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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 | ||
a1a64387 CD |
141 | kvm_timer_init(kvm); |
142 | ||
d5d8184d CD |
143 | /* Mark the initial VMID generation invalid */ |
144 | kvm->arch.vmid_gen = 0; | |
145 | ||
146 | return ret; | |
147 | out_free_stage2_pgd: | |
148 | kvm_free_stage2_pgd(kvm); | |
149 | out_fail_alloc: | |
150 | return ret; | |
749cf76c CD |
151 | } |
152 | ||
153 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
154 | { | |
155 | return VM_FAULT_SIGBUS; | |
156 | } | |
157 | ||
5587027c | 158 | void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, |
749cf76c CD |
159 | struct kvm_memory_slot *dont) |
160 | { | |
161 | } | |
162 | ||
5587027c AK |
163 | int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, |
164 | unsigned long npages) | |
749cf76c CD |
165 | { |
166 | return 0; | |
167 | } | |
168 | ||
d5d8184d CD |
169 | /** |
170 | * kvm_arch_destroy_vm - destroy the VM data structure | |
171 | * @kvm: pointer to the KVM struct | |
172 | */ | |
749cf76c CD |
173 | void kvm_arch_destroy_vm(struct kvm *kvm) |
174 | { | |
175 | int i; | |
176 | ||
d5d8184d CD |
177 | kvm_free_stage2_pgd(kvm); |
178 | ||
749cf76c CD |
179 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
180 | if (kvm->vcpus[i]) { | |
181 | kvm_arch_vcpu_free(kvm->vcpus[i]); | |
182 | kvm->vcpus[i] = NULL; | |
183 | } | |
184 | } | |
185 | } | |
186 | ||
187 | int kvm_dev_ioctl_check_extension(long ext) | |
188 | { | |
189 | int r; | |
190 | switch (ext) { | |
1a89dd91 MZ |
191 | case KVM_CAP_IRQCHIP: |
192 | r = vgic_present; | |
193 | break; | |
7330672b | 194 | case KVM_CAP_DEVICE_CTRL: |
749cf76c CD |
195 | case KVM_CAP_USER_MEMORY: |
196 | case KVM_CAP_SYNC_MMU: | |
197 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
198 | case KVM_CAP_ONE_REG: | |
aa024c2f | 199 | case KVM_CAP_ARM_PSCI: |
749cf76c CD |
200 | r = 1; |
201 | break; | |
202 | case KVM_CAP_COALESCED_MMIO: | |
203 | r = KVM_COALESCED_MMIO_PAGE_OFFSET; | |
204 | break; | |
3401d546 CD |
205 | case KVM_CAP_ARM_SET_DEVICE_ADDR: |
206 | r = 1; | |
ca46e10f | 207 | break; |
749cf76c CD |
208 | case KVM_CAP_NR_VCPUS: |
209 | r = num_online_cpus(); | |
210 | break; | |
211 | case KVM_CAP_MAX_VCPUS: | |
212 | r = KVM_MAX_VCPUS; | |
213 | break; | |
214 | default: | |
17b1e31f | 215 | r = kvm_arch_dev_ioctl_check_extension(ext); |
749cf76c CD |
216 | break; |
217 | } | |
218 | return r; | |
219 | } | |
220 | ||
221 | long kvm_arch_dev_ioctl(struct file *filp, | |
222 | unsigned int ioctl, unsigned long arg) | |
223 | { | |
224 | return -EINVAL; | |
225 | } | |
226 | ||
e59dbe09 TY |
227 | void kvm_arch_memslots_updated(struct kvm *kvm) |
228 | { | |
229 | } | |
230 | ||
749cf76c CD |
231 | int kvm_arch_prepare_memory_region(struct kvm *kvm, |
232 | struct kvm_memory_slot *memslot, | |
749cf76c | 233 | struct kvm_userspace_memory_region *mem, |
7b6195a9 | 234 | enum kvm_mr_change change) |
749cf76c CD |
235 | { |
236 | return 0; | |
237 | } | |
238 | ||
239 | void kvm_arch_commit_memory_region(struct kvm *kvm, | |
240 | struct kvm_userspace_memory_region *mem, | |
8482644a TY |
241 | const struct kvm_memory_slot *old, |
242 | enum kvm_mr_change change) | |
749cf76c CD |
243 | { |
244 | } | |
245 | ||
246 | void kvm_arch_flush_shadow_all(struct kvm *kvm) | |
247 | { | |
248 | } | |
249 | ||
250 | void kvm_arch_flush_shadow_memslot(struct kvm *kvm, | |
251 | struct kvm_memory_slot *slot) | |
252 | { | |
253 | } | |
254 | ||
255 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) | |
256 | { | |
257 | int err; | |
258 | struct kvm_vcpu *vcpu; | |
259 | ||
260 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
261 | if (!vcpu) { | |
262 | err = -ENOMEM; | |
263 | goto out; | |
264 | } | |
265 | ||
266 | err = kvm_vcpu_init(vcpu, kvm, id); | |
267 | if (err) | |
