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1 | /* | |
2 | * Copyright (C) 2012 - Virtual Open Systems and Columbia University | |
3 | * Author: Christoffer Dall <c.dall@virtualopensystems.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License, version 2, as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/cpu_pm.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/kvm_host.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/vmalloc.h> | |
25 | #include <linux/fs.h> | |
26 | #include <linux/mman.h> | |
27 | #include <linux/sched.h> | |
28 | #include <linux/kvm.h> | |
29 | #include <trace/events/kvm.h> | |
30 | #include <kvm/arm_pmu.h> | |
31 | ||
32 | #define CREATE_TRACE_POINTS | |
33 | #include "trace.h" | |
34 | ||
35 | #include <asm/uaccess.h> | |
36 | #include <asm/ptrace.h> | |
37 | #include <asm/mman.h> | |
38 | #include <asm/tlbflush.h> | |
39 | #include <asm/cacheflush.h> | |
40 | #include <asm/virt.h> | |
41 | #include <asm/kvm_arm.h> | |
42 | #include <asm/kvm_asm.h> | |
43 | #include <asm/kvm_mmu.h> | |
44 | #include <asm/kvm_emulate.h> | |
45 | #include <asm/kvm_coproc.h> | |
46 | #include <asm/kvm_psci.h> | |
47 | #include <asm/sections.h> | |
48 | ||
49 | #ifdef REQUIRES_VIRT | |
50 | __asm__(".arch_extension virt"); | |
51 | #endif | |
52 | ||
53 | static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); | |
54 | static kvm_cpu_context_t __percpu *kvm_host_cpu_state; | |
55 | static unsigned long hyp_default_vectors; | |
56 | ||
57 | /* Per-CPU variable containing the currently running vcpu. */ | |
58 | static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu); | |
59 | ||
60 | /* The VMID used in the VTTBR */ | |
61 | static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); | |
62 | static u32 kvm_next_vmid; | |
63 | static unsigned int kvm_vmid_bits __read_mostly; | |
64 | static DEFINE_SPINLOCK(kvm_vmid_lock); | |
65 | ||
66 | static bool vgic_present; | |
67 | ||
68 | static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled); | |
69 | ||
70 | static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu) | |
71 | { | |
72 | BUG_ON(preemptible()); | |
73 | __this_cpu_write(kvm_arm_running_vcpu, vcpu); | |
74 | } | |
75 | ||
76 | /** | |
77 | * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU. | |
78 | * Must be called from non-preemptible context | |
79 | */ | |
80 | struct kvm_vcpu *kvm_arm_get_running_vcpu(void) | |
81 | { | |
82 | BUG_ON(preemptible()); | |
83 | return __this_cpu_read(kvm_arm_running_vcpu); | |
84 | } | |
85 | ||
86 | /** | |
87 | * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus. | |
88 | */ | |
89 | struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void) | |
90 | { | |
91 | return &kvm_arm_running_vcpu; | |
92 | } | |
93 | ||
94 | int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) | |
95 | { | |
96 | return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; | |
97 | } | |
98 | ||
99 | int kvm_arch_hardware_setup(void) | |
100 | { | |
101 | return 0; | |
102 | } | |
103 | ||
104 | void kvm_arch_check_processor_compat(void *rtn) | |
105 | { | |
106 | *(int *)rtn = 0; | |
107 | } | |
108 | ||
109 | ||
110 | /** | |
111 | * kvm_arch_init_vm - initializes a VM data structure | |
112 | * @kvm: pointer to the KVM struct | |
113 | */ | |
114 | int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) | |
115 | { | |
116 | int ret = 0; | |
117 | ||
118 | if (type) | |
119 | return -EINVAL; | |
120 | ||
121 | ret = kvm_alloc_stage2_pgd(kvm); | |
122 | if (ret) | |
123 | goto out_fail_alloc; | |
124 | ||
125 | ret = create_hyp_mappings(kvm, kvm + 1); | |
126 | if (ret) | |
127 | goto out_free_stage2_pgd; | |
128 | ||
129 | kvm_vgic_early_init(kvm); | |
130 | kvm_timer_init(kvm); | |
131 | ||
132 | /* Mark the initial VMID generation invalid */ | |
133 | kvm->arch.vmid_gen = 0; | |
134 | ||
135 | /* The maximum number of VCPUs is limited by the host's GIC model */ | |
136 | kvm->arch.max_vcpus = vgic_present ? | |
137 | kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS; | |
138 | ||
139 | return ret; | |
140 | out_free_stage2_pgd: | |
141 | kvm_free_stage2_pgd(kvm); | |
142 | out_fail_alloc: | |
143 | return ret; | |
144 | } | |
145 | ||
146 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
147 | { | |
148 | return VM_FAULT_SIGBUS; | |
149 | } | |
150 | ||
151 | ||
152 | /** | |
153 | * kvm_arch_destroy_vm - destroy the VM data structure | |
154 | * @kvm: pointer to the KVM struct | |
155 | */ | |
156 | void kvm_arch_destroy_vm(struct kvm *kvm) | |
157 | { | |
158 | int i; | |
159 | ||
160 | kvm_free_stage2_pgd(kvm); | |
161 | ||
162 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { | |
163 | if (kvm->vcpus[i]) { | |
164 | kvm_arch_vcpu_free(kvm->vcpus[i]); | |
165 | kvm->vcpus[i] = NULL; | |
166 | } | |
167 | } | |
168 | ||
169 | kvm_vgic_destroy(kvm); | |
170 | } | |
171 | ||
172 | int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) | |
173 | { | |
174 | int r; | |
175 | switch (ext) { | |
176 | case KVM_CAP_IRQCHIP: | |
177 | r = vgic_present; | |
178 | break; | |
179 | case KVM_CAP_IOEVENTFD: | |
180 | case KVM_CAP_DEVICE_CTRL: | |
181 | case KVM_CAP_USER_MEMORY: | |
182 | case KVM_CAP_SYNC_MMU: | |
183 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
184 | case KVM_CAP_ONE_REG: | |
185 | case KVM_CAP_ARM_PSCI: | |
186 | case KVM_CAP_ARM_PSCI_0_2: | |
187 | case KVM_CAP_READONLY_MEM: | |
188 | case KVM_CAP_MP_STATE: | |
