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/entry-kvm.h>
10 #include <linux/errno.h>
11 #include <linux/err.h>
12 #include <linux/kvm_host.h>
13 #include <linux/list.h>
14 #include <linux/module.h>
15 #include <linux/vmalloc.h>
17 #include <linux/mman.h>
18 #include <linux/sched.h>
19 #include <linux/kvm.h>
20 #include <linux/kvm_irqfd.h>
21 #include <linux/irqbypass.h>
22 #include <linux/sched/stat.h>
23 #include <linux/psci.h>
24 #include <trace/events/kvm.h>
26 #define CREATE_TRACE_POINTS
27 #include "trace_arm.h"
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_nested.h>
40 #include <asm/kvm_pkvm.h>
41 #include <asm/kvm_emulate.h>
42 #include <asm/sections.h>
44 #include <kvm/arm_hypercalls.h>
45 #include <kvm/arm_pmu.h>
46 #include <kvm/arm_psci.h>
48 static enum kvm_mode kvm_mode = KVM_MODE_DEFAULT;
50 DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector);
52 DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
53 DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
55 DECLARE_KVM_NVHE_PER_CPU(struct kvm_cpu_context, kvm_hyp_ctxt);
57 static bool vgic_present, kvm_arm_initialised;
59 static DEFINE_PER_CPU(unsigned char, kvm_hyp_initialized);
60 DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
62 bool is_kvm_arm_initialised(void)
64 return kvm_arm_initialised;
67 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
69 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
72 int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
73 struct kvm_enable_cap *cap)
82 case KVM_CAP_ARM_NISV_TO_USER:
84 set_bit(KVM_ARCH_FLAG_RETURN_NISV_IO_ABORT_TO_USER,
88 mutex_lock(&kvm->lock);
89 if (!system_supports_mte() || kvm->created_vcpus) {
93 set_bit(KVM_ARCH_FLAG_MTE_ENABLED, &kvm->arch.flags);
95 mutex_unlock(&kvm->lock);
97 case KVM_CAP_ARM_SYSTEM_SUSPEND:
99 set_bit(KVM_ARCH_FLAG_SYSTEM_SUSPEND_ENABLED, &kvm->arch.flags);
101 case KVM_CAP_ARM_EAGER_SPLIT_CHUNK_SIZE:
102 new_cap = cap->args[0];
104 mutex_lock(&kvm->slots_lock);
106 * To keep things simple, allow changing the chunk
107 * size only when no memory slots have been created.
109 if (!kvm_are_all_memslots_empty(kvm)) {
111 } else if (new_cap && !kvm_is_block_size_supported(new_cap)) {
115 kvm->arch.mmu.split_page_chunk_size = new_cap;
117 mutex_unlock(&kvm->slots_lock);
127 static int kvm_arm_default_max_vcpus(void)
129 return vgic_present ? kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
133 * kvm_arch_init_vm - initializes a VM data structure
134 * @kvm: pointer to the KVM struct
136 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
140 mutex_init(&kvm->arch.config_lock);
142 #ifdef CONFIG_LOCKDEP
143 /* Clue in lockdep that the config_lock must be taken inside kvm->lock */
144 mutex_lock(&kvm->lock);
145 mutex_lock(&kvm->arch.config_lock);
146 mutex_unlock(&kvm->arch.config_lock);
147 mutex_unlock(&kvm->lock);
150 ret = kvm_share_hyp(kvm, kvm + 1);
154 ret = pkvm_init_host_vm(kvm);
156 goto err_unshare_kvm;
158 if (!zalloc_cpumask_var(&kvm->arch.supported_cpus, GFP_KERNEL_ACCOUNT)) {
160 goto err_unshare_kvm;
162 cpumask_copy(kvm->arch.supported_cpus, cpu_possible_mask);
164 ret = kvm_init_stage2_mmu(kvm, &kvm->arch.mmu, type);
166 goto err_free_cpumask;
168 kvm_vgic_early_init(kvm);
170 kvm_timer_init_vm(kvm);
172 /* The maximum number of VCPUs is limited by the host's GIC model */
173 kvm->max_vcpus = kvm_arm_default_max_vcpus();
175 kvm_arm_init_hypercalls(kvm);
177 bitmap_zero(kvm->arch.vcpu_features, KVM_VCPU_MAX_FEATURES);
182 free_cpumask_var(kvm->arch.supported_cpus);
184 kvm_unshare_hyp(kvm, kvm + 1);
188 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
190 return VM_FAULT_SIGBUS;
195 * kvm_arch_destroy_vm - destroy the VM data structure
196 * @kvm: pointer to the KVM struct
198 void kvm_arch_destroy_vm(struct kvm *kvm)
200 bitmap_free(kvm->arch.pmu_filter);
201 free_cpumask_var(kvm->arch.supported_cpus);
203 kvm_vgic_destroy(kvm);
205 if (is_protected_kvm_enabled())
206 pkvm_destroy_hyp_vm(kvm);
208 kvm_destroy_vcpus(kvm);
210 kvm_unshare_hyp(kvm, kvm + 1);
212 kvm_arm_teardown_hypercalls(kvm);
215 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
219 case KVM_CAP_IRQCHIP:
222 case KVM_CAP_IOEVENTFD:
223 case KVM_CAP_DEVICE_CTRL:
224 case KVM_CAP_USER_MEMORY:
225 case KVM_CAP_SYNC_MMU:
226 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
227 case KVM_CAP_ONE_REG:
228 case KVM_CAP_ARM_PSCI:
229 case KVM_CAP_ARM_PSCI_0_2:
230 case KVM_CAP_READONLY_MEM:
231 case KVM_CAP_MP_STATE:
232 case KVM_CAP_IMMEDIATE_EXIT:
233 case KVM_CAP_VCPU_EVENTS:
234 case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
235 case KVM_CAP_ARM_NISV_TO_USER:
236 case KVM_CAP_ARM_INJECT_EXT_DABT:
237 case KVM_CAP_SET_GUEST_DEBUG:
238 case KVM_CAP_VCPU_ATTRIBUTES:
239 case KVM_CAP_PTP_KVM:
240 case KVM_CAP_ARM_SYSTEM_SUSPEND:
241 case KVM_CAP_IRQFD_RESAMPLE:
242 case KVM_CAP_COUNTER_OFFSET:
245 case KVM_CAP_SET_GUEST_DEBUG2:
246 return KVM_GUESTDBG_VALID_MASK;
247 case KVM_CAP_ARM_SET_DEVICE_ADDR:
250 case KVM_CAP_NR_VCPUS:
252 * ARM64 treats KVM_CAP_NR_CPUS differently from all other
253 * architectures, as it does not always bound it to
254 * KVM_CAP_MAX_VCPUS. It should not matter much because
255 * this is just an advisory value.
