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749cf76c CD |
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/errno.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/kvm_host.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/vmalloc.h> | |
24 | #include <linux/fs.h> | |
25 | #include <linux/mman.h> | |
26 | #include <linux/sched.h> | |
86ce8535 | 27 | #include <linux/kvm.h> |
749cf76c CD |
28 | #include <trace/events/kvm.h> |
29 | ||
30 | #define CREATE_TRACE_POINTS | |
31 | #include "trace.h" | |
32 | ||
749cf76c CD |
33 | #include <asm/uaccess.h> |
34 | #include <asm/ptrace.h> | |
35 | #include <asm/mman.h> | |
342cd0ab | 36 | #include <asm/tlbflush.h> |
5b3e5e5b | 37 | #include <asm/cacheflush.h> |
342cd0ab CD |
38 | #include <asm/virt.h> |
39 | #include <asm/kvm_arm.h> | |
40 | #include <asm/kvm_asm.h> | |
41 | #include <asm/kvm_mmu.h> | |
f7ed45be | 42 | #include <asm/kvm_emulate.h> |
5b3e5e5b | 43 | #include <asm/kvm_coproc.h> |
aa024c2f | 44 | #include <asm/kvm_psci.h> |
749cf76c CD |
45 | |
46 | #ifdef REQUIRES_VIRT | |
47 | __asm__(".arch_extension virt"); | |
48 | #endif | |
49 | ||
342cd0ab | 50 | static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); |
9c7a6432 | 51 | static kvm_kernel_vfp_t __percpu *kvm_host_vfp_state; |
342cd0ab CD |
52 | static unsigned long hyp_default_vectors; |
53 | ||
1638a12d MZ |
54 | /* Per-CPU variable containing the currently running vcpu. */ |
55 | static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu); | |
56 | ||
f7ed45be CD |
57 | /* The VMID used in the VTTBR */ |
58 | static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); | |
59 | static u8 kvm_next_vmid; | |
60 | static DEFINE_SPINLOCK(kvm_vmid_lock); | |
342cd0ab | 61 | |
1a89dd91 MZ |
62 | static bool vgic_present; |
63 | ||
1638a12d MZ |
64 | static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu) |
65 | { | |
66 | BUG_ON(preemptible()); | |
67 | __get_cpu_var(kvm_arm_running_vcpu) = vcpu; | |
68 | } | |
69 | ||
70 | /** | |
71 | * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU. | |
72 | * Must be called from non-preemptible context | |
73 | */ | |
74 | struct kvm_vcpu *kvm_arm_get_running_vcpu(void) | |
75 | { | |
76 | BUG_ON(preemptible()); | |
77 | return __get_cpu_var(kvm_arm_running_vcpu); | |
78 | } | |
79 | ||
80 | /** | |
81 | * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus. | |
82 | */ | |
83 | struct kvm_vcpu __percpu **kvm_get_running_vcpus(void) | |
84 | { | |
85 | return &kvm_arm_running_vcpu; | |
86 | } | |
87 | ||
749cf76c CD |
88 | int kvm_arch_hardware_enable(void *garbage) |
89 | { | |
90 | return 0; | |
91 | } | |
92 | ||
93 | int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) | |
94 | { | |
95 | return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; | |
96 | } | |
97 | ||
98 | void kvm_arch_hardware_disable(void *garbage) | |
99 | { | |
100 | } | |
101 | ||
102 | int kvm_arch_hardware_setup(void) | |
103 | { | |
104 | return 0; | |
105 | } | |
106 | ||
107 | void kvm_arch_hardware_unsetup(void) | |
108 | { | |
109 | } | |
110 | ||
111 | void kvm_arch_check_processor_compat(void *rtn) | |
112 | { | |
113 | *(int *)rtn = 0; | |
114 | } | |
115 | ||
116 | void kvm_arch_sync_events(struct kvm *kvm) | |
117 | { | |
118 | } | |
119 | ||
d5d8184d CD |
120 | /** |
121 | * kvm_arch_init_vm - initializes a VM data structure | |
122 | * @kvm: pointer to the KVM struct | |
123 | */ | |
749cf76c CD |
124 | int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) |
125 | { | |
d5d8184d CD |
126 | int ret = 0; |
127 | ||
749cf76c CD |
128 | if (type) |
129 | return -EINVAL; | |
130 | ||
d5d8184d CD |
131 | ret = kvm_alloc_stage2_pgd(kvm); |
132 | if (ret) | |
133 | goto out_fail_alloc; | |
134 | ||
135 | ret = create_hyp_mappings(kvm, kvm + 1); | |
136 | if (ret) | |
137 | goto out_free_stage2_pgd; | |
