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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> |
749cf76c CD |
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> | |
86ce8535 | 28 | #include <linux/kvm.h> |
749cf76c CD |
29 | #include <trace/events/kvm.h> |
30 | ||
31 | #define CREATE_TRACE_POINTS | |
32 | #include "trace.h" | |
33 | ||
749cf76c CD |
34 | #include <asm/uaccess.h> |
35 | #include <asm/ptrace.h> | |
36 | #include <asm/mman.h> | |
342cd0ab | 37 | #include <asm/tlbflush.h> |
5b3e5e5b | 38 | #include <asm/cacheflush.h> |
342cd0ab CD |
39 | #include <asm/virt.h> |
40 | #include <asm/kvm_arm.h> | |
41 | #include <asm/kvm_asm.h> | |
42 | #include <asm/kvm_mmu.h> | |
f7ed45be | 43 | #include <asm/kvm_emulate.h> |
5b3e5e5b | 44 | #include <asm/kvm_coproc.h> |
aa024c2f | 45 | #include <asm/kvm_psci.h> |
749cf76c CD |
46 | |
47 | #ifdef REQUIRES_VIRT | |
48 | __asm__(".arch_extension virt"); | |
49 | #endif | |
50 | ||
342cd0ab | 51 | static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); |
3de50da6 | 52 | static kvm_cpu_context_t __percpu *kvm_host_cpu_state; |
342cd0ab CD |
53 | static unsigned long hyp_default_vectors; |
54 | ||
1638a12d MZ |
55 | /* Per-CPU variable containing the currently running vcpu. */ |
56 | static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu); | |
57 | ||
f7ed45be CD |
58 | /* The VMID used in the VTTBR */ |
59 | static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); | |
60 | static u8 kvm_next_vmid; | |
61 | static DEFINE_SPINLOCK(kvm_vmid_lock); | |
342cd0ab | 62 | |
1a89dd91 MZ |
63 | static bool vgic_present; |
64 | ||
1638a12d MZ |
65 | static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu) |
66 | { | |
67 | BUG_ON(preemptible()); | |
1436c1aa | 68 | __this_cpu_write(kvm_arm_running_vcpu, vcpu); |
1638a12d MZ |
69 | } |
70 | ||
71 | /** | |
72 | * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU. | |
73 | * Must be called from non-preemptible context | |
74 | */ | |
75 | struct kvm_vcpu *kvm_arm_get_running_vcpu(void) | |
76 | { | |
77 | BUG_ON(preemptible()); | |
1436c1aa | 78 | return __this_cpu_read(kvm_arm_running_vcpu); |
1638a12d MZ |
79 | } |
80 | ||
81 | /** | |
82 | * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus. | |
83 | */ | |
84 | struct kvm_vcpu __percpu **kvm_get_running_vcpus(void) | |
85 | { | |
86 | return &kvm_arm_running_vcpu; | |
87 | } | |
88 | ||
749cf76c CD |
89 | int kvm_arch_hardware_enable(void *garbage) |
90 | { | |
91 | return 0; | |
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 | void kvm_arch_hardware_disable(void *garbage) | |
100 | { | |
101 | } | |
102 | ||
103 | int kvm_arch_hardware_setup(void) | |
104 | { | |
105 | return 0; | |
106 | } | |
107 | ||
108 | void kvm_arch_hardware_unsetup(void) | |
109 | { | |
110 | } | |
111 | ||
112 | void kvm_arch_check_processor_compat(void *rtn) | |
113 | { | |
114 | *(int *)rtn = 0; | |
115 | } | |
116 | ||
117 | void kvm_arch_sync_events(struct kvm *kvm) | |
118 | { | |
119 | } | |
120 | ||
d5d8184d CD |
121 | /** |
122 | * kvm_arch_init_vm - initializes a VM data structure | |
123 | * @kvm: pointer to the KVM struct | |
124 | */ | |
749cf76c CD |
125 | int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) |
126 | { | |
d5d8184d CD |
127 | int ret = 0; |
128 | ||
749cf76c CD |
129 | if (type) |
130 | return -EINVAL; | |
131 | ||
d5d8184d CD |
132 | ret = kvm_alloc_stage2_pgd(kvm); |
133 | if (ret) | |
134 | goto out_fail_alloc; | |
135 | ||
136 | ret = create_hyp_mappings(kvm, kvm + 1); | |
137 | if (ret) | |
138 | goto out_free_stage2_pgd; | |
139 | ||
a1a64387 CD |
140 | kvm_timer_init(kvm); |
141 | ||
d5d8184d CD |
142 | /* Mark the initial VMID generation invalid */ |
143 | kvm->arch.vmid_gen = 0; | |
144 | ||
145 | return ret; | |
146 | out_free_stage2_pgd: | |
147 | kvm_free_stage2_pgd(kvm); | |
148 | out_fail_alloc: | |
149 | return ret; | |
749cf76c CD |
150 | } |
151 | ||
152 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
153 | { | |
154 | return VM_FAULT_SIGBUS; | |
155 | } | |
156 | ||