257 r = min_t(unsigned int, num_online_cpus(),
258 kvm_arm_default_max_vcpus());
260 case KVM_CAP_MAX_VCPUS:
261 case KVM_CAP_MAX_VCPU_ID:
265 r = kvm_arm_default_max_vcpus();
267 case KVM_CAP_MSI_DEVID:
271 r = kvm->arch.vgic.msis_require_devid;
273 case KVM_CAP_ARM_USER_IRQ:
275 * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
276 * (bump this number if adding more devices)
280 case KVM_CAP_ARM_MTE:
281 r = system_supports_mte();
283 case KVM_CAP_STEAL_TIME:
284 r = kvm_arm_pvtime_supported();
286 case KVM_CAP_ARM_EL1_32BIT:
287 r = cpus_have_final_cap(ARM64_HAS_32BIT_EL1);
289 case KVM_CAP_GUEST_DEBUG_HW_BPS:
292 case KVM_CAP_GUEST_DEBUG_HW_WPS:
295 case KVM_CAP_ARM_PMU_V3:
296 r = kvm_arm_support_pmu_v3();
298 case KVM_CAP_ARM_INJECT_SERROR_ESR:
299 r = cpus_have_final_cap(ARM64_HAS_RAS_EXTN);
301 case KVM_CAP_ARM_VM_IPA_SIZE:
302 r = get_kvm_ipa_limit();
304 case KVM_CAP_ARM_SVE:
305 r = system_supports_sve();
307 case KVM_CAP_ARM_PTRAUTH_ADDRESS:
308 case KVM_CAP_ARM_PTRAUTH_GENERIC:
309 r = system_has_full_ptr_auth();
311 case KVM_CAP_ARM_EAGER_SPLIT_CHUNK_SIZE:
313 r = kvm->arch.mmu.split_page_chunk_size;
315 r = KVM_ARM_EAGER_SPLIT_CHUNK_SIZE_DEFAULT;
317 case KVM_CAP_ARM_SUPPORTED_BLOCK_SIZES:
318 r = kvm_supported_block_sizes();
327 long kvm_arch_dev_ioctl(struct file *filp,
328 unsigned int ioctl, unsigned long arg)
333 struct kvm *kvm_arch_alloc_vm(void)
335 size_t sz = sizeof(struct kvm);
338 return kzalloc(sz, GFP_KERNEL_ACCOUNT);
340 return __vmalloc(sz, GFP_KERNEL_ACCOUNT | __GFP_HIGHMEM | __GFP_ZERO);
343 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
345 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
348 if (id >= kvm->max_vcpus)
354 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
358 spin_lock_init(&vcpu->arch.mp_state_lock);
360 #ifdef CONFIG_LOCKDEP
361 /* Inform lockdep that the config_lock is acquired after vcpu->mutex */
362 mutex_lock(&vcpu->mutex);
363 mutex_lock(&vcpu->kvm->arch.config_lock);
364 mutex_unlock(&vcpu->kvm->arch.config_lock);
365 mutex_unlock(&vcpu->mutex);
368 /* Force users to call KVM_ARM_VCPU_INIT */
369 vcpu_clear_flag(vcpu, VCPU_INITIALIZED);
370 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
372 vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
375 * Default value for the FP state, will be overloaded at load
376 * time if we support FP (pretty likely)
378 vcpu->arch.fp_state = FP_STATE_FREE;
380 /* Set up the timer */
381 kvm_timer_vcpu_init(vcpu);
383 kvm_pmu_vcpu_init(vcpu);
385 kvm_arm_reset_debug_ptr(vcpu);
387 kvm_arm_pvtime_vcpu_init(&vcpu->arch);
389 vcpu->arch.hw_mmu = &vcpu->kvm->arch.mmu;
391 err = kvm_vgic_vcpu_init(vcpu);
395 return kvm_share_hyp(vcpu, vcpu + 1);
398 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
402 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
404 if (vcpu_has_run_once(vcpu) && unlikely(!irqchip_in_kernel(vcpu->kvm)))
405 static_branch_dec(&userspace_irqchip_in_use);
407 kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
408 kvm_timer_vcpu_terminate(vcpu);
409 kvm_pmu_vcpu_destroy(vcpu);
411 kvm_arm_vcpu_destroy(vcpu);
414 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
419 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
424 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
426 struct kvm_s2_mmu *mmu;
429 mmu = vcpu->arch.hw_mmu;
430 last_ran = this_cpu_ptr(mmu->last_vcpu_ran);
433 * We guarantee that both TLBs and I-cache are private to each
434 * vcpu. If detecting that a vcpu from the same VM has
435 * previously run on the same physical CPU, call into the
436 * hypervisor code to nuke the relevant contexts.
438 * We might get preempted before the vCPU actually runs, but
439 * over-invalidation doesn't affect correctness.
441 if (*last_ran != vcpu->vcpu_id) {
442 kvm_call_hyp(__kvm_flush_cpu_context, mmu);
443 *last_ran = vcpu->vcpu_id;
449 kvm_timer_vcpu_load(vcpu);
451 kvm_vcpu_load_sysregs_vhe(vcpu);
452 kvm_arch_vcpu_load_fp(vcpu);
453 kvm_vcpu_pmu_restore_guest(vcpu);
454 if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
455 kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
457 if (single_task_running())
458 vcpu_clear_wfx_traps(vcpu);
460 vcpu_set_wfx_traps(vcpu);
462 if (vcpu_has_ptrauth(vcpu))
463 vcpu_ptrauth_disable(vcpu);
464 kvm_arch_vcpu_load_debug_state_flags(vcpu);
466 if (!cpumask_test_cpu(cpu, vcpu->kvm->arch.supported_cpus))
467 vcpu_set_on_unsupported_cpu(vcpu);
470 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
472 kvm_arch_vcpu_put_debug_state_flags(vcpu);
473 kvm_arch_vcpu_put_fp(vcpu);
475 kvm_vcpu_put_sysregs_vhe(vcpu);
476 kvm_timer_vcpu_put(vcpu);
478 kvm_vcpu_pmu_restore_host(vcpu);
479 kvm_arm_vmid_clear_active();
481 vcpu_clear_on_unsupported_cpu(vcpu);
485 static void __kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu)
487 WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_STOPPED);
488 kvm_make_request(KVM_REQ_SLEEP, vcpu);
492 void kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu)
494 spin_lock(&vcpu->arch.mp_state_lock);
495 __kvm_arm_vcpu_power_off(vcpu);
496 spin_unlock(&vcpu->arch.mp_state_lock);
499 bool kvm_arm_vcpu_stopped(struct kvm_vcpu *vcpu)
501 return READ_ONCE(vcpu->arch.mp_state.mp_state) == KVM_MP_STATE_STOPPED;
504 static void kvm_arm_vcpu_suspend(struct kvm_vcpu *vcpu)
506 WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_SUSPENDED);
507 kvm_make_request(KVM_REQ_SUSPEND, vcpu);
511 static bool kvm_arm_vcpu_suspended(struct kvm_vcpu *vcpu)
513 return READ_ONCE(vcpu->arch.mp_state.mp_state) == KVM_MP_STATE_SUSPENDED;
516 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
517 struct kvm_mp_state *mp_state)
519 *mp_state = READ_ONCE(vcpu->arch.mp_state);
524 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
525 struct kvm_mp_state *mp_state)
529 spin_lock(&vcpu->arch.mp_state_lock);
531 switch (mp_state->mp_state) {
532 case KVM_MP_STATE_RUNNABLE:
533 WRITE_ONCE(vcpu->arch.mp_state, *mp_state);
535 case KVM_MP_STATE_STOPPED:
536 __kvm_arm_vcpu_power_off(vcpu);
538 case KVM_MP_STATE_SUSPENDED:
539 kvm_arm_vcpu_suspend(vcpu);
545 spin_unlock(&vcpu->arch.mp_state_lock);
551 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
552 * @v: The VCPU pointer
554 * If the guest CPU is not waiting for interrupts or an interrupt line is
555 * asserted, the CPU is by definition runnable.
557 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
559 bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
560 return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
561 && !kvm_arm_vcpu_stopped(v) && !v->arch.pause);
564 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
566 return vcpu_mode_priv(vcpu);
569 #ifdef CONFIG_GUEST_PERF_EVENTS
570 unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)
572 return *vcpu_pc(vcpu);
576 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
578 return vcpu_get_flag(vcpu, VCPU_INITIALIZED);
582 * Handle both the initialisation that is being done when the vcpu is
583 * run for the first time, as well as the updates that must be
584 * performed each time we get a new thread dealing with this vcpu.
586 int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu)
588 struct kvm *kvm = vcpu->kvm;
591 if (!kvm_vcpu_initialized(vcpu))
594 if (!kvm_arm_vcpu_is_finalized(vcpu))
597 ret = kvm_arch_vcpu_run_map_fp(vcpu);
601 if (likely(vcpu_has_run_once(vcpu)))
604 kvm_arm_vcpu_init_debug(vcpu);
606 if (likely(irqchip_in_kernel(kvm))) {
608 * Map the VGIC hardware resources before running a vcpu the
609 * first time on this VM.
611 ret = kvm_vgic_map_resources(kvm);
616 ret = kvm_timer_enable(vcpu);
620 ret = kvm_arm_pmu_v3_enable(vcpu);
624 if (is_protected_kvm_enabled()) {
625 ret = pkvm_create_hyp_vm(kvm);
630 if (!irqchip_in_kernel(kvm)) {
632 * Tell the rest of the code that there are userspace irqchip
635 static_branch_inc(&userspace_irqchip_in_use);
639 * Initialize traps for protected VMs.
640 * NOTE: Move to run in EL2 directly, rather than via a hypercall, once
641 * the code is in place for first run initialization at EL2.