189 | r = 1; | |
190 | break; | |
191 | case KVM_CAP_COALESCED_MMIO: | |
192 | r = KVM_COALESCED_MMIO_PAGE_OFFSET; | |
193 | break; | |
194 | case KVM_CAP_ARM_SET_DEVICE_ADDR: | |
195 | r = 1; | |
196 | break; | |
197 | case KVM_CAP_NR_VCPUS: | |
198 | r = num_online_cpus(); | |
199 | break; | |
200 | case KVM_CAP_MAX_VCPUS: | |
201 | r = KVM_MAX_VCPUS; | |
202 | break; | |
203 | default: | |
204 | r = kvm_arch_dev_ioctl_check_extension(ext); | |
205 | break; | |
206 | } | |
207 | return r; | |
208 | } | |
209 | ||
210 | long kvm_arch_dev_ioctl(struct file *filp, | |
211 | unsigned int ioctl, unsigned long arg) | |
212 | { | |
213 | return -EINVAL; | |
214 | } | |
215 | ||
216 | ||
217 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) | |
218 | { | |
219 | int err; | |
220 | struct kvm_vcpu *vcpu; | |
221 | ||
222 | if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) { | |
223 | err = -EBUSY; | |
224 | goto out; | |
225 | } | |
226 | ||
227 | if (id >= kvm->arch.max_vcpus) { | |
228 | err = -EINVAL; | |
229 | goto out; | |
230 | } | |
231 | ||
232 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
233 | if (!vcpu) { | |
234 | err = -ENOMEM; | |
235 | goto out; | |
236 | } | |
237 | ||
238 | err = kvm_vcpu_init(vcpu, kvm, id); | |
239 | if (err) | |
240 | goto free_vcpu; | |
241 | ||
242 | err = create_hyp_mappings(vcpu, vcpu + 1); | |
243 | if (err) | |
244 | goto vcpu_uninit; | |
245 | ||
246 | return vcpu; | |
247 | vcpu_uninit: | |
248 | kvm_vcpu_uninit(vcpu); | |
249 | free_vcpu: | |
250 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
251 | out: | |
252 | return ERR_PTR(err); | |
253 | } | |
254 | ||
255 | void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) | |
256 | { | |
257 | kvm_vgic_vcpu_early_init(vcpu); | |
258 | } | |
259 | ||
260 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
261 | { | |
262 | kvm_mmu_free_memory_caches(vcpu); | |
263 | kvm_timer_vcpu_terminate(vcpu); | |
264 | kvm_vgic_vcpu_destroy(vcpu); | |
265 | kvm_pmu_vcpu_destroy(vcpu); | |
266 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
267 | } | |
268 | ||
269 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
270 | { | |
271 | kvm_arch_vcpu_free(vcpu); | |
272 | } | |
273 | ||
274 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
275 | { | |
276 | return kvm_timer_should_fire(vcpu); | |
277 | } | |
278 | ||
279 | void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) | |
280 | { | |
281 | kvm_timer_schedule(vcpu); | |
282 | } | |
283 | ||
284 | void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) | |
285 | { | |
286 | kvm_timer_unschedule(vcpu); | |
287 | } | |
288 | ||
289 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) | |
290 | { | |
291 | /* Force users to call KVM_ARM_VCPU_INIT */ | |
292 | vcpu->arch.target = -1; | |
293 | bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); | |
294 | ||
295 | /* Set up the timer */ | |
296 | kvm_timer_vcpu_init(vcpu); | |
297 | ||
298 | kvm_arm_reset_debug_ptr(vcpu); | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
304 | { | |
305 | vcpu->cpu = cpu; | |
306 | vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state); | |
307 | ||
308 | kvm_arm_set_running_vcpu(vcpu); | |
309 | } | |
310 | ||
311 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
312 | { | |
313 | /* | |
314 | * The arch-generic KVM code expects the cpu field of a vcpu to be -1 | |
315 | * if the vcpu is no longer assigned to a cpu. This is used for the | |
316 | * optimized make_all_cpus_request path. | |
317 | */ | |
318 | vcpu->cpu = -1; | |
319 | ||
320 | kvm_arm_set_running_vcpu(NULL); | |
321 | kvm_timer_vcpu_put(vcpu); | |
322 | } | |
323 | ||
324 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, | |
325 | struct kvm_mp_state *mp_state) | |
326 | { | |
327 | if (vcpu->arch.power_off) | |
328 | mp_state->mp_state = KVM_MP_STATE_STOPPED; | |
329 | else | |
330 | mp_state->mp_state = KVM_MP_STATE_RUNNABLE; | |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
336 | struct kvm_mp_state *mp_state) | |
337 | { | |
338 | switch (mp_state->mp_state) { | |
339 | case KVM_MP_STATE_RUNNABLE: | |
340 | vcpu->arch.power_off = false; | |
341 | break; | |
342 | case KVM_MP_STATE_STOPPED: | |
343 | vcpu->arch.power_off = true; | |
344 | break; | |
345 | default: | |
346 | return -EINVAL; | |
347 | } | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
352 | /** | |
353 | * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled | |
354 | * @v: The VCPU pointer | |
355 | * | |
356 | * If the guest CPU is not waiting for interrupts or an interrupt line is | |
357 | * asserted, the CPU is by definition runnable. | |
358 | */ | |
359 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) | |
360 | { | |
361 | return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v)) | |
362 | && !v->arch.power_off && !v->arch.pause); | |
363 | } | |
364 | ||
365 | /* Just ensure a guest exit from a particular CPU */ | |
366 | static void exit_vm_noop(void *info) | |
367 | { | |
368 | } | |
369 | ||
370 | void force_vm_exit(const cpumask_t *mask) | |
371 | { | |
372 | preempt_disable(); | |
373 | smp_call_function_many(mask, exit_vm_noop, NULL, true); | |
374 | preempt_enable(); | |
375 | } | |
376 | ||
377 | /** | |
378 | * need_new_vmid_gen - check that the VMID is still valid | |
379 | * @kvm: The VM's VMID to checkt | |
380 | * | |
381 | * return true if there is a new generation of VMIDs being used | |
