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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 | ||
749cf76c | 158 | |
d5d8184d CD |
159 | /** |
160 | * kvm_arch_destroy_vm - destroy the VM data structure | |
161 | * @kvm: pointer to the KVM struct | |
162 | */ | |
749cf76c CD |
163 | void kvm_arch_destroy_vm(struct kvm *kvm) |
164 | { | |
165 | int i; | |
166 | ||
d5d8184d CD |
167 | kvm_free_stage2_pgd(kvm); |
168 | ||
749cf76c CD |
169 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
170 | if (kvm->vcpus[i]) { | |
171 | kvm_arch_vcpu_free(kvm->vcpus[i]); | |
172 | kvm->vcpus[i] = NULL; | |
173 | } | |
174 | } | |
175 | } | |
176 | ||
784aa3d7 | 177 | int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) |
749cf76c CD |
178 | { |
179 | int r; | |
180 | switch (ext) { | |
1a89dd91 MZ |
181 | case KVM_CAP_IRQCHIP: |
182 | r = vgic_present; | |
183 | break; | |
7330672b | 184 | case KVM_CAP_DEVICE_CTRL: |
749cf76c CD |
185 | case KVM_CAP_USER_MEMORY: |
186 | case KVM_CAP_SYNC_MMU: | |
187 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
188 | case KVM_CAP_ONE_REG: | |
aa024c2f | 189 | case KVM_CAP_ARM_PSCI: |
4447a208 | 190 | case KVM_CAP_ARM_PSCI_0_2: |
749cf76c CD |
191 | r = 1; |
192 | break; | |
193 | case KVM_CAP_COALESCED_MMIO: | |
194 | r = KVM_COALESCED_MMIO_PAGE_OFFSET; | |
195 | break; | |
3401d546 CD |
196 | case KVM_CAP_ARM_SET_DEVICE_ADDR: |
197 | r = 1; | |
ca46e10f | 198 | break; |
749cf76c CD |
199 | case KVM_CAP_NR_VCPUS: |
200 | r = num_online_cpus(); | |
201 | break; | |
202 | case KVM_CAP_MAX_VCPUS: | |
203 | r = KVM_MAX_VCPUS; | |
204 | break; | |
205 | default: | |
17b1e31f | 206 | r = kvm_arch_dev_ioctl_check_extension(ext); |
749cf76c CD |
207 | break; |
208 | } | |
209 | return r; | |
210 | } | |
211 | ||
212 | long kvm_arch_dev_ioctl(struct file *filp, | |
213 | unsigned int ioctl, unsigned long arg) | |
214 | { | |
215 | return -EINVAL; | |
216 | } | |
217 | ||
749cf76c CD |
218 | |
219 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) | |
220 | { | |
221 | int err; | |
222 | struct kvm_vcpu *vcpu; | |
223 | ||
224 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
225 | if (!vcpu) { | |
226 | err = -ENOMEM; | |
227 | goto out; | |
228 | } | |
229 | ||
230 | err = kvm_vcpu_init(vcpu, kvm, id); | |
231 | if (err) | |
232 | goto free_vcpu; | |
233 | ||
d5d8184d CD |
234 | err = create_hyp_mappings(vcpu, vcpu + 1); |
235 | if (err) | |
236 | goto vcpu_uninit; | |
237 | ||
749cf76c | 238 | return vcpu; |
d5d8184d CD |
239 | vcpu_uninit: |
240 | kvm_vcpu_uninit(vcpu); | |
749cf76c CD |
241 | free_vcpu: |
242 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
243 | out: | |
244 | return ERR_PTR(err); | |
245 | } | |
246 | ||
247 | int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) | |
248 | { | |
249 | return 0; | |
250 | } | |
251 | ||
252 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
253 | { | |
d5d8184d | 254 | kvm_mmu_free_memory_caches(vcpu); |
967f8427 | 255 | kvm_timer_vcpu_terminate(vcpu); |
d5d8184d | 256 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
749cf76c CD |
257 | } |
258 | ||
259 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
260 | { | |
261 | kvm_arch_vcpu_free(vcpu); | |
262 | } | |
263 | ||
264 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
265 | { | |
266 | return 0; | |
267 | } | |
268 | ||
749cf76c CD |
269 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) |
270 | { | |
1a89dd91 MZ |
271 | int ret; |
272 | ||
f7ed45be CD |
273 | /* Force users to call KVM_ARM_VCPU_INIT */ |
274 | vcpu->arch.target = -1; | |
1a89dd91 MZ |
275 | |
276 | /* Set up VGIC */ | |
277 | ret = kvm_vgic_vcpu_init(vcpu); | |