643 if (kvm_vm_is_protected(kvm))
644 kvm_call_hyp_nvhe(__pkvm_vcpu_init_traps, vcpu);
646 mutex_lock(&kvm->arch.config_lock);
647 set_bit(KVM_ARCH_FLAG_HAS_RAN_ONCE, &kvm->arch.flags);
648 mutex_unlock(&kvm->arch.config_lock);
653 bool kvm_arch_intc_initialized(struct kvm *kvm)
655 return vgic_initialized(kvm);
658 void kvm_arm_halt_guest(struct kvm *kvm)
661 struct kvm_vcpu *vcpu;
663 kvm_for_each_vcpu(i, vcpu, kvm)
664 vcpu->arch.pause = true;
665 kvm_make_all_cpus_request(kvm, KVM_REQ_SLEEP);
668 void kvm_arm_resume_guest(struct kvm *kvm)
671 struct kvm_vcpu *vcpu;
673 kvm_for_each_vcpu(i, vcpu, kvm) {
674 vcpu->arch.pause = false;
675 __kvm_vcpu_wake_up(vcpu);
679 static void kvm_vcpu_sleep(struct kvm_vcpu *vcpu)
681 struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
683 rcuwait_wait_event(wait,
684 (!kvm_arm_vcpu_stopped(vcpu)) && (!vcpu->arch.pause),
687 if (kvm_arm_vcpu_stopped(vcpu) || vcpu->arch.pause) {
688 /* Awaken to handle a signal, request we sleep again later. */
689 kvm_make_request(KVM_REQ_SLEEP, vcpu);
693 * Make sure we will observe a potential reset request if we've
694 * observed a change to the power state. Pairs with the smp_wmb() in
695 * kvm_psci_vcpu_on().
701 * kvm_vcpu_wfi - emulate Wait-For-Interrupt behavior
702 * @vcpu: The VCPU pointer
704 * Suspend execution of a vCPU until a valid wake event is detected, i.e. until
705 * the vCPU is runnable. The vCPU may or may not be scheduled out, depending
706 * on when a wake event arrives, e.g. there may already be a pending wake event.
708 void kvm_vcpu_wfi(struct kvm_vcpu *vcpu)
711 * Sync back the state of the GIC CPU interface so that we have
712 * the latest PMR and group enables. This ensures that
713 * kvm_arch_vcpu_runnable has up-to-date data to decide whether
714 * we have pending interrupts, e.g. when determining if the
717 * For the same reason, we want to tell GICv4 that we need
718 * doorbells to be signalled, should an interrupt become pending.
721 kvm_vgic_vmcr_sync(vcpu);
722 vcpu_set_flag(vcpu, IN_WFI);
727 vcpu_clear_flag(vcpu, IN_WFIT);
730 vcpu_clear_flag(vcpu, IN_WFI);
735 static int kvm_vcpu_suspend(struct kvm_vcpu *vcpu)
737 if (!kvm_arm_vcpu_suspended(vcpu))
743 * The suspend state is sticky; we do not leave it until userspace
744 * explicitly marks the vCPU as runnable. Request that we suspend again
747 kvm_make_request(KVM_REQ_SUSPEND, vcpu);
750 * Check to make sure the vCPU is actually runnable. If so, exit to
751 * userspace informing it of the wakeup condition.
753 if (kvm_arch_vcpu_runnable(vcpu)) {
754 memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event));
755 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_WAKEUP;
756 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
761 * Otherwise, we were unblocked to process a different event, such as a
762 * pending signal. Return 1 and allow kvm_arch_vcpu_ioctl_run() to
769 * check_vcpu_requests - check and handle pending vCPU requests
770 * @vcpu: the VCPU pointer
772 * Return: 1 if we should enter the guest
773 * 0 if we should exit to userspace
774 * < 0 if we should exit to userspace, where the return value indicates
777 static int check_vcpu_requests(struct kvm_vcpu *vcpu)
779 if (kvm_request_pending(vcpu)) {
780 if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
781 kvm_vcpu_sleep(vcpu);
783 if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
784 kvm_reset_vcpu(vcpu);
787 * Clear IRQ_PENDING requests that were made to guarantee
788 * that a VCPU sees new virtual interrupts.
790 kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
792 if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu))
793 kvm_update_stolen_time(vcpu);
795 if (kvm_check_request(KVM_REQ_RELOAD_GICv4, vcpu)) {
796 /* The distributor enable bits were changed */
803 if (kvm_check_request(KVM_REQ_RELOAD_PMU, vcpu))
804 kvm_pmu_handle_pmcr(vcpu,
805 __vcpu_sys_reg(vcpu, PMCR_EL0));
807 if (kvm_check_request(KVM_REQ_RESYNC_PMU_EL0, vcpu))
808 kvm_vcpu_pmu_restore_guest(vcpu);
810 if (kvm_check_request(KVM_REQ_SUSPEND, vcpu))
811 return kvm_vcpu_suspend(vcpu);
813 if (kvm_dirty_ring_check_request(vcpu))
820 static bool vcpu_mode_is_bad_32bit(struct kvm_vcpu *vcpu)
822 if (likely(!vcpu_mode_is_32bit(vcpu)))
825 if (vcpu_has_nv(vcpu))
828 return !kvm_supports_32bit_el0();
832 * kvm_vcpu_exit_request - returns true if the VCPU should *not* enter the guest
833 * @vcpu: The VCPU pointer
834 * @ret: Pointer to write optional return code
836 * Returns: true if the VCPU needs to return to a preemptible + interruptible
837 * and skip guest entry.
839 * This function disambiguates between two different types of exits: exits to a
840 * preemptible + interruptible kernel context and exits to userspace. For an
841 * exit to userspace, this function will write the return code to ret and return
842 * true. For an exit to preemptible + interruptible kernel context (i.e. check
843 * for pending work and re-enter), return true without writing to ret.
845 static bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu, int *ret)
847 struct kvm_run *run = vcpu->run;
850 * If we're using a userspace irqchip, then check if we need
851 * to tell a userspace irqchip about timer or PMU level
852 * changes and if so, exit to userspace (the actual level
853 * state gets updated in kvm_timer_update_run and
854 * kvm_pmu_update_run below).
856 if (static_branch_unlikely(&userspace_irqchip_in_use)) {
857 if (kvm_timer_should_notify_user(vcpu) ||
858 kvm_pmu_should_notify_user(vcpu)) {
860 run->exit_reason = KVM_EXIT_INTR;
865 if (unlikely(vcpu_on_unsupported_cpu(vcpu))) {
866 run->exit_reason = KVM_EXIT_FAIL_ENTRY;
867 run->fail_entry.hardware_entry_failure_reason = KVM_EXIT_FAIL_ENTRY_CPU_UNSUPPORTED;
868 run->fail_entry.cpu = smp_processor_id();
873 return kvm_request_pending(vcpu) ||
874 xfer_to_guest_mode_work_pending();
878 * Actually run the vCPU, entering an RCU extended quiescent state (EQS) while
879 * the vCPU is running.
881 * This must be noinstr as instrumentation may make use of RCU, and this is not
882 * safe during the EQS.
884 static int noinstr kvm_arm_vcpu_enter_exit(struct kvm_vcpu *vcpu)
888 guest_state_enter_irqoff();
889 ret = kvm_call_hyp_ret(__kvm_vcpu_run, vcpu);
890 guest_state_exit_irqoff();
896 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
897 * @vcpu: The VCPU pointer
899 * This function is called through the VCPU_RUN ioctl called from user space. It
900 * will execute VM code in a loop until the time slice for the process is used
901 * or some emulation is needed from user space in which case the function will
902 * return with return value 0 and with the kvm_run structure filled in with the
903 * required data for the requested emulation.
905 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
907 struct kvm_run *run = vcpu->run;
910 if (run->exit_reason == KVM_EXIT_MMIO) {
911 ret = kvm_handle_mmio_return(vcpu);
918 if (run->immediate_exit) {
923 kvm_sigset_activate(vcpu);
926 run->exit_reason = KVM_EXIT_UNKNOWN;
930 * Check conditions before entering the guest
932 ret = xfer_to_guest_mode_handle_work(vcpu);
937 ret = check_vcpu_requests(vcpu);
940 * Preparing the interrupts to be injected also
941 * involves poking the GIC, which must be done in a
942 * non-preemptible context.
