1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
4 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
5 */
6
7 #include <linux/bug.h>
8 #include <linux/cpu_pm.h>
9 #include <linux/errno.h>
10 #include <linux/err.h>
11 #include <linux/kvm_host.h>
12 #include <linux/list.h>
13 #include <linux/module.h>
14 #include <linux/vmalloc.h>
15 #include <linux/fs.h>
16 #include <linux/mman.h>
17 #include <linux/sched.h>
18 #include <linux/kvm.h>
19 #include <linux/kvm_irqfd.h>
20 #include <linux/irqbypass.h>
21 #include <linux/sched/stat.h>
22 #include <linux/psci.h>
23 #include <trace/events/kvm.h>
24
25 #define CREATE_TRACE_POINTS
26 #include "trace_arm.h"
27
28 #include <linux/uaccess.h>
29 #include <asm/ptrace.h>
30 #include <asm/mman.h>
31 #include <asm/tlbflush.h>
32 #include <asm/cacheflush.h>
33 #include <asm/cpufeature.h>
34 #include <asm/virt.h>
35 #include <asm/kvm_arm.h>
36 #include <asm/kvm_asm.h>
37 #include <asm/kvm_mmu.h>
38 #include <asm/kvm_emulate.h>
39 #include <asm/sections.h>
40
41 #include <kvm/arm_hypercalls.h>
42 #include <kvm/arm_pmu.h>
43 #include <kvm/arm_psci.h>
44
45 #ifdef REQUIRES_VIRT
46 __asm__(".arch_extension virt");
47 #endif
48
49 static enum kvm_mode kvm_mode = KVM_MODE_DEFAULT;
50 DEFINE_STATIC_KEY_FALSE(kvm_protected_mode_initialized);
51
52 DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector);
53
54 static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page);
55 unsigned long kvm_arm_hyp_percpu_base[NR_CPUS];
56 DECLARE_KVM_NVHE_PER_CPU(struct kvm_nvhe_init_params, kvm_init_params);
57
58 /* The VMID used in the VTTBR */
59 static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1);
60 static u32 kvm_next_vmid;
61 static DEFINE_SPINLOCK(kvm_vmid_lock);
62
63 static bool vgic_present;
64
65 static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
66 DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
67
kvm_arch_vcpu_should_kick(struct kvm_vcpu * vcpu)68 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
69 {
70 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
71 }
72
kvm_arch_hardware_setup(void * opaque)73 int kvm_arch_hardware_setup(void *opaque)
74 {
75 return 0;
76 }
77
kvm_arch_check_processor_compat(void * opaque)78 int kvm_arch_check_processor_compat(void *opaque)
79 {
80 return 0;
81 }
82
kvm_vm_ioctl_enable_cap(struct kvm * kvm,struct kvm_enable_cap * cap)83 int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
84 struct kvm_enable_cap *cap)
85 {
86 int r;
87
88 if (cap->flags)
89 return -EINVAL;
90
91 switch (cap->cap) {
92 case KVM_CAP_ARM_NISV_TO_USER:
93 r = 0;
94 kvm->arch.return_nisv_io_abort_to_user = true;
95 break;
96 default:
97 r = -EINVAL;
98 break;
99 }
100
101 return r;
102 }
103
kvm_arm_default_max_vcpus(void)104 static int kvm_arm_default_max_vcpus(void)
105 {
106 return vgic_present ? kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
107 }
108
set_default_spectre(struct kvm * kvm)109 static void set_default_spectre(struct kvm *kvm)
110 {
111 /*
112 * The default is to expose CSV2 == 1 if the HW isn't affected.
113 * Although this is a per-CPU feature, we make it global because
114 * asymmetric systems are just a nuisance.
115 *
116 * Userspace can override this as long as it doesn't promise
117 * the impossible.
118 */
119 if (arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED)
120 kvm->arch.pfr0_csv2 = 1;
121 if (arm64_get_meltdown_state() == SPECTRE_UNAFFECTED)
122 kvm->arch.pfr0_csv3 = 1;
123 }
124
125 /**
126 * kvm_arch_init_vm - initializes a VM data structure
127 * @kvm: pointer to the KVM struct
128 */
kvm_arch_init_vm(struct kvm * kvm,unsigned long type)129 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
130 {
131 int ret;
132
133 ret = kvm_arm_setup_stage2(kvm, type);
134 if (ret)
135 return ret;
136
137 ret = kvm_init_stage2_mmu(kvm, &kvm->arch.mmu);
138 if (ret)
139 return ret;
140
141 ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP);
142 if (ret)
143 goto out_free_stage2_pgd;
144
145 kvm_vgic_early_init(kvm);
146
147 /* The maximum number of VCPUs is limited by the host's GIC model */
148 kvm->arch.max_vcpus = kvm_arm_default_max_vcpus();
149
150 set_default_spectre(kvm);
151
152 return ret;
153 out_free_stage2_pgd:
154 kvm_free_stage2_pgd(&kvm->arch.mmu);
155 return ret;
156 }
157
kvm_arch_vcpu_fault(struct kvm_vcpu * vcpu,struct vm_fault * vmf)158 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
159 {
160 return VM_FAULT_SIGBUS;
161 }
162
163
164 /**
165 * kvm_arch_destroy_vm - destroy the VM data structure
166 * @kvm: pointer to the KVM struct
167 */
kvm_arch_destroy_vm(struct kvm * kvm)168 void kvm_arch_destroy_vm(struct kvm *kvm)
169 {
170 int i;
171
172 bitmap_free(kvm->arch.pmu_filter);
173
174 kvm_vgic_destroy(kvm);
175
176 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
177 if (kvm->vcpus[i]) {
178 kvm_vcpu_destroy(kvm->vcpus[i]);
179 kvm->vcpus[i] = NULL;
180 }
181 }
182 atomic_set(&kvm->online_vcpus, 0);
183 }
184
kvm_vm_ioctl_check_extension(struct kvm * kvm,long ext)185 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
186 {
187 int r;
188 switch (ext) {
189 case KVM_CAP_IRQCHIP:
190 r = vgic_present;
191 break;
192 case KVM_CAP_IOEVENTFD:
193 case KVM_CAP_DEVICE_CTRL:
194 case KVM_CAP_USER_MEMORY:
195 case KVM_CAP_SYNC_MMU:
196 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
197 case KVM_CAP_ONE_REG:
198 case KVM_CAP_ARM_PSCI:
199 case KVM_CAP_ARM_PSCI_0_2:
200 case KVM_CAP_READONLY_MEM:
201 case KVM_CAP_MP_STATE:
202 case KVM_CAP_IMMEDIATE_EXIT:
203 case KVM_CAP_VCPU_EVENTS:
204 case KVM_CAP_ARM_IRQ_LINE_LAYOUT_2:
205 case KVM_CAP_ARM_NISV_TO_USER:
206 case KVM_CAP_ARM_INJECT_EXT_DABT:
207 case KVM_CAP_SET_GUEST_DEBUG:
208 case KVM_CAP_VCPU_ATTRIBUTES:
209 case KVM_CAP_PTP_KVM:
210 r = 1;
211 break;
212 case KVM_CAP_SET_GUEST_DEBUG2:
213 return KVM_GUESTDBG_VALID_MASK;
214 case KVM_CAP_ARM_SET_DEVICE_ADDR:
215 r = 1;
216 break;
217 case KVM_CAP_NR_VCPUS:
218 r = num_online_cpus();
219 break;
220 case KVM_CAP_MAX_VCPUS:
221 case KVM_CAP_MAX_VCPU_ID:
222 if (kvm)
223 r = kvm->arch.max_vcpus;
224 else
225 r = kvm_arm_default_max_vcpus();
226 break;
227 case KVM_CAP_MSI_DEVID:
228 if (!kvm)
229 r = -EINVAL;
230 else
231 r = kvm->arch.vgic.msis_require_devid;
232 break;
233 case KVM_CAP_ARM_USER_IRQ:
234 /*
235 * 1: EL1_VTIMER, EL1_PTIMER, and PMU.
