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1 | /* | |
2 | * hosting zSeries kernel virtual machines | |
3 | * | |
4 | * Copyright IBM Corp. 2008, 2009 | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License (version 2 only) | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * Author(s): Carsten Otte <cotte@de.ibm.com> | |
11 | * Christian Borntraeger <borntraeger@de.ibm.com> | |
12 | * Heiko Carstens <heiko.carstens@de.ibm.com> | |
13 | * Christian Ehrhardt <ehrhardt@de.ibm.com> | |
14 | * Jason J. Herne <jjherne@us.ibm.com> | |
15 | */ | |
16 | ||
17 | #include <linux/compiler.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/fs.h> | |
20 | #include <linux/hrtimer.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/kvm.h> | |
23 | #include <linux/kvm_host.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/timer.h> | |
27 | #include <asm/asm-offsets.h> | |
28 | #include <asm/lowcore.h> | |
29 | #include <asm/pgtable.h> | |
30 | #include <asm/nmi.h> | |
31 | #include <asm/switch_to.h> | |
32 | #include <asm/facility.h> | |
33 | #include <asm/sclp.h> | |
34 | #include "kvm-s390.h" | |
35 | #include "gaccess.h" | |
36 | ||
37 | #define CREATE_TRACE_POINTS | |
38 | #include "trace.h" | |
39 | #include "trace-s390.h" | |
40 | ||
41 | #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU | |
42 | ||
43 | struct kvm_stats_debugfs_item debugfs_entries[] = { | |
44 | { "userspace_handled", VCPU_STAT(exit_userspace) }, | |
45 | { "exit_null", VCPU_STAT(exit_null) }, | |
46 | { "exit_validity", VCPU_STAT(exit_validity) }, | |
47 | { "exit_stop_request", VCPU_STAT(exit_stop_request) }, | |
48 | { "exit_external_request", VCPU_STAT(exit_external_request) }, | |
49 | { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) }, | |
50 | { "exit_instruction", VCPU_STAT(exit_instruction) }, | |
51 | { "exit_program_interruption", VCPU_STAT(exit_program_interruption) }, | |
52 | { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) }, | |
53 | { "instruction_lctlg", VCPU_STAT(instruction_lctlg) }, | |
54 | { "instruction_lctl", VCPU_STAT(instruction_lctl) }, | |
55 | { "instruction_stctl", VCPU_STAT(instruction_stctl) }, | |
56 | { "instruction_stctg", VCPU_STAT(instruction_stctg) }, | |
57 | { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) }, | |
58 | { "deliver_external_call", VCPU_STAT(deliver_external_call) }, | |
59 | { "deliver_service_signal", VCPU_STAT(deliver_service_signal) }, | |
60 | { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) }, | |
61 | { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) }, | |
62 | { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) }, | |
63 | { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) }, | |
64 | { "deliver_program_interruption", VCPU_STAT(deliver_program_int) }, | |
65 | { "exit_wait_state", VCPU_STAT(exit_wait_state) }, | |
66 | { "instruction_pfmf", VCPU_STAT(instruction_pfmf) }, | |
67 | { "instruction_stidp", VCPU_STAT(instruction_stidp) }, | |
68 | { "instruction_spx", VCPU_STAT(instruction_spx) }, | |
69 | { "instruction_stpx", VCPU_STAT(instruction_stpx) }, | |
70 | { "instruction_stap", VCPU_STAT(instruction_stap) }, | |
71 | { "instruction_storage_key", VCPU_STAT(instruction_storage_key) }, | |
72 | { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) }, | |
73 | { "instruction_stsch", VCPU_STAT(instruction_stsch) }, | |
74 | { "instruction_chsc", VCPU_STAT(instruction_chsc) }, | |
75 | { "instruction_essa", VCPU_STAT(instruction_essa) }, | |
76 | { "instruction_stsi", VCPU_STAT(instruction_stsi) }, | |
77 | { "instruction_stfl", VCPU_STAT(instruction_stfl) }, | |
78 | { "instruction_tprot", VCPU_STAT(instruction_tprot) }, | |
79 | { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) }, | |
80 | { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) }, | |
81 | { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) }, | |
82 | { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) }, | |
83 | { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) }, | |
84 | { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) }, | |
85 | { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) }, | |
86 | { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) }, | |
87 | { "diagnose_10", VCPU_STAT(diagnose_10) }, | |
88 | { "diagnose_44", VCPU_STAT(diagnose_44) }, | |
89 | { "diagnose_9c", VCPU_STAT(diagnose_9c) }, | |
90 | { NULL } | |
91 | }; | |
92 | ||
93 | unsigned long *vfacilities; | |
94 | static struct gmap_notifier gmap_notifier; | |
95 | ||
96 | /* test availability of vfacility */ | |
97 | int test_vfacility(unsigned long nr) | |
98 | { | |
99 | return __test_facility(nr, (void *) vfacilities); | |
100 | } | |
101 | ||
102 | /* Section: not file related */ | |
103 | int kvm_arch_hardware_enable(void *garbage) | |
104 | { | |
105 | /* every s390 is virtualization enabled ;-) */ | |
106 | return 0; | |
107 | } | |
108 | ||
109 | void kvm_arch_hardware_disable(void *garbage) | |
110 | { | |
111 | } | |
112 | ||
113 | static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address); | |
114 | ||
115 | int kvm_arch_hardware_setup(void) | |
116 | { | |
117 | gmap_notifier.notifier_call = kvm_gmap_notifier; | |
118 | gmap_register_ipte_notifier(&gmap_notifier); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | void kvm_arch_hardware_unsetup(void) | |
123 | { | |
124 | gmap_unregister_ipte_notifier(&gmap_notifier); | |
125 | } | |
126 | ||
127 | void kvm_arch_check_processor_compat(void *rtn) | |
128 | { | |
129 | } | |
130 | ||
131 | int kvm_arch_init(void *opaque) | |
132 | { | |
133 | return 0; | |
134 | } | |
135 | ||
136 | void kvm_arch_exit(void) | |
137 | { | |
138 | } | |
139 | ||
140 | /* Section: device related */ | |
141 | long kvm_arch_dev_ioctl(struct file *filp, | |
142 | unsigned int ioctl, unsigned long arg) | |
143 | { | |
144 | if (ioctl == KVM_S390_ENABLE_SIE) | |
145 | return s390_enable_sie(); | |
146 | return -EINVAL; | |
147 | } | |
148 | ||
149 | int kvm_dev_ioctl_check_extension(long ext) | |
150 | { | |
151 | int r; | |
152 | ||
153 | switch (ext) { | |
154 | case KVM_CAP_S390_PSW: | |
155 | case KVM_CAP_S390_GMAP: | |
156 | case KVM_CAP_SYNC_MMU: | |
157 | #ifdef CONFIG_KVM_S390_UCONTROL | |
158 | case KVM_CAP_S390_UCONTROL: | |
159 | #endif | |
160 | case KVM_CAP_ASYNC_PF: | |
161 | case KVM_CAP_SYNC_REGS: | |
162 | case KVM_CAP_ONE_REG: | |
163 | case KVM_CAP_ENABLE_CAP: | |
164 | case KVM_CAP_S390_CSS_SUPPORT: | |
165 | case KVM_CAP_IOEVENTFD: | |
166 | case KVM_CAP_DEVICE_CTRL: | |
167 | case KVM_CAP_ENABLE_CAP_VM: | |
168 | case KVM_CAP_VM_ATTRIBUTES: | |
169 | r = 1; | |
170 | break; | |
171 | case KVM_CAP_NR_VCPUS: | |
172 | case KVM_CAP_MAX_VCPUS: | |
173 | r = KVM_MAX_VCPUS; | |
174 | break; | |
175 | case KVM_CAP_NR_MEMSLOTS: | |
176 | r = KVM_USER_MEM_SLOTS; | |
177 | break; | |
178 | case KVM_CAP_S390_COW: | |
179 | r = MACHINE_HAS_ESOP; | |
180 | break; | |
181 | default: | |
182 | r = 0; | |
183 | } | |
184 | return r; | |
185 | } | |
186 | ||
187 | static void kvm_s390_sync_dirty_log(struct kvm *kvm, | |
188 | struct kvm_memory_slot *memslot) | |
189 | { | |
190 | gfn_t cur_gfn, last_gfn; | |
191 | unsigned long address; | |
192 | struct gmap *gmap = kvm->arch.gmap; | |
193 | ||
194 | down_read(&gmap->mm->mmap_sem); | |
195 | /* Loop over all guest pages */ | |
196 | last_gfn = memslot->base_gfn + memslot->npages; | |
197 | for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) { | |