268 | goto free_vcpu; | |
269 | ||
d5d8184d CD |
270 | err = create_hyp_mappings(vcpu, vcpu + 1); |
271 | if (err) | |
272 | goto vcpu_uninit; | |
273 | ||
749cf76c | 274 | return vcpu; |
d5d8184d CD |
275 | vcpu_uninit: |
276 | kvm_vcpu_uninit(vcpu); | |
749cf76c CD |
277 | free_vcpu: |
278 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
279 | out: | |
280 | return ERR_PTR(err); | |
281 | } | |
282 | ||
283 | int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) | |
284 | { | |
285 | return 0; | |
286 | } | |
287 | ||
288 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
289 | { | |
d5d8184d | 290 | kvm_mmu_free_memory_caches(vcpu); |
967f8427 | 291 | kvm_timer_vcpu_terminate(vcpu); |
d5d8184d | 292 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
749cf76c CD |
293 | } |
294 | ||
295 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
296 | { | |
297 | kvm_arch_vcpu_free(vcpu); | |
298 | } | |
299 | ||
300 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
301 | { | |
302 | return 0; | |
303 | } | |
304 | ||
749cf76c CD |
305 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) |
306 | { | |
1a89dd91 MZ |
307 | int ret; |
308 | ||
f7ed45be CD |
309 | /* Force users to call KVM_ARM_VCPU_INIT */ |
310 | vcpu->arch.target = -1; | |
1a89dd91 MZ |
311 | |
312 | /* Set up VGIC */ | |
313 | ret = kvm_vgic_vcpu_init(vcpu); | |
314 | if (ret) | |
315 | return ret; | |
316 | ||
967f8427 MZ |
317 | /* Set up the timer */ |
318 | kvm_timer_vcpu_init(vcpu); | |
319 | ||
749cf76c CD |
320 | return 0; |
321 | } | |
322 | ||
323 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) | |
324 | { | |
325 | } | |
326 | ||
327 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
328 | { | |
86ce8535 | 329 | vcpu->cpu = cpu; |
3de50da6 | 330 | vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state); |
5b3e5e5b CD |
331 | |
332 | /* | |
333 | * Check whether this vcpu requires the cache to be flushed on | |
334 | * this physical CPU. This is a consequence of doing dcache | |
335 | * operations by set/way on this vcpu. We do it here to be in | |
336 | * a non-preemptible section. | |
337 | */ | |
338 | if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush)) | |
339 | flush_cache_all(); /* We'd really want v7_flush_dcache_all() */ | |
1638a12d MZ |
340 | |
341 | kvm_arm_set_running_vcpu(vcpu); | |
749cf76c CD |
342 | } |
343 | ||
344 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
345 | { | |
e9b152cb CD |
346 | /* |
347 | * The arch-generic KVM code expects the cpu field of a vcpu to be -1 | |
348 | * if the vcpu is no longer assigned to a cpu. This is used for the | |
349 | * optimized make_all_cpus_request path. | |
350 | */ | |
351 | vcpu->cpu = -1; | |
352 | ||
1638a12d | 353 | kvm_arm_set_running_vcpu(NULL); |
749cf76c CD |
354 | } |
355 | ||
356 | int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, | |
357 | struct kvm_guest_debug *dbg) | |
358 | { | |
359 | return -EINVAL; | |
360 | } | |
361 | ||
362 | ||
363 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, | |
364 | struct kvm_mp_state *mp_state) | |
365 | { | |
366 | return -EINVAL; | |
367 | } | |
368 | ||
369 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
370 | struct kvm_mp_state *mp_state) | |
371 | { | |
372 | return -EINVAL; | |
373 | } | |
374 | ||
5b3e5e5b CD |
375 | /** |
376 | * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled | |
377 | * @v: The VCPU pointer | |
378 | * | |
379 | * If the guest CPU is not waiting for interrupts or an interrupt line is | |
380 | * asserted, the CPU is by definition runnable. | |
381 | */ | |
749cf76c CD |
382 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) |
383 | { | |
1a89dd91 | 384 | return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v); |
749cf76c CD |
385 | } |
386 | ||
f7ed45be CD |
387 | /* Just ensure a guest exit from a particular CPU */ |
