1
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5
6
7#include <linux/bug.h>
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>
16#include <linux/fs.h>
17#include <linux/mman.h>
18#include <linux/sched.h>
19#include <linux/kmemleak.h>
20#include <linux/kvm.h>
21#include <linux/kvm_irqfd.h>
22#include <linux/irqbypass.h>
23#include <linux/sched/stat.h>
24#include <linux/psci.h>
25#include <trace/events/kvm.h>
26
27#define CREATE_TRACE_POINTS
28#include "trace_arm.h"
29
30#include <linux/uaccess.h>
31#include <asm/ptrace.h>
32#include <asm/mman.h>
33#include <asm/tlbflush.h>
34#include <asm/cacheflush.h>
35#include <asm/cpufeature.h>
36#include <asm/virt.h>
37#include <asm/kvm_arm.h>
38#include <asm/kvm_asm.h>
39#include <asm/kvm_mmu.h>
40#include <asm/kvm_emulate.h>
41#include <asm/sections.h>
42
43#include <kvm/arm_hypercalls.h>
44#include <kvm/arm_pmu.h>
45#include <kvm/arm_psci.h>
46
47static enum kvm_mode kvm_mode = KVM_MODE_DEFAULT;
48DEFINE_STATIC_KEY_FALSE(kvm_protected_mode_initialized);
49
50DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector);
51
52static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
53unsigned long kvm_arm_hyp_percpu_base[NR_CPUS];
54DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
55
56
57static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
58static u32 kvm_next_vmid;
59static DEFINE_SPINLOCK(kvm_vmid_lock);
60
61static bool vgic_present;
62
63static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
64DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
65
66int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
67{
68 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
69}
70
71int kvm_arch_hardware_setup(void *opaque)
72{
73 return 0;
74}
75
76int kvm_arch_check_processor_compat(void *opaque)
77{
78 return 0;
79}
80
81int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
82 struct kvm_enable_cap *cap)
83{
84 int r;
85
86 if (cap->flags)
87 return -EINVAL;
88
89 switch (cap->cap) {
90 case KVM_CAP_ARM_NISV_TO_USER:
91 r = 0;
92 kvm->arch.return_nisv_io_abort_to_user = true;
93 break;
94 case KVM_CAP_ARM_MTE:
95 mutex_lock(&kvm->lock);
96 if (!system_supports_mte() || kvm->created_vcpus) {
97 r = -EINVAL;
98 } else {
99 r = 0;
100 kvm->arch.mte_enabled = true;
101 }
102 mutex_unlock(&kvm->lock);
103 break;
104 default:
105 r = -EINVAL;
106 break;
107 }
108
109 return r;
110}
111
112static int kvm_arm_default_max_vcpus(void)
113{
114 return vgic_present ? kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
115}
116
117static void set_default_spectre(struct kvm *kvm)
118{
119
120
121
122
123
124
125
126
127 if (arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED)
128 kvm->arch.pfr0_csv2 = 1;
129 if (arm64_get_meltdown_state() == SPECTRE_UNAFFECTED)
130 kvm->arch.pfr0_csv3 = 1;
131}
132
133
134
135
136
137int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
138{
139 int ret;
140
141 ret = kvm_arm_setup_stage2(kvm, type);
142 if (ret)
143 return ret;
144
145 ret = kvm_init_stage2_mmu(kvm, &kvm->arch.mmu);
146 if (ret)
147 return ret;
148
149 ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
150 if (ret)
151 goto out_free_stage2_pgd;
152
153 kvm_vgic_early_init(kvm);
154
155
156 kvm->arch.max_vcpus = kvm_arm_default_max_vcpus();
157
158 set_default_spectre(kvm);
159
160 return ret;
161out_free_stage2_pgd:
162 kvm_free_stage2_pgd(&kvm->arch.mmu);
163 return ret;
164}
165
166vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
167{
168 return VM_FAULT_SIGBUS;
169}
170
171
172
173
174
175
176void kvm_arch_destroy_vm(struct kvm *kvm)
177{
178 int i;
179
180 bitmap_free(kvm->arch.pmu_filter);
181
182 kvm_vgic_destroy(kvm);
183
184 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
185 if (kvm->vcpus[i]) {
186 kvm_vcpu_destroy(kvm->vcpus[i]);
187 kvm->vcpus[i] = NULL;
188 }
189 }
190 atomic_set(&kvm->online_vcpus, 0);
191}
192
193int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
194{
195 int r;
196 switch (ext) {
197 case KVM_CAP_IRQCHIP:
198 r = vgic_present;
199 break;
200 case KVM_CAP_IOEVENTFD:
201 case KVM_CAP_DEVICE_CTRL:
202 case KVM_CAP_USER_MEMORY:
203 case KVM_CAP_SYNC_MMU:
204 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
205 case KVM_CAP_ONE_REG:
206 case KVM_CAP_ARM_PSCI:
207 case KVM_CAP_ARM_PSCI_0_2:
208 case KVM_CAP_READONLY_MEM:
209 case KVM_CAP_MP_STATE:
210 case KVM_CAP_IMMEDIATE_EXIT:
211 case KVM_CAP_VCPU_EVENTS:
212 case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
213 case KVM_CAP_ARM_NISV_TO_USER:
214 case KVM_CAP_ARM_INJECT_EXT_DABT:
215 case KVM_CAP_SET_GUEST_DEBUG:
216 case KVM_CAP_VCPU_ATTRIBUTES:
217 case KVM_CAP_PTP_KVM:
218 r = 1;
219 break;
220 case KVM_CAP_SET_GUEST_DEBUG2:
221 return KVM_GUESTDBG_VALID_MASK;
222 case KVM_CAP_ARM_SET_DEVICE_ADDR:
223 r = 1;
224 break;
225 case KVM_CAP_NR_VCPUS:
226 r = num_online_cpus();
227 break;
228 case KVM_CAP_MAX_VCPUS:
229 case KVM_CAP_MAX_VCPU_ID:
230 if (kvm)
231 r = kvm->arch.max_vcpus;
232 else
233 r = kvm_arm_default_max_vcpus();
234 break;
235 case KVM_CAP_MSI_DEVID:
236 if (!kvm)
237 r = -EINVAL;
238 else
239 r = kvm->arch.vgic.msis_require_devid;
240 break;
241 case KVM_CAP_ARM_USER_IRQ:
242
243
244
245
246 r = 1;
247 break;
248 case KVM_CAP_ARM_MTE:
249 r = system_supports_mte();
250 break;
251 case KVM_CAP_STEAL_TIME:
252 r = kvm_arm_pvtime_supported();
253 break;
254 case KVM_CAP_ARM_EL1_32BIT:
255 r = cpus_have_const_cap(ARM64_HAS_32BIT_EL1);
256 break;
257 case KVM_CAP_GUEST_DEBUG_HW_BPS:
258 r = get_num_brps();
259 break;
260 case KVM_CAP_GUEST_DEBUG_HW_WPS:
261 r = get_num_wrps();