947 * The VMID allocator only tracks active VMIDs per
948 * physical CPU, and therefore the VMID allocated may not be
949 * preserved on VMID roll-over if the task was preempted,
950 * making a thread's VMID inactive. So we need to call
951 * kvm_arm_vmid_update() in non-premptible context.
953 kvm_arm_vmid_update(&vcpu->arch.hw_mmu->vmid);
955 kvm_pmu_flush_hwstate(vcpu);
959 kvm_vgic_flush_hwstate(vcpu);
961 kvm_pmu_update_vcpu_events(vcpu);
964 * Ensure we set mode to IN_GUEST_MODE after we disable
965 * interrupts and before the final VCPU requests check.
966 * See the comment in kvm_vcpu_exiting_guest_mode() and
967 * Documentation/virt/kvm/vcpu-requests.rst
969 smp_store_mb(vcpu->mode, IN_GUEST_MODE);
971 if (ret <= 0 || kvm_vcpu_exit_request(vcpu, &ret)) {
972 vcpu->mode = OUTSIDE_GUEST_MODE;
973 isb(); /* Ensure work in x_flush_hwstate is committed */
974 kvm_pmu_sync_hwstate(vcpu);
975 if (static_branch_unlikely(&userspace_irqchip_in_use))
976 kvm_timer_sync_user(vcpu);
977 kvm_vgic_sync_hwstate(vcpu);
983 kvm_arm_setup_debug(vcpu);
984 kvm_arch_vcpu_ctxflush_fp(vcpu);
986 /**************************************************************
989 trace_kvm_entry(*vcpu_pc(vcpu));
990 guest_timing_enter_irqoff();
992 ret = kvm_arm_vcpu_enter_exit(vcpu);
994 vcpu->mode = OUTSIDE_GUEST_MODE;
998 *************************************************************/
1000 kvm_arm_clear_debug(vcpu);
1003 * We must sync the PMU state before the vgic state so
1004 * that the vgic can properly sample the updated state of the
1007 kvm_pmu_sync_hwstate(vcpu);
1010 * Sync the vgic state before syncing the timer state because
1011 * the timer code needs to know if the virtual timer
1012 * interrupts are active.
1014 kvm_vgic_sync_hwstate(vcpu);
1017 * Sync the timer hardware state before enabling interrupts as
1018 * we don't want vtimer interrupts to race with syncing the
1019 * timer virtual interrupt state.
1021 if (static_branch_unlikely(&userspace_irqchip_in_use))
1022 kvm_timer_sync_user(vcpu);
1024 kvm_arch_vcpu_ctxsync_fp(vcpu);
1027 * We must ensure that any pending interrupts are taken before
1028 * we exit guest timing so that timer ticks are accounted as
1029 * guest time. Transiently unmask interrupts so that any
1030 * pending interrupts are taken.
1032 * Per ARM DDI 0487G.b section D1.13.4, an ISB (or other
1033 * context synchronization event) is necessary to ensure that
1034 * pending interrupts are taken.
1036 if (ARM_EXCEPTION_CODE(ret) == ARM_EXCEPTION_IRQ) {
1039 local_irq_disable();
1042 guest_timing_exit_irqoff();
1046 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
1048 /* Exit types that need handling before we can be preempted */
1049 handle_exit_early(vcpu, ret);
1054 * The ARMv8 architecture doesn't give the hypervisor
1055 * a mechanism to prevent a guest from dropping to AArch32 EL0
1056 * if implemented by the CPU. If we spot the guest in such
1057 * state and that we decided it wasn't supposed to do so (like
1058 * with the asymmetric AArch32 case), return to userspace with
1061 if (vcpu_mode_is_bad_32bit(vcpu)) {
1063 * As we have caught the guest red-handed, decide that
1064 * it isn't fit for purpose anymore by making the vcpu
1065 * invalid. The VMM can try and fix it by issuing a
1066 * KVM_ARM_VCPU_INIT if it really wants to.
1068 vcpu_clear_flag(vcpu, VCPU_INITIALIZED);
1069 ret = ARM_EXCEPTION_IL;
1072 ret = handle_exit(vcpu, ret);
1075 /* Tell userspace about in-kernel device output levels */
1076 if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
1077 kvm_timer_update_run(vcpu);
1078 kvm_pmu_update_run(vcpu);
1081 kvm_sigset_deactivate(vcpu);
1085 * In the unlikely event that we are returning to userspace
1086 * with pending exceptions or PC adjustment, commit these
1087 * adjustments in order to give userspace a consistent view of
1088 * the vcpu state. Note that this relies on __kvm_adjust_pc()
1089 * being preempt-safe on VHE.
1091 if (unlikely(vcpu_get_flag(vcpu, PENDING_EXCEPTION) ||
1092 vcpu_get_flag(vcpu, INCREMENT_PC)))
1093 kvm_call_hyp(__kvm_adjust_pc, vcpu);
1099 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
1105 if (number == KVM_ARM_IRQ_CPU_IRQ)
1106 bit_index = __ffs(HCR_VI);
1107 else /* KVM_ARM_IRQ_CPU_FIQ */
1108 bit_index = __ffs(HCR_VF);
1110 hcr = vcpu_hcr(vcpu);
1112 set = test_and_set_bit(bit_index, hcr);
1114 set = test_and_clear_bit(bit_index, hcr);
1117 * If we didn't change anything, no need to wake up or kick other CPUs
1123 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
1124 * trigger a world-switch round on the running physical CPU to set the
1125 * virtual IRQ/FIQ fields in the HCR appropriately.
1127 kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
1128 kvm_vcpu_kick(vcpu);
1133 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
1136 u32 irq = irq_level->irq;
1137 unsigned int irq_type, vcpu_idx, irq_num;
1138 int nrcpus = atomic_read(&kvm->online_vcpus);
1139 struct kvm_vcpu *vcpu = NULL;
1140 bool level = irq_level->level;
1142 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
1143 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
1144 vcpu_idx += ((irq >> KVM_ARM_IRQ_VCPU2_SHIFT) & KVM_ARM_IRQ_VCPU2_MASK) * (KVM_ARM_IRQ_VCPU_MASK + 1);
1145 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
1147 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
1150 case KVM_ARM_IRQ_TYPE_CPU:
1151 if (irqchip_in_kernel(kvm))
1154 if (vcpu_idx >= nrcpus)
1157 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
1161 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
1164 return vcpu_interrupt_line(vcpu, irq_num, level);
1165 case KVM_ARM_IRQ_TYPE_PPI:
1166 if (!irqchip_in_kernel(kvm))
1169 if (vcpu_idx >= nrcpus)
1172 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
1176 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
1179 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level, NULL);
1180 case KVM_ARM_IRQ_TYPE_SPI:
1181 if (!irqchip_in_kernel(kvm))
1184 if (irq_num < VGIC_NR_PRIVATE_IRQS)
1187 return kvm_vgic_inject_irq(kvm, 0, irq_num, level, NULL);
1193 static int kvm_vcpu_init_check_features(struct kvm_vcpu *vcpu,
1194 const struct kvm_vcpu_init *init)
1196 unsigned long features = init->features[0];
1199 if (features & ~KVM_VCPU_VALID_FEATURES)
1202 for (i = 1; i < ARRAY_SIZE(init->features); i++) {
1203 if (init->features[i])
1207 if (!test_bit(KVM_ARM_VCPU_EL1_32BIT, &features))
1210 if (!cpus_have_final_cap(ARM64_HAS_32BIT_EL1))
1213 /* MTE is incompatible with AArch32 */
1214 if (kvm_has_mte(vcpu->kvm))
1217 /* NV is incompatible with AArch32 */
1218 if (test_bit(KVM_ARM_VCPU_HAS_EL2, &features))
1224 static bool kvm_vcpu_init_changed(struct kvm_vcpu *vcpu,
1225 const struct kvm_vcpu_init *init)
1227 unsigned long features = init->features[0];
1229 return !bitmap_equal(vcpu->arch.features, &features, KVM_VCPU_MAX_FEATURES);
1232 static int __kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
1233 const struct kvm_vcpu_init *init)
1235 unsigned long features = init->features[0];
1236 struct kvm *kvm = vcpu->kvm;
1239 mutex_lock(&kvm->arch.config_lock);
1241 if (test_bit(KVM_ARCH_FLAG_VCPU_FEATURES_CONFIGURED, &kvm->arch.flags) &&
1242 !bitmap_equal(kvm->arch.vcpu_features, &features, KVM_VCPU_MAX_FEATURES))
1245 bitmap_copy(vcpu->arch.features, &features, KVM_VCPU_MAX_FEATURES);
1247 /* Now we know what it is, we can reset it. */
1248 ret = kvm_reset_vcpu(vcpu);
1250 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
1254 bitmap_copy(kvm->arch.vcpu_features, &features, KVM_VCPU_MAX_FEATURES);
1255 set_bit(KVM_ARCH_FLAG_VCPU_FEATURES_CONFIGURED, &kvm->arch.flags);
1256 vcpu_set_flag(vcpu, VCPU_INITIALIZED);
1258 mutex_unlock(&kvm->arch.config_lock);
1262 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
1263 const struct kvm_vcpu_init *init)
1267 if (init->target != KVM_ARM_TARGET_GENERIC_V8 &&
1268 init->target != kvm_target_cpu())
1271 ret = kvm_vcpu_init_check_features(vcpu, init);
1275 if (!kvm_vcpu_initialized(vcpu))
1276 return __kvm_vcpu_set_target(vcpu, init);
1278 if (kvm_vcpu_init_changed(vcpu, init))
1281 return kvm_reset_vcpu(vcpu);
1284 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
1285 struct kvm_vcpu_init *init)
1287 bool power_off = false;
1291 * Treat the power-off vCPU feature as ephemeral. Clear the bit to avoid
1292 * reflecting it in the finalized feature set, thus limiting its scope
1293 * to a single KVM_ARM_VCPU_INIT call.