236 * (bump this number if adding more devices)
237 */
238 r = 1;
239 break;
240 case KVM_CAP_STEAL_TIME:
241 r = kvm_arm_pvtime_supported();
242 break;
243 case KVM_CAP_ARM_EL1_32BIT:
244 r = cpus_have_const_cap(ARM64_HAS_32BIT_EL1);
245 break;
246 case KVM_CAP_GUEST_DEBUG_HW_BPS:
247 r = get_num_brps();
248 break;
249 case KVM_CAP_GUEST_DEBUG_HW_WPS:
250 r = get_num_wrps();
251 break;
252 case KVM_CAP_ARM_PMU_V3:
253 r = kvm_arm_support_pmu_v3();
254 break;
255 case KVM_CAP_ARM_INJECT_SERROR_ESR:
256 r = cpus_have_const_cap(ARM64_HAS_RAS_EXTN);
257 break;
258 case KVM_CAP_ARM_VM_IPA_SIZE:
259 r = get_kvm_ipa_limit();
260 break;
261 case KVM_CAP_ARM_SVE:
262 r = system_supports_sve();
263 break;
264 case KVM_CAP_ARM_PTRAUTH_ADDRESS:
265 case KVM_CAP_ARM_PTRAUTH_GENERIC:
266 r = system_has_full_ptr_auth();
267 break;
268 default:
269 r = 0;
270 }
271
272 return r;
273 }
274
kvm_arch_dev_ioctl(struct file * filp,unsigned int ioctl,unsigned long arg)275 long kvm_arch_dev_ioctl(struct file *filp,
276 unsigned int ioctl, unsigned long arg)
277 {
278 return -EINVAL;
279 }
280
kvm_arch_alloc_vm(void)281 struct kvm *kvm_arch_alloc_vm(void)
282 {
283 if (!has_vhe())
284 return kzalloc(sizeof(struct kvm), GFP_KERNEL);
285
286 return vzalloc(sizeof(struct kvm));
287 }
288
kvm_arch_free_vm(struct kvm * kvm)289 void kvm_arch_free_vm(struct kvm *kvm)
290 {
291 if (!has_vhe())
292 kfree(kvm);
293 else
294 vfree(kvm);
295 }
296
kvm_arch_vcpu_precreate(struct kvm * kvm,unsigned int id)297 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
298 {
299 if (irqchip_in_kernel(kvm) && vgic_initialized(kvm))
300 return -EBUSY;
301
302 if (id >= kvm->arch.max_vcpus)
303 return -EINVAL;
304
305 return 0;
306 }
307
kvm_arch_vcpu_create(struct kvm_vcpu * vcpu)308 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
309 {
310 int err;
311
312 /* Force users to call KVM_ARM_VCPU_INIT */
313 vcpu->arch.target = -1;
314 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
315
316 vcpu->arch.mmu_page_cache.gfp_zero = __GFP_ZERO;
317
318 /* Set up the timer */
319 kvm_timer_vcpu_init(vcpu);
320
321 kvm_pmu_vcpu_init(vcpu);
322
323 kvm_arm_reset_debug_ptr(vcpu);
324
325 kvm_arm_pvtime_vcpu_init(&vcpu->arch);
326
327 vcpu->arch.hw_mmu = &vcpu->kvm->arch.mmu;
328
329 err = kvm_vgic_vcpu_init(vcpu);
330 if (err)
331 return err;
332
333 return create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP);
334 }
335
kvm_arch_vcpu_postcreate(struct kvm_vcpu * vcpu)336 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
337 {
338 }
339
kvm_arch_vcpu_destroy(struct kvm_vcpu * vcpu)340 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
341 {
342 if (vcpu->arch.has_run_once && unlikely(!irqchip_in_kernel(vcpu->kvm)))
343 static_branch_dec(&userspace_irqchip_in_use);
344
345 kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
346 kvm_timer_vcpu_terminate(vcpu);
347 kvm_pmu_vcpu_destroy(vcpu);
348
349 kvm_arm_vcpu_destroy(vcpu);
350 }
351
kvm_cpu_has_pending_timer(struct kvm_vcpu * vcpu)352 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
353 {
354 return kvm_timer_is_pending(vcpu);
355 }
356
kvm_arch_vcpu_blocking(struct kvm_vcpu * vcpu)357 void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu)
358 {
359 /*
360 * If we're about to block (most likely because we've just hit a
361 * WFI), we need to sync back the state of the GIC CPU interface
362 * so that we have the latest PMR and group enables. This ensures
363 * that kvm_arch_vcpu_runnable has up-to-date data to decide
364 * whether we have pending interrupts.
365 *
366 * For the same reason, we want to tell GICv4 that we need
367 * doorbells to be signalled, should an interrupt become pending.
368 */
369 preempt_disable();
370 kvm_vgic_vmcr_sync(vcpu);
371 vgic_v4_put(vcpu, true);
372 preempt_enable();
373 }
374
kvm_arch_vcpu_unblocking(struct kvm_vcpu * vcpu)375 void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu)
376 {
377 preempt_disable();
378 vgic_v4_load(vcpu);
379 preempt_enable();
380 }
381
kvm_arch_vcpu_load(struct kvm_vcpu * vcpu,int cpu)382 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
383 {
384 struct kvm_s2_mmu *mmu;
385 int *last_ran;
386
387 mmu = vcpu->arch.hw_mmu;
388 last_ran = this_cpu_ptr(mmu->last_vcpu_ran);
389
390 /*
391 * We guarantee that both TLBs and I-cache are private to each
392 * vcpu. If detecting that a vcpu from the same VM has
393 * previously run on the same physical CPU, call into the
394 * hypervisor code to nuke the relevant contexts.
395 *
396 * We might get preempted before the vCPU actually runs, but
397 * over-invalidation doesn't affect correctness.
398 */
399 if (*last_ran != vcpu->vcpu_id) {
400 kvm_call_hyp(__kvm_flush_cpu_context, mmu);
401 *last_ran = vcpu->vcpu_id;
402 }
403
404 vcpu->cpu = cpu;
405
406 kvm_vgic_load(vcpu);
407 kvm_timer_vcpu_load(vcpu);
408 if (has_vhe())
409 kvm_vcpu_load_sysregs_vhe(vcpu);
410 kvm_arch_vcpu_load_fp(vcpu);
411 kvm_vcpu_pmu_restore_guest(vcpu);
412 if (kvm_arm_is_pvtime_enabled(&vcpu->arch))
413 kvm_make_request(KVM_REQ_RECORD_STEAL, vcpu);
414
415 if (single_task_running())
416 vcpu_clear_wfx_traps(vcpu);
417 else
418 vcpu_set_wfx_traps(vcpu);
419
420 if (vcpu_has_ptrauth(vcpu))
421 vcpu_ptrauth_disable(vcpu);
422 kvm_arch_vcpu_load_debug_state_flags(vcpu);
423 }
424
kvm_arch_vcpu_put(struct kvm_vcpu * vcpu)425 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
426 {
427 kvm_arch_vcpu_put_debug_state_flags(vcpu);
428 kvm_arch_vcpu_put_fp(vcpu);
429 if (has_vhe())
430 kvm_vcpu_put_sysregs_vhe(vcpu);
431 kvm_timer_vcpu_put(vcpu);
432 kvm_vgic_put(vcpu);
433 kvm_vcpu_pmu_restore_host(vcpu);
434
435 vcpu->cpu = -1;
436 }
437
vcpu_power_off(struct kvm_vcpu * vcpu)438 static void vcpu_power_off(struct kvm_vcpu *vcpu)
439 {
440 vcpu->arch.power_off = true;
441 kvm_make_request(KVM_REQ_SLEEP, vcpu);
442 kvm_vcpu_kick(vcpu);
443 }
444
kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu * vcpu,struct kvm_mp_state * mp_state)445 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
446 struct kvm_mp_state *mp_state)
447 {
448 if (vcpu->arch.power_off)
449 mp_state->mp_state = KVM_MP_STATE_STOPPED;
450 else
451 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
452
453 return 0;
454 }
455
kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu * vcpu,struct kvm_mp_state * mp_state)456 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
457 struct kvm_mp_state *mp_state)
458 {
459 int ret = 0;
460
461 switch (mp_state->mp_state) {
462 case KVM_MP_STATE_RUNNABLE:
463 vcpu->arch.power_off = false;
464 break;
465 case KVM_MP_STATE_STOPPED:
466 vcpu_power_off(vcpu);
467 break;
468 default:
469 ret = -EINVAL;
470 }
471
472 return ret;
473 }
474
475 /**
476 * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled
477 * @v: The VCPU pointer
478 *
479 * If the guest CPU is not waiting for interrupts or an interrupt line is
480 * asserted, the CPU is by definition runnable.
481 */
kvm_arch_vcpu_runnable(struct kvm_vcpu * v)482 int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
483 {
484 bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
485 return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
486 && !v->arch.power_off && !v->arch.pause);
487 }
488
kvm_arch_vcpu_in_kernel(struct kvm_vcpu * vcpu)489 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
490 {
491 return vcpu_mode_priv(vcpu);
492 }
493
494 /* Just ensure a guest exit from a particular CPU */
exit_vm_noop(void * info)495 static void exit_vm_noop(void *info)
496 {
497 }
498
force_vm_exit(const cpumask_t * mask)499 void force_vm_exit(const cpumask_t *mask)
500 {
501 preempt_disable();
502 smp_call_function_many(mask, exit_vm_noop, NULL, true);
503 preempt_enable();
504 }
505
506 /**
507 * need_new_vmid_gen - check that the VMID is still valid
508 * @vmid: The VMID to check
509 *
510 * return true if there is a new generation of VMIDs being used
511 *
512 * The hardware supports a limited set of values with the value zero reserved
513 * for the host, so we check if an assigned value belongs to a previous
514 * generation, which requires us to assign a new value. If we're the first to
515 * use a VMID for the new generation, we must flush necessary caches and TLBs
516 * on all CPUs.
517 */
need_new_vmid_gen(struct kvm_vmid * vmid)518 static bool need_new_vmid_gen(struct kvm_vmid *vmid)
519 {
520 u64 current_vmid_gen = atomic64_read(&kvm_vmid_gen);
521 smp_rmb(); /* Orders read of kvm_vmid_gen and kvm->arch.vmid */
522 return unlikely(READ_ONCE(vmid->vmid_gen) != current_vmid_gen);
523 }
524
525 /**
526 * update_vmid - Update the vmid with a valid VMID for the current generation
527 * @vmid: The stage-2 VMID information struct
528 */
update_vmid(struct kvm_vmid * vmid)529 static void update_vmid(struct kvm_vmid *vmid)
530 {
531 if (!need_new_vmid_gen(vmid))
532 return;
533
534 spin_lock(&kvm_vmid_lock);
535
536 /*
537 * We need to re-check the vmid_gen here to ensure that if another vcpu
538 * already allocated a valid vmid for this vm, then this vcpu should
539 * use the same vmid.