262 break;
263 case KVM_CAP_ARM_PMU_V3:
264 r = kvm_arm_support_pmu_v3();
265 break;
266 case KVM_CAP_ARM_INJECT_SERROR_ESR:
267 r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
268 break;
269 case KVM_CAP_ARM_VM_IPA_SIZE:
270 r = get_kvm_ipa_limit();
271 break;
272 case KVM_CAP_ARM_SVE:
273 r = system_supports_sve();
274 break;
275 case KVM_CAP_ARM_PTRAUTH_ADDRESS:
276 case KVM_CAP_ARM_PTRAUTH_GENERIC:
277 r = system_has_full_ptr_auth();
278 break;
279 default:
280 r = 0;
281 }
282
283 return r;
284}
285
286long kvm_arch_dev_ioctl(struct file *filp,
287 unsigned int ioctl, unsigned long arg)
288{
289 return -EINVAL;
290}
291
292struct kvm *kvm_arch_alloc_vm(void)
293{
294 if (!has_vhe())
295 return kzalloc(sizeof(struct kvm), GFP_KERNEL);
296
297 return vzalloc(sizeof(struct kvm));
298}
299
300void kvm_arch_free_vm(struct kvm *kvm)
301{
302 if (!has_vhe())
303 kfree(kvm);
304 else
305 vfree(kvm);
306}
307
308int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
309{
310 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
311 return -EBUSY;
312
313 if (id >= kvm->arch.max_vcpus)
314 return -EINVAL;
315
316 return 0;
317}
318
319int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
320{
321 int err;
322
323
324 vcpu->arch.target = -1;
325 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
326
327 vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
328
329
330 kvm_timer_vcpu_init(vcpu);
331
332 kvm_pmu_vcpu_init(vcpu);
333
334 kvm_arm_reset_debug_ptr(vcpu);
335
336 kvm_arm_pvtime_vcpu_init(&vcpu->arch);
337
338 vcpu->arch.hw_mmu = &vcpu->kvm->arch.mmu;
339
340 err = kvm_vgic_vcpu_init(vcpu);
341 if (err)
342 return err;
343
344 return create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
345}
346
347void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
348{
349}
350
351void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
352{
353 if (vcpu->arch.has_run_once && unlikely(!irqchip_in_kernel(vcpu->kvm)))
354 static_branch_dec(&userspace_irqchip_in_use);
355
356 kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
357 kvm_timer_vcpu_terminate(vcpu);
358 kvm_pmu_vcpu_destroy(vcpu);
359
360 kvm_arm_vcpu_destroy(vcpu);
361}
362
363int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
364{
365 return kvm_timer_is_pending(vcpu);
366}
367
368void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
369{
370
371
372
373
374
375
376
377
378
379
380 preempt_disable();
381 kvm_vgic_vmcr_sync(vcpu);
382 vgic_v4_put(vcpu, true);
383 preempt_enable();
384}
385
386void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
387{
388 preempt_disable();
389 vgic_v4_load(vcpu);
390 preempt_enable();
391}
392
393void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
394{
395 struct kvm_s2_mmu *mmu;
396 int *last_ran;
397
398 mmu = vcpu->arch.hw_mmu;
399 last_ran = this_cpu_ptr(mmu->last_vcpu_ran);
400
401
402
403
404
405
406
407
408
409
410 if (*last_ran != vcpu->vcpu_id) {
411 kvm_call_hyp(__kvm_flush_cpu_context, mmu);
412 *last_ran = vcpu->vcpu_id;
413 }
414
415 vcpu->cpu = cpu;
416
417 kvm_vgic_load(vcpu);
418 kvm_timer_vcpu_load(vcpu);
419 if (has_vhe())
420 kvm_vcpu_load_sysregs_vhe(vcpu);
421 kvm_arch_vcpu_load_fp(vcpu);
422 kvm_vcpu_pmu_restore_guest(vcpu);
423 if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
424 kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
425
426 if (single_task_running())
427 vcpu_clear_wfx_traps(vcpu);
428 else
429 vcpu_set_wfx_traps(vcpu);
430
431 if (vcpu_has_ptrauth(vcpu))
432 vcpu_ptrauth_disable(vcpu);
433 kvm_arch_vcpu_load_debug_state_flags(vcpu);
434}
435
436void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
437{
438 kvm_arch_vcpu_put_debug_state_flags(vcpu);
439 kvm_arch_vcpu_put_fp(vcpu);
440 if (has_vhe())
441 kvm_vcpu_put_sysregs_vhe(vcpu);
442 kvm_timer_vcpu_put(vcpu);
443 kvm_vgic_put(vcpu);
444 kvm_vcpu_pmu_restore_host(vcpu);
445
446 vcpu->cpu = -1;
447}
448
449static void vcpu_power_off(struct kvm_vcpu *vcpu)
450{
451 vcpu->arch.power_off = true;
452 kvm_make_request(KVM_REQ_SLEEP, vcpu);
453 kvm_vcpu_kick(vcpu);
454}
455
456int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
457 struct kvm_mp_state *mp_state)
458{
459 if (vcpu->arch.power_off)
460 mp_state->mp_state = KVM_MP_STATE_STOPPED;
461 else
462 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
463
464 return 0;
465}
466
467int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
468 struct kvm_mp_state *mp_state)
469{
470 int ret = 0;
471
472 switch (mp_state->mp_state) {
473 case KVM_MP_STATE_RUNNABLE:
474 vcpu->arch.power_off = false;
475 break;
476 case KVM_MP_STATE_STOPPED:
477 vcpu_power_off(vcpu);
478 break;
479 default:
480 ret = -EINVAL;
481 }
482
483 return ret;
484}
485
486
487
488
489
490
491
492
493int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
494{
495 bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
496 return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
497 && !v->arch.power_off && !v->arch.pause);
498}
499
500bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
501{
502 return vcpu_mode_priv(vcpu);
503}
504
505
506static void exit_vm_noop(void *info)
507{
508}
509
510void force_vm_exit(const cpumask_t *mask)
511{
512 preempt_disable();
513 smp_call_function_many(mask, exit_vm_noop, NULL, true);
514 preempt_enable();
515}
516
517
518
519
520
521
522
523
524
525
526
527
528
529static bool need_new_vmid_gen(struct kvm_vmid *vmid)
530{
531 u64 current_vmid_gen = atomic64_read(&kvm_vmid_gen);
532 smp_rmb();
533 return unlikely(READ_ONCE(vmid->vmid_gen) != current_vmid_gen);