1295 if (init->features[0] & BIT(KVM_ARM_VCPU_POWER_OFF)) {
1296 init->features[0] &= ~BIT(KVM_ARM_VCPU_POWER_OFF);
1300 ret = kvm_vcpu_set_target(vcpu, init);
1305 * Ensure a rebooted VM will fault in RAM pages and detect if the
1306 * guest MMU is turned off and flush the caches as needed.
1308 * S2FWB enforces all memory accesses to RAM being cacheable,
1309 * ensuring that the data side is always coherent. We still
1310 * need to invalidate the I-cache though, as FWB does *not*
1311 * imply CTR_EL0.DIC.
1313 if (vcpu_has_run_once(vcpu)) {
1314 if (!cpus_have_final_cap(ARM64_HAS_STAGE2_FWB))
1315 stage2_unmap_vm(vcpu->kvm);
1317 icache_inval_all_pou();
1320 vcpu_reset_hcr(vcpu);
1321 vcpu->arch.cptr_el2 = kvm_get_reset_cptr_el2(vcpu);
1324 * Handle the "start in power-off" case.
1326 spin_lock(&vcpu->arch.mp_state_lock);
1329 __kvm_arm_vcpu_power_off(vcpu);
1331 WRITE_ONCE(vcpu->arch.mp_state.mp_state, KVM_MP_STATE_RUNNABLE);
1333 spin_unlock(&vcpu->arch.mp_state_lock);
1338 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
1339 struct kvm_device_attr *attr)
1343 switch (attr->group) {
1345 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
1352 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
1353 struct kvm_device_attr *attr)
1357 switch (attr->group) {
1359 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
1366 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
1367 struct kvm_device_attr *attr)
1371 switch (attr->group) {
1373 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
1380 static int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
1381 struct kvm_vcpu_events *events)
1383 memset(events, 0, sizeof(*events));
1385 return __kvm_arm_vcpu_get_events(vcpu, events);
1388 static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
1389 struct kvm_vcpu_events *events)
1393 /* check whether the reserved field is zero */
1394 for (i = 0; i < ARRAY_SIZE(events->reserved); i++)
1395 if (events->reserved[i])
1398 /* check whether the pad field is zero */
1399 for (i = 0; i < ARRAY_SIZE(events->exception.pad); i++)
1400 if (events->exception.pad[i])
1403 return __kvm_arm_vcpu_set_events(vcpu, events);
1406 long kvm_arch_vcpu_ioctl(struct file *filp,
1407 unsigned int ioctl, unsigned long arg)
1409 struct kvm_vcpu *vcpu = filp->private_data;
1410 void __user *argp = (void __user *)arg;
1411 struct kvm_device_attr attr;
1415 case KVM_ARM_VCPU_INIT: {
1416 struct kvm_vcpu_init init;
1419 if (copy_from_user(&init, argp, sizeof(init)))
1422 r = kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
1425 case KVM_SET_ONE_REG:
1426 case KVM_GET_ONE_REG: {
1427 struct kvm_one_reg reg;
1430 if (unlikely(!kvm_vcpu_initialized(vcpu)))
1434 if (copy_from_user(®, argp, sizeof(reg)))
1438 * We could owe a reset due to PSCI. Handle the pending reset
1439 * here to ensure userspace register accesses are ordered after
1442 if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
1443 kvm_reset_vcpu(vcpu);
1445 if (ioctl == KVM_SET_ONE_REG)
1446 r = kvm_arm_set_reg(vcpu, ®);
1448 r = kvm_arm_get_reg(vcpu, ®);
1451 case KVM_GET_REG_LIST: {
1452 struct kvm_reg_list __user *user_list = argp;
1453 struct kvm_reg_list reg_list;
1457 if (unlikely(!kvm_vcpu_initialized(vcpu)))
1461 if (!kvm_arm_vcpu_is_finalized(vcpu))
1465 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
1468 reg_list.n = kvm_arm_num_regs(vcpu);
1469 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
1474 r = kvm_arm_copy_reg_indices(vcpu, user_list->reg);
1477 case KVM_SET_DEVICE_ATTR: {
1479 if (copy_from_user(&attr, argp, sizeof(attr)))
1481 r = kvm_arm_vcpu_set_attr(vcpu, &attr);
1484 case KVM_GET_DEVICE_ATTR: {
1486 if (copy_from_user(&attr, argp, sizeof(attr)))
1488 r = kvm_arm_vcpu_get_attr(vcpu, &attr);
1491 case KVM_HAS_DEVICE_ATTR: {
1493 if (copy_from_user(&attr, argp, sizeof(attr)))
1495 r = kvm_arm_vcpu_has_attr(vcpu, &attr);
1498 case KVM_GET_VCPU_EVENTS: {
1499 struct kvm_vcpu_events events;
1501 if (kvm_arm_vcpu_get_events(vcpu, &events))
1504 if (copy_to_user(argp, &events, sizeof(events)))
1509 case KVM_SET_VCPU_EVENTS: {
1510 struct kvm_vcpu_events events;
1512 if (copy_from_user(&events, argp, sizeof(events)))
1515 return kvm_arm_vcpu_set_events(vcpu, &events);
1517 case KVM_ARM_VCPU_FINALIZE: {
1520 if (!kvm_vcpu_initialized(vcpu))
1523 if (get_user(what, (const int __user *)argp))
1526 return kvm_arm_vcpu_finalize(vcpu, what);
1535 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
1540 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
1541 struct kvm_arm_device_addr *dev_addr)
1543 switch (FIELD_GET(KVM_ARM_DEVICE_ID_MASK, dev_addr->id)) {
1544 case KVM_ARM_DEVICE_VGIC_V2:
1547 return kvm_set_legacy_vgic_v2_addr(kvm, dev_addr);
1553 static int kvm_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1555 switch (attr->group) {
1556 case KVM_ARM_VM_SMCCC_CTRL:
1557 return kvm_vm_smccc_has_attr(kvm, attr);
1563 static int kvm_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1565 switch (attr->group) {
1566 case KVM_ARM_VM_SMCCC_CTRL:
1567 return kvm_vm_smccc_set_attr(kvm, attr);
1573 int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
1575 struct kvm *kvm = filp->private_data;
1576 void __user *argp = (void __user *)arg;
1577 struct kvm_device_attr attr;
1580 case KVM_CREATE_IRQCHIP: {
1584 mutex_lock(&kvm->lock);
1585 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1586 mutex_unlock(&kvm->lock);
1589 case KVM_ARM_SET_DEVICE_ADDR: {
1590 struct kvm_arm_device_addr dev_addr;
1592 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1594 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1596 case KVM_ARM_PREFERRED_TARGET: {
1597 struct kvm_vcpu_init init = {
1598 .target = KVM_ARM_TARGET_GENERIC_V8,
1601 if (copy_to_user(argp, &init, sizeof(init)))
1606 case KVM_ARM_MTE_COPY_TAGS: {
1607 struct kvm_arm_copy_mte_tags copy_tags;
1609 if (copy_from_user(©_tags, argp, sizeof(copy_tags)))
1611 return kvm_vm_ioctl_mte_copy_tags(kvm, ©_tags);
1613 case KVM_ARM_SET_COUNTER_OFFSET: {
1614 struct kvm_arm_counter_offset offset;
1616 if (copy_from_user(&offset, argp, sizeof(offset)))
1618 return kvm_vm_ioctl_set_counter_offset(kvm, &offset);
1620 case KVM_HAS_DEVICE_ATTR: {
1621 if (copy_from_user(&attr, argp, sizeof(attr)))
1624 return kvm_vm_has_attr(kvm, &attr);
1626 case KVM_SET_DEVICE_ATTR: {
1627 if (copy_from_user(&attr, argp, sizeof(attr)))
1630 return kvm_vm_set_attr(kvm, &attr);
1637 /* unlocks vcpus from @vcpu_lock_idx and smaller */
1638 static void unlock_vcpus(struct kvm *kvm, int vcpu_lock_idx)
1640 struct kvm_vcpu *tmp_vcpu;
1642 for (; vcpu_lock_idx >= 0; vcpu_lock_idx--) {
1643 tmp_vcpu = kvm_get_vcpu(kvm, vcpu_lock_idx);
1644 mutex_unlock(&tmp_vcpu->mutex);
1648 void unlock_all_vcpus(struct kvm *kvm)
1650 lockdep_assert_held(&kvm->lock);
1652 unlock_vcpus(kvm, atomic_read(&kvm->online_vcpus) - 1);
1655 /* Returns true if all vcpus were locked, false otherwise */
1656 bool lock_all_vcpus(struct kvm *kvm)
1658 struct kvm_vcpu *tmp_vcpu;
1661 lockdep_assert_held(&kvm->lock);
1664 * Any time a vcpu is in an ioctl (including running), the
1665 * core KVM code tries to grab the vcpu->mutex.