278 | if (ret) | |
279 | return ret; | |
280 | ||
967f8427 MZ |
281 | /* Set up the timer */ |
282 | kvm_timer_vcpu_init(vcpu); | |
283 | ||
749cf76c CD |
284 | return 0; |
285 | } | |
286 | ||
287 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) | |
288 | { | |
289 | } | |
290 | ||
291 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
292 | { | |
86ce8535 | 293 | vcpu->cpu = cpu; |
3de50da6 | 294 | vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state); |
5b3e5e5b CD |
295 | |
296 | /* | |
297 | * Check whether this vcpu requires the cache to be flushed on | |
298 | * this physical CPU. This is a consequence of doing dcache | |
299 | * operations by set/way on this vcpu. We do it here to be in | |
300 | * a non-preemptible section. | |
301 | */ | |
302 | if (cpumask_test_and_clear_cpu(cpu, &vcpu->arch.require_dcache_flush)) | |
303 | flush_cache_all(); /* We'd really want v7_flush_dcache_all() */ | |
1638a12d MZ |
304 | |
305 | kvm_arm_set_running_vcpu(vcpu); | |
749cf76c CD |
306 | } |
307 | ||
308 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
309 | { | |
e9b152cb CD |
310 | /* |
311 | * The arch-generic KVM code expects the cpu field of a vcpu to be -1 | |
312 | * if the vcpu is no longer assigned to a cpu. This is used for the | |
313 | * optimized make_all_cpus_request path. | |
314 | */ | |
315 | vcpu->cpu = -1; | |
316 | ||
1638a12d | 317 | kvm_arm_set_running_vcpu(NULL); |
749cf76c CD |
318 | } |
319 | ||
320 | int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, | |
321 | struct kvm_guest_debug *dbg) | |
322 | { | |
323 | return -EINVAL; | |
324 | } | |
325 | ||
326 | ||
327 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, | |
328 | struct kvm_mp_state *mp_state) | |
329 | { | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
334 | struct kvm_mp_state *mp_state) | |
335 | { | |
336 | return -EINVAL; | |
337 | } | |
338 | ||
5b3e5e5b CD |
339 | /** |
340 | * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled | |
341 | * @v: The VCPU pointer | |
342 | * | |
343 | * If the guest CPU is not waiting for interrupts or an interrupt line is | |
344 | * asserted, the CPU is by definition runnable. | |
345 | */ | |
749cf76c CD |
346 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) |
347 | { | |
1a89dd91 | 348 | return !!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v); |
749cf76c CD |
349 | } |
350 | ||
f7ed45be CD |
351 | /* Just ensure a guest exit from a particular CPU */ |
352 | static void exit_vm_noop(void *info) | |
353 | { | |
354 | } | |
355 | ||
356 | void force_vm_exit(const cpumask_t *mask) | |
357 | { | |
358 | smp_call_function_many(mask, exit_vm_noop, NULL, true); | |
359 | } | |
360 | ||
361 | /** | |
362 | * need_new_vmid_gen - check that the VMID is still valid | |
363 | * @kvm: The VM's VMID to checkt | |
364 | * | |
365 | * return true if there is a new generation of VMIDs being used | |
366 | * | |
367 | * The hardware supports only 256 values with the value zero reserved for the | |
368 | * host, so we check if an assigned value belongs to a previous generation, | |
369 | * which which requires us to assign a new value. If we're the first to use a | |
370 | * VMID for the new generation, we must flush necessary caches and TLBs on all | |
371 | * CPUs. | |
372 | */ | |
373 | static bool need_new_vmid_gen(struct kvm *kvm) | |
374 | { | |
375 | return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); | |
376 | } | |
377 | ||
378 | /** | |
379 | * update_vttbr - Update the VTTBR with a valid VMID before the guest runs | |
380 | * @kvm The guest that we are about to run | |
381 | * | |
