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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 | |
1638a12d MZ |
64 | static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu) |
65 | { | |
66 | BUG_ON(preemptible()); | |
1436c1aa | 67 | __this_cpu_write(kvm_arm_running_vcpu, vcpu); |
1638a12d MZ |
68 | } |
69 | ||
70 | /** | |
71 | * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU. | |
72 | * Must be called from non-preemptible context | |
73 | */ | |
74 | struct kvm_vcpu *kvm_arm_get_running_vcpu(void) | |
75 | { | |
76 | BUG_ON(preemptible()); | |
1436c1aa | 77 | return __this_cpu_read(kvm_arm_running_vcpu); |
1638a12d MZ |
78 | } |
79 | ||
80 | /** | |
81 | * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus. | |
82 | */ | |
4000be42 | 83 | struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void) |
1638a12d MZ |
84 | { |
85 | return &kvm_arm_running_vcpu; | |
86 | } | |
87 | ||
13a34e06 | 88 | int kvm_arch_hardware_enable(void) |
749cf76c CD |
89 | { |
90 | return 0; | |
91 | } | |
92 | ||
93 | int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) | |
94 | { | |
95 | return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; | |
96 | } | |
97 | ||
749cf76c CD |
98 | int kvm_arch_hardware_setup(void) |
99 | { | |
100 | return 0; | |
101 | } | |
102 | ||
749cf76c CD |
103 | void kvm_arch_check_processor_compat(void *rtn) |
104 | { | |
105 | *(int *)rtn = 0; | |
106 | } | |
107 | ||
749cf76c | 108 | |
d5d8184d CD |
109 | /** |
110 | * kvm_arch_init_vm - initializes a VM data structure | |
111 | * @kvm: pointer to the KVM struct | |
112 | */ | |
749cf76c CD |
113 | int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) |
114 | { | |
d5d8184d CD |
115 | int ret = 0; |
116 | ||
749cf76c CD |
117 | if (type) |
118 | return -EINVAL; | |
119 | ||
d5d8184d CD |
120 | ret = kvm_alloc_stage2_pgd(kvm); |
121 | if (ret) | |
122 | goto out_fail_alloc; | |
123 | ||
124 | ret = create_hyp_mappings(kvm, kvm + 1); | |
125 | if (ret) | |
126 | goto out_free_stage2_pgd; | |
127 | ||
6c3d63c9 | 128 | kvm_vgic_early_init(kvm); |
a1a64387 CD |
129 | kvm_timer_init(kvm); |
130 | ||
d5d8184d CD |
131 | /* Mark the initial VMID generation invalid */ |
132 | kvm->arch.vmid_gen = 0; | |
133 | ||
3caa2d8c AP |
134 | /* The maximum number of VCPUs is limited by the host's GIC model */ |
135 | kvm->arch.max_vcpus = kvm_vgic_get_max_vcpus(); | |
136 | ||
d5d8184d CD |
137 | return ret; |
138 | out_free_stage2_pgd: | |
139 | kvm_free_stage2_pgd(kvm); | |
140 | out_fail_alloc: | |
141 | return ret; | |
749cf76c CD |
142 | } |
143 | ||
144 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
145 | { | |
146 | return VM_FAULT_SIGBUS; | |
147 | } | |
148 | ||
749cf76c | 149 | |
d5d8184d CD |
150 | /** |
151 | * kvm_arch_destroy_vm - destroy the VM data structure | |
152 | * @kvm: pointer to the KVM struct | |
153 | */ | |
749cf76c CD |
154 | void kvm_arch_destroy_vm(struct kvm *kvm) |
155 | { | |
156 | int i; | |
157 | ||
d5d8184d CD |
158 | kvm_free_stage2_pgd(kvm); |
159 | ||
749cf76c CD |
160 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
161 | if (kvm->vcpus[i]) { | |
162 | kvm_arch_vcpu_free(kvm->vcpus[i]); | |
163 | kvm->vcpus[i] = NULL; | |
164 | } | |
165 | } | |
c1bfb577 MZ |
166 | |
167 | kvm_vgic_destroy(kvm); | |
749cf76c CD |
168 | } |
169 | ||
784aa3d7 | 170 | int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) |
749cf76c CD |
171 | { |
172 | int r; | |
173 | switch (ext) { | |
1a89dd91 | 174 | case KVM_CAP_IRQCHIP: |
d44758c0 | 175 | case KVM_CAP_IOEVENTFD: |
7330672b | 176 | case KVM_CAP_DEVICE_CTRL: |
749cf76c CD |
177 | case KVM_CAP_USER_MEMORY: |
178 | case KVM_CAP_SYNC_MMU: | |
179 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
180 | case KVM_CAP_ONE_REG: | |
aa024c2f | 181 | case KVM_CAP_ARM_PSCI: |
4447a208 | 182 | case KVM_CAP_ARM_PSCI_0_2: |
98047888 | 183 | case KVM_CAP_READONLY_MEM: |
ecccf0cc | 184 | case KVM_CAP_MP_STATE: |
749cf76c CD |
185 | r = 1; |
186 | break; | |
187 | case KVM_CAP_COALESCED_MMIO: | |
188 | r = KVM_COALESCED_MMIO_PAGE_OFFSET; | |
189 | break; | |
3401d546 CD |
190 | case KVM_CAP_ARM_SET_DEVICE_ADDR: |
191 | r = 1; | |
ca46e10f | 192 | break; |
749cf76c CD |
193 | case KVM_CAP_NR_VCPUS: |
194 | r = num_online_cpus(); | |
195 | break; | |
196 | case KVM_CAP_MAX_VCPUS: | |
197 | r = KVM_MAX_VCPUS; | |
198 | break; | |
199 | default: | |
17b1e31f | 200 | r = kvm_arch_dev_ioctl_check_extension(ext); |
749cf76c CD |
201 | break; |
202 | } | |
203 | return r; | |
204 | } | |
205 | ||
206 | long kvm_arch_dev_ioctl(struct file *filp, | |
207 | unsigned int ioctl, unsigned long arg) | |
208 | { | |
209 | return -EINVAL; | |
210 | } | |
211 | ||
749cf76c CD |
212 | |
213 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) | |
214 | { | |
215 | int err; | |
216 | struct kvm_vcpu *vcpu; | |
217 | ||
716139df CD |