534}
535
536
537
538
539
540static void update_vmid(struct kvm_vmid *vmid)
541{
542 if (!need_new_vmid_gen(vmid))
543 return;
544
545 spin_lock(&kvm_vmid_lock);
546
547
548
549
550
551
552 if (!need_new_vmid_gen(vmid)) {
553 spin_unlock(&kvm_vmid_lock);
554 return;
555 }
556
557
558 if (unlikely(kvm_next_vmid == 0)) {
559 atomic64_inc(&kvm_vmid_gen);
560 kvm_next_vmid = 1;
561
562
563
564
565
566
567 force_vm_exit(cpu_all_mask);
568
569
570
571
572
573 kvm_call_hyp(__kvm_flush_vm_context);
574 }
575
576 WRITE_ONCE(vmid->vmid, kvm_next_vmid);
577 kvm_next_vmid++;
578 kvm_next_vmid &= (1 << kvm_get_vmid_bits()) - 1;
579
580 smp_wmb();
581 WRITE_ONCE(vmid->vmid_gen, atomic64_read(&kvm_vmid_gen));
582
583 spin_unlock(&kvm_vmid_lock);
584}
585
586static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
587{
588 struct kvm *kvm = vcpu->kvm;
589 int ret = 0;
590
591 if (likely(vcpu->arch.has_run_once))
592 return 0;
593
594 if (!kvm_arm_vcpu_is_finalized(vcpu))
595 return -EPERM;
596
597 vcpu->arch.has_run_once = true;
598
599 kvm_arm_vcpu_init_debug(vcpu);
600
601 if (likely(irqchip_in_kernel(kvm))) {
602
603
604
605
606 ret = kvm_vgic_map_resources(kvm);
607 if (ret)
608 return ret;
609 } else {
610
611
612
613
614 static_branch_inc(&userspace_irqchip_in_use);
615 }
616
617 ret = kvm_timer_enable(vcpu);
618 if (ret)
619 return ret;
620
621 ret = kvm_arm_pmu_v3_enable(vcpu);
622
623 return ret;
624}
625
626bool kvm_arch_intc_initialized(struct kvm *kvm)
627{
628 return vgic_initialized(kvm);
629}
630
631void kvm_arm_halt_guest(struct kvm *kvm)
632{
633 int i;
634 struct kvm_vcpu *vcpu;
635
636 kvm_for_each_vcpu(i, vcpu, kvm)
637 vcpu->arch.pause = true;
638 kvm_make_all_cpus_request(kvm, KVM_REQ_SLEEP);
639}
640
641void kvm_arm_resume_guest(struct kvm *kvm)
642{
643 int i;
644 struct kvm_vcpu *vcpu;
645
646 kvm_for_each_vcpu(i, vcpu, kvm) {
647 vcpu->arch.pause = false;
648 rcuwait_wake_up(kvm_arch_vcpu_get_wait(vcpu));
649 }
650}
651
652static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
653{
654 struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
655
656 rcuwait_wait_event(wait,
657 (!vcpu->arch.power_off) &&(!vcpu->arch.pause),
658 TASK_INTERRUPTIBLE);
659
660 if (vcpu->arch.power_off || vcpu->arch.pause) {
661
662 kvm_make_request(KVM_REQ_SLEEP, vcpu);
663 }
664
665
666
667
668
669
670 smp_rmb();
671}
672
673static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
674{
675 return vcpu->arch.target >= 0;
676}
677
678static void check_vcpu_requests(struct kvm_vcpu *vcpu)
679{
680 if (kvm_request_pending(vcpu)) {
681 if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
682 vcpu_req_sleep(vcpu);
683
684 if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
685 kvm_reset_vcpu(vcpu);
686
687
688
689
690
691 kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
692
693 if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu))
694 kvm_update_stolen_time(vcpu);
695
696 if (kvm_check_request(KVM_REQ_RELOAD_GICv4, vcpu)) {
697
698 preempt_disable();
699 vgic_v4_put(vcpu, false);
700 vgic_v4_load(vcpu);
701 preempt_enable();
702 }
703
704 if (kvm_check_request(KVM_REQ_RELOAD_PMU, vcpu))
705 kvm_pmu_handle_pmcr(vcpu,
706 __vcpu_sys_reg(vcpu, PMCR_EL0));
707 }
708}
709
710static bool vcpu_mode_is_bad_32bit(struct kvm_vcpu *vcpu)
711{
712 if (likely(!vcpu_mode_is_32bit(vcpu)))
713 return false;
714
715 return !system_supports_32bit_el0() ||
716 static_branch_unlikely(&arm64_mismatched_32bit_el0);
717}
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733static bool kvm_vcpu_exit_request(struct kvm_vcpu *vcpu, int *ret)
734{
735 struct kvm_run *run = vcpu->run;
736
737
738
739
740
741
742
743
744 if (static_branch_unlikely(&userspace_irqchip_in_use)) {
745 if (kvm_timer_should_notify_user(vcpu) ||
746 kvm_pmu_should_notify_user(vcpu)) {
747 *ret = -EINTR;
748 run->exit_reason = KVM_EXIT_INTR;
749 return true;
750 }
751 }
752
753 return kvm_request_pending(vcpu) ||
754 need_new_vmid_gen(&vcpu->arch.hw_mmu->vmid) ||
755 xfer_to_guest_mode_work_pending();
756}
757
758
759
760
761
762
763
764
765
766
767
768int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
769{
770 struct kvm_run *run = vcpu->run;
771 int ret;
772
773 if (unlikely(!kvm_vcpu_initialized(vcpu)))
774 return -ENOEXEC;
775
776 ret = kvm_vcpu_first_run_init(vcpu);
777 if (ret)
778 return ret;
779
780 if (run->exit_reason == KVM_EXIT_MMIO) {
781 ret = kvm_handle_mmio_return(vcpu);
782 if (ret)
783 return ret;
784 }
785
786 vcpu_load(vcpu);
787
788 if (run->immediate_exit) {
789 ret = -EINTR;
790 goto out;
791 }
792
793 kvm_sigset_activate(vcpu);
794
795 ret = 1;
796 run->exit_reason = KVM_EXIT_UNKNOWN;
797 while (ret > 0) {
798
799
800
801 ret = xfer_to_guest_mode_handle_work(vcpu);
802 if (!ret)
803 ret = 1;
804
805 update_vmid(&vcpu->arch.hw_mmu->vmid);
806
807 check_vcpu_requests(vcpu);
808
809
810
811
812
813
814 preempt_disable();
815
816 kvm_pmu_flush_hwstate(vcpu);
817
818 local_irq_disable();
819
820 kvm_vgic_flush_hwstate(vcpu);
821
822
823
824
825
826
827
828 smp_store_mb(vcpu->mode, IN_GUEST_MODE);
829
830 if (ret <= 0 || kvm_vcpu_exit_request(vcpu, &ret)) {
831 vcpu->mode = OUTSIDE_GUEST_MODE;
832 isb();
833 kvm_pmu_sync_hwstate(vcpu);
834 if (static_branch_unlikely(&userspace_irqchip_in_use))
835 kvm_timer_sync_user(vcpu);
836 kvm_vgic_sync_hwstate(vcpu);
837 local_irq_enable();
838 preempt_enable();
839 continue;
840 }
841
842 kvm_arm_setup_debug(vcpu);
843
844
845
846
847 trace_kvm_entry(*vcpu_pc(vcpu));
848 guest_enter_irqoff();
849
850 ret = kvm_call_hyp_ret(__kvm_vcpu_run, vcpu);