138 | ||
139 | /* Mark the initial VMID generation invalid */ | |
140 | kvm->arch.vmid_gen = 0; | |
141 | ||
142 | return ret; | |
143 | out_free_stage2_pgd: | |
144 | kvm_free_stage2_pgd(kvm); | |
145 | out_fail_alloc: | |
146 | return ret; | |
749cf76c CD |
147 | } |
148 | ||
149 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
150 | { | |
151 | return VM_FAULT_SIGBUS; | |
152 | } | |
153 | ||
154 | void kvm_arch_free_memslot(struct kvm_memory_slot *free, | |
155 | struct kvm_memory_slot *dont) | |
156 | { | |
157 | } | |
158 | ||
159 | int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) | |
160 | { | |
161 | return 0; | |
162 | } | |
163 | ||
d5d8184d CD |
164 | /** |
165 | * kvm_arch_destroy_vm - destroy the VM data structure | |
166 | * @kvm: pointer to the KVM struct | |
167 | */ | |
749cf76c CD |
168 | void kvm_arch_destroy_vm(struct kvm *kvm) |
169 | { | |
170 | int i; | |
171 | ||
d5d8184d CD |
172 | kvm_free_stage2_pgd(kvm); |
173 | ||
749cf76c CD |
174 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
175 | if (kvm->vcpus[i]) { | |
176 | kvm_arch_vcpu_free(kvm->vcpus[i]); | |
177 | kvm->vcpus[i] = NULL; | |
178 | } | |
179 | } | |
180 | } | |
181 | ||
182 | int kvm_dev_ioctl_check_extension(long ext) | |
183 | { | |
184 | int r; | |
185 | switch (ext) { | |
1a89dd91 MZ |
186 | case KVM_CAP_IRQCHIP: |
187 | r = vgic_present; | |
188 | break; | |
749cf76c CD |
189 | case KVM_CAP_USER_MEMORY: |
190 | case KVM_CAP_SYNC_MMU: | |
191 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
192 | case KVM_CAP_ONE_REG: | |
aa024c2f | 193 | case KVM_CAP_ARM_PSCI: |
749cf76c CD |
194 | r = 1; |
195 | break; | |
196 | case KVM_CAP_COALESCED_MMIO: | |
197 | r = KVM_COALESCED_MMIO_PAGE_OFFSET; | |
198 | break; | |
3401d546 CD |
199 | case KVM_CAP_ARM_SET_DEVICE_ADDR: |
200 | r = 1; | |
749cf76c CD |
201 | case KVM_CAP_NR_VCPUS: |
202 | r = num_online_cpus(); | |
203 | break; | |
204 | case KVM_CAP_MAX_VCPUS: | |
205 | r = KVM_MAX_VCPUS; | |
206 | break; | |
207 | default: | |
208 | r = 0; | |
209 | break; | |
210 | } | |
211 | return r; | |
212 | } | |
213 | ||
214 | long kvm_arch_dev_ioctl(struct file *filp, | |
215 | unsigned int ioctl, unsigned long arg) | |
216 | { | |
217 | return -EINVAL; | |
218 | } | |
219 | ||
749cf76c CD |
220 | int kvm_arch_prepare_memory_region(struct kvm *kvm, |
221 | struct kvm_memory_slot *memslot, | |
7b6195a9 TY |
222 | struct kvm_userspace_memory_region *mem, |
223 | enum kvm_mr_change change) | |
749cf76c CD |
224 | { |
225 | return 0; | |
226 | } | |
227 | ||
228 | void kvm_arch_commit_memory_region(struct kvm *kvm, | |
229 | struct kvm_userspace_memory_region *mem, | |
8482644a TY |
230 | const struct kvm_memory_slot *old, |
231 | enum kvm_mr_change change) | |
749cf76c CD |
232 | { |
233 | } | |
234 | ||
235 | void kvm_arch_flush_shadow_all(struct kvm *kvm) | |
236 | { | |
237 | } | |
238 | ||
239 | void kvm_arch_flush_shadow_memslot(struct kvm *kvm, | |
240 | struct kvm_memory_slot *slot) | |
241 | { | |
242 | } | |
243 | ||
244 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) | |
245 | { | |
246 | int err; | |
247 | struct kvm_vcpu *vcpu; | |
248 | ||
249 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
250 | if (!vcpu) { | |
251 | err = -ENOMEM; | |
252 | goto out; | |
253 | } | |
254 | ||
255 | err = kvm_vcpu_init(vcpu, kvm, id); | |
256 | if (err) | |
257 | goto free_vcpu; | |
258 | ||
d5d8184d CD |
259 | err = create_hyp_mappings(vcpu, vcpu + 1); |
260 | if (err) | |
261 | goto vcpu_uninit; | |
262 | ||
749cf76c | 263 | return vcpu; |
d5d8184d CD |
264 | vcpu_uninit: |
265 | kvm_vcpu_uninit(vcpu); | |
749cf76c CD |
266 | free_vcpu: |
267 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
268 | out: | |
269 | return ERR_PTR(err); | |
270 | } | |
271 | ||
272 | int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) | |