388 | static void exit_vm_noop(void *info) | |
389 | { | |
390 | } | |
391 | ||
392 | void force_vm_exit(const cpumask_t *mask) | |
393 | { | |
394 | smp_call_function_many(mask, exit_vm_noop, NULL, true); | |
395 | } | |
396 | ||
397 | /** | |
398 | * need_new_vmid_gen - check that the VMID is still valid | |
399 | * @kvm: The VM's VMID to checkt | |
400 | * | |
401 | * return true if there is a new generation of VMIDs being used | |
402 | * | |
403 | * The hardware supports only 256 values with the value zero reserved for the | |
404 | * host, so we check if an assigned value belongs to a previous generation, | |
405 | * which which requires us to assign a new value. If we're the first to use a | |
406 | * VMID for the new generation, we must flush necessary caches and TLBs on all | |
407 | * CPUs. | |
408 | */ | |
409 | static bool need_new_vmid_gen(struct kvm *kvm) | |
410 | { | |
411 | return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); | |
412 | } | |
413 | ||
414 | /** | |
415 | * update_vttbr - Update the VTTBR with a valid VMID before the guest runs | |
416 | * @kvm The guest that we are about to run | |
417 | * | |
418 | * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the | |
419 | * VM has a valid VMID, otherwise assigns a new one and flushes corresponding | |
420 | * caches and TLBs. | |
421 | */ | |
422 | static void update_vttbr(struct kvm *kvm) | |
423 | { | |
424 | phys_addr_t pgd_phys; | |
425 | u64 vmid; | |
426 | ||
427 | if (!need_new_vmid_gen(kvm)) | |
428 | return; | |
429 | ||
430 | spin_lock(&kvm_vmid_lock); | |
431 | ||
432 | /* | |
433 | * We need to re-check the vmid_gen here to ensure that if another vcpu | |
434 | * already allocated a valid vmid for this vm, then this vcpu should | |
435 | * use the same vmid. | |
436 | */ | |
437 | if (!need_new_vmid_gen(kvm)) { | |
438 | spin_unlock(&kvm_vmid_lock); | |
439 | return; | |
440 | } | |
441 | ||
442 | /* First user of a new VMID generation? */ | |
443 | if (unlikely(kvm_next_vmid == 0)) { | |
444 | atomic64_inc(&kvm_vmid_gen); | |
445 | kvm_next_vmid = 1; | |
446 | ||
447 | /* | |
448 | * On SMP we know no other CPUs can use this CPU's or each | |
449 | * other's VMID after force_vm_exit returns since the | |
450 | * kvm_vmid_lock blocks them from reentry to the guest. | |
451 | */ | |
452 | force_vm_exit(cpu_all_mask); | |
453 | /* | |
454 | * Now broadcast TLB + ICACHE invalidation over the inner | |
455 | * shareable domain to make sure all data structures are | |
456 | * clean. | |
457 | */ | |
458 | kvm_call_hyp(__kvm_flush_vm_context); | |
459 | } | |
460 | ||
461 | kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); | |
462 | kvm->arch.vmid = kvm_next_vmid; | |
463 | kvm_next_vmid++; | |
464 | ||
465 | /* update vttbr to be used with the new vmid */ | |
466 | pgd_phys = virt_to_phys(kvm->arch.pgd); | |
467 | vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK; | |
468 | kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK; | |
469 | kvm->arch.vttbr |= vmid; | |
470 | ||
471 | spin_unlock(&kvm_vmid_lock); | |
472 | } | |
473 | ||
f7ed45be CD |
474 | static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) |
475 | { | |
e1ba0207 CD |
476 | int ret; |
477 | ||
f7ed45be CD |
478 | if (likely(vcpu->arch.has_run_once)) |
479 | return 0; | |
480 | ||
481 | vcpu->arch.has_run_once = true; | |
aa024c2f | 482 | |
01ac5e34 MZ |
483 | /* |
484 | * Initialize the VGIC before running a vcpu the first time on | |
485 | * this VM. | |
486 | */ | |
e1ba0207 CD |
487 | if (unlikely(!vgic_initialized(vcpu->kvm))) { |
488 | ret = kvm_vgic_init(vcpu->kvm); | |
01ac5e34 MZ |
489 | if (ret) |
490 | return ret; | |
491 | } | |
492 | ||
f7ed45be CD |
493 | return 0; |
494 | } | |
495 | ||
aa024c2f MZ |
496 | static void vcpu_pause(struct kvm_vcpu *vcpu) |
497 | { | |