540 */
541 if (!need_new_vmid_gen(vmid)) {
542 spin_unlock(&kvm_vmid_lock);
543 return;
544 }
545
546 /* First user of a new VMID generation? */
547 if (unlikely(kvm_next_vmid == 0)) {
548 atomic64_inc(&kvm_vmid_gen);
549 kvm_next_vmid = 1;
550
551 /*
552 * On SMP we know no other CPUs can use this CPU's or each
553 * other's VMID after force_vm_exit returns since the
554 * kvm_vmid_lock blocks them from reentry to the guest.
555 */
556 force_vm_exit(cpu_all_mask);
557 /*
558 * Now broadcast TLB + ICACHE invalidation over the inner
559 * shareable domain to make sure all data structures are
560 * clean.
561 */
562 kvm_call_hyp(__kvm_flush_vm_context);
563 }
564
565 vmid->vmid = kvm_next_vmid;
566 kvm_next_vmid++;
567 kvm_next_vmid &= (1 << kvm_get_vmid_bits()) - 1;
568
569 smp_wmb();
570 WRITE_ONCE(vmid->vmid_gen, atomic64_read(&kvm_vmid_gen));
571
572 spin_unlock(&kvm_vmid_lock);
573 }
574
kvm_vcpu_first_run_init(struct kvm_vcpu * vcpu)575 static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
576 {
577 struct kvm *kvm = vcpu->kvm;
578 int ret = 0;
579
580 if (likely(vcpu->arch.has_run_once))
581 return 0;
582
583 if (!kvm_arm_vcpu_is_finalized(vcpu))
584 return -EPERM;
585
586 vcpu->arch.has_run_once = true;
587
588 kvm_arm_vcpu_init_debug(vcpu);
589
590 if (likely(irqchip_in_kernel(kvm))) {
591 /*
592 * Map the VGIC hardware resources before running a vcpu the
593 * first time on this VM.
594 */
595 ret = kvm_vgic_map_resources(kvm);
596 if (ret)
597 return ret;
598 } else {
599 /*
600 * Tell the rest of the code that there are userspace irqchip
601 * VMs in the wild.
602 */
603 static_branch_inc(&userspace_irqchip_in_use);
604 }
605
606 ret = kvm_timer_enable(vcpu);
607 if (ret)
608 return ret;
609
610 ret = kvm_arm_pmu_v3_enable(vcpu);
611
612 return ret;
613 }
614
kvm_arch_intc_initialized(struct kvm * kvm)615 bool kvm_arch_intc_initialized(struct kvm *kvm)
616 {
617 return vgic_initialized(kvm);
618 }
619
kvm_arm_halt_guest(struct kvm * kvm)620 void kvm_arm_halt_guest(struct kvm *kvm)
621 {
622 int i;
623 struct kvm_vcpu *vcpu;
624
625 kvm_for_each_vcpu(i, vcpu, kvm)
626 vcpu->arch.pause = true;
627 kvm_make_all_cpus_request(kvm, KVM_REQ_SLEEP);
628 }
629
kvm_arm_resume_guest(struct kvm * kvm)630 void kvm_arm_resume_guest(struct kvm *kvm)
631 {
632 int i;
633 struct kvm_vcpu *vcpu;
634
635 kvm_for_each_vcpu(i, vcpu, kvm) {
636 vcpu->arch.pause = false;
637 rcuwait_wake_up(kvm_arch_vcpu_get_wait(vcpu));
638 }
639 }
640
vcpu_req_sleep(struct kvm_vcpu * vcpu)641 static void vcpu_req_sleep(struct kvm_vcpu *vcpu)
642 {
643 struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
644
645 rcuwait_wait_event(wait,
646 (!vcpu->arch.power_off) &&(!vcpu->arch.pause),
647 TASK_INTERRUPTIBLE);
648
649 if (vcpu->arch.power_off || vcpu->arch.pause) {
650 /* Awaken to handle a signal, request we sleep again later. */
651 kvm_make_request(KVM_REQ_SLEEP, vcpu);
652 }
653
654 /*
655 * Make sure we will observe a potential reset request if we've
656 * observed a change to the power state. Pairs with the smp_wmb() in
657 * kvm_psci_vcpu_on().
658 */
659 smp_rmb();
660 }
661
kvm_vcpu_initialized(struct kvm_vcpu * vcpu)662 static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu)
663 {
664 return vcpu->arch.target >= 0;
665 }
666
check_vcpu_requests(struct kvm_vcpu * vcpu)667 static void check_vcpu_requests(struct kvm_vcpu *vcpu)
668 {
669 if (kvm_request_pending(vcpu)) {
670 if (kvm_check_request(KVM_REQ_SLEEP, vcpu))
671 vcpu_req_sleep(vcpu);
672
673 if (kvm_check_request(KVM_REQ_VCPU_RESET, vcpu))
674 kvm_reset_vcpu(vcpu);
675
676 /*
677 * Clear IRQ_PENDING requests that were made to guarantee
678 * that a VCPU sees new virtual interrupts.
679 */
680 kvm_check_request(KVM_REQ_IRQ_PENDING, vcpu);
681
682 if (kvm_check_request(KVM_REQ_RECORD_STEAL, vcpu))
683 kvm_update_stolen_time(vcpu);
684
685 if (kvm_check_request(KVM_REQ_RELOAD_GICv4, vcpu)) {
686 /* The distributor enable bits were changed */
687 preempt_disable();
688 vgic_v4_put(vcpu, false);
689 vgic_v4_load(vcpu);
690 preempt_enable();
691 }
692 }
693 }
694
695 /**
696 * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code
697 * @vcpu: The VCPU pointer
698 *
699 * This function is called through the VCPU_RUN ioctl called from user space. It
700 * will execute VM code in a loop until the time slice for the process is used
701 * or some emulation is needed from user space in which case the function will
702 * return with return value 0 and with the kvm_run structure filled in with the
703 * required data for the requested emulation.
704 */
kvm_arch_vcpu_ioctl_run(struct kvm_vcpu * vcpu)705 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
706 {
707 struct kvm_run *run = vcpu->run;
708 int ret;
709
710 if (unlikely(!kvm_vcpu_initialized(vcpu)))
711 return -ENOEXEC;
712
713 ret = kvm_vcpu_first_run_init(vcpu);
714 if (ret)
715 return ret;
716
717 if (run->exit_reason == KVM_EXIT_MMIO) {
718 ret = kvm_handle_mmio_return(vcpu);
719 if (ret)
720 return ret;
721 }
722
723 if (run->immediate_exit)
724 return -EINTR;
725
726 vcpu_load(vcpu);
727
728 kvm_sigset_activate(vcpu);
729
730 ret = 1;
731 run->exit_reason = KVM_EXIT_UNKNOWN;
732 while (ret > 0) {
733 /*
734 * Check conditions before entering the guest
735 */
736 cond_resched();
737
738 update_vmid(&vcpu->arch.hw_mmu->vmid);
739
740 check_vcpu_requests(vcpu);
741
742 /*
743 * Preparing the interrupts to be injected also
744 * involves poking the GIC, which must be done in a
745 * non-preemptible context.
746 */
747 preempt_disable();
748
749 kvm_pmu_flush_hwstate(vcpu);
750
751 local_irq_disable();
752
753 kvm_vgic_flush_hwstate(vcpu);
754
755 /*
756 * Exit if we have a signal pending so that we can deliver the
757 * signal to user space.
758 */
759 if (signal_pending(current)) {
760 ret = -EINTR;
761 run->exit_reason = KVM_EXIT_INTR;
762 }
763
764 /*
765 * If we're using a userspace irqchip, then check if we need
766 * to tell a userspace irqchip about timer or PMU level
767 * changes and if so, exit to userspace (the actual level
768 * state gets updated in kvm_timer_update_run and
769 * kvm_pmu_update_run below).
770 */
771 if (static_branch_unlikely(&userspace_irqchip_in_use)) {
772 if (kvm_timer_should_notify_user(vcpu) ||
773 kvm_pmu_should_notify_user(vcpu)) {
774 ret = -EINTR;
775 run->exit_reason = KVM_EXIT_INTR;
776 }
777 }
778
779 /*
780 * Ensure we set mode to IN_GUEST_MODE after we disable
781 * interrupts and before the final VCPU requests check.
782 * See the comment in kvm_vcpu_exiting_guest_mode() and
783 * Documentation/virt/kvm/vcpu-requests.rst
784 */
785 smp_store_mb(vcpu->mode, IN_GUEST_MODE);
786
787 if (ret <= 0 || need_new_vmid_gen(&vcpu->arch.hw_mmu->vmid) ||
788 kvm_request_pending(vcpu)) {
789 vcpu->mode = OUTSIDE_GUEST_MODE;
790 isb(); /* Ensure work in x_flush_hwstate is committed */
791 kvm_pmu_sync_hwstate(vcpu);
792 if (static_branch_unlikely(&userspace_irqchip_in_use))
793 kvm_timer_sync_user(vcpu);
794 kvm_vgic_sync_hwstate(vcpu);
795 local_irq_enable();
796 preempt_enable();
797 continue;
798 }
799
800 kvm_arm_setup_debug(vcpu);
801
802 /**************************************************************
803 * Enter the guest
804 */
805 trace_kvm_entry(*vcpu_pc(vcpu));
806 guest_enter_irqoff();
807
808 ret = kvm_call_hyp_ret(__kvm_vcpu_run, vcpu);
809
810 vcpu->mode = OUTSIDE_GUEST_MODE;
811 vcpu->stat.exits++;
812 /*
813 * Back from guest
814 *************************************************************/
815
816 kvm_arm_clear_debug(vcpu);
817
818 /*
819 * We must sync the PMU state before the vgic state so
820 * that the vgic can properly sample the updated state of the
821 * interrupt line.