5587027c | 157 | void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, |
749cf76c CD |
158 | struct kvm_memory_slot *dont) |
159 | { | |
160 | } | |
161 | ||
5587027c AK |
162 | int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, |
163 | unsigned long npages) | |
749cf76c CD |
164 | { |
165 | return 0; | |
166 | } | |
167 | ||
d5d8184d CD |
168 | /** |
169 | * kvm_arch_destroy_vm - destroy the VM data structure | |
170 | * @kvm: pointer to the KVM struct | |
171 | */ | |
749cf76c CD |
172 | void kvm_arch_destroy_vm(struct kvm *kvm) |
173 | { | |
174 | int i; | |
175 | ||
d5d8184d CD |
176 | kvm_free_stage2_pgd(kvm); |
177 | ||
749cf76c CD |
178 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
179 | if (kvm->vcpus[i]) { | |
180 | kvm_arch_vcpu_free(kvm->vcpus[i]); | |
181 | kvm->vcpus[i] = NULL; | |
182 | } | |
183 | } | |
184 | } | |
185 | ||
186 | int kvm_dev_ioctl_check_extension(long ext) | |
187 | { | |
188 | int r; | |
189 | switch (ext) { | |
1a89dd91 MZ |
190 | case KVM_CAP_IRQCHIP: |
191 | r = vgic_present; | |
192 | break; | |
749cf76c CD |
193 | case KVM_CAP_USER_MEMORY: |
194 | case KVM_CAP_SYNC_MMU: | |
195 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
196 | case KVM_CAP_ONE_REG: | |
aa024c2f | 197 | case KVM_CAP_ARM_PSCI: |
749cf76c CD |
198 | r = 1; |
199 | break; | |
200 | case KVM_CAP_COALESCED_MMIO: | |
201 | r = KVM_COALESCED_MMIO_PAGE_OFFSET; | |
202 | break; | |
3401d546 CD |
203 | case KVM_CAP_ARM_SET_DEVICE_ADDR: |
204 | r = 1; | |
ca46e10f | 205 | break; |
749cf76c CD |
206 | case KVM_CAP_NR_VCPUS: |
207 | r = num_online_cpus(); | |
208 | break; | |
209 | case KVM_CAP_MAX_VCPUS: | |
210 | r = KVM_MAX_VCPUS; | |
211 | break; | |
212 | default: | |
17b1e31f | 213 | r = kvm_arch_dev_ioctl_check_extension(ext); |
749cf76c CD |
214 | break; |
215 | } | |
216 | return r; | |
217 | } | |
218 | ||
219 | long kvm_arch_dev_ioctl(struct file *filp, | |
220 | unsigned int ioctl, unsigned long arg) | |
221 | { | |
222 | return -EINVAL; | |
223 | } | |
224 | ||
e59dbe09 TY |
225 | void kvm_arch_memslots_updated(struct kvm *kvm) |
226 | { | |
227 | } | |
228 | ||
749cf76c CD |
229 | int kvm_arch_prepare_memory_region(struct kvm *kvm, |
230 | struct kvm_memory_slot *memslot, | |
749cf76c | 231 | struct kvm_userspace_memory_region *mem, |
7b6195a9 | 232 | enum kvm_mr_change change) |
749cf76c CD |
233 | { |
234 | return 0; | |
235 | } | |
236 | ||
237 | void kvm_arch_commit_memory_region(struct kvm *kvm, | |
238 | struct kvm_userspace_memory_region *mem, | |
8482644a TY |
239 | const struct kvm_memory_slot *old, |
240 | enum kvm_mr_change change) | |
749cf76c CD |
241 | { |
242 | } | |
243 | ||
244 | void kvm_arch_flush_shadow_all(struct kvm *kvm) | |
245 | { | |
246 | } | |
247 | ||
248 | void kvm_arch_flush_shadow_memslot(struct kvm *kvm, | |
249 | struct kvm_memory_slot *slot) | |
250 | { | |
251 | } | |
252 | ||
253 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) | |
254 | { | |
255 | int err; | |
256 | struct kvm_vcpu *vcpu; | |
257 | ||
258 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
259 | if (!vcpu) { | |
260 | err = -ENOMEM; | |
261 | goto out; | |
262 | } | |
263 | ||
264 | err = kvm_vcpu_init(vcpu, kvm, id); | |
265 | if (err) | |
266 | goto free_vcpu; | |
267 | ||
d5d8184d CD |
268 | err = create_hyp_mappings(vcpu, vcpu + 1); |
269 | if (err) | |
270 | goto vcpu_uninit; | |
271 | ||
749cf76c | 272 | return vcpu; |
d5d8184d CD |
273 | vcpu_uninit: |
274 | kvm_vcpu_uninit(vcpu); | |
749cf76c CD |
275 | free_vcpu: |
276 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
277 | out: | |
278 | return ERR_PTR(err); | |
279 | } | |
280 | ||
281 | int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) | |
282 | { | |
283 | return 0; | |
284 | } | |
285 | ||
286 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
287 | { | |
d5d8184d | 288 | kvm_mmu_free_memory_caches(vcpu); |
967f8427 | 289 | kvm_timer_vcpu_terminate(vcpu); |
d5d8184d | 290 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
749cf76c CD |
291 | } |
292 | ||
293 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