273 | { | |
274 | return 0; | |
275 | } | |
276 | ||
277 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
278 | { | |
d5d8184d | 279 | kvm_mmu_free_memory_caches(vcpu); |
967f8427 | 280 | kvm_timer_vcpu_terminate(vcpu); |
d5d8184d | 281 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
749cf76c CD |
282 | } |
283 | ||
284 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
285 | { | |
286 | kvm_arch_vcpu_free(vcpu); | |
287 | } | |
288 | ||
289 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
290 | { | |
291 | return 0; | |
292 | } | |
293 | ||
749cf76c CD |
294 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) |
295 | { | |
1a89dd91 MZ |
296 | int ret; |
297 | ||
f7ed45be CD |
298 | /* Force users to call KVM_ARM_VCPU_INIT */ |
299 | vcpu->arch.target = -1; | |
1a89dd91 MZ |
300 | |
301 | /* Set up VGIC */ | |
302 | ret = kvm_vgic_vcpu_init(vcpu); | |
303 | if (ret) | |
304 | return ret; | |
305 | ||
967f8427 MZ |
306 | /* Set up the timer */ |
307 | kvm_timer_vcpu_init(vcpu); | |
308 | ||
749cf76c CD |
309 | return 0; |
310 | } | |
311 | ||
312 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) | |
313 | { | |
314 | } | |
315 | ||
316 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
317 | { | |
86ce8535 | 318 | vcpu->cpu = cpu; |
f7ed45be | 319 | vcpu->arch.vfp_host = this_cpu_ptr(kvm_host_vfp_state); |
5b3e5e5b CD |
320 | |
321 | /* | |
322 | * Check whether this vcpu requires the cache to be flushed on | |
323 | * this physical CPU. This is a consequence of doing dcache | |
324 | * operations by set/way on this vcpu. We do it here to be in | |
325 | * a non-preemptible section. | |
326 | */ | |
327 | if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush)) | |
328 | flush_cache_all(); /* We'd really want v7_flush_dcache_all() */ | |
1638a12d MZ |
329 | |
330 | kvm_arm_set_running_vcpu(vcpu); | |
749cf76c CD |
331 | } |
332 | ||
333 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
334 | { | |
1638a12d | 335 | kvm_arm_set_running_vcpu(NULL); |
749cf76c CD |
336 | } |
337 | ||
338 | int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, | |
339 | struct kvm_guest_debug *dbg) | |
340 | { | |
341 | return -EINVAL; | |
342 | } | |
343 | ||
344 | ||
345 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, | |
346 | struct kvm_mp_state *mp_state) | |
347 | { | |
348 | return -EINVAL; | |
349 | } | |
350 | ||
351 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
352 | struct kvm_mp_state *mp_state) | |
353 | { | |
354 | return -EINVAL; | |
355 | } | |
356 | ||
5b3e5e5b CD |
357 | /** |
358 | * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled | |
359 | * @v: The VCPU pointer | |
360 | * | |
361 | * If the guest CPU is not waiting for interrupts or an interrupt line is | |
362 | * asserted, the CPU is by definition runnable. | |
363 | */ | |
749cf76c CD |
364 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) |
365 | { | |
1a89dd91 | 366 | return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v); |
749cf76c CD |
367 | } |
368 | ||
f7ed45be CD |
369 | /* Just ensure a guest exit from a particular CPU */ |
370 | static void exit_vm_noop(void *info) | |
371 | { | |
372 | } | |
373 | ||
374 | void force_vm_exit(const cpumask_t *mask) | |
375 | { | |
376 | smp_call_function_many(mask, exit_vm_noop, NULL, true); | |
377 | } | |
378 | ||
379 | /** | |
380 | * need_new_vmid_gen - check that the VMID is still valid | |
381 | * @kvm: The VM's VMID to checkt | |
382 | * | |
383 | * return true if there is a new generation of VMIDs being used | |
384 | * | |
385 | * The hardware supports only 256 values with the value zero reserved for the | |
386 | * host, so we check if an assigned value belongs to a previous generation, | |
387 | * which which requires us to assign a new value. If we're the first to use a | |