822 */
823 kvm_pmu_sync_hwstate(vcpu);
824
825 /*
826 * Sync the vgic state before syncing the timer state because
827 * the timer code needs to know if the virtual timer
828 * interrupts are active.
829 */
830 kvm_vgic_sync_hwstate(vcpu);
831
832 /*
833 * Sync the timer hardware state before enabling interrupts as
834 * we don't want vtimer interrupts to race with syncing the
835 * timer virtual interrupt state.
836 */
837 if (static_branch_unlikely(&userspace_irqchip_in_use))
838 kvm_timer_sync_user(vcpu);
839
840 kvm_arch_vcpu_ctxsync_fp(vcpu);
841
842 /*
843 * We may have taken a host interrupt in HYP mode (ie
844 * while executing the guest). This interrupt is still
845 * pending, as we haven't serviced it yet!
846 *
847 * We're now back in SVC mode, with interrupts
848 * disabled. Enabling the interrupts now will have
849 * the effect of taking the interrupt again, in SVC
850 * mode this time.
851 */
852 local_irq_enable();
853
854 /*
855 * We do local_irq_enable() before calling guest_exit() so
856 * that if a timer interrupt hits while running the guest we
857 * account that tick as being spent in the guest. We enable
858 * preemption after calling guest_exit() so that if we get
859 * preempted we make sure ticks after that is not counted as
860 * guest time.
861 */
862 guest_exit();
863 trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu));
864
865 /* Exit types that need handling before we can be preempted */
866 handle_exit_early(vcpu, ret);
867
868 preempt_enable();
869
870 /*
871 * The ARMv8 architecture doesn't give the hypervisor
872 * a mechanism to prevent a guest from dropping to AArch32 EL0
873 * if implemented by the CPU. If we spot the guest in such
874 * state and that we decided it wasn't supposed to do so (like
875 * with the asymmetric AArch32 case), return to userspace with
876 * a fatal error.
877 */
878 if (!system_supports_32bit_el0() && vcpu_mode_is_32bit(vcpu)) {
879 /*
880 * As we have caught the guest red-handed, decide that
881 * it isn't fit for purpose anymore by making the vcpu
882 * invalid. The VMM can try and fix it by issuing a
883 * KVM_ARM_VCPU_INIT if it really wants to.
884 */
885 vcpu->arch.target = -1;
886 ret = ARM_EXCEPTION_IL;
887 }
888
889 ret = handle_exit(vcpu, ret);
890 }
891
892 /* Tell userspace about in-kernel device output levels */
893 if (unlikely(!irqchip_in_kernel(vcpu->kvm))) {
894 kvm_timer_update_run(vcpu);
895 kvm_pmu_update_run(vcpu);
896 }
897
898 kvm_sigset_deactivate(vcpu);
899
900 vcpu_put(vcpu);
901 return ret;
902 }
903
vcpu_interrupt_line(struct kvm_vcpu * vcpu,int number,bool level)904 static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level)
905 {
906 int bit_index;
907 bool set;
908 unsigned long *hcr;
909
910 if (number == KVM_ARM_IRQ_CPU_IRQ)
911 bit_index = __ffs(HCR_VI);
912 else /* KVM_ARM_IRQ_CPU_FIQ */
913 bit_index = __ffs(HCR_VF);
914
915 hcr = vcpu_hcr(vcpu);
916 if (level)
917 set = test_and_set_bit(bit_index, hcr);
918 else
919 set = test_and_clear_bit(bit_index, hcr);
920
921 /*
922 * If we didn't change anything, no need to wake up or kick other CPUs
923 */
924 if (set == level)
925 return 0;
926
927 /*
928 * The vcpu irq_lines field was updated, wake up sleeping VCPUs and
929 * trigger a world-switch round on the running physical CPU to set the
930 * virtual IRQ/FIQ fields in the HCR appropriately.
931 */
932 kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
933 kvm_vcpu_kick(vcpu);
934
935 return 0;
936 }
937
kvm_vm_ioctl_irq_line(struct kvm * kvm,struct kvm_irq_level * irq_level,bool line_status)938 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level,
939 bool line_status)
940 {
941 u32 irq = irq_level->irq;
942 unsigned int irq_type, vcpu_idx, irq_num;
943 int nrcpus = atomic_read(&kvm->online_vcpus);
944 struct kvm_vcpu *vcpu = NULL;
945 bool level = irq_level->level;
946
947 irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK;
948 vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK;
949 vcpu_idx += ((irq >> KVM_ARM_IRQ_VCPU2_SHIFT) & KVM_ARM_IRQ_VCPU2_MASK) * (KVM_ARM_IRQ_VCPU_MASK + 1);
950 irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK;
951
952 trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level);
953
954 switch (irq_type) {
955 case KVM_ARM_IRQ_TYPE_CPU:
956 if (irqchip_in_kernel(kvm))
957 return -ENXIO;
958
959 if (vcpu_idx >= nrcpus)
960 return -EINVAL;
961
962 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
963 if (!vcpu)
964 return -EINVAL;
965
966 if (irq_num > KVM_ARM_IRQ_CPU_FIQ)
967 return -EINVAL;
968
969 return vcpu_interrupt_line(vcpu, irq_num, level);
970 case KVM_ARM_IRQ_TYPE_PPI:
971 if (!irqchip_in_kernel(kvm))
972 return -ENXIO;
973
974 if (vcpu_idx >= nrcpus)
975 return -EINVAL;
976
977 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
978 if (!vcpu)
979 return -EINVAL;
980
981 if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS)
982 return -EINVAL;
983
984 return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level, NULL);
985 case KVM_ARM_IRQ_TYPE_SPI:
986 if (!irqchip_in_kernel(kvm))
987 return -ENXIO;
988
989 if (irq_num < VGIC_NR_PRIVATE_IRQS)
990 return -EINVAL;
991
992 return kvm_vgic_inject_irq(kvm, 0, irq_num, level, NULL);
993 }
994
995 return -EINVAL;
996 }
997
kvm_vcpu_set_target(struct kvm_vcpu * vcpu,const struct kvm_vcpu_init * init)998 static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu,
999 const struct kvm_vcpu_init *init)
1000 {
1001 unsigned int i, ret;
1002 int phys_target = kvm_target_cpu();
1003
1004 if (init->target != phys_target)
1005 return -EINVAL;
1006
1007 /*
1008 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
1009 * use the same target.
1010 */
1011 if (vcpu->arch.target != -1 && vcpu->arch.target != init->target)
1012 return -EINVAL;
1013
1014 /* -ENOENT for unknown features, -EINVAL for invalid combinations. */
1015 for (i = 0; i < sizeof(init->features) * 8; i++) {
1016 bool set = (init->features[i / 32] & (1 << (i % 32)));
1017
1018 if (set && i >= KVM_VCPU_MAX_FEATURES)
1019 return -ENOENT;
1020
1021 /*
1022 * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must
1023 * use the same feature set.
1024 */
1025 if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES &&
1026 test_bit(i, vcpu->arch.features) != set)
1027 return -EINVAL;
1028
1029 if (set)
1030 set_bit(i, vcpu->arch.features);
1031 }
1032
1033 vcpu->arch.target = phys_target;
1034
1035 /* Now we know what it is, we can reset it. */
1036 ret = kvm_reset_vcpu(vcpu);
1037 if (ret) {
1038 vcpu->arch.target = -1;
1039 bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES);
1040 }
1041
1042 return ret;
1043 }
1044
kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu * vcpu,struct kvm_vcpu_init * init)1045 static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
1046 struct kvm_vcpu_init *init)
1047 {
1048 int ret;
1049
1050 ret = kvm_vcpu_set_target(vcpu, init);
1051 if (ret)
1052 return ret;
1053
1054 /*
1055 * Ensure a rebooted VM will fault in RAM pages and detect if the
1056 * guest MMU is turned off and flush the caches as needed.
1057 *
1058 * S2FWB enforces all memory accesses to RAM being cacheable,
1059 * ensuring that the data side is always coherent. We still
1060 * need to invalidate the I-cache though, as FWB does *not*
1061 * imply CTR_EL0.DIC.
1062 */
1063 if (vcpu->arch.has_run_once) {
1064 if (!cpus_have_final_cap(ARM64_HAS_STAGE2_FWB))
1065 stage2_unmap_vm(vcpu->kvm);
1066 else
1067 __flush_icache_all();
1068 }
1069
1070 vcpu_reset_hcr(vcpu);
1071
1072 /*
1073 * Handle the "start in power-off" case.