294 | { | |
295 | kvm_arch_vcpu_free(vcpu); | |
296 | } | |
297 | ||
298 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
299 | { | |
300 | return 0; | |
301 | } | |
302 | ||
749cf76c CD |
303 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) |
304 | { | |
1a89dd91 MZ |
305 | int ret; |
306 | ||
f7ed45be CD |
307 | /* Force users to call KVM_ARM_VCPU_INIT */ |
308 | vcpu->arch.target = -1; | |
1a89dd91 MZ |
309 | |
310 | /* Set up VGIC */ | |
311 | ret = kvm_vgic_vcpu_init(vcpu); | |
312 | if (ret) | |
313 | return ret; | |
314 | ||
967f8427 MZ |
315 | /* Set up the timer */ |
316 | kvm_timer_vcpu_init(vcpu); | |
317 | ||
749cf76c CD |
318 | return 0; |
319 | } | |
320 | ||
321 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) | |
322 | { | |
323 | } | |
324 | ||
325 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
326 | { | |
86ce8535 | 327 | vcpu->cpu = cpu; |
3de50da6 | 328 | vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state); |
5b3e5e5b CD |
329 | |
330 | /* | |
331 | * Check whether this vcpu requires the cache to be flushed on | |
332 | * this physical CPU. This is a consequence of doing dcache | |
333 | * operations by set/way on this vcpu. We do it here to be in | |
334 | * a non-preemptible section. | |
335 | */ | |
336 | if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush)) | |
337 | flush_cache_all(); /* We'd really want v7_flush_dcache_all() */ | |
1638a12d MZ |
338 | |
339 | kvm_arm_set_running_vcpu(vcpu); | |
749cf76c CD |
340 | } |
341 | ||
342 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
343 | { | |
1638a12d | 344 | kvm_arm_set_running_vcpu(NULL); |
749cf76c CD |
345 | } |
346 | ||
347 | int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, | |
348 | struct kvm_guest_debug *dbg) | |
349 | { | |
350 | return -EINVAL; | |
351 | } | |
352 | ||
353 | ||
354 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, | |
355 | struct kvm_mp_state *mp_state) | |
356 | { | |
357 | return -EINVAL; | |
358 | } | |
359 | ||
360 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
361 | struct kvm_mp_state *mp_state) | |
362 | { | |
363 | return -EINVAL; | |
364 | } | |
365 | ||
5b3e5e5b CD |
366 | /** |
367 | * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled | |
368 | * @v: The VCPU pointer | |
369 | * | |
370 | * If the guest CPU is not waiting for interrupts or an interrupt line is | |
371 | * asserted, the CPU is by definition runnable. | |
372 | */ | |
749cf76c CD |
373 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) |
374 | { | |
1a89dd91 | 375 | return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v); |
749cf76c CD |
376 | } |
377 | ||
f7ed45be CD |
378 | /* Just ensure a guest exit from a particular CPU */ |
379 | static void exit_vm_noop(void *info) | |
380 | { | |
381 | } | |
382 | ||
383 | void force_vm_exit(const cpumask_t *mask) | |
384 | { | |
385 | smp_call_function_many(mask, exit_vm_noop, NULL, true); | |
386 | } | |
387 | ||
388 | /** | |
389 | * need_new_vmid_gen - check that the VMID is still valid | |
390 | * @kvm: The VM's VMID to checkt | |
391 | * | |
392 | * return true if there is a new generation of VMIDs being used | |
393 | * | |
394 | * The hardware supports only 256 values with the value zero reserved for the | |
395 | * host, so we check if an assigned value belongs to a previous generation, | |
396 | * which which requires us to assign a new value. If we're the first to use a | |
397 | * VMID for the new generation, we must flush necessary caches and TLBs on all | |
398 | * CPUs. | |
399 | */ | |
400 | static bool need_new_vmid_gen(struct kvm *kvm) | |
401 | { | |
402 | return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); | |
403 | } | |
404 | ||
405 | /** | |
406 | * update_vttbr - Update the VTTBR with a valid VMID before the guest runs | |
407 | * @kvm The guest that we are about to run | |
408 | * | |
409 | * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the | |
410 | * VM has a valid VMID, otherwise assigns a new one and flushes corresponding | |
411 | * caches and TLBs. | |
412 | */ | |
