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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 | ||
d157f4a5 | 19 | #include <linux/cpu.h> |
1fcf7ce0 | 20 | #include <linux/cpu_pm.h> |
749cf76c CD |
21 | #include <linux/errno.h> |
22 | #include <linux/err.h> | |
23 | #include <linux/kvm_host.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/vmalloc.h> | |
26 | #include <linux/fs.h> | |
27 | #include <linux/mman.h> | |
28 | #include <linux/sched.h> | |
86ce8535 | 29 | #include <linux/kvm.h> |
749cf76c CD |
30 | #include <trace/events/kvm.h> |
31 | ||
32 | #define CREATE_TRACE_POINTS | |
33 | #include "trace.h" | |
34 | ||
749cf76c CD |
35 | #include <asm/uaccess.h> |
36 | #include <asm/ptrace.h> | |
37 | #include <asm/mman.h> | |
342cd0ab | 38 | #include <asm/tlbflush.h> |
5b3e5e5b | 39 | #include <asm/cacheflush.h> |
342cd0ab CD |
40 | #include <asm/virt.h> |
41 | #include <asm/kvm_arm.h> | |
42 | #include <asm/kvm_asm.h> | |
43 | #include <asm/kvm_mmu.h> | |
f7ed45be | 44 | #include <asm/kvm_emulate.h> |
5b3e5e5b | 45 | #include <asm/kvm_coproc.h> |
aa024c2f | 46 | #include <asm/kvm_psci.h> |
749cf76c CD |
47 | |
48 | #ifdef REQUIRES_VIRT | |
49 | __asm__(".arch_extension virt"); | |
50 | #endif | |
51 | ||
342cd0ab | 52 | static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); |
3de50da6 | 53 | static kvm_cpu_context_t __percpu *kvm_host_cpu_state; |
342cd0ab CD |
54 | static unsigned long hyp_default_vectors; |
55 | ||
1638a12d MZ |
56 | /* Per-CPU variable containing the currently running vcpu. */ |
57 | static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu); | |
58 | ||
f7ed45be CD |
59 | /* The VMID used in the VTTBR */ |
60 | static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); | |
61 | static u8 kvm_next_vmid; | |
62 | static DEFINE_SPINLOCK(kvm_vmid_lock); | |
342cd0ab | 63 | |
1a89dd91 MZ |
64 | static bool vgic_present; |
65 | ||
1638a12d MZ |
66 | static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu) |
67 | { | |
68 | BUG_ON(preemptible()); | |
1436c1aa | 69 | __this_cpu_write(kvm_arm_running_vcpu, vcpu); |
1638a12d MZ |
70 | } |
71 | ||
72 | /** | |
73 | * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU. | |
74 | * Must be called from non-preemptible context | |
75 | */ | |
76 | struct kvm_vcpu *kvm_arm_get_running_vcpu(void) | |
77 | { | |
78 | BUG_ON(preemptible()); | |
1436c1aa | 79 | return __this_cpu_read(kvm_arm_running_vcpu); |
1638a12d MZ |
80 | } |
81 | ||
82 | /** | |
83 | * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus. | |
84 | */ | |
85 | struct kvm_vcpu __percpu **kvm_get_running_vcpus(void) | |
86 | { | |
87 | return &kvm_arm_running_vcpu; | |
88 | } | |
89 | ||
749cf76c CD |
90 | int kvm_arch_hardware_enable(void *garbage) |
91 | { | |
92 | return 0; | |
93 | } | |
94 | ||
95 | int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) | |
96 | { | |
97 | return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; | |
98 | } | |
99 | ||
100 | void kvm_arch_hardware_disable(void *garbage) | |
101 | { | |
102 | } | |
103 | ||
104 | int kvm_arch_hardware_setup(void) | |
105 | { | |
106 | return 0; | |
107 | } | |
108 | ||
109 | void kvm_arch_hardware_unsetup(void) | |
110 | { | |
111 | } | |
112 | ||
113 | void kvm_arch_check_processor_compat(void *rtn) | |
114 | { | |
115 | *(int *)rtn = 0; | |
116 | } | |
117 | ||
118 | void kvm_arch_sync_events(struct kvm *kvm) | |
119 | { | |
120 | } | |
121 | ||
d5d8184d CD |
122 | /** |
123 | * kvm_arch_init_vm - initializes a VM data structure | |
124 | * @kvm: pointer to the KVM struct | |
125 | */ | |
749cf76c CD |
126 | int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) |
127 | { | |
d5d8184d CD |
128 | int ret = 0; |
129 | ||
749cf76c CD |
130 | if (type) |
131 | return -EINVAL; | |
132 | ||
d5d8184d CD |
133 | ret = kvm_alloc_stage2_pgd(kvm); |
134 | if (ret) | |
135 | goto out_fail_alloc; | |
136 | ||
137 | ret = create_hyp_mappings(kvm, kvm + 1); | |
138 | if (ret) | |
139 | goto out_free_stage2_pgd; | |
140 | ||
141 | /* Mark the initial VMID generation invalid */ | |
142 | kvm->arch.vmid_gen = 0; | |
143 | ||
144 | return ret; | |
145 | out_free_stage2_pgd: | |
146 | kvm_free_stage2_pgd(kvm); | |
147 | out_fail_alloc: | |
