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Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / arch / s390 / kvm / kvm-s390.c
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/random.h>
26 #include <linux/slab.h>
27 #include <linux/timer.h>
28 #include <linux/vmalloc.h>
29 #include <asm/asm-offsets.h>
30 #include <asm/lowcore.h>
31 #include <asm/etr.h>
32 #include <asm/pgtable.h>
33 #include <asm/gmap.h>
34 #include <asm/nmi.h>
35 #include <asm/switch_to.h>
36 #include <asm/isc.h>
37 #include <asm/sclp.h>
38 #include "kvm-s390.h"
39 #include "gaccess.h"
40
41 #define KMSG_COMPONENT "kvm-s390"
42 #undef pr_fmt
43 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
44
45 #define CREATE_TRACE_POINTS
46 #include "trace.h"
47 #include "trace-s390.h"
48
49 #define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */
50 #define LOCAL_IRQS 32
51 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
52 (KVM_MAX_VCPUS + LOCAL_IRQS))
53
54 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
55
56 struct kvm_stats_debugfs_item debugfs_entries[] = {
57 { "userspace_handled", VCPU_STAT(exit_userspace) },
58 { "exit_null", VCPU_STAT(exit_null) },
59 { "exit_validity", VCPU_STAT(exit_validity) },
60 { "exit_stop_request", VCPU_STAT(exit_stop_request) },
61 { "exit_external_request", VCPU_STAT(exit_external_request) },
62 { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
63 { "exit_instruction", VCPU_STAT(exit_instruction) },
64 { "exit_pei", VCPU_STAT(exit_pei) },
65 { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
66 { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
67 { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
68 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
69 { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
70 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
71 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
72 { "instruction_lctl", VCPU_STAT(instruction_lctl) },
73 { "instruction_stctl", VCPU_STAT(instruction_stctl) },
74 { "instruction_stctg", VCPU_STAT(instruction_stctg) },
75 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
76 { "deliver_external_call", VCPU_STAT(deliver_external_call) },
77 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
78 { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
79 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
80 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
81 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
82 { "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
83 { "exit_wait_state", VCPU_STAT(exit_wait_state) },
84 { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
85 { "instruction_stidp", VCPU_STAT(instruction_stidp) },
86 { "instruction_spx", VCPU_STAT(instruction_spx) },
87 { "instruction_stpx", VCPU_STAT(instruction_stpx) },
88 { "instruction_stap", VCPU_STAT(instruction_stap) },
89 { "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
90 { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) },
91 { "instruction_stsch", VCPU_STAT(instruction_stsch) },
92 { "instruction_chsc", VCPU_STAT(instruction_chsc) },
93 { "instruction_essa", VCPU_STAT(instruction_essa) },
94 { "instruction_stsi", VCPU_STAT(instruction_stsi) },
95 { "instruction_stfl", VCPU_STAT(instruction_stfl) },
96 { "instruction_tprot", VCPU_STAT(instruction_tprot) },
97 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
98 { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
99 { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
100 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
101 { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) },
102 { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) },
103 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
104 { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) },
105 { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) },
106 { "instruction_sigp_store_adtl_status", VCPU_STAT(instruction_sigp_store_adtl_status) },
107 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
108 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
109 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
110 { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) },
111 { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) },
112 { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) },
113 { "diagnose_10", VCPU_STAT(diagnose_10) },
114 { "diagnose_44", VCPU_STAT(diagnose_44) },
115 { "diagnose_9c", VCPU_STAT(diagnose_9c) },
116 { "diagnose_258", VCPU_STAT(diagnose_258) },
117 { "diagnose_308", VCPU_STAT(diagnose_308) },
118 { "diagnose_500", VCPU_STAT(diagnose_500) },
119 { NULL }
120 };
121
122 /* upper facilities limit for kvm */
123 unsigned long kvm_s390_fac_list_mask[16] = {
124 0xffe6000000000000UL,
125 0x005e000000000000UL,
126 };
127
128 unsigned long kvm_s390_fac_list_mask_size(void)
129 {
130 BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) > S390_ARCH_FAC_MASK_SIZE_U64);
131 return ARRAY_SIZE(kvm_s390_fac_list_mask);
132 }
133
134 static struct gmap_notifier gmap_notifier;
135 debug_info_t *kvm_s390_dbf;
136
137 /* Section: not file related */
138 int kvm_arch_hardware_enable(void)
139 {
140 /* every s390 is virtualization enabled ;-) */
141 return 0;
142 }
143
144 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address);
145
146 /*
147 * This callback is executed during stop_machine(). All CPUs are therefore
148 * temporarily stopped. In order not to change guest behavior, we have to
149 * disable preemption whenever we touch the epoch of kvm and the VCPUs,
150 * so a CPU won't be stopped while calculating with the epoch.
