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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 | ||
1fcf7ce0 | 19 | #include <linux/cpu_pm.h> |
749cf76c CD |
20 | #include <linux/errno.h> |
21 | #include <linux/err.h> | |
22 | #include <linux/kvm_host.h> | |
1085fdc6 | 23 | #include <linux/list.h> |
749cf76c CD |
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 | 30 | #include <trace/events/kvm.h> |
b02386eb | 31 | #include <kvm/arm_pmu.h> |
749cf76c CD |
32 | |
33 | #define CREATE_TRACE_POINTS | |
34 | #include "trace.h" | |
35 | ||
749cf76c CD |
36 | #include <asm/uaccess.h> |
37 | #include <asm/ptrace.h> | |
38 | #include <asm/mman.h> | |
342cd0ab | 39 | #include <asm/tlbflush.h> |
5b3e5e5b | 40 | #include <asm/cacheflush.h> |
342cd0ab CD |
41 | #include <asm/virt.h> |
42 | #include <asm/kvm_arm.h> | |
43 | #include <asm/kvm_asm.h> | |
44 | #include <asm/kvm_mmu.h> | |
f7ed45be | 45 | #include <asm/kvm_emulate.h> |
5b3e5e5b | 46 | #include <asm/kvm_coproc.h> |
aa024c2f | 47 | #include <asm/kvm_psci.h> |
910917bb | 48 | #include <asm/sections.h> |
749cf76c CD |
49 | |
50 | #ifdef REQUIRES_VIRT | |
51 | __asm__(".arch_extension virt"); | |
52 | #endif | |
53 | ||
342cd0ab | 54 | static DEFINE_PER_CPU(unsigned long, kvm_arm_hyp_stack_page); |
3de50da6 | 55 | static kvm_cpu_context_t __percpu *kvm_host_cpu_state; |
342cd0ab CD |
56 | static unsigned long hyp_default_vectors; |
57 | ||
1638a12d MZ |
58 | /* Per-CPU variable containing the currently running vcpu. */ |
59 | static DEFINE_PER_CPU(struct kvm_vcpu *, kvm_arm_running_vcpu); | |
60 | ||
f7ed45be CD |
61 | /* The VMID used in the VTTBR */ |
62 | static atomic64_t kvm_vmid_gen = ATOMIC64_INIT(1); | |
20475f78 VM |
63 | static u32 kvm_next_vmid; |
64 | static unsigned int kvm_vmid_bits __read_mostly; | |
f7ed45be | 65 | static DEFINE_SPINLOCK(kvm_vmid_lock); |
342cd0ab | 66 | |
c7da6fa4 PF |
67 | static bool vgic_present; |
68 | ||
67f69197 AT |
69 | static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled); |
70 | ||
1638a12d MZ |
71 | static void kvm_arm_set_running_vcpu(struct kvm_vcpu *vcpu) |
72 | { | |
73 | BUG_ON(preemptible()); | |
1436c1aa | 74 | __this_cpu_write(kvm_arm_running_vcpu, vcpu); |
1638a12d MZ |
75 | } |
76 | ||
77 | /** | |
78 | * kvm_arm_get_running_vcpu - get the vcpu running on the current CPU. | |
79 | * Must be called from non-preemptible context | |
80 | */ | |
81 | struct kvm_vcpu *kvm_arm_get_running_vcpu(void) | |
82 | { | |
83 | BUG_ON(preemptible()); | |
1436c1aa | 84 | return __this_cpu_read(kvm_arm_running_vcpu); |
1638a12d MZ |
85 | } |
86 | ||
87 | /** | |
88 | * kvm_arm_get_running_vcpus - get the per-CPU array of currently running vcpus. | |
89 | */ | |
4000be42 | 90 | struct kvm_vcpu * __percpu *kvm_get_running_vcpus(void) |
1638a12d MZ |
91 | { |
92 | return &kvm_arm_running_vcpu; | |
93 | } | |
94 | ||
749cf76c CD |
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 | ||
749cf76c CD |
100 | int kvm_arch_hardware_setup(void) |
101 | { | |
102 | return 0; | |
103 | } | |
104 | ||
749cf76c CD |
105 | void kvm_arch_check_processor_compat(void *rtn) |
106 | { | |
107 | *(int *)rtn = 0; | |
108 | } | |
109 | ||
749cf76c | 110 | |
d5d8184d CD |
111 | /** |
112 | * kvm_arch_init_vm - initializes a VM data structure | |
113 | * @kvm: pointer to the KVM struct | |
114 | */ | |
749cf76c CD |
115 | int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) |
116 | { | |
d5d8184d CD |
117 | int ret = 0; |
118 | ||
749cf76c CD |
119 | if (type) |
120 | return -EINVAL; | |
121 | ||
d5d8184d CD |
122 | ret = kvm_alloc_stage2_pgd(kvm); |
123 | if (ret) | |
124 | goto out_fail_alloc; | |
125 | ||
c8dddecd | 126 | ret = create_hyp_mappings(kvm, kvm + 1, PAGE_HYP); |
d5d8184d CD |
127 | if (ret) |
128 | goto out_free_stage2_pgd; | |
129 | ||
6c3d63c9 | 130 | kvm_vgic_early_init(kvm); |
a1a64387 CD |
131 | kvm_timer_init(kvm); |
132 | ||
d5d8184d CD |
133 | /* Mark the initial VMID generation invalid */ |
134 | kvm->arch.vmid_gen = 0; | |
135 | ||
3caa2d8c | 136 | /* The maximum number of VCPUs is limited by the host's GIC model */ |
c7da6fa4 PF |
137 | kvm->arch.max_vcpus = vgic_present ? |
138 | kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS; | |
3caa2d8c | 139 | |
d5d8184d CD |
140 | return ret; |
141 | out_free_stage2_pgd: | |
142 | kvm_free_stage2_pgd(kvm); | |
143 | out_fail_alloc: | |
144 | return ret; | |
749cf76c CD |
145 | } |
146 | ||
147 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
148 | { | |
149 | return VM_FAULT_SIGBUS; | |
150 | } | |
151 | ||
749cf76c | 152 | |
d5d8184d CD |
153 | /** |
154 | * kvm_arch_destroy_vm - destroy the VM data structure | |
155 | * @kvm: pointer to the KVM struct | |
156 | */ | |
749cf76c CD |
157 | void kvm_arch_destroy_vm(struct kvm *kvm) |
158 | { | |
159 | int i; | |
160 | ||
d5d8184d CD |
161 | kvm_free_stage2_pgd(kvm); |
162 | ||
749cf76c CD |
163 | for (i = 0; i < KVM_MAX_VCPUS; ++i) { |
164 | if (kvm->vcpus[i]) { | |
165 | kvm_arch_vcpu_free(kvm->vcpus[i]); | |
166 | kvm->vcpus[i] = NULL; | |
167 | } | |
168 | } | |
c1bfb577 MZ |
169 | |
170 | kvm_vgic_destroy(kvm); | |
749cf76c CD |
171 | } |
172 | ||
784aa3d7 | 173 | int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) |
749cf76c CD |
174 | { |
175 | int r; | |
176 | switch (ext) { | |
1a89dd91 | 177 | case KVM_CAP_IRQCHIP: |
c7da6fa4 PF |
178 | r = vgic_present; |
179 | break; | |
d44758c0 | 180 | case KVM_CAP_IOEVENTFD: |
7330672b | 181 | case KVM_CAP_DEVICE_CTRL: |
749cf76c CD |
182 | case KVM_CAP_USER_MEMORY: |
183 | case KVM_CAP_SYNC_MMU: | |
184 | case KVM_CAP_DESTROY_MEMORY_REGION_WORKS: | |
185 | case KVM_CAP_ONE_REG: | |
aa024c2f | 186 | case KVM_CAP_ARM_PSCI: |
4447a208 | 187 | case KVM_CAP_ARM_PSCI_0_2: |
98047888 | 188 | case KVM_CAP_READONLY_MEM: |
ecccf0cc | 189 | case KVM_CAP_MP_STATE: |
749cf76c CD |
190 | r = 1; |
191 | break; | |
192 | case KVM_CAP_COALESCED_MMIO: | |