218 | if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) { |
219 | err = -EBUSY; | |
220 | goto out; | |
221 | } | |
222 | ||
3caa2d8c AP |
223 | if (id >= kvm->arch.max_vcpus) { |
224 | err = -EINVAL; | |
225 | goto out; | |
226 | } | |
227 | ||
749cf76c CD |
228 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); |
229 | if (!vcpu) { | |
230 | err = -ENOMEM; | |
231 | goto out; | |
232 | } | |
233 | ||
234 | err = kvm_vcpu_init(vcpu, kvm, id); | |
235 | if (err) | |
236 | goto free_vcpu; | |
237 | ||
d5d8184d CD |
238 | err = create_hyp_mappings(vcpu, vcpu + 1); |
239 | if (err) | |
240 | goto vcpu_uninit; | |
241 | ||
749cf76c | 242 | return vcpu; |
d5d8184d CD |
243 | vcpu_uninit: |
244 | kvm_vcpu_uninit(vcpu); | |
749cf76c CD |
245 | free_vcpu: |
246 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
247 | out: | |
248 | return ERR_PTR(err); | |
249 | } | |
250 | ||
31928aa5 | 251 | void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) |
749cf76c | 252 | { |
6c3d63c9 | 253 | kvm_vgic_vcpu_early_init(vcpu); |
749cf76c CD |
254 | } |
255 | ||
256 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
257 | { | |
d5d8184d | 258 | kvm_mmu_free_memory_caches(vcpu); |
967f8427 | 259 | kvm_timer_vcpu_terminate(vcpu); |
c1bfb577 | 260 | kvm_vgic_vcpu_destroy(vcpu); |
d5d8184d | 261 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
749cf76c CD |
262 | } |
263 | ||
264 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
265 | { | |
266 | kvm_arch_vcpu_free(vcpu); | |
267 | } | |
268 | ||
269 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
270 | { | |
1a748478 | 271 | return kvm_timer_should_fire(vcpu); |
749cf76c CD |
272 | } |
273 | ||
d35268da CD |
274 | void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) |
275 | { | |
276 | kvm_timer_schedule(vcpu); | |
277 | } | |
278 | ||
279 | void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) | |
280 | { | |
281 | kvm_timer_unschedule(vcpu); | |
282 | } | |
283 | ||
749cf76c CD |
284 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) |
285 | { | |
f7ed45be CD |
286 | /* Force users to call KVM_ARM_VCPU_INIT */ |
287 | vcpu->arch.target = -1; | |
f7fa034d | 288 | bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); |
1a89dd91 | 289 | |
967f8427 MZ |
290 | /* Set up the timer */ |
291 | kvm_timer_vcpu_init(vcpu); | |
292 | ||
84e690bf AB |
293 | kvm_arm_reset_debug_ptr(vcpu); |
294 | ||
749cf76c CD |
295 | return 0; |
296 | } | |
297 | ||
749cf76c CD |
298 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
299 | { | |
86ce8535 | 300 | vcpu->cpu = cpu; |
3de50da6 | 301 | vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state); |
5b3e5e5b | 302 | |
1638a12d | 303 | kvm_arm_set_running_vcpu(vcpu); |
749cf76c CD |
304 | } |
305 | ||
306 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
307 | { | |
e9b152cb CD |
308 | /* |
309 | * The arch-generic KVM code expects the cpu field of a vcpu to be -1 | |
310 | * if the vcpu is no longer assigned to a cpu. This is used for the | |
311 | * optimized make_all_cpus_request path. | |
312 | */ | |
313 | vcpu->cpu = -1; | |
314 | ||
1638a12d | 315 | kvm_arm_set_running_vcpu(NULL); |
749cf76c CD |
316 | } |
317 | ||
749cf76c CD |
318 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, |
319 | struct kvm_mp_state *mp_state) | |
320 | { | |
3781528e | 321 | if (vcpu->arch.power_off) |
ecccf0cc AB |
322 | mp_state->mp_state = KVM_MP_STATE_STOPPED; |
323 | else | |
324 | mp_state->mp_state = KVM_MP_STATE_RUNNABLE; | |
325 | ||
326 | return 0; | |
749cf76c CD |
327 | } |
328 | ||
329 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
330 | struct kvm_mp_state *mp_state) | |
331 | { | |
ecccf0cc AB |
332 | switch (mp_state->mp_state) { |
333 | case KVM_MP_STATE_RUNNABLE: | |
3781528e | 334 | vcpu->arch.power_off = false; |
ecccf0cc AB |
335 | break; |
336 | case KVM_MP_STATE_STOPPED: | |
3781528e | 337 | vcpu->arch.power_off = true; |
ecccf0cc AB |
338 | break; |
339 | default: | |
340 | return -EINVAL; | |
341 | } | |
342 | ||
343 | return 0; | |
749cf76c CD |
344 | } |
345 | ||
5b3e5e5b CD |
346 | /** |
347 | * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled | |
348 | * @v: The VCPU pointer | |
349 | * | |
350 | * If the guest CPU is not waiting for interrupts or an interrupt line is | |
351 | * asserted, the CPU is by definition runnable. | |
352 | */ | |
749cf76c CD |
353 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) |
354 | { | |
4f5f1dc0 | 355 | return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v)) |
3b92830a | 356 | && !v->arch.power_off && !v->arch.pause); |
749cf76c CD |
357 | } |
358 | ||
f7ed45be CD |
359 | /* Just ensure a guest exit from a particular CPU */ |
360 | static void exit_vm_noop(void *info) | |
361 | { | |
362 | } | |
363 | ||
364 | void force_vm_exit(const cpumask_t *mask) | |
365 | { | |
366 | smp_call_function_many(mask, exit_vm_noop, NULL, true); | |