148 | return ret; | |
749cf76c CD |
149 | } |
150 | ||
151 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
152 | { | |
153 | return VM_FAULT_SIGBUS; | |
154 | } | |
155 | ||
5587027c | 156 | void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, |
749cf76c CD |
157 | struct kvm_memory_slot *dont) |
158 | { | |
159 | } | |
160 | ||
5587027c AK |
161 | int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, |
162 | unsigned long npages) | |
749cf76c CD |
163 | { |
164 | return 0; | |
165 | } | |
166 | ||
d5d8184d CD |
167 | /** |
168 | * kvm_arch_destroy_vm - destroy the VM data structure | |
169 | * @kvm: pointer to the KVM struct | |
170 | */ | |
749cf76c CD |
171 | void kvm_arch_destroy_vm(struct kvm *kvm) |
172 | { | |
173 | int i; | |
174 | ||
d5d8184d CD |
175 | kvm_free_stage2_pgd(kvm); |
176 | ||
749cf76c CD |
177 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
178 | if (kvm->vcpus[i]) { | |
179 | kvm_arch_vcpu_free(kvm->vcpus[i]); | |
180 | kvm->vcpus[i] = NULL; | |
181 | } | |
182 | } | |
183 | } | |
184 | ||
185 | int kvm_dev_ioctl_check_extension(long ext) | |
186 | { | |
187 | int r; | |
188 | switch (ext) { | |
1a89dd91 MZ |
189 | case KVM_CAP_IRQCHIP: |
190 | r = vgic_present; | |
191 | break; | |
749cf76c CD |
192 | case KVM_CAP_USER_MEMORY: |
193 | case KVM_CAP_SYNC_MMU: | |
194 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
195 | case KVM_CAP_ONE_REG: | |
aa024c2f | 196 | case KVM_CAP_ARM_PSCI: |
749cf76c CD |
197 | r = 1; |
198 | break; | |
199 | case KVM_CAP_COALESCED_MMIO: | |
200 | r = KVM_COALESCED_MMIO_PAGE_OFFSET; | |
201 | break; | |
3401d546 CD |
202 | case KVM_CAP_ARM_SET_DEVICE_ADDR: |
203 | r = 1; | |
ca46e10f | 204 | break; |
749cf76c CD |
205 | case KVM_CAP_NR_VCPUS: |
206 | r = num_online_cpus(); | |
207 | break; | |
208 | case KVM_CAP_MAX_VCPUS: | |
209 | r = KVM_MAX_VCPUS; | |
210 | break; | |
211 | default: | |
17b1e31f | 212 | r = kvm_arch_dev_ioctl_check_extension(ext); |
749cf76c CD |
213 | break; |
214 | } | |
215 | return r; | |
216 | } | |
217 | ||
218 | long kvm_arch_dev_ioctl(struct file *filp, | |
219 | unsigned int ioctl, unsigned long arg) | |
220 | { | |
221 | return -EINVAL; | |
222 | } | |
223 | ||
e59dbe09 TY |
224 | void kvm_arch_memslots_updated(struct kvm *kvm) |
225 | { | |
226 | } | |
227 | ||
749cf76c CD |
228 | int kvm_arch_prepare_memory_region(struct kvm *kvm, |
229 | struct kvm_memory_slot *memslot, | |
749cf76c | 230 | struct kvm_userspace_memory_region *mem, |
7b6195a9 | 231 | enum kvm_mr_change change) |
749cf76c CD |
232 | { |
233 | return 0; | |
234 | } | |
235 | ||
236 | void kvm_arch_commit_memory_region(struct kvm *kvm, | |
237 | struct kvm_userspace_memory_region *mem, | |
8482644a TY |
238 | const struct kvm_memory_slot *old, |
239 | enum kvm_mr_change change) | |
749cf76c CD |
240 | { |
241 | } | |
242 | ||
243 | void kvm_arch_flush_shadow_all(struct kvm *kvm) | |
244 | { | |
245 | } | |
246 | ||
247 | void kvm_arch_flush_shadow_memslot(struct kvm *kvm, | |
248 | struct kvm_memory_slot *slot) | |
249 | { | |
250 | } | |
251 | ||
252 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) | |
253 | { | |
254 | int err; | |
255 | struct kvm_vcpu *vcpu; | |
256 | ||
257 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
258 | if (!vcpu) { | |
259 | err = -ENOMEM; | |
260 | goto out; | |
261 | } | |
262 | ||
263 | err = kvm_vcpu_init(vcpu, kvm, id); | |
264 | if (err) | |
265 | goto free_vcpu; | |
266 | ||
d5d8184d CD |
267 | err = create_hyp_mappings(vcpu, vcpu + 1); |
268 | if (err) | |
269 | goto vcpu_uninit; | |
270 | ||
749cf76c | 271 | return vcpu; |
d5d8184d CD |
272 | vcpu_uninit: |
273 | kvm_vcpu_uninit(vcpu); | |
749cf76c CD |
274 | free_vcpu: |
275 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
276 | out: | |
277 | return ERR_PTR(err); | |
278 | } | |
279 | ||
280 | int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) | |
281 | { | |
282 | return 0; | |
283 | } | |
284 | ||
285 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
286 | { | |
d5d8184d | 287 | kvm_mmu_free_memory_caches(vcpu); |
967f8427 | 288 | kvm_timer_vcpu_terminate(vcpu); |
d5d8184d | 289 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
749cf76c CD |
290 | } |