198 | address = gfn_to_hva_memslot(memslot, cur_gfn); | |
199 | ||
200 | if (gmap_test_and_clear_dirty(address, gmap)) | |
201 | mark_page_dirty(kvm, cur_gfn); | |
202 | } | |
203 | up_read(&gmap->mm->mmap_sem); | |
204 | } | |
205 | ||
206 | /* Section: vm related */ | |
207 | /* | |
208 | * Get (and clear) the dirty memory log for a memory slot. | |
209 | */ | |
210 | int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, | |
211 | struct kvm_dirty_log *log) | |
212 | { | |
213 | int r; | |
214 | unsigned long n; | |
215 | struct kvm_memory_slot *memslot; | |
216 | int is_dirty = 0; | |
217 | ||
218 | mutex_lock(&kvm->slots_lock); | |
219 | ||
220 | r = -EINVAL; | |
221 | if (log->slot >= KVM_USER_MEM_SLOTS) | |
222 | goto out; | |
223 | ||
224 | memslot = id_to_memslot(kvm->memslots, log->slot); | |
225 | r = -ENOENT; | |
226 | if (!memslot->dirty_bitmap) | |
227 | goto out; | |
228 | ||
229 | kvm_s390_sync_dirty_log(kvm, memslot); | |
230 | r = kvm_get_dirty_log(kvm, log, &is_dirty); | |
231 | if (r) | |
232 | goto out; | |
233 | ||
234 | /* Clear the dirty log */ | |
235 | if (is_dirty) { | |
236 | n = kvm_dirty_bitmap_bytes(memslot); | |
237 | memset(memslot->dirty_bitmap, 0, n); | |
238 | } | |
239 | r = 0; | |
240 | out: | |
241 | mutex_unlock(&kvm->slots_lock); | |
242 | return r; | |
243 | } | |
244 | ||
245 | static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap) | |
246 | { | |
247 | int r; | |
248 | ||
249 | if (cap->flags) | |
250 | return -EINVAL; | |
251 | ||
252 | switch (cap->cap) { | |
253 | case KVM_CAP_S390_IRQCHIP: | |
254 | kvm->arch.use_irqchip = 1; | |
255 | r = 0; | |
256 | break; | |
257 | default: | |
258 | r = -EINVAL; | |
259 | break; | |
260 | } | |
261 | return r; | |
262 | } | |
263 | ||
264 | static int kvm_s390_mem_control(struct kvm *kvm, struct kvm_device_attr *attr) | |
265 | { | |
266 | int ret; | |
267 | unsigned int idx; | |
268 | switch (attr->attr) { | |
269 | case KVM_S390_VM_MEM_ENABLE_CMMA: | |
270 | ret = -EBUSY; | |
271 | mutex_lock(&kvm->lock); | |
272 | if (atomic_read(&kvm->online_vcpus) == 0) { | |
273 | kvm->arch.use_cmma = 1; | |
274 | ret = 0; | |
275 | } | |
276 | mutex_unlock(&kvm->lock); | |
277 | break; | |
278 | case KVM_S390_VM_MEM_CLR_CMMA: | |
279 | mutex_lock(&kvm->lock); | |
280 | idx = srcu_read_lock(&kvm->srcu); | |
281 | page_table_reset_pgste(kvm->arch.gmap->mm, 0, TASK_SIZE, false); | |
282 | srcu_read_unlock(&kvm->srcu, idx); | |
283 | mutex_unlock(&kvm->lock); | |
284 | ret = 0; | |
285 | break; | |
286 | default: | |
287 | ret = -ENXIO; | |
288 | break; | |
289 | } | |
290 | return ret; | |
291 | } | |
292 | ||
293 | static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr) | |
294 | { | |
295 | int ret; | |
296 | ||
297 | switch (attr->group) { | |
298 | case KVM_S390_VM_MEM_CTRL: | |
299 | ret = kvm_s390_mem_control(kvm, attr); | |
300 | break; | |
301 | default: | |
302 | ret = -ENXIO; | |
303 | break; | |
304 | } | |
305 | ||
306 | return ret; | |
307 | } | |
308 | ||
309 | static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr) | |
310 | { | |
311 | return -ENXIO; | |
312 | } | |
313 | ||
314 | static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr) | |
315 | { | |
316 | int ret; | |
317 | ||
318 | switch (attr->group) { | |
319 | case KVM_S390_VM_MEM_CTRL: | |
320 | switch (attr->attr) { | |
321 | case KVM_S390_VM_MEM_ENABLE_CMMA: | |
322 | case KVM_S390_VM_MEM_CLR_CMMA: | |
323 | ret = 0; | |
324 | break; | |
325 | default: | |
326 | ret = -ENXIO; | |
327 | break; | |
328 | } | |
329 | break; | |
330 | default: | |
331 | ret = -ENXIO; | |
332 | break; | |
333 | } | |
334 | ||
335 | return ret; | |
336 | } | |
337 | ||
338 | long kvm_arch_vm_ioctl(struct file *filp, | |
339 | unsigned int ioctl, unsigned long arg) | |
340 | { | |
341 | struct kvm *kvm = filp->private_data; | |
342 | void __user *argp = (void __user *)arg; | |
343 | struct kvm_device_attr attr; | |
344 | int r; | |
345 | ||
346 | switch (ioctl) { | |
347 | case KVM_S390_INTERRUPT: { | |
348 | struct kvm_s390_interrupt s390int; | |
349 | ||
350 | r = -EFAULT; | |
351 | if (copy_from_user(&s390int, argp, sizeof(s390int))) | |
352 | break; | |
353 | r = kvm_s390_inject_vm(kvm, &s390int); | |
354 | break; | |
355 | } | |
356 | case KVM_ENABLE_CAP: { | |
357 | struct kvm_enable_cap cap; | |
358 | r = -EFAULT; | |
359 | if (copy_from_user(&cap, argp, sizeof(cap))) | |
360 | break; | |
361 | r = kvm_vm_ioctl_enable_cap(kvm, &cap); | |
362 | break; | |
363 | } | |
364 | case KVM_CREATE_IRQCHIP: { | |
365 | struct kvm_irq_routing_entry routing; | |
366 | ||
367 | r = -EINVAL; | |
368 | if (kvm->arch.use_irqchip) { | |
369 | /* Set up dummy routing. */ | |
370 | memset(&routing, 0, sizeof(routing)); | |
371 | kvm_set_irq_routing(kvm, &routing, 0, 0); | |
372 | r = 0; | |
373 | } | |
374 | break; | |
375 | } | |
376 | case KVM_SET_DEVICE_ATTR: { | |
377 | r = -EFAULT; | |
378 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
379 | break; | |
380 | r = kvm_s390_vm_set_attr(kvm, &attr); | |
381 | break; | |
382 | } | |
383 | case KVM_GET_DEVICE_ATTR: { | |
384 | r = -EFAULT; | |
385 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
386 | break; | |
387 | r = kvm_s390_vm_get_attr(kvm, &attr); | |
388 | break; | |
389 | } | |
390 | case KVM_HAS_DEVICE_ATTR: { | |
391 | r = -EFAULT; | |
392 | if (copy_from_user(&attr, (void __user *)arg, sizeof(attr))) | |
393 | break; | |
394 | r = kvm_s390_vm_has_attr(kvm, &attr); | |
395 | break; | |
396 | } | |
397 | default: | |
398 | r = -ENOTTY; | |
399 | } | |
400 | ||
401 | return r; | |
402 | } | |
403 | ||
404 | int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) | |
405 | { | |
406 | int rc; | |
407 | char debug_name[16]; | |
408 | static unsigned long sca_offset; | |
409 | ||
410 | rc = -EINVAL; | |
411 | #ifdef CONFIG_KVM_S390_UCONTROL | |
412 | if (type & ~KVM_VM_S390_UCONTROL) | |
413 | goto out_err; | |
414 | if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN))) | |
415 | goto out_err; | |
416 | #else | |
417 | if (type) | |
418 | goto out_err; | |
419 | #endif | |
420 | ||
421 | rc = s390_enable_sie(); | |
422 | if (rc) | |
423 | goto out_err; | |
424 | ||
425 | rc = -ENOMEM; | |
426 | ||
427 | kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL); | |
428 | if (!kvm->arch.sca) | |
429 | goto out_err; | |
430 | spin_lock(&kvm_lock); | |
431 | sca_offset = (sca_offset + 16) & 0x7f0; | |
432 | kvm->arch.sca = (struct sca_block *) ((char *) kvm->arch.sca + sca_offset); | |
433 | spin_unlock(&kvm_lock); | |
434 | ||
435 | sprintf(debug_name, "kvm-%u", current->pid); | |
436 | ||
437 | kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long)); | |
438 | if (!kvm->arch.dbf) | |
439 | goto out_nodbf; | |
440 | ||
441 | spin_lock_init(&kvm->arch.float_int.lock); | |
442 | INIT_LIST_HEAD(&kvm->arch.float_int.list); | |
443 | init_waitqueue_head(&kvm->arch.ipte_wq); | |
444 | ||
445 | debug_register_view(kvm->arch.dbf, &debug_sprintf_view); | |
446 | VM_EVENT(kvm, 3, "%s", "vm created"); | |
447 | ||
448 | if (type & KVM_VM_S390_UCONTROL) { | |
449 | kvm->arch.gmap = NULL; | |
450 | } else { | |
451 | kvm->arch.gmap = gmap_alloc(current->mm); | |
452 | if (!kvm->arch.gmap) | |
453 | goto out_nogmap; | |
454 | kvm->arch.gmap->private = kvm; | |
455 | kvm->arch.gmap->pfault_enabled = 0; | |
456 | } | |
457 | ||
458 | kvm->arch.css_support = 0; | |
459 | kvm->arch.use_irqchip = 0; | |
460 | ||