367 | } | |
368 | ||
369 | /** | |
370 | * need_new_vmid_gen - check that the VMID is still valid | |
371 | * @kvm: The VM's VMID to checkt | |
372 | * | |
373 | * return true if there is a new generation of VMIDs being used | |
374 | * | |
375 | * The hardware supports only 256 values with the value zero reserved for the | |
376 | * host, so we check if an assigned value belongs to a previous generation, | |
377 | * which which requires us to assign a new value. If we're the first to use a | |
378 | * VMID for the new generation, we must flush necessary caches and TLBs on all | |
379 | * CPUs. | |
380 | */ | |
381 | static bool need_new_vmid_gen(struct kvm *kvm) | |
382 | { | |
383 | return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); | |
384 | } | |
385 | ||
386 | /** | |
387 | * update_vttbr - Update the VTTBR with a valid VMID before the guest runs | |
388 | * @kvm The guest that we are about to run | |
389 | * | |
390 | * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the | |
391 | * VM has a valid VMID, otherwise assigns a new one and flushes corresponding | |
392 | * caches and TLBs. | |
393 | */ | |
394 | static void update_vttbr(struct kvm *kvm) | |
395 | { | |
396 | phys_addr_t pgd_phys; | |
397 | u64 vmid; | |
398 | ||
399 | if (!need_new_vmid_gen(kvm)) | |
400 | return; | |
401 | ||
402 | spin_lock(&kvm_vmid_lock); | |
403 | ||
404 | /* | |
405 | * We need to re-check the vmid_gen here to ensure that if another vcpu | |
406 | * already allocated a valid vmid for this vm, then this vcpu should | |
407 | * use the same vmid. | |
408 | */ | |
409 | if (!need_new_vmid_gen(kvm)) { | |
410 | spin_unlock(&kvm_vmid_lock); | |
411 | return; | |
412 | } | |
413 | ||
414 | /* First user of a new VMID generation? */ | |
415 | if (unlikely(kvm_next_vmid == 0)) { | |
416 | atomic64_inc(&kvm_vmid_gen); | |
417 | kvm_next_vmid = 1; | |
418 | ||
419 | /* | |
420 | * On SMP we know no other CPUs can use this CPU's or each | |
421 | * other's VMID after force_vm_exit returns since the | |
422 | * kvm_vmid_lock blocks them from reentry to the guest. | |
423 | */ | |
424 | force_vm_exit(cpu_all_mask); | |
425 | /* | |
426 | * Now broadcast TLB + ICACHE invalidation over the inner | |
427 | * shareable domain to make sure all data structures are | |
428 | * clean. | |
429 | */ | |
430 | kvm_call_hyp(__kvm_flush_vm_context); | |
431 | } | |
432 | ||
433 | kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); | |
434 | kvm->arch.vmid = kvm_next_vmid; | |
435 | kvm_next_vmid++; | |
436 | ||
437 | /* update vttbr to be used with the new vmid */ | |
38f791a4 | 438 | pgd_phys = virt_to_phys(kvm_get_hwpgd(kvm)); |
dbff124e | 439 | BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK); |
f7ed45be | 440 | vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK; |
dbff124e | 441 | kvm->arch.vttbr = pgd_phys | vmid; |
f7ed45be CD |
442 | |
443 | spin_unlock(&kvm_vmid_lock); | |
444 | } | |
445 | ||
f7ed45be CD |
446 | static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) |
447 | { | |
05971120 | 448 | struct kvm *kvm = vcpu->kvm; |
e1ba0207 CD |
449 | int ret; |
450 | ||
f7ed45be CD |
451 | if (likely(vcpu->arch.has_run_once)) |
452 | return 0; | |
453 | ||
454 | vcpu->arch.has_run_once = true; | |
aa024c2f | 455 | |
01ac5e34 | 456 | /* |
6d3cfbe2 PM |
457 | * Map the VGIC hardware resources before running a vcpu the first |
458 | * time on this VM. | |
01ac5e34 | 459 | */ |
c2f58514 | 460 | if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) { |
05971120 | 461 | ret = kvm_vgic_map_resources(kvm); |
01ac5e34 MZ |
462 | if (ret) |
463 | return ret; | |
464 | } | |
465 | ||
05971120 CD |
466 | /* |
467 | * Enable the arch timers only if we have an in-kernel VGIC | |
468 | * and it has been properly initialized, since we cannot handle | |
469 | * interrupts from the virtual timer with a userspace gic. | |
470 | */ | |
471 | if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) | |
472 | kvm_timer_enable(kvm); | |
473 | ||
f7ed45be CD |
474 | return 0; |
475 | } | |
476 | ||
c1426e4c EA |
477 | bool kvm_arch_intc_initialized(struct kvm *kvm) |
478 | { | |
479 | return vgic_initialized(kvm); | |
480 | } | |
481 | ||
3b92830a EA |
482 | static void kvm_arm_halt_guest(struct kvm *kvm) __maybe_unused; |
483 | static void kvm_arm_resume_guest(struct kvm *kvm) __maybe_unused; | |
484 | ||
485 | static void kvm_arm_halt_guest(struct kvm *kvm) | |
486 | { | |
487 | int i; | |
488 | struct kvm_vcpu *vcpu; | |
489 | ||
490 | kvm_for_each_vcpu(i, vcpu, kvm) | |
491 | vcpu->arch.pause = true; | |
492 | force_vm_exit(cpu_all_mask); | |
493 | } | |
494 | ||
495 | static void kvm_arm_resume_guest(struct kvm *kvm) | |
496 | { | |
497 | int i; | |
498 | struct kvm_vcpu *vcpu; | |
499 | ||
500 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
501 | wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); | |