388 | * VMID for the new generation, we must flush necessary caches and TLBs on all | |
389 | * CPUs. | |
390 | */ | |
391 | static bool need_new_vmid_gen(struct kvm *kvm) | |
392 | { | |
393 | return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); | |
394 | } | |
395 | ||
396 | /** | |
397 | * update_vttbr - Update the VTTBR with a valid VMID before the guest runs | |
398 | * @kvm The guest that we are about to run | |
399 | * | |
400 | * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the | |
401 | * VM has a valid VMID, otherwise assigns a new one and flushes corresponding | |
402 | * caches and TLBs. | |
403 | */ | |
404 | static void update_vttbr(struct kvm *kvm) | |
405 | { | |
406 | phys_addr_t pgd_phys; | |
407 | u64 vmid; | |
408 | ||
409 | if (!need_new_vmid_gen(kvm)) | |
410 | return; | |
411 | ||
412 | spin_lock(&kvm_vmid_lock); | |
413 | ||
414 | /* | |
415 | * We need to re-check the vmid_gen here to ensure that if another vcpu | |
416 | * already allocated a valid vmid for this vm, then this vcpu should | |
417 | * use the same vmid. | |
418 | */ | |
419 | if (!need_new_vmid_gen(kvm)) { | |
420 | spin_unlock(&kvm_vmid_lock); | |
421 | return; | |
422 | } | |
423 | ||
424 | /* First user of a new VMID generation? */ | |
425 | if (unlikely(kvm_next_vmid == 0)) { | |
426 | atomic64_inc(&kvm_vmid_gen); | |
427 | kvm_next_vmid = 1; | |
428 | ||
429 | /* | |
430 | * On SMP we know no other CPUs can use this CPU's or each | |
431 | * other's VMID after force_vm_exit returns since the | |
432 | * kvm_vmid_lock blocks them from reentry to the guest. | |
433 | */ | |
434 | force_vm_exit(cpu_all_mask); | |
435 | /* | |
436 | * Now broadcast TLB + ICACHE invalidation over the inner | |
437 | * shareable domain to make sure all data structures are | |
438 | * clean. | |
439 | */ | |
440 | kvm_call_hyp(__kvm_flush_vm_context); | |
441 | } | |
442 | ||
443 | kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); | |
444 | kvm->arch.vmid = kvm_next_vmid; | |
445 | kvm_next_vmid++; | |
446 | ||
447 | /* update vttbr to be used with the new vmid */ | |
448 | pgd_phys = virt_to_phys(kvm->arch.pgd); | |
449 | vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK; | |
450 | kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK; | |
451 | kvm->arch.vttbr |= vmid; | |
452 | ||
453 | spin_unlock(&kvm_vmid_lock); | |
454 | } | |
455 | ||
f7ed45be CD |
456 | static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) |
457 | { | |
458 | if (likely(vcpu->arch.has_run_once)) | |
459 | return 0; | |
460 | ||
461 | vcpu->arch.has_run_once = true; | |
aa024c2f | 462 | |
01ac5e34 MZ |
463 | /* |
464 | * Initialize the VGIC before running a vcpu the first time on | |
465 | * this VM. | |
466 | */ | |
467 | if (irqchip_in_kernel(vcpu->kvm) && | |
468 | unlikely(!vgic_initialized(vcpu->kvm))) { | |
469 | int ret = kvm_vgic_init(vcpu->kvm); | |
470 | if (ret) | |
471 | return ret; | |
472 | } | |
473 | ||
aa024c2f MZ |
474 | /* |
475 | * Handle the "start in power-off" case by calling into the | |
476 | * PSCI code. | |
477 | */ | |
478 | if (test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) { | |
479 | *vcpu_reg(vcpu, 0) = KVM_PSCI_FN_CPU_OFF; | |
480 | kvm_psci_call(vcpu); | |
481 | } | |
482 | ||
f7ed45be CD |
483 | return 0; |
484 | } | |
485 | ||
aa024c2f MZ |
486 | static void vcpu_pause(struct kvm_vcpu *vcpu) |
487 | { | |
488 | wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); | |
489 | ||
490 | wait_event_interruptible(*wq, !vcpu->arch.pause); | |
491 | } | |
492 | ||
f7ed45be CD |
493 | /** |
494 | * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code | |
495 | * @vcpu: The VCPU pointer | |
496 | * @run: The kvm_run structure pointer used for userspace state exchange | |
497 | * | |
498 | * This function is called through the VCPU_RUN ioctl called from user space. It | |