461 | spin_lock_init(&kvm->arch.start_stop_lock); | |
462 | ||
463 | return 0; | |
464 | out_nogmap: | |
465 | debug_unregister(kvm->arch.dbf); | |
466 | out_nodbf: | |
467 | free_page((unsigned long)(kvm->arch.sca)); | |
468 | out_err: | |
469 | return rc; | |
470 | } | |
471 | ||
472 | void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) | |
473 | { | |
474 | VCPU_EVENT(vcpu, 3, "%s", "free cpu"); | |
475 | trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id); | |
476 | kvm_s390_clear_local_irqs(vcpu); | |
477 | kvm_clear_async_pf_completion_queue(vcpu); | |
478 | if (!kvm_is_ucontrol(vcpu->kvm)) { | |
479 | clear_bit(63 - vcpu->vcpu_id, | |
480 | (unsigned long *) &vcpu->kvm->arch.sca->mcn); | |
481 | if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda == | |
482 | (__u64) vcpu->arch.sie_block) | |
483 | vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0; | |
484 | } | |
485 | smp_mb(); | |
486 | ||
487 | if (kvm_is_ucontrol(vcpu->kvm)) | |
488 | gmap_free(vcpu->arch.gmap); | |
489 | ||
490 | if (kvm_s390_cmma_enabled(vcpu->kvm)) | |
491 | kvm_s390_vcpu_unsetup_cmma(vcpu); | |
492 | free_page((unsigned long)(vcpu->arch.sie_block)); | |
493 | ||
494 | kvm_vcpu_uninit(vcpu); | |
495 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
496 | } | |
497 | ||
498 | static void kvm_free_vcpus(struct kvm *kvm) | |
499 | { | |
500 | unsigned int i; | |
501 | struct kvm_vcpu *vcpu; | |
502 | ||
503 | kvm_for_each_vcpu(i, vcpu, kvm) | |
504 | kvm_arch_vcpu_destroy(vcpu); | |
505 | ||
506 | mutex_lock(&kvm->lock); | |
507 | for (i = 0; i < atomic_read(&kvm->online_vcpus); i++) | |
508 | kvm->vcpus[i] = NULL; | |
509 | ||
510 | atomic_set(&kvm->online_vcpus, 0); | |
511 | mutex_unlock(&kvm->lock); | |
512 | } | |
513 | ||
514 | void kvm_arch_sync_events(struct kvm *kvm) | |
515 | { | |
516 | } | |
517 | ||
518 | void kvm_arch_destroy_vm(struct kvm *kvm) | |
519 | { | |
520 | kvm_free_vcpus(kvm); | |
521 | free_page((unsigned long)(kvm->arch.sca)); | |
522 | debug_unregister(kvm->arch.dbf); | |
523 | if (!kvm_is_ucontrol(kvm)) | |
524 | gmap_free(kvm->arch.gmap); | |
525 | kvm_s390_destroy_adapters(kvm); | |
526 | kvm_s390_clear_float_irqs(kvm); | |
527 | } | |
528 | ||
529 | /* Section: vcpu related */ | |
530 | int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) | |
531 | { | |
532 | vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; | |
533 | kvm_clear_async_pf_completion_queue(vcpu); | |
534 | if (kvm_is_ucontrol(vcpu->kvm)) { | |
535 | vcpu->arch.gmap = gmap_alloc(current->mm); | |
536 | if (!vcpu->arch.gmap) | |
537 | return -ENOMEM; | |
538 | vcpu->arch.gmap->private = vcpu->kvm; | |
539 | return 0; | |
540 | } | |
541 | ||
542 | vcpu->arch.gmap = vcpu->kvm->arch.gmap; | |
543 | vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX | | |
544 | KVM_SYNC_GPRS | | |
545 | KVM_SYNC_ACRS | | |
546 | KVM_SYNC_CRS; | |
547 | return 0; | |
548 | } | |
549 | ||
550 | void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) | |
551 | { | |
552 | /* Nothing todo */ | |
553 | } | |
554 | ||
555 | void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) | |
556 | { | |
557 | save_fp_ctl(&vcpu->arch.host_fpregs.fpc); | |
558 | save_fp_regs(vcpu->arch.host_fpregs.fprs); | |
559 | save_access_regs(vcpu->arch.host_acrs); | |
560 | restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc); | |
561 | restore_fp_regs(vcpu->arch.guest_fpregs.fprs); | |
562 | restore_access_regs(vcpu->run->s.regs.acrs); | |
563 | gmap_enable(vcpu->arch.gmap); | |
564 | atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); | |
565 | } | |
566 | ||
567 | void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) | |
568 | { | |
569 | atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags); | |
570 | gmap_disable(vcpu->arch.gmap); | |
571 | save_fp_ctl(&vcpu->arch.guest_fpregs.fpc); | |
572 | save_fp_regs(vcpu->arch.guest_fpregs.fprs); | |
573 | save_access_regs(vcpu->run->s.regs.acrs); | |
574 | restore_fp_ctl(&vcpu->arch.host_fpregs.fpc); | |
575 | restore_fp_regs(vcpu->arch.host_fpregs.fprs); | |
576 | restore_access_regs(vcpu->arch.host_acrs); | |
577 | } | |
578 | ||
579 | static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu) | |
580 | { | |
581 | /* this equals initial cpu reset in pop, but we don't switch to ESA */ | |
582 | vcpu->arch.sie_block->gpsw.mask = 0UL; | |
583 | vcpu->arch.sie_block->gpsw.addr = 0UL; | |
584 | kvm_s390_set_prefix(vcpu, 0); | |
585 | vcpu->arch.sie_block->cputm = 0UL; | |
586 | vcpu->arch.sie_block->ckc = 0UL; | |
587 | vcpu->arch.sie_block->todpr = 0; | |
588 | memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64)); | |
589 | vcpu->arch.sie_block->gcr[0] = 0xE0UL; | |
590 | vcpu->arch.sie_block->gcr[14] = 0xC2000000UL; | |
591 | vcpu->arch.guest_fpregs.fpc = 0; | |
592 | asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc)); | |
593 | vcpu->arch.sie_block->gbea = 1; | |
594 | vcpu->arch.sie_block->pp = 0; | |
595 | vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID; | |
596 | kvm_clear_async_pf_completion_queue(vcpu); | |
597 | kvm_s390_vcpu_stop(vcpu); | |
598 | kvm_s390_clear_local_irqs(vcpu); | |
599 | } | |
600 | ||
601 | int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu) | |
602 | { | |
603 | return 0; | |
604 | } | |
605 | ||
606 | void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu) | |
607 | { | |
608 | free_page(vcpu->arch.sie_block->cbrlo); | |
609 | vcpu->arch.sie_block->cbrlo = 0; | |
610 | } | |
611 | ||
612 | int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu) | |
613 | { | |
614 | vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL); | |
615 | if (!vcpu->arch.sie_block->cbrlo) | |
616 | return -ENOMEM; | |
617 | ||
618 | vcpu->arch.sie_block->ecb2 |= 0x80; | |
619 | vcpu->arch.sie_block->ecb2 &= ~0x08; | |
620 | return 0; | |
621 | } | |
622 | ||
623 | int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) | |
624 | { | |
625 | int rc = 0; | |
626 | ||
627 | atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH | | |
628 | CPUSTAT_SM | | |
629 | CPUSTAT_STOPPED | | |
630 | CPUSTAT_GED); | |
631 | vcpu->arch.sie_block->ecb = 6; | |
632 | if (test_vfacility(50) && test_vfacility(73)) | |
633 | vcpu->arch.sie_block->ecb |= 0x10; | |
634 | ||
635 | vcpu->arch.sie_block->ecb2 = 8; | |
636 | vcpu->arch.sie_block->eca = 0xC1002000U; | |
637 | if (sclp_has_siif()) | |
638 | vcpu->arch.sie_block->eca |= 1; | |
639 | vcpu->arch.sie_block->fac = (int) (long) vfacilities; | |
640 | vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; | |
641 | if (kvm_s390_cmma_enabled(vcpu->kvm)) { | |
642 | rc = kvm_s390_vcpu_setup_cmma(vcpu); | |
643 | if (rc) | |
644 | return rc; | |
645 | } | |
646 | hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS); | |
647 | tasklet_init(&vcpu->arch.tasklet, kvm_s390_tasklet, | |
648 | (unsigned long) vcpu); | |
649 | vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup; | |
650 | get_cpu_id(&vcpu->arch.cpu_id); | |
651 | vcpu->arch.cpu_id.version = 0xff; | |
652 | return rc; | |
653 | } | |
654 | ||
655 | struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, | |
656 | unsigned int id) | |
657 | { | |
658 | struct kvm_vcpu *vcpu; | |
659 | struct sie_page *sie_page; | |
660 | int rc = -EINVAL; | |
661 | ||
662 | if (id >= KVM_MAX_VCPUS) | |
663 | goto out; | |
664 | ||
665 | rc = -ENOMEM; | |
666 | ||
667 | vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); | |
668 | if (!vcpu) | |