193 | r = KVM_COALESCED_MMIO_PAGE_OFFSET; | |
194 | break; | |
3401d546 CD |
195 | case KVM_CAP_ARM_SET_DEVICE_ADDR: |
196 | r = 1; | |
ca46e10f | 197 | break; |
749cf76c CD |
198 | case KVM_CAP_NR_VCPUS: |
199 | r = num_online_cpus(); | |
200 | break; | |
201 | case KVM_CAP_MAX_VCPUS: | |
202 | r = KVM_MAX_VCPUS; | |
203 | break; | |
204 | default: | |
b46f01ce | 205 | r = kvm_arch_dev_ioctl_check_extension(kvm, ext); |
749cf76c CD |
206 | break; |
207 | } | |
208 | return r; | |
209 | } | |
210 | ||
211 | long kvm_arch_dev_ioctl(struct file *filp, | |
212 | unsigned int ioctl, unsigned long arg) | |
213 | { | |
214 | return -EINVAL; | |
215 | } | |
216 | ||
749cf76c CD |
217 | |
218 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id) | |
219 | { | |
220 | int err; | |
221 | struct kvm_vcpu *vcpu; | |
222 | ||
716139df CD |
223 | if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) { |
224 | err = -EBUSY; | |
225 | goto out; | |
226 | } | |
227 | ||
3caa2d8c AP |
228 | if (id >= kvm->arch.max_vcpus) { |
229 | err = -EINVAL; | |
230 | goto out; | |
231 | } | |
232 | ||
749cf76c CD |
233 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); |
234 | if (!vcpu) { | |
235 | err = -ENOMEM; | |
236 | goto out; | |
237 | } | |
238 | ||
239 | err = kvm_vcpu_init(vcpu, kvm, id); | |
240 | if (err) | |
241 | goto free_vcpu; | |
242 | ||
c8dddecd | 243 | err = create_hyp_mappings(vcpu, vcpu + 1, PAGE_HYP); |
d5d8184d CD |
244 | if (err) |
245 | goto vcpu_uninit; | |
246 | ||
749cf76c | 247 | return vcpu; |
d5d8184d CD |
248 | vcpu_uninit: |
249 | kvm_vcpu_uninit(vcpu); | |
749cf76c CD |
250 | free_vcpu: |
251 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
252 | out: | |
253 | return ERR_PTR(err); | |
254 | } | |
255 | ||
31928aa5 | 256 | void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) |
749cf76c | 257 | { |
6c3d63c9 | 258 | kvm_vgic_vcpu_early_init(vcpu); |
749cf76c CD |
259 | } |
260 | ||
261 | void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) | |
262 | { | |
d5d8184d | 263 | kvm_mmu_free_memory_caches(vcpu); |
967f8427 | 264 | kvm_timer_vcpu_terminate(vcpu); |
c1bfb577 | 265 | kvm_vgic_vcpu_destroy(vcpu); |
5f0a714a | 266 | kvm_pmu_vcpu_destroy(vcpu); |
591d215a | 267 | kvm_vcpu_uninit(vcpu); |
d5d8184d | 268 | kmem_cache_free(kvm_vcpu_cache, vcpu); |
749cf76c CD |
269 | } |
270 | ||
271 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
272 | { | |
273 | kvm_arch_vcpu_free(vcpu); | |
274 | } | |
275 | ||
276 | int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu) | |
277 | { | |
1a748478 | 278 | return kvm_timer_should_fire(vcpu); |
749cf76c CD |
279 | } |
280 | ||
d35268da CD |
281 | void kvm_arch_vcpu_blocking(struct kvm_vcpu *vcpu) |
282 | { | |
283 | kvm_timer_schedule(vcpu); | |
284 | } | |
285 | ||
286 | void kvm_arch_vcpu_unblocking(struct kvm_vcpu *vcpu) | |
287 | { | |
288 | kvm_timer_unschedule(vcpu); | |
289 | } | |
290 | ||
749cf76c CD |
291 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) |
292 | { | |
f7ed45be CD |
293 | /* Force users to call KVM_ARM_VCPU_INIT */ |
294 | vcpu->arch.target = -1; | |
f7fa034d | 295 | bitmap_zero(vcpu->arch.features, KVM_VCPU_MAX_FEATURES); |
1a89dd91 | 296 | |
967f8427 MZ |
297 | /* Set up the timer */ |
298 | kvm_timer_vcpu_init(vcpu); | |
299 | ||
84e690bf AB |
300 | kvm_arm_reset_debug_ptr(vcpu); |
301 | ||
749cf76c CD |
302 | return 0; |
303 | } | |
304 | ||
749cf76c CD |
305 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) |
306 | { | |
86ce8535 | 307 | vcpu->cpu = cpu; |
3de50da6 | 308 | vcpu->arch.host_cpu_context = this_cpu_ptr(kvm_host_cpu_state); |
5b3e5e5b | 309 | |
1638a12d | 310 | kvm_arm_set_running_vcpu(vcpu); |
749cf76c CD |
311 | } |
312 | ||
313 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
314 | { | |
e9b152cb CD |
315 | /* |
316 | * The arch-generic KVM code expects the cpu field of a vcpu to be -1 | |
317 | * if the vcpu is no longer assigned to a cpu. This is used for the | |
318 | * optimized make_all_cpus_request path. | |
319 | */ | |
320 | vcpu->cpu = -1; | |
321 | ||
1638a12d | 322 | kvm_arm_set_running_vcpu(NULL); |
9b4a3004 | 323 | kvm_timer_vcpu_put(vcpu); |
749cf76c CD |
324 | } |
325 | ||
749cf76c CD |
326 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, |
327 | struct kvm_mp_state *mp_state) | |
328 | { | |
3781528e | 329 | if (vcpu->arch.power_off) |
ecccf0cc AB |
330 | mp_state->mp_state = KVM_MP_STATE_STOPPED; |
331 | else | |
332 | mp_state->mp_state = KVM_MP_STATE_RUNNABLE; | |
333 | ||
334 | return 0; | |
749cf76c CD |
335 | } |
336 | ||
337 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
338 | struct kvm_mp_state *mp_state) | |
339 | { | |
ecccf0cc AB |
340 | switch (mp_state->mp_state) { |
341 | case KVM_MP_STATE_RUNNABLE: | |
3781528e | 342 | vcpu->arch.power_off = false; |
ecccf0cc AB |
343 | break; |
344 | case KVM_MP_STATE_STOPPED: | |
3781528e | 345 | vcpu->arch.power_off = true; |
ecccf0cc AB |
346 | break; |
347 | default: | |
348 | return -EINVAL; | |
349 | } | |
350 | ||
351 | return 0; | |
749cf76c CD |
352 | } |
353 | ||
5b3e5e5b CD |
354 | /** |
355 | * kvm_arch_vcpu_runnable - determine if the vcpu can be scheduled | |
356 | * @v: The VCPU pointer | |
357 | * | |
358 | * If the guest CPU is not waiting for interrupts or an interrupt line is | |
359 | * asserted, the CPU is by definition runnable. | |
360 | */ | |
749cf76c CD |
361 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *v) |
362 | { | |
4f5f1dc0 | 363 | return ((!!v->arch.irq_lines || kvm_vgic_vcpu_pending_irq(v)) |
3b92830a | 364 | && !v->arch.power_off && !v->arch.pause); |
749cf76c CD |
365 | } |
366 | ||
f7ed45be CD |
367 | /* Just ensure a guest exit from a particular CPU */ |
368 | static void exit_vm_noop(void *info) | |
369 | { | |
370 | } | |
371 | ||
372 | void force_vm_exit(const cpumask_t *mask) | |
373 | { | |
898f949f | 374 | preempt_disable(); |
f7ed45be | 375 | smp_call_function_many(mask, exit_vm_noop, NULL, true); |