851
852 vcpu->mode = OUTSIDE_GUEST_MODE;
853 vcpu->stat.exits++;
854
855
856
857
858 kvm_arm_clear_debug(vcpu);
859
860
861
862
863
864
865 kvm_pmu_sync_hwstate(vcpu);
866
867
868
869
870
871
872 kvm_vgic_sync_hwstate(vcpu);
873
874
875
876
877
878
879 if (static_branch_unlikely(&userspace_irqchip_in_use))
880 kvm_timer_sync_user(vcpu);
881
882 kvm_arch_vcpu_ctxsync_fp(vcpu);
883
884
885
886
887
888
889
890
891
892
893
894 local_irq_enable();
895
896
897
898
899
900
901
902
903
904 guest_exit();
905 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
906
907
908 handle_exit_early(vcpu, ret);
909
910 preempt_enable();
911
912
913
914
915
916
917
918
919
920 if (vcpu_mode_is_bad_32bit(vcpu)) {
921
922
923
924
925
926
927 vcpu->arch.target = -1;
928 ret = ARM_EXCEPTION_IL;
929 }
930
931 ret = handle_exit(vcpu, ret);
932 }
933
934
935 if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
936 kvm_timer_update_run(vcpu);
937 kvm_pmu_update_run(vcpu);
938 }
939
940 kvm_sigset_deactivate(vcpu);
941
942out:
943
944
945
946
947
948
949
950 if (unlikely(vcpu->arch.flags & (KVM_ARM64_PENDING_EXCEPTION |
951 KVM_ARM64_INCREMENT_PC)))
952 kvm_call_hyp(__kvm_adjust_pc, vcpu);
953
954 vcpu_put(vcpu);
955 return ret;
956}
957
958static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
959{
960 int bit_index;
961 bool set;
962 unsigned long *hcr;
963
964 if (number == KVM_ARM_IRQ_CPU_IRQ)
965 bit_index = __ffs(HCR_VI);
966 else
967 bit_index = __ffs(HCR_VF);
968
969 hcr = vcpu_hcr(vcpu);
970 if (level)
971 set = test_and_set_bit(bit_index, hcr);
972 else
973 set = test_and_clear_bit(bit_index, hcr);
974
975
976
977
978 if (set == level)
979 return 0;
980
981
982
983
984
985
986 kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
987 kvm_vcpu_kick(vcpu);
988
989 return 0;
990}
991
992int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
993 bool line_status)
994{
995 u32 irq = irq_level->irq;
996 unsigned int irq_type, vcpu_idx, irq_num;
997 int nrcpus = atomic_read(&kvm->online_vcpus);
998 struct kvm_vcpu *vcpu = NULL;
999 bool level = irq_level->level;
1000
1001 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
1002 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
1003 vcpu_idx += ((irq >> KVM_ARM_IRQ_VCPU2_SHIFT) & KVM_ARM_IRQ_VCPU2_MASK) * (KVM_ARM_IRQ_VCPU_MASK + 1);
1004 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
1005
1006 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
1007
1008 switch (irq_type) {
1009 case KVM_ARM_IRQ_TYPE_CPU:
1010 if (irqchip_in_kernel(kvm))
1011 return -ENXIO;
1012
1013 if (vcpu_idx >= nrcpus)
1014 return -EINVAL;
1015
1016 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
1017 if (!vcpu)
1018 return -EINVAL;
1019
1020 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
1021 return -EINVAL;
1022
1023 return vcpu_interrupt_line(vcpu, irq_num, level);
1024 case KVM_ARM_IRQ_TYPE_PPI:
1025 if (!irqchip_in_kernel(kvm))
1026 return -ENXIO;
1027
1028 if (vcpu_idx >= nrcpus)
1029 return -EINVAL;
1030
1031 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
1032 if (!vcpu)
1033 return -EINVAL;
1034
1035 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
1036 return -EINVAL;
1037
1038 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level, NULL);
1039 case KVM_ARM_IRQ_TYPE_SPI:
1040 if (!irqchip_in_kernel(kvm))
1041 return -ENXIO;
1042
1043 if (irq_num < VGIC_NR_PRIVATE_IRQS)
1044 return -EINVAL;
1045
1046 return kvm_vgic_inject_irq(kvm, 0, irq_num, level, NULL);
1047 }
1048
1049 return -EINVAL;
1050}
1051
1052static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
1053 const struct kvm_vcpu_init *init)
1054{
1055 unsigned int i, ret;
1056 u32 phys_target = kvm_target_cpu();
1057
1058 if (init->target != phys_target)
1059 return -EINVAL;
1060
1061
1062
1063
1064
1065 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
1066 return -EINVAL;
1067
1068
1069 for (i = 0; i < sizeof(init->features) * 8; i++) {
1070 bool set = (init->features[i / 32] & (1 << (i % 32)));
1071
1072 if (set && i >= KVM_VCPU_MAX_FEATURES)
1073 return -ENOENT;
1074
1075
1076
1077
1078
1079 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
1080 test_bit(i, vcpu->arch.features) != set)
1081 return -EINVAL;
1082
1083 if (set)
1084 set_bit(i, vcpu->arch.features);
1085 }
1086
1087 vcpu->arch.target = phys_target;
1088
1089
1090 ret = kvm_reset_vcpu(vcpu);
1091 if (ret) {
1092 vcpu->arch.target = -1;
1093 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
1094 }
1095
1096 return ret;
1097}
1098
1099static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
1100 struct kvm_vcpu_init *init)
1101{
1102 int ret;
1103
1104 ret = kvm_vcpu_set_target(vcpu, init);
1105 if (ret)
1106 return ret;
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117 if (vcpu->arch.has_run_once) {
1118 if (!cpus_have_final_cap(ARM64_HAS_STAGE2_FWB))
1119 stage2_unmap_vm(vcpu->kvm);
1120 else
1121 icache_inval_all_pou();
1122 }
1123
1124 vcpu_reset_hcr(vcpu);
1125 vcpu->arch.cptr_el2 = CPTR_EL2_DEFAULT;
1126
1127
1128
1129
1130 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
1131 vcpu_power_off(vcpu);
1132 else
1133 vcpu->arch.power_off = false;
1134
1135 return 0;
1136}
1137
1138static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
1139 struct kvm_device_attr *attr)
1140{
1141 int ret = -ENXIO;
1142
1143 switch (attr->group) {
1144 default:
1145 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
1146 break;
1147 }
1148
1149 return ret;
1150}
1151
1152static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
1153 struct kvm_device_attr *attr)