382 | * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the | |
383 | * VM has a valid VMID, otherwise assigns a new one and flushes corresponding | |
384 | * caches and TLBs. | |
385 | */ | |
386 | static void update_vttbr(struct kvm *kvm) | |
387 | { | |
388 | phys_addr_t pgd_phys; | |
389 | u64 vmid; | |
390 | ||
391 | if (!need_new_vmid_gen(kvm)) | |
392 | return; | |
393 | ||
394 | spin_lock(&kvm_vmid_lock); | |
395 | ||
396 | /* | |
397 | * We need to re-check the vmid_gen here to ensure that if another vcpu | |
398 | * already allocated a valid vmid for this vm, then this vcpu should | |
399 | * use the same vmid. | |
400 | */ | |
401 | if (!need_new_vmid_gen(kvm)) { | |
402 | spin_unlock(&kvm_vmid_lock); | |
403 | return; | |
404 | } | |
405 | ||
406 | /* First user of a new VMID generation? */ | |
407 | if (unlikely(kvm_next_vmid == 0)) { | |
408 | atomic64_inc(&kvm_vmid_gen); | |
409 | kvm_next_vmid = 1; | |
410 | ||
411 | /* | |
412 | * On SMP we know no other CPUs can use this CPU's or each | |
413 | * other's VMID after force_vm_exit returns since the | |
414 | * kvm_vmid_lock blocks them from reentry to the guest. | |
415 | */ | |
416 | force_vm_exit(cpu_all_mask); | |
417 | /* | |
418 | * Now broadcast TLB + ICACHE invalidation over the inner | |
419 | * shareable domain to make sure all data structures are | |
420 | * clean. | |
421 | */ | |
422 | kvm_call_hyp(__kvm_flush_vm_context); | |
423 | } | |
424 | ||
425 | kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); | |
426 | kvm->arch.vmid = kvm_next_vmid; | |
427 | kvm_next_vmid++; | |
428 | ||
429 | /* update vttbr to be used with the new vmid */ | |
430 | pgd_phys = virt_to_phys(kvm->arch.pgd); | |
431 | vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK; | |
432 | kvm->arch.vttbr = pgd_phys & VTTBR_BADDR_MASK; | |
433 | kvm->arch.vttbr |= vmid; | |
434 | ||
435 | spin_unlock(&kvm_vmid_lock); | |
436 | } | |
437 | ||
f7ed45be CD |
438 | static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) |
439 | { | |
e1ba0207 CD |
440 | int ret; |
441 | ||
f7ed45be CD |
442 | if (likely(vcpu->arch.has_run_once)) |
443 | return 0; | |
444 | ||
445 | vcpu->arch.has_run_once = true; | |
aa024c2f | 446 | |
01ac5e34 MZ |
447 | /* |
448 | * Initialize the VGIC before running a vcpu the first time on | |
449 | * this VM. | |
450 | */ | |
e1ba0207 CD |
451 | if (unlikely(!vgic_initialized(vcpu->kvm))) { |
452 | ret = kvm_vgic_init(vcpu->kvm); | |
01ac5e34 MZ |
453 | if (ret) |
454 | return ret; | |
455 | } | |
456 | ||
f7ed45be CD |
457 | return 0; |
458 | } | |
459 | ||
aa024c2f MZ |
460 | static void vcpu_pause(struct kvm_vcpu *vcpu) |
461 | { | |
462 | wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); | |
463 | ||
464 | wait_event_interruptible(*wq, !vcpu->arch.pause); | |
465 | } | |
466 | ||
e8180dca AP |
467 | static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) |
468 | { | |
469 | return vcpu->arch.target >= 0; | |
470 | } | |
471 | ||
f7ed45be CD |
472 | /** |
473 | * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code | |
474 | * @vcpu: The VCPU pointer | |
475 | * @run: The kvm_run structure pointer used for userspace state exchange | |
476 | * | |
477 | * This function is called through the VCPU_RUN ioctl called from user space. It | |
478 | * will execute VM code in a loop until the time slice for the process is used | |
479 | * or some emulation is needed from user space in which case the function will | |
480 | * return with return value 0 and with the kvm_run structure filled in with the | |
481 | * required data for the requested emulation. | |
482 | */ | |
749cf76c CD |
483 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) |