502 | ||
503 | vcpu->arch.pause = false; | |
504 | wake_up_interruptible(wq); | |
505 | } | |
506 | } | |
507 | ||
3781528e | 508 | static void vcpu_sleep(struct kvm_vcpu *vcpu) |
aa024c2f MZ |
509 | { |
510 | wait_queue_head_t *wq = kvm_arch_vcpu_wq(vcpu); | |
511 | ||
3b92830a EA |
512 | wait_event_interruptible(*wq, ((!vcpu->arch.power_off) && |
513 | (!vcpu->arch.pause))); | |
aa024c2f MZ |
514 | } |
515 | ||
e8180dca AP |
516 | static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) |
517 | { | |
518 | return vcpu->arch.target >= 0; | |
519 | } | |
520 | ||
f7ed45be CD |
521 | /** |
522 | * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code | |
523 | * @vcpu: The VCPU pointer | |
524 | * @run: The kvm_run structure pointer used for userspace state exchange | |
525 | * | |
526 | * This function is called through the VCPU_RUN ioctl called from user space. It | |
527 | * will execute VM code in a loop until the time slice for the process is used | |
528 | * or some emulation is needed from user space in which case the function will | |
529 | * return with return value 0 and with the kvm_run structure filled in with the | |
530 | * required data for the requested emulation. | |
531 | */ | |
749cf76c CD |
532 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) |
533 | { | |
f7ed45be CD |
534 | int ret; |
535 | sigset_t sigsaved; | |
536 | ||
e8180dca | 537 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
f7ed45be CD |
538 | return -ENOEXEC; |
539 | ||
540 | ret = kvm_vcpu_first_run_init(vcpu); | |
541 | if (ret) | |
542 | return ret; | |
543 | ||
45e96ea6 CD |
544 | if (run->exit_reason == KVM_EXIT_MMIO) { |
545 | ret = kvm_handle_mmio_return(vcpu, vcpu->run); | |
546 | if (ret) | |
547 | return ret; | |
548 | } | |
549 | ||
f7ed45be CD |
550 | if (vcpu->sigset_active) |
551 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
552 | ||
553 | ret = 1; | |
554 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
555 | while (ret > 0) { | |
556 | /* | |
557 | * Check conditions before entering the guest | |
558 | */ | |
559 | cond_resched(); | |
560 | ||
561 | update_vttbr(vcpu->kvm); | |
562 | ||
3b92830a | 563 | if (vcpu->arch.power_off || vcpu->arch.pause) |
3781528e | 564 | vcpu_sleep(vcpu); |
aa024c2f | 565 | |
abdf5843 MZ |
566 | /* |
567 | * Preparing the interrupts to be injected also | |
568 | * involves poking the GIC, which must be done in a | |
569 | * non-preemptible context. | |
570 | */ | |
1b3d546d | 571 | preempt_disable(); |
7e16aa81 | 572 | kvm_timer_flush_hwstate(vcpu); |
abdf5843 MZ |
573 | kvm_vgic_flush_hwstate(vcpu); |
574 | ||
f7ed45be CD |
575 | local_irq_disable(); |
576 | ||
577 | /* | |
578 | * Re-check atomic conditions | |
579 | */ | |
580 | if (signal_pending(current)) { | |
581 | ret = -EINTR; | |
582 | run->exit_reason = KVM_EXIT_INTR; | |
583 | } | |
584 | ||
101d3da0 | 585 | if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) || |
3b92830a | 586 | vcpu->arch.power_off || vcpu->arch.pause) { |
f7ed45be | 587 | local_irq_enable(); |
4b4b4512 | 588 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 | 589 | kvm_vgic_sync_hwstate(vcpu); |
abdf5843 | 590 | preempt_enable(); |
f7ed45be CD |
591 | continue; |
592 | } | |
593 | ||
56c7f5e7 AB |
594 | kvm_arm_setup_debug(vcpu); |
595 | ||
f7ed45be CD |
596 | /************************************************************** |
597 | * Enter the guest | |
598 | */ | |
599 | trace_kvm_entry(*vcpu_pc(vcpu)); | |
ccf73aaf | 600 | __kvm_guest_enter(); |
f7ed45be CD |
601 | vcpu->mode = IN_GUEST_MODE; |
602 | ||
603 | ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); | |
604 | ||
605 | vcpu->mode = OUTSIDE_GUEST_MODE; | |
1b3d546d CD |
606 | /* |
607 | * Back from guest | |
608 | *************************************************************/ | |
609 | ||
56c7f5e7 AB |
610 | kvm_arm_clear_debug(vcpu); |
611 | ||
f7ed45be CD |
612 | /* |
613 | * We may have taken a host interrupt in HYP mode (ie | |
614 | * while executing the guest). This interrupt is still | |
615 | * pending, as we haven't serviced it yet! | |
616 | * | |
617 | * We're now back in SVC mode, with interrupts | |
618 | * disabled. Enabling the interrupts now will have | |
619 | * the effect of taking the interrupt again, in SVC | |
620 | * mode this time. | |
621 | */ | |
622 | local_irq_enable(); | |
623 | ||
624 | /* | |
1b3d546d CD |
625 | * We do local_irq_enable() before calling kvm_guest_exit() so |
626 | * that if a timer interrupt hits while running the guest we | |
627 | * account that tick as being spent in the guest. We enable | |
628 | * preemption after calling kvm_guest_exit() so that if we get | |
629 | * preempted we make sure ticks after that is not counted as | |
630 | * guest time. | |
631 | */ | |
632 | kvm_guest_exit(); | |
b5905dc1 | 633 | trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu)); |