498 | wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); | |
499 | ||
500 | wait_event_interruptible(*wq, !vcpu->arch.pause); | |
501 | } | |
502 | ||
e8180dca AP |
503 | static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) |
504 | { | |
505 | return vcpu->arch.target >= 0; | |
506 | } | |
507 | ||
f7ed45be CD |
508 | /** |
509 | * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code | |
510 | * @vcpu: The VCPU pointer | |
511 | * @run: The kvm_run structure pointer used for userspace state exchange | |
512 | * | |
513 | * This function is called through the VCPU_RUN ioctl called from user space. It | |
514 | * will execute VM code in a loop until the time slice for the process is used | |
515 | * or some emulation is needed from user space in which case the function will | |
516 | * return with return value 0 and with the kvm_run structure filled in with the | |
517 | * required data for the requested emulation. | |
518 | */ | |
749cf76c CD |
519 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) |
520 | { | |
f7ed45be CD |
521 | int ret; |
522 | sigset_t sigsaved; | |
523 | ||
e8180dca | 524 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
f7ed45be CD |
525 | return -ENOEXEC; |
526 | ||
527 | ret = kvm_vcpu_first_run_init(vcpu); | |
528 | if (ret) | |
529 | return ret; | |
530 | ||
45e96ea6 CD |
531 | if (run->exit_reason == KVM_EXIT_MMIO) { |
532 | ret = kvm_handle_mmio_return(vcpu, vcpu->run); | |
533 | if (ret) | |
534 | return ret; | |
535 | } | |
536 | ||
f7ed45be CD |
537 | if (vcpu->sigset_active) |
538 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
539 | ||
540 | ret = 1; | |
541 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
542 | while (ret > 0) { | |
543 | /* | |
544 | * Check conditions before entering the guest | |
545 | */ | |
546 | cond_resched(); | |
547 | ||
548 | update_vttbr(vcpu->kvm); | |
549 | ||
aa024c2f MZ |
550 | if (vcpu->arch.pause) |
551 | vcpu_pause(vcpu); | |
552 | ||
1a89dd91 | 553 | kvm_vgic_flush_hwstate(vcpu); |
c7e3ba64 | 554 | kvm_timer_flush_hwstate(vcpu); |
1a89dd91 | 555 | |
f7ed45be CD |
556 | local_irq_disable(); |
557 | ||
558 | /* | |
559 | * Re-check atomic conditions | |
560 | */ | |
561 | if (signal_pending(current)) { | |
562 | ret = -EINTR; | |
563 | run->exit_reason = KVM_EXIT_INTR; | |
564 | } | |
565 | ||
566 | if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) { | |
567 | local_irq_enable(); | |
c7e3ba64 | 568 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 | 569 | kvm_vgic_sync_hwstate(vcpu); |
f7ed45be CD |
570 | continue; |
571 | } | |
572 | ||
573 | /************************************************************** | |
574 | * Enter the guest | |
575 | */ | |
576 | trace_kvm_entry(*vcpu_pc(vcpu)); | |
577 | kvm_guest_enter(); | |
578 | vcpu->mode = IN_GUEST_MODE; | |
579 | ||
580 | ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); | |
581 | ||
582 | vcpu->mode = OUTSIDE_GUEST_MODE; | |
5b3e5e5b | 583 | vcpu->arch.last_pcpu = smp_processor_id(); |
f7ed45be CD |
584 | kvm_guest_exit(); |
585 | trace_kvm_exit(*vcpu_pc(vcpu)); | |
586 | /* | |
587 | * We may have taken a host interrupt in HYP mode (ie | |
588 | * while executing the guest). This interrupt is still | |
589 | * pending, as we haven't serviced it yet! | |
590 | * | |
591 | * We're now back in SVC mode, with interrupts | |
592 | * disabled. Enabling the interrupts now will have | |
593 | * the effect of taking the interrupt again, in SVC | |
594 | * mode this time. | |
595 | */ | |
596 | local_irq_enable(); | |
597 | ||
598 | /* | |
599 | * Back from guest | |
600 | *************************************************************/ | |
601 | ||
c7e3ba64 | 602 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 MZ |
603 | kvm_vgic_sync_hwstate(vcpu); |
604 | ||
f7ed45be CD |
605 | ret = handle_exit(vcpu, run, ret); |
606 | } | |
607 | ||
608 | if (vcpu->sigset_active) | |
