we get
854 * preempted we make sure ticks after that is not counted as
858 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
860 /* Exit types that need handling before we can be preempted */
861 handle_exit_early(vcpu, run, ret);
865 ret = handle_exit(vcpu, run, ret);
868 /* Tell userspace about in-kernel device output levels */
869 if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
870 kvm_timer_update_run(vcpu);
871 kvm_pmu_update_run(vcpu);
874 kvm_sigset_deactivate(vcpu);
880 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
886 if (number == KVM_ARM_IRQ_CPU_IRQ)
887 bit_index = __ffs(HCR_VI);
888 else /* KVM_ARM_IRQ_CPU_FIQ */
889 bit_index = __ffs(HCR_VF);
891 hcr = vcpu_hcr(vcpu);
893 set = test_and_set_bit(bit_index, hcr);
895 set = test_and_clear_bit(bit_index, hcr);
898 * If we didn't change anything, no need to wake up or kick other CPUs
904 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
905 * trigger a world-switch round on the running physical CPU to set the
906 * virtual IRQ/FIQ fields in the HCR appropriately.
908 kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
914 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
917 u32 irq = irq_level->irq;
918 unsigned int irq_type, vcpu_idx, irq_num;
919 int nrcpus = atomic_read(&kvm->online_vcpus);
920 struct kvm_vcpu *vcpu = NULL;
921 bool level = irq_level->level;
923 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
924 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
925 vcpu_idx += ((irq >> KVM_ARM_IRQ_VCPU2_SHIFT) & KVM_ARM_IRQ_VCPU2_MASK) * (KVM_ARM_IRQ_VCPU_MASK + 1);
926 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
928 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
931 case KVM_ARM_IRQ_TYPE_CPU:
932 if (irqchip_in_kernel(kvm))
935 if (vcpu_idx >= nrcpus)
938 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
942 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
945 return vcpu_interrupt_line(vcpu, irq_num, level);
946 case KVM_ARM_IRQ_TYPE_PPI:
947 if (!irqchip_in_kernel(kvm))
950 if (vcpu_idx >= nrcpus)
953 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
957 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
960 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level, NULL);
961 case KVM_ARM_IRQ_TYPE_SPI:
962 if (!irqchip_in_kernel(kvm))
965 if (irq_num < VGIC_NR_PRIVATE_IRQS)
968 return kvm_vgic_inject_irq(kvm, 0, irq_num, level, NULL);
974 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
975 const struct kvm_vcpu_init *init)
978 int phys_target = kvm_target_cpu();
980 if (init->target != phys_target)
984 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
985 * use the same target.
987 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
990 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
991 for (i = 0; i < sizeof(init->features) * 8; i++) {
992 bool set = (init->features[i / 32] & (1 << (i % 32)));
994 if (set && i >= KVM_VCPU_MAX_FEATURES)
998 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
999 * use the same feature set.
1001 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
1002 test_bit(i, vcpu->arch.features) != set)
1006 set_bit(i, vcpu->arch.features);
1009 vcpu->arch.target = phys_target;
1011 /* Now we know what it is, we can reset it. */
1012 ret = kvm_reset_vcpu(vcpu);
1014 vcpu->arch.target = -1;
1015 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
1021 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
1022 struct kvm_vcpu_init *init)
1026 ret = kvm_vcpu_set_target(vcpu, init);
1031 * Ensure a rebooted VM will fault in RAM pages and detect if the
1032 * guest MMU is turned off and flush the caches as needed.
1034 if (vcpu->arch.has_run_once)
1035 stage2_unmap_vm(vcpu->kvm);
1037 vcpu_reset_hcr(vcpu);
1040 * Handle the "start in power-off" case.