499 | * will execute VM code in a loop until the time slice for the process is used | |
500 | * or some emulation is needed from user space in which case the function will | |
501 | * return with return value 0 and with the kvm_run structure filled in with the | |
502 | * required data for the requested emulation. | |
503 | */ | |
749cf76c CD |
504 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) |
505 | { | |
f7ed45be CD |
506 | int ret; |
507 | sigset_t sigsaved; | |
508 | ||
509 | /* Make sure they initialize the vcpu with KVM_ARM_VCPU_INIT */ | |
510 | if (unlikely(vcpu->arch.target < 0)) | |
511 | return -ENOEXEC; | |
512 | ||
513 | ret = kvm_vcpu_first_run_init(vcpu); | |
514 | if (ret) | |
515 | return ret; | |
516 | ||
45e96ea6 CD |
517 | if (run->exit_reason == KVM_EXIT_MMIO) { |
518 | ret = kvm_handle_mmio_return(vcpu, vcpu->run); | |
519 | if (ret) | |
520 | return ret; | |
521 | } | |
522 | ||
f7ed45be CD |
523 | if (vcpu->sigset_active) |
524 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
525 | ||
526 | ret = 1; | |
527 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
528 | while (ret > 0) { | |
529 | /* | |
530 | * Check conditions before entering the guest | |
531 | */ | |
532 | cond_resched(); | |
533 | ||
534 | update_vttbr(vcpu->kvm); | |
535 | ||
aa024c2f MZ |
536 | if (vcpu->arch.pause) |
537 | vcpu_pause(vcpu); | |
538 | ||
1a89dd91 | 539 | kvm_vgic_flush_hwstate(vcpu); |
c7e3ba64 | 540 | kvm_timer_flush_hwstate(vcpu); |
1a89dd91 | 541 | |
f7ed45be CD |
542 | local_irq_disable(); |
543 | ||
544 | /* | |
545 | * Re-check atomic conditions | |
546 | */ | |
547 | if (signal_pending(current)) { | |
548 | ret = -EINTR; | |
549 | run->exit_reason = KVM_EXIT_INTR; | |
550 | } | |
551 | ||
552 | if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) { | |
553 | local_irq_enable(); | |
c7e3ba64 | 554 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 | 555 | kvm_vgic_sync_hwstate(vcpu); |
f7ed45be CD |
556 | continue; |
557 | } | |
558 | ||
559 | /************************************************************** | |
560 | * Enter the guest | |
561 | */ | |
562 | trace_kvm_entry(*vcpu_pc(vcpu)); | |
563 | kvm_guest_enter(); | |
564 | vcpu->mode = IN_GUEST_MODE; | |
565 | ||
566 | ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); | |
567 | ||
568 | vcpu->mode = OUTSIDE_GUEST_MODE; | |
5b3e5e5b | 569 | vcpu->arch.last_pcpu = smp_processor_id(); |
f7ed45be CD |
570 | kvm_guest_exit(); |
571 | trace_kvm_exit(*vcpu_pc(vcpu)); | |
572 | /* | |
573 | * We may have taken a host interrupt in HYP mode (ie | |
574 | * while executing the guest). This interrupt is still | |
575 | * pending, as we haven't serviced it yet! | |
576 | * | |
577 | * We're now back in SVC mode, with interrupts | |
578 | * disabled. Enabling the interrupts now will have | |
579 | * the effect of taking the interrupt again, in SVC | |
580 | * mode this time. | |
581 | */ | |
582 | local_irq_enable(); | |
583 | ||
584 | /* | |
585 | * Back from guest | |
586 | *************************************************************/ | |
587 | ||
c7e3ba64 | 588 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 MZ |
589 | kvm_vgic_sync_hwstate(vcpu); |
590 | ||
f7ed45be CD |
591 | ret = handle_exit(vcpu, run, ret); |
592 | } | |
593 | ||
594 | if (vcpu->sigset_active) | |
595 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
596 | return ret; | |
749cf76c CD |
597 | } |
598 | ||
86ce8535 CD |
599 | static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) |
600 | { | |
601 | int bit_index; | |
602 | bool set; | |
603 | unsigned long *ptr; | |
604 | ||
605 | if (number == KVM_ARM_IRQ_CPU_IRQ) | |
606 | bit_index = __ffs(HCR_VI); | |
607 | else /* KVM_ARM_IRQ_CPU_FIQ */ | |
608 | bit_index = __ffs(HCR_VF); | |
609 | ||
610 | ptr = (unsigned long *)&vcpu->arch.irq_lines; | |
611 | if (level) | |