1667 * By grabbing the vcpu->mutex of all VCPUs we ensure that no
1668 * other VCPUs can fiddle with the state while we access it.
1670 kvm_for_each_vcpu(c, tmp_vcpu, kvm) {
1671 if (!mutex_trylock(&tmp_vcpu->mutex)) {
1672 unlock_vcpus(kvm, c - 1);
1680 static unsigned long nvhe_percpu_size(void)
1682 return (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_end) -
1683 (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_start);
1686 static unsigned long nvhe_percpu_order(void)
1688 unsigned long size = nvhe_percpu_size();
1690 return size ? get_order(size) : 0;
1693 /* A lookup table holding the hypervisor VA for each vector slot */
1694 static void *hyp_spectre_vector_selector[BP_HARDEN_EL2_SLOTS];
1696 static void kvm_init_vector_slot(void *base, enum arm64_hyp_spectre_vector slot)
1698 hyp_spectre_vector_selector[slot] = __kvm_vector_slot2addr(base, slot);
1701 static int kvm_init_vector_slots(void)
1706 base = kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector));
1707 kvm_init_vector_slot(base, HYP_VECTOR_DIRECT);
1709 base = kern_hyp_va(kvm_ksym_ref(__bp_harden_hyp_vecs));
1710 kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_DIRECT);
1712 if (kvm_system_needs_idmapped_vectors() &&
1713 !is_protected_kvm_enabled()) {
1714 err = create_hyp_exec_mappings(__pa_symbol(__bp_harden_hyp_vecs),
1715 __BP_HARDEN_HYP_VECS_SZ, &base);
1720 kvm_init_vector_slot(base, HYP_VECTOR_INDIRECT);
1721 kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_INDIRECT);
1725 static void __init cpu_prepare_hyp_mode(int cpu, u32 hyp_va_bits)
1727 struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
1731 * Calculate the raw per-cpu offset without a translation from the
1732 * kernel's mapping to the linear mapping, and store it in tpidr_el2
1733 * so that we can use adr_l to access per-cpu variables in EL2.
1734 * Also drop the KASAN tag which gets in the way...
1736 params->tpidr_el2 = (unsigned long)kasan_reset_tag(per_cpu_ptr_nvhe_sym(__per_cpu_start, cpu)) -
1737 (unsigned long)kvm_ksym_ref(CHOOSE_NVHE_SYM(__per_cpu_start));
1739 params->mair_el2 = read_sysreg(mair_el1);
1741 tcr = read_sysreg(tcr_el1);
1742 if (cpus_have_final_cap(ARM64_KVM_HVHE)) {
1743 tcr |= TCR_EPD1_MASK;
1745 tcr &= TCR_EL2_MASK;
1746 tcr |= TCR_EL2_RES1;
1748 tcr &= ~TCR_T0SZ_MASK;
1749 tcr |= TCR_T0SZ(hyp_va_bits);
1750 params->tcr_el2 = tcr;
1752 params->pgd_pa = kvm_mmu_get_httbr();
1753 if (is_protected_kvm_enabled())
1754 params->hcr_el2 = HCR_HOST_NVHE_PROTECTED_FLAGS;
1756 params->hcr_el2 = HCR_HOST_NVHE_FLAGS;
1757 if (cpus_have_final_cap(ARM64_KVM_HVHE))
1758 params->hcr_el2 |= HCR_E2H;
1759 params->vttbr = params->vtcr = 0;
1762 * Flush the init params from the data cache because the struct will
1763 * be read while the MMU is off.
1765 kvm_flush_dcache_to_poc(params, sizeof(*params));
1768 static void hyp_install_host_vector(void)
1770 struct kvm_nvhe_init_params *params;
1771 struct arm_smccc_res res;
1773 /* Switch from the HYP stub to our own HYP init vector */
1774 __hyp_set_vectors(kvm_get_idmap_vector());
1777 * Call initialization code, and switch to the full blown HYP code.
1778 * If the cpucaps haven't been finalized yet, something has gone very
1779 * wrong, and hyp will crash and burn when it uses any
1780 * cpus_have_*_cap() wrapper.
1782 BUG_ON(!system_capabilities_finalized());
1783 params = this_cpu_ptr_nvhe_sym(kvm_init_params);
1784 arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(__kvm_hyp_init), virt_to_phys(params), &res);
1785 WARN_ON(res.a0 != SMCCC_RET_SUCCESS);
1788 static void cpu_init_hyp_mode(void)
1790 hyp_install_host_vector();
1793 * Disabling SSBD on a non-VHE system requires us to enable SSBS
1796 if (this_cpu_has_cap(ARM64_SSBS) &&
1797 arm64_get_spectre_v4_state() == SPECTRE_VULNERABLE) {
1798 kvm_call_hyp_nvhe(__kvm_enable_ssbs);
1802 static void cpu_hyp_reset(void)
1804 if (!is_kernel_in_hyp_mode())
1805 __hyp_reset_vectors();
1809 * EL2 vectors can be mapped and rerouted in a number of ways,
1810 * depending on the kernel configuration and CPU present:
1812 * - If the CPU is affected by Spectre-v2, the hardening sequence is
1813 * placed in one of the vector slots, which is executed before jumping
1814 * to the real vectors.
1816 * - If the CPU also has the ARM64_SPECTRE_V3A cap, the slot
1817 * containing the hardening sequence is mapped next to the idmap page,
1818 * and executed before jumping to the real vectors.
1820 * - If the CPU only has the ARM64_SPECTRE_V3A cap, then an
1821 * empty slot is selected, mapped next to the idmap page, and
1822 * executed before jumping to the real vectors.
1824 * Note that ARM64_SPECTRE_V3A is somewhat incompatible with
1825 * VHE, as we don't have hypervisor-specific mappings. If the system
1826 * is VHE and yet selects this capability, it will be ignored.