291 | ||
292 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
293 | { | |
294 | kvm_arch_vcpu_free(vcpu); | |
295 | } | |
296 | ||
297 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
298 | { | |
299 | return 0; | |
300 | } | |
301 | ||
749cf76c CD |
302 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) |
303 | { | |
1a89dd91 MZ |
304 | int ret; |
305 | ||
f7ed45be CD |
306 | /* Force users to call KVM_ARM_VCPU_INIT */ |
307 | vcpu->arch.target = -1; | |
1a89dd91 MZ |
308 | |
309 | /* Set up VGIC */ | |
310 | ret = kvm_vgic_vcpu_init(vcpu); | |
311 | if (ret) | |
312 | return ret; | |
313 | ||
967f8427 MZ |
314 | /* Set up the timer */ |
315 | kvm_timer_vcpu_init(vcpu); | |
316 | ||
749cf76c CD |
317 | return 0; |
318 | } | |
319 | ||
320 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) | |
321 | { | |
322 | } | |
323 | ||
324 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
325 | { | |
86ce8535 | 326 | vcpu->cpu = cpu; |
3de50da6 | 327 | vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state); |
5b3e5e5b CD |
328 | |
329 | /* | |
330 | * Check whether this vcpu requires the cache to be flushed on | |
331 | * this physical CPU. This is a consequence of doing dcache | |
332 | * operations by set/way on this vcpu. We do it here to be in | |
333 | * a non-preemptible section. | |
334 | */ | |
335 | if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush)) | |
336 | flush_cache_all(); /* We'd really want v7_flush_dcache_all() */ | |
1638a12d MZ |
337 | |
338 | kvm_arm_set_running_vcpu(vcpu); | |
749cf76c CD |
339 | } |
340 | ||
341 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
342 | { | |
1638a12d | 343 | kvm_arm_set_running_vcpu(NULL); |
749cf76c CD |
344 | } |
345 | ||
346 | int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, | |
347 | struct kvm_guest_debug *dbg) | |
348 | { | |
349 | return -EINVAL; | |
350 | } | |
351 | ||
352 | ||
353 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, | |
354 | struct kvm_mp_state *mp_state) | |
355 | { | |
356 | return -EINVAL; | |
357 | } | |
358 | ||
359 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
360 | struct kvm_mp_state *mp_state) | |
361 | { | |
362 | return -EINVAL; | |
363 | } | |
364 | ||
5b3e5e5b CD |
365 | /** |
366 | * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled | |
367 | * @v: The VCPU pointer | |
368 | * | |
369 | * If the guest CPU is not waiting for interrupts or an interrupt line is | |
370 | * asserted, the CPU is by definition runnable. | |
371 | */ | |
749cf76c CD |
372 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) |
373 | { | |
1a89dd91 | 374 | return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v); |
749cf76c CD |
375 | } |
376 | ||
f7ed45be CD |
377 | /* Just ensure a guest exit from a particular CPU */ |
378 | static void exit_vm_noop(void *info) | |
379 | { | |
380 | } | |
381 | ||
382 | void force_vm_exit(const cpumask_t *mask) | |
383 | { | |
384 | smp_call_function_many(mask, exit_vm_noop, NULL, true); | |
385 | } | |
386 | ||
387 | /** | |
388 | * need_new_vmid_gen - check that the VMID is still valid | |
389 | * @kvm: The VM's VMID to checkt | |
390 | * | |
391 | * return true if there is a new generation of VMIDs being used | |
392 | * | |
393 | * The hardware supports only 256 values with the value zero reserved for the | |
394 | * host, so we check if an assigned value belongs to a previous generation, | |
395 | * which which requires us to assign a new value. If we're the first to use a | |
396 | * VMID for the new generation, we must flush necessary caches and TLBs on all | |
397 | * CPUs. | |
398 | */ | |
399 | static bool need_new_vmid_gen(struct kvm *kvm) | |
400 | { | |
401 | return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); | |
402 | } | |
403 | ||
404 | /** | |
405 | * update_vttbr - Update the VTTBR with a valid VMID before the guest runs | |
406 | * @kvm The guest that we are about to run | |
407 | * | |
408 | * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the | |
409 | * VM has a valid VMID, otherwise assigns a new one and flushes corresponding | |
410 | * caches and TLBs. | |
411 | */ | |
412 | static void update_vttbr(struct kvm *kvm) | |
413 | { | |