382 | * | |
383 | * The hardware supports only 256 values with the value zero reserved for the | |
384 | * host, so we check if an assigned value belongs to a previous generation, | |
385 | * which which requires us to assign a new value. If we're the first to use a | |
386 | * VMID for the new generation, we must flush necessary caches and TLBs on all | |
387 | * CPUs. | |
388 | */ | |
389 | static bool need_new_vmid_gen(struct kvm *kvm) | |
390 | { | |
391 | return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); | |
392 | } | |
393 | ||
394 | /** | |
395 | * update_vttbr - Update the VTTBR with a valid VMID before the guest runs | |
396 | * @kvm The guest that we are about to run | |
397 | * | |
398 | * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the | |
399 | * VM has a valid VMID, otherwise assigns a new one and flushes corresponding | |
400 | * caches and TLBs. | |
401 | */ | |
402 | static void update_vttbr(struct kvm *kvm) | |
403 | { | |
404 | phys_addr_t pgd_phys; | |
405 | u64 vmid; | |
406 | ||
407 | if (!need_new_vmid_gen(kvm)) | |
408 | return; | |
409 | ||
410 | spin_lock(&kvm_vmid_lock); | |
411 | ||
412 | /* | |
413 | * We need to re-check the vmid_gen here to ensure that if another vcpu | |
414 | * already allocated a valid vmid for this vm, then this vcpu should | |
415 | * use the same vmid. | |
416 | */ | |
417 | if (!need_new_vmid_gen(kvm)) { | |
418 | spin_unlock(&kvm_vmid_lock); | |
419 | return; | |
420 | } | |
421 | ||
422 | /* First user of a new VMID generation? */ | |
423 | if (unlikely(kvm_next_vmid == 0)) { | |
424 | atomic64_inc(&kvm_vmid_gen); | |
425 | kvm_next_vmid = 1; | |
426 | ||
427 | /* | |
428 | * On SMP we know no other CPUs can use this CPU's or each | |
429 | * other's VMID after force_vm_exit returns since the | |
430 | * kvm_vmid_lock blocks them from reentry to the guest. | |
431 | */ | |
432 | force_vm_exit(cpu_all_mask); | |
433 | /* | |
434 | * Now broadcast TLB + ICACHE invalidation over the inner | |
435 | * shareable domain to make sure all data structures are | |
436 | * clean. | |
437 | */ | |
438 | kvm_call_hyp(__kvm_flush_vm_context); | |
439 | } | |
440 | ||
441 | kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); | |
442 | kvm->arch.vmid = kvm_next_vmid; | |
443 | kvm_next_vmid++; | |
444 | kvm_next_vmid &= (1 << kvm_vmid_bits) - 1; | |
445 | ||
446 | /* update vttbr to be used with the new vmid */ | |
447 | pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm)); | |
448 | BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK); | |
449 | vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits); | |
450 | kvm->arch.vttbr = pgd_phys | vmid; | |
451 | ||
452 | spin_unlock(&kvm_vmid_lock); | |
453 | } | |
454 | ||
455 | static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) | |
456 | { | |
457 | struct kvm *kvm = vcpu->kvm; | |
458 | int ret; | |
459 | ||
460 | if (likely(vcpu->arch.has_run_once)) | |
461 | return 0; | |
462 | ||
463 | vcpu->arch.has_run_once = true; | |
464 | ||
465 | /* | |
466 | * Map the VGIC hardware resources before running a vcpu the first | |
467 | * time on this VM. | |
468 | */ | |
469 | if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) { | |
470 | ret = kvm_vgic_map_resources(kvm); | |
471 | if (ret) | |
472 | return ret; | |
473 | } | |
474 | ||
475 | /* | |
476 | * Enable the arch timers only if we have an in-kernel VGIC | |
477 | * and it has been properly initialized, since we cannot handle | |
478 | * interrupts from the virtual timer with a userspace gic. | |
479 | */ | |
480 | if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) | |
481 | kvm_timer_enable(kvm); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | bool kvm_arch_intc_initialized(struct kvm *kvm) | |
487 | { | |
488 | return vgic_initialized(kvm); | |
489 | } | |
490 | ||
491 | static void kvm_arm_halt_guest(struct kvm *kvm) __maybe_unused; | |
492 | static void kvm_arm_resume_guest(struct kvm *kvm) __maybe_unused; | |
493 | ||
494 | static void kvm_arm_halt_guest(struct kvm *kvm) | |
495 | { | |
496 | int i; | |
497 | struct kvm_vcpu *vcpu; | |
498 | ||
499 | kvm_for_each_vcpu(i, vcpu, kvm) | |
500 | vcpu->arch.pause = true; | |
501 | force_vm_exit(cpu_all_mask); | |
502 | } | |
503 | ||
504 | static void kvm_arm_resume_guest(struct kvm *kvm) | |
505 | { | |
506 | int i; | |
507 | struct kvm_vcpu *vcpu; | |
508 | ||
509 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
510 | struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu); | |
511 | ||
512 | vcpu->arch.pause = false; | |
513 | swake_up(wq); | |
514 | } | |
515 | } | |
516 | ||
517 | static void vcpu_sleep(struct kvm_vcpu *vcpu) | |
518 | { | |
519 | struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu); | |
520 | ||
521 | swait_event_interruptible(*wq, ((!vcpu->arch.power_off) && | |
522 | (!vcpu->arch.pause))); | |
523 | } | |
524 | ||
525 | static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) | |
526 | { | |
527 | return vcpu->arch.target >= 0; | |
528 | } | |
529 | ||
530 | /** | |
531 | * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code | |
532 | * @vcpu: The VCPU pointer | |
533 | * @run: The kvm_run structure pointer used for userspace state exchange | |
534 | * | |
535 | * This function is called through the VCPU_RUN ioctl called from user space. It | |
536 | * will execute VM code in a loop until the time slice for the process is used | |