612 | set = test_and_set_bit(bit_index, ptr); | |
613 | else | |
614 | set = test_and_clear_bit(bit_index, ptr); | |
615 | ||
616 | /* | |
617 | * If we didn't change anything, no need to wake up or kick other CPUs | |
618 | */ | |
619 | if (set == level) | |
620 | return 0; | |
621 | ||
622 | /* | |
623 | * The vcpu irq_lines field was updated, wake up sleeping VCPUs and | |
624 | * trigger a world-switch round on the running physical CPU to set the | |
625 | * virtual IRQ/FIQ fields in the HCR appropriately. | |
626 | */ | |
627 | kvm_vcpu_kick(vcpu); | |
628 | ||
629 | return 0; | |
630 | } | |
631 | ||
79558f11 AG |
632 | int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, |
633 | bool line_status) | |
86ce8535 CD |
634 | { |
635 | u32 irq = irq_level->irq; | |
636 | unsigned int irq_type, vcpu_idx, irq_num; | |
637 | int nrcpus = atomic_read(&kvm->online_vcpus); | |
638 | struct kvm_vcpu *vcpu = NULL; | |
639 | bool level = irq_level->level; | |
640 | ||
641 | irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; | |
642 | vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; | |
643 | irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; | |
644 | ||
645 | trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); | |
646 | ||
5863c2ce MZ |
647 | switch (irq_type) { |
648 | case KVM_ARM_IRQ_TYPE_CPU: | |
649 | if (irqchip_in_kernel(kvm)) | |
650 | return -ENXIO; | |
86ce8535 | 651 | |
5863c2ce MZ |
652 | if (vcpu_idx >= nrcpus) |
653 | return -EINVAL; | |
86ce8535 | 654 | |
5863c2ce MZ |
655 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); |
656 | if (!vcpu) | |
657 | return -EINVAL; | |
86ce8535 | 658 | |
5863c2ce MZ |
659 | if (irq_num > KVM_ARM_IRQ_CPU_FIQ) |
660 | return -EINVAL; | |
661 | ||
662 | return vcpu_interrupt_line(vcpu, irq_num, level); | |
663 | case KVM_ARM_IRQ_TYPE_PPI: | |
664 | if (!irqchip_in_kernel(kvm)) | |
665 | return -ENXIO; | |
666 | ||
667 | if (vcpu_idx >= nrcpus) | |
668 | return -EINVAL; | |
669 | ||
670 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); | |
671 | if (!vcpu) | |
672 | return -EINVAL; | |
673 | ||
674 | if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) | |
675 | return -EINVAL; | |
86ce8535 | 676 | |
5863c2ce MZ |
677 | return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); |
678 | case KVM_ARM_IRQ_TYPE_SPI: | |
679 | if (!irqchip_in_kernel(kvm)) | |
680 | return -ENXIO; | |
681 | ||
682 | if (irq_num < VGIC_NR_PRIVATE_IRQS || | |
683 | irq_num > KVM_ARM_IRQ_GIC_MAX) | |
684 | return -EINVAL; | |
685 | ||
686 | return kvm_vgic_inject_irq(kvm, 0, irq_num, level); | |
687 | } | |
688 | ||
689 | return -EINVAL; | |
86ce8535 CD |
690 | } |
691 | ||
749cf76c CD |
692 | long kvm_arch_vcpu_ioctl(struct file *filp, |
693 | unsigned int ioctl, unsigned long arg) | |
694 | { | |
695 | struct kvm_vcpu *vcpu = filp->private_data; | |
696 | void __user *argp = (void __user *)arg; | |
697 | ||
698 | switch (ioctl) { | |
699 | case KVM_ARM_VCPU_INIT: { | |
700 | struct kvm_vcpu_init init; | |
701 | ||
702 | if (copy_from_user(&init, argp, sizeof(init))) | |
703 | return -EFAULT; | |
704 | ||
705 | return kvm_vcpu_set_target(vcpu, &init); | |
706 | ||
707 | } | |
708 | case KVM_SET_ONE_REG: | |
709 | case KVM_GET_ONE_REG: { | |
710 | struct kvm_one_reg reg; | |
711 | if (copy_from_user(®, argp, sizeof(reg))) | |
712 | return -EFAULT; | |
713 | if (ioctl == KVM_SET_ONE_REG) | |
714 | return kvm_arm_set_reg(vcpu, ®); | |
715 | else | |
716 | return kvm_arm_get_reg(vcpu, ®); | |
717 | } | |
718 | case KVM_GET_REG_LIST: { | |
719 | struct kvm_reg_list __user *user_list = argp; | |
720 | struct kvm_reg_list reg_list; | |
721 | unsigned n; | |
722 | ||
723 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) | |
724 | return -EFAULT; | |
725 | n = reg_list.n; | |
726 | reg_list.n = kvm_arm_num_regs(vcpu); | |