609 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
610 | return ret; | |
749cf76c CD |
611 | } |
612 | ||
86ce8535 CD |
613 | static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) |
614 | { | |
615 | int bit_index; | |
616 | bool set; | |
617 | unsigned long *ptr; | |
618 | ||
619 | if (number == KVM_ARM_IRQ_CPU_IRQ) | |
620 | bit_index = __ffs(HCR_VI); | |
621 | else /* KVM_ARM_IRQ_CPU_FIQ */ | |
622 | bit_index = __ffs(HCR_VF); | |
623 | ||
624 | ptr = (unsigned long *)&vcpu->arch.irq_lines; | |
625 | if (level) | |
626 | set = test_and_set_bit(bit_index, ptr); | |
627 | else | |
628 | set = test_and_clear_bit(bit_index, ptr); | |
629 | ||
630 | /* | |
631 | * If we didn't change anything, no need to wake up or kick other CPUs | |
632 | */ | |
633 | if (set == level) | |
634 | return 0; | |
635 | ||
636 | /* | |
637 | * The vcpu irq_lines field was updated, wake up sleeping VCPUs and | |
638 | * trigger a world-switch round on the running physical CPU to set the | |
639 | * virtual IRQ/FIQ fields in the HCR appropriately. | |
640 | */ | |
641 | kvm_vcpu_kick(vcpu); | |
642 | ||
643 | return 0; | |
644 | } | |
645 | ||
79558f11 AG |
646 | int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, |
647 | bool line_status) | |
86ce8535 CD |
648 | { |
649 | u32 irq = irq_level->irq; | |
650 | unsigned int irq_type, vcpu_idx, irq_num; | |
651 | int nrcpus = atomic_read(&kvm->online_vcpus); | |
652 | struct kvm_vcpu *vcpu = NULL; | |
653 | bool level = irq_level->level; | |
654 | ||
655 | irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; | |
656 | vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; | |
657 | irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; | |
658 | ||
659 | trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); | |
660 | ||
5863c2ce MZ |
661 | switch (irq_type) { |
662 | case KVM_ARM_IRQ_TYPE_CPU: | |
663 | if (irqchip_in_kernel(kvm)) | |
664 | return -ENXIO; | |
86ce8535 | 665 | |
5863c2ce MZ |
666 | if (vcpu_idx >= nrcpus) |
667 | return -EINVAL; | |
86ce8535 | 668 | |
5863c2ce MZ |
669 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); |
670 | if (!vcpu) | |
671 | return -EINVAL; | |
86ce8535 | 672 | |
5863c2ce MZ |
673 | if (irq_num > KVM_ARM_IRQ_CPU_FIQ) |
674 | return -EINVAL; | |
675 | ||
676 | return vcpu_interrupt_line(vcpu, irq_num, level); | |
677 | case KVM_ARM_IRQ_TYPE_PPI: | |
678 | if (!irqchip_in_kernel(kvm)) | |
679 | return -ENXIO; | |
680 | ||
681 | if (vcpu_idx >= nrcpus) | |
682 | return -EINVAL; | |
683 | ||
684 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); | |
685 | if (!vcpu) | |
686 | return -EINVAL; | |
687 | ||
688 | if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) | |
689 | return -EINVAL; | |
86ce8535 | 690 | |
5863c2ce MZ |
691 | return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); |
692 | case KVM_ARM_IRQ_TYPE_SPI: | |
693 | if (!irqchip_in_kernel(kvm)) | |
694 | return -ENXIO; | |
695 | ||
696 | if (irq_num < VGIC_NR_PRIVATE_IRQS || | |
697 | irq_num > KVM_ARM_IRQ_GIC_MAX) | |
698 | return -EINVAL; | |
699 | ||
700 | return kvm_vgic_inject_irq(kvm, 0, irq_num, level); | |
701 | } | |
702 | ||
703 | return -EINVAL; | |
86ce8535 CD |
704 | } |
705 | ||
478a8237 CD |
706 | static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, |
707 | struct kvm_vcpu_init *init) | |
708 | { | |
709 | int ret; | |
710 | ||
711 | ret = kvm_vcpu_set_target(vcpu, init); | |
712 | if (ret) | |
713 | return ret; | |
714 | ||
715 | /* | |
716 | * Handle the "start in power-off" case by marking the VCPU as paused. | |
717 | */ | |
718 | if (__test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) | |
719 | vcpu->arch.pause = true; | |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
749cf76c CD |
724 | long kvm_arch_vcpu_ioctl(struct file *filp, |
725 | unsigned int ioctl, unsigned long arg) | |