1074 */
1075 if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features))
1076 vcpu_power_off(vcpu);
1077 else
1078 vcpu->arch.power_off = false;
1079
1080 return 0;
1081 }
1082
kvm_arm_vcpu_set_attr(struct kvm_vcpu * vcpu,struct kvm_device_attr * attr)1083 static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu,
1084 struct kvm_device_attr *attr)
1085 {
1086 int ret = -ENXIO;
1087
1088 switch (attr->group) {
1089 default:
1090 ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr);
1091 break;
1092 }
1093
1094 return ret;
1095 }
1096
kvm_arm_vcpu_get_attr(struct kvm_vcpu * vcpu,struct kvm_device_attr * attr)1097 static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu,
1098 struct kvm_device_attr *attr)
1099 {
1100 int ret = -ENXIO;
1101
1102 switch (attr->group) {
1103 default:
1104 ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr);
1105 break;
1106 }
1107
1108 return ret;
1109 }
1110
kvm_arm_vcpu_has_attr(struct kvm_vcpu * vcpu,struct kvm_device_attr * attr)1111 static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu,
1112 struct kvm_device_attr *attr)
1113 {
1114 int ret = -ENXIO;
1115
1116 switch (attr->group) {
1117 default:
1118 ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr);
1119 break;
1120 }
1121
1122 return ret;
1123 }
1124
kvm_arm_vcpu_get_events(struct kvm_vcpu * vcpu,struct kvm_vcpu_events * events)1125 static int kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
1126 struct kvm_vcpu_events *events)
1127 {
1128 memset(events, 0, sizeof(*events));
1129
1130 return __kvm_arm_vcpu_get_events(vcpu, events);
1131 }
1132
kvm_arm_vcpu_set_events(struct kvm_vcpu * vcpu,struct kvm_vcpu_events * events)1133 static int kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
1134 struct kvm_vcpu_events *events)
1135 {
1136 int i;
1137
1138 /* check whether the reserved field is zero */
1139 for (i = 0; i < ARRAY_SIZE(events->reserved); i++)
1140 if (events->reserved[i])
1141 return -EINVAL;
1142
1143 /* check whether the pad field is zero */
1144 for (i = 0; i < ARRAY_SIZE(events->exception.pad); i++)
1145 if (events->exception.pad[i])
1146 return -EINVAL;
1147
1148 return __kvm_arm_vcpu_set_events(vcpu, events);
1149 }
1150
kvm_arch_vcpu_ioctl(struct file * filp,unsigned int ioctl,unsigned long arg)1151 long kvm_arch_vcpu_ioctl(struct file *filp,
1152 unsigned int ioctl, unsigned long arg)
1153 {
1154 struct kvm_vcpu *vcpu = filp->private_data;
1155 void __user *argp = (void __user *)arg;
1156 struct kvm_device_attr attr;
1157 long r;
1158
1159 switch (ioctl) {
1160 case KVM_ARM_VCPU_INIT: {
1161 struct kvm_vcpu_init init;
1162
1163 r = -EFAULT;
1164 if (copy_from_user(&init, argp, sizeof(init)))
1165 break;
1166
1167 r = kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init);
1168 break;
1169 }
1170 case KVM_SET_ONE_REG:
1171 case KVM_GET_ONE_REG: {
1172 struct kvm_one_reg reg;
1173
1174 r = -ENOEXEC;
1175 if (unlikely(!kvm_vcpu_initialized(vcpu)))
1176 break;
1177
1178 r = -EFAULT;
1179 if (copy_from_user(®, argp, sizeof(reg)))
1180 break;
1181
1182 if (ioctl == KVM_SET_ONE_REG)
1183 r = kvm_arm_set_reg(vcpu, ®);
1184 else
1185 r = kvm_arm_get_reg(vcpu, ®);
1186 break;
1187 }
1188 case KVM_GET_REG_LIST: {
1189 struct kvm_reg_list __user *user_list = argp;
1190 struct kvm_reg_list reg_list;
1191 unsigned n;
1192
1193 r = -ENOEXEC;
1194 if (unlikely(!kvm_vcpu_initialized(vcpu)))
1195 break;
1196
1197 r = -EPERM;
1198 if (!kvm_arm_vcpu_is_finalized(vcpu))
1199 break;
1200
1201 r = -EFAULT;
1202 if (copy_from_user(®_list, user_list, sizeof(reg_list)))
1203 break;
1204 n = reg_list.n;
1205 reg_list.n = kvm_arm_num_regs(vcpu);
1206 if (copy_to_user(user_list, ®_list, sizeof(reg_list)))
1207 break;
1208 r = -E2BIG;
1209 if (n < reg_list.n)
1210 break;
1211 r = kvm_arm_copy_reg_indices(vcpu, user_list->reg);
1212 break;
1213 }
1214 case KVM_SET_DEVICE_ATTR: {
1215 r = -EFAULT;
1216 if (copy_from_user(&attr, argp, sizeof(attr)))
1217 break;
1218 r = kvm_arm_vcpu_set_attr(vcpu, &attr);
1219 break;
1220 }
1221 case KVM_GET_DEVICE_ATTR: {
1222 r = -EFAULT;
1223 if (copy_from_user(&attr, argp, sizeof(attr)))
1224 break;
1225 r = kvm_arm_vcpu_get_attr(vcpu, &attr);
1226 break;
1227 }
1228 case KVM_HAS_DEVICE_ATTR: {
1229 r = -EFAULT;
1230 if (copy_from_user(&attr, argp, sizeof(attr)))
1231 break;
1232 r = kvm_arm_vcpu_has_attr(vcpu, &attr);
1233 break;
1234 }
1235 case KVM_GET_VCPU_EVENTS: {
1236 struct kvm_vcpu_events events;
1237
1238 if (kvm_arm_vcpu_get_events(vcpu, &events))
1239 return -EINVAL;
1240
1241 if (copy_to_user(argp, &events, sizeof(events)))
1242 return -EFAULT;
1243
1244 return 0;
1245 }
1246 case KVM_SET_VCPU_EVENTS: {
1247 struct kvm_vcpu_events events;
1248
1249 if (copy_from_user(&events, argp, sizeof(events)))
1250 return -EFAULT;
1251
1252 return kvm_arm_vcpu_set_events(vcpu, &events);
1253 }
1254 case KVM_ARM_VCPU_FINALIZE: {
1255 int what;
1256
1257 if (!kvm_vcpu_initialized(vcpu))
1258 return -ENOEXEC;
1259
1260 if (get_user(what, (const int __user *)argp))
1261 return -EFAULT;
1262
1263 return kvm_arm_vcpu_finalize(vcpu, what);
1264 }
1265 default:
1266 r = -EINVAL;
1267 }
1268
1269 return r;
1270 }
1271
kvm_arch_sync_dirty_log(struct kvm * kvm,struct kvm_memory_slot * memslot)1272 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
1273 {
1274
1275 }
1276
kvm_arch_flush_remote_tlbs_memslot(struct kvm * kvm,const struct kvm_memory_slot * memslot)1277 void kvm_arch_flush_remote_tlbs_memslot(struct kvm *kvm,
1278 const struct kvm_memory_slot *memslot)
1279 {
1280 kvm_flush_remote_tlbs(kvm);
1281 }
1282
kvm_vm_ioctl_set_device_addr(struct kvm * kvm,struct kvm_arm_device_addr * dev_addr)1283 static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
1284 struct kvm_arm_device_addr *dev_addr)
1285 {
1286 unsigned long dev_id, type;
1287
1288 dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >>
1289 KVM_ARM_DEVICE_ID_SHIFT;
1290 type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >>
1291 KVM_ARM_DEVICE_TYPE_SHIFT;
1292
1293 switch (dev_id) {
1294 case KVM_ARM_DEVICE_VGIC_V2:
1295 if (!vgic_present)
1296 return -ENXIO;
1297 return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
1298 default:
1299 return -ENODEV;
1300 }
1301 }
1302
kvm_arch_vm_ioctl(struct file * filp,unsigned int ioctl,unsigned long arg)1303 long kvm_arch_vm_ioctl(struct file *filp,
1304 unsigned int ioctl, unsigned long arg)
1305 {
1306 struct kvm *kvm = filp->private_data;
1307 void __user *argp = (void __user *)arg;
1308
1309 switch (ioctl) {
1310 case KVM_CREATE_IRQCHIP: {
1311 int ret;
1312 if (!vgic_present)
1313 return -ENXIO;
1314 mutex_lock(&kvm->lock);
1315 ret = kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2);
1316 mutex_unlock(&kvm->lock);
1317 return ret;
1318 }
1319 case KVM_ARM_SET_DEVICE_ADDR: {
1320 struct kvm_arm_device_addr dev_addr;
1321
1322 if (copy_from_user(&dev_addr, argp, sizeof(dev_addr)))
1323 return -EFAULT;
1324 return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr);
1325 }
1326 case KVM_ARM_PREFERRED_TARGET: {
1327 int err;
1328 struct kvm_vcpu_init init;
1329
1330 err = kvm_vcpu_preferred_target(&init);
1331 if (err)
1332 return err;
1333
1334 if (copy_to_user(argp, &init, sizeof(init)))
1335 return -EFAULT;
1336
1337 return 0;
1338 }
1339 default:
1340 return -EINVAL;
1341 }
1342 }
1343
nvhe_percpu_size(void)1344 static unsigned long nvhe_percpu_size(void)
1345 {
1346 return (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_end) -
1347 (unsigned long)CHOOSE_NVHE_SYM(__per_cpu_start);
1348 }
1349
nvhe_percpu_order(void)1350 static unsigned long nvhe_percpu_order(void)
1351 {
1352 unsigned long size = nvhe_percpu_size();
1353
1354 return size ? get_order(size) : 0;
1355 }
1356
1357 /* A lookup table holding the hypervisor VA for each vector slot */
1358 static void *hyp_spectre_vector_selector[BP_HARDEN_EL2_SLOTS];
1359
kvm_init_vector_slot(void * base,enum arm64_hyp_spectre_vector slot)1360 static void kvm_init_vector_slot(void *base, enum arm64_hyp_spectre_vector slot)
1361 {
1362 hyp_spectre_vector_selector[slot] = __kvm_vector_slot2addr(base, slot);
1363 }
1364
kvm_init_vector_slots(void)1365 static int kvm_init_vector_slots(void)
1366 {
1367 int err;
1368 void *base;
1369
1370 base = kern_hyp_va(kvm_ksym_ref(__kvm_hyp_vector));
1371 kvm_init_vector_slot(base, HYP_VECTOR_DIRECT);
1372
1373 base = kern_hyp_va(kvm_ksym_ref(__bp_harden_hyp_vecs));
1374 kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_DIRECT);
1375
1376 if (!cpus_have_const_cap(ARM64_SPECTRE_V3A))
1377 return 0;
1378
1379 if (!has_vhe()) {
1380 err = create_hyp_exec_mappings(__pa_symbol(__bp_harden_hyp_vecs),
1381 __BP_HARDEN_HYP_VECS_SZ, &base);
1382 if (err)
1383 return err;
1384 }
1385
1386 kvm_init_vector_slot(base, HYP_VECTOR_INDIRECT);
1387 kvm_init_vector_slot(base, HYP_VECTOR_SPECTRE_INDIRECT);
1388 return 0;
1389 }
1390
cpu_prepare_hyp_mode(int cpu)1391 static void cpu_prepare_hyp_mode(int cpu)
1392 {
1393 struct kvm_nvhe_init_params *params = per_cpu_ptr_nvhe_sym(kvm_init_params, cpu);
1394 unsigned long tcr;
1395
1396 /*
1397 * Calculate the raw per-cpu offset without a translation from the
1398 * kernel's mapping to the linear mapping, and store it in tpidr_el2
1399 * so that we can use adr_l to access per-cpu variables in EL2.