1b3d546d | 634 | |
4b4b4512 CD |
635 | /* |
636 | * We must sync the timer state before the vgic state so that | |
637 | * the vgic can properly sample the updated state of the | |
638 | * interrupt line. | |
639 | */ | |
640 | kvm_timer_sync_hwstate(vcpu); | |
641 | ||
1a89dd91 | 642 | kvm_vgic_sync_hwstate(vcpu); |
abdf5843 MZ |
643 | |
644 | preempt_enable(); | |
645 | ||
f7ed45be CD |
646 | ret = handle_exit(vcpu, run, ret); |
647 | } | |
648 | ||
649 | if (vcpu->sigset_active) | |
650 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
651 | return ret; | |
749cf76c CD |
652 | } |
653 | ||
86ce8535 CD |
654 | static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) |
655 | { | |
656 | int bit_index; | |
657 | bool set; | |
658 | unsigned long *ptr; | |
659 | ||
660 | if (number == KVM_ARM_IRQ_CPU_IRQ) | |
661 | bit_index = __ffs(HCR_VI); | |
662 | else /* KVM_ARM_IRQ_CPU_FIQ */ | |
663 | bit_index = __ffs(HCR_VF); | |
664 | ||
665 | ptr = (unsigned long *)&vcpu->arch.irq_lines; | |
666 | if (level) | |
667 | set = test_and_set_bit(bit_index, ptr); | |
668 | else | |
669 | set = test_and_clear_bit(bit_index, ptr); | |
670 | ||
671 | /* | |
672 | * If we didn't change anything, no need to wake up or kick other CPUs | |
673 | */ | |
674 | if (set == level) | |
675 | return 0; | |
676 | ||
677 | /* | |
678 | * The vcpu irq_lines field was updated, wake up sleeping VCPUs and | |
679 | * trigger a world-switch round on the running physical CPU to set the | |
680 | * virtual IRQ/FIQ fields in the HCR appropriately. | |
681 | */ | |
682 | kvm_vcpu_kick(vcpu); | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
79558f11 AG |
687 | int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, |
688 | bool line_status) | |
86ce8535 CD |
689 | { |
690 | u32 irq = irq_level->irq; | |
691 | unsigned int irq_type, vcpu_idx, irq_num; | |
692 | int nrcpus = atomic_read(&kvm->online_vcpus); | |
693 | struct kvm_vcpu *vcpu = NULL; | |
694 | bool level = irq_level->level; | |
695 | ||
696 | irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; | |
697 | vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; | |
698 | irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; | |
699 | ||
700 | trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); | |
701 | ||
5863c2ce MZ |
702 | switch (irq_type) { |
703 | case KVM_ARM_IRQ_TYPE_CPU: | |
704 | if (irqchip_in_kernel(kvm)) | |
705 | return -ENXIO; | |
86ce8535 | 706 | |
5863c2ce MZ |
707 | if (vcpu_idx >= nrcpus) |
708 | return -EINVAL; | |
86ce8535 | 709 | |
5863c2ce MZ |
710 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); |
711 | if (!vcpu) | |
712 | return -EINVAL; | |
86ce8535 | 713 | |
5863c2ce MZ |
714 | if (irq_num > KVM_ARM_IRQ_CPU_FIQ) |
715 | return -EINVAL; | |
716 | ||
717 | return vcpu_interrupt_line(vcpu, irq_num, level); | |
718 | case KVM_ARM_IRQ_TYPE_PPI: | |
719 | if (!irqchip_in_kernel(kvm)) | |
720 | return -ENXIO; | |
721 | ||
722 | if (vcpu_idx >= nrcpus) | |
723 | return -EINVAL; | |
724 | ||
725 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); | |
726 | if (!vcpu) | |
727 | return -EINVAL; | |
728 | ||
729 | if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) | |
730 | return -EINVAL; | |
86ce8535 | 731 | |
5863c2ce MZ |
732 | return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); |
733 | case KVM_ARM_IRQ_TYPE_SPI: | |
734 | if (!irqchip_in_kernel(kvm)) | |
735 | return -ENXIO; | |
736 | ||
fd1d0ddf | 737 | if (irq_num < VGIC_NR_PRIVATE_IRQS) |
5863c2ce MZ |
738 | return -EINVAL; |
739 | ||
740 | return kvm_vgic_inject_irq(kvm, 0, irq_num, level); | |
741 | } | |
742 | ||
743 | return -EINVAL; | |
86ce8535 CD |
744 | } |
745 | ||
f7fa034d CD |
746 | static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, |
747 | const struct kvm_vcpu_init *init) | |
748 | { | |
749 | unsigned int i; | |
750 | int phys_target = kvm_target_cpu(); | |
751 | ||
752 | if (init->target != phys_target) | |
753 | return -EINVAL; | |
754 | ||
755 | /* | |
756 | * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must | |
757 | * use the same target. | |
758 | */ | |
759 | if (vcpu->arch.target != -1 && vcpu->arch.target != init->target) | |
760 | return -EINVAL; | |
761 | ||
762 | /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ | |
763 | for (i = 0; i < sizeof(init->features) * 8; i++) { | |
764 | bool set = (init->features[i / 32] & (1 << (i % 32))); | |
765 | ||
766 | if (set && i >= KVM_VCPU_MAX_FEATURES) | |
767 | return -ENOENT; | |
768 | ||
769 | /* | |
770 | * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must | |
771 | * use the same feature set. | |
772 | */ | |
773 | if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES && | |
774 | test_bit(i, vcpu->arch.features) != set) | |
775 | return -EINVAL; | |
776 | ||
777 | if (set) | |
778 | set_bit(i, vcpu->arch.features); | |
779 | } | |
780 | ||