413 | static void update_vttbr(struct kvm *kvm) | |
414 | { | |
415 | phys_addr_t pgd_phys; | |
416 | u64 vmid; | |
417 | ||
418 | if (!need_new_vmid_gen(kvm)) | |
419 | return; | |
420 | ||
421 | spin_lock(&kvm_vmid_lock); | |
422 | ||
423 | /* | |
424 | * We need to re-check the vmid_gen here to ensure that if another vcpu | |
425 | * already allocated a valid vmid for this vm, then this vcpu should | |
426 | * use the same vmid. | |
427 | */ | |
428 | if (!need_new_vmid_gen(kvm)) { | |
429 | spin_unlock(&kvm_vmid_lock); | |
430 | return; | |
431 | } | |
432 | ||
433 | /* First user of a new VMID generation? */ | |
434 | if (unlikely(kvm_next_vmid == 0)) { | |
435 | atomic64_inc(&kvm_vmid_gen); | |
436 | kvm_next_vmid = 1; | |
437 | ||
438 | /* | |
439 | * On SMP we know no other CPUs can use this CPU's or each | |
440 | * other's VMID after force_vm_exit returns since the | |
441 | * kvm_vmid_lock blocks them from reentry to the guest. | |
442 | */ | |
443 | force_vm_exit(cpu_all_mask); | |
444 | /* | |
445 | * Now broadcast TLB + ICACHE invalidation over the inner | |
446 | * shareable domain to make sure all data structures are | |
447 | * clean. | |
448 | */ | |
449 | kvm_call_hyp(__kvm_flush_vm_context); | |
450 | } | |
451 | ||
452 | kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); | |
453 | kvm->arch.vmid = kvm_next_vmid; | |
454 | kvm_next_vmid++; | |
455 | ||
456 | /* update vttbr to be used with the new vmid */ | |
457 | pgd_phys = virt_to_phys(kvm->arch.pgd); | |
458 | vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK; | |
459 | kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK; | |
460 | kvm->arch.vttbr |= vmid; | |
461 | ||
462 | spin_unlock(&kvm_vmid_lock); | |
463 | } | |
464 | ||
f7ed45be CD |
465 | static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) |
466 | { | |
467 | if (likely(vcpu->arch.has_run_once)) | |
468 | return 0; | |
469 | ||
470 | vcpu->arch.has_run_once = true; | |
aa024c2f | 471 | |
01ac5e34 MZ |
472 | /* |
473 | * Initialize the VGIC before running a vcpu the first time on | |
474 | * this VM. | |
475 | */ | |
476 | if (irqchip_in_kernel(vcpu->kvm) && | |
477 | unlikely(!vgic_initialized(vcpu->kvm))) { | |
478 | int ret = kvm_vgic_init(vcpu->kvm); | |
479 | if (ret) | |
480 | return ret; | |
481 | } | |
482 | ||
aa024c2f MZ |
483 | /* |
484 | * Handle the "start in power-off" case by calling into the | |
485 | * PSCI code. | |
486 | */ | |
487 | if (test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) { | |
488 | *vcpu_reg(vcpu, 0) = KVM_PSCI_FN_CPU_OFF; | |
489 | kvm_psci_call(vcpu); | |
490 | } | |
491 | ||
f7ed45be CD |
492 | return 0; |
493 | } | |
494 | ||
aa024c2f MZ |
495 | static void vcpu_pause(struct kvm_vcpu *vcpu) |
496 | { | |
497 | wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); | |
498 | ||
499 | wait_event_interruptible(*wq, !vcpu->arch.pause); | |
500 | } | |
501 | ||
e8180dca AP |
502 | static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) |
503 | { | |
504 | return vcpu->arch.target >= 0; | |
505 | } | |
506 | ||
f7ed45be CD |
507 | /** |
508 | * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code | |
509 | * @vcpu: The VCPU pointer | |
510 | * @run: The kvm_run structure pointer used for userspace state exchange | |
511 | * | |
512 | * This function is called through the VCPU_RUN ioctl called from user space. It | |
513 | * will execute VM code in a loop until the time slice for the process is used | |
514 | * or some emulation is needed from user space in which case the function will | |
515 | * return with return value 0 and with the kvm_run structure filled in with the | |
516 | * required data for the requested emulation. | |
517 | */ | |
749cf76c CD |
518 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) |
519 | { | |
f7ed45be CD |
520 | int ret; |
521 | sigset_t sigsaved; | |
522 | ||
e8180dca | 523 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
f7ed45be CD |
524 | return -ENOEXEC; |
525 | ||
526 | ret = kvm_vcpu_first_run_init(vcpu); | |
527 | if (ret) | |
528 | return ret; | |