727 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) | |
728 | return -EFAULT; | |
729 | if (n < reg_list.n) | |
730 | return -E2BIG; | |
731 | return kvm_arm_copy_reg_indices(vcpu, user_list->reg); | |
732 | } | |
733 | default: | |
734 | return -EINVAL; | |
735 | } | |
736 | } | |
737 | ||
738 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) | |
739 | { | |
740 | return -EINVAL; | |
741 | } | |
742 | ||
3401d546 CD |
743 | static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, |
744 | struct kvm_arm_device_addr *dev_addr) | |
745 | { | |
330690cd CD |
746 | unsigned long dev_id, type; |
747 | ||
748 | dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> | |
749 | KVM_ARM_DEVICE_ID_SHIFT; | |
750 | type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> | |
751 | KVM_ARM_DEVICE_TYPE_SHIFT; | |
752 | ||
753 | switch (dev_id) { | |
754 | case KVM_ARM_DEVICE_VGIC_V2: | |
755 | if (!vgic_present) | |
756 | return -ENXIO; | |
757 | return kvm_vgic_set_addr(kvm, type, dev_addr->addr); | |
758 | default: | |
759 | return -ENODEV; | |
760 | } | |
3401d546 CD |
761 | } |
762 | ||
749cf76c CD |
763 | long kvm_arch_vm_ioctl(struct file *filp, |
764 | unsigned int ioctl, unsigned long arg) | |
765 | { | |
3401d546 CD |
766 | struct kvm *kvm = filp->private_data; |
767 | void __user *argp = (void __user *)arg; | |
768 | ||
769 | switch (ioctl) { | |
5863c2ce MZ |
770 | case KVM_CREATE_IRQCHIP: { |
771 | if (vgic_present) | |
772 | return kvm_vgic_create(kvm); | |
773 | else | |
774 | return -ENXIO; | |
775 | } | |
3401d546 CD |
776 | case KVM_ARM_SET_DEVICE_ADDR: { |
777 | struct kvm_arm_device_addr dev_addr; | |
778 | ||
779 | if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) | |
780 | return -EFAULT; | |
781 | return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); | |
782 | } | |
783 | default: | |
784 | return -EINVAL; | |
785 | } | |
749cf76c CD |
786 | } |
787 | ||
342cd0ab CD |
788 | static void cpu_init_hyp_mode(void *vector) |
789 | { | |
790 | unsigned long long pgd_ptr; | |
342cd0ab CD |
791 | unsigned long hyp_stack_ptr; |
792 | unsigned long stack_page; | |
793 | unsigned long vector_ptr; | |
794 | ||
795 | /* Switch from the HYP stub to our own HYP init vector */ | |
796 | __hyp_set_vectors((unsigned long)vector); | |
797 | ||
798 | pgd_ptr = (unsigned long long)kvm_mmu_get_httbr(); | |
342cd0ab CD |
799 | stack_page = __get_cpu_var(kvm_arm_hyp_stack_page); |
800 | hyp_stack_ptr = stack_page + PAGE_SIZE; | |
801 | vector_ptr = (unsigned long)__kvm_hyp_vector; | |
802 | ||
e7858c58 | 803 | __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr); |
342cd0ab CD |
804 | } |
805 | ||
806 | /** | |
807 | * Inits Hyp-mode on all online CPUs | |
808 | */ | |
809 | static int init_hyp_mode(void) | |
810 | { | |
811 | phys_addr_t init_phys_addr; | |
812 | int cpu; | |
813 | int err = 0; | |
814 | ||
815 | /* | |
816 | * Allocate Hyp PGD and setup Hyp identity mapping | |
817 | */ | |
818 | err = kvm_mmu_init(); | |
819 | if (err) | |
820 | goto out_err; | |
821 | ||
822 | /* | |
823 | * It is probably enough to obtain the default on one | |
824 | * CPU. It's unlikely to be different on the others. | |
825 | */ | |
826 | hyp_default_vectors = __hyp_get_vectors(); | |
827 | ||
828 | /* | |
829 | * Allocate stack pages for Hypervisor-mode | |
830 | */ | |
831 | for_each_possible_cpu(cpu) { | |
832 | unsigned long stack_page; | |
833 | ||
834 | stack_page = __get_free_page(GFP_KERNEL); | |
835 | if (!stack_page) { | |
836 | err = -ENOMEM; | |
837 | goto out_free_stack_pages; | |
838 | } | |
839 | ||
840 | per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; | |
841 | } | |
842 | ||
843 | /* | |
844 | * Execute the init code on each CPU. | |
845 | * | |
846 | * Note: The stack is not mapped yet, so don't do anything else than | |
847 | * initializing the hypervisor mode on each CPU using a local stack | |