669 | goto out; | |
670 | ||
671 | sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL); | |
672 | if (!sie_page) | |
673 | goto out_free_cpu; | |
674 | ||
675 | vcpu->arch.sie_block = &sie_page->sie_block; | |
676 | vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb; | |
677 | ||
678 | vcpu->arch.sie_block->icpua = id; | |
679 | if (!kvm_is_ucontrol(kvm)) { | |
680 | if (!kvm->arch.sca) { | |
681 | WARN_ON_ONCE(1); | |
682 | goto out_free_cpu; | |
683 | } | |
684 | if (!kvm->arch.sca->cpu[id].sda) | |
685 | kvm->arch.sca->cpu[id].sda = | |
686 | (__u64) vcpu->arch.sie_block; | |
687 | vcpu->arch.sie_block->scaoh = | |
688 | (__u32)(((__u64)kvm->arch.sca) >> 32); | |
689 | vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca; | |
690 | set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn); | |
691 | } | |
692 | ||
693 | spin_lock_init(&vcpu->arch.local_int.lock); | |
694 | INIT_LIST_HEAD(&vcpu->arch.local_int.list); | |
695 | vcpu->arch.local_int.float_int = &kvm->arch.float_int; | |
696 | vcpu->arch.local_int.wq = &vcpu->wq; | |
697 | vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags; | |
698 | ||
699 | rc = kvm_vcpu_init(vcpu, kvm, id); | |
700 | if (rc) | |
701 | goto out_free_sie_block; | |
702 | VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu, | |
703 | vcpu->arch.sie_block); | |
704 | trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block); | |
705 | ||
706 | return vcpu; | |
707 | out_free_sie_block: | |
708 | free_page((unsigned long)(vcpu->arch.sie_block)); | |
709 | out_free_cpu: | |
710 | kmem_cache_free(kvm_vcpu_cache, vcpu); | |
711 | out: | |
712 | return ERR_PTR(rc); | |
713 | } | |
714 | ||
715 | int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) | |
716 | { | |
717 | return kvm_cpu_has_interrupt(vcpu); | |
718 | } | |
719 | ||
720 | void s390_vcpu_block(struct kvm_vcpu *vcpu) | |
721 | { | |
722 | atomic_set_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); | |
723 | } | |
724 | ||
725 | void s390_vcpu_unblock(struct kvm_vcpu *vcpu) | |
726 | { | |
727 | atomic_clear_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20); | |
728 | } | |
729 | ||
730 | /* | |
731 | * Kick a guest cpu out of SIE and wait until SIE is not running. | |
732 | * If the CPU is not running (e.g. waiting as idle) the function will | |
733 | * return immediately. */ | |
734 | void exit_sie(struct kvm_vcpu *vcpu) | |
735 | { | |
736 | atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags); | |
737 | while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE) | |
738 | cpu_relax(); | |
739 | } | |
740 | ||
741 | /* Kick a guest cpu out of SIE and prevent SIE-reentry */ | |
742 | void exit_sie_sync(struct kvm_vcpu *vcpu) | |
743 | { | |
744 | s390_vcpu_block(vcpu); | |
745 | exit_sie(vcpu); | |
746 | } | |
747 | ||
748 | static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address) | |
749 | { | |
750 | int i; | |
751 | struct kvm *kvm = gmap->private; | |
752 | struct kvm_vcpu *vcpu; | |
753 | ||
754 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
755 | /* match against both prefix pages */ | |
756 | if (vcpu->arch.sie_block->prefix == (address & ~0x1000UL)) { | |
757 | VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address); | |
758 | kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu); | |
759 | exit_sie_sync(vcpu); | |
760 | } | |
761 | } | |
762 | } | |
763 | ||
764 | int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) | |
765 | { | |
766 | /* kvm common code refers to this, but never calls it */ | |
767 | BUG(); | |
768 | return 0; | |
769 | } | |
770 | ||
771 | static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, | |
772 | struct kvm_one_reg *reg) | |
773 | { | |
774 | int r = -EINVAL; | |
775 | ||
776 | switch (reg->id) { | |
777 | case KVM_REG_S390_TODPR: | |
778 | r = put_user(vcpu->arch.sie_block->todpr, | |
779 | (u32 __user *)reg->addr); | |
780 | break; | |
781 | case KVM_REG_S390_EPOCHDIFF: | |
782 | r = put_user(vcpu->arch.sie_block->epoch, | |
783 | (u64 __user *)reg->addr); | |
784 | break; | |
785 | case KVM_REG_S390_CPU_TIMER: | |
786 | r = put_user(vcpu->arch.sie_block->cputm, | |
787 | (u64 __user *)reg->addr); | |
788 | break; | |
789 | case KVM_REG_S390_CLOCK_COMP: | |
790 | r = put_user(vcpu->arch.sie_block->ckc, | |
791 | (u64 __user *)reg->addr); | |
792 | break; | |
793 | case KVM_REG_S390_PFTOKEN: | |
794 | r = put_user(vcpu->arch.pfault_token, | |
795 | (u64 __user *)reg->addr); | |
796 | break; | |
797 | case KVM_REG_S390_PFCOMPARE: | |
798 | r = put_user(vcpu->arch.pfault_compare, | |
799 | (u64 __user *)reg->addr); | |
800 | break; | |
801 | case KVM_REG_S390_PFSELECT: | |
802 | r = put_user(vcpu->arch.pfault_select, | |
803 | (u64 __user *)reg->addr); | |
804 | break; | |
805 | case KVM_REG_S390_PP: | |
806 | r = put_user(vcpu->arch.sie_block->pp, | |
807 | (u64 __user *)reg->addr); | |
808 | break; | |
809 | case KVM_REG_S390_GBEA: | |
810 | r = put_user(vcpu->arch.sie_block->gbea, | |
811 | (u64 __user *)reg->addr); | |
812 | break; | |
813 | default: | |
814 | break; | |
815 | } | |
816 | ||
817 | return r; | |
818 | } | |
819 | ||
820 | static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, | |
821 | struct kvm_one_reg *reg) | |
822 | { | |
823 | int r = -EINVAL; | |
824 | ||
825 | switch (reg->id) { | |
826 | case KVM_REG_S390_TODPR: | |
827 | r = get_user(vcpu->arch.sie_block->todpr, | |
828 | (u32 __user *)reg->addr); | |
829 | break; | |
830 | case KVM_REG_S390_EPOCHDIFF: | |
831 | r = get_user(vcpu->arch.sie_block->epoch, | |
832 | (u64 __user *)reg->addr); | |
833 | break; | |
834 | case KVM_REG_S390_CPU_TIMER: | |
835 | r = get_user(vcpu->arch.sie_block->cputm, | |
836 | (u64 __user *)reg->addr); | |
837 | break; | |
838 | case KVM_REG_S390_CLOCK_COMP: | |
839 | r = get_user(vcpu->arch.sie_block->ckc, | |
840 | (u64 __user *)reg->addr); | |
841 | break; | |
842 | case KVM_REG_S390_PFTOKEN: | |
843 | r = get_user(vcpu->arch.pfault_token, | |
844 | (u64 __user *)reg->addr); | |
845 | break; | |
846 | case KVM_REG_S390_PFCOMPARE: | |
847 | r = get_user(vcpu->arch.pfault_compare, | |
848 | (u64 __user *)reg->addr); | |
849 | break; | |
850 | case KVM_REG_S390_PFSELECT: | |
851 | r = get_user(vcpu->arch.pfault_select, | |
852 | (u64 __user *)reg->addr); | |
853 | break; | |
854 | case KVM_REG_S390_PP: | |
855 | r = get_user(vcpu->arch.sie_block->pp, | |
856 | (u64 __user *)reg->addr); | |
857 | break; | |
858 | case KVM_REG_S390_GBEA: | |
859 | r = get_user(vcpu->arch.sie_block->gbea, | |
860 | (u64 __user *)reg->addr); | |
861 | break; | |
862 | default: | |
863 | break; | |
864 | } | |
865 | ||
866 | return r; | |
867 | } | |
868 | ||
869 | static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) | |
870 | { | |
871 | kvm_s390_vcpu_initial_reset(vcpu); | |
872 | return 0; | |
873 | } | |
874 | ||
875 | int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
876 | { | |
877 | memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs)); | |
878 | return 0; | |
879 | } | |
880 | ||
881 | int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs) | |
882 | { | |
883 | memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs)); | |
884 | return 0; | |
885 | } | |
886 | ||
887 | int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, | |
888 | struct kvm_sregs *sregs) | |
889 | { | |
890 | memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs)); | |