529 | ||
45e96ea6 CD |
530 | if (run->exit_reason == KVM_EXIT_MMIO) { |
531 | ret = kvm_handle_mmio_return(vcpu, vcpu->run); | |
532 | if (ret) | |
533 | return ret; | |
534 | } | |
535 | ||
f7ed45be CD |
536 | if (vcpu->sigset_active) |
537 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
538 | ||
539 | ret = 1; | |
540 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
541 | while (ret > 0) { | |
542 | /* | |
543 | * Check conditions before entering the guest | |
544 | */ | |
545 | cond_resched(); | |
546 | ||
547 | update_vttbr(vcpu->kvm); | |
548 | ||
aa024c2f MZ |
549 | if (vcpu->arch.pause) |
550 | vcpu_pause(vcpu); | |
551 | ||
1a89dd91 | 552 | kvm_vgic_flush_hwstate(vcpu); |
c7e3ba64 | 553 | kvm_timer_flush_hwstate(vcpu); |
1a89dd91 | 554 | |
f7ed45be CD |
555 | local_irq_disable(); |
556 | ||
557 | /* | |
558 | * Re-check atomic conditions | |
559 | */ | |
560 | if (signal_pending(current)) { | |
561 | ret = -EINTR; | |
562 | run->exit_reason = KVM_EXIT_INTR; | |
563 | } | |
564 | ||
565 | if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) { | |
566 | local_irq_enable(); | |
c7e3ba64 | 567 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 | 568 | kvm_vgic_sync_hwstate(vcpu); |
f7ed45be CD |
569 | continue; |
570 | } | |
571 | ||
572 | /************************************************************** | |
573 | * Enter the guest | |
574 | */ | |
575 | trace_kvm_entry(*vcpu_pc(vcpu)); | |
576 | kvm_guest_enter(); | |
577 | vcpu->mode = IN_GUEST_MODE; | |
578 | ||
579 | ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); | |
580 | ||
581 | vcpu->mode = OUTSIDE_GUEST_MODE; | |
5b3e5e5b | 582 | vcpu->arch.last_pcpu = smp_processor_id(); |
f7ed45be CD |
583 | kvm_guest_exit(); |
584 | trace_kvm_exit(*vcpu_pc(vcpu)); | |
585 | /* | |
586 | * We may have taken a host interrupt in HYP mode (ie | |
587 | * while executing the guest). This interrupt is still | |
588 | * pending, as we haven't serviced it yet! | |
589 | * | |
590 | * We're now back in SVC mode, with interrupts | |
591 | * disabled. Enabling the interrupts now will have | |
592 | * the effect of taking the interrupt again, in SVC | |
593 | * mode this time. | |
594 | */ | |
595 | local_irq_enable(); | |
596 | ||
597 | /* | |
598 | * Back from guest | |
599 | *************************************************************/ | |
600 | ||
c7e3ba64 | 601 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 MZ |
602 | kvm_vgic_sync_hwstate(vcpu); |
603 | ||
f7ed45be CD |
604 | ret = handle_exit(vcpu, run, ret); |
605 | } | |
606 | ||
607 | if (vcpu->sigset_active) | |
608 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
609 | return ret; | |
749cf76c CD |
610 | } |
611 | ||
86ce8535 CD |
612 | static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) |
613 | { | |
614 | int bit_index; | |
615 | bool set; | |
616 | unsigned long *ptr; | |
617 | ||
618 | if (number == KVM_ARM_IRQ_CPU_IRQ) | |
619 | bit_index = __ffs(HCR_VI); | |
620 | else /* KVM_ARM_IRQ_CPU_FIQ */ | |
621 | bit_index = __ffs(HCR_VF); | |
622 | ||
623 | ptr = (unsigned long *)&vcpu->arch.irq_lines; | |
624 | if (level) | |
625 | set = test_and_set_bit(bit_index, ptr); | |
626 | else | |
627 | set = test_and_clear_bit(bit_index, ptr); | |
628 | ||
629 | /* | |
630 | * If we didn't change anything, no need to wake up or kick other CPUs | |
631 | */ | |
632 | if (set == level) | |
633 | return 0; | |
634 | ||
635 | /* | |
636 | * The vcpu irq_lines field was updated, wake up sleeping VCPUs and | |
637 | * trigger a world-switch round on the running physical CPU to set the | |
638 | * virtual IRQ/FIQ fields in the HCR appropriately. | |
639 | */ | |
640 | kvm_vcpu_kick(vcpu); | |
641 | ||
642 | return 0; | |
643 | } | |
644 | ||
79558f11 AG |
645 | int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, |
646 | bool line_status) | |
86ce8535 CD |
647 | { |
648 | u32 irq = irq_level->irq; | |
649 | unsigned int irq_type, vcpu_idx, irq_num; | |
650 | int nrcpus = atomic_read(&kvm->online_vcpus); | |
651 | struct kvm_vcpu *vcpu = NULL; | |
652 | bool level = irq_level->level; | |