537 | * or some emulation is needed from user space in which case the function will | |
538 | * return with return value 0 and with the kvm_run structure filled in with the | |
539 | * required data for the requested emulation. | |
540 | */ | |
541 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) | |
542 | { | |
543 | int ret; | |
544 | sigset_t sigsaved; | |
545 | ||
546 | if (unlikely(!kvm_vcpu_initialized(vcpu))) | |
547 | return -ENOEXEC; | |
548 | ||
549 | ret = kvm_vcpu_first_run_init(vcpu); | |
550 | if (ret) | |
551 | return ret; | |
552 | ||
553 | if (run->exit_reason == KVM_EXIT_MMIO) { | |
554 | ret = kvm_handle_mmio_return(vcpu, vcpu->run); | |
555 | if (ret) | |
556 | return ret; | |
557 | } | |
558 | ||
559 | if (vcpu->sigset_active) | |
560 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
561 | ||
562 | ret = 1; | |
563 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
564 | while (ret > 0) { | |
565 | /* | |
566 | * Check conditions before entering the guest | |
567 | */ | |
568 | cond_resched(); | |
569 | ||
570 | update_vttbr(vcpu->kvm); | |
571 | ||
572 | if (vcpu->arch.power_off || vcpu->arch.pause) | |
573 | vcpu_sleep(vcpu); | |
574 | ||
575 | /* | |
576 | * Preparing the interrupts to be injected also | |
577 | * involves poking the GIC, which must be done in a | |
578 | * non-preemptible context. | |
579 | */ | |
580 | preempt_disable(); | |
581 | kvm_pmu_flush_hwstate(vcpu); | |
582 | kvm_timer_flush_hwstate(vcpu); | |
583 | kvm_vgic_flush_hwstate(vcpu); | |
584 | ||
585 | local_irq_disable(); | |
586 | ||
587 | /* | |
588 | * Re-check atomic conditions | |
589 | */ | |
590 | if (signal_pending(current)) { | |
591 | ret = -EINTR; | |
592 | run->exit_reason = KVM_EXIT_INTR; | |
593 | } | |
594 | ||
595 | if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) || | |
596 | vcpu->arch.power_off || vcpu->arch.pause) { | |
597 | local_irq_enable(); | |
598 | kvm_pmu_sync_hwstate(vcpu); | |
599 | kvm_timer_sync_hwstate(vcpu); | |
600 | kvm_vgic_sync_hwstate(vcpu); | |
601 | preempt_enable(); | |
602 | continue; | |
603 | } | |
604 | ||
605 | kvm_arm_setup_debug(vcpu); | |
606 | ||
607 | /************************************************************** | |
608 | * Enter the guest | |
609 | */ | |
610 | trace_kvm_entry(*vcpu_pc(vcpu)); | |
611 | __kvm_guest_enter(); | |
612 | vcpu->mode = IN_GUEST_MODE; | |
613 | ||
614 | ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); | |
615 | ||
616 | vcpu->mode = OUTSIDE_GUEST_MODE; | |
617 | vcpu->stat.exits++; | |
618 | /* | |
619 | * Back from guest | |
620 | *************************************************************/ | |
621 | ||
622 | kvm_arm_clear_debug(vcpu); | |
623 | ||
624 | /* | |
625 | * We may have taken a host interrupt in HYP mode (ie | |
626 | * while executing the guest). This interrupt is still | |
627 | * pending, as we haven't serviced it yet! | |
628 | * | |
629 | * We're now back in SVC mode, with interrupts | |
630 | * disabled. Enabling the interrupts now will have | |
631 | * the effect of taking the interrupt again, in SVC | |
632 | * mode this time. | |
633 | */ | |
634 | local_irq_enable(); | |
635 | ||
636 | /* | |
637 | * We do local_irq_enable() before calling kvm_guest_exit() so | |
638 | * that if a timer interrupt hits while running the guest we | |
639 | * account that tick as being spent in the guest. We enable | |
640 | * preemption after calling kvm_guest_exit() so that if we get | |
641 | * preempted we make sure ticks after that is not counted as | |
642 | * guest time. | |
643 | */ | |
644 | kvm_guest_exit(); | |
645 | trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu)); | |
646 | ||
647 | /* | |
648 | * We must sync the PMU and timer state before the vgic state so | |
649 | * that the vgic can properly sample the updated state of the | |
650 | * interrupt line. | |
651 | */ | |
652 | kvm_pmu_sync_hwstate(vcpu); | |
653 | kvm_timer_sync_hwstate(vcpu); | |
654 | ||
655 | kvm_vgic_sync_hwstate(vcpu); | |
656 | ||
657 | preempt_enable(); | |
658 | ||
659 | ret = handle_exit(vcpu, run, ret); | |
660 | } | |
661 | ||
662 | if (vcpu->sigset_active) | |
663 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
664 | return ret; | |
665 | } | |
666 | ||
667 | static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) | |
668 | { | |
669 | int bit_index; | |
670 | bool set; | |
671 | unsigned long *ptr; | |
672 | ||
673 | if (number == KVM_ARM_IRQ_CPU_IRQ) | |
674 | bit_index = __ffs(HCR_VI); | |
675 | else /* KVM_ARM_IRQ_CPU_FIQ */ | |
676 | bit_index = __ffs(HCR_VF); | |
677 | ||
678 | ptr = (unsigned long *)&vcpu->arch.irq_lines; | |
679 | if (level) | |
680 | set = test_and_set_bit(bit_index, ptr); | |
681 | else | |
682 | set = test_and_clear_bit(bit_index, ptr); | |
683 | ||
684 | /* | |
685 | * If we didn't change anything, no need to wake up or kick other CPUs | |
686 | */ | |
687 | if (set == level) | |
688 | return 0; | |
689 | ||
690 | /* | |
691 | * The vcpu irq_lines field was updated, wake up sleeping VCPUs and | |
692 | * trigger a world-switch round on the running physical CPU to set the | |
693 | * virtual IRQ/FIQ fields in the HCR appropriately. | |
694 | */ | |
695 | kvm_vcpu_kick(vcpu); | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, | |
701 | bool line_status) | |
702 | { | |
703 | u32 irq = irq_level->irq; | |
704 | unsigned int irq_type, vcpu_idx, irq_num; | |