484 | { | |
f7ed45be CD |
485 | int ret; |
486 | sigset_t sigsaved; | |
487 | ||
e8180dca | 488 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
f7ed45be CD |
489 | return -ENOEXEC; |
490 | ||
491 | ret = kvm_vcpu_first_run_init(vcpu); | |
492 | if (ret) | |
493 | return ret; | |
494 | ||
45e96ea6 CD |
495 | if (run->exit_reason == KVM_EXIT_MMIO) { |
496 | ret = kvm_handle_mmio_return(vcpu, vcpu->run); | |
497 | if (ret) | |
498 | return ret; | |
499 | } | |
500 | ||
f7ed45be CD |
501 | if (vcpu->sigset_active) |
502 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
503 | ||
504 | ret = 1; | |
505 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
506 | while (ret > 0) { | |
507 | /* | |
508 | * Check conditions before entering the guest | |
509 | */ | |
510 | cond_resched(); | |
511 | ||
512 | update_vttbr(vcpu->kvm); | |
513 | ||
aa024c2f MZ |
514 | if (vcpu->arch.pause) |
515 | vcpu_pause(vcpu); | |
516 | ||
1a89dd91 | 517 | kvm_vgic_flush_hwstate(vcpu); |
c7e3ba64 | 518 | kvm_timer_flush_hwstate(vcpu); |
1a89dd91 | 519 | |
f7ed45be CD |
520 | local_irq_disable(); |
521 | ||
522 | /* | |
523 | * Re-check atomic conditions | |
524 | */ | |
525 | if (signal_pending(current)) { | |
526 | ret = -EINTR; | |
527 | run->exit_reason = KVM_EXIT_INTR; | |
528 | } | |
529 | ||
530 | if (ret <= 0 || need_new_vmid_gen(vcpu->kvm)) { | |
531 | local_irq_enable(); | |
c7e3ba64 | 532 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 | 533 | kvm_vgic_sync_hwstate(vcpu); |
f7ed45be CD |
534 | continue; |
535 | } | |
536 | ||
537 | /************************************************************** | |
538 | * Enter the guest | |
539 | */ | |
540 | trace_kvm_entry(*vcpu_pc(vcpu)); | |
541 | kvm_guest_enter(); | |
542 | vcpu->mode = IN_GUEST_MODE; | |
543 | ||
544 | ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); | |
545 | ||
546 | vcpu->mode = OUTSIDE_GUEST_MODE; | |
5b3e5e5b | 547 | vcpu->arch.last_pcpu = smp_processor_id(); |
f7ed45be CD |
548 | kvm_guest_exit(); |
549 | trace_kvm_exit(*vcpu_pc(vcpu)); | |
550 | /* | |
551 | * We may have taken a host interrupt in HYP mode (ie | |
552 | * while executing the guest). This interrupt is still | |
553 | * pending, as we haven't serviced it yet! | |
554 | * | |
555 | * We're now back in SVC mode, with interrupts | |
556 | * disabled. Enabling the interrupts now will have | |
557 | * the effect of taking the interrupt again, in SVC | |
558 | * mode this time. | |
559 | */ | |
560 | local_irq_enable(); | |
561 | ||
562 | /* | |
563 | * Back from guest | |
564 | *************************************************************/ | |
565 | ||
c7e3ba64 | 566 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 MZ |
567 | kvm_vgic_sync_hwstate(vcpu); |
568 | ||
f7ed45be CD |
569 | ret = handle_exit(vcpu, run, ret); |
570 | } | |
571 | ||
572 | if (vcpu->sigset_active) | |
573 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
574 | return ret; | |
749cf76c CD |
575 | } |
576 | ||
86ce8535 CD |
577 | static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) |
578 | { | |
579 | int bit_index; | |
580 | bool set; | |
581 | unsigned long *ptr; | |
582 | ||
583 | if (number == KVM_ARM_IRQ_CPU_IRQ) | |
584 | bit_index = __ffs(HCR_VI); | |
585 | else /* KVM_ARM_IRQ_CPU_FIQ */ | |
586 | bit_index = __ffs(HCR_VF); | |
587 | ||
588 | ptr = (unsigned long *)&vcpu->arch.irq_lines; | |
589 | if (level) | |
590 | set = test_and_set_bit(bit_index, ptr); | |
591 | else | |
592 | set = test_and_clear_bit(bit_index, ptr); | |
593 | ||
594 | /* | |
595 | * If we didn't change anything, no need to wake up or kick other CPUs | |
596 | */ | |