1154{
1155 int ret = -ENXIO;
1156
1157 switch (attr->group) {
1158 default:
1159 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
1160 break;
1161 }
1162
1163 return ret;
1164}
1165
1166static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
1167 struct kvm_device_attr *attr)
1168{
1169 int ret = -ENXIO;
1170
1171 switch (attr->group) {
1172 default:
1173 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
1174 break;
1175 }
1176
1177 return ret;
1178}
1179
1180static int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
1181 struct kvm_vcpu_events *events)
1182{
1183 memset(events, 0, sizeof(*events));
1184
1185 return __kvm_arm_vcpu_get_events(vcpu, events);
1186}
1187
1188static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
1189 struct kvm_vcpu_events *events)
1190{
1191 int i;
1192
1193
1194 for (i = 0; i < ARRAY_SIZE(events->reserved); i++)
1195 if (events->reserved[i])
1196 return -EINVAL;
1197
1198
1199 for (i = 0; i < ARRAY_SIZE(events->exception.pad); i++)
1200 if (events->exception.pad[i])
1201 return -EINVAL;
1202
1203 return __kvm_arm_vcpu_set_events(vcpu, events);
1204}
1205
1206long kvm_arch_vcpu_ioctl(struct file *filp,
1207 unsigned int ioctl, unsigned long arg)
1208{
1209 struct kvm_vcpu *vcpu = filp->private_data;
1210 void __user *argp = (void __user *)arg;
1211 struct kvm_device_attr attr;
1212 long r;
1213
1214 switch (ioctl) {
1215 case KVM_ARM_VCPU_INIT: {
1216 struct kvm_vcpu_init init;
1217
1218 r = -EFAULT;
1219 if (copy_from_user(&init, argp, sizeof(init)))
1220 break;
1221
1222 r = kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
1223 break;
1224 }
1225 case KVM_SET_ONE_REG:
1226 case KVM_GET_ONE_REG: {
1227 struct kvm_one_reg reg;
1228
1229 r = -ENOEXEC;
1230 if (unlikely(!kvm_vcpu_initialized(vcpu)))
1231 break;
1232
1233 r = -EFAULT;
1234 if (copy_from_user(®, argp, sizeof(reg)))
1235 break;
1236
1237
1238
1239
1240
1241
1242 if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
1243 kvm_reset_vcpu(vcpu);
1244
1245 if (ioctl == KVM_SET_ONE_REG)
1246 r = kvm_arm_set_reg(vcpu, ®);
1247 else
1248 r = kvm_arm_get_reg(vcpu, ®);
1249 break;
1250 }
1251 case KVM_GET_REG_LIST: {
1252 struct kvm_reg_list __user *user_list = argp;
1253 struct kvm_reg_list reg_list;
1254 unsigned n;
1255
1256 r = -ENOEXEC;
1257 if (unlikely(!kvm_vcpu_initialized(vcpu)))
1258 break;
1259
1260 r = -EPERM;
1261 if (!kvm_arm_vcpu_is_finalized(vcpu))
1262 break;
1263
1264 r = -EFAULT;
1265 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
1266 break;
1267 n = reg_list.n;
1268 reg_list.n = kvm_arm_num_regs(vcpu);
1269 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
1270 break;
1271 r = -E2BIG;
1272 if (n < reg_list.n)
1273 break;
1274 r = kvm_arm_copy_reg_indices(vcpu, user_list->reg);
1275 break;
1276 }
1277 case KVM_SET_DEVICE_ATTR: {
1278 r = -EFAULT;
1279 if (copy_from_user(&attr, argp, sizeof(attr)))
1280 break;
1281 r = kvm_arm_vcpu_set_attr(vcpu, &attr);
1282 break;
1283 }
1284 case KVM_GET_DEVICE_ATTR: {
1285 r = -EFAULT;
1286 if (copy_from_user(&attr, argp, sizeof(attr)))
1287 break;
1288 r = kvm_arm_vcpu_get_attr(vcpu, &attr);
1289 break;
1290 }
1291 case KVM_HAS_DEVICE_ATTR: {
1292 r = -EFAULT;
1293 if (copy_from_user(&attr, argp, sizeof(attr)))
1294 break;
1295 r = kvm_arm_vcpu_has_attr(vcpu, &attr);
1296 break;
1297 }
1298 case KVM_GET_VCPU_EVENTS: {
1299 struct kvm_vcpu_events events;
1300
1301 if (kvm_arm_vcpu_get_events(vcpu, &events))
1302 return -EINVAL;
1303
1304 if (copy_to_user(argp, &events, sizeof(events)))
1305 return -EFAULT;
1306
1307 return 0;
1308 }
1309 case KVM_SET_VCPU_EVENTS: {
1310 struct kvm_vcpu_events events;
1311
1312 if (copy_from_user(&events, argp, sizeof(events)))
1313 return -EFAULT;
1314
1315 return kvm_arm_vcpu_set_events(vcpu, &events);
1316 }
1317 case KVM_ARM_VCPU_FINALIZE: {
1318 int what;
1319
1320 if (!kvm_vcpu_initialized(vcpu))
1321 return -ENOEXEC;
1322
1323 if (get_user(what, (const int __user *)argp))
1324 return -EFAULT;
1325
1326 return kvm_arm_vcpu_finalize(vcpu, what);
1327 }
1328 default:
1329 r = -EINVAL;
1330 }
1331
1332 return r;
1333}
1334
1335void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
1336{
1337
1338}
1339
1340void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
1341 const struct kvm_memory_slot *memslot)
1342{
1343 kvm_flush_remote_tlbs(kvm);
1344}
1345
1346static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
1347 struct kvm_arm_device_addr *dev_addr)
1348{
1349 unsigned long dev_id, type;
1350
1351 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
1352 KVM_ARM_DEVICE_ID_SHIFT;
1353 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
1354 KVM_ARM_DEVICE_TYPE_SHIFT;
1355
1356 switch (dev_id) {
1357 case KVM_ARM_DEVICE_VGIC_V2:
1358 if (!vgic_present)
1359 return -ENXIO;
1360 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1361 default:
1362 return -ENODEV;
1363 }
1364}
1365
1366long kvm_arch_vm_ioctl(struct file *filp,
1367 unsigned int ioctl, unsigned long arg)
1368{
1369 struct kvm *kvm = filp->private_data;
1370 void __user *argp = (void __user *)arg;
1371
1372 switch (ioctl) {
1373 case KVM_CREATE_IRQCHIP: {
1374 int ret;
1375 if (!vgic_present)
1376 return -ENXIO;
1377 mutex_lock(&kvm->lock);
1378 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1379 mutex_unlock(&kvm->lock);
1380 return ret;
1381 }
1382 case KVM_ARM_SET_DEVICE_ADDR: {
1383 struct kvm_arm_device_addr dev_addr;
1384
1385 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1386 return -EFAULT;
1387 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1388 }