891 | memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs)); | |
892 | restore_access_regs(vcpu->run->s.regs.acrs); | |
893 | return 0; | |
894 | } | |
895 | ||
896 | int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, | |
897 | struct kvm_sregs *sregs) | |
898 | { | |
899 | memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs)); | |
900 | memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs)); | |
901 | return 0; | |
902 | } | |
903 | ||
904 | int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
905 | { | |
906 | if (test_fp_ctl(fpu->fpc)) | |
907 | return -EINVAL; | |
908 | memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs)); | |
909 | vcpu->arch.guest_fpregs.fpc = fpu->fpc; | |
910 | restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc); | |
911 | restore_fp_regs(vcpu->arch.guest_fpregs.fprs); | |
912 | return 0; | |
913 | } | |
914 | ||
915 | int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) | |
916 | { | |
917 | memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs)); | |
918 | fpu->fpc = vcpu->arch.guest_fpregs.fpc; | |
919 | return 0; | |
920 | } | |
921 | ||
922 | static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw) | |
923 | { | |
924 | int rc = 0; | |
925 | ||
926 | if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED)) | |
927 | rc = -EBUSY; | |
928 | else { | |
929 | vcpu->run->psw_mask = psw.mask; | |
930 | vcpu->run->psw_addr = psw.addr; | |
931 | } | |
932 | return rc; | |
933 | } | |
934 | ||
935 | int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu, | |
936 | struct kvm_translation *tr) | |
937 | { | |
938 | return -EINVAL; /* not implemented yet */ | |
939 | } | |
940 | ||
941 | #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \ | |
942 | KVM_GUESTDBG_USE_HW_BP | \ | |
943 | KVM_GUESTDBG_ENABLE) | |
944 | ||
945 | int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu, | |
946 | struct kvm_guest_debug *dbg) | |
947 | { | |
948 | int rc = 0; | |
949 | ||
950 | vcpu->guest_debug = 0; | |
951 | kvm_s390_clear_bp_data(vcpu); | |
952 | ||
953 | if (vcpu->guest_debug & ~VALID_GUESTDBG_FLAGS) | |
954 | return -EINVAL; | |
955 | ||
956 | if (dbg->control & KVM_GUESTDBG_ENABLE) { | |
957 | vcpu->guest_debug = dbg->control; | |
958 | /* enforce guest PER */ | |
959 | atomic_set_mask(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); | |
960 | ||
961 | if (dbg->control & KVM_GUESTDBG_USE_HW_BP) | |
962 | rc = kvm_s390_import_bp_data(vcpu, dbg); | |
963 | } else { | |
964 | atomic_clear_mask(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); | |
965 | vcpu->arch.guestdbg.last_bp = 0; | |
966 | } | |
967 | ||
968 | if (rc) { | |
969 | vcpu->guest_debug = 0; | |
970 | kvm_s390_clear_bp_data(vcpu); | |
971 | atomic_clear_mask(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags); | |
972 | } | |
973 | ||
974 | return rc; | |
975 | } | |
976 | ||
977 | int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu, | |
978 | struct kvm_mp_state *mp_state) | |
979 | { | |
980 | return -EINVAL; /* not implemented yet */ | |
981 | } | |
982 | ||
983 | int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu, | |
984 | struct kvm_mp_state *mp_state) | |
985 | { | |
986 | return -EINVAL; /* not implemented yet */ | |
987 | } | |
988 | ||
989 | bool kvm_s390_cmma_enabled(struct kvm *kvm) | |
990 | { | |
991 | if (!MACHINE_IS_LPAR) | |
992 | return false; | |
993 | /* only enable for z10 and later */ | |
994 | if (!MACHINE_HAS_EDAT1) | |
995 | return false; | |
996 | if (!kvm->arch.use_cmma) | |
997 | return false; | |
998 | return true; | |
999 | } | |
1000 | ||
1001 | static bool ibs_enabled(struct kvm_vcpu *vcpu) | |
1002 | { | |
1003 | return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS; | |
1004 | } | |
1005 | ||
1006 | static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) | |
1007 | { | |
1008 | retry: | |
1009 | s390_vcpu_unblock(vcpu); | |
1010 | /* | |
1011 | * We use MMU_RELOAD just to re-arm the ipte notifier for the | |
1012 | * guest prefix page. gmap_ipte_notify will wait on the ptl lock. | |
1013 | * This ensures that the ipte instruction for this request has | |
1014 | * already finished. We might race against a second unmapper that | |
1015 | * wants to set the blocking bit. Lets just retry the request loop. | |
1016 | */ | |
1017 | if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) { | |
1018 | int rc; | |
1019 | rc = gmap_ipte_notify(vcpu->arch.gmap, | |
1020 | vcpu->arch.sie_block->prefix, | |
1021 | PAGE_SIZE * 2); | |
1022 | if (rc) | |
1023 | return rc; | |
1024 | goto retry; | |
1025 | } | |
1026 | ||
1027 | if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) { | |
1028 | if (!ibs_enabled(vcpu)) { | |
1029 | trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1); | |
1030 | atomic_set_mask(CPUSTAT_IBS, | |
1031 | &vcpu->arch.sie_block->cpuflags); | |
1032 | } | |
1033 | goto retry; | |
1034 | } | |
1035 | ||
1036 | if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) { | |
1037 | if (ibs_enabled(vcpu)) { | |
1038 | trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0); | |
1039 | atomic_clear_mask(CPUSTAT_IBS, | |
1040 | &vcpu->arch.sie_block->cpuflags); | |
1041 | } | |
1042 | goto retry; | |
1043 | } | |
1044 | ||
1045 | return 0; | |
1046 | } | |
1047 | ||
1048 | static long kvm_arch_fault_in_sync(struct kvm_vcpu *vcpu) | |
1049 | { | |
1050 | long rc; | |
1051 | hva_t fault = gmap_fault(current->thread.gmap_addr, vcpu->arch.gmap); | |
1052 | struct mm_struct *mm = current->mm; | |
1053 | down_read(&mm->mmap_sem); | |
1054 | rc = get_user_pages(current, mm, fault, 1, 1, 0, NULL, NULL); | |
1055 | up_read(&mm->mmap_sem); | |
1056 | return rc; | |
1057 | } | |
1058 | ||
1059 | static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token, | |
1060 | unsigned long token) | |
1061 | { | |
1062 | struct kvm_s390_interrupt inti; | |
1063 | inti.parm64 = token; | |
1064 | ||
1065 | if (start_token) { | |
1066 | inti.type = KVM_S390_INT_PFAULT_INIT; | |
1067 | WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &inti)); | |
1068 | } else { | |
1069 | inti.type = KVM_S390_INT_PFAULT_DONE; | |
1070 | WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti)); | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, | |
1075 | struct kvm_async_pf *work) | |
1076 | { | |
1077 | trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token); | |
1078 | __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token); | |
1079 | } | |
1080 | ||
1081 | void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, | |
1082 | struct kvm_async_pf *work) | |
1083 | { | |
1084 | trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token); | |
1085 | __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token); | |
1086 | } | |
1087 | ||
1088 | void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, | |
1089 | struct kvm_async_pf *work) | |
1090 | { | |
1091 | /* s390 will always inject the page directly */ | |
1092 | } | |
1093 | ||
1094 | bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu) | |
1095 | { | |
1096 | /* | |
1097 | * s390 will always inject the page directly, | |
1098 | * but we still want check_async_completion to cleanup | |
1099 | */ | |
1100 | return true; | |
1101 | } | |
1102 | ||
1103 | static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu) | |
1104 | { | |
1105 | hva_t hva; | |
1106 | struct kvm_arch_async_pf arch; | |
1107 | int rc; | |
1108 | ||
1109 | if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID) | |