653 | ||
654 | irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; | |
655 | vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; | |
656 | irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; | |
657 | ||
658 | trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); | |
659 | ||
5863c2ce MZ |
660 | switch (irq_type) { |
661 | case KVM_ARM_IRQ_TYPE_CPU: | |
662 | if (irqchip_in_kernel(kvm)) | |
663 | return -ENXIO; | |
86ce8535 | 664 | |
5863c2ce MZ |
665 | if (vcpu_idx >= nrcpus) |
666 | return -EINVAL; | |
86ce8535 | 667 | |
5863c2ce MZ |
668 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); |
669 | if (!vcpu) | |
670 | return -EINVAL; | |
86ce8535 | 671 | |
5863c2ce MZ |
672 | if (irq_num > KVM_ARM_IRQ_CPU_FIQ) |
673 | return -EINVAL; | |
674 | ||
675 | return vcpu_interrupt_line(vcpu, irq_num, level); | |
676 | case KVM_ARM_IRQ_TYPE_PPI: | |
677 | if (!irqchip_in_kernel(kvm)) | |
678 | return -ENXIO; | |
679 | ||
680 | if (vcpu_idx >= nrcpus) | |
681 | return -EINVAL; | |
682 | ||
683 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); | |
684 | if (!vcpu) | |
685 | return -EINVAL; | |
686 | ||
687 | if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) | |
688 | return -EINVAL; | |
86ce8535 | 689 | |
5863c2ce MZ |
690 | return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); |
691 | case KVM_ARM_IRQ_TYPE_SPI: | |
692 | if (!irqchip_in_kernel(kvm)) | |
693 | return -ENXIO; | |
694 | ||
695 | if (irq_num < VGIC_NR_PRIVATE_IRQS || | |
696 | irq_num > KVM_ARM_IRQ_GIC_MAX) | |
697 | return -EINVAL; | |
698 | ||
699 | return kvm_vgic_inject_irq(kvm, 0, irq_num, level); | |
700 | } | |
701 | ||
702 | return -EINVAL; | |
86ce8535 CD |
703 | } |
704 | ||
749cf76c CD |
705 | long kvm_arch_vcpu_ioctl(struct file *filp, |
706 | unsigned int ioctl, unsigned long arg) | |
707 | { | |
708 | struct kvm_vcpu *vcpu = filp->private_data; | |
709 | void __user *argp = (void __user *)arg; | |
710 | ||
711 | switch (ioctl) { | |
712 | case KVM_ARM_VCPU_INIT: { | |
713 | struct kvm_vcpu_init init; | |
714 | ||
715 | if (copy_from_user(&init, argp, sizeof(init))) | |
716 | return -EFAULT; | |
717 | ||
718 | return kvm_vcpu_set_target(vcpu, &init); | |
719 | ||
720 | } | |
721 | case KVM_SET_ONE_REG: | |
722 | case KVM_GET_ONE_REG: { | |
723 | struct kvm_one_reg reg; | |
e8180dca AP |
724 | |
725 | if (unlikely(!kvm_vcpu_initialized(vcpu))) | |
726 | return -ENOEXEC; | |
727 | ||
749cf76c CD |
728 | if (copy_from_user(®, argp, sizeof(reg))) |
729 | return -EFAULT; | |
730 | if (ioctl == KVM_SET_ONE_REG) | |
731 | return kvm_arm_set_reg(vcpu, ®); | |
732 | else | |
733 | return kvm_arm_get_reg(vcpu, ®); | |
734 | } | |
735 | case KVM_GET_REG_LIST: { | |
736 | struct kvm_reg_list __user *user_list = argp; | |
737 | struct kvm_reg_list reg_list; | |
738 | unsigned n; | |
739 | ||
e8180dca AP |
740 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
741 | return -ENOEXEC; | |
742 | ||
749cf76c CD |
743 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) |
744 | return -EFAULT; | |
745 | n = reg_list.n; | |
746 | reg_list.n = kvm_arm_num_regs(vcpu); | |
747 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) | |
748 | return -EFAULT; | |
749 | if (n < reg_list.n) | |
750 | return -E2BIG; | |
751 | return kvm_arm_copy_reg_indices(vcpu, user_list->reg); | |
752 | } | |
753 | default: | |
754 | return -EINVAL; | |
755 | } | |
756 | } | |
757 | ||
758 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) | |
759 | { | |
760 | return -EINVAL; | |
761 | } | |
762 | ||
3401d546 CD |
763 | static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, |
764 | struct kvm_arm_device_addr *dev_addr) | |
765 | { | |
330690cd CD |
766 | unsigned long dev_id, type; |
767 | ||
768 | dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> | |
769 | KVM_ARM_DEVICE_ID_SHIFT; | |
770 | type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> | |
771 | KVM_ARM_DEVICE_TYPE_SHIFT; | |
772 | ||
773 | switch (dev_id) { | |
774 | case KVM_ARM_DEVICE_VGIC_V2: | |
775 | if (!vgic_present) | |
776 | return -ENXIO; | |