151 */
152 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
153 void *v)
154 {
155 struct kvm *kvm;
156 struct kvm_vcpu *vcpu;
157 int i;
158 unsigned long long *delta = v;
159
160 list_for_each_entry(kvm, &vm_list, vm_list) {
161 kvm->arch.epoch -= *delta;
162 kvm_for_each_vcpu(i, vcpu, kvm) {
163 vcpu->arch.sie_block->epoch -= *delta;
164 if (vcpu->arch.cputm_enabled)
165 vcpu->arch.cputm_start += *delta;
166 }
167 }
168 return NOTIFY_OK;
169 }
170
171 static struct notifier_block kvm_clock_notifier = {
172 .notifier_call = kvm_clock_sync,
173 };
174
175 int kvm_arch_hardware_setup(void)
176 {
177 gmap_notifier.notifier_call = kvm_gmap_notifier;
178 gmap_register_ipte_notifier(&gmap_notifier);
179 atomic_notifier_chain_register(&s390_epoch_delta_notifier,
180 &kvm_clock_notifier);
181 return 0;
182 }
183
184 void kvm_arch_hardware_unsetup(void)
185 {
186 gmap_unregister_ipte_notifier(&gmap_notifier);
187 atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
188 &kvm_clock_notifier);
189 }
190
191 int kvm_arch_init(void *opaque)
192 {
193 kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
194 if (!kvm_s390_dbf)
195 return -ENOMEM;
196
197 if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view)) {
198 debug_unregister(kvm_s390_dbf);
199 return -ENOMEM;
200 }
201
202 /* Register floating interrupt controller interface. */
203 return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
204 }
205
206 void kvm_arch_exit(void)
207 {
208 debug_unregister(kvm_s390_dbf);
209 }
210
211 /* Section: device related */
212 long kvm_arch_dev_ioctl(struct file *filp,
213 unsigned int ioctl, unsigned long arg)
214 {
215 if (ioctl == KVM_S390_ENABLE_SIE)
216 return s390_enable_sie();
217 return -EINVAL;
218 }
219
220 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
221 {
222 int r;
223
224 switch (ext) {
225 case KVM_CAP_S390_PSW:
226 case KVM_CAP_S390_GMAP:
227 case KVM_CAP_SYNC_MMU:
228 #ifdef CONFIG_KVM_S390_UCONTROL
229 case KVM_CAP_S390_UCONTROL:
230 #endif
231 case KVM_CAP_ASYNC_PF:
232 case KVM_CAP_SYNC_REGS:
233 case KVM_CAP_ONE_REG:
234 case KVM_CAP_ENABLE_CAP:
235 case KVM_CAP_S390_CSS_SUPPORT:
236 case KVM_CAP_IOEVENTFD:
237 case KVM_CAP_DEVICE_CTRL:
238 case KVM_CAP_ENABLE_CAP_VM:
239 case KVM_CAP_S390_IRQCHIP:
240 case KVM_CAP_VM_ATTRIBUTES:
241 case KVM_CAP_MP_STATE:
242 case KVM_CAP_S390_INJECT_IRQ:
243 case KVM_CAP_S390_USER_SIGP:
244 case KVM_CAP_S390_USER_STSI:
245 case KVM_CAP_S390_SKEYS:
246 case KVM_CAP_S390_IRQ_STATE:
247 r = 1;
248 break;
249 case KVM_CAP_S390_MEM_OP:
250 r = MEM_OP_MAX_SIZE;
251 break;
252 case KVM_CAP_NR_VCPUS:
253 case KVM_CAP_MAX_VCPUS:
254 r = sclp.has_esca ? KVM_S390_ESCA_CPU_SLOTS
255 : KVM_S390_BSCA_CPU_SLOTS;
256 break;
257 case KVM_CAP_NR_MEMSLOTS:
258 r = KVM_USER_MEM_SLOTS;
259 break;
260 case KVM_CAP_S390_COW:
261 r = MACHINE_HAS_ESOP;