1110 | return 0; | |
1111 | if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) != | |
1112 | vcpu->arch.pfault_compare) | |
1113 | return 0; | |
1114 | if (psw_extint_disabled(vcpu)) | |
1115 | return 0; | |
1116 | if (kvm_cpu_has_interrupt(vcpu)) | |
1117 | return 0; | |
1118 | if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul)) | |
1119 | return 0; | |
1120 | if (!vcpu->arch.gmap->pfault_enabled) | |
1121 | return 0; | |
1122 | ||
1123 | hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr)); | |
1124 | hva += current->thread.gmap_addr & ~PAGE_MASK; | |
1125 | if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8)) | |
1126 | return 0; | |
1127 | ||
1128 | rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch); | |
1129 | return rc; | |
1130 | } | |
1131 | ||
1132 | static int vcpu_pre_run(struct kvm_vcpu *vcpu) | |
1133 | { | |
1134 | int rc, cpuflags; | |
1135 | ||
1136 | /* | |
1137 | * On s390 notifications for arriving pages will be delivered directly | |
1138 | * to the guest but the house keeping for completed pfaults is | |
1139 | * handled outside the worker. | |
1140 | */ | |
1141 | kvm_check_async_pf_completion(vcpu); | |
1142 | ||
1143 | memcpy(&vcpu->arch.sie_block->gg14, &vcpu->run->s.regs.gprs[14], 16); | |
1144 | ||
1145 | if (need_resched()) | |
1146 | schedule(); | |
1147 | ||
1148 | if (test_thread_flag(TIF_MCCK_PENDING)) | |
1149 | s390_handle_mcck(); | |
1150 | ||
1151 | if (!kvm_is_ucontrol(vcpu->kvm)) | |
1152 | kvm_s390_deliver_pending_interrupts(vcpu); | |
1153 | ||
1154 | rc = kvm_s390_handle_requests(vcpu); | |
1155 | if (rc) | |
1156 | return rc; | |
1157 | ||
1158 | if (guestdbg_enabled(vcpu)) { | |
1159 | kvm_s390_backup_guest_per_regs(vcpu); | |
1160 | kvm_s390_patch_guest_per_regs(vcpu); | |
1161 | } | |
1162 | ||
1163 | vcpu->arch.sie_block->icptcode = 0; | |
1164 | cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags); | |
1165 | VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags); | |
1166 | trace_kvm_s390_sie_enter(vcpu, cpuflags); | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) | |
1172 | { | |
1173 | int rc = -1; | |
1174 | ||
1175 | VCPU_EVENT(vcpu, 6, "exit sie icptcode %d", | |
1176 | vcpu->arch.sie_block->icptcode); | |
1177 | trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode); | |
1178 | ||
1179 | if (guestdbg_enabled(vcpu)) | |
1180 | kvm_s390_restore_guest_per_regs(vcpu); | |
1181 | ||
1182 | if (exit_reason >= 0) { | |
1183 | rc = 0; | |
1184 | } else if (kvm_is_ucontrol(vcpu->kvm)) { | |
1185 | vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL; | |
1186 | vcpu->run->s390_ucontrol.trans_exc_code = | |
1187 | current->thread.gmap_addr; | |
1188 | vcpu->run->s390_ucontrol.pgm_code = 0x10; | |
1189 | rc = -EREMOTE; | |
1190 | ||
1191 | } else if (current->thread.gmap_pfault) { | |
1192 | trace_kvm_s390_major_guest_pfault(vcpu); | |
1193 | current->thread.gmap_pfault = 0; | |
1194 | if (kvm_arch_setup_async_pf(vcpu) || | |
1195 | (kvm_arch_fault_in_sync(vcpu) >= 0)) | |
1196 | rc = 0; | |
1197 | } | |
1198 | ||
1199 | if (rc == -1) { | |
1200 | VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction"); | |
1201 | trace_kvm_s390_sie_fault(vcpu); | |
1202 | rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); | |
1203 | } | |
1204 | ||
1205 | memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16); | |
1206 | ||
1207 | if (rc == 0) { | |
1208 | if (kvm_is_ucontrol(vcpu->kvm)) | |
1209 | /* Don't exit for host interrupts. */ | |
1210 | rc = vcpu->arch.sie_block->icptcode ? -EOPNOTSUPP : 0; | |
1211 | else | |
1212 | rc = kvm_handle_sie_intercept(vcpu); | |
1213 | } | |
1214 | ||
1215 | return rc; | |
1216 | } | |
1217 | ||
1218 | static int __vcpu_run(struct kvm_vcpu *vcpu) | |
1219 | { | |
1220 | int rc, exit_reason; | |
1221 | ||
1222 | /* | |
1223 | * We try to hold kvm->srcu during most of vcpu_run (except when run- | |
1224 | * ning the guest), so that memslots (and other stuff) are protected | |
1225 | */ | |
1226 | vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); | |
1227 | ||
1228 | do { | |
1229 | rc = vcpu_pre_run(vcpu); | |
1230 | if (rc) | |
1231 | break; | |
1232 | ||
1233 | srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); | |
1234 | /* | |
1235 | * As PF_VCPU will be used in fault handler, between | |
1236 | * guest_enter and guest_exit should be no uaccess. | |
1237 | */ | |
1238 | preempt_disable(); | |
1239 | kvm_guest_enter(); | |
1240 | preempt_enable(); | |
1241 | exit_reason = sie64a(vcpu->arch.sie_block, | |
1242 | vcpu->run->s.regs.gprs); | |
1243 | kvm_guest_exit(); | |
1244 | vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); | |
1245 | ||
1246 | rc = vcpu_post_run(vcpu, exit_reason); | |
1247 | } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc); | |
1248 | ||
1249 | srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); | |
1250 | return rc; | |
1251 | } | |
1252 | ||
1253 | int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) | |
1254 | { | |
1255 | int rc; | |
1256 | sigset_t sigsaved; | |
1257 | ||
1258 | if (guestdbg_exit_pending(vcpu)) { | |
1259 | kvm_s390_prepare_debug_exit(vcpu); | |
1260 | return 0; | |
1261 | } | |
1262 | ||
1263 | if (vcpu->sigset_active) | |
1264 | sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved); | |
1265 | ||
1266 | kvm_s390_vcpu_start(vcpu); | |
1267 | ||
1268 | switch (kvm_run->exit_reason) { | |
1269 | case KVM_EXIT_S390_SIEIC: | |
1270 | case KVM_EXIT_UNKNOWN: | |
1271 | case KVM_EXIT_INTR: | |
1272 | case KVM_EXIT_S390_RESET: | |
1273 | case KVM_EXIT_S390_UCONTROL: | |
1274 | case KVM_EXIT_S390_TSCH: | |
1275 | case KVM_EXIT_DEBUG: | |
1276 | break; | |
1277 | default: | |
1278 | BUG(); | |
1279 | } | |
1280 | ||
1281 | vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask; | |
1282 | vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr; | |
1283 | if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) { | |
1284 | kvm_run->kvm_dirty_regs &= ~KVM_SYNC_PREFIX; | |
1285 | kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); | |
1286 | } | |
1287 | if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) { | |
1288 | kvm_run->kvm_dirty_regs &= ~KVM_SYNC_CRS; | |
1289 | memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128); | |
1290 | kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix); | |
1291 | } | |
1292 | ||
1293 | might_fault(); | |
1294 | rc = __vcpu_run(vcpu); | |
1295 | ||
1296 | if (signal_pending(current) && !rc) { | |
1297 | kvm_run->exit_reason = KVM_EXIT_INTR; | |
1298 | rc = -EINTR; | |
1299 | } | |
1300 | ||
1301 | if (guestdbg_exit_pending(vcpu) && !rc) { | |
1302 | kvm_s390_prepare_debug_exit(vcpu); | |
1303 | rc = 0; | |
1304 | } | |
1305 | ||
1306 | if (rc == -EOPNOTSUPP) { | |
1307 | /* intercept cannot be handled in-kernel, prepare kvm-run */ | |
1308 | kvm_run->exit_reason = KVM_EXIT_S390_SIEIC; | |
1309 | kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode; | |
1310 | kvm_run->s390_sieic.ipa = vcpu->arch.sie_block->ipa; | |
1311 | kvm_run->s390_sieic.ipb = vcpu->arch.sie_block->ipb; | |
1312 | rc = 0; | |
1313 | } | |
1314 | ||
1315 | if (rc == -EREMOTE) { | |
1316 | /* intercept was handled, but userspace support is needed | |
1317 | * kvm_run has been prepared by the handler */ | |
1318 | rc = 0; | |
1319 | } | |
1320 | ||
1321 | kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask; | |
1322 | kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr; | |