898f949f | 376 | preempt_enable(); |
f7ed45be CD |
377 | } |
378 | ||
379 | /** | |
380 | * need_new_vmid_gen - check that the VMID is still valid | |
6a727b0b | 381 | * @kvm: The VM's VMID to check |
f7ed45be CD |
382 | * |
383 | * return true if there is a new generation of VMIDs being used | |
384 | * | |
385 | * The hardware supports only 256 values with the value zero reserved for the | |
386 | * host, so we check if an assigned value belongs to a previous generation, | |
387 | * which which requires us to assign a new value. If we're the first to use a | |
388 | * VMID for the new generation, we must flush necessary caches and TLBs on all | |
389 | * CPUs. | |
390 | */ | |
391 | static bool need_new_vmid_gen(struct kvm *kvm) | |
392 | { | |
393 | return unlikely(kvm->arch.vmid_gen != atomic64_read(&kvm_vmid_gen)); | |
394 | } | |
395 | ||
396 | /** | |
397 | * update_vttbr - Update the VTTBR with a valid VMID before the guest runs | |
398 | * @kvm The guest that we are about to run | |
399 | * | |
400 | * Called from kvm_arch_vcpu_ioctl_run before entering the guest to ensure the | |
401 | * VM has a valid VMID, otherwise assigns a new one and flushes corresponding | |
402 | * caches and TLBs. | |
403 | */ | |
404 | static void update_vttbr(struct kvm *kvm) | |
405 | { | |
406 | phys_addr_t pgd_phys; | |
407 | u64 vmid; | |
408 | ||
409 | if (!need_new_vmid_gen(kvm)) | |
410 | return; | |
411 | ||
412 | spin_lock(&kvm_vmid_lock); | |
413 | ||
414 | /* | |
415 | * We need to re-check the vmid_gen here to ensure that if another vcpu | |
416 | * already allocated a valid vmid for this vm, then this vcpu should | |
417 | * use the same vmid. | |
418 | */ | |
419 | if (!need_new_vmid_gen(kvm)) { | |
420 | spin_unlock(&kvm_vmid_lock); | |
421 | return; | |
422 | } | |
423 | ||
424 | /* First user of a new VMID generation? */ | |
425 | if (unlikely(kvm_next_vmid == 0)) { | |
426 | atomic64_inc(&kvm_vmid_gen); | |
427 | kvm_next_vmid = 1; | |
428 | ||
429 | /* | |
430 | * On SMP we know no other CPUs can use this CPU's or each | |
431 | * other's VMID after force_vm_exit returns since the | |
432 | * kvm_vmid_lock blocks them from reentry to the guest. | |
433 | */ | |
434 | force_vm_exit(cpu_all_mask); | |
435 | /* | |
436 | * Now broadcast TLB + ICACHE invalidation over the inner | |
437 | * shareable domain to make sure all data structures are | |
438 | * clean. | |
439 | */ | |
440 | kvm_call_hyp(__kvm_flush_vm_context); | |
441 | } | |
442 | ||
443 | kvm->arch.vmid_gen = atomic64_read(&kvm_vmid_gen); | |
444 | kvm->arch.vmid = kvm_next_vmid; | |
445 | kvm_next_vmid++; | |
20475f78 | 446 | kvm_next_vmid &= (1 << kvm_vmid_bits) - 1; |
f7ed45be CD |
447 | |
448 | /* update vttbr to be used with the new vmid */ | |
9163ee23 | 449 | pgd_phys = virt_to_phys(kvm->arch.pgd); |
dbff124e | 450 | BUG_ON(pgd_phys & ~VTTBR_BADDR_MASK); |
20475f78 | 451 | vmid = ((u64)(kvm->arch.vmid) << VTTBR_VMID_SHIFT) & VTTBR_VMID_MASK(kvm_vmid_bits); |
dbff124e | 452 | kvm->arch.vttbr = pgd_phys | vmid; |
f7ed45be CD |
453 | |
454 | spin_unlock(&kvm_vmid_lock); | |
455 | } | |
456 | ||
f7ed45be CD |
457 | static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu) |
458 | { | |
05971120 | 459 | struct kvm *kvm = vcpu->kvm; |
41a54482 | 460 | int ret = 0; |
e1ba0207 | 461 | |
f7ed45be CD |
462 | if (likely(vcpu->arch.has_run_once)) |
463 | return 0; | |
464 | ||
465 | vcpu->arch.has_run_once = true; | |
aa024c2f | 466 | |
01ac5e34 | 467 | /* |
6d3cfbe2 PM |
468 | * Map the VGIC hardware resources before running a vcpu the first |
469 | * time on this VM. | |
01ac5e34 | 470 | */ |
c2f58514 | 471 | if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) { |
05971120 | 472 | ret = kvm_vgic_map_resources(kvm); |
01ac5e34 MZ |
473 | if (ret) |
474 | return ret; | |
475 | } | |
476 | ||
05971120 CD |
477 | /* |
478 | * Enable the arch timers only if we have an in-kernel VGIC | |
479 | * and it has been properly initialized, since we cannot handle | |
480 | * interrupts from the virtual timer with a userspace gic. | |
481 | */ | |
482 | if (irqchip_in_kernel(kvm) && vgic_initialized(kvm)) | |
41a54482 | 483 | ret = kvm_timer_enable(vcpu); |
05971120 | 484 | |
41a54482 | 485 | return ret; |
f7ed45be CD |
486 | } |
487 | ||
c1426e4c EA |
488 | bool kvm_arch_intc_initialized(struct kvm *kvm) |
489 | { | |
490 | return vgic_initialized(kvm); | |
491 | } | |
492 | ||
b13216cf | 493 | void kvm_arm_halt_guest(struct kvm *kvm) |
3b92830a EA |
494 | { |
495 | int i; | |
496 | struct kvm_vcpu *vcpu; | |
497 | ||
498 | kvm_for_each_vcpu(i, vcpu, kvm) | |
499 | vcpu->arch.pause = true; | |
b13216cf | 500 | kvm_make_all_cpus_request(kvm, KVM_REQ_VCPU_EXIT); |
3b92830a EA |
501 | } |
502 | ||
35a2d585 CD |
503 | void kvm_arm_halt_vcpu(struct kvm_vcpu *vcpu) |
504 | { | |
505 | vcpu->arch.pause = true; | |
506 | kvm_vcpu_kick(vcpu); | |
507 | } | |
508 | ||
509 | void kvm_arm_resume_vcpu(struct kvm_vcpu *vcpu) | |
b13216cf CD |
510 | { |
511 | struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu); | |
512 | ||
513 | vcpu->arch.pause = false; | |
514 | swake_up(wq); | |
515 | } | |
516 | ||
517 | void kvm_arm_resume_guest(struct kvm *kvm) | |
3b92830a EA |
518 | { |
519 | int i; | |
520 | struct kvm_vcpu *vcpu; | |
521 | ||
b13216cf CD |
522 | kvm_for_each_vcpu(i, vcpu, kvm) |
523 | kvm_arm_resume_vcpu(vcpu); | |
3b92830a EA |
524 | } |
525 | ||
3781528e | 526 | static void vcpu_sleep(struct kvm_vcpu *vcpu) |
aa024c2f | 527 | { |
8577370f | 528 | struct swait_queue_head *wq = kvm_arch_vcpu_wq(vcpu); |
aa024c2f | 529 | |
8577370f | 530 | swait_event_interruptible(*wq, ((!vcpu->arch.power_off) && |
3b92830a | 531 | (!vcpu->arch.pause))); |
aa024c2f MZ |
532 | } |
533 | ||
e8180dca AP |
534 | static int kvm_vcpu_initialized(struct kvm_vcpu *vcpu) |
535 | { | |
536 | return vcpu->arch.target >= 0; | |
537 | } | |
538 | ||
f7ed45be CD |
539 | /** |