848 | * space for temporary storage. | |
849 | */ | |
850 | init_phys_addr = virt_to_phys(__kvm_hyp_init); | |
851 | for_each_online_cpu(cpu) { | |
852 | smp_call_function_single(cpu, cpu_init_hyp_mode, | |
853 | (void *)(long)init_phys_addr, 1); | |
854 | } | |
855 | ||
856 | /* | |
857 | * Unmap the identity mapping | |
858 | */ | |
859 | kvm_clear_hyp_idmap(); | |
860 | ||
861 | /* | |
862 | * Map the Hyp-code called directly from the host | |
863 | */ | |
864 | err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end); | |
865 | if (err) { | |
866 | kvm_err("Cannot map world-switch code\n"); | |
867 | goto out_free_mappings; | |
868 | } | |
869 | ||
870 | /* | |
871 | * Map the Hyp stack pages | |
872 | */ | |
873 | for_each_possible_cpu(cpu) { | |
874 | char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); | |
875 | err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE); | |
876 | ||
877 | if (err) { | |
878 | kvm_err("Cannot map hyp stack\n"); | |
879 | goto out_free_mappings; | |
880 | } | |
881 | } | |
882 | ||
883 | /* | |
884 | * Map the host VFP structures | |
885 | */ | |
9c7a6432 | 886 | kvm_host_vfp_state = alloc_percpu(kvm_kernel_vfp_t); |
342cd0ab CD |
887 | if (!kvm_host_vfp_state) { |
888 | err = -ENOMEM; | |
889 | kvm_err("Cannot allocate host VFP state\n"); | |
890 | goto out_free_mappings; | |
891 | } | |
892 | ||
893 | for_each_possible_cpu(cpu) { | |
9c7a6432 | 894 | kvm_kernel_vfp_t *vfp; |
342cd0ab CD |
895 | |
896 | vfp = per_cpu_ptr(kvm_host_vfp_state, cpu); | |
897 | err = create_hyp_mappings(vfp, vfp + 1); | |
898 | ||
899 | if (err) { | |
900 | kvm_err("Cannot map host VFP state: %d\n", err); | |
901 | goto out_free_vfp; | |
902 | } | |
903 | } | |
904 | ||
1a89dd91 MZ |
905 | /* |
906 | * Init HYP view of VGIC | |
907 | */ | |
908 | err = kvm_vgic_hyp_init(); | |
909 | if (err) | |
910 | goto out_free_vfp; | |
911 | ||
01ac5e34 MZ |
912 | #ifdef CONFIG_KVM_ARM_VGIC |
913 | vgic_present = true; | |
914 | #endif | |
915 | ||
967f8427 MZ |
916 | /* |
917 | * Init HYP architected timer support | |
918 | */ | |
919 | err = kvm_timer_hyp_init(); | |
920 | if (err) | |
921 | goto out_free_mappings; | |
922 | ||
210552c1 MZ |
923 | kvm_perf_init(); |
924 | ||
342cd0ab | 925 | kvm_info("Hyp mode initialized successfully\n"); |
210552c1 | 926 | |
342cd0ab CD |
927 | return 0; |
928 | out_free_vfp: | |
929 | free_percpu(kvm_host_vfp_state); | |
930 | out_free_mappings: | |
4f728276 | 931 | free_hyp_pgds(); |
342cd0ab CD |
932 | out_free_stack_pages: |
933 | for_each_possible_cpu(cpu) | |
934 | free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); | |
935 | out_err: | |
936 | kvm_err("error initializing Hyp mode: %d\n", err); | |
937 | return err; | |
938 | } | |
939 | ||
940 | /** | |
941 | * Initialize Hyp-mode and memory mappings on all CPUs. | |
942 | */ | |
749cf76c CD |
943 | int kvm_arch_init(void *opaque) |
944 | { | |
342cd0ab CD |
945 | int err; |
946 | ||
947 | if (!is_hyp_mode_available()) { | |
948 | kvm_err("HYP mode not available\n"); | |
949 | return -ENODEV; | |
950 | } | |
951 | ||
952 | if (kvm_target_cpu() < 0) { | |
953 | kvm_err("Target CPU not supported!\n"); | |
954 | return -ENODEV; | |
955 | } | |
956 | ||
957 | err = init_hyp_mode(); | |
958 | if (err) | |
959 | goto out_err; | |
960 | ||
5b3e5e5b | 961 | kvm_coproc_table_init(); |
749cf76c | 962 | return 0; |
342cd0ab CD |
963 | out_err: |
964 | return err; | |
749cf76c CD |
965 | } |
966 | ||
967 | /* NOP: Compiling as a module not supported */ | |
968 | void kvm_arch_exit(void) | |
969 | { | |
210552c1 | 970 | kvm_perf_teardown(); |
749cf76c CD |
971 | } |
972 | ||
973 | static int arm_init(void) | |
974 | { | |
975 | int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); | |
976 | return rc; | |
977 | } | |
978 | ||
979 | module_init(arm_init); |