781 | vcpu->arch.target = phys_target; | |
782 | ||
783 | /* Now we know what it is, we can reset it. */ | |
784 | return kvm_reset_vcpu(vcpu); | |
785 | } | |
786 | ||
787 | ||
478a8237 CD |
788 | static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, |
789 | struct kvm_vcpu_init *init) | |
790 | { | |
791 | int ret; | |
792 | ||
793 | ret = kvm_vcpu_set_target(vcpu, init); | |
794 | if (ret) | |
795 | return ret; | |
796 | ||
957db105 CD |
797 | /* |
798 | * Ensure a rebooted VM will fault in RAM pages and detect if the | |
799 | * guest MMU is turned off and flush the caches as needed. | |
800 | */ | |
801 | if (vcpu->arch.has_run_once) | |
802 | stage2_unmap_vm(vcpu->kvm); | |
803 | ||
b856a591 CD |
804 | vcpu_reset_hcr(vcpu); |
805 | ||
478a8237 | 806 | /* |
3781528e | 807 | * Handle the "start in power-off" case. |
478a8237 | 808 | */ |
03f1d4c1 | 809 | if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) |
3781528e | 810 | vcpu->arch.power_off = true; |
3ad8b3de | 811 | else |
3781528e | 812 | vcpu->arch.power_off = false; |
478a8237 CD |
813 | |
814 | return 0; | |
815 | } | |
816 | ||
749cf76c CD |
817 | long kvm_arch_vcpu_ioctl(struct file *filp, |
818 | unsigned int ioctl, unsigned long arg) | |
819 | { | |
820 | struct kvm_vcpu *vcpu = filp->private_data; | |
821 | void __user *argp = (void __user *)arg; | |
822 | ||
823 | switch (ioctl) { | |
824 | case KVM_ARM_VCPU_INIT: { | |
825 | struct kvm_vcpu_init init; | |
826 | ||
827 | if (copy_from_user(&init, argp, sizeof(init))) | |
828 | return -EFAULT; | |
829 | ||
478a8237 | 830 | return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); |
749cf76c CD |
831 | } |
832 | case KVM_SET_ONE_REG: | |
833 | case KVM_GET_ONE_REG: { | |
834 | struct kvm_one_reg reg; | |
e8180dca AP |
835 | |
836 | if (unlikely(!kvm_vcpu_initialized(vcpu))) | |
837 | return -ENOEXEC; | |
838 | ||
749cf76c CD |
839 | if (copy_from_user(®, argp, sizeof(reg))) |
840 | return -EFAULT; | |
841 | if (ioctl == KVM_SET_ONE_REG) | |
842 | return kvm_arm_set_reg(vcpu, ®); | |
843 | else | |
844 | return kvm_arm_get_reg(vcpu, ®); | |
845 | } | |
846 | case KVM_GET_REG_LIST: { | |
847 | struct kvm_reg_list __user *user_list = argp; | |
848 | struct kvm_reg_list reg_list; | |
849 | unsigned n; | |
850 | ||
e8180dca AP |
851 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
852 | return -ENOEXEC; | |
853 | ||
749cf76c CD |
854 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) |
855 | return -EFAULT; | |
856 | n = reg_list.n; | |
857 | reg_list.n = kvm_arm_num_regs(vcpu); | |
858 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) | |
859 | return -EFAULT; | |
860 | if (n < reg_list.n) | |
861 | return -E2BIG; | |
862 | return kvm_arm_copy_reg_indices(vcpu, user_list->reg); | |
863 | } | |
864 | default: | |
865 | return -EINVAL; | |
866 | } | |
867 | } | |
868 | ||
53c810c3 MS |
869 | /** |
870 | * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot | |
871 | * @kvm: kvm instance | |
872 | * @log: slot id and address to which we copy the log | |
873 | * | |
874 | * Steps 1-4 below provide general overview of dirty page logging. See | |
875 | * kvm_get_dirty_log_protect() function description for additional details. | |
876 | * | |
877 | * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we | |
878 | * always flush the TLB (step 4) even if previous step failed and the dirty | |
879 | * bitmap may be corrupt. Regardless of previous outcome the KVM logging API | |
880 | * does not preclude user space subsequent dirty log read. Flushing TLB ensures | |
881 | * writes will be marked dirty for next log read. | |
882 | * | |
883 | * 1. Take a snapshot of the bit and clear it if needed. | |
884 | * 2. Write protect the corresponding page. | |
885 | * 3. Copy the snapshot to the userspace. | |
886 | * 4. Flush TLB's if needed. | |
887 | */ | |
749cf76c CD |
888 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) |
889 | { | |
53c810c3 MS |
890 | bool is_dirty = false; |
891 | int r; | |
892 | ||
893 | mutex_lock(&kvm->slots_lock); | |
894 | ||
895 | r = kvm_get_dirty_log_protect(kvm, log, &is_dirty); | |
896 | ||
897 | if (is_dirty) | |
898 | kvm_flush_remote_tlbs(kvm); | |
899 | ||
900 | mutex_unlock(&kvm->slots_lock); | |
901 | return r; | |
749cf76c CD |
902 | } |
903 | ||
3401d546 CD |
904 | static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, |
905 | struct kvm_arm_device_addr *dev_addr) | |
906 | { | |
330690cd CD |
907 | unsigned long dev_id, type; |
908 | ||
909 | dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> | |
910 | KVM_ARM_DEVICE_ID_SHIFT; | |
911 | type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> | |
912 | KVM_ARM_DEVICE_TYPE_SHIFT; | |
913 | ||
914 | switch (dev_id) { | |
915 | case KVM_ARM_DEVICE_VGIC_V2: | |
ce01e4e8 | 916 | return kvm_vgic_addr(kvm, type, &dev_addr->addr, true); |
330690cd CD |
917 | default: |