540 | * kvm_arch_vcpu_ioctl_run - the main VCPU run function to execute guest code | |
541 | * @vcpu: The VCPU pointer | |
542 | * @run: The kvm_run structure pointer used for userspace state exchange | |
543 | * | |
544 | * This function is called through the VCPU_RUN ioctl called from user space. It | |
545 | * will execute VM code in a loop until the time slice for the process is used | |
546 | * or some emulation is needed from user space in which case the function will | |
547 | * return with return value 0 and with the kvm_run structure filled in with the | |
548 | * required data for the requested emulation. | |
549 | */ | |
749cf76c CD |
550 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run) |
551 | { | |
f7ed45be CD |
552 | int ret; |
553 | sigset_t sigsaved; | |
554 | ||
e8180dca | 555 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
f7ed45be CD |
556 | return -ENOEXEC; |
557 | ||
558 | ret = kvm_vcpu_first_run_init(vcpu); | |
559 | if (ret) | |
560 | return ret; | |
561 | ||
45e96ea6 CD |
562 | if (run->exit_reason == KVM_EXIT_MMIO) { |
563 | ret = kvm_handle_mmio_return(vcpu, vcpu->run); | |
564 | if (ret) | |
565 | return ret; | |
566 | } | |
567 | ||
f7ed45be CD |
568 | if (vcpu->sigset_active) |
569 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
570 | ||
571 | ret = 1; | |
572 | run->exit_reason = KVM_EXIT_UNKNOWN; | |
573 | while (ret > 0) { | |
574 | /* | |
575 | * Check conditions before entering the guest | |
576 | */ | |
577 | cond_resched(); | |
578 | ||
579 | update_vttbr(vcpu->kvm); | |
580 | ||
3b92830a | 581 | if (vcpu->arch.power_off || vcpu->arch.pause) |
3781528e | 582 | vcpu_sleep(vcpu); |
aa024c2f | 583 | |
abdf5843 MZ |
584 | /* |
585 | * Preparing the interrupts to be injected also | |
586 | * involves poking the GIC, which must be done in a | |
587 | * non-preemptible context. | |
588 | */ | |
1b3d546d | 589 | preempt_disable(); |
b02386eb | 590 | kvm_pmu_flush_hwstate(vcpu); |
7e16aa81 | 591 | kvm_timer_flush_hwstate(vcpu); |
abdf5843 MZ |
592 | kvm_vgic_flush_hwstate(vcpu); |
593 | ||
f7ed45be CD |
594 | local_irq_disable(); |
595 | ||
596 | /* | |
597 | * Re-check atomic conditions | |
598 | */ | |
599 | if (signal_pending(current)) { | |
600 | ret = -EINTR; | |
601 | run->exit_reason = KVM_EXIT_INTR; | |
602 | } | |
603 | ||
101d3da0 | 604 | if (ret <= 0 || need_new_vmid_gen(vcpu->kvm) || |
3b92830a | 605 | vcpu->arch.power_off || vcpu->arch.pause) { |
f7ed45be | 606 | local_irq_enable(); |
b02386eb | 607 | kvm_pmu_sync_hwstate(vcpu); |
4b4b4512 | 608 | kvm_timer_sync_hwstate(vcpu); |
1a89dd91 | 609 | kvm_vgic_sync_hwstate(vcpu); |
abdf5843 | 610 | preempt_enable(); |
f7ed45be CD |
611 | continue; |
612 | } | |
613 | ||
56c7f5e7 AB |
614 | kvm_arm_setup_debug(vcpu); |
615 | ||
f7ed45be CD |
616 | /************************************************************** |
617 | * Enter the guest | |
618 | */ | |
619 | trace_kvm_entry(*vcpu_pc(vcpu)); | |
6edaa530 | 620 | guest_enter_irqoff(); |
f7ed45be CD |
621 | vcpu->mode = IN_GUEST_MODE; |
622 | ||
623 | ret = kvm_call_hyp(__kvm_vcpu_run, vcpu); | |
624 | ||
625 | vcpu->mode = OUTSIDE_GUEST_MODE; | |
b19e6892 | 626 | vcpu->stat.exits++; |
1b3d546d CD |
627 | /* |
628 | * Back from guest | |
629 | *************************************************************/ | |
630 | ||
56c7f5e7 AB |
631 | kvm_arm_clear_debug(vcpu); |
632 | ||
f7ed45be CD |
633 | /* |
634 | * We may have taken a host interrupt in HYP mode (ie | |
635 | * while executing the guest). This interrupt is still | |
636 | * pending, as we haven't serviced it yet! | |
637 | * | |
638 | * We're now back in SVC mode, with interrupts | |
639 | * disabled. Enabling the interrupts now will have | |
640 | * the effect of taking the interrupt again, in SVC | |
641 | * mode this time. | |
642 | */ | |
643 | local_irq_enable(); | |
644 | ||
645 | /* | |
6edaa530 | 646 | * We do local_irq_enable() before calling guest_exit() so |
1b3d546d CD |
647 | * that if a timer interrupt hits while running the guest we |
648 | * account that tick as being spent in the guest. We enable | |
6edaa530 | 649 | * preemption after calling guest_exit() so that if we get |
1b3d546d CD |
650 | * preempted we make sure ticks after that is not counted as |
651 | * guest time. | |
652 | */ | |
6edaa530 | 653 | guest_exit(); |
b5905dc1 | 654 | trace_kvm_exit(ret, kvm_vcpu_trap_get_class(vcpu), *vcpu_pc(vcpu)); |
1b3d546d | 655 | |
4b4b4512 | 656 | /* |
b02386eb SZ |
657 | * We must sync the PMU and timer state before the vgic state so |
658 | * that the vgic can properly sample the updated state of the | |
4b4b4512 CD |
659 | * interrupt line. |
660 | */ | |
b02386eb | 661 | kvm_pmu_sync_hwstate(vcpu); |
4b4b4512 CD |
662 | kvm_timer_sync_hwstate(vcpu); |
663 | ||
1a89dd91 | 664 | kvm_vgic_sync_hwstate(vcpu); |
abdf5843 MZ |
665 | |
666 | preempt_enable(); | |
667 | ||
f7ed45be CD |
668 | ret = handle_exit(vcpu, run, ret); |
669 | } | |
670 | ||
671 | if (vcpu->sigset_active) | |
672 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
673 | return ret; | |
749cf76c CD |
674 | } |
675 | ||
86ce8535 CD |
676 | static int vcpu_interrupt_line(struct kvm_vcpu *vcpu, int number, bool level) |
677 | { | |
678 | int bit_index; | |
679 | bool set; | |
680 | unsigned long *ptr; | |
681 | ||
682 | if (number == KVM_ARM_IRQ_CPU_IRQ) | |
683 | bit_index = __ffs(HCR_VI); | |
684 | else /* KVM_ARM_IRQ_CPU_FIQ */ | |
685 | bit_index = __ffs(HCR_VF); | |
686 | ||
687 | ptr = (unsigned long *)&vcpu->arch.irq_lines; | |
688 | if (level) | |
689 | set = test_and_set_bit(bit_index, ptr); | |
690 | else | |
691 | set = test_and_clear_bit(bit_index, ptr); | |
692 | ||
693 | /* | |
694 | * If we didn't change anything, no need to wake up or kick other CPUs | |
695 | */ | |
696 | if (set == level) | |
697 | return 0; | |
698 | ||
699 | /* | |
700 | * The vcpu irq_lines field was updated, wake up sleeping VCPUs and | |