1400 * Also drop the KASAN tag which gets in the way...
1401 */
1402 params->tpidr_el2 = (unsigned long)kasan_reset_tag(per_cpu_ptr_nvhe_sym(__per_cpu_start, cpu)) -
1403 (unsigned long)kvm_ksym_ref(CHOOSE_NVHE_SYM(__per_cpu_start));
1404
1405 params->mair_el2 = read_sysreg(mair_el1);
1406
1407 /*
1408 * The ID map may be configured to use an extended virtual address
1409 * range. This is only the case if system RAM is out of range for the
1410 * currently configured page size and VA_BITS, in which case we will
1411 * also need the extended virtual range for the HYP ID map, or we won't
1412 * be able to enable the EL2 MMU.
1413 *
1414 * However, at EL2, there is only one TTBR register, and we can't switch
1415 * between translation tables *and* update TCR_EL2.T0SZ at the same
1416 * time. Bottom line: we need to use the extended range with *both* our
1417 * translation tables.
1418 *
1419 * So use the same T0SZ value we use for the ID map.
1420 */
1421 tcr = (read_sysreg(tcr_el1) & TCR_EL2_MASK) | TCR_EL2_RES1;
1422 tcr &= ~TCR_T0SZ_MASK;
1423 tcr |= (idmap_t0sz & GENMASK(TCR_TxSZ_WIDTH - 1, 0)) << TCR_T0SZ_OFFSET;
1424 params->tcr_el2 = tcr;
1425
1426 params->stack_hyp_va = kern_hyp_va(per_cpu(kvm_arm_hyp_stack_page, cpu) + PAGE_SIZE);
1427 params->pgd_pa = kvm_mmu_get_httbr();
1428 if (is_protected_kvm_enabled())
1429 params->hcr_el2 = HCR_HOST_NVHE_PROTECTED_FLAGS;
1430 else
1431 params->hcr_el2 = HCR_HOST_NVHE_FLAGS;
1432 params->vttbr = params->vtcr = 0;
1433
1434 /*
1435 * Flush the init params from the data cache because the struct will
1436 * be read while the MMU is off.
1437 */
1438 kvm_flush_dcache_to_poc(params, sizeof(*params));
1439 }
1440
hyp_install_host_vector(void)1441 static void hyp_install_host_vector(void)
1442 {
1443 struct kvm_nvhe_init_params *params;
1444 struct arm_smccc_res res;
1445
1446 /* Switch from the HYP stub to our own HYP init vector */
1447 __hyp_set_vectors(kvm_get_idmap_vector());
1448
1449 /*
1450 * Call initialization code, and switch to the full blown HYP code.
1451 * If the cpucaps haven't been finalized yet, something has gone very
1452 * wrong, and hyp will crash and burn when it uses any
1453 * cpus_have_const_cap() wrapper.
1454 */
1455 BUG_ON(!system_capabilities_finalized());
1456 params = this_cpu_ptr_nvhe_sym(kvm_init_params);
1457 arm_smccc_1_1_hvc(KVM_HOST_SMCCC_FUNC(__kvm_hyp_init), virt_to_phys(params), &res);
1458 WARN_ON(res.a0 != SMCCC_RET_SUCCESS);
1459 }
1460
cpu_init_hyp_mode(void)1461 static void cpu_init_hyp_mode(void)
1462 {
1463 hyp_install_host_vector();
1464
1465 /*
1466 * Disabling SSBD on a non-VHE system requires us to enable SSBS
1467 * at EL2.
1468 */
1469 if (this_cpu_has_cap(ARM64_SSBS) &&
1470 arm64_get_spectre_v4_state() == SPECTRE_VULNERABLE) {
1471 kvm_call_hyp_nvhe(__kvm_enable_ssbs);
1472 }
1473 }
1474
cpu_hyp_reset(void)1475 static void cpu_hyp_reset(void)
1476 {
1477 if (!is_kernel_in_hyp_mode())
1478 __hyp_reset_vectors();
1479 }
1480
1481 /*
1482 * EL2 vectors can be mapped and rerouted in a number of ways,
1483 * depending on the kernel configuration and CPU present:
1484 *
1485 * - If the CPU is affected by Spectre-v2, the hardening sequence is
1486 * placed in one of the vector slots, which is executed before jumping
1487 * to the real vectors.
1488 *
1489 * - If the CPU also has the ARM64_SPECTRE_V3A cap, the slot
1490 * containing the hardening sequence is mapped next to the idmap page,
1491 * and executed before jumping to the real vectors.
1492 *
1493 * - If the CPU only has the ARM64_SPECTRE_V3A cap, then an
1494 * empty slot is selected, mapped next to the idmap page, and
1495 * executed before jumping to the real vectors.
1496 *
1497 * Note that ARM64_SPECTRE_V3A is somewhat incompatible with
1498 * VHE, as we don't have hypervisor-specific mappings. If the system
1499 * is VHE and yet selects this capability, it will be ignored.
1500 */
cpu_set_hyp_vector(void)1501 static void cpu_set_hyp_vector(void)
1502 {
1503 struct bp_hardening_data *data = this_cpu_ptr(&bp_hardening_data);
1504 void *vector = hyp_spectre_vector_selector[data->slot];
1505
1506 if (!is_protected_kvm_enabled())
1507 *this_cpu_ptr_hyp_sym(kvm_hyp_vector) = (unsigned long)vector;
1508 else
1509 kvm_call_hyp_nvhe(__pkvm_cpu_set_vector, data->slot);
1510 }
1511
cpu_hyp_reinit(void)1512 static void cpu_hyp_reinit(void)
1513 {
1514 kvm_init_host_cpu_context(&this_cpu_ptr_hyp_sym(kvm_host_data)->host_ctxt);
1515
1516 cpu_hyp_reset();
1517
1518 if (is_kernel_in_hyp_mode())
1519 kvm_timer_init_vhe();
1520 else
1521 cpu_init_hyp_mode();
1522
1523 cpu_set_hyp_vector();
1524
1525 kvm_arm_init_debug();
1526
1527 if (vgic_present)
1528 kvm_vgic_init_cpu_hardware();
1529 }
1530
_kvm_arch_hardware_enable(void * discard)1531 static void _kvm_arch_hardware_enable(void *discard)
1532 {
1533 if (!__this_cpu_read(kvm_arm_hardware_enabled)) {
1534 cpu_hyp_reinit();
1535 __this_cpu_write(kvm_arm_hardware_enabled, 1);
1536 }
1537 }
1538
kvm_arch_hardware_enable(void)1539 int kvm_arch_hardware_enable(void)
1540 {
1541 _kvm_arch_hardware_enable(NULL);
1542 return 0;
1543 }
1544
_kvm_arch_hardware_disable(void * discard)1545 static void _kvm_arch_hardware_disable(void *discard)
1546 {
1547 if (__this_cpu_read(kvm_arm_hardware_enabled)) {
1548 cpu_hyp_reset();
1549 __this_cpu_write(kvm_arm_hardware_enabled, 0);
1550 }
1551 }
1552
kvm_arch_hardware_disable(void)1553 void kvm_arch_hardware_disable(void)
1554 {
1555 if (!is_protected_kvm_enabled())
1556 _kvm_arch_hardware_disable(NULL);
1557 }
1558
1559 #ifdef CONFIG_CPU_PM
hyp_init_cpu_pm_notifier(struct notifier_block * self,unsigned long cmd,void * v)1560 static int hyp_init_cpu_pm_notifier(struct notifier_block *self,
1561 unsigned long cmd,
1562 void *v)
1563 {
1564 /*
1565 * kvm_arm_hardware_enabled is left with its old value over
1566 * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should
1567 * re-enable hyp.
1568 */
1569 switch (cmd) {
1570 case CPU_PM_ENTER:
1571 if (__this_cpu_read(kvm_arm_hardware_enabled))
1572 /*
1573 * don't update kvm_arm_hardware_enabled here
1574 * so that the hardware will be re-enabled
1575 * when we resume. See below.