1389 case KVM_ARM_PREFERRED_TARGET: {
1390 int err;
1391 struct kvm_vcpu_init init;
1392
1393 err = kvm_vcpu_preferred_target(&init);
1394 if (err)
1395 return err;
1396
1397 if (copy_to_user(argp, &init, sizeof(init)))
1398 return -EFAULT;
1399
1400 return 0;
1401 }
1402 case KVM_ARM_MTE_COPY_TAGS: {
1403 struct kvm_arm_copy_mte_tags copy_tags;
1404
1405 if (copy_from_user(©_tags, argp, sizeof(copy_tags)))
1406 return -EFAULT;
1407 return kvm_vm_ioctl_mte_copy_tags(kvm, ©_tags);
1408 }
1409 default:
1410 return -EINVAL;
1411 }
1412}
1413
1414static unsigned long nvhe_percpu_size(void)
1415{
1416 return (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_end) -
1417 (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_start);
1418}
1419
1420static unsigned long nvhe_percpu_order(void)
1421{
1422 unsigned long size = nvhe_percpu_size();
1423
1424 return size ? get_order(size) : 0;
1425}
1426
1427
1428static void *hyp_spectre_vector_selector[BP_HARDEN_EL2_SLOTS];
1429
1430static void kvm_init_vector_slot(void *base, enum arm64_hyp_spectre_vector slot)
1431{
1432 hyp_spectre_vector_selector[slot] = __kvm_vector_slot2addr(base, slot);
1433}
1434
1435static int kvm_init_vector_slots(void)
1436{
1437 int err;
1438 void *base;
1439
1440 base = kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector));
1441 kvm_init_vector_slot(base, HYP_VECTOR_DIRECT);
1442
1443 base = kern_hyp_va(kvm_ksym_ref(__bp_harden_hyp_vecs));
1444 kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_DIRECT);
1445
1446 if (!cpus_have_const_cap(ARM64_SPECTRE_V3A))
1447 return 0;
1448
1449 if (!has_vhe()) {
1450 err = create_hyp_exec_mappings(__pa_symbol(__bp_harden_hyp_vecs),
1451 __BP_HARDEN_HYP_VECS_SZ, &base);
1452 if (err)
1453 return err;
1454 }
1455
1456 kvm_init_vector_slot(base, HYP_VECTOR_INDIRECT);
1457 kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_INDIRECT);
1458 return 0;
1459}
1460
1461static void cpu_prepare_hyp_mode(int cpu)
1462{
1463 struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
1464 unsigned long tcr;
1465
1466
1467
1468
1469
1470
1471
1472 params->tpidr_el2 = (unsigned long)kasan_reset_tag(per_cpu_ptr_nvhe_sym(__per_cpu_start, cpu)) -
1473 (unsigned long)kvm_ksym_ref(CHOOSE_NVHE_SYM(__per_cpu_start));
1474
1475 params->mair_el2 = read_sysreg(mair_el1);
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491 tcr = (read_sysreg(tcr_el1) & TCR_EL2_MASK) | TCR_EL2_RES1;
1492 tcr &= ~TCR_T0SZ_MASK;
1493 tcr |= (idmap_t0sz & GENMASK(TCR_TxSZ_WIDTH - 1, 0)) << TCR_T0SZ_OFFSET;
1494 params->tcr_el2 = tcr;
1495
1496 params->stack_hyp_va = kern_hyp_va(per_cpu(kvm_arm_hyp_stack_page, cpu) + PAGE_SIZE);
1497 params->pgd_pa = kvm_mmu_get_httbr();
1498 if (is_protected_kvm_enabled())
1499 params->hcr_el2 = HCR_HOST_NVHE_PROTECTED_FLAGS;
1500 else
1501 params->hcr_el2 = HCR_HOST_NVHE_FLAGS;
1502 params->vttbr = params->vtcr = 0;
1503
1504
1505
1506
1507
1508 kvm_flush_dcache_to_poc(params, sizeof(*params));
1509}
1510
1511static void hyp_install_host_vector(void)
1512{
1513 struct kvm_nvhe_init_params *params;
1514 struct arm_smccc_res res;
1515
1516
1517 __hyp_set_vectors(kvm_get_idmap_vector());
1518
1519
1520
1521
1522
1523
1524
1525 BUG_ON(!system_capabilities_finalized());
1526 params = this_cpu_ptr_nvhe_sym(kvm_init_params);
1527 arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(__kvm_hyp_init), virt_to_phys(params), &res);
1528 WARN_ON(res.a0 != SMCCC_RET_SUCCESS);
1529}
1530
1531static void cpu_init_hyp_mode(void)
1532{
1533 hyp_install_host_vector();
1534
1535
1536
1537
1538
1539 if (this_cpu_has_cap(ARM64_SSBS) &&
1540 arm64_get_spectre_v4_state() == SPECTRE_VULNERABLE) {
1541 kvm_call_hyp_nvhe(__kvm_enable_ssbs);
1542 }
1543}
1544
1545static void cpu_hyp_reset(void)
1546{
1547 if (!is_kernel_in_hyp_mode())
1548 __hyp_reset_vectors();
1549}
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571static void cpu_set_hyp_vector(void)
1572{
1573 struct bp_hardening_data *data = this_cpu_ptr(&bp_hardening_data);
1574 void *vector = hyp_spectre_vector_selector[data->slot];
1575
1576 if (!is_protected_kvm_enabled())
1577 *this_cpu_ptr_hyp_sym(kvm_hyp_vector) = (unsigned long)vector;
1578 else
1579 kvm_call_hyp_nvhe(__pkvm_cpu_set_vector, data->slot);
1580}
1581
1582static void cpu_hyp_reinit(void)
1583{
1584 kvm_init_host_cpu_context(&this_cpu_ptr_hyp_sym(kvm_host_data)->host_ctxt);
1585
1586 cpu_hyp_reset();
1587
1588 if (is_kernel_in_hyp_mode())
1589 kvm_timer_init_vhe();
1590 else
1591 cpu_init_hyp_mode();
1592
1593 cpu_set_hyp_vector();
1594
1595 kvm_arm_init_debug();
1596
1597 if (vgic_present)
1598 kvm_vgic_init_cpu_hardware();
1599}
1600
1601static void _kvm_arch_hardware_enable(void *discard)
1602{
1603 if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1604 cpu_hyp_reinit();
1605 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1606 }
1607}
1608
1609int kvm_arch_hardware_enable(void)
1610{
1611 _kvm_arch_hardware_enable(NULL);
1612 return 0;
1613}
1614
1615static void _kvm_arch_hardware_disable(void *discard)
1616{
1617 if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1618 cpu_hyp_reset();
1619 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1620 }
1621}
1622
1623void kvm_arch_hardware_disable(void)
1624{
1625 if (!is_protected_kvm_enabled())
1626 _kvm_arch_hardware_disable(NULL);
1627}
1628
1629#ifdef CONFIG_CPU_PM
1630static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1631 unsigned long cmd,
1632 void *v)
1633{
1634
1635
1636
1637
1638
1639 switch (cmd) {
1640 case CPU_PM_ENTER:
1641 if (__this_cpu_read(kvm_arm_hardware_enabled))