777 | return kvm_vgic_set_addr(kvm, type, dev_addr->addr); | |
778 | default: | |
779 | return -ENODEV; | |
780 | } | |
3401d546 CD |
781 | } |
782 | ||
749cf76c CD |
783 | long kvm_arch_vm_ioctl(struct file *filp, |
784 | unsigned int ioctl, unsigned long arg) | |
785 | { | |
3401d546 CD |
786 | struct kvm *kvm = filp->private_data; |
787 | void __user *argp = (void __user *)arg; | |
788 | ||
789 | switch (ioctl) { | |
5863c2ce MZ |
790 | case KVM_CREATE_IRQCHIP: { |
791 | if (vgic_present) | |
792 | return kvm_vgic_create(kvm); | |
793 | else | |
794 | return -ENXIO; | |
795 | } | |
3401d546 CD |
796 | case KVM_ARM_SET_DEVICE_ADDR: { |
797 | struct kvm_arm_device_addr dev_addr; | |
798 | ||
799 | if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) | |
800 | return -EFAULT; | |
801 | return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); | |
802 | } | |
42c4e0c7 AP |
803 | case KVM_ARM_PREFERRED_TARGET: { |
804 | int err; | |
805 | struct kvm_vcpu_init init; | |
806 | ||
807 | err = kvm_vcpu_preferred_target(&init); | |
808 | if (err) | |
809 | return err; | |
810 | ||
811 | if (copy_to_user(argp, &init, sizeof(init))) | |
812 | return -EFAULT; | |
813 | ||
814 | return 0; | |
815 | } | |
3401d546 CD |
816 | default: |
817 | return -EINVAL; | |
818 | } | |
749cf76c CD |
819 | } |
820 | ||
d157f4a5 | 821 | static void cpu_init_hyp_mode(void *dummy) |
342cd0ab | 822 | { |
dac288f7 MZ |
823 | phys_addr_t boot_pgd_ptr; |
824 | phys_addr_t pgd_ptr; | |
342cd0ab CD |
825 | unsigned long hyp_stack_ptr; |
826 | unsigned long stack_page; | |
827 | unsigned long vector_ptr; | |
828 | ||
829 | /* Switch from the HYP stub to our own HYP init vector */ | |
5a677ce0 | 830 | __hyp_set_vectors(kvm_get_idmap_vector()); |
342cd0ab | 831 | |
dac288f7 MZ |
832 | boot_pgd_ptr = kvm_mmu_get_boot_httbr(); |
833 | pgd_ptr = kvm_mmu_get_httbr(); | |
1436c1aa | 834 | stack_page = __this_cpu_read(kvm_arm_hyp_stack_page); |
342cd0ab CD |
835 | hyp_stack_ptr = stack_page + PAGE_SIZE; |
836 | vector_ptr = (unsigned long)__kvm_hyp_vector; | |
837 | ||
5a677ce0 | 838 | __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr); |
342cd0ab CD |
839 | } |
840 | ||
d157f4a5 MZ |
841 | static int hyp_init_cpu_notify(struct notifier_block *self, |
842 | unsigned long action, void *cpu) | |
843 | { | |
844 | switch (action) { | |
845 | case CPU_STARTING: | |
846 | case CPU_STARTING_FROZEN: | |
847 | cpu_init_hyp_mode(NULL); | |
848 | break; | |
849 | } | |
850 | ||
851 | return NOTIFY_OK; | |
342cd0ab CD |
852 | } |
853 | ||
d157f4a5 MZ |
854 | static struct notifier_block hyp_init_cpu_nb = { |
855 | .notifier_call = hyp_init_cpu_notify, | |
856 | }; | |
857 | ||
342cd0ab CD |
858 | /** |
859 | * Inits Hyp-mode on all online CPUs | |
860 | */ | |
861 | static int init_hyp_mode(void) | |
862 | { | |
342cd0ab CD |
863 | int cpu; |
864 | int err = 0; | |
865 | ||
866 | /* | |
867 | * Allocate Hyp PGD and setup Hyp identity mapping | |
868 | */ | |
869 | err = kvm_mmu_init(); | |
870 | if (err) | |
871 | goto out_err; | |
872 | ||
873 | /* | |
874 | * It is probably enough to obtain the default on one | |
875 | * CPU. It's unlikely to be different on the others. | |
876 | */ | |
877 | hyp_default_vectors = __hyp_get_vectors(); | |
878 | ||
879 | /* | |
880 | * Allocate stack pages for Hypervisor-mode | |
881 | */ | |
882 | for_each_possible_cpu(cpu) { | |
883 | unsigned long stack_page; | |
884 | ||
885 | stack_page = __get_free_page(GFP_KERNEL); | |
886 | if (!stack_page) { | |
887 | err = -ENOMEM; | |
888 | goto out_free_stack_pages; | |
889 | } | |
890 | ||
891 | per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; | |
892 | } | |
893 | ||
342cd0ab CD |
894 | /* |
895 | * Map the Hyp-code called directly from the host | |
896 | */ | |
897 | err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end); | |
898 | if (err) { | |
899 | kvm_err("Cannot map world-switch code\n"); | |
900 | goto out_free_mappings; | |
901 | } | |
902 | ||
903 | /* | |
904 | * Map the Hyp stack pages | |
905 | */ | |
906 | for_each_possible_cpu(cpu) { | |