414 | phys_addr_t pgd_phys; | |
415 | u64 vmid; | |
416 | ||
417 | if (!need_new_vmid_gen(kvm)) | |
418 | return; | |
419 | ||
420 | spin_lock(&kvm_vmid_lock); | |
421 | ||
422 | /* | |
423 | * We need to re-check the vmid_gen here to ensure that if another vcpu | |
424 | * already allocated a valid vmid for this vm, then this vcpu should | |
425 | * use the same vmid. | |
426 | */ | |
427 | if (!need_new_vmid_gen(kvm)) { | |
428 | spin_unlock(&kvm_vmid_lock); | |
429 | return; | |
430 | } | |
431 | ||
432 | /* First user of a new VMID generation? */ | |
433 | if (unlikely(kvm_next_vmid == 0)) { | |
434 | atomic64_inc(&kvm_vmid_gen); | |
435 | kvm_next_vmid = 1; | |
436 | ||
437 | /* | |
438 | * On SMP we know no other CPUs can use this CPU's or each | |
439 | * other's VMID after force_vm_exit returns since the | |
440 | * kvm_vmid_lock blocks them from reentry to the guest. | |
441 | */ | |
442 | force_vm_exit(cpu_all_mask); | |
443 | /* | |
444 | * Now broadcast TLB + ICACHE invalidation over the inner | |
445 | * shareable domain to make sure all data structures are | |
446 | * clean. | |
447 | */ | |
448 | kvm_call_hyp(__kvm_flush_vm_context); | |
449 | } | |
450 | ||
451 | kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); | |
452 | kvm->arch.vmid = kvm_next_vmid; | |
453 | kvm_next_vmid++; | |
454 | ||
455 | /* update vttbr to be used with the new vmid */ | |
456 | pgd_phys = virt_to_phys(kvm->arch.pgd); | |
457 | vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK; | |
458 | kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK; | |
459 | kvm->arch.vttbr |= vmid; | |
460 | ||
461 | spin_unlock(&kvm_vmid_lock); | |
462 | } | |
463 | ||
f7ed45be CD |
464 | static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) |
465 | { | |
466 | if (likely(vcpu->arch.has_run_once)) | |
467 | return 0; | |
468 | ||
469 | vcpu->arch.has_run_once = true; | |
aa024c2f | 470 | |
01ac5e34 MZ |
471 | /* |
472 | * Initialize the VGIC before running a vcpu the first time on | |
473 | * this VM. | |
474 | */ | |
475 | if (irqchip_in_kernel(vcpu->kvm) && | |
476 | unlikely(!vgic_initialized(vcpu->kvm))) { | |
477 | int ret = kvm_vgic_init(vcpu->kvm); | |
478 | if (ret) | |
479 | return ret; | |
480 | } | |
481 | ||
aa024c2f MZ |
482 | /* |
483 | * Handle the "start in power-off" case by calling into the | |
484 | * PSCI code. | |
485 | */ | |
486 | if (test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) { | |
487 | *vcpu_reg(vcpu, 0) = KVM_PSCI_FN_CPU_OFF; | |
488 | kvm_psci_call(vcpu); | |
489 | } | |
490 | ||
f7ed45be CD |
491 | return 0; |
492 | } | |
493 | ||
aa024c2f MZ |
494 | static void vcpu_pause(struct kvm_vcpu *vcpu) |
495 | { | |
496 | wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); | |
497 | ||
498 | wait_event_interruptible(*wq, !vcpu->arch.pause); | |
499 | } | |
500 | ||
e8180dca AP |
501 | static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) |
502 | { | |
503 | return vcpu->arch.target >= 0; | |
504 | } | |
505 | ||
f7ed45be CD |
506 | /** |
507 | * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code | |
508 | * @vcpu: The VCPU pointer | |
509 | * @run: The kvm_run structure pointer used for userspace state exchange | |
510 | * | |
511 | * This function is called through the VCPU_RUN ioctl called from user space. It | |
512 | * will execute VM code in a loop until the time slice for the process is used | |
513 | * or some emulation is needed from user space in which case the function will | |
514 | * return with return value 0 and with the kvm_run structure filled in with the | |
515 | * required data for the requested emulation. | |
516 | */ | |
749cf76c CD |
517 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) |
518 | { | |
f7ed45be CD |
519 | int ret; |
520 | sigset_t sigsaved; | |
521 | ||
e8180dca | 522 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
f7ed45be CD |
523 | return -ENOEXEC; |
524 | ||
525 | ret = kvm_vcpu_first_run_init(vcpu); | |
526 | if (ret) | |
527 | return ret; | |
528 | ||
45e96ea6 CD |
529 | if (run->exit_reason == KVM_EXIT_MMIO) { |
530 | ret = kvm_handle_mmio_return(vcpu, vcpu->run); | |
531 | if (ret) | |
532 | return ret; | |
533 | } | |
534 | ||
f7ed45be CD |
535 | if (vcpu->sigset_active) |