597 | if (set == level) | |
598 | return 0; | |
599 | ||
600 | /* | |
601 | * The vcpu irq_lines field was updated, wake up sleeping VCPUs and | |
602 | * trigger a world-switch round on the running physical CPU to set the | |
603 | * virtual IRQ/FIQ fields in the HCR appropriately. | |
604 | */ | |
605 | kvm_vcpu_kick(vcpu); | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
79558f11 AG |
610 | int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, |
611 | bool line_status) | |
86ce8535 CD |
612 | { |
613 | u32 irq = irq_level->irq; | |
614 | unsigned int irq_type, vcpu_idx, irq_num; | |
615 | int nrcpus = atomic_read(&kvm->online_vcpus); | |
616 | struct kvm_vcpu *vcpu = NULL; | |
617 | bool level = irq_level->level; | |
618 | ||
619 | irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; | |
620 | vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; | |
621 | irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; | |
622 | ||
623 | trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); | |
624 | ||
5863c2ce MZ |
625 | switch (irq_type) { |
626 | case KVM_ARM_IRQ_TYPE_CPU: | |
627 | if (irqchip_in_kernel(kvm)) | |
628 | return -ENXIO; | |
86ce8535 | 629 | |
5863c2ce MZ |
630 | if (vcpu_idx >= nrcpus) |
631 | return -EINVAL; | |
86ce8535 | 632 | |
5863c2ce MZ |
633 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); |
634 | if (!vcpu) | |
635 | return -EINVAL; | |
86ce8535 | 636 | |
5863c2ce MZ |
637 | if (irq_num > KVM_ARM_IRQ_CPU_FIQ) |
638 | return -EINVAL; | |
639 | ||
640 | return vcpu_interrupt_line(vcpu, irq_num, level); | |
641 | case KVM_ARM_IRQ_TYPE_PPI: | |
642 | if (!irqchip_in_kernel(kvm)) | |
643 | return -ENXIO; | |
644 | ||
645 | if (vcpu_idx >= nrcpus) | |
646 | return -EINVAL; | |
647 | ||
648 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); | |
649 | if (!vcpu) | |
650 | return -EINVAL; | |
651 | ||
652 | if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) | |
653 | return -EINVAL; | |
86ce8535 | 654 | |
5863c2ce MZ |
655 | return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); |
656 | case KVM_ARM_IRQ_TYPE_SPI: | |
657 | if (!irqchip_in_kernel(kvm)) | |
658 | return -ENXIO; | |
659 | ||
660 | if (irq_num < VGIC_NR_PRIVATE_IRQS || | |
661 | irq_num > KVM_ARM_IRQ_GIC_MAX) | |
662 | return -EINVAL; | |
663 | ||
664 | return kvm_vgic_inject_irq(kvm, 0, irq_num, level); | |
665 | } | |
666 | ||
667 | return -EINVAL; | |
86ce8535 CD |
668 | } |
669 | ||
478a8237 CD |
670 | static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, |
671 | struct kvm_vcpu_init *init) | |
672 | { | |
673 | int ret; | |
674 | ||
675 | ret = kvm_vcpu_set_target(vcpu, init); | |
676 | if (ret) | |
677 | return ret; | |
678 | ||
679 | /* | |
680 | * Handle the "start in power-off" case by marking the VCPU as paused. | |
681 | */ | |
682 | if (__test_and_clear_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) | |
683 | vcpu->arch.pause = true; | |
684 | ||
685 | return 0; | |
686 | } | |
687 | ||
749cf76c CD |
688 | long kvm_arch_vcpu_ioctl(struct file *filp, |
689 | unsigned int ioctl, unsigned long arg) | |
690 | { | |
691 | struct kvm_vcpu *vcpu = filp->private_data; | |
692 | void __user *argp = (void __user *)arg; | |
693 | ||
694 | switch (ioctl) { | |
695 | case KVM_ARM_VCPU_INIT: { | |
696 | struct kvm_vcpu_init init; | |
697 | ||
698 | if (copy_from_user(&init, argp, sizeof(init))) | |
699 | return -EFAULT; | |
700 | ||
478a8237 | 701 | return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); |
749cf76c CD |
702 | } |
703 | case KVM_SET_ONE_REG: | |
704 | case KVM_GET_ONE_REG: { | |
705 | struct kvm_one_reg reg; | |
e8180dca AP |
706 | |