1042 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
1043 vcpu_power_off(vcpu);
1045 vcpu->arch.power_off = false;
1050 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
1051 struct kvm_device_attr *attr)
1055 switch (attr->group) {
1057 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
1064 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
1065 struct kvm_device_attr *attr)
1069 switch (attr->group) {
1071 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
1078 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
1079 struct kvm_device_attr *attr)
1083 switch (attr->group) {
1085 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
1092 static int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
1093 struct kvm_vcpu_events *events)
1095 memset(events, 0, sizeof(*events));
1097 return __kvm_arm_vcpu_get_events(vcpu, events);
1100 static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
1101 struct kvm_vcpu_events *events)
1105 /* check whether the reserved field is zero */
1106 for (i = 0; i < ARRAY_SIZE(events->reserved); i++)
1107 if (events->reserved[i])
1110 /* check whether the pad field is zero */
1111 for (i = 0; i < ARRAY_SIZE(events->exception.pad); i++)
1112 if (events->exception.pad[i])
1115 return __kvm_arm_vcpu_set_events(vcpu, events);
1118 long kvm_arch_vcpu_ioctl(struct file *filp,
1119 unsigned int ioctl, unsigned long arg)
1121 struct kvm_vcpu *vcpu = filp->private_data;
1122 void __user *argp = (void __user *)arg;
1123 struct kvm_device_attr attr;
1127 case KVM_ARM_VCPU_INIT: {
1128 struct kvm_vcpu_init init;
1131 if (copy_from_user(&init, argp, sizeof(init)))
1134 r = kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
1137 case KVM_SET_ONE_REG:
1138 case KVM_GET_ONE_REG: {
1139 struct kvm_one_reg reg;
1142 if (unlikely(!kvm_vcpu_initialized(vcpu)))
1146 if (copy_from_user(®, argp, sizeof(reg)))
1149 if (ioctl == KVM_SET_ONE_REG)
1150 r = kvm_arm_set_reg(vcpu, ®);
1152 r = kvm_arm_get_reg(vcpu, ®);
1155 case KVM_GET_REG_LIST: {
1156 struct kvm_reg_list __user *user_list = argp;
1157 struct kvm_reg_list reg_list;
1161 if (unlikely(!kvm_vcpu_initialized(vcpu)))
1165 if (!kvm_arm_vcpu_is_finalized(vcpu))
1169 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
1172 reg_list.n = kvm_arm_num_regs(vcpu);
1173 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
1178 r = kvm_arm_copy_reg_indices(vcpu, user_list->reg);
1181 case KVM_SET_DEVICE_ATTR: {
1183 if (copy_from_user(&attr, argp, sizeof(attr)))
1185 r = kvm_arm_vcpu_set_attr(vcpu, &attr);
1188 case KVM_GET_DEVICE_ATTR: {
1190 if (copy_from_user(&attr, argp, sizeof(attr)))
1192 r = kvm_arm_vcpu_get_attr(vcpu, &attr);
1195 case KVM_HAS_DEVICE_ATTR: {
1197 if (copy_from_user(&attr, argp, sizeof(attr)))
1199 r = kvm_arm_vcpu_has_attr(vcpu, &attr);
1202 case KVM_GET_VCPU_EVENTS: {
1203 struct kvm_vcpu_events events;
1205 if (kvm_arm_vcpu_get_events(vcpu, &events))
1208 if (copy_to_user(argp, &events, sizeof(events)))
1213 case KVM_SET_VCPU_EVENTS: {
1214 struct kvm_vcpu_events events;
1216 if (copy_from_user(&events, argp, sizeof(events)))
1219 return kvm_arm_vcpu_set_events(vcpu, &events);
1221 case KVM_ARM_VCPU_FINALIZE: {
1224 if (!kvm_vcpu_initialized(vcpu))
1227 if (get_user(what, (const int __user *)argp))
1230 return kvm_arm_vcpu_finalize(vcpu, what);
1240 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
1241 * @kvm: kvm instance
1242 * @log: slot id and address to which we copy the log
1244 * Steps 1-4 below provide general overview of dirty page logging. See
1245 * kvm_get_dirty_log_protect() function description for additional details.
1247 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
1248 * always flush the TLB (step 4) even if previous step failed and the dirty
1249 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
1250 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
1251 * writes will be marked dirty for next log read.
1253 * 1. Take a snapshot of the bit and clear it if needed.
1254 * 2. Write protect the corresponding page.
1255 * 3. Copy the snapshot to the userspace.
1256 * 4. Flush TLB's if needed.