536 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
537 | ||
538 | ret = 1; | |
539 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
540 | while (ret > 0) { | |
541 | /* | |
542 | * Check conditions before entering the guest | |
543 | */ | |
544 | cond_resched(); | |
545 | ||
546 | update_vttbr(vcpu->kvm); | |
547 | ||
aa024c2f MZ |
548 | if (vcpu->arch.pause) |
549 | vcpu_pause(vcpu); | |
550 | ||
1a89dd91 | 551 | kvm_vgic_flush_hwstate(vcpu); |
c7e3ba64 | 552 | kvm_timer_flush_hwstate(vcpu); |
1a89dd91 | 553 | |
f7ed45be CD |
554 | local_irq_disable(); |
555 | ||
556 | /* | |
557 | * Re-check atomic conditions | |
558 | */ | |
559 | if (signal_pending(current)) { | |
560 | ret = -EINTR; | |
561 | run->exit_reason = KVM_EXIT_INTR; | |
562 | } | |
563 | ||
564 | if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) { | |
565 | local_irq_enable(); | |
c7e3ba64 | 566 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 | 567 | kvm_vgic_sync_hwstate(vcpu); |
f7ed45be CD |
568 | continue; |
569 | } | |
570 | ||
571 | /************************************************************** | |
572 | * Enter the guest | |
573 | */ | |
574 | trace_kvm_entry(*vcpu_pc(vcpu)); | |
575 | kvm_guest_enter(); | |
576 | vcpu->mode = IN_GUEST_MODE; | |
577 | ||
578 | ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); | |
579 | ||
580 | vcpu->mode = OUTSIDE_GUEST_MODE; | |
5b3e5e5b | 581 | vcpu->arch.last_pcpu = smp_processor_id(); |
f7ed45be CD |
582 | kvm_guest_exit(); |
583 | trace_kvm_exit(*vcpu_pc(vcpu)); | |
584 | /* | |
585 | * We may have taken a host interrupt in HYP mode (ie | |
586 | * while executing the guest). This interrupt is still | |
587 | * pending, as we haven't serviced it yet! | |
588 | * | |
589 | * We're now back in SVC mode, with interrupts | |
590 | * disabled. Enabling the interrupts now will have | |
591 | * the effect of taking the interrupt again, in SVC | |
592 | * mode this time. | |
593 | */ | |
594 | local_irq_enable(); | |
595 | ||
596 | /* | |
597 | * Back from guest | |
598 | *************************************************************/ | |
599 | ||
c7e3ba64 | 600 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 MZ |
601 | kvm_vgic_sync_hwstate(vcpu); |
602 | ||
f7ed45be CD |
603 | ret = handle_exit(vcpu, run, ret); |
604 | } | |
605 | ||
606 | if (vcpu->sigset_active) | |
607 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
608 | return ret; | |
749cf76c CD |
609 | } |
610 | ||
86ce8535 CD |
611 | static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) |
612 | { | |
613 | int bit_index; | |
614 | bool set; | |
615 | unsigned long *ptr; | |
616 | ||
617 | if (number == KVM_ARM_IRQ_CPU_IRQ) | |
618 | bit_index = __ffs(HCR_VI); | |
619 | else /* KVM_ARM_IRQ_CPU_FIQ */ | |
620 | bit_index = __ffs(HCR_VF); | |
621 | ||
622 | ptr = (unsigned long *)&vcpu->arch.irq_lines; | |
623 | if (level) | |
624 | set = test_and_set_bit(bit_index, ptr); | |
625 | else | |
626 | set = test_and_clear_bit(bit_index, ptr); | |
627 | ||
628 | /* | |
629 | * If we didn't change anything, no need to wake up or kick other CPUs | |
630 | */ | |
631 | if (set == level) | |
632 | return 0; | |
633 | ||
634 | /* | |
635 | * The vcpu irq_lines field was updated, wake up sleeping VCPUs and | |
636 | * trigger a world-switch round on the running physical CPU to set the | |
637 | * virtual IRQ/FIQ fields in the HCR appropriately. | |
638 | */ | |
639 | kvm_vcpu_kick(vcpu); | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
79558f11 AG |
644 | int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, |
645 | bool line_status) | |
86ce8535 CD |
646 | { |
647 | u32 irq = irq_level->irq; | |
648 | unsigned int irq_type, vcpu_idx, irq_num; | |
649 | int nrcpus = atomic_read(&kvm->online_vcpus); | |
650 | struct kvm_vcpu *vcpu = NULL; | |
651 | bool level = irq_level->level; | |
652 | ||
653 | irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; | |
654 | vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; | |
655 | irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; | |
656 | ||
657 | trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); | |
658 | ||
5863c2ce MZ |
659 | switch (irq_type) { |
660 | case KVM_ARM_IRQ_TYPE_CPU: | |