918 | return -ENODEV; | |
919 | } | |
3401d546 CD |
920 | } |
921 | ||
749cf76c CD |
922 | long kvm_arch_vm_ioctl(struct file *filp, |
923 | unsigned int ioctl, unsigned long arg) | |
924 | { | |
3401d546 CD |
925 | struct kvm *kvm = filp->private_data; |
926 | void __user *argp = (void __user *)arg; | |
927 | ||
928 | switch (ioctl) { | |
5863c2ce | 929 | case KVM_CREATE_IRQCHIP: { |
69ff5c61 | 930 | return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2); |
5863c2ce | 931 | } |
3401d546 CD |
932 | case KVM_ARM_SET_DEVICE_ADDR: { |
933 | struct kvm_arm_device_addr dev_addr; | |
934 | ||
935 | if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) | |
936 | return -EFAULT; | |
937 | return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); | |
938 | } | |
42c4e0c7 AP |
939 | case KVM_ARM_PREFERRED_TARGET: { |
940 | int err; | |
941 | struct kvm_vcpu_init init; | |
942 | ||
943 | err = kvm_vcpu_preferred_target(&init); | |
944 | if (err) | |
945 | return err; | |
946 | ||
947 | if (copy_to_user(argp, &init, sizeof(init))) | |
948 | return -EFAULT; | |
949 | ||
950 | return 0; | |
951 | } | |
3401d546 CD |
952 | default: |
953 | return -EINVAL; | |
954 | } | |
749cf76c CD |
955 | } |
956 | ||
d157f4a5 | 957 | static void cpu_init_hyp_mode(void *dummy) |
342cd0ab | 958 | { |
dac288f7 MZ |
959 | phys_addr_t boot_pgd_ptr; |
960 | phys_addr_t pgd_ptr; | |
342cd0ab CD |
961 | unsigned long hyp_stack_ptr; |
962 | unsigned long stack_page; | |
963 | unsigned long vector_ptr; | |
964 | ||
965 | /* Switch from the HYP stub to our own HYP init vector */ | |
5a677ce0 | 966 | __hyp_set_vectors(kvm_get_idmap_vector()); |
342cd0ab | 967 | |
dac288f7 MZ |
968 | boot_pgd_ptr = kvm_mmu_get_boot_httbr(); |
969 | pgd_ptr = kvm_mmu_get_httbr(); | |
1436c1aa | 970 | stack_page = __this_cpu_read(kvm_arm_hyp_stack_page); |
342cd0ab CD |
971 | hyp_stack_ptr = stack_page + PAGE_SIZE; |
972 | vector_ptr = (unsigned long)__kvm_hyp_vector; | |
973 | ||
5a677ce0 | 974 | __cpu_init_hyp_mode(boot_pgd_ptr, pgd_ptr, hyp_stack_ptr, vector_ptr); |
56c7f5e7 AB |
975 | |
976 | kvm_arm_init_debug(); | |
342cd0ab CD |
977 | } |
978 | ||
d157f4a5 MZ |
979 | static int hyp_init_cpu_notify(struct notifier_block *self, |
980 | unsigned long action, void *cpu) | |
981 | { | |
982 | switch (action) { | |
983 | case CPU_STARTING: | |
984 | case CPU_STARTING_FROZEN: | |
37a34ac1 VM |
985 | if (__hyp_get_vectors() == hyp_default_vectors) |
986 | cpu_init_hyp_mode(NULL); | |
d157f4a5 MZ |
987 | break; |
988 | } | |
989 | ||
990 | return NOTIFY_OK; | |
342cd0ab CD |
991 | } |
992 | ||
d157f4a5 MZ |
993 | static struct notifier_block hyp_init_cpu_nb = { |
994 | .notifier_call = hyp_init_cpu_notify, | |
995 | }; | |
996 | ||
1fcf7ce0 LP |
997 | #ifdef CONFIG_CPU_PM |
998 | static int hyp_init_cpu_pm_notifier(struct notifier_block *self, | |
999 | unsigned long cmd, | |
1000 | void *v) | |
1001 | { | |
b20c9f29 MZ |
1002 | if (cmd == CPU_PM_EXIT && |
1003 | __hyp_get_vectors() == hyp_default_vectors) { | |
1fcf7ce0 LP |
1004 | cpu_init_hyp_mode(NULL); |
1005 | return NOTIFY_OK; | |
1006 | } | |
1007 | ||
1008 | return NOTIFY_DONE; | |
1009 | } | |
1010 | ||
1011 | static struct notifier_block hyp_init_cpu_pm_nb = { | |
1012 | .notifier_call = hyp_init_cpu_pm_notifier, | |
1013 | }; | |
1014 | ||
1015 | static void __init hyp_cpu_pm_init(void) | |
1016 | { | |
1017 | cpu_pm_register_notifier(&hyp_init_cpu_pm_nb); | |
1018 | } | |
1019 | #else | |
1020 | static inline void hyp_cpu_pm_init(void) | |
1021 | { | |
1022 | } | |
1023 | #endif | |
1024 | ||
342cd0ab CD |
1025 | /** |
1026 | * Inits Hyp-mode on all online CPUs | |
1027 | */ | |
1028 | static int init_hyp_mode(void) | |
1029 | { | |
342cd0ab CD |
1030 | int cpu; |
1031 | int err = 0; | |
1032 | ||
1033 | /* | |
1034 | * Allocate Hyp PGD and setup Hyp identity mapping | |
1035 | */ | |
1036 | err = kvm_mmu_init(); | |
1037 | if (err) | |
1038 | goto out_err; | |
1039 | ||
1040 | /* | |
1041 | * It is probably enough to obtain the default on one | |
1042 | * CPU. It's unlikely to be different on the others. | |
1043 | */ | |
1044 | hyp_default_vectors = __hyp_get_vectors(); | |
1045 | ||
1046 | /* | |
1047 | * Allocate stack pages for Hypervisor-mode | |
1048 | */ | |
1049 | for_each_possible_cpu(cpu) { | |
1050 | unsigned long stack_page; | |
1051 | ||
1052 | stack_page = __get_free_page(GFP_KERNEL); | |
1053 | if (!stack_page) { | |
1054 | err = -ENOMEM; | |
1055 | goto out_free_stack_pages; | |
1056 | } | |
1057 | ||
1058 | per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; | |
1059 | } | |
1060 | ||
342cd0ab CD |
1061 | /* |
1062 | * Map the Hyp-code called directly from the host | |
1063 | */ | |
1064 | err = create_hyp_mappings(__kvm_hyp_code_start, __kvm_hyp_code_end); | |
1065 | if (err) { | |
1066 | kvm_err("Cannot map world-switch code\n"); | |
1067 | goto out_free_mappings; | |