707 | if (unlikely(!kvm_vcpu_initialized(vcpu))) | |
708 | return -ENOEXEC; | |
709 | ||
749cf76c CD |
710 | if (copy_from_user(®, argp, sizeof(reg))) |
711 | return -EFAULT; | |
712 | if (ioctl == KVM_SET_ONE_REG) | |
713 | return kvm_arm_set_reg(vcpu, ®); | |
714 | else | |
715 | return kvm_arm_get_reg(vcpu, ®); | |
716 | } | |
717 | case KVM_GET_REG_LIST: { | |
718 | struct kvm_reg_list __user *user_list = argp; | |
719 | struct kvm_reg_list reg_list; | |
720 | unsigned n; | |
721 | ||
e8180dca AP |
722 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
723 | return -ENOEXEC; | |
724 | ||
749cf76c CD |
725 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) |
726 | return -EFAULT; | |
727 | n = reg_list.n; | |
728 | reg_list.n = kvm_arm_num_regs(vcpu); | |
729 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) | |
730 | return -EFAULT; | |
731 | if (n < reg_list.n) | |
732 | return -E2BIG; | |
733 | return kvm_arm_copy_reg_indices(vcpu, user_list->reg); | |
734 | } | |
735 | default: | |
736 | return -EINVAL; | |
737 | } | |
738 | } | |
739 | ||
740 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) | |
741 | { | |
742 | return -EINVAL; | |
743 | } | |
744 | ||
3401d546 CD |
745 | static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, |
746 | struct kvm_arm_device_addr *dev_addr) | |
747 | { | |
330690cd CD |
748 | unsigned long dev_id, type; |
749 | ||
750 | dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> | |
751 | KVM_ARM_DEVICE_ID_SHIFT; | |
752 | type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> | |
753 | KVM_ARM_DEVICE_TYPE_SHIFT; | |
754 | ||
755 | switch (dev_id) { | |
756 | case KVM_ARM_DEVICE_VGIC_V2: | |
757 | if (!vgic_present) | |
758 | return -ENXIO; | |
ce01e4e8 | 759 | return kvm_vgic_addr(kvm, type, &dev_addr->addr, true); |
330690cd CD |
760 | default: |
761 | return -ENODEV; | |
762 | } | |
3401d546 CD |
763 | } |
764 | ||
749cf76c CD |
765 | long kvm_arch_vm_ioctl(struct file *filp, |
766 | unsigned int ioctl, unsigned long arg) | |
767 | { | |
3401d546 CD |
768 | struct kvm *kvm = filp->private_data; |
769 | void __user *argp = (void __user *)arg; | |
770 | ||
771 | switch (ioctl) { | |
5863c2ce MZ |
772 | case KVM_CREATE_IRQCHIP: { |
773 | if (vgic_present) | |
774 | return kvm_vgic_create(kvm); | |
775 | else | |
776 | return -ENXIO; | |
777 | } | |
3401d546 CD |
778 | case KVM_ARM_SET_DEVICE_ADDR: { |
779 | struct kvm_arm_device_addr dev_addr; | |
780 | ||
781 | if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) | |
782 | return -EFAULT; | |
783 | return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); | |
784 | } | |
42c4e0c7 AP |
785 | case KVM_ARM_PREFERRED_TARGET: { |
786 | int err; | |
787 | struct kvm_vcpu_init init; | |
788 | ||
789 | err = kvm_vcpu_preferred_target(&init); | |
790 | if (err) | |
791 | return err; | |
792 | ||
793 | if (copy_to_user(argp, &init, sizeof(init))) | |
794 | return -EFAULT; | |
795 | ||
796 | return 0; | |
797 | } | |
3401d546 CD |
798 | default: |
799 | return -EINVAL; | |
800 | } | |
749cf76c CD |
801 | } |
802 | ||
d157f4a5 | 803 | static void cpu_init_hyp_mode(void *dummy) |
342cd0ab | 804 | { |
dac288f7 MZ |
805 | phys_addr_t boot_pgd_ptr; |
806 | phys_addr_t pgd_ptr; | |
342cd0ab CD |
807 | unsigned long hyp_stack_ptr; |
808 | unsigned long stack_page; | |
809 | unsigned long vector_ptr; | |
810 | ||
811 | /* Switch from the HYP stub to our own HYP init vector */ | |
5a677ce0 | 812 | __hyp_set_vectors(kvm_get_idmap_vector()); |
342cd0ab | 813 | |
dac288f7 MZ |
814 | boot_pgd_ptr = kvm_mmu_get_boot_httbr(); |
815 | pgd_ptr = kvm_mmu_get_httbr(); | |
1436c1aa | 816 | stack_page = __this_cpu_read(kvm_arm_hyp_stack_page); |