1258 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
1263 mutex_lock(&kvm->slots_lock);
1265 r = kvm_get_dirty_log_protect(kvm, log, &flush);
1268 kvm_flush_remote_tlbs(kvm);
1270 mutex_unlock(&kvm->slots_lock);
1274 int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, struct kvm_clear_dirty_log *log)
1279 mutex_lock(&kvm->slots_lock);
1281 r = kvm_clear_dirty_log_protect(kvm, log, &flush);
1284 kvm_flush_remote_tlbs(kvm);
1286 mutex_unlock(&kvm->slots_lock);
1290 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
1291 struct kvm_arm_device_addr *dev_addr)
1293 unsigned long dev_id, type;
1295 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
1296 KVM_ARM_DEVICE_ID_SHIFT;
1297 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
1298 KVM_ARM_DEVICE_TYPE_SHIFT;
1301 case KVM_ARM_DEVICE_VGIC_V2:
1304 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1310 long kvm_arch_vm_ioctl(struct file *filp,
1311 unsigned int ioctl, unsigned long arg)
1313 struct kvm *kvm = filp->private_data;
1314 void __user *argp = (void __user *)arg;
1317 case KVM_CREATE_IRQCHIP: {
1321 mutex_lock(&kvm->lock);
1322 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1323 mutex_unlock(&kvm->lock);
1326 case KVM_ARM_SET_DEVICE_ADDR: {
1327 struct kvm_arm_device_addr dev_addr;
1329 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1331 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1333 case KVM_ARM_PREFERRED_TARGET: {
1335 struct kvm_vcpu_init init;
1337 err = kvm_vcpu_preferred_target(&init);
1341 if (copy_to_user(argp, &init, sizeof(init)))
1351 static void cpu_init_hyp_mode(void *dummy)
1353 phys_addr_t pgd_ptr;
1354 unsigned long hyp_stack_ptr;
1355 unsigned long stack_page;
1356 unsigned long vector_ptr;
1358 /* Switch from the HYP stub to our own HYP init vector */
1359 __hyp_set_vectors(kvm_get_idmap_vector());
1361 pgd_ptr = kvm_mmu_get_httbr();
1362 stack_page = __this_cpu_read(kvm_arm_hyp_stack_page);
1363 hyp_stack_ptr = stack_page + PAGE_SIZE;
1364 vector_ptr = (unsigned long)kvm_get_hyp_vector();
1366 __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr);
1367 __cpu_init_stage2();
1370 static void cpu_hyp_reset(void)
1372 if (!is_kernel_in_hyp_mode())
1373 __hyp_reset_vectors();
1376 static void cpu_hyp_reinit(void)
1378 kvm_init_host_cpu_context(&this_cpu_ptr(&kvm_host_data)->host_ctxt);
1382 if (is_kernel_in_hyp_mode())
1383 kvm_timer_init_vhe();
1385 cpu_init_hyp_mode(NULL);
1387 kvm_arm_init_debug();
1390 kvm_vgic_init_cpu_hardware();
1393 static void _kvm_arch_hardware_enable(void *discard)
1395 if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1397 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1401 int kvm_arch_hardware_enable(void)
1403 _kvm_arch_hardware_enable(NULL);
1407 static void _kvm_arch_hardware_disable(void *discard)
1409 if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1411 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1415 void kvm_arch_hardware_disable(void)
1417 _kvm_arch_hardware_disable(NULL);
1420 #ifdef CONFIG_CPU_PM
1421 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1426 * kvm_arm_hardware_enabled is left with its old value over
1427 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1432 if (__this_cpu_read(kvm_arm_hardware_enabled))
1434 * don't update kvm_arm_hardware_enabled here
1435 * so that the hardware will be re-enabled
1436 * when we resume. See below.
1441 case CPU_PM_ENTER_FAILED:
1443 if (__this_cpu_read(kvm_arm_hardware_enabled))
1444 /* The hardware was enabled before suspend. */
1454 static struct notifier_block hyp_init_cpu_pm_nb = {
1455 .notifier_call = hyp_init_cpu_pm_notifier,
1458 static void __init hyp_cpu_pm_init(void)
1460 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1462 static void __init hyp_cpu_pm_exit(void)
1464 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1467 static inline void hyp_cpu_pm_init(void)
1470 static inline void hyp_cpu_pm_exit(void)
1475 static int init_common_resources(void)
1477 kvm_set_ipa_limit();
1482 static int init_subsystems(void)
1487 * Enable hardware so that subsystem initialisation can access EL2.