1642
1643
1644
1645
1646
1647 cpu_hyp_reset();
1648
1649 return NOTIFY_OK;
1650 case CPU_PM_ENTER_FAILED:
1651 case CPU_PM_EXIT:
1652 if (__this_cpu_read(kvm_arm_hardware_enabled))
1653
1654 cpu_hyp_reinit();
1655
1656 return NOTIFY_OK;
1657
1658 default:
1659 return NOTIFY_DONE;
1660 }
1661}
1662
1663static struct notifier_block hyp_init_cpu_pm_nb = {
1664 .notifier_call = hyp_init_cpu_pm_notifier,
1665};
1666
1667static void hyp_cpu_pm_init(void)
1668{
1669 if (!is_protected_kvm_enabled())
1670 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1671}
1672static void hyp_cpu_pm_exit(void)
1673{
1674 if (!is_protected_kvm_enabled())
1675 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1676}
1677#else
1678static inline void hyp_cpu_pm_init(void)
1679{
1680}
1681static inline void hyp_cpu_pm_exit(void)
1682{
1683}
1684#endif
1685
1686static void init_cpu_logical_map(void)
1687{
1688 unsigned int cpu;
1689
1690
1691
1692
1693
1694
1695
1696 for_each_online_cpu(cpu)
1697 hyp_cpu_logical_map[cpu] = cpu_logical_map(cpu);
1698}
1699
1700#define init_psci_0_1_impl_state(config, what) \
1701 config.psci_0_1_ ## what ## _implemented = psci_ops.what
1702
1703static bool init_psci_relay(void)
1704{
1705
1706
1707
1708
1709 if (!psci_ops.get_version) {
1710 kvm_err("Cannot initialize protected mode without PSCI\n");
1711 return false;
1712 }
1713
1714 kvm_host_psci_config.version = psci_ops.get_version();
1715
1716 if (kvm_host_psci_config.version == PSCI_VERSION(0, 1)) {
1717 kvm_host_psci_config.function_ids_0_1 = get_psci_0_1_function_ids();
1718 init_psci_0_1_impl_state(kvm_host_psci_config, cpu_suspend);
1719 init_psci_0_1_impl_state(kvm_host_psci_config, cpu_on);
1720 init_psci_0_1_impl_state(kvm_host_psci_config, cpu_off);
1721 init_psci_0_1_impl_state(kvm_host_psci_config, migrate);
1722 }
1723 return true;
1724}
1725
1726static int init_subsystems(void)
1727{
1728 int err = 0;
1729
1730
1731
1732
1733 on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1734
1735
1736
1737
1738 hyp_cpu_pm_init();
1739
1740
1741
1742
1743 err = kvm_vgic_hyp_init();
1744 switch (err) {
1745 case 0:
1746 vgic_present = true;
1747 break;
1748 case -ENODEV:
1749 case -ENXIO:
1750 vgic_present = false;
1751 err = 0;
1752 break;
1753 default:
1754 goto out;
1755 }
1756
1757
1758
1759
1760 err = kvm_timer_hyp_init(vgic_present);
1761 if (err)
1762 goto out;
1763
1764 kvm_perf_init();
1765 kvm_sys_reg_table_init();
1766
1767out:
1768 if (err || !is_protected_kvm_enabled())
1769 on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1770
1771 return err;
1772}
1773
1774static void teardown_hyp_mode(void)
1775{
1776 int cpu;
1777
1778 free_hyp_pgds();
1779 for_each_possible_cpu(cpu) {
1780 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1781 free_pages(kvm_arm_hyp_percpu_base[cpu], nvhe_percpu_order());
1782 }
1783}
1784
1785static int do_pkvm_init(u32 hyp_va_bits)
1786{
1787 void *per_cpu_base = kvm_ksym_ref(kvm_arm_hyp_percpu_base);
1788 int ret;
1789
1790 preempt_disable();
1791 hyp_install_host_vector();
1792 ret = kvm_call_hyp_nvhe(__pkvm_init, hyp_mem_base, hyp_mem_size,
1793 num_possible_cpus(), kern_hyp_va(per_cpu_base),
1794 hyp_va_bits);
1795 preempt_enable();
1796
1797 return ret;
1798}
1799
1800static int kvm_hyp_init_protection(u32 hyp_va_bits)
1801{
1802 void *addr = phys_to_virt(hyp_mem_base);
1803 int ret;
1804
1805 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
1806 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
1807
1808 ret = create_hyp_mappings(addr, addr + hyp_mem_size, PAGE_HYP);
1809 if (ret)
1810 return ret;
1811
1812 ret = do_pkvm_init(hyp_va_bits);
1813 if (ret)
1814 return ret;
1815
1816 free_hyp_pgds();
1817
1818 return 0;
1819}
1820
1821
1822
1823
1824static int init_hyp_mode(void)
1825{
1826 u32 hyp_va_bits;
1827 int cpu;
1828 int err = -ENOMEM;
1829
1830
1831
1832
1833
1834 if (is_protected_kvm_enabled() && !hyp_mem_base)
1835 goto out_err;
1836
1837
1838
1839
1840 err = kvm_mmu_init(&hyp_va_bits);
1841 if (err)
1842 goto out_err;
1843
1844
1845
1846
1847 for_each_possible_cpu(cpu) {
1848 unsigned long stack_page;
1849
1850 stack_page = __get_free_page(GFP_KERNEL);
1851 if (!stack_page) {
1852 err = -ENOMEM;
1853 goto out_err;
1854 }
1855
1856 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1857 }
1858
1859
1860
1861
1862 for_each_possible_cpu(cpu) {
1863 struct page *page;
1864 void *page_addr;
1865
1866 page = alloc_pages(GFP_KERNEL, nvhe_percpu_order());
1867 if (!page) {
1868 err = -ENOMEM;
1869 goto out_err;
1870 }
1871
1872 page_addr = page_address(page);
1873 memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size());
1874 kvm_arm_hyp_percpu_base[cpu] = (unsigned long)page_addr;
1875 }
1876
1877
1878
1879
1880 err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1881 kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1882 if (err) {
1883 kvm_err("Cannot map world-switch code\n");
1884 goto out_err;
1885 }
1886
1887 err = create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start),
1888 kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO);
1889 if (err) {
1890 kvm_err("Cannot map .hyp.rodata section\n");
1891 goto out_err;
1892 }
1893
1894 err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1895 kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1896 if (err) {
1897 kvm_err("Cannot map rodata section\n");
1898 goto out_err;
1899 }
1900
1901
1902
1903
1904
1905
1906 err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_start),
1907 kvm_ksym_ref(__hyp_bss_end), PAGE_HYP);
1908 if (err) {