342cd0ab CD |
817 | hyp_stack_ptr = stack_page + PAGE_SIZE; |
818 | vector_ptr = (unsigned long)__kvm_hyp_vector; | |
819 | ||
5a677ce0 | 820 | __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr); |
342cd0ab CD |
821 | } |
822 | ||
d157f4a5 MZ |
823 | static int hyp_init_cpu_notify(struct notifier_block *self, |
824 | unsigned long action, void *cpu) | |
825 | { | |
826 | switch (action) { | |
827 | case CPU_STARTING: | |
828 | case CPU_STARTING_FROZEN: | |
829 | cpu_init_hyp_mode(NULL); | |
830 | break; | |
831 | } | |
832 | ||
833 | return NOTIFY_OK; | |
342cd0ab CD |
834 | } |
835 | ||
d157f4a5 MZ |
836 | static struct notifier_block hyp_init_cpu_nb = { |
837 | .notifier_call = hyp_init_cpu_notify, | |
838 | }; | |
839 | ||
1fcf7ce0 LP |
840 | #ifdef CONFIG_CPU_PM |
841 | static int hyp_init_cpu_pm_notifier(struct notifier_block *self, | |
842 | unsigned long cmd, | |
843 | void *v) | |
844 | { | |
b20c9f29 MZ |
845 | if (cmd == CPU_PM_EXIT && |
846 | __hyp_get_vectors() == hyp_default_vectors) { | |
1fcf7ce0 LP |
847 | cpu_init_hyp_mode(NULL); |
848 | return NOTIFY_OK; | |
849 | } | |
850 | ||
851 | return NOTIFY_DONE; | |
852 | } | |
853 | ||
854 | static struct notifier_block hyp_init_cpu_pm_nb = { | |
855 | .notifier_call = hyp_init_cpu_pm_notifier, | |
856 | }; | |
857 | ||
858 | static void __init hyp_cpu_pm_init(void) | |
859 | { | |
860 | cpu_pm_register_notifier(&hyp_init_cpu_pm_nb); | |
861 | } | |
862 | #else | |
863 | static inline void hyp_cpu_pm_init(void) | |
864 | { | |
865 | } | |
866 | #endif | |
867 | ||
342cd0ab CD |
868 | /** |
869 | * Inits Hyp-mode on all online CPUs | |
870 | */ | |
871 | static int init_hyp_mode(void) | |
872 | { | |
342cd0ab CD |
873 | int cpu; |
874 | int err = 0; | |
875 | ||
876 | /* | |
877 | * Allocate Hyp PGD and setup Hyp identity mapping | |
878 | */ | |
879 | err = kvm_mmu_init(); | |
880 | if (err) | |
881 | goto out_err; | |
882 | ||
883 | /* | |
884 | * It is probably enough to obtain the default on one | |
885 | * CPU. It's unlikely to be different on the others. | |
886 | */ | |
887 | hyp_default_vectors = __hyp_get_vectors(); | |
888 | ||
889 | /* | |
890 | * Allocate stack pages for Hypervisor-mode | |
891 | */ | |
892 | for_each_possible_cpu(cpu) { | |
893 | unsigned long stack_page; | |
894 | ||
895 | stack_page = __get_free_page(GFP_KERNEL); | |
896 | if (!stack_page) { | |
897 | err = -ENOMEM; | |
898 | goto out_free_stack_pages; | |
899 | } | |
900 | ||
901 | per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; | |
902 | } | |
903 | ||
342cd0ab CD |
904 | /* |
905 | * Map the Hyp-code called directly from the host | |
906 | */ | |
907 | err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end); | |
908 | if (err) { | |
909 | kvm_err("Cannot map world-switch code\n"); | |
910 | goto out_free_mappings; | |
911 | } | |
912 | ||
913 | /* | |
914 | * Map the Hyp stack pages | |
915 | */ | |
916 | for_each_possible_cpu(cpu) { | |
917 | char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); | |
918 | err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE); | |
919 | ||
920 | if (err) { | |
921 | kvm_err("Cannot map hyp stack\n"); | |
922 | goto out_free_mappings; | |
923 | } | |
924 | } | |
925 | ||
926 | /* | |
3de50da6 | 927 | * Map the host CPU structures |
342cd0ab | 928 | */ |
3de50da6 MZ |
929 | kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t); |
930 | if (!kvm_host_cpu_state) { | |
342cd0ab | 931 | err = -ENOMEM; |
3de50da6 | 932 | kvm_err("Cannot allocate host CPU state\n"); |
342cd0ab CD |
933 | goto out_free_mappings; |
934 | } | |
935 | ||
936 | for_each_possible_cpu(cpu) { | |