701 | * trigger a world-switch round on the running physical CPU to set the | |
702 | * virtual IRQ/FIQ fields in the HCR appropriately. | |
703 | */ | |
704 | kvm_vcpu_kick(vcpu); | |
705 | ||
706 | return 0; | |
707 | } | |
708 | ||
79558f11 AG |
709 | int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_level, |
710 | bool line_status) | |
86ce8535 CD |
711 | { |
712 | u32 irq = irq_level->irq; | |
713 | unsigned int irq_type, vcpu_idx, irq_num; | |
714 | int nrcpus = atomic_read(&kvm->online_vcpus); | |
715 | struct kvm_vcpu *vcpu = NULL; | |
716 | bool level = irq_level->level; | |
717 | ||
718 | irq_type = (irq >> KVM_ARM_IRQ_TYPE_SHIFT) & KVM_ARM_IRQ_TYPE_MASK; | |
719 | vcpu_idx = (irq >> KVM_ARM_IRQ_VCPU_SHIFT) & KVM_ARM_IRQ_VCPU_MASK; | |
720 | irq_num = (irq >> KVM_ARM_IRQ_NUM_SHIFT) & KVM_ARM_IRQ_NUM_MASK; | |
721 | ||
722 | trace_kvm_irq_line(irq_type, vcpu_idx, irq_num, irq_level->level); | |
723 | ||
5863c2ce MZ |
724 | switch (irq_type) { |
725 | case KVM_ARM_IRQ_TYPE_CPU: | |
726 | if (irqchip_in_kernel(kvm)) | |
727 | return -ENXIO; | |
86ce8535 | 728 | |
5863c2ce MZ |
729 | if (vcpu_idx >= nrcpus) |
730 | return -EINVAL; | |
86ce8535 | 731 | |
5863c2ce MZ |
732 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); |
733 | if (!vcpu) | |
734 | return -EINVAL; | |
86ce8535 | 735 | |
5863c2ce MZ |
736 | if (irq_num > KVM_ARM_IRQ_CPU_FIQ) |
737 | return -EINVAL; | |
738 | ||
739 | return vcpu_interrupt_line(vcpu, irq_num, level); | |
740 | case KVM_ARM_IRQ_TYPE_PPI: | |
741 | if (!irqchip_in_kernel(kvm)) | |
742 | return -ENXIO; | |
743 | ||
744 | if (vcpu_idx >= nrcpus) | |
745 | return -EINVAL; | |
746 | ||
747 | vcpu = kvm_get_vcpu(kvm, vcpu_idx); | |
748 | if (!vcpu) | |
749 | return -EINVAL; | |
750 | ||
751 | if (irq_num < VGIC_NR_SGIS || irq_num >= VGIC_NR_PRIVATE_IRQS) | |
752 | return -EINVAL; | |
86ce8535 | 753 | |
5863c2ce MZ |
754 | return kvm_vgic_inject_irq(kvm, vcpu->vcpu_id, irq_num, level); |
755 | case KVM_ARM_IRQ_TYPE_SPI: | |
756 | if (!irqchip_in_kernel(kvm)) | |
757 | return -ENXIO; | |
758 | ||
fd1d0ddf | 759 | if (irq_num < VGIC_NR_PRIVATE_IRQS) |
5863c2ce MZ |
760 | return -EINVAL; |
761 | ||
762 | return kvm_vgic_inject_irq(kvm, 0, irq_num, level); | |
763 | } | |
764 | ||
765 | return -EINVAL; | |
86ce8535 CD |
766 | } |
767 | ||
f7fa034d CD |
768 | static int kvm_vcpu_set_target(struct kvm_vcpu *vcpu, |
769 | const struct kvm_vcpu_init *init) | |
770 | { | |
771 | unsigned int i; | |
772 | int phys_target = kvm_target_cpu(); | |
773 | ||
774 | if (init->target != phys_target) | |
775 | return -EINVAL; | |
776 | ||
777 | /* | |
778 | * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must | |
779 | * use the same target. | |
780 | */ | |
781 | if (vcpu->arch.target != -1 && vcpu->arch.target != init->target) | |
782 | return -EINVAL; | |
783 | ||
784 | /* -ENOENT for unknown features, -EINVAL for invalid combinations. */ | |
785 | for (i = 0; i < sizeof(init->features) * 8; i++) { | |
786 | bool set = (init->features[i / 32] & (1 << (i % 32))); | |
787 | ||
788 | if (set && i >= KVM_VCPU_MAX_FEATURES) | |
789 | return -ENOENT; | |
790 | ||
791 | /* | |
792 | * Secondary and subsequent calls to KVM_ARM_VCPU_INIT must | |
793 | * use the same feature set. | |
794 | */ | |
795 | if (vcpu->arch.target != -1 && i < KVM_VCPU_MAX_FEATURES && | |
796 | test_bit(i, vcpu->arch.features) != set) | |
797 | return -EINVAL; | |
798 | ||
799 | if (set) | |
800 | set_bit(i, vcpu->arch.features); | |
801 | } | |
802 | ||
803 | vcpu->arch.target = phys_target; | |
804 | ||
805 | /* Now we know what it is, we can reset it. */ | |
806 | return kvm_reset_vcpu(vcpu); | |
807 | } | |
808 | ||
809 | ||
478a8237 CD |
810 | static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, |
811 | struct kvm_vcpu_init *init) | |
812 | { | |
813 | int ret; | |
814 | ||
815 | ret = kvm_vcpu_set_target(vcpu, init); | |
816 | if (ret) | |
817 | return ret; | |
818 | ||
957db105 CD |
819 | /* |
820 | * Ensure a rebooted VM will fault in RAM pages and detect if the | |
821 | * guest MMU is turned off and flush the caches as needed. | |
822 | */ | |
823 | if (vcpu->arch.has_run_once) | |
824 | stage2_unmap_vm(vcpu->kvm); | |
825 | ||
b856a591 CD |
826 | vcpu_reset_hcr(vcpu); |
827 | ||
478a8237 | 828 | /* |
3781528e | 829 | * Handle the "start in power-off" case. |
478a8237 | 830 | */ |
03f1d4c1 | 831 | if (test_bit(KVM_ARM_VCPU_POWER_OFF, vcpu->arch.features)) |
3781528e | 832 | vcpu->arch.power_off = true; |
3ad8b3de | 833 | else |
3781528e | 834 | vcpu->arch.power_off = false; |
478a8237 CD |
835 | |
836 | return 0; | |
837 | } | |
838 | ||
f577f6c2 SZ |
839 | static int kvm_arm_vcpu_set_attr(struct kvm_vcpu *vcpu, |
840 | struct kvm_device_attr *attr) | |
841 | { | |
842 | int ret = -ENXIO; | |
843 | ||
844 | switch (attr->group) { | |
845 | default: | |
bb0c70bc | 846 | ret = kvm_arm_vcpu_arch_set_attr(vcpu, attr); |
f577f6c2 SZ |
847 | break; |
848 | } | |
849 | ||
850 | return ret; | |
851 | } | |
852 | ||
853 | static int kvm_arm_vcpu_get_attr(struct kvm_vcpu *vcpu, | |
854 | struct kvm_device_attr *attr) | |
855 | { | |
856 | int ret = -ENXIO; | |
857 | ||
858 | switch (attr->group) { | |
859 | default: | |
bb0c70bc | 860 | ret = kvm_arm_vcpu_arch_get_attr(vcpu, attr); |
f577f6c2 SZ |
861 | break; |
862 | } | |
863 | ||
864 | return ret; | |
865 | } | |
866 | ||
867 | static int kvm_arm_vcpu_has_attr(struct kvm_vcpu *vcpu, | |
868 | struct kvm_device_attr *attr) | |
869 | { | |
870 | int ret = -ENXIO; | |
871 | ||
872 | switch (attr->group) { | |
873 | default: | |
bb0c70bc | 874 | ret = kvm_arm_vcpu_arch_has_attr(vcpu, attr); |
f577f6c2 SZ |
875 | break; |
876 | } | |
877 | ||
878 | return ret; | |
879 | } | |
880 | ||
749cf76c CD |
881 | long kvm_arch_vcpu_ioctl(struct file *filp, |
882 | unsigned int ioctl, unsigned long arg) | |
883 | { | |
884 | struct kvm_vcpu *vcpu = filp->private_data; | |
885 | void __user *argp = (void __user *)arg; | |