1828 static void cpu_set_hyp_vector(void)
1830 struct bp_hardening_data *data = this_cpu_ptr(&bp_hardening_data);
1831 void *vector = hyp_spectre_vector_selector[data->slot];
1833 if (!is_protected_kvm_enabled())
1834 *this_cpu_ptr_hyp_sym(kvm_hyp_vector) = (unsigned long)vector;
1836 kvm_call_hyp_nvhe(__pkvm_cpu_set_vector, data->slot);
1839 static void cpu_hyp_init_context(void)
1841 kvm_init_host_cpu_context(&this_cpu_ptr_hyp_sym(kvm_host_data)->host_ctxt);
1843 if (!is_kernel_in_hyp_mode())
1844 cpu_init_hyp_mode();
1847 static void cpu_hyp_init_features(void)
1849 cpu_set_hyp_vector();
1850 kvm_arm_init_debug();
1852 if (is_kernel_in_hyp_mode())
1853 kvm_timer_init_vhe();
1856 kvm_vgic_init_cpu_hardware();
1859 static void cpu_hyp_reinit(void)
1862 cpu_hyp_init_context();
1863 cpu_hyp_init_features();
1866 static void cpu_hyp_init(void *discard)
1868 if (!__this_cpu_read(kvm_hyp_initialized)) {
1870 __this_cpu_write(kvm_hyp_initialized, 1);
1874 static void cpu_hyp_uninit(void *discard)
1876 if (__this_cpu_read(kvm_hyp_initialized)) {
1878 __this_cpu_write(kvm_hyp_initialized, 0);
1882 int kvm_arch_hardware_enable(void)
1885 * Most calls to this function are made with migration
1886 * disabled, but not with preemption disabled. The former is
1887 * enough to ensure correctness, but most of the helpers
1888 * expect the later and will throw a tantrum otherwise.
1902 void kvm_arch_hardware_disable(void)
1904 kvm_timer_cpu_down();
1905 kvm_vgic_cpu_down();
1907 if (!is_protected_kvm_enabled())
1908 cpu_hyp_uninit(NULL);
1911 #ifdef CONFIG_CPU_PM
1912 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1917 * kvm_hyp_initialized is left with its old value over
1918 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1923 if (__this_cpu_read(kvm_hyp_initialized))
1925 * don't update kvm_hyp_initialized here
1926 * so that the hyp will be re-enabled
1927 * when we resume. See below.
1932 case CPU_PM_ENTER_FAILED:
1934 if (__this_cpu_read(kvm_hyp_initialized))
1935 /* The hyp was enabled before suspend. */
1945 static struct notifier_block hyp_init_cpu_pm_nb = {
1946 .notifier_call = hyp_init_cpu_pm_notifier,
1949 static void __init hyp_cpu_pm_init(void)
1951 if (!is_protected_kvm_enabled())
1952 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1954 static void __init hyp_cpu_pm_exit(void)
1956 if (!is_protected_kvm_enabled())
1957 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1960 static inline void __init hyp_cpu_pm_init(void)
1963 static inline void __init hyp_cpu_pm_exit(void)
1968 static void __init init_cpu_logical_map(void)
1973 * Copy the MPIDR <-> logical CPU ID mapping to hyp.
1974 * Only copy the set of online CPUs whose features have been checked
1975 * against the finalized system capabilities. The hypervisor will not
1976 * allow any other CPUs from the `possible` set to boot.
1978 for_each_online_cpu(cpu)
1979 hyp_cpu_logical_map[cpu] = cpu_logical_map(cpu);
1982 #define init_psci_0_1_impl_state(config, what) \
1983 config.psci_0_1_ ## what ## _implemented = psci_ops.what
1985 static bool __init init_psci_relay(void)
1988 * If PSCI has not been initialized, protected KVM cannot install
1989 * itself on newly booted CPUs.
1991 if (!psci_ops.get_version) {
1992 kvm_err("Cannot initialize protected mode without PSCI\n");
1996 kvm_host_psci_config.version = psci_ops.get_version();
1997 kvm_host_psci_config.smccc_version = arm_smccc_get_version();
1999 if (kvm_host_psci_config.version == PSCI_VERSION(0, 1)) {
2000 kvm_host_psci_config.function_ids_0_1 = get_psci_0_1_function_ids();
2001 init_psci_0_1_impl_state(kvm_host_psci_config, cpu_suspend);
2002 init_psci_0_1_impl_state(kvm_host_psci_config, cpu_on);
2003 init_psci_0_1_impl_state(kvm_host_psci_config, cpu_off);
2004 init_psci_0_1_impl_state(kvm_host_psci_config, migrate);
2009 static int __init init_subsystems(void)
2014 * Enable hardware so that subsystem initialisation can access EL2.
2016 on_each_cpu(cpu_hyp_init, NULL, 1);
2019 * Register CPU lower-power notifier
2024 * Init HYP view of VGIC
2026 err = kvm_vgic_hyp_init();
2029 vgic_present = true;
2033 vgic_present = false;
2041 * Init HYP architected timer support
2043 err = kvm_timer_hyp_init(vgic_present);
2047 kvm_register_perf_callbacks(NULL);
2053 if (err || !is_protected_kvm_enabled())
2054 on_each_cpu(cpu_hyp_uninit, NULL, 1);
2059 static void __init teardown_subsystems(void)
2061 kvm_unregister_perf_callbacks();
2065 static void __init teardown_hyp_mode(void)
2070 for_each_possible_cpu(cpu) {
2071 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
2072 free_pages(kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu], nvhe_percpu_order());
2076 static int __init do_pkvm_init(u32 hyp_va_bits)
2078 void *per_cpu_base = kvm_ksym_ref(kvm_nvhe_sym(kvm_arm_hyp_percpu_base));
2082 cpu_hyp_init_context();
2083 ret = kvm_call_hyp_nvhe(__pkvm_init, hyp_mem_base, hyp_mem_size,
2084 num_possible_cpus(), kern_hyp_va(per_cpu_base),
2086 cpu_hyp_init_features();
2089 * The stub hypercalls are now disabled, so set our local flag to
2090 * prevent a later re-init attempt in kvm_arch_hardware_enable().
2092 __this_cpu_write(kvm_hyp_initialized, 1);
2098 static u64 get_hyp_id_aa64pfr0_el1(void)
2101 * Track whether the system isn't affected by spectre/meltdown in the
2102 * hypervisor's view of id_aa64pfr0_el1, used for protected VMs.
2103 * Although this is per-CPU, we make it global for simplicity, e.g., not
2104 * to have to worry about vcpu migration.
2106 * Unlike for non-protected VMs, userspace cannot override this for
2109 u64 val = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);
2111 val &= ~(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2) |
2112 ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3));
2114 val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV2),
2115 arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED);
2116 val |= FIELD_PREP(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_CSV3),
2117 arm64_get_meltdown_state() == SPECTRE_UNAFFECTED);
2122 static void kvm_hyp_init_symbols(void)
2124 kvm_nvhe_sym(id_aa64pfr0_el1_sys_val) = get_hyp_id_aa64pfr0_el1();
2125 kvm_nvhe_sym(id_aa64pfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1);
2126 kvm_nvhe_sym(id_aa64isar0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR0_EL1);
2127 kvm_nvhe_sym(id_aa64isar1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR1_EL1);
2128 kvm_nvhe_sym(id_aa64isar2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64ISAR2_EL1);
2129 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
2130 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
2131 kvm_nvhe_sym(id_aa64mmfr2_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR2_EL1);
2132 kvm_nvhe_sym(id_aa64smfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64SMFR0_EL1);
2133 kvm_nvhe_sym(__icache_flags) = __icache_flags;
2134 kvm_nvhe_sym(kvm_arm_vmid_bits) = kvm_arm_vmid_bits;
2137 static int __init kvm_hyp_init_protection(u32 hyp_va_bits)
2139 void *addr = phys_to_virt(hyp_mem_base);
2142 ret = create_hyp_mappings(addr, addr + hyp_mem_size, PAGE_HYP);
2146 ret = do_pkvm_init(hyp_va_bits);
2155 static void pkvm_hyp_init_ptrauth(void)
2157 struct kvm_cpu_context *hyp_ctxt;
2160 for_each_possible_cpu(cpu) {
2161 hyp_ctxt = per_cpu_ptr_nvhe_sym(kvm_hyp_ctxt, cpu);
2162 hyp_ctxt->sys_regs[APIAKEYLO_EL1] = get_random_long();
2163 hyp_ctxt->sys_regs[APIAKEYHI_EL1] = get_random_long();
2164 hyp_ctxt->sys_regs[APIBKEYLO_EL1] = get_random_long();
2165 hyp_ctxt->sys_regs[APIBKEYHI_EL1] = get_random_long();
2166 hyp_ctxt->sys_regs[APDAKEYLO_EL1] = get_random_long();
2167 hyp_ctxt->sys_regs[APDAKEYHI_EL1] = get_random_long();
2168 hyp_ctxt->sys_regs[APDBKEYLO_EL1] = get_random_long();
2169 hyp_ctxt->sys_regs[APDBKEYHI_EL1] = get_random_long();
2170 hyp_ctxt->sys_regs[APGAKEYLO_EL1] = get_random_long();
2171 hyp_ctxt->sys_regs[APGAKEYHI_EL1] = get_random_long();
2175 /* Inits Hyp-mode on all online CPUs */
2176 static int __init init_hyp_mode(void)
2183 * The protected Hyp-mode cannot be initialized if the memory pool
2184 * allocation has failed.