705 | int nrcpus = atomic_read(&kvm->online_vcpus); | |
706 | struct kvm_vcpu *vcpu = NULL; | |
707 | bool level = irq_level->level; | |
708 | ||
709 | irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; | |
710 | vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; | |
711 | irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; | |
712 | ||
713 | trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); | |
714 | ||
715 | switch (irq_type) { | |
716 | case KVM_ARM_IRQ_TYPE_CPU: | |
717 | if (irqchip_in_kernel(kvm)) | |
718 | return -ENXIO; | |
719 | ||
720 | if (vcpu_idx >= nrcpus) | |
721 | return -EINVAL; | |
722 | ||
723 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); | |
724 | if (!vcpu) | |
725 | return -EINVAL; | |
726 | ||
727 | if (irq_num > KVM_ARM_IRQ_CPU_FIQ) | |
728 | return -EINVAL; | |
729 | ||
730 | return vcpu_interrupt_line(vcpu, irq_num, level); | |
731 | case KVM_ARM_IRQ_TYPE_PPI: | |
732 | if (!irqchip_in_kernel(kvm)) | |
733 | return -ENXIO; | |
734 | ||
735 | if (vcpu_idx >= nrcpus) | |
736 | return -EINVAL; | |
737 | ||
738 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); | |
739 | if (!vcpu) | |
740 | return -EINVAL; | |
741 | ||
742 | if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) | |
743 | return -EINVAL; | |
744 | ||
745 | return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); | |
746 | case KVM_ARM_IRQ_TYPE_SPI: | |
747 | if (!irqchip_in_kernel(kvm)) | |
748 | return -ENXIO; | |
749 | ||
750 | if (irq_num < VGIC_NR_PRIVATE_IRQS) | |
751 | return -EINVAL; | |
752 | ||
753 | return kvm_vgic_inject_irq(kvm, 0, irq_num, level); | |
754 | } | |
755 | ||
756 | return -EINVAL; | |
757 | } | |
758 | ||
759 | static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, | |
760 | const struct kvm_vcpu_init *init) | |
761 | { | |
762 | unsigned int i; | |
763 | int phys_target = kvm_target_cpu(); | |
764 | ||
765 | if (init->target != phys_target) | |
766 | return -EINVAL; | |
767 | ||
768 | /* | |
769 | * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must | |
770 | * use the same target. | |
771 | */ | |
772 | if (vcpu->arch.target != -1 && vcpu->arch.target != init->target) | |
773 | return -EINVAL; | |
774 | ||
775 | /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ | |
776 | for (i = 0; i < sizeof(init->features) * 8; i++) { | |
777 | bool set = (init->features[i / 32] & (1 << (i % 32))); | |
778 | ||
779 | if (set && i >= KVM_VCPU_MAX_FEATURES) | |
780 | return -ENOENT; | |
781 | ||
782 | /* | |
783 | * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must | |
784 | * use the same feature set. | |
785 | */ | |
786 | if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES && | |
787 | test_bit(i, vcpu->arch.features) != set) | |
788 | return -EINVAL; | |
789 | ||
790 | if (set) | |
791 | set_bit(i, vcpu->arch.features); | |
792 | } | |
793 | ||
794 | vcpu->arch.target = phys_target; | |
795 | ||
796 | /* Now we know what it is, we can reset it. */ | |
797 | return kvm_reset_vcpu(vcpu); | |
798 | } | |
799 | ||
800 | ||
801 | static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, | |
802 | struct kvm_vcpu_init *init) | |
803 | { | |
804 | int ret; | |
805 | ||
806 | ret = kvm_vcpu_set_target(vcpu, init); | |
807 | if (ret) | |
808 | return ret; | |
809 | ||
810 | /* | |
811 | * Ensure a rebooted VM will fault in RAM pages and detect if the | |
812 | * guest MMU is turned off and flush the caches as needed. | |
813 | */ | |
814 | if (vcpu->arch.has_run_once) | |
815 | stage2_unmap_vm(vcpu->kvm); | |
816 | ||
817 | vcpu_reset_hcr(vcpu); | |
818 | ||
819 | /* | |
820 | * Handle the "start in power-off" case. | |
821 | */ | |
822 | if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) | |
823 | vcpu->arch.power_off = true; | |
824 | else | |
825 | vcpu->arch.power_off = false; | |
826 | ||
827 | return 0; | |
828 | } | |
829 | ||
830 | static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu, | |
831 | struct kvm_device_attr *attr) | |
832 | { | |
833 | int ret = -ENXIO; | |
834 | ||
835 | switch (attr->group) { | |
836 | default: | |
837 | ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr); | |
838 | break; | |
839 | } | |
840 | ||
841 | return ret; | |
842 | } | |
843 | ||
844 | static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu, | |
845 | struct kvm_device_attr *attr) | |
846 | { | |
847 | int ret = -ENXIO; | |
848 | ||
849 | switch (attr->group) { | |
850 | default: | |
851 | ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr); | |
852 | break; | |
853 | } | |
854 | ||
855 | return ret; | |
856 | } | |
857 | ||
858 | static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu, | |
859 | struct kvm_device_attr *attr) | |
860 | { | |
861 | int ret = -ENXIO; | |
862 | ||
863 | switch (attr->group) { | |
864 | default: | |
865 | ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr); | |
866 | break; | |
867 | } | |
868 | ||
869 | return ret; | |
870 | } | |
871 | ||
872 | long kvm_arch_vcpu_ioctl(struct file *filp, | |
873 | unsigned int ioctl, unsigned long arg) | |
874 | { | |
875 | struct kvm_vcpu *vcpu = filp->private_data; | |
876 | void __user *argp = (void __user *)arg; | |
877 | struct kvm_device_attr attr; | |
878 | ||
879 | switch (ioctl) { | |
880 | case KVM_ARM_VCPU_INIT: { | |
881 | struct kvm_vcpu_init init; | |
882 | ||
883 | if (copy_from_user(&init, argp, sizeof(init))) | |
884 | return -EFAULT; | |
885 | ||