1323 | kvm_run->s.regs.prefix = vcpu->arch.sie_block->prefix; | |
1324 | memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128); | |
1325 | ||
1326 | if (vcpu->sigset_active) | |
1327 | sigprocmask(SIG_SETMASK, &sigsaved, NULL); | |
1328 | ||
1329 | vcpu->stat.exit_userspace++; | |
1330 | return rc; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * store status at address | |
1335 | * we use have two special cases: | |
1336 | * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit | |
1337 | * KVM_S390_STORE_STATUS_PREFIXED: -> prefix | |
1338 | */ | |
1339 | int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa) | |
1340 | { | |
1341 | unsigned char archmode = 1; | |
1342 | u64 clkcomp; | |
1343 | int rc; | |
1344 | ||
1345 | if (gpa == KVM_S390_STORE_STATUS_NOADDR) { | |
1346 | if (write_guest_abs(vcpu, 163, &archmode, 1)) | |
1347 | return -EFAULT; | |
1348 | gpa = SAVE_AREA_BASE; | |
1349 | } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) { | |
1350 | if (write_guest_real(vcpu, 163, &archmode, 1)) | |
1351 | return -EFAULT; | |
1352 | gpa = kvm_s390_real_to_abs(vcpu, SAVE_AREA_BASE); | |
1353 | } | |
1354 | rc = write_guest_abs(vcpu, gpa + offsetof(struct save_area, fp_regs), | |
1355 | vcpu->arch.guest_fpregs.fprs, 128); | |
1356 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, gp_regs), | |
1357 | vcpu->run->s.regs.gprs, 128); | |
1358 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, psw), | |
1359 | &vcpu->arch.sie_block->gpsw, 16); | |
1360 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, pref_reg), | |
1361 | &vcpu->arch.sie_block->prefix, 4); | |
1362 | rc |= write_guest_abs(vcpu, | |
1363 | gpa + offsetof(struct save_area, fp_ctrl_reg), | |
1364 | &vcpu->arch.guest_fpregs.fpc, 4); | |
1365 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, tod_reg), | |
1366 | &vcpu->arch.sie_block->todpr, 4); | |
1367 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, timer), | |
1368 | &vcpu->arch.sie_block->cputm, 8); | |
1369 | clkcomp = vcpu->arch.sie_block->ckc >> 8; | |
1370 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, clk_cmp), | |
1371 | &clkcomp, 8); | |
1372 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, acc_regs), | |
1373 | &vcpu->run->s.regs.acrs, 64); | |
1374 | rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, ctrl_regs), | |
1375 | &vcpu->arch.sie_block->gcr, 128); | |
1376 | return rc ? -EFAULT : 0; | |
1377 | } | |
1378 | ||
1379 | int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr) | |
1380 | { | |
1381 | /* | |
1382 | * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy | |
1383 | * copying in vcpu load/put. Lets update our copies before we save | |
1384 | * it into the save area | |
1385 | */ | |
1386 | save_fp_ctl(&vcpu->arch.guest_fpregs.fpc); | |
1387 | save_fp_regs(vcpu->arch.guest_fpregs.fprs); | |
1388 | save_access_regs(vcpu->run->s.regs.acrs); | |
1389 | ||
1390 | return kvm_s390_store_status_unloaded(vcpu, addr); | |
1391 | } | |
1392 | ||
1393 | static inline int is_vcpu_stopped(struct kvm_vcpu *vcpu) | |
1394 | { | |
1395 | return atomic_read(&(vcpu)->arch.sie_block->cpuflags) & CPUSTAT_STOPPED; | |
1396 | } | |
1397 | ||
1398 | static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu) | |
1399 | { | |
1400 | kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu); | |
1401 | kvm_make_request(KVM_REQ_DISABLE_IBS, vcpu); | |
1402 | exit_sie_sync(vcpu); | |
1403 | } | |
1404 | ||
1405 | static void __disable_ibs_on_all_vcpus(struct kvm *kvm) | |
1406 | { | |
1407 | unsigned int i; | |
1408 | struct kvm_vcpu *vcpu; | |
1409 | ||
1410 | kvm_for_each_vcpu(i, vcpu, kvm) { | |
1411 | __disable_ibs_on_vcpu(vcpu); | |
1412 | } | |
1413 | } | |
1414 | ||
1415 | static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu) | |
1416 | { | |
1417 | kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu); | |
1418 | kvm_make_request(KVM_REQ_ENABLE_IBS, vcpu); | |
1419 | exit_sie_sync(vcpu); | |
1420 | } | |
1421 | ||
1422 | void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu) | |
1423 | { | |
1424 | int i, online_vcpus, started_vcpus = 0; | |
1425 | ||
1426 | if (!is_vcpu_stopped(vcpu)) | |
1427 | return; | |
1428 | ||
1429 | trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1); | |
1430 | /* Only one cpu at a time may enter/leave the STOPPED state. */ | |
1431 | spin_lock_bh(&vcpu->kvm->arch.start_stop_lock); | |
1432 | online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); | |
1433 | ||
1434 | for (i = 0; i < online_vcpus; i++) { | |
1435 | if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) | |
1436 | started_vcpus++; | |
1437 | } | |
1438 | ||
1439 | if (started_vcpus == 0) { | |
1440 | /* we're the only active VCPU -> speed it up */ | |
1441 | __enable_ibs_on_vcpu(vcpu); | |
1442 | } else if (started_vcpus == 1) { | |
1443 | /* | |
1444 | * As we are starting a second VCPU, we have to disable | |
1445 | * the IBS facility on all VCPUs to remove potentially | |
1446 | * oustanding ENABLE requests. | |
1447 | */ | |
1448 | __disable_ibs_on_all_vcpus(vcpu->kvm); | |
1449 | } | |
1450 | ||
1451 | atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags); | |
1452 | /* | |
1453 | * Another VCPU might have used IBS while we were offline. | |
1454 | * Let's play safe and flush the VCPU at startup. | |
1455 | */ | |
1456 | vcpu->arch.sie_block->ihcpu = 0xffff; | |
1457 | spin_unlock_bh(&vcpu->kvm->arch.start_stop_lock); | |
1458 | return; | |
1459 | } | |
1460 | ||
1461 | void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu) | |
1462 | { | |
1463 | int i, online_vcpus, started_vcpus = 0; | |
1464 | struct kvm_vcpu *started_vcpu = NULL; | |
1465 | ||
1466 | if (is_vcpu_stopped(vcpu)) | |
1467 | return; | |
1468 | ||
1469 | trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0); | |
1470 | /* Only one cpu at a time may enter/leave the STOPPED state. */ | |
1471 | spin_lock_bh(&vcpu->kvm->arch.start_stop_lock); | |
1472 | online_vcpus = atomic_read(&vcpu->kvm->online_vcpus); | |
1473 | ||
1474 | atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags); | |
1475 | __disable_ibs_on_vcpu(vcpu); | |
1476 | ||
1477 | for (i = 0; i < online_vcpus; i++) { | |
1478 | if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) { | |
1479 | started_vcpus++; | |
1480 | started_vcpu = vcpu->kvm->vcpus[i]; | |
1481 | } | |
1482 | } | |
1483 | ||
1484 | if (started_vcpus == 1) { | |
1485 | /* | |
1486 | * As we only have one VCPU left, we want to enable the | |
1487 | * IBS facility for that VCPU to speed it up. | |
1488 | */ | |
1489 | __enable_ibs_on_vcpu(started_vcpu); | |
1490 | } | |
1491 | ||
1492 | spin_unlock_bh(&vcpu->kvm->arch.start_stop_lock); | |
1493 | return; | |
1494 | } | |
1495 | ||
1496 | static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu, | |
1497 | struct kvm_enable_cap *cap) | |
1498 | { | |
1499 | int r; | |
1500 | ||
1501 | if (cap->flags) | |
1502 | return -EINVAL; | |
1503 | ||
1504 | switch (cap->cap) { | |
1505 | case KVM_CAP_S390_CSS_SUPPORT: | |
1506 | if (!vcpu->kvm->arch.css_support) { | |
1507 | vcpu->kvm->arch.css_support = 1; | |
1508 | trace_kvm_s390_enable_css(vcpu->kvm); | |
1509 | } | |
1510 | r = 0; | |
1511 | break; | |
1512 | default: | |
1513 | r = -EINVAL; | |
1514 | break; | |
1515 | } | |
1516 | return r; | |
1517 | } | |
1518 | ||
1519 | long kvm_arch_vcpu_ioctl(struct file *filp, | |
1520 | unsigned int ioctl, unsigned long arg) | |