1576 */
1577 cpu_hyp_reset();
1578
1579 return NOTIFY_OK;
1580 case CPU_PM_ENTER_FAILED:
1581 case CPU_PM_EXIT:
1582 if (__this_cpu_read(kvm_arm_hardware_enabled))
1583 /* The hardware was enabled before suspend. */
1584 cpu_hyp_reinit();
1585
1586 return NOTIFY_OK;
1587
1588 default:
1589 return NOTIFY_DONE;
1590 }
1591 }
1592
1593 static struct notifier_block hyp_init_cpu_pm_nb = {
1594 .notifier_call = hyp_init_cpu_pm_notifier,
1595 };
1596
hyp_cpu_pm_init(void)1597 static void hyp_cpu_pm_init(void)
1598 {
1599 if (!is_protected_kvm_enabled())
1600 cpu_pm_register_notifier(&hyp_init_cpu_pm_nb);
1601 }
hyp_cpu_pm_exit(void)1602 static void hyp_cpu_pm_exit(void)
1603 {
1604 if (!is_protected_kvm_enabled())
1605 cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb);
1606 }
1607 #else
hyp_cpu_pm_init(void)1608 static inline void hyp_cpu_pm_init(void)
1609 {
1610 }
hyp_cpu_pm_exit(void)1611 static inline void hyp_cpu_pm_exit(void)
1612 {
1613 }
1614 #endif
1615
init_cpu_logical_map(void)1616 static void init_cpu_logical_map(void)
1617 {
1618 unsigned int cpu;
1619
1620 /*
1621 * Copy the MPIDR <-> logical CPU ID mapping to hyp.
1622 * Only copy the set of online CPUs whose features have been chacked
1623 * against the finalized system capabilities. The hypervisor will not
1624 * allow any other CPUs from the `possible` set to boot.
1625 */
1626 for_each_online_cpu(cpu)
1627 hyp_cpu_logical_map[cpu] = cpu_logical_map(cpu);
1628 }
1629
1630 #define init_psci_0_1_impl_state(config, what) \
1631 config.psci_0_1_ ## what ## _implemented = psci_ops.what
1632
init_psci_relay(void)1633 static bool init_psci_relay(void)
1634 {
1635 /*
1636 * If PSCI has not been initialized, protected KVM cannot install
1637 * itself on newly booted CPUs.
1638 */
1639 if (!psci_ops.get_version) {
1640 kvm_err("Cannot initialize protected mode without PSCI\n");
1641 return false;
1642 }
1643
1644 kvm_host_psci_config.version = psci_ops.get_version();
1645
1646 if (kvm_host_psci_config.version == PSCI_VERSION(0, 1)) {
1647 kvm_host_psci_config.function_ids_0_1 = get_psci_0_1_function_ids();
1648 init_psci_0_1_impl_state(kvm_host_psci_config, cpu_suspend);
1649 init_psci_0_1_impl_state(kvm_host_psci_config, cpu_on);
1650 init_psci_0_1_impl_state(kvm_host_psci_config, cpu_off);
1651 init_psci_0_1_impl_state(kvm_host_psci_config, migrate);
1652 }
1653 return true;
1654 }
1655
init_common_resources(void)1656 static int init_common_resources(void)
1657 {
1658 return kvm_set_ipa_limit();
1659 }
1660
init_subsystems(void)1661 static int init_subsystems(void)
1662 {
1663 int err = 0;
1664
1665 /*
1666 * Enable hardware so that subsystem initialisation can access EL2.
1667 */
1668 on_each_cpu(_kvm_arch_hardware_enable, NULL, 1);
1669
1670 /*
1671 * Register CPU lower-power notifier
1672 */
1673 hyp_cpu_pm_init();
1674
1675 /*
1676 * Init HYP view of VGIC
1677 */
1678 err = kvm_vgic_hyp_init();
1679 switch (err) {
1680 case 0:
1681 vgic_present = true;
1682 break;
1683 case -ENODEV:
1684 case -ENXIO:
1685 vgic_present = false;
1686 err = 0;
1687 break;
1688 default:
1689 goto out;
1690 }
1691
1692 /*
1693 * Init HYP architected timer support
1694 */
1695 err = kvm_timer_hyp_init(vgic_present);
1696 if (err)
1697 goto out;
1698
1699 kvm_perf_init();
1700 kvm_sys_reg_table_init();
1701
1702 out:
1703 if (err || !is_protected_kvm_enabled())
1704 on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
1705
1706 return err;
1707 }
1708
teardown_hyp_mode(void)1709 static void teardown_hyp_mode(void)
1710 {
1711 int cpu;
1712
1713 free_hyp_pgds();
1714 for_each_possible_cpu(cpu) {
1715 free_page(per_cpu(kvm_arm_hyp_stack_page, cpu));
1716 free_pages(kvm_arm_hyp_percpu_base[cpu], nvhe_percpu_order());
1717 }
1718 }
1719
do_pkvm_init(u32 hyp_va_bits)1720 static int do_pkvm_init(u32 hyp_va_bits)
1721 {
1722 void *per_cpu_base = kvm_ksym_ref(kvm_arm_hyp_percpu_base);
1723 int ret;
1724
1725 preempt_disable();
1726 hyp_install_host_vector();
1727 ret = kvm_call_hyp_nvhe(__pkvm_init, hyp_mem_base, hyp_mem_size,
1728 num_possible_cpus(), kern_hyp_va(per_cpu_base),
1729 hyp_va_bits);
1730 preempt_enable();
1731
1732 return ret;
1733 }
1734
kvm_hyp_init_protection(u32 hyp_va_bits)1735 static int kvm_hyp_init_protection(u32 hyp_va_bits)
1736 {
1737 void *addr = phys_to_virt(hyp_mem_base);
1738 int ret;
1739
1740 kvm_nvhe_sym(id_aa64mmfr0_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR0_EL1);
1741 kvm_nvhe_sym(id_aa64mmfr1_el1_sys_val) = read_sanitised_ftr_reg(SYS_ID_AA64MMFR1_EL1);
1742
1743 ret = create_hyp_mappings(addr, addr + hyp_mem_size, PAGE_HYP);
1744 if (ret)
1745 return ret;
1746
1747 ret = do_pkvm_init(hyp_va_bits);
1748 if (ret)
1749 return ret;
1750
1751 free_hyp_pgds();
1752
1753 return 0;
1754 }
1755
1756 /**
1757 * Inits Hyp-mode on all online CPUs
1758 */
init_hyp_mode(void)1759 static int init_hyp_mode(void)
1760 {
1761 u32 hyp_va_bits;
1762 int cpu;
1763 int err = -ENOMEM;
1764
1765 /*
1766 * The protected Hyp-mode cannot be initialized if the memory pool
1767 * allocation has failed.
1768 */
1769 if (is_protected_kvm_enabled() && !hyp_mem_base)
1770 goto out_err;
1771
1772 /*
1773 * Allocate Hyp PGD and setup Hyp identity mapping
1774 */
1775 err = kvm_mmu_init(&hyp_va_bits);
1776 if (err)
1777 goto out_err;
1778
1779 /*
1780 * Allocate stack pages for Hypervisor-mode
1781 */
1782 for_each_possible_cpu(cpu) {
1783 unsigned long stack_page;
1784
1785 stack_page = __get_free_page(GFP_KERNEL);
1786 if (!stack_page) {
1787 err = -ENOMEM;
1788 goto out_err;
1789 }
1790
1791 per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page;
1792 }
1793
1794 /*
1795 * Allocate and initialize pages for Hypervisor-mode percpu regions.
1796 */
1797 for_each_possible_cpu(cpu) {
1798 struct page *page;
1799 void *page_addr;
1800
1801 page = alloc_pages(GFP_KERNEL, nvhe_percpu_order());
1802 if (!page) {
1803 err = -ENOMEM;
1804 goto out_err;
1805 }
1806
1807 page_addr = page_address(page);
1808 memcpy(page_addr, CHOOSE_NVHE_SYM(__per_cpu_start), nvhe_percpu_size());
1809 kvm_arm_hyp_percpu_base[cpu] = (unsigned long)page_addr;
1810 }
1811
1812 /*
1813 * Map the Hyp-code called directly from the host
1814 */
1815 err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start),
1816 kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC);
1817 if (err) {
1818 kvm_err("Cannot map world-switch code\n");
1819 goto out_err;
1820 }
1821
1822 err = create_hyp_mappings(kvm_ksym_ref(__hyp_rodata_start),
1823 kvm_ksym_ref(__hyp_rodata_end), PAGE_HYP_RO);
1824 if (err) {
1825 kvm_err("Cannot map .hyp.rodata section\n");
1826 goto out_err;
1827 }
1828
1829 err = create_hyp_mappings(kvm_ksym_ref(__start_rodata),
1830 kvm_ksym_ref(__end_rodata), PAGE_HYP_RO);
1831 if (err) {
1832 kvm_err("Cannot map rodata section\n");
1833 goto out_err;
1834 }
1835
1836 /*
1837 * .hyp.bss is guaranteed to be placed at the beginning of the .bss
1838 * section thanks to an assertion in the linker script. Map it RW and
1839 * the rest of .bss RO.