886 | return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); | |
887 | } | |
888 | case KVM_SET_ONE_REG: | |
889 | case KVM_GET_ONE_REG: { | |
890 | struct kvm_one_reg reg; | |
891 | ||
892 | if (unlikely(!kvm_vcpu_initialized(vcpu))) | |
893 | return -ENOEXEC; | |
894 | ||
895 | if (copy_from_user(®, argp, sizeof(reg))) | |
896 | return -EFAULT; | |
897 | if (ioctl == KVM_SET_ONE_REG) | |
898 | return kvm_arm_set_reg(vcpu, ®); | |
899 | else | |
900 | return kvm_arm_get_reg(vcpu, ®); | |
901 | } | |
902 | case KVM_GET_REG_LIST: { | |
903 | struct kvm_reg_list __user *user_list = argp; | |
904 | struct kvm_reg_list reg_list; | |
905 | unsigned n; | |
906 | ||
907 | if (unlikely(!kvm_vcpu_initialized(vcpu))) | |
908 | return -ENOEXEC; | |
909 | ||
910 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) | |
911 | return -EFAULT; | |
912 | n = reg_list.n; | |
913 | reg_list.n = kvm_arm_num_regs(vcpu); | |
914 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) | |
915 | return -EFAULT; | |
916 | if (n < reg_list.n) | |
917 | return -E2BIG; | |
918 | return kvm_arm_copy_reg_indices(vcpu, user_list->reg); | |
919 | } | |
920 | case KVM_SET_DEVICE_ATTR: { | |
921 | if (copy_from_user(&attr, argp, sizeof(attr))) | |
922 | return -EFAULT; | |
923 | return kvm_arm_vcpu_set_attr(vcpu, &attr); | |
924 | } | |
925 | case KVM_GET_DEVICE_ATTR: { | |
926 | if (copy_from_user(&attr, argp, sizeof(attr))) | |
927 | return -EFAULT; | |
928 | return kvm_arm_vcpu_get_attr(vcpu, &attr); | |
929 | } | |
930 | case KVM_HAS_DEVICE_ATTR: { | |
931 | if (copy_from_user(&attr, argp, sizeof(attr))) | |
932 | return -EFAULT; | |
933 | return kvm_arm_vcpu_has_attr(vcpu, &attr); | |
934 | } | |
935 | default: | |
936 | return -EINVAL; | |
937 | } | |
938 | } | |
939 | ||
940 | /** | |
941 | * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot | |
942 | * @kvm: kvm instance | |
943 | * @log: slot id and address to which we copy the log | |
944 | * | |
945 | * Steps 1-4 below provide general overview of dirty page logging. See | |
946 | * kvm_get_dirty_log_protect() function description for additional details. | |
947 | * | |
948 | * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we | |
949 | * always flush the TLB (step 4) even if previous step failed and the dirty | |
950 | * bitmap may be corrupt. Regardless of previous outcome the KVM logging API | |
951 | * does not preclude user space subsequent dirty log read. Flushing TLB ensures | |
952 | * writes will be marked dirty for next log read. | |
953 | * | |
954 | * 1. Take a snapshot of the bit and clear it if needed. | |
955 | * 2. Write protect the corresponding page. | |
956 | * 3. Copy the snapshot to the userspace. | |
957 | * 4. Flush TLB's if needed. | |
958 | */ | |
959 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) | |
960 | { | |
961 | bool is_dirty = false; | |
962 | int r; | |
963 | ||
964 | mutex_lock(&kvm->slots_lock); | |
965 | ||
966 | r = kvm_get_dirty_log_protect(kvm, log, &is_dirty); | |
967 | ||
968 | if (is_dirty) | |
969 | kvm_flush_remote_tlbs(kvm); | |
970 | ||
971 | mutex_unlock(&kvm->slots_lock); | |
972 | return r; | |
973 | } | |
974 | ||
975 | static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, | |
976 | struct kvm_arm_device_addr *dev_addr) | |
977 | { | |
978 | unsigned long dev_id, type; | |
979 | ||
980 | dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> | |
981 | KVM_ARM_DEVICE_ID_SHIFT; | |
982 | type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> | |
983 | KVM_ARM_DEVICE_TYPE_SHIFT; | |
984 | ||
985 | switch (dev_id) { | |
986 | case KVM_ARM_DEVICE_VGIC_V2: | |
987 | if (!vgic_present) | |
988 | return -ENXIO; | |
989 | return kvm_vgic_addr(kvm, type, &dev_addr->addr, true); | |
990 | default: | |
991 | return -ENODEV; | |
992 | } | |
993 | } | |
994 | ||
995 | long kvm_arch_vm_ioctl(struct file *filp, | |
996 | unsigned int ioctl, unsigned long arg) | |
997 | { | |
998 | struct kvm *kvm = filp->private_data; | |
999 | void __user *argp = (void __user *)arg; | |
1000 | ||
1001 | switch (ioctl) { | |
1002 | case KVM_CREATE_IRQCHIP: { | |
1003 | if (!vgic_present) | |
1004 | return -ENXIO; | |
1005 | return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2); | |
1006 | } | |
1007 | case KVM_ARM_SET_DEVICE_ADDR: { | |
1008 | struct kvm_arm_device_addr dev_addr; | |
1009 | ||
1010 | if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) | |
1011 | return -EFAULT; | |
1012 | return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); | |
1013 | } | |
1014 | case KVM_ARM_PREFERRED_TARGET: { | |
1015 | int err; | |
1016 | struct kvm_vcpu_init init; | |
1017 | ||
1018 | err = kvm_vcpu_preferred_target(&init); | |
1019 | if (err) | |
1020 | return err; | |
1021 | ||
1022 | if (copy_to_user(argp, &init, sizeof(init))) | |
1023 | return -EFAULT; | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | default: | |
1028 | return -EINVAL; | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | static void cpu_init_hyp_mode(void *dummy) | |
1033 | { | |
1034 | phys_addr_t boot_pgd_ptr; | |
1035 | phys_addr_t pgd_ptr; | |
1036 | unsigned long hyp_stack_ptr; | |
1037 | unsigned long stack_page; | |
1038 | unsigned long vector_ptr; | |
1039 | ||
1040 | /* Switch from the HYP stub to our own HYP init vector */ | |
1041 | __hyp_set_vectors(kvm_get_idmap_vector()); | |
1042 | ||
1043 | boot_pgd_ptr = kvm_mmu_get_boot_httbr(); | |
1044 | pgd_ptr = kvm_mmu_get_httbr(); | |