1521 | { | |
1522 | struct kvm_vcpu *vcpu = filp->private_data; | |
1523 | void __user *argp = (void __user *)arg; | |
1524 | int idx; | |
1525 | long r; | |
1526 | ||
1527 | switch (ioctl) { | |
1528 | case KVM_S390_INTERRUPT: { | |
1529 | struct kvm_s390_interrupt s390int; | |
1530 | ||
1531 | r = -EFAULT; | |
1532 | if (copy_from_user(&s390int, argp, sizeof(s390int))) | |
1533 | break; | |
1534 | r = kvm_s390_inject_vcpu(vcpu, &s390int); | |
1535 | break; | |
1536 | } | |
1537 | case KVM_S390_STORE_STATUS: | |
1538 | idx = srcu_read_lock(&vcpu->kvm->srcu); | |
1539 | r = kvm_s390_vcpu_store_status(vcpu, arg); | |
1540 | srcu_read_unlock(&vcpu->kvm->srcu, idx); | |
1541 | break; | |
1542 | case KVM_S390_SET_INITIAL_PSW: { | |
1543 | psw_t psw; | |
1544 | ||
1545 | r = -EFAULT; | |
1546 | if (copy_from_user(&psw, argp, sizeof(psw))) | |
1547 | break; | |
1548 | r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw); | |
1549 | break; | |
1550 | } | |
1551 | case KVM_S390_INITIAL_RESET: | |
1552 | r = kvm_arch_vcpu_ioctl_initial_reset(vcpu); | |
1553 | break; | |
1554 | case KVM_SET_ONE_REG: | |
1555 | case KVM_GET_ONE_REG: { | |
1556 | struct kvm_one_reg reg; | |
1557 | r = -EFAULT; | |
1558 | if (copy_from_user(®, argp, sizeof(reg))) | |
1559 | break; | |
1560 | if (ioctl == KVM_SET_ONE_REG) | |
1561 | r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®); | |
1562 | else | |
1563 | r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®); | |
1564 | break; | |
1565 | } | |
1566 | #ifdef CONFIG_KVM_S390_UCONTROL | |
1567 | case KVM_S390_UCAS_MAP: { | |
1568 | struct kvm_s390_ucas_mapping ucasmap; | |
1569 | ||
1570 | if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { | |
1571 | r = -EFAULT; | |
1572 | break; | |
1573 | } | |
1574 | ||
1575 | if (!kvm_is_ucontrol(vcpu->kvm)) { | |
1576 | r = -EINVAL; | |
1577 | break; | |
1578 | } | |
1579 | ||
1580 | r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr, | |
1581 | ucasmap.vcpu_addr, ucasmap.length); | |
1582 | break; | |
1583 | } | |
1584 | case KVM_S390_UCAS_UNMAP: { | |
1585 | struct kvm_s390_ucas_mapping ucasmap; | |
1586 | ||
1587 | if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) { | |
1588 | r = -EFAULT; | |
1589 | break; | |
1590 | } | |
1591 | ||
1592 | if (!kvm_is_ucontrol(vcpu->kvm)) { | |
1593 | r = -EINVAL; | |
1594 | break; | |
1595 | } | |
1596 | ||
1597 | r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr, | |
1598 | ucasmap.length); | |
1599 | break; | |
1600 | } | |
1601 | #endif | |
1602 | case KVM_S390_VCPU_FAULT: { | |
1603 | r = gmap_fault(arg, vcpu->arch.gmap); | |
1604 | if (!IS_ERR_VALUE(r)) | |
1605 | r = 0; | |
1606 | break; | |
1607 | } | |
1608 | case KVM_ENABLE_CAP: | |
1609 | { | |
1610 | struct kvm_enable_cap cap; | |
1611 | r = -EFAULT; | |
1612 | if (copy_from_user(&cap, argp, sizeof(cap))) | |
1613 | break; | |
1614 | r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap); | |
1615 | break; | |
1616 | } | |
1617 | default: | |
1618 | r = -ENOTTY; | |
1619 | } | |
1620 | return r; | |
1621 | } | |
1622 | ||
1623 | int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf) | |
1624 | { | |
1625 | #ifdef CONFIG_KVM_S390_UCONTROL | |
1626 | if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET) | |
1627 | && (kvm_is_ucontrol(vcpu->kvm))) { | |
1628 | vmf->page = virt_to_page(vcpu->arch.sie_block); | |
1629 | get_page(vmf->page); | |
1630 | return 0; | |
1631 | } | |
1632 | #endif | |
1633 | return VM_FAULT_SIGBUS; | |
1634 | } | |
1635 | ||
1636 | void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free, | |
1637 | struct kvm_memory_slot *dont) | |
1638 | { | |
1639 | } | |
1640 | ||
1641 | int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot, | |
1642 | unsigned long npages) | |
1643 | { | |
1644 | return 0; | |
1645 | } | |
1646 | ||
1647 | void kvm_arch_memslots_updated(struct kvm *kvm) | |
1648 | { | |
1649 | } | |
1650 | ||
1651 | /* Section: memory related */ | |
1652 | int kvm_arch_prepare_memory_region(struct kvm *kvm, | |
1653 | struct kvm_memory_slot *memslot, | |
1654 | struct kvm_userspace_memory_region *mem, | |
1655 | enum kvm_mr_change change) | |
1656 | { | |
1657 | /* A few sanity checks. We can have memory slots which have to be | |
1658 | located/ended at a segment boundary (1MB). The memory in userland is | |
1659 | ok to be fragmented into various different vmas. It is okay to mmap() | |
1660 | and munmap() stuff in this slot after doing this call at any time */ | |
1661 | ||
1662 | if (mem->userspace_addr & 0xffffful) | |
1663 | return -EINVAL; | |
1664 | ||
1665 | if (mem->memory_size & 0xffffful) | |
1666 | return -EINVAL; | |
1667 | ||
1668 | return 0; | |
1669 | } | |
1670 | ||
1671 | void kvm_arch_commit_memory_region(struct kvm *kvm, | |
1672 | struct kvm_userspace_memory_region *mem, | |
1673 | const struct kvm_memory_slot *old, | |
1674 | enum kvm_mr_change change) | |
1675 | { | |
1676 | int rc; | |
1677 | ||
1678 | /* If the basics of the memslot do not change, we do not want | |
1679 | * to update the gmap. Every update causes several unnecessary | |
1680 | * segment translation exceptions. This is usually handled just | |
1681 | * fine by the normal fault handler + gmap, but it will also | |
1682 | * cause faults on the prefix page of running guest CPUs. | |
1683 | */ | |
1684 | if (old->userspace_addr == mem->userspace_addr && | |
1685 | old->base_gfn * PAGE_SIZE == mem->guest_phys_addr && | |
1686 | old->npages * PAGE_SIZE == mem->memory_size) | |
1687 | return; | |
1688 | ||
1689 | rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr, | |
1690 | mem->guest_phys_addr, mem->memory_size); | |
1691 | if (rc) | |
1692 | printk(KERN_WARNING "kvm-s390: failed to commit memory region\n"); | |
1693 | return; | |
1694 | } | |
1695 | ||
1696 | void kvm_arch_flush_shadow_all(struct kvm *kvm) | |
1697 | { | |
1698 | } | |
1699 | ||
1700 | void kvm_arch_flush_shadow_memslot(struct kvm *kvm, | |
1701 | struct kvm_memory_slot *slot) | |
1702 | { | |
1703 | } | |
1704 | ||
1705 | static int __init kvm_s390_init(void) | |
1706 | { | |
1707 | int ret; | |
1708 | ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE); | |
1709 | if (ret) | |
1710 | return ret; | |
1711 | ||
1712 | /* | |
1713 | * guests can ask for up to 255+1 double words, we need a full page | |
1714 | * to hold the maximum amount of facilities. On the other hand, we | |
1715 | * only set facilities that are known to work in KVM. | |
1716 | */ | |
1717 | vfacilities = (unsigned long *) get_zeroed_page(GFP_KERNEL|GFP_DMA); | |
1718 | if (!vfacilities) { | |
1719 | kvm_exit(); | |
1720 | return -ENOMEM; | |
1721 | } | |
1722 | memcpy(vfacilities, S390_lowcore.stfle_fac_list, 16); | |
1723 | vfacilities[0] &= 0xff82fff3f4fc2000UL; | |
1724 | vfacilities[1] &= 0x005c000000000000UL; | |
1725 | return 0; | |
1726 | } | |
1727 | ||
1728 | static void __exit kvm_s390_exit(void) | |
1729 | { | |
1730 | free_page((unsigned long) vfacilities); | |
1731 | kvm_exit(); | |
1732 | } | |
1733 | ||
1734 | module_init(kvm_s390_init); | |
1735 | module_exit(kvm_s390_exit); | |
1736 | ||
1737 | /* | |
1738 | * Enable autoloading of the kvm module. | |
1739 | * Note that we add the module alias here instead of virt/kvm/kvm_main.c | |
1740 | * since x86 takes a different approach. | |
1741 | */ | |
1742 | #include <linux/miscdevice.h> | |
1743 | MODULE_ALIAS_MISCDEV(KVM_MINOR); | |
1744 | MODULE_ALIAS("devname:kvm"); |