661 | if (irqchip_in_kernel(kvm)) | |
662 | return -ENXIO; | |
86ce8535 | 663 | |
5863c2ce MZ |
664 | if (vcpu_idx >= nrcpus) |
665 | return -EINVAL; | |
86ce8535 | 666 | |
5863c2ce MZ |
667 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); |
668 | if (!vcpu) | |
669 | return -EINVAL; | |
86ce8535 | 670 | |
5863c2ce MZ |
671 | if (irq_num > KVM_ARM_IRQ_CPU_FIQ) |
672 | return -EINVAL; | |
673 | ||
674 | return vcpu_interrupt_line(vcpu, irq_num, level); | |
675 | case KVM_ARM_IRQ_TYPE_PPI: | |
676 | if (!irqchip_in_kernel(kvm)) | |
677 | return -ENXIO; | |
678 | ||
679 | if (vcpu_idx >= nrcpus) | |
680 | return -EINVAL; | |
681 | ||
682 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); | |
683 | if (!vcpu) | |
684 | return -EINVAL; | |
685 | ||
686 | if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) | |
687 | return -EINVAL; | |
86ce8535 | 688 | |
5863c2ce MZ |
689 | return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); |
690 | case KVM_ARM_IRQ_TYPE_SPI: | |
691 | if (!irqchip_in_kernel(kvm)) | |
692 | return -ENXIO; | |
693 | ||
694 | if (irq_num < VGIC_NR_PRIVATE_IRQS || | |
695 | irq_num > KVM_ARM_IRQ_GIC_MAX) | |
696 | return -EINVAL; | |
697 | ||
698 | return kvm_vgic_inject_irq(kvm, 0, irq_num, level); | |
699 | } | |
700 | ||
701 | return -EINVAL; | |
86ce8535 CD |
702 | } |
703 | ||
749cf76c CD |
704 | long kvm_arch_vcpu_ioctl(struct file *filp, |
705 | unsigned int ioctl, unsigned long arg) | |
706 | { | |
707 | struct kvm_vcpu *vcpu = filp->private_data; | |
708 | void __user *argp = (void __user *)arg; | |
709 | ||
710 | switch (ioctl) { | |
711 | case KVM_ARM_VCPU_INIT: { | |
712 | struct kvm_vcpu_init init; | |
713 | ||
714 | if (copy_from_user(&init, argp, sizeof(init))) | |
715 | return -EFAULT; | |
716 | ||
717 | return kvm_vcpu_set_target(vcpu, &init); | |
718 | ||
719 | } | |
720 | case KVM_SET_ONE_REG: | |
721 | case KVM_GET_ONE_REG: { | |
722 | struct kvm_one_reg reg; | |
e8180dca AP |
723 | |
724 | if (unlikely(!kvm_vcpu_initialized(vcpu))) | |
725 | return -ENOEXEC; | |
726 | ||
749cf76c CD |
727 | if (copy_from_user(®, argp, sizeof(reg))) |
728 | return -EFAULT; | |
729 | if (ioctl == KVM_SET_ONE_REG) | |
730 | return kvm_arm_set_reg(vcpu, ®); | |
731 | else | |
732 | return kvm_arm_get_reg(vcpu, ®); | |
733 | } | |
734 | case KVM_GET_REG_LIST: { | |
735 | struct kvm_reg_list __user *user_list = argp; | |
736 | struct kvm_reg_list reg_list; | |
737 | unsigned n; | |
738 | ||
e8180dca AP |
739 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
740 | return -ENOEXEC; | |
741 | ||
749cf76c CD |
742 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) |
743 | return -EFAULT; | |
744 | n = reg_list.n; | |
745 | reg_list.n = kvm_arm_num_regs(vcpu); | |
746 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) | |
747 | return -EFAULT; | |
748 | if (n < reg_list.n) | |
749 | return -E2BIG; | |
750 | return kvm_arm_copy_reg_indices(vcpu, user_list->reg); | |
751 | } | |
752 | default: | |
753 | return -EINVAL; | |
754 | } | |
755 | } | |
756 | ||
757 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) | |
758 | { | |
759 | return -EINVAL; | |
760 | } | |
761 | ||
3401d546 CD |
762 | static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, |
763 | struct kvm_arm_device_addr *dev_addr) | |
764 | { | |
330690cd CD |
765 | unsigned long dev_id, type; |
766 | ||
767 | dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> | |
768 | KVM_ARM_DEVICE_ID_SHIFT; | |
769 | type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> | |
770 | KVM_ARM_DEVICE_TYPE_SHIFT; | |
771 | ||
772 | switch (dev_id) { | |
773 | case KVM_ARM_DEVICE_VGIC_V2: | |
774 | if (!vgic_present) | |
775 | return -ENXIO; | |
776 | return kvm_vgic_set_addr(kvm, type, dev_addr->addr); | |
777 | default: | |
778 | return -ENODEV; | |
779 | } | |
3401d546 CD |
780 | } |
781 | ||
749cf76c CD |
782 | long kvm_arch_vm_ioctl(struct file *filp, |
783 | unsigned int ioctl, unsigned long arg) | |
784 | { | |
3401d546 CD |
785 | struct kvm *kvm = filp->private_data; |
786 | void __user *argp = (void __user *)arg; | |
787 | ||
788 | switch (ioctl) { | |
5863c2ce MZ |
789 | case KVM_CREATE_IRQCHIP: { |
790 | if (vgic_present) | |