1840 */
1841 err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_start),
1842 kvm_ksym_ref(__hyp_bss_end), PAGE_HYP);
1843 if (err) {
1844 kvm_err("Cannot map hyp bss section: %d\n", err);
1845 goto out_err;
1846 }
1847
1848 err = create_hyp_mappings(kvm_ksym_ref(__hyp_bss_end),
1849 kvm_ksym_ref(__bss_stop), PAGE_HYP_RO);
1850 if (err) {
1851 kvm_err("Cannot map bss section\n");
1852 goto out_err;
1853 }
1854
1855 /*
1856 * Map the Hyp stack pages
1857 */
1858 for_each_possible_cpu(cpu) {
1859 char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu);
1860 err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE,
1861 PAGE_HYP);
1862
1863 if (err) {
1864 kvm_err("Cannot map hyp stack\n");
1865 goto out_err;
1866 }
1867 }
1868
1869 for_each_possible_cpu(cpu) {
1870 char *percpu_begin = (char *)kvm_arm_hyp_percpu_base[cpu];
1871 char *percpu_end = percpu_begin + nvhe_percpu_size();
1872
1873 /* Map Hyp percpu pages */
1874 err = create_hyp_mappings(percpu_begin, percpu_end, PAGE_HYP);
1875 if (err) {
1876 kvm_err("Cannot map hyp percpu region\n");
1877 goto out_err;
1878 }
1879
1880 /* Prepare the CPU initialization parameters */
1881 cpu_prepare_hyp_mode(cpu);
1882 }
1883
1884 if (is_protected_kvm_enabled()) {
1885 init_cpu_logical_map();
1886
1887 if (!init_psci_relay()) {
1888 err = -ENODEV;
1889 goto out_err;
1890 }
1891 }
1892
1893 if (is_protected_kvm_enabled()) {
1894 err = kvm_hyp_init_protection(hyp_va_bits);
1895 if (err) {
1896 kvm_err("Failed to init hyp memory protection\n");
1897 goto out_err;
1898 }
1899 }
1900
1901 return 0;
1902
1903 out_err:
1904 teardown_hyp_mode();
1905 kvm_err("error initializing Hyp mode: %d\n", err);
1906 return err;
1907 }
1908
_kvm_host_prot_finalize(void * discard)1909 static void _kvm_host_prot_finalize(void *discard)
1910 {
1911 WARN_ON(kvm_call_hyp_nvhe(__pkvm_prot_finalize));
1912 }
1913
pkvm_mark_hyp(phys_addr_t start,phys_addr_t end)1914 static inline int pkvm_mark_hyp(phys_addr_t start, phys_addr_t end)
1915 {
1916 return kvm_call_hyp_nvhe(__pkvm_mark_hyp, start, end);
1917 }
1918
1919 #define pkvm_mark_hyp_section(__section) \
1920 pkvm_mark_hyp(__pa_symbol(__section##_start), \
1921 __pa_symbol(__section##_end))
1922
finalize_hyp_mode(void)1923 static int finalize_hyp_mode(void)
1924 {
1925 int cpu, ret;
1926
1927 if (!is_protected_kvm_enabled())
1928 return 0;
1929
1930 ret = pkvm_mark_hyp_section(__hyp_idmap_text);
1931 if (ret)
1932 return ret;
1933
1934 ret = pkvm_mark_hyp_section(__hyp_text);
1935 if (ret)
1936 return ret;
1937
1938 ret = pkvm_mark_hyp_section(__hyp_rodata);
1939 if (ret)
1940 return ret;
1941
1942 ret = pkvm_mark_hyp_section(__hyp_bss);
1943 if (ret)
1944 return ret;
1945
1946 ret = pkvm_mark_hyp(hyp_mem_base, hyp_mem_base + hyp_mem_size);
1947 if (ret)
1948 return ret;
1949
1950 for_each_possible_cpu(cpu) {
1951 phys_addr_t start = virt_to_phys((void *)kvm_arm_hyp_percpu_base[cpu]);
1952 phys_addr_t end = start + (PAGE_SIZE << nvhe_percpu_order());
1953
1954 ret = pkvm_mark_hyp(start, end);
1955 if (ret)
1956 return ret;
1957
1958 start = virt_to_phys((void *)per_cpu(kvm_arm_hyp_stack_page, cpu));
1959 end = start + PAGE_SIZE;
1960 ret = pkvm_mark_hyp(start, end);
1961 if (ret)
1962 return ret;
1963 }
1964
1965 /*
1966 * Flip the static key upfront as that may no longer be possible
1967 * once the host stage 2 is installed.
1968 */
1969 static_branch_enable(&kvm_protected_mode_initialized);
1970 on_each_cpu(_kvm_host_prot_finalize, NULL, 1);
1971
1972 return 0;
1973 }
1974
check_kvm_target_cpu(void * ret)1975 static void check_kvm_target_cpu(void *ret)
1976 {
1977 *(int *)ret = kvm_target_cpu();
1978 }
1979
kvm_mpidr_to_vcpu(struct kvm * kvm,unsigned long mpidr)1980 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
1981 {
1982 struct kvm_vcpu *vcpu;
1983 int i;
1984
1985 mpidr &= MPIDR_HWID_BITMASK;
1986 kvm_for_each_vcpu(i, vcpu, kvm) {
1987 if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu))
1988 return vcpu;
1989 }
1990 return NULL;
1991 }
1992
kvm_arch_has_irq_bypass(void)1993 bool kvm_arch_has_irq_bypass(void)
1994 {
1995 return true;
1996 }
1997
kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer * cons,struct irq_bypass_producer * prod)1998 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
1999 struct irq_bypass_producer *prod)
2000 {
2001 struct kvm_kernel_irqfd *irqfd =
2002 container_of(cons, struct kvm_kernel_irqfd, consumer);
2003
2004 return kvm_vgic_v4_set_forwarding(irqfd->kvm, prod->irq,
2005 &irqfd->irq_entry);
2006 }
kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer * cons,struct irq_bypass_producer * prod)2007 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
2008 struct irq_bypass_producer *prod)
2009 {
2010 struct kvm_kernel_irqfd *irqfd =
2011 container_of(cons, struct kvm_kernel_irqfd, consumer);
2012
2013 kvm_vgic_v4_unset_forwarding(irqfd->kvm, prod->irq,
2014 &irqfd->irq_entry);
2015 }
2016
kvm_arch_irq_bypass_stop(struct irq_bypass_consumer * cons)2017 void kvm_arch_irq_bypass_stop(struct irq_bypass_consumer *cons)
2018 {
2019 struct kvm_kernel_irqfd *irqfd =
2020 container_of(cons, struct kvm_kernel_irqfd, consumer);
2021
2022 kvm_arm_halt_guest(irqfd->kvm);
2023 }
2024
kvm_arch_irq_bypass_start(struct irq_bypass_consumer * cons)2025 void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
2026 {
2027 struct kvm_kernel_irqfd *irqfd =
2028 container_of(cons, struct kvm_kernel_irqfd, consumer);
2029
2030 kvm_arm_resume_guest(irqfd->kvm);
2031 }
2032
2033 /**
2034 * Initialize Hyp-mode and memory mappings on all CPUs.
2035 */
kvm_arch_init(void * opaque)2036 int kvm_arch_init(void *opaque)
2037 {
2038 int err;
2039 int ret, cpu;
2040 bool in_hyp_mode;
2041
2042 if (!is_hyp_mode_available()) {
2043 kvm_info("HYP mode not available\n");
2044 return -ENODEV;
2045 }
2046
2047 in_hyp_mode = is_kernel_in_hyp_mode();
2048
2049 if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) ||
2050 cpus_have_final_cap(ARM64_WORKAROUND_1508412))
2051 kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \
2052 "Only trusted guests should be used on this system.\n");
2053
2054 for_each_online_cpu(cpu) {
2055 smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
2056 if (ret < 0) {
2057 kvm_err("Error, CPU %d not supported!\n", cpu);
2058 return -ENODEV;
2059 }
2060 }
2061
2062 err = init_common_resources();
2063 if (err)
2064 return err;
2065
2066 err = kvm_arm_init_sve();
2067 if (err)
2068 return err;
2069
2070 if (!in_hyp_mode) {
2071 err = init_hyp_mode();
2072 if (err)
2073 goto out_err;
2074 }
2075
2076 err = kvm_init_vector_slots();
2077 if (err) {
2078 kvm_err("Cannot initialise vector slots\n");
2079 goto out_err;
2080 }
2081
2082 err = init_subsystems();
2083 if (err)
2084 goto out_hyp;
2085
2086 if (!in_hyp_mode) {
2087 err = finalize_hyp_mode();
2088 if (err) {
2089 kvm_err("Failed to finalize Hyp protection\n");
2090 goto out_hyp;
2091 }
2092 }
2093
2094 if (is_protected_kvm_enabled()) {
2095 kvm_info("Protected nVHE mode initialized successfully\n");
2096 } else if (in_hyp_mode) {
2097 kvm_info("VHE mode initialized successfully\n");
2098 } else {
2099 kvm_info("Hyp mode initialized successfully\n");
2100 }
2101
2102 return 0;
2103
2104 out_hyp:
2105 hyp_cpu_pm_exit();
2106 if (!in_hyp_mode)
2107 teardown_hyp_mode();
2108 out_err:
2109 return err;
2110 }
2111
2112 /* NOP: Compiling as a module not supported */
kvm_arch_exit(void)2113 void kvm_arch_exit(void)
2114 {
2115 kvm_perf_teardown();
2116 }
2117
early_kvm_mode_cfg(char * arg)2118 static int __init early_kvm_mode_cfg(char *arg)
2119 {
2120 if (!arg)
2121 return -EINVAL;
2122
2123 if (strcmp(arg, "protected") == 0) {
2124 kvm_mode = KVM_MODE_PROTECTED;
2125 return 0;
2126 }
2127
2128 if (strcmp(arg, "nvhe") == 0 && !WARN_ON(is_kernel_in_hyp_mode()))
2129 return 0;
2130
2131 return -EINVAL;
2132 }
2133 early_param("kvm-arm.mode", early_kvm_mode_cfg);
2134
kvm_get_mode(void)2135 enum kvm_mode kvm_get_mode(void)
2136 {
2137 return kvm_mode;
2138 }
2139
arm_init(void)2140 static int arm_init(void)
2141 {
2142 int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
2143 return rc;
2144 }
2145
2146 module_init(arm_init);
2147