726 | { | |
727 | struct kvm_vcpu *vcpu = filp->private_data; | |
728 | void __user *argp = (void __user *)arg; | |
729 | ||
730 | switch (ioctl) { | |
731 | case KVM_ARM_VCPU_INIT: { | |
732 | struct kvm_vcpu_init init; | |
733 | ||
734 | if (copy_from_user(&init, argp, sizeof(init))) | |
735 | return -EFAULT; | |
736 | ||
478a8237 | 737 | return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); |
749cf76c CD |
738 | } |
739 | case KVM_SET_ONE_REG: | |
740 | case KVM_GET_ONE_REG: { | |
741 | struct kvm_one_reg reg; | |
e8180dca AP |
742 | |
743 | if (unlikely(!kvm_vcpu_initialized(vcpu))) | |
744 | return -ENOEXEC; | |
745 | ||
749cf76c CD |
746 | if (copy_from_user(®, argp, sizeof(reg))) |
747 | return -EFAULT; | |
748 | if (ioctl == KVM_SET_ONE_REG) | |
749 | return kvm_arm_set_reg(vcpu, ®); | |
750 | else | |
751 | return kvm_arm_get_reg(vcpu, ®); | |
752 | } | |
753 | case KVM_GET_REG_LIST: { | |
754 | struct kvm_reg_list __user *user_list = argp; | |
755 | struct kvm_reg_list reg_list; | |
756 | unsigned n; | |
757 | ||
e8180dca AP |
758 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
759 | return -ENOEXEC; | |
760 | ||
749cf76c CD |
761 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) |
762 | return -EFAULT; | |
763 | n = reg_list.n; | |
764 | reg_list.n = kvm_arm_num_regs(vcpu); | |
765 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) | |
766 | return -EFAULT; | |
767 | if (n < reg_list.n) | |
768 | return -E2BIG; | |
769 | return kvm_arm_copy_reg_indices(vcpu, user_list->reg); | |
770 | } | |
771 | default: | |
772 | return -EINVAL; | |
773 | } | |
774 | } | |
775 | ||
776 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) | |
777 | { | |
778 | return -EINVAL; | |
779 | } | |
780 | ||
3401d546 CD |
781 | static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, |
782 | struct kvm_arm_device_addr *dev_addr) | |
783 | { | |
330690cd CD |
784 | unsigned long dev_id, type; |
785 | ||
786 | dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> | |
787 | KVM_ARM_DEVICE_ID_SHIFT; | |
788 | type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> | |
789 | KVM_ARM_DEVICE_TYPE_SHIFT; | |
790 | ||
791 | switch (dev_id) { | |
792 | case KVM_ARM_DEVICE_VGIC_V2: | |
793 | if (!vgic_present) | |
794 | return -ENXIO; | |
ce01e4e8 | 795 | return kvm_vgic_addr(kvm, type, &dev_addr->addr, true); |
330690cd CD |
796 | default: |
797 | return -ENODEV; | |
798 | } | |
3401d546 CD |
799 | } |
800 | ||
749cf76c CD |
801 | long kvm_arch_vm_ioctl(struct file *filp, |
802 | unsigned int ioctl, unsigned long arg) | |
803 | { | |
3401d546 CD |
804 | struct kvm *kvm = filp->private_data; |
805 | void __user *argp = (void __user *)arg; | |
806 | ||
807 | switch (ioctl) { | |
5863c2ce MZ |
808 | case KVM_CREATE_IRQCHIP: { |
809 | if (vgic_present) | |
810 | return kvm_vgic_create(kvm); | |
811 | else | |
812 | return -ENXIO; | |
813 | } | |
3401d546 CD |
814 | case KVM_ARM_SET_DEVICE_ADDR: { |
815 | struct kvm_arm_device_addr dev_addr; | |
816 | ||
817 | if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) | |
818 | return -EFAULT; | |
819 | return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); | |
820 | } | |
42c4e0c7 AP |
821 | case KVM_ARM_PREFERRED_TARGET: { |
822 | int err; | |
823 | struct kvm_vcpu_init init; | |
824 | ||
825 | err = kvm_vcpu_preferred_target(&init); | |
826 | if (err) | |
827 | return err; | |
828 | ||
829 | if (copy_to_user(argp, &init, sizeof(init))) | |
830 | return -EFAULT; | |
831 | ||
832 | return 0; | |
833 | } | |
3401d546 CD |
834 | default: |
835 | return -EINVAL; | |
836 | } | |
749cf76c CD |
837 | } |
838 | ||
d157f4a5 | 839 | static void cpu_init_hyp_mode(void *dummy) |
342cd0ab | 840 | { |
dac288f7 MZ |
841 | phys_addr_t boot_pgd_ptr; |
842 | phys_addr_t pgd_ptr; | |
342cd0ab CD |
843 | unsigned long hyp_stack_ptr; |