f577f6c2 | 886 | struct kvm_device_attr attr; |
749cf76c CD |
887 | |
888 | switch (ioctl) { | |
889 | case KVM_ARM_VCPU_INIT: { | |
890 | struct kvm_vcpu_init init; | |
891 | ||
892 | if (copy_from_user(&init, argp, sizeof(init))) | |
893 | return -EFAULT; | |
894 | ||
478a8237 | 895 | return kvm_arch_vcpu_ioctl_vcpu_init(vcpu, &init); |
749cf76c CD |
896 | } |
897 | case KVM_SET_ONE_REG: | |
898 | case KVM_GET_ONE_REG: { | |
899 | struct kvm_one_reg reg; | |
e8180dca AP |
900 | |
901 | if (unlikely(!kvm_vcpu_initialized(vcpu))) | |
902 | return -ENOEXEC; | |
903 | ||
749cf76c CD |
904 | if (copy_from_user(®, argp, sizeof(reg))) |
905 | return -EFAULT; | |
906 | if (ioctl == KVM_SET_ONE_REG) | |
907 | return kvm_arm_set_reg(vcpu, ®); | |
908 | else | |
909 | return kvm_arm_get_reg(vcpu, ®); | |
910 | } | |
911 | case KVM_GET_REG_LIST: { | |
912 | struct kvm_reg_list __user *user_list = argp; | |
913 | struct kvm_reg_list reg_list; | |
914 | unsigned n; | |
915 | ||
e8180dca AP |
916 | if (unlikely(!kvm_vcpu_initialized(vcpu))) |
917 | return -ENOEXEC; | |
918 | ||
749cf76c CD |
919 | if (copy_from_user(®_list, user_list, sizeof(reg_list))) |
920 | return -EFAULT; | |
921 | n = reg_list.n; | |
922 | reg_list.n = kvm_arm_num_regs(vcpu); | |
923 | if (copy_to_user(user_list, ®_list, sizeof(reg_list))) | |
924 | return -EFAULT; | |
925 | if (n < reg_list.n) | |
926 | return -E2BIG; | |
927 | return kvm_arm_copy_reg_indices(vcpu, user_list->reg); | |
928 | } | |
f577f6c2 SZ |
929 | case KVM_SET_DEVICE_ATTR: { |
930 | if (copy_from_user(&attr, argp, sizeof(attr))) | |
931 | return -EFAULT; | |
932 | return kvm_arm_vcpu_set_attr(vcpu, &attr); | |
933 | } | |
934 | case KVM_GET_DEVICE_ATTR: { | |
935 | if (copy_from_user(&attr, argp, sizeof(attr))) | |
936 | return -EFAULT; | |
937 | return kvm_arm_vcpu_get_attr(vcpu, &attr); | |
938 | } | |
939 | case KVM_HAS_DEVICE_ATTR: { | |
940 | if (copy_from_user(&attr, argp, sizeof(attr))) | |
941 | return -EFAULT; | |
942 | return kvm_arm_vcpu_has_attr(vcpu, &attr); | |
943 | } | |
749cf76c CD |
944 | default: |
945 | return -EINVAL; | |
946 | } | |
947 | } | |
948 | ||
53c810c3 MS |
949 | /** |
950 | * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot | |
951 | * @kvm: kvm instance | |
952 | * @log: slot id and address to which we copy the log | |
953 | * | |
954 | * Steps 1-4 below provide general overview of dirty page logging. See | |
955 | * kvm_get_dirty_log_protect() function description for additional details. | |
956 | * | |
957 | * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we | |
958 | * always flush the TLB (step 4) even if previous step failed and the dirty | |
959 | * bitmap may be corrupt. Regardless of previous outcome the KVM logging API | |
960 | * does not preclude user space subsequent dirty log read. Flushing TLB ensures | |
961 | * writes will be marked dirty for next log read. | |
962 | * | |
963 | * 1. Take a snapshot of the bit and clear it if needed. | |
964 | * 2. Write protect the corresponding page. | |
965 | * 3. Copy the snapshot to the userspace. | |
966 | * 4. Flush TLB's if needed. | |
967 | */ | |
749cf76c CD |
968 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) |
969 | { | |
53c810c3 MS |
970 | bool is_dirty = false; |
971 | int r; | |
972 | ||
973 | mutex_lock(&kvm->slots_lock); | |
974 | ||
975 | r = kvm_get_dirty_log_protect(kvm, log, &is_dirty); | |
976 | ||
977 | if (is_dirty) | |
978 | kvm_flush_remote_tlbs(kvm); | |
979 | ||
980 | mutex_unlock(&kvm->slots_lock); | |
981 | return r; | |
749cf76c CD |
982 | } |
983 | ||
3401d546 CD |
984 | static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm, |
985 | struct kvm_arm_device_addr *dev_addr) | |
986 | { | |
330690cd CD |
987 | unsigned long dev_id, type; |
988 | ||
989 | dev_id = (dev_addr->id & KVM_ARM_DEVICE_ID_MASK) >> | |
990 | KVM_ARM_DEVICE_ID_SHIFT; | |
991 | type = (dev_addr->id & KVM_ARM_DEVICE_TYPE_MASK) >> | |
992 | KVM_ARM_DEVICE_TYPE_SHIFT; | |
993 | ||
994 | switch (dev_id) { | |
995 | case KVM_ARM_DEVICE_VGIC_V2: | |
c7da6fa4 PF |
996 | if (!vgic_present) |
997 | return -ENXIO; | |
ce01e4e8 | 998 | return kvm_vgic_addr(kvm, type, &dev_addr->addr, true); |
330690cd CD |
999 | default: |
1000 | return -ENODEV; | |
1001 | } | |
3401d546 CD |
1002 | } |
1003 | ||
749cf76c CD |
1004 | long kvm_arch_vm_ioctl(struct file *filp, |
1005 | unsigned int ioctl, unsigned long arg) | |
1006 | { | |
3401d546 CD |
1007 | struct kvm *kvm = filp->private_data; |
1008 | void __user *argp = (void __user *)arg; | |
1009 | ||
1010 | switch (ioctl) { | |
5863c2ce | 1011 | case KVM_CREATE_IRQCHIP: { |
c7da6fa4 PF |
1012 | if (!vgic_present) |
1013 | return -ENXIO; | |
69ff5c61 | 1014 | return kvm_vgic_create(kvm, KVM_DEV_TYPE_ARM_VGIC_V2); |
5863c2ce | 1015 | } |
3401d546 CD |
1016 | case KVM_ARM_SET_DEVICE_ADDR: { |
1017 | struct kvm_arm_device_addr dev_addr; | |
1018 | ||
1019 | if (copy_from_user(&dev_addr, argp, sizeof(dev_addr))) | |
1020 | return -EFAULT; | |
1021 | return kvm_vm_ioctl_set_device_addr(kvm, &dev_addr); | |
1022 | } | |
42c4e0c7 AP |
1023 | case KVM_ARM_PREFERRED_TARGET: { |
1024 | int err; | |
1025 | struct kvm_vcpu_init init; | |
1026 | ||
1027 | err = kvm_vcpu_preferred_target(&init); | |
1028 | if (err) | |
1029 | return err; | |
1030 | ||
1031 | if (copy_to_user(argp, &init, sizeof(init))) | |
1032 | return -EFAULT; | |
1033 | ||
1034 | return 0; | |
1035 | } | |
3401d546 CD |
1036 | default: |
1037 | return -EINVAL; | |
1038 | } | |
749cf76c CD |
1039 | } |
1040 | ||
d157f4a5 | 1041 | static void cpu_init_hyp_mode(void *dummy) |
342cd0ab | 1042 | { |
dac288f7 | 1043 | phys_addr_t pgd_ptr; |
342cd0ab CD |
1044 | unsigned long hyp_stack_ptr; |
1045 | unsigned long stack_page; | |
1046 | unsigned long vector_ptr; | |
1047 | ||
1048 | /* Switch from the HYP stub to our own HYP init vector */ | |
5a677ce0 | 1049 | __hyp_set_vectors(kvm_get_idmap_vector()); |