1045 | stack_page = __this_cpu_read(kvm_arm_hyp_stack_page); | |
1046 | hyp_stack_ptr = stack_page + PAGE_SIZE; | |
1047 | vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector); | |
1048 | ||
1049 | __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr); | |
1050 | __cpu_init_stage2(); | |
1051 | ||
1052 | kvm_arm_init_debug(); | |
1053 | } | |
1054 | ||
1055 | static void cpu_hyp_reinit(void) | |
1056 | { | |
1057 | if (is_kernel_in_hyp_mode()) { | |
1058 | /* | |
1059 | * __cpu_init_stage2() is safe to call even if the PM | |
1060 | * event was cancelled before the CPU was reset. | |
1061 | */ | |
1062 | __cpu_init_stage2(); | |
1063 | } else { | |
1064 | if (__hyp_get_vectors() == hyp_default_vectors) | |
1065 | cpu_init_hyp_mode(NULL); | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | static void cpu_hyp_reset(void) | |
1070 | { | |
1071 | phys_addr_t boot_pgd_ptr; | |
1072 | phys_addr_t phys_idmap_start; | |
1073 | ||
1074 | if (!is_kernel_in_hyp_mode()) { | |
1075 | boot_pgd_ptr = kvm_mmu_get_boot_httbr(); | |
1076 | phys_idmap_start = kvm_get_idmap_start(); | |
1077 | ||
1078 | __cpu_reset_hyp_mode(boot_pgd_ptr, phys_idmap_start); | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | static void _kvm_arch_hardware_enable(void *discard) | |
1083 | { | |
1084 | if (!__this_cpu_read(kvm_arm_hardware_enabled)) { | |
1085 | cpu_hyp_reinit(); | |
1086 | __this_cpu_write(kvm_arm_hardware_enabled, 1); | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | int kvm_arch_hardware_enable(void) | |
1091 | { | |
1092 | _kvm_arch_hardware_enable(NULL); | |
1093 | return 0; | |
1094 | } | |
1095 | ||
1096 | static void _kvm_arch_hardware_disable(void *discard) | |
1097 | { | |
1098 | if (__this_cpu_read(kvm_arm_hardware_enabled)) { | |
1099 | cpu_hyp_reset(); | |
1100 | __this_cpu_write(kvm_arm_hardware_enabled, 0); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | void kvm_arch_hardware_disable(void) | |
1105 | { | |
1106 | _kvm_arch_hardware_disable(NULL); | |
1107 | } | |
1108 | ||
1109 | #ifdef CONFIG_CPU_PM | |
1110 | static int hyp_init_cpu_pm_notifier(struct notifier_block *self, | |
1111 | unsigned long cmd, | |
1112 | void *v) | |
1113 | { | |
1114 | /* | |
1115 | * kvm_arm_hardware_enabled is left with its old value over | |
1116 | * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should | |
1117 | * re-enable hyp. | |
1118 | */ | |
1119 | switch (cmd) { | |
1120 | case CPU_PM_ENTER: | |
1121 | if (__this_cpu_read(kvm_arm_hardware_enabled)) | |
1122 | /* | |
1123 | * don't update kvm_arm_hardware_enabled here | |
1124 | * so that the hardware will be re-enabled | |
1125 | * when we resume. See below. | |
1126 | */ | |
1127 | cpu_hyp_reset(); | |
1128 | ||
1129 | return NOTIFY_OK; | |
1130 | case CPU_PM_EXIT: | |
1131 | if (__this_cpu_read(kvm_arm_hardware_enabled)) | |
1132 | /* The hardware was enabled before suspend. */ | |
1133 | cpu_hyp_reinit(); | |
1134 | ||
1135 | return NOTIFY_OK; | |
1136 | ||
1137 | default: | |
1138 | return NOTIFY_DONE; | |
1139 | } | |
1140 | } | |
1141 | ||
1142 | static struct notifier_block hyp_init_cpu_pm_nb = { | |
1143 | .notifier_call = hyp_init_cpu_pm_notifier, | |
1144 | }; | |
1145 | ||
1146 | static void __init hyp_cpu_pm_init(void) | |
1147 | { | |
1148 | cpu_pm_register_notifier(&hyp_init_cpu_pm_nb); | |
1149 | } | |
1150 | static void __init hyp_cpu_pm_exit(void) | |
1151 | { | |
1152 | cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb); | |
1153 | } | |
1154 | #else | |
1155 | static inline void hyp_cpu_pm_init(void) | |
1156 | { | |
1157 | } | |
1158 | static inline void hyp_cpu_pm_exit(void) | |
1159 | { | |
1160 | } | |
1161 | #endif | |
1162 | ||
1163 | static void teardown_common_resources(void) | |
1164 | { | |
1165 | free_percpu(kvm_host_cpu_state); | |
1166 | } | |
1167 | ||
1168 | static int init_common_resources(void) | |
1169 | { | |
1170 | kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t); | |
1171 | if (!kvm_host_cpu_state) { | |
1172 | kvm_err("Cannot allocate host CPU state\n"); | |
1173 | return -ENOMEM; | |
1174 | } | |
1175 | ||
1176 | return 0; | |
1177 | } | |
1178 | ||
1179 | static int init_subsystems(void) | |
1180 | { | |
1181 | int err = 0; | |
1182 | ||
1183 | /* | |
1184 | * Enable hardware so that subsystem initialisation can access EL2. | |
1185 | */ | |
1186 | on_each_cpu(_kvm_arch_hardware_enable, NULL, 1); | |
1187 | ||
1188 | /* | |
1189 | * Register CPU lower-power notifier | |
1190 | */ | |
1191 | hyp_cpu_pm_init(); | |
1192 | ||
1193 | /* | |
1194 | * Init HYP view of VGIC | |
1195 | */ | |
1196 | err = kvm_vgic_hyp_init(); | |
1197 | switch (err) { | |
1198 | case 0: | |
1199 | vgic_present = true; | |
1200 | break; | |
1201 | case -ENODEV: | |
1202 | case -ENXIO: | |
1203 | vgic_present = false; | |
1204 | err = 0; | |
1205 | break; | |
1206 | default: | |
1207 | goto out; | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Init HYP architected timer support | |
1212 | */ | |
1213 | err = kvm_timer_hyp_init(); | |
1214 | if (err) | |
1215 | goto out; | |
1216 | ||
1217 | kvm_perf_init(); | |
1218 | kvm_coproc_table_init(); | |
1219 | ||
1220 | out: | |
1221 | on_each_cpu(_kvm_arch_hardware_disable, NULL, 1); | |
1222 | ||
1223 | return err; | |
1224 | } | |
1225 | ||
1226 | static void teardown_hyp_mode(void) | |
1227 | { | |
1228 | int cpu; | |
1229 | ||
1230 | if (is_kernel_in_hyp_mode()) | |
1231 | return; | |