1489 on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1492 * Register CPU lower-power notifier
1497 * Init HYP view of VGIC
1499 err = kvm_vgic_hyp_init();
1502 vgic_present = true;
1506 vgic_present = false;
1514 * Init HYP architected timer support
1516 err = kvm_timer_hyp_init(vgic_present);
1521 kvm_coproc_table_init();
1524 on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1529 static void teardown_hyp_mode(void)
1534 for_each_possible_cpu(cpu)
1535 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1540 * Inits Hyp-mode on all online CPUs
1542 static int init_hyp_mode(void)
1548 * Allocate Hyp PGD and setup Hyp identity mapping
1550 err = kvm_mmu_init();
1555 * Allocate stack pages for Hypervisor-mode
1557 for_each_possible_cpu(cpu) {
1558 unsigned long stack_page;
1560 stack_page = __get_free_page(GFP_KERNEL);
1566 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1570 * Map the Hyp-code called directly from the host
1572 err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1573 kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1575 kvm_err("Cannot map world-switch code\n");
1579 err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1580 kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1582 kvm_err("Cannot map rodata section\n");
1586 err = create_hyp_mappings(kvm_ksym_ref(__bss_start),
1587 kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
1589 kvm_err("Cannot map bss section\n");
1593 err = kvm_map_vectors();
1595 kvm_err("Cannot map vectors\n");
1600 * Map the Hyp stack pages
1602 for_each_possible_cpu(cpu) {
1603 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1604 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1608 kvm_err("Cannot map hyp stack\n");
1613 for_each_possible_cpu(cpu) {
1614 kvm_host_data_t *cpu_data;
1616 cpu_data = per_cpu_ptr(&kvm_host_data, cpu);
1617 err = create_hyp_mappings(cpu_data, cpu_data + 1, PAGE_HYP);
1620 kvm_err("Cannot map host CPU state: %d\n", err);
1625 err = hyp_map_aux_data();
1627 kvm_err("Cannot map host auxiliary data: %d\n", err);
1632 teardown_hyp_mode();
1633 kvm_err("error initializing Hyp mode: %d\n", err);
1637 static void check_kvm_target_cpu(void *ret)
1639 *(int *)ret = kvm_target_cpu();
1642 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1644 struct kvm_vcpu *vcpu;
1647 mpidr &= MPIDR_HWID_BITMASK;
1648 kvm_for_each_vcpu(i, vcpu, kvm) {
1649 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1655 bool kvm_arch_has_irq_bypass(void)
1660 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
1661 struct irq_bypass_producer *prod)
1663 struct kvm_kernel_irqfd *irqfd =
1664 container_of(cons, struct kvm_kernel_irqfd, consumer);
1666 return kvm_vgic_v4_set_forwarding(irqfd->kvm, prod->irq,
1669 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
1670 struct irq_bypass_producer *prod)
1672 struct kvm_kernel_irqfd *irqfd =
1673 container_of(cons, struct kvm_kernel_irqfd, consumer);
1675 kvm_vgic_v4_unset_forwarding(irqfd->kvm, prod->irq,
1679 void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
1681 struct kvm_kernel_irqfd *irqfd =
1682 container_of(cons, struct kvm_kernel_irqfd, consumer);
1684 kvm_arm_halt_guest(irqfd->kvm);
1687 void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
1689 struct kvm_kernel_irqfd *irqfd =
1690 container_of(cons, struct kvm_kernel_irqfd, consumer);
1692 kvm_arm_resume_guest(irqfd->kvm);
1696 * Initialize Hyp-mode and memory mappings on all CPUs.
1698 int kvm_arch_init(void *opaque)
1704 if (!is_hyp_mode_available()) {
1705 kvm_info("HYP mode not available\n");
1709 in_hyp_mode = is_kernel_in_hyp_mode();
1711 if (!in_hyp_mode && kvm_arch_requires_vhe()) {
1712 kvm_pr_unimpl("CPU unsupported in non-VHE mode, not initializing\n");
1716 for_each_online_cpu(cpu) {
1717 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
1719 kvm_err("Error, CPU %d not supported!\n", cpu);
1724 err = init_common_resources();
1728 err = kvm_arm_init_sve();
1733 err = init_hyp_mode();
1738 err = init_subsystems();
1743 kvm_info("VHE mode initialized successfully\n");
1745 kvm_info("Hyp mode initialized successfully\n");
1751 teardown_hyp_mode();
1756 /* NOP: Compiling as a module not supported */
1757 void kvm_arch_exit(void)
1759 kvm_perf_teardown();
1762 static int arm_init(void)
1764 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1768 module_init(arm_init);