844 | unsigned long stack_page; | |
845 | unsigned long vector_ptr; | |
846 | ||
847 | /* Switch from the HYP stub to our own HYP init vector */ | |
5a677ce0 | 848 | __hyp_set_vectors(kvm_get_idmap_vector()); |
342cd0ab | 849 | |
dac288f7 MZ |
850 | boot_pgd_ptr = kvm_mmu_get_boot_httbr(); |
851 | pgd_ptr = kvm_mmu_get_httbr(); | |
1436c1aa | 852 | stack_page = __this_cpu_read(kvm_arm_hyp_stack_page); |
342cd0ab CD |
853 | hyp_stack_ptr = stack_page + PAGE_SIZE; |
854 | vector_ptr = (unsigned long)__kvm_hyp_vector; | |
855 | ||
5a677ce0 | 856 | __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr); |
342cd0ab CD |
857 | } |
858 | ||
d157f4a5 MZ |
859 | static int hyp_init_cpu_notify(struct notifier_block *self, |
860 | unsigned long action, void *cpu) | |
861 | { | |
862 | switch (action) { | |
863 | case CPU_STARTING: | |
864 | case CPU_STARTING_FROZEN: | |
865 | cpu_init_hyp_mode(NULL); | |
866 | break; | |
867 | } | |
868 | ||
869 | return NOTIFY_OK; | |
342cd0ab CD |
870 | } |
871 | ||
d157f4a5 MZ |
872 | static struct notifier_block hyp_init_cpu_nb = { |
873 | .notifier_call = hyp_init_cpu_notify, | |
874 | }; | |
875 | ||
1fcf7ce0 LP |
876 | #ifdef CONFIG_CPU_PM |
877 | static int hyp_init_cpu_pm_notifier(struct notifier_block *self, | |
878 | unsigned long cmd, | |
879 | void *v) | |
880 | { | |
b20c9f29 MZ |
881 | if (cmd == CPU_PM_EXIT && |
882 | __hyp_get_vectors() == hyp_default_vectors) { | |
1fcf7ce0 LP |
883 | cpu_init_hyp_mode(NULL); |
884 | return NOTIFY_OK; | |
885 | } | |
886 | ||
887 | return NOTIFY_DONE; | |
888 | } | |
889 | ||
890 | static struct notifier_block hyp_init_cpu_pm_nb = { | |
891 | .notifier_call = hyp_init_cpu_pm_notifier, | |
892 | }; | |
893 | ||
894 | static void __init hyp_cpu_pm_init(void) | |
895 | { | |
896 | cpu_pm_register_notifier(&hyp_init_cpu_pm_nb); | |
897 | } | |
898 | #else | |
899 | static inline void hyp_cpu_pm_init(void) | |
900 | { | |
901 | } | |
902 | #endif | |
903 | ||
342cd0ab CD |
904 | /** |
905 | * Inits Hyp-mode on all online CPUs | |
906 | */ | |
907 | static int init_hyp_mode(void) | |
908 | { | |
342cd0ab CD |
909 | int cpu; |
910 | int err = 0; | |
911 | ||
912 | /* | |
913 | * Allocate Hyp PGD and setup Hyp identity mapping | |
914 | */ | |
915 | err = kvm_mmu_init(); | |
916 | if (err) | |
917 | goto out_err; | |
918 | ||
919 | /* | |
920 | * It is probably enough to obtain the default on one | |
921 | * CPU. It's unlikely to be different on the others. | |
922 | */ | |
923 | hyp_default_vectors = __hyp_get_vectors(); | |
924 | ||
925 | /* | |
926 | * Allocate stack pages for Hypervisor-mode | |
927 | */ | |
928 | for_each_possible_cpu(cpu) { | |
929 | unsigned long stack_page; | |
930 | ||
931 | stack_page = __get_free_page(GFP_KERNEL); | |
932 | if (!stack_page) { | |
933 | err = -ENOMEM; | |
934 | goto out_free_stack_pages; | |
935 | } | |
936 | ||
937 | per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; | |
938 | } | |
939 | ||
342cd0ab CD |
940 | /* |
941 | * Map the Hyp-code called directly from the host | |
942 | */ | |
943 | err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end); | |
944 | if (err) { | |
945 | kvm_err("Cannot map world-switch code\n"); | |
946 | goto out_free_mappings; | |
947 | } | |
948 | ||
949 | /* | |
950 | * Map the Hyp stack pages | |
951 | */ | |
952 | for_each_possible_cpu(cpu) { | |
953 | char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); | |
954 | err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE); | |
955 | ||
956 | if (err) { | |
957 | kvm_err("Cannot map hyp stack\n"); | |
958 | goto out_free_mappings; | |
959 | } | |
960 | } | |
961 | ||
962 | /* | |
3de50da6 | 963 | * Map the host CPU structures |
342cd0ab | 964 | */ |
3de50da6 MZ |
965 | kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t); |
966 | if (!kvm_host_cpu_state) { | |
342cd0ab | 967 | err = -ENOMEM; |