907 | char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); | |
908 | err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE); | |
909 | ||
910 | if (err) { | |
911 | kvm_err("Cannot map hyp stack\n"); | |
912 | goto out_free_mappings; | |
913 | } | |
914 | } | |
915 | ||
916 | /* | |
3de50da6 | 917 | * Map the host CPU structures |
342cd0ab | 918 | */ |
3de50da6 MZ |
919 | kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t); |
920 | if (!kvm_host_cpu_state) { | |
342cd0ab | 921 | err = -ENOMEM; |
3de50da6 | 922 | kvm_err("Cannot allocate host CPU state\n"); |
342cd0ab CD |
923 | goto out_free_mappings; |
924 | } | |
925 | ||
926 | for_each_possible_cpu(cpu) { | |
3de50da6 | 927 | kvm_cpu_context_t *cpu_ctxt; |
342cd0ab | 928 | |
3de50da6 MZ |
929 | cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu); |
930 | err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1); | |
342cd0ab CD |
931 | |
932 | if (err) { | |
3de50da6 MZ |
933 | kvm_err("Cannot map host CPU state: %d\n", err); |
934 | goto out_free_context; | |
342cd0ab CD |
935 | } |
936 | } | |
937 | ||
d157f4a5 MZ |
938 | /* |
939 | * Execute the init code on each CPU. | |
940 | */ | |
941 | on_each_cpu(cpu_init_hyp_mode, NULL, 1); | |
942 | ||
1a89dd91 MZ |
943 | /* |
944 | * Init HYP view of VGIC | |
945 | */ | |
946 | err = kvm_vgic_hyp_init(); | |
947 | if (err) | |
3de50da6 | 948 | goto out_free_context; |
1a89dd91 | 949 | |
01ac5e34 MZ |
950 | #ifdef CONFIG_KVM_ARM_VGIC |
951 | vgic_present = true; | |
952 | #endif | |
953 | ||
967f8427 MZ |
954 | /* |
955 | * Init HYP architected timer support | |
956 | */ | |
957 | err = kvm_timer_hyp_init(); | |
958 | if (err) | |
959 | goto out_free_mappings; | |
960 | ||
d157f4a5 MZ |
961 | #ifndef CONFIG_HOTPLUG_CPU |
962 | free_boot_hyp_pgd(); | |
963 | #endif | |
964 | ||
210552c1 MZ |
965 | kvm_perf_init(); |
966 | ||
342cd0ab | 967 | kvm_info("Hyp mode initialized successfully\n"); |
210552c1 | 968 | |
342cd0ab | 969 | return 0; |
3de50da6 MZ |
970 | out_free_context: |
971 | free_percpu(kvm_host_cpu_state); | |
342cd0ab | 972 | out_free_mappings: |
4f728276 | 973 | free_hyp_pgds(); |
342cd0ab CD |
974 | out_free_stack_pages: |
975 | for_each_possible_cpu(cpu) | |
976 | free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); | |
977 | out_err: | |
978 | kvm_err("error initializing Hyp mode: %d\n", err); | |
979 | return err; | |
980 | } | |
981 | ||
d4e071ce AP |
982 | static void check_kvm_target_cpu(void *ret) |
983 | { | |
984 | *(int *)ret = kvm_target_cpu(); | |
985 | } | |
986 | ||
342cd0ab CD |
987 | /** |
988 | * Initialize Hyp-mode and memory mappings on all CPUs. | |
989 | */ | |
749cf76c CD |
990 | int kvm_arch_init(void *opaque) |
991 | { | |
342cd0ab | 992 | int err; |
d4e071ce | 993 | int ret, cpu; |
342cd0ab CD |
994 | |
995 | if (!is_hyp_mode_available()) { | |
996 | kvm_err("HYP mode not available\n"); | |
997 | return -ENODEV; | |
998 | } | |
999 | ||
d4e071ce AP |
1000 | for_each_online_cpu(cpu) { |
1001 | smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1); | |
1002 | if (ret < 0) { | |
1003 | kvm_err("Error, CPU %d not supported!\n", cpu); | |
1004 | return -ENODEV; | |
1005 | } | |
342cd0ab CD |
1006 | } |
1007 | ||
1008 | err = init_hyp_mode(); | |
1009 | if (err) | |
1010 | goto out_err; | |
1011 | ||
d157f4a5 MZ |
1012 | err = register_cpu_notifier(&hyp_init_cpu_nb); |
1013 | if (err) { | |
1014 | kvm_err("Cannot register HYP init CPU notifier (%d)\n", err); | |
1015 | goto out_err; | |
1016 | } | |
1017 | ||
5b3e5e5b | 1018 | kvm_coproc_table_init(); |
749cf76c | 1019 | return 0; |
342cd0ab CD |
1020 | out_err: |
1021 | return err; | |
749cf76c CD |
1022 | } |
1023 | ||
1024 | /* NOP: Compiling as a module not supported */ | |
1025 | void kvm_arch_exit(void) | |
1026 | { | |
210552c1 | 1027 | kvm_perf_teardown(); |
749cf76c CD |
1028 | } |
1029 | ||
1030 | static int arm_init(void) | |
1031 | { | |
1032 | int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); | |
1033 | return rc; | |
1034 | } | |
1035 | ||
1036 | module_init(arm_init); |