791 | return kvm_vgic_create(kvm); | |
792 | else | |
793 | return -ENXIO; | |
794 | } | |
3401d546 CD |
795 | case KVM_ARM_SET_DEVICE_ADDR: { |
796 | struct kvm_arm_device_addr dev_addr; | |
797 | ||
798 | if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) | |
799 | return -EFAULT; | |
800 | return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); | |
801 | } | |
42c4e0c7 AP |
802 | case KVM_ARM_PREFERRED_TARGET: { |
803 | int err; | |
804 | struct kvm_vcpu_init init; | |
805 | ||
806 | err = kvm_vcpu_preferred_target(&init); | |
807 | if (err) | |
808 | return err; | |
809 | ||
810 | if (copy_to_user(argp, &init, sizeof(init))) | |
811 | return -EFAULT; | |
812 | ||
813 | return 0; | |
814 | } | |
3401d546 CD |
815 | default: |
816 | return -EINVAL; | |
817 | } | |
749cf76c CD |
818 | } |
819 | ||
d157f4a5 | 820 | static void cpu_init_hyp_mode(void *dummy) |
342cd0ab | 821 | { |
dac288f7 MZ |
822 | phys_addr_t boot_pgd_ptr; |
823 | phys_addr_t pgd_ptr; | |
342cd0ab CD |
824 | unsigned long hyp_stack_ptr; |
825 | unsigned long stack_page; | |
826 | unsigned long vector_ptr; | |
827 | ||
828 | /* Switch from the HYP stub to our own HYP init vector */ | |
5a677ce0 | 829 | __hyp_set_vectors(kvm_get_idmap_vector()); |
342cd0ab | 830 | |
dac288f7 MZ |
831 | boot_pgd_ptr = kvm_mmu_get_boot_httbr(); |
832 | pgd_ptr = kvm_mmu_get_httbr(); | |
1436c1aa | 833 | stack_page = __this_cpu_read(kvm_arm_hyp_stack_page); |
342cd0ab CD |
834 | hyp_stack_ptr = stack_page + PAGE_SIZE; |
835 | vector_ptr = (unsigned long)__kvm_hyp_vector; | |
836 | ||
5a677ce0 | 837 | __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr); |
342cd0ab CD |
838 | } |
839 | ||
d157f4a5 MZ |
840 | static int hyp_init_cpu_notify(struct notifier_block *self, |
841 | unsigned long action, void *cpu) | |
842 | { | |
843 | switch (action) { | |
844 | case CPU_STARTING: | |
845 | case CPU_STARTING_FROZEN: | |
846 | cpu_init_hyp_mode(NULL); | |
847 | break; | |
848 | } | |
849 | ||
850 | return NOTIFY_OK; | |
342cd0ab CD |
851 | } |
852 | ||
d157f4a5 MZ |
853 | static struct notifier_block hyp_init_cpu_nb = { |
854 | .notifier_call = hyp_init_cpu_notify, | |
855 | }; | |
856 | ||
1fcf7ce0 LP |
857 | #ifdef CONFIG_CPU_PM |
858 | static int hyp_init_cpu_pm_notifier(struct notifier_block *self, | |
859 | unsigned long cmd, | |
860 | void *v) | |
861 | { | |
862 | if (cmd == CPU_PM_EXIT) { | |
863 | cpu_init_hyp_mode(NULL); | |
864 | return NOTIFY_OK; | |
865 | } | |
866 | ||
867 | return NOTIFY_DONE; | |
868 | } | |
869 | ||
870 | static struct notifier_block hyp_init_cpu_pm_nb = { | |
871 | .notifier_call = hyp_init_cpu_pm_notifier, | |
872 | }; | |
873 | ||
874 | static void __init hyp_cpu_pm_init(void) | |
875 | { | |
876 | cpu_pm_register_notifier(&hyp_init_cpu_pm_nb); | |
877 | } | |
878 | #else | |
879 | static inline void hyp_cpu_pm_init(void) | |
880 | { | |
881 | } | |
882 | #endif | |
883 | ||
342cd0ab CD |
884 | /** |
885 | * Inits Hyp-mode on all online CPUs | |
886 | */ | |
887 | static int init_hyp_mode(void) | |
888 | { | |
342cd0ab CD |
889 | int cpu; |
890 | int err = 0; | |
891 | ||
892 | /* | |
893 | * Allocate Hyp PGD and setup Hyp identity mapping | |
894 | */ | |
895 | err = kvm_mmu_init(); | |
896 | if (err) | |
897 | goto out_err; | |
898 | ||
899 | /* | |
900 | * It is probably enough to obtain the default on one | |
901 | * CPU. It's unlikely to be different on the others. | |
902 | */ | |
903 | hyp_default_vectors = __hyp_get_vectors(); | |
904 | ||
905 | /* | |
906 | * Allocate stack pages for Hypervisor-mode | |
907 | */ | |
908 | for_each_possible_cpu(cpu) { | |
909 | unsigned long stack_page; | |
910 | ||
911 | stack_page = __get_free_page(GFP_KERNEL); | |
912 | if (!stack_page) { | |
913 | err = -ENOMEM; | |
914 | goto out_free_stack_pages; | |
915 | } | |
916 | ||
917 | per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; | |
918 | } | |
919 | ||
342cd0ab CD |
920 | /* |
921 | * Map the Hyp-code called directly from the host | |
922 | */ | |
923 | err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end); | |
924 | if (err) { | |
925 | kvm_err("Cannot map world-switch code\n"); | |
926 | goto out_free_mappings; | |
927 | } | |
928 | ||
929 | /* | |