1232 | ||
1233 | free_hyp_pgds(); | |
1234 | for_each_possible_cpu(cpu) | |
1235 | free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); | |
1236 | hyp_cpu_pm_exit(); | |
1237 | } | |
1238 | ||
1239 | static int init_vhe_mode(void) | |
1240 | { | |
1241 | /* set size of VMID supported by CPU */ | |
1242 | kvm_vmid_bits = kvm_get_vmid_bits(); | |
1243 | kvm_info("%d-bit VMID\n", kvm_vmid_bits); | |
1244 | ||
1245 | kvm_info("VHE mode initialized successfully\n"); | |
1246 | return 0; | |
1247 | } | |
1248 | ||
1249 | /** | |
1250 | * Inits Hyp-mode on all online CPUs | |
1251 | */ | |
1252 | static int init_hyp_mode(void) | |
1253 | { | |
1254 | int cpu; | |
1255 | int err = 0; | |
1256 | ||
1257 | /* | |
1258 | * Allocate Hyp PGD and setup Hyp identity mapping | |
1259 | */ | |
1260 | err = kvm_mmu_init(); | |
1261 | if (err) | |
1262 | goto out_err; | |
1263 | ||
1264 | /* | |
1265 | * It is probably enough to obtain the default on one | |
1266 | * CPU. It's unlikely to be different on the others. | |
1267 | */ | |
1268 | hyp_default_vectors = __hyp_get_vectors(); | |
1269 | ||
1270 | /* | |
1271 | * Allocate stack pages for Hypervisor-mode | |
1272 | */ | |
1273 | for_each_possible_cpu(cpu) { | |
1274 | unsigned long stack_page; | |
1275 | ||
1276 | stack_page = __get_free_page(GFP_KERNEL); | |
1277 | if (!stack_page) { | |
1278 | err = -ENOMEM; | |
1279 | goto out_err; | |
1280 | } | |
1281 | ||
1282 | per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; | |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | * Map the Hyp-code called directly from the host | |
1287 | */ | |
1288 | err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start), | |
1289 | kvm_ksym_ref(__hyp_text_end)); | |
1290 | if (err) { | |
1291 | kvm_err("Cannot map world-switch code\n"); | |
1292 | goto out_err; | |
1293 | } | |
1294 | ||
1295 | err = create_hyp_mappings(kvm_ksym_ref(__start_rodata), | |
1296 | kvm_ksym_ref(__end_rodata)); | |
1297 | if (err) { | |
1298 | kvm_err("Cannot map rodata section\n"); | |
1299 | goto out_err; | |
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Map the Hyp stack pages | |
1304 | */ | |
1305 | for_each_possible_cpu(cpu) { | |
1306 | char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); | |
1307 | err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE); | |
1308 | ||
1309 | if (err) { | |
1310 | kvm_err("Cannot map hyp stack\n"); | |
1311 | goto out_err; | |
1312 | } | |
1313 | } | |
1314 | ||
1315 | for_each_possible_cpu(cpu) { | |
1316 | kvm_cpu_context_t *cpu_ctxt; | |
1317 | ||
1318 | cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu); | |
1319 | err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1); | |
1320 | ||
1321 | if (err) { | |
1322 | kvm_err("Cannot map host CPU state: %d\n", err); | |
1323 | goto out_err; | |
1324 | } | |
1325 | } | |
1326 | ||
1327 | #ifndef CONFIG_HOTPLUG_CPU | |
1328 | free_boot_hyp_pgd(); | |
1329 | #endif | |
1330 | ||
1331 | /* set size of VMID supported by CPU */ | |
1332 | kvm_vmid_bits = kvm_get_vmid_bits(); | |
1333 | kvm_info("%d-bit VMID\n", kvm_vmid_bits); | |
1334 | ||
1335 | kvm_info("Hyp mode initialized successfully\n"); | |
1336 | ||
1337 | return 0; | |
1338 | ||
1339 | out_err: | |
1340 | teardown_hyp_mode(); | |
1341 | kvm_err("error initializing Hyp mode: %d\n", err); | |
1342 | return err; | |
1343 | } | |
1344 | ||
1345 | static void check_kvm_target_cpu(void *ret) | |
1346 | { | |
1347 | *(int *)ret = kvm_target_cpu(); | |
1348 | } | |
1349 | ||
1350 | struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr) | |
1351 | { | |
1352 | struct kvm_vcpu *vcpu; | |
1353 | int i; | |
1354 | ||
1355 | mpidr &= MPIDR_HWID_BITMASK; | |
1356 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1357 | if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu)) | |
1358 | return vcpu; | |
1359 | } | |
1360 | return NULL; | |
1361 | } | |
1362 | ||
1363 | /** | |
1364 | * Initialize Hyp-mode and memory mappings on all CPUs. | |
1365 | */ | |
1366 | int kvm_arch_init(void *opaque) | |
1367 | { | |
1368 | int err; | |
1369 | int ret, cpu; | |
1370 | ||
1371 | if (!is_hyp_mode_available()) { | |
1372 | kvm_err("HYP mode not available\n"); | |
1373 | return -ENODEV; | |
1374 | } | |
1375 | ||
1376 | for_each_online_cpu(cpu) { | |
1377 | smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1); | |
1378 | if (ret < 0) { | |
1379 | kvm_err("Error, CPU %d not supported!\n", cpu); | |
1380 | return -ENODEV; | |
1381 | } | |
1382 | } | |
1383 | ||
1384 | err = init_common_resources(); | |
1385 | if (err) | |
1386 | return err; | |
1387 | ||
1388 | if (is_kernel_in_hyp_mode()) | |
1389 | err = init_vhe_mode(); | |
1390 | else | |
1391 | err = init_hyp_mode(); | |
1392 | if (err) | |
1393 | goto out_err; | |
1394 | ||
1395 | err = init_subsystems(); | |
1396 | if (err) | |
1397 | goto out_hyp; | |
1398 | ||
1399 | return 0; | |
1400 | ||
1401 | out_hyp: | |
1402 | teardown_hyp_mode(); | |
1403 | out_err: | |
1404 | teardown_common_resources(); | |
1405 | return err; | |
1406 | } | |
1407 | ||
1408 | /* NOP: Compiling as a module not supported */ | |
1409 | void kvm_arch_exit(void) | |
1410 | { | |
1411 | kvm_perf_teardown(); | |
1412 | } | |
1413 | ||
1414 | static int arm_init(void) | |
1415 | { | |
1416 | int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); | |
1417 | return rc; | |
1418 | } | |
1419 | ||
1420 | module_init(arm_init); |