2186 if (is_protected_kvm_enabled() && !hyp_mem_base)
2190 * Allocate Hyp PGD and setup Hyp identity mapping
2192 err = kvm_mmu_init(&hyp_va_bits);
2197 * Allocate stack pages for Hypervisor-mode
2199 for_each_possible_cpu(cpu) {
2200 unsigned long stack_page;
2202 stack_page = __get_free_page(GFP_KERNEL);
2208 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
2212 * Allocate and initialize pages for Hypervisor-mode percpu regions.
2214 for_each_possible_cpu(cpu) {
2218 page = alloc_pages(GFP_KERNEL, nvhe_percpu_order());
2224 page_addr = page_address(page);
2225 memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size());
2226 kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu] = (unsigned long)page_addr;
2230 * Map the Hyp-code called directly from the host
2232 err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
2233 kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
2235 kvm_err("Cannot map world-switch code\n");
2239 err = create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start),
2240 kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO);
2242 kvm_err("Cannot map .hyp.rodata section\n");
2246 err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
2247 kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
2249 kvm_err("Cannot map rodata section\n");
2254 * .hyp.bss is guaranteed to be placed at the beginning of the .bss
2255 * section thanks to an assertion in the linker script. Map it RW and
2256 * the rest of .bss RO.
2258 err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_start),
2259 kvm_ksym_ref(__hyp_bss_end), PAGE_HYP);
2261 kvm_err("Cannot map hyp bss section: %d\n", err);
2265 err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_end),
2266 kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
2268 kvm_err("Cannot map bss section\n");
2273 * Map the Hyp stack pages
2275 for_each_possible_cpu(cpu) {
2276 struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
2277 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
2279 err = create_hyp_stack(__pa(stack_page), ¶ms->stack_hyp_va);
2281 kvm_err("Cannot map hyp stack\n");
2286 * Save the stack PA in nvhe_init_params. This will be needed
2287 * to recreate the stack mapping in protected nVHE mode.
2288 * __hyp_pa() won't do the right thing there, since the stack
2289 * has been mapped in the flexible private VA space.
2291 params->stack_pa = __pa(stack_page);
2294 for_each_possible_cpu(cpu) {
2295 char *percpu_begin = (char *)kvm_nvhe_sym(kvm_arm_hyp_percpu_base)[cpu];
2296 char *percpu_end = percpu_begin + nvhe_percpu_size();
2298 /* Map Hyp percpu pages */
2299 err = create_hyp_mappings(percpu_begin, percpu_end, PAGE_HYP);
2301 kvm_err("Cannot map hyp percpu region\n");
2305 /* Prepare the CPU initialization parameters */
2306 cpu_prepare_hyp_mode(cpu, hyp_va_bits);
2309 kvm_hyp_init_symbols();
2311 if (is_protected_kvm_enabled()) {
2312 if (IS_ENABLED(CONFIG_ARM64_PTR_AUTH_KERNEL) &&
2313 cpus_have_final_cap(ARM64_HAS_ADDRESS_AUTH))
2314 pkvm_hyp_init_ptrauth();
2316 init_cpu_logical_map();
2318 if (!init_psci_relay()) {
2323 err = kvm_hyp_init_protection(hyp_va_bits);
2325 kvm_err("Failed to init hyp memory protection\n");
2333 teardown_hyp_mode();
2334 kvm_err("error initializing Hyp mode: %d\n", err);
2338 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
2340 struct kvm_vcpu *vcpu;
2343 mpidr &= MPIDR_HWID_BITMASK;
2344 kvm_for_each_vcpu(i, vcpu, kvm) {
2345 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
2351 bool kvm_arch_irqchip_in_kernel(struct kvm *kvm)
2353 return irqchip_in_kernel(kvm);
2356 bool kvm_arch_has_irq_bypass(void)
2361 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
2362 struct irq_bypass_producer *prod)
2364 struct kvm_kernel_irqfd *irqfd =
2365 container_of(cons, struct kvm_kernel_irqfd, consumer);
2367 return kvm_vgic_v4_set_forwarding(irqfd->kvm, prod->irq,
2370 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
2371 struct irq_bypass_producer *prod)
2373 struct kvm_kernel_irqfd *irqfd =
2374 container_of(cons, struct kvm_kernel_irqfd, consumer);
2376 kvm_vgic_v4_unset_forwarding(irqfd->kvm, prod->irq,
2380 void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
2382 struct kvm_kernel_irqfd *irqfd =
2383 container_of(cons, struct kvm_kernel_irqfd, consumer);
2385 kvm_arm_halt_guest(irqfd->kvm);
2388 void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
2390 struct kvm_kernel_irqfd *irqfd =
2391 container_of(cons, struct kvm_kernel_irqfd, consumer);
2393 kvm_arm_resume_guest(irqfd->kvm);
2396 /* Initialize Hyp-mode and memory mappings on all CPUs */
2397 static __init int kvm_arm_init(void)
2402 if (!is_hyp_mode_available()) {
2403 kvm_info("HYP mode not available\n");
2407 if (kvm_get_mode() == KVM_MODE_NONE) {
2408 kvm_info("KVM disabled from command line\n");
2412 err = kvm_sys_reg_table_init();
2414 kvm_info("Error initializing system register tables");
2418 in_hyp_mode = is_kernel_in_hyp_mode();
2420 if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) ||
2421 cpus_have_final_cap(ARM64_WORKAROUND_1508412))
2422 kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \
2423 "Only trusted guests should be used on this system.\n");
2425 err = kvm_set_ipa_limit();
2429 err = kvm_arm_init_sve();
2433 err = kvm_arm_vmid_alloc_init();
2435 kvm_err("Failed to initialize VMID allocator.\n");
2440 err = init_hyp_mode();
2445 err = kvm_init_vector_slots();
2447 kvm_err("Cannot initialise vector slots\n");
2451 err = init_subsystems();
2455 if (is_protected_kvm_enabled()) {
2456 kvm_info("Protected nVHE mode initialized successfully\n");
2457 } else if (in_hyp_mode) {
2458 kvm_info("VHE mode initialized successfully\n");
2460 kvm_info("Hyp mode initialized successfully\n");
2464 * FIXME: Do something reasonable if kvm_init() fails after pKVM
2465 * hypervisor protection is finalized.
2467 err = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE);
2471 kvm_arm_initialised = true;
2476 teardown_subsystems();
2479 teardown_hyp_mode();
2481 kvm_arm_vmid_alloc_free();
2485 static int __init early_kvm_mode_cfg(char *arg)
2490 if (strcmp(arg, "none") == 0) {
2491 kvm_mode = KVM_MODE_NONE;
2495 if (!is_hyp_mode_available()) {
2496 pr_warn_once("KVM is not available. Ignoring kvm-arm.mode\n");
2500 if (strcmp(arg, "protected") == 0) {
2501 if (!is_kernel_in_hyp_mode())
2502 kvm_mode = KVM_MODE_PROTECTED;
2504 pr_warn_once("Protected KVM not available with VHE\n");
2509 if (strcmp(arg, "nvhe") == 0 && !WARN_ON(is_kernel_in_hyp_mode())) {
2510 kvm_mode = KVM_MODE_DEFAULT;
2514 if (strcmp(arg, "nested") == 0 && !WARN_ON(!is_kernel_in_hyp_mode())) {
2515 kvm_mode = KVM_MODE_NV;
2521 early_param("kvm-arm.mode", early_kvm_mode_cfg);
2523 enum kvm_mode kvm_get_mode(void)
2528 module_init(kvm_arm_init);