930 | * Map the Hyp stack pages | |
931 | */ | |
932 | for_each_possible_cpu(cpu) { | |
933 | char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); | |
934 | err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE); | |
935 | ||
936 | if (err) { | |
937 | kvm_err("Cannot map hyp stack\n"); | |
938 | goto out_free_mappings; | |
939 | } | |
940 | } | |
941 | ||
942 | /* | |
3de50da6 | 943 | * Map the host CPU structures |
342cd0ab | 944 | */ |
3de50da6 MZ |
945 | kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t); |
946 | if (!kvm_host_cpu_state) { | |
342cd0ab | 947 | err = -ENOMEM; |
3de50da6 | 948 | kvm_err("Cannot allocate host CPU state\n"); |
342cd0ab CD |
949 | goto out_free_mappings; |
950 | } | |
951 | ||
952 | for_each_possible_cpu(cpu) { | |
3de50da6 | 953 | kvm_cpu_context_t *cpu_ctxt; |
342cd0ab | 954 | |
3de50da6 MZ |
955 | cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu); |
956 | err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1); | |
342cd0ab CD |
957 | |
958 | if (err) { | |
3de50da6 MZ |
959 | kvm_err("Cannot map host CPU state: %d\n", err); |
960 | goto out_free_context; | |
342cd0ab CD |
961 | } |
962 | } | |
963 | ||
d157f4a5 MZ |
964 | /* |
965 | * Execute the init code on each CPU. | |
966 | */ | |
967 | on_each_cpu(cpu_init_hyp_mode, NULL, 1); | |
968 | ||
1a89dd91 MZ |
969 | /* |
970 | * Init HYP view of VGIC | |
971 | */ | |
972 | err = kvm_vgic_hyp_init(); | |
973 | if (err) | |
3de50da6 | 974 | goto out_free_context; |
1a89dd91 | 975 | |
01ac5e34 MZ |
976 | #ifdef CONFIG_KVM_ARM_VGIC |
977 | vgic_present = true; | |
978 | #endif | |
979 | ||
967f8427 MZ |
980 | /* |
981 | * Init HYP architected timer support | |
982 | */ | |
983 | err = kvm_timer_hyp_init(); | |
984 | if (err) | |
985 | goto out_free_mappings; | |
986 | ||
d157f4a5 MZ |
987 | #ifndef CONFIG_HOTPLUG_CPU |
988 | free_boot_hyp_pgd(); | |
989 | #endif | |
990 | ||
210552c1 MZ |
991 | kvm_perf_init(); |
992 | ||
342cd0ab | 993 | kvm_info("Hyp mode initialized successfully\n"); |
210552c1 | 994 | |
342cd0ab | 995 | return 0; |
3de50da6 MZ |
996 | out_free_context: |
997 | free_percpu(kvm_host_cpu_state); | |
342cd0ab | 998 | out_free_mappings: |
4f728276 | 999 | free_hyp_pgds(); |
342cd0ab CD |
1000 | out_free_stack_pages: |
1001 | for_each_possible_cpu(cpu) | |
1002 | free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); | |
1003 | out_err: | |
1004 | kvm_err("error initializing Hyp mode: %d\n", err); | |
1005 | return err; | |
1006 | } | |
1007 | ||
d4e071ce AP |
1008 | static void check_kvm_target_cpu(void *ret) |
1009 | { | |
1010 | *(int *)ret = kvm_target_cpu(); | |
1011 | } | |
1012 | ||
342cd0ab CD |
1013 | /** |
1014 | * Initialize Hyp-mode and memory mappings on all CPUs. | |
1015 | */ | |
749cf76c CD |
1016 | int kvm_arch_init(void *opaque) |
1017 | { | |
342cd0ab | 1018 | int err; |
d4e071ce | 1019 | int ret, cpu; |
342cd0ab CD |
1020 | |
1021 | if (!is_hyp_mode_available()) { | |
1022 | kvm_err("HYP mode not available\n"); | |
1023 | return -ENODEV; | |
1024 | } | |
1025 | ||
d4e071ce AP |
1026 | for_each_online_cpu(cpu) { |
1027 | smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1); | |
1028 | if (ret < 0) { | |
1029 | kvm_err("Error, CPU %d not supported!\n", cpu); | |
1030 | return -ENODEV; | |
1031 | } | |
342cd0ab CD |
1032 | } |
1033 | ||
1034 | err = init_hyp_mode(); | |
1035 | if (err) | |
1036 | goto out_err; | |
1037 | ||
d157f4a5 MZ |
1038 | err = register_cpu_notifier(&hyp_init_cpu_nb); |
1039 | if (err) { | |
1040 | kvm_err("Cannot register HYP init CPU notifier (%d)\n", err); | |
1041 | goto out_err; | |
1042 | } | |
1043 | ||
1fcf7ce0 LP |
1044 | hyp_cpu_pm_init(); |
1045 | ||
5b3e5e5b | 1046 | kvm_coproc_table_init(); |
749cf76c | 1047 | return 0; |
342cd0ab CD |
1048 | out_err: |
1049 | return err; | |
749cf76c CD |
1050 | } |
1051 | ||
1052 | /* NOP: Compiling as a module not supported */ | |
1053 | void kvm_arch_exit(void) | |
1054 | { | |
210552c1 | 1055 | kvm_perf_teardown(); |
749cf76c CD |
1056 | } |
1057 | ||
1058 | static int arm_init(void) | |
1059 | { | |
1060 | int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); | |
1061 | return rc; | |
1062 | } | |
1063 | ||
1064 | module_init(arm_init); |