3de50da6 | 937 | kvm_cpu_context_t *cpu_ctxt; |
342cd0ab | 938 | |
3de50da6 MZ |
939 | cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu); |
940 | err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1); | |
342cd0ab CD |
941 | |
942 | if (err) { | |
3de50da6 MZ |
943 | kvm_err("Cannot map host CPU state: %d\n", err); |
944 | goto out_free_context; | |
342cd0ab CD |
945 | } |
946 | } | |
947 | ||
d157f4a5 MZ |
948 | /* |
949 | * Execute the init code on each CPU. | |
950 | */ | |
951 | on_each_cpu(cpu_init_hyp_mode, NULL, 1); | |
952 | ||
1a89dd91 MZ |
953 | /* |
954 | * Init HYP view of VGIC | |
955 | */ | |
956 | err = kvm_vgic_hyp_init(); | |
957 | if (err) | |
3de50da6 | 958 | goto out_free_context; |
1a89dd91 | 959 | |
01ac5e34 MZ |
960 | #ifdef CONFIG_KVM_ARM_VGIC |
961 | vgic_present = true; | |
962 | #endif | |
963 | ||
967f8427 MZ |
964 | /* |
965 | * Init HYP architected timer support | |
966 | */ | |
967 | err = kvm_timer_hyp_init(); | |
968 | if (err) | |
969 | goto out_free_mappings; | |
970 | ||
d157f4a5 MZ |
971 | #ifndef CONFIG_HOTPLUG_CPU |
972 | free_boot_hyp_pgd(); | |
973 | #endif | |
974 | ||
210552c1 MZ |
975 | kvm_perf_init(); |
976 | ||
342cd0ab | 977 | kvm_info("Hyp mode initialized successfully\n"); |
210552c1 | 978 | |
342cd0ab | 979 | return 0; |
3de50da6 MZ |
980 | out_free_context: |
981 | free_percpu(kvm_host_cpu_state); | |
342cd0ab | 982 | out_free_mappings: |
4f728276 | 983 | free_hyp_pgds(); |
342cd0ab CD |
984 | out_free_stack_pages: |
985 | for_each_possible_cpu(cpu) | |
986 | free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); | |
987 | out_err: | |
988 | kvm_err("error initializing Hyp mode: %d\n", err); | |
989 | return err; | |
990 | } | |
991 | ||
d4e071ce AP |
992 | static void check_kvm_target_cpu(void *ret) |
993 | { | |
994 | *(int *)ret = kvm_target_cpu(); | |
995 | } | |
996 | ||
342cd0ab CD |
997 | /** |
998 | * Initialize Hyp-mode and memory mappings on all CPUs. | |
999 | */ | |
749cf76c CD |
1000 | int kvm_arch_init(void *opaque) |
1001 | { | |
342cd0ab | 1002 | int err; |
d4e071ce | 1003 | int ret, cpu; |
342cd0ab CD |
1004 | |
1005 | if (!is_hyp_mode_available()) { | |
1006 | kvm_err("HYP mode not available\n"); | |
1007 | return -ENODEV; | |
1008 | } | |
1009 | ||
d4e071ce AP |
1010 | for_each_online_cpu(cpu) { |
1011 | smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1); | |
1012 | if (ret < 0) { | |
1013 | kvm_err("Error, CPU %d not supported!\n", cpu); | |
1014 | return -ENODEV; | |
1015 | } | |
342cd0ab CD |
1016 | } |
1017 | ||
8146875d SB |
1018 | cpu_notifier_register_begin(); |
1019 | ||
342cd0ab CD |
1020 | err = init_hyp_mode(); |
1021 | if (err) | |
1022 | goto out_err; | |
1023 | ||
8146875d | 1024 | err = __register_cpu_notifier(&hyp_init_cpu_nb); |
d157f4a5 MZ |
1025 | if (err) { |
1026 | kvm_err("Cannot register HYP init CPU notifier (%d)\n", err); | |
1027 | goto out_err; | |
1028 | } | |
1029 | ||
8146875d SB |
1030 | cpu_notifier_register_done(); |
1031 | ||
1fcf7ce0 LP |
1032 | hyp_cpu_pm_init(); |
1033 | ||
5b3e5e5b | 1034 | kvm_coproc_table_init(); |
749cf76c | 1035 | return 0; |
342cd0ab | 1036 | out_err: |
8146875d | 1037 | cpu_notifier_register_done(); |
342cd0ab | 1038 | return err; |
749cf76c CD |
1039 | } |
1040 | ||
1041 | /* NOP: Compiling as a module not supported */ | |
1042 | void kvm_arch_exit(void) | |
1043 | { | |
210552c1 | 1044 | kvm_perf_teardown(); |
749cf76c CD |
1045 | } |
1046 | ||
1047 | static int arm_init(void) | |
1048 | { | |
1049 | int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); | |
1050 | return rc; | |
1051 | } | |
1052 | ||
1053 | module_init(arm_init); |