342cd0ab | 1050 | |
dac288f7 | 1051 | pgd_ptr = kvm_mmu_get_httbr(); |
1436c1aa | 1052 | stack_page = __this_cpu_read(kvm_arm_hyp_stack_page); |
342cd0ab | 1053 | hyp_stack_ptr = stack_page + PAGE_SIZE; |
a0bf9776 | 1054 | vector_ptr = (unsigned long)kvm_ksym_ref(__kvm_hyp_vector); |
342cd0ab | 1055 | |
12fda812 | 1056 | __cpu_init_hyp_mode(pgd_ptr, hyp_stack_ptr, vector_ptr); |
35a2491a | 1057 | __cpu_init_stage2(); |
56c7f5e7 AB |
1058 | |
1059 | kvm_arm_init_debug(); | |
342cd0ab CD |
1060 | } |
1061 | ||
5f5560b1 JM |
1062 | static void cpu_hyp_reinit(void) |
1063 | { | |
1064 | if (is_kernel_in_hyp_mode()) { | |
1065 | /* | |
67f69197 | 1066 | * __cpu_init_stage2() is safe to call even if the PM |
5f5560b1 JM |
1067 | * event was cancelled before the CPU was reset. |
1068 | */ | |
67f69197 | 1069 | __cpu_init_stage2(); |
5f5560b1 JM |
1070 | } else { |
1071 | if (__hyp_get_vectors() == hyp_default_vectors) | |
1072 | cpu_init_hyp_mode(NULL); | |
1073 | } | |
1074 | } | |
1075 | ||
67f69197 | 1076 | static void cpu_hyp_reset(void) |
d157f4a5 | 1077 | { |
12fda812 | 1078 | if (!is_kernel_in_hyp_mode()) |
e537ecd7 MZ |
1079 | __cpu_reset_hyp_mode(hyp_default_vectors, |
1080 | kvm_get_idmap_start()); | |
67f69197 AT |
1081 | } |
1082 | ||
1083 | static void _kvm_arch_hardware_enable(void *discard) | |
1084 | { | |
1085 | if (!__this_cpu_read(kvm_arm_hardware_enabled)) { | |
5f5560b1 | 1086 | cpu_hyp_reinit(); |
67f69197 | 1087 | __this_cpu_write(kvm_arm_hardware_enabled, 1); |
d157f4a5 | 1088 | } |
67f69197 | 1089 | } |
d157f4a5 | 1090 | |
67f69197 AT |
1091 | int kvm_arch_hardware_enable(void) |
1092 | { | |
1093 | _kvm_arch_hardware_enable(NULL); | |
1094 | return 0; | |
342cd0ab CD |
1095 | } |
1096 | ||
67f69197 AT |
1097 | static void _kvm_arch_hardware_disable(void *discard) |
1098 | { | |
1099 | if (__this_cpu_read(kvm_arm_hardware_enabled)) { | |
1100 | cpu_hyp_reset(); | |
1101 | __this_cpu_write(kvm_arm_hardware_enabled, 0); | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | void kvm_arch_hardware_disable(void) | |
1106 | { | |
1107 | _kvm_arch_hardware_disable(NULL); | |
1108 | } | |
d157f4a5 | 1109 | |
1fcf7ce0 LP |
1110 | #ifdef CONFIG_CPU_PM |
1111 | static int hyp_init_cpu_pm_notifier(struct notifier_block *self, | |
1112 | unsigned long cmd, | |
1113 | void *v) | |
1114 | { | |
67f69197 AT |
1115 | /* |
1116 | * kvm_arm_hardware_enabled is left with its old value over | |
1117 | * PM_ENTER->PM_EXIT. It is used to indicate PM_EXIT should | |
1118 | * re-enable hyp. | |
1119 | */ | |
1120 | switch (cmd) { | |
1121 | case CPU_PM_ENTER: | |
1122 | if (__this_cpu_read(kvm_arm_hardware_enabled)) | |
1123 | /* | |
1124 | * don't update kvm_arm_hardware_enabled here | |
1125 | * so that the hardware will be re-enabled | |
1126 | * when we resume. See below. | |
1127 | */ | |
1128 | cpu_hyp_reset(); | |
1129 | ||
1fcf7ce0 | 1130 | return NOTIFY_OK; |
67f69197 AT |
1131 | case CPU_PM_EXIT: |
1132 | if (__this_cpu_read(kvm_arm_hardware_enabled)) | |
1133 | /* The hardware was enabled before suspend. */ | |
1134 | cpu_hyp_reinit(); | |
1fcf7ce0 | 1135 | |
67f69197 AT |
1136 | return NOTIFY_OK; |
1137 | ||
1138 | default: | |
1139 | return NOTIFY_DONE; | |
1140 | } | |
1fcf7ce0 LP |
1141 | } |
1142 | ||
1143 | static struct notifier_block hyp_init_cpu_pm_nb = { | |
1144 | .notifier_call = hyp_init_cpu_pm_notifier, | |
1145 | }; | |
1146 | ||
1147 | static void __init hyp_cpu_pm_init(void) | |
1148 | { | |
1149 | cpu_pm_register_notifier(&hyp_init_cpu_pm_nb); | |
1150 | } | |
06a71a24 SH |
1151 | static void __init hyp_cpu_pm_exit(void) |
1152 | { | |
1153 | cpu_pm_unregister_notifier(&hyp_init_cpu_pm_nb); | |
1154 | } | |
1fcf7ce0 LP |
1155 | #else |
1156 | static inline void hyp_cpu_pm_init(void) | |
1157 | { | |
1158 | } | |
06a71a24 SH |
1159 | static inline void hyp_cpu_pm_exit(void) |
1160 | { | |
1161 | } | |
1fcf7ce0 LP |
1162 | #endif |
1163 | ||
1e947bad MZ |
1164 | static void teardown_common_resources(void) |
1165 | { | |
1166 | free_percpu(kvm_host_cpu_state); | |
1167 | } | |
1168 | ||
1169 | static int init_common_resources(void) | |
1170 | { | |
1171 | kvm_host_cpu_state = alloc_percpu(kvm_cpu_context_t); | |
1172 | if (!kvm_host_cpu_state) { | |
1173 | kvm_err("Cannot allocate host CPU state\n"); | |
1174 | return -ENOMEM; | |
1175 | } | |
1176 | ||
1177 | return 0; | |
1178 | } | |
1179 | ||
1180 | static int init_subsystems(void) | |
1181 | { | |
67f69197 | 1182 | int err = 0; |
1e947bad | 1183 | |
5f5560b1 | 1184 | /* |
67f69197 | 1185 | * Enable hardware so that subsystem initialisation can access EL2. |
5f5560b1 | 1186 | */ |
67f69197 | 1187 | on_each_cpu(_kvm_arch_hardware_enable, NULL, 1); |
5f5560b1 JM |
1188 | |
1189 | /* | |
1190 | * Register CPU lower-power notifier | |
1191 | */ | |
1192 | hyp_cpu_pm_init(); | |
1193 | ||
1e947bad MZ |
1194 | /* |
1195 | * Init HYP view of VGIC | |
1196 | */ | |
1197 | err = kvm_vgic_hyp_init(); | |
1198 | switch (err) { | |
1199 | case 0: | |
1200 | vgic_present = true; | |
1201 | break; | |
1202 | case -ENODEV: | |
1203 | case -ENXIO: | |
1204 | vgic_present = false; | |
67f69197 | 1205 | err = 0; |
1e947bad MZ |
1206 | break; |
1207 | default: | |
67f69197 | 1208 | goto out; |
1e947bad MZ |
1209 | } |
1210 | ||
1211 | /* | |
1212 | * Init HYP architected timer support | |
1213 | */ | |
1214 | err = kvm_timer_hyp_init(); | |
1215 | if (err) | |
67f69197 | 1216 | goto out; |
1e947bad MZ |
1217 | |
1218 | kvm_perf_init(); | |
1219 | kvm_coproc_table_init(); | |
1220 | ||
67f69197 AT |
1221 | out: |
1222 | on_each_cpu(_kvm_arch_hardware_disable, NULL, 1); | |
1223 | ||
1224 | return err; | |
1e947bad MZ |
1225 | } |
1226 | ||
1227 | static void teardown_hyp_mode(void) | |
1228 | { | |
1229 | int cpu; | |
1230 | ||
1231 | if (is_kernel_in_hyp_mode()) | |
1232 | return; | |
1233 | ||
1234 | free_hyp_pgds(); | |
1235 | for_each_possible_cpu(cpu) | |