3de50da6 | 968 | kvm_err("Cannot allocate host CPU state\n"); |
342cd0ab CD |
969 | goto out_free_mappings; |
970 | } | |
971 | ||
972 | for_each_possible_cpu(cpu) { | |
3de50da6 | 973 | kvm_cpu_context_t *cpu_ctxt; |
342cd0ab | 974 | |
3de50da6 MZ |
975 | cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu); |
976 | err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1); | |
342cd0ab CD |
977 | |
978 | if (err) { | |
3de50da6 MZ |
979 | kvm_err("Cannot map host CPU state: %d\n", err); |
980 | goto out_free_context; | |
342cd0ab CD |
981 | } |
982 | } | |
983 | ||
d157f4a5 MZ |
984 | /* |
985 | * Execute the init code on each CPU. | |
986 | */ | |
987 | on_each_cpu(cpu_init_hyp_mode, NULL, 1); | |
988 | ||
1a89dd91 MZ |
989 | /* |
990 | * Init HYP view of VGIC | |
991 | */ | |
992 | err = kvm_vgic_hyp_init(); | |
993 | if (err) | |
3de50da6 | 994 | goto out_free_context; |
1a89dd91 | 995 | |
01ac5e34 MZ |
996 | #ifdef CONFIG_KVM_ARM_VGIC |
997 | vgic_present = true; | |
998 | #endif | |
999 | ||
967f8427 MZ |
1000 | /* |
1001 | * Init HYP architected timer support | |
1002 | */ | |
1003 | err = kvm_timer_hyp_init(); | |
1004 | if (err) | |
1005 | goto out_free_mappings; | |
1006 | ||
d157f4a5 MZ |
1007 | #ifndef CONFIG_HOTPLUG_CPU |
1008 | free_boot_hyp_pgd(); | |
1009 | #endif | |
1010 | ||
210552c1 MZ |
1011 | kvm_perf_init(); |
1012 | ||
342cd0ab | 1013 | kvm_info("Hyp mode initialized successfully\n"); |
210552c1 | 1014 | |
342cd0ab | 1015 | return 0; |
3de50da6 MZ |
1016 | out_free_context: |
1017 | free_percpu(kvm_host_cpu_state); | |
342cd0ab | 1018 | out_free_mappings: |
4f728276 | 1019 | free_hyp_pgds(); |
342cd0ab CD |
1020 | out_free_stack_pages: |
1021 | for_each_possible_cpu(cpu) | |
1022 | free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); | |
1023 | out_err: | |
1024 | kvm_err("error initializing Hyp mode: %d\n", err); | |
1025 | return err; | |
1026 | } | |
1027 | ||
d4e071ce AP |
1028 | static void check_kvm_target_cpu(void *ret) |
1029 | { | |
1030 | *(int *)ret = kvm_target_cpu(); | |
1031 | } | |
1032 | ||
342cd0ab CD |
1033 | /** |
1034 | * Initialize Hyp-mode and memory mappings on all CPUs. | |
1035 | */ | |
749cf76c CD |
1036 | int kvm_arch_init(void *opaque) |
1037 | { | |
342cd0ab | 1038 | int err; |
d4e071ce | 1039 | int ret, cpu; |
342cd0ab CD |
1040 | |
1041 | if (!is_hyp_mode_available()) { | |
1042 | kvm_err("HYP mode not available\n"); | |
1043 | return -ENODEV; | |
1044 | } | |
1045 | ||
d4e071ce AP |
1046 | for_each_online_cpu(cpu) { |
1047 | smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1); | |
1048 | if (ret < 0) { | |
1049 | kvm_err("Error, CPU %d not supported!\n", cpu); | |
1050 | return -ENODEV; | |
1051 | } | |
342cd0ab CD |
1052 | } |
1053 | ||
8146875d SB |
1054 | cpu_notifier_register_begin(); |
1055 | ||
342cd0ab CD |
1056 | err = init_hyp_mode(); |
1057 | if (err) | |
1058 | goto out_err; | |
1059 | ||
8146875d | 1060 | err = __register_cpu_notifier(&hyp_init_cpu_nb); |
d157f4a5 MZ |
1061 | if (err) { |
1062 | kvm_err("Cannot register HYP init CPU notifier (%d)\n", err); | |
1063 | goto out_err; | |
1064 | } | |
1065 | ||
8146875d SB |
1066 | cpu_notifier_register_done(); |
1067 | ||
1fcf7ce0 LP |
1068 | hyp_cpu_pm_init(); |
1069 | ||
5b3e5e5b | 1070 | kvm_coproc_table_init(); |
749cf76c | 1071 | return 0; |
342cd0ab | 1072 | out_err: |
8146875d | 1073 | cpu_notifier_register_done(); |
342cd0ab | 1074 | return err; |
749cf76c CD |
1075 | } |
1076 | ||
1077 | /* NOP: Compiling as a module not supported */ | |
1078 | void kvm_arch_exit(void) | |
1079 | { | |
210552c1 | 1080 | kvm_perf_teardown(); |
749cf76c CD |
1081 | } |
1082 | ||
1083 | static int arm_init(void) | |
1084 | { | |
1085 | int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); | |
1086 | return rc; | |
1087 | } | |
1088 | ||
1089 | module_init(arm_init); |