1909 kvm_err("Cannot map hyp bss section: %d\n", err);
1910 goto out_err;
1911 }
1912
1913 err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_end),
1914 kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
1915 if (err) {
1916 kvm_err("Cannot map bss section\n");
1917 goto out_err;
1918 }
1919
1920
1921
1922
1923 for_each_possible_cpu(cpu) {
1924 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1925 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1926 PAGE_HYP);
1927
1928 if (err) {
1929 kvm_err("Cannot map hyp stack\n");
1930 goto out_err;
1931 }
1932 }
1933
1934 for_each_possible_cpu(cpu) {
1935 char *percpu_begin = (char *)kvm_arm_hyp_percpu_base[cpu];
1936 char *percpu_end = percpu_begin + nvhe_percpu_size();
1937
1938
1939 err = create_hyp_mappings(percpu_begin, percpu_end, PAGE_HYP);
1940 if (err) {
1941 kvm_err("Cannot map hyp percpu region\n");
1942 goto out_err;
1943 }
1944
1945
1946 cpu_prepare_hyp_mode(cpu);
1947 }
1948
1949 if (is_protected_kvm_enabled()) {
1950 init_cpu_logical_map();
1951
1952 if (!init_psci_relay()) {
1953 err = -ENODEV;
1954 goto out_err;
1955 }
1956 }
1957
1958 if (is_protected_kvm_enabled()) {
1959 err = kvm_hyp_init_protection(hyp_va_bits);
1960 if (err) {
1961 kvm_err("Failed to init hyp memory protection\n");
1962 goto out_err;
1963 }
1964 }
1965
1966 return 0;
1967
1968out_err:
1969 teardown_hyp_mode();
1970 kvm_err("error initializing Hyp mode: %d\n", err);
1971 return err;
1972}
1973
1974static void _kvm_host_prot_finalize(void *discard)
1975{
1976 WARN_ON(kvm_call_hyp_nvhe(__pkvm_prot_finalize));
1977}
1978
1979static int finalize_hyp_mode(void)
1980{
1981 if (!is_protected_kvm_enabled())
1982 return 0;
1983
1984
1985
1986
1987
1988
1989 kmemleak_free_part(__hyp_bss_start, __hyp_bss_end - __hyp_bss_start);
1990
1991
1992
1993
1994
1995 static_branch_enable(&kvm_protected_mode_initialized);
1996 on_each_cpu(_kvm_host_prot_finalize, NULL, 1);
1997
1998 return 0;
1999}
2000
2001struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
2002{
2003 struct kvm_vcpu *vcpu;
2004 int i;
2005
2006 mpidr &= MPIDR_HWID_BITMASK;
2007 kvm_for_each_vcpu(i, vcpu, kvm) {
2008 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
2009 return vcpu;
2010 }
2011 return NULL;
2012}
2013
2014bool kvm_arch_has_irq_bypass(void)
2015{
2016 return true;
2017}
2018
2019int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
2020 struct irq_bypass_producer *prod)
2021{
2022 struct kvm_kernel_irqfd *irqfd =
2023 container_of(cons, struct kvm_kernel_irqfd, consumer);
2024
2025 return kvm_vgic_v4_set_forwarding(irqfd->kvm, prod->irq,
2026 &irqfd->irq_entry);
2027}
2028void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
2029 struct irq_bypass_producer *prod)
2030{
2031 struct kvm_kernel_irqfd *irqfd =
2032 container_of(cons, struct kvm_kernel_irqfd, consumer);
2033
2034 kvm_vgic_v4_unset_forwarding(irqfd->kvm, prod->irq,
2035 &irqfd->irq_entry);
2036}
2037
2038void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
2039{
2040 struct kvm_kernel_irqfd *irqfd =
2041 container_of(cons, struct kvm_kernel_irqfd, consumer);
2042
2043 kvm_arm_halt_guest(irqfd->kvm);
2044}
2045
2046void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
2047{
2048 struct kvm_kernel_irqfd *irqfd =
2049 container_of(cons, struct kvm_kernel_irqfd, consumer);
2050
2051 kvm_arm_resume_guest(irqfd->kvm);
2052}
2053
2054
2055
2056
2057int kvm_arch_init(void *opaque)
2058{
2059 int err;
2060 bool in_hyp_mode;
2061
2062 if (!is_hyp_mode_available()) {
2063 kvm_info("HYP mode not available\n");
2064 return -ENODEV;
2065 }
2066
2067 in_hyp_mode = is_kernel_in_hyp_mode();
2068
2069 if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) ||
2070 cpus_have_final_cap(ARM64_WORKAROUND_1508412))
2071 kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \
2072 "Only trusted guests should be used on this system.\n");
2073
2074 err = kvm_set_ipa_limit();
2075 if (err)
2076 return err;
2077
2078 err = kvm_arm_init_sve();
2079 if (err)
2080 return err;
2081
2082 if (!in_hyp_mode) {
2083 err = init_hyp_mode();
2084 if (err)
2085 goto out_err;
2086 }
2087
2088 err = kvm_init_vector_slots();
2089 if (err) {
2090 kvm_err("Cannot initialise vector slots\n");
2091 goto out_err;
2092 }
2093
2094 err = init_subsystems();
2095 if (err)
2096 goto out_hyp;
2097
2098 if (!in_hyp_mode) {
2099 err = finalize_hyp_mode();
2100 if (err) {
2101 kvm_err("Failed to finalize Hyp protection\n");
2102 goto out_hyp;
2103 }
2104 }
2105
2106 if (is_protected_kvm_enabled()) {
2107 kvm_info("Protected nVHE mode initialized successfully\n");
2108 } else if (in_hyp_mode) {
2109 kvm_info("VHE mode initialized successfully\n");
2110 } else {
2111 kvm_info("Hyp mode initialized successfully\n");
2112 }
2113
2114 return 0;
2115
2116out_hyp:
2117 hyp_cpu_pm_exit();
2118 if (!in_hyp_mode)
2119 teardown_hyp_mode();
2120out_err:
2121 return err;
2122}
2123
2124
2125void kvm_arch_exit(void)
2126{
2127 kvm_perf_teardown();
2128}
2129
2130static int __init early_kvm_mode_cfg(char *arg)
2131{
2132 if (!arg)
2133 return -EINVAL;
2134
2135 if (strcmp(arg, "protected") == 0) {
2136 kvm_mode = KVM_MODE_PROTECTED;
2137 return 0;
2138 }
2139
2140 if (strcmp(arg, "nvhe") == 0 && !WARN_ON(is_kernel_in_hyp_mode()))
2141 return 0;
2142
2143 return -EINVAL;
2144}
2145early_param("kvm-arm.mode", early_kvm_mode_cfg);
2146
2147enum kvm_mode kvm_get_mode(void)
2148{
2149 return kvm_mode;
2150}
2151
2152static int arm_init(void)
2153{
2154 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
2155 return rc;
2156}
2157
2158module_init(arm_init);
2159