1236 | free_page(per_cpu(kvm_arm_hyp_stack_page, cpu)); | |
06a71a24 | 1237 | hyp_cpu_pm_exit(); |
1e947bad MZ |
1238 | } |
1239 | ||
1240 | static int init_vhe_mode(void) | |
1241 | { | |
1e947bad MZ |
1242 | /* set size of VMID supported by CPU */ |
1243 | kvm_vmid_bits = kvm_get_vmid_bits(); | |
1244 | kvm_info("%d-bit VMID\n", kvm_vmid_bits); | |
1245 | ||
1246 | kvm_info("VHE mode initialized successfully\n"); | |
1247 | return 0; | |
1248 | } | |
1249 | ||
342cd0ab CD |
1250 | /** |
1251 | * Inits Hyp-mode on all online CPUs | |
1252 | */ | |
1253 | static int init_hyp_mode(void) | |
1254 | { | |
342cd0ab CD |
1255 | int cpu; |
1256 | int err = 0; | |
1257 | ||
1258 | /* | |
1259 | * Allocate Hyp PGD and setup Hyp identity mapping | |
1260 | */ | |
1261 | err = kvm_mmu_init(); | |
1262 | if (err) | |
1263 | goto out_err; | |
1264 | ||
1265 | /* | |
1266 | * It is probably enough to obtain the default on one | |
1267 | * CPU. It's unlikely to be different on the others. | |
1268 | */ | |
1269 | hyp_default_vectors = __hyp_get_vectors(); | |
1270 | ||
1271 | /* | |
1272 | * Allocate stack pages for Hypervisor-mode | |
1273 | */ | |
1274 | for_each_possible_cpu(cpu) { | |
1275 | unsigned long stack_page; | |
1276 | ||
1277 | stack_page = __get_free_page(GFP_KERNEL); | |
1278 | if (!stack_page) { | |
1279 | err = -ENOMEM; | |
1e947bad | 1280 | goto out_err; |
342cd0ab CD |
1281 | } |
1282 | ||
1283 | per_cpu(kvm_arm_hyp_stack_page, cpu) = stack_page; | |
1284 | } | |
1285 | ||
342cd0ab CD |
1286 | /* |
1287 | * Map the Hyp-code called directly from the host | |
1288 | */ | |
588ab3f9 | 1289 | err = create_hyp_mappings(kvm_ksym_ref(__hyp_text_start), |
59002705 | 1290 | kvm_ksym_ref(__hyp_text_end), PAGE_HYP_EXEC); |
342cd0ab CD |
1291 | if (err) { |
1292 | kvm_err("Cannot map world-switch code\n"); | |
1e947bad | 1293 | goto out_err; |
342cd0ab CD |
1294 | } |
1295 | ||
a0bf9776 | 1296 | err = create_hyp_mappings(kvm_ksym_ref(__start_rodata), |
74a6b888 | 1297 | kvm_ksym_ref(__end_rodata), PAGE_HYP_RO); |
910917bb MZ |
1298 | if (err) { |
1299 | kvm_err("Cannot map rodata section\n"); | |
1e947bad | 1300 | goto out_err; |
910917bb MZ |
1301 | } |
1302 | ||
342cd0ab CD |
1303 | /* |
1304 | * Map the Hyp stack pages | |
1305 | */ | |
1306 | for_each_possible_cpu(cpu) { | |
1307 | char *stack_page = (char *)per_cpu(kvm_arm_hyp_stack_page, cpu); | |
c8dddecd MZ |
1308 | err = create_hyp_mappings(stack_page, stack_page + PAGE_SIZE, |
1309 | PAGE_HYP); | |
342cd0ab CD |
1310 | |
1311 | if (err) { | |
1312 | kvm_err("Cannot map hyp stack\n"); | |
1e947bad | 1313 | goto out_err; |
342cd0ab CD |
1314 | } |
1315 | } | |
1316 | ||
342cd0ab | 1317 | for_each_possible_cpu(cpu) { |
3de50da6 | 1318 | kvm_cpu_context_t *cpu_ctxt; |
342cd0ab | 1319 | |
3de50da6 | 1320 | cpu_ctxt = per_cpu_ptr(kvm_host_cpu_state, cpu); |
c8dddecd | 1321 | err = create_hyp_mappings(cpu_ctxt, cpu_ctxt + 1, PAGE_HYP); |
342cd0ab CD |
1322 | |
1323 | if (err) { | |
3de50da6 | 1324 | kvm_err("Cannot map host CPU state: %d\n", err); |
1e947bad | 1325 | goto out_err; |
342cd0ab CD |
1326 | } |
1327 | } | |
1328 | ||
20475f78 VM |
1329 | /* set size of VMID supported by CPU */ |
1330 | kvm_vmid_bits = kvm_get_vmid_bits(); | |
1331 | kvm_info("%d-bit VMID\n", kvm_vmid_bits); | |
1332 | ||
342cd0ab | 1333 | kvm_info("Hyp mode initialized successfully\n"); |
210552c1 | 1334 | |
342cd0ab | 1335 | return 0; |
1e947bad | 1336 | |
342cd0ab | 1337 | out_err: |
1e947bad | 1338 | teardown_hyp_mode(); |
342cd0ab CD |
1339 | kvm_err("error initializing Hyp mode: %d\n", err); |
1340 | return err; | |
1341 | } | |
1342 | ||
d4e071ce AP |
1343 | static void check_kvm_target_cpu(void *ret) |
1344 | { | |
1345 | *(int *)ret = kvm_target_cpu(); | |
1346 | } | |
1347 | ||
4429fc64 AP |
1348 | struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr) |
1349 | { | |
1350 | struct kvm_vcpu *vcpu; | |
1351 | int i; | |
1352 | ||
1353 | mpidr &= MPIDR_HWID_BITMASK; | |
1354 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1355 | if (mpidr == kvm_vcpu_get_mpidr_aff(vcpu)) | |
1356 | return vcpu; | |
1357 | } | |
1358 | return NULL; | |
1359 | } | |
1360 | ||
342cd0ab CD |
1361 | /** |
1362 | * Initialize Hyp-mode and memory mappings on all CPUs. | |
1363 | */ | |
749cf76c CD |
1364 | int kvm_arch_init(void *opaque) |
1365 | { | |
342cd0ab | 1366 | int err; |
d4e071ce | 1367 | int ret, cpu; |
342cd0ab CD |
1368 | |
1369 | if (!is_hyp_mode_available()) { | |
1370 | kvm_err("HYP mode not available\n"); | |
1371 | return -ENODEV; | |
1372 | } | |
1373 | ||
d4e071ce AP |
1374 | for_each_online_cpu(cpu) { |
1375 | smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1); | |
1376 | if (ret < 0) { | |
1377 | kvm_err("Error, CPU %d not supported!\n", cpu); | |
1378 | return -ENODEV; | |
1379 | } | |
342cd0ab CD |
1380 | } |
1381 | ||
1e947bad | 1382 | err = init_common_resources(); |
342cd0ab | 1383 | if (err) |
1e947bad | 1384 | return err; |
342cd0ab | 1385 | |
1e947bad MZ |
1386 | if (is_kernel_in_hyp_mode()) |
1387 | err = init_vhe_mode(); | |
1388 | else | |
1389 | err = init_hyp_mode(); | |
1390 | if (err) | |
d157f4a5 | 1391 | goto out_err; |
8146875d | 1392 | |
1e947bad MZ |
1393 | err = init_subsystems(); |
1394 | if (err) | |
1395 | goto out_hyp; | |
1fcf7ce0 | 1396 | |
749cf76c | 1397 | return 0; |
1e947bad MZ |
1398 | |
1399 | out_hyp: | |
1400 | teardown_hyp_mode(); | |
342cd0ab | 1401 | out_err: |
1e947bad | 1402 | teardown_common_resources(); |
342cd0ab | 1403 | return err; |
749cf76c CD |
1404 | } |
1405 | ||
1406 | /* NOP: Compiling as a module not supported */ | |
1407 | void kvm_arch_exit(void) | |
1408 | { | |
210552c1 | 1409 | kvm_perf_teardown(); |
749cf76c CD |
1410 | } |
1411 | ||
1412 | static int arm_init(void) | |
1413 | { | |
1414 | int rc = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); | |
1415 | return rc; | |
1416 | } | |
1417 | ||
1418 | module_init(arm_init); |