1068 | } | |
1069 | ||
1070 | /* | |
1071 | * Map the Hyp stack pages | |
1072 | */ | |
1073 | for_each_possible_cpu(cpu) { | |
1074 | char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); | |
1075 | err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE); | |
1076 | ||
1077 | if (err) { | |
1078 | kvm_err("Cannot map hyp stack\n"); | |
1079 | goto out_free_mappings; | |
1080 | } | |
1081 | } | |
1082 | ||
1083 | /* | |
3de50da6 | 1084 | * Map the host CPU structures |
342cd0ab | 1085 | */ |
3de50da6 MZ |
1086 | kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t); |
1087 | if (!kvm_host_cpu_state) { | |
342cd0ab | 1088 | err = -ENOMEM; |
3de50da6 | 1089 | kvm_err("Cannot allocate host CPU state\n"); |
342cd0ab CD |
1090 | goto out_free_mappings; |
1091 | } | |
1092 | ||
1093 | for_each_possible_cpu(cpu) { | |
3de50da6 | 1094 | kvm_cpu_context_t *cpu_ctxt; |
342cd0ab | 1095 | |
3de50da6 MZ |
1096 | cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu); |
1097 | err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1); | |
342cd0ab CD |
1098 | |
1099 | if (err) { | |
3de50da6 MZ |
1100 | kvm_err("Cannot map host CPU state: %d\n", err); |
1101 | goto out_free_context; | |
342cd0ab CD |
1102 | } |
1103 | } | |
1104 | ||
d157f4a5 MZ |
1105 | /* |
1106 | * Execute the init code on each CPU. | |
1107 | */ | |
1108 | on_each_cpu(cpu_init_hyp_mode, NULL, 1); | |
1109 | ||
1a89dd91 MZ |
1110 | /* |
1111 | * Init HYP view of VGIC | |
1112 | */ | |
1113 | err = kvm_vgic_hyp_init(); | |
1114 | if (err) | |
3de50da6 | 1115 | goto out_free_context; |
1a89dd91 | 1116 | |
967f8427 MZ |
1117 | /* |
1118 | * Init HYP architected timer support | |
1119 | */ | |
1120 | err = kvm_timer_hyp_init(); | |
1121 | if (err) | |
399ea0f6 | 1122 | goto out_free_context; |
967f8427 | 1123 | |
d157f4a5 MZ |
1124 | #ifndef CONFIG_HOTPLUG_CPU |
1125 | free_boot_hyp_pgd(); | |
1126 | #endif | |
1127 | ||
210552c1 MZ |
1128 | kvm_perf_init(); |
1129 | ||
342cd0ab | 1130 | kvm_info("Hyp mode initialized successfully\n"); |
210552c1 | 1131 | |
342cd0ab | 1132 | return 0; |
3de50da6 MZ |
1133 | out_free_context: |
1134 | free_percpu(kvm_host_cpu_state); | |
342cd0ab | 1135 | out_free_mappings: |
4f728276 | 1136 | free_hyp_pgds(); |
342cd0ab CD |
1137 | out_free_stack_pages: |
1138 | for_each_possible_cpu(cpu) | |
1139 | free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); | |
1140 | out_err: | |
1141 | kvm_err("error initializing Hyp mode: %d\n", err); | |
1142 | return err; | |
1143 | } | |
1144 | ||
d4e071ce AP |
1145 | static void check_kvm_target_cpu(void *ret) |
1146 | { | |
1147 | *(int *)ret = kvm_target_cpu(); | |
1148 | } | |
1149 | ||
4429fc64 AP |
1150 | struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr) |
1151 | { | |
1152 | struct kvm_vcpu *vcpu; | |
1153 | int i; | |
1154 | ||
1155 | mpidr &= MPIDR_HWID_BITMASK; | |
1156 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1157 | if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu)) | |
1158 | return vcpu; | |
1159 | } | |
1160 | return NULL; | |
1161 | } | |
1162 | ||
342cd0ab CD |
1163 | /** |
1164 | * Initialize Hyp-mode and memory mappings on all CPUs. | |
1165 | */ | |
749cf76c CD |
1166 | int kvm_arch_init(void *opaque) |
1167 | { | |
342cd0ab | 1168 | int err; |
d4e071ce | 1169 | int ret, cpu; |
342cd0ab CD |
1170 | |
1171 | if (!is_hyp_mode_available()) { | |
1172 | kvm_err("HYP mode not available\n"); | |
1173 | return -ENODEV; | |
1174 | } | |
1175 | ||
d4e071ce AP |
1176 | for_each_online_cpu(cpu) { |
1177 | smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1); | |
1178 | if (ret < 0) { | |
1179 | kvm_err("Error, CPU %d not supported!\n", cpu); | |
1180 | return -ENODEV; | |
1181 | } | |
342cd0ab CD |
1182 | } |
1183 | ||
8146875d SB |
1184 | cpu_notifier_register_begin(); |
1185 | ||
342cd0ab CD |
1186 | err = init_hyp_mode(); |
1187 | if (err) | |
1188 | goto out_err; | |
1189 | ||
8146875d | 1190 | err = __register_cpu_notifier(&hyp_init_cpu_nb); |
d157f4a5 MZ |
1191 | if (err) { |
1192 | kvm_err("Cannot register HYP init CPU notifier (%d)\n", err); | |
1193 | goto out_err; | |
1194 | } | |
1195 | ||
8146875d SB |
1196 | cpu_notifier_register_done(); |
1197 | ||
1fcf7ce0 LP |
1198 | hyp_cpu_pm_init(); |
1199 | ||
5b3e5e5b | 1200 | kvm_coproc_table_init(); |
749cf76c | 1201 | return 0; |
342cd0ab | 1202 | out_err: |
8146875d | 1203 | cpu_notifier_register_done(); |
342cd0ab | 1204 | return err; |
749cf76c CD |
1205 | } |
1206 | ||
1207 | /* NOP: Compiling as a module not supported */ | |
1208 | void kvm_arch_exit(void) | |
1209 | { | |
210552c1 | 1210 | kvm_perf_teardown(); |
749cf76c CD |
1211 | } |
1212 | ||
1213 | static int arm_init(void) | |
1214 | { | |
1215 | int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); | |
1216 | return rc; | |
1217 | } | |
1218 | ||
1219 | module_init(arm_init); |