262 break;
263 case KVM_CAP_S390_VECTOR_REGISTERS:
264 r = MACHINE_HAS_VX;
265 break;
266 case KVM_CAP_S390_RI:
267 r = test_facility(64);
268 break;
269 default:
270 r = 0;
271 }
272 return r;
273 }
274
275 static void kvm_s390_sync_dirty_log(struct kvm *kvm,
276 struct kvm_memory_slot *memslot)
277 {
278 gfn_t cur_gfn, last_gfn;
279 unsigned long address;
280 struct gmap *gmap = kvm->arch.gmap;
281
282 /* Loop over all guest pages */
283 last_gfn = memslot->base_gfn + memslot->npages;
284 for (cur_gfn = memslot->base_gfn; cur_gfn <= last_gfn; cur_gfn++) {
285 address = gfn_to_hva_memslot(memslot, cur_gfn);
286
287 if (test_and_clear_guest_dirty(gmap->mm, address))
288 mark_page_dirty(kvm, cur_gfn);
289 if (fatal_signal_pending(current))
290 return;
291 cond_resched();
292 }
293 }
294
295 /* Section: vm related */
296 static void sca_del_vcpu(struct kvm_vcpu *vcpu);
297
298 /*
299 * Get (and clear) the dirty memory log for a memory slot.
300 */
301 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
302 struct kvm_dirty_log *log)
303 {
304 int r;
305 unsigned long n;
306 struct kvm_memslots *slots;
307 struct kvm_memory_slot *memslot;
308 int is_dirty = 0;
309
310 mutex_lock(&kvm->slots_lock);
311
312 r = -EINVAL;
313 if (log->slot >= KVM_USER_MEM_SLOTS)
314 goto out;
315
316 slots = kvm_memslots(kvm);
317 memslot = id_to_memslot(slots, log->slot);
318 r = -ENOENT;
319 if (!memslot->dirty_bitmap)
320 goto out;
321
322 kvm_s390_sync_dirty_log(kvm, memslot);
323 r = kvm_get_dirty_log(kvm, log, &is_dirty);
324 if (r)
325 goto out;
326
327 /* Clear the dirty log */
328 if (is_dirty) {
329 n = kvm_dirty_bitmap_bytes(memslot);
330 memset(memslot->dirty_bitmap, 0, n);
331 }
332 r = 0;
333 out:
334 mutex_unlock(&kvm->slots_lock);
335 return r;
336 }
337
338 static int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
339 {
340 int r;
341
342 if (cap->flags)
343 return -EINVAL;
344
345 switch (cap->cap) {
346 case KVM_CAP_S390_IRQCHIP:
347 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
348 kvm->arch.use_irqchip = 1;
349 r = 0;
350 break;
351 case KVM_CAP_S390_USER_SIGP:
352 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
353 kvm->arch.user_sigp = 1;
354 r = 0;
355 break;
356 case KVM_CAP_S390_VECTOR_REGISTERS:
357 mutex_lock(&kvm->lock);
358 if (atomic_read(&kvm->online_vcpus)) {
359 r = -EBUSY;
360 } else if (MACHINE_HAS_VX) {
361 set_kvm_facility(kvm->arch.model.fac_mask, 129);
362 set_kvm_facility(kvm->arch.model.fac_list, 129);
363 r = 0;
364 } else
365 r = -EINVAL;
366 mutex_unlock(&kvm->lock);
367 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
368 r ? "(not available)" : "(success)");
369 break;
370 case KVM_CAP_S390_RI:
371 r = -EINVAL;
372 mutex_lock(&kvm->lock);
373 if (atomic_read(&kvm->online_vcpus)) {
374 r = -EBUSY;
375 } else if (test_facility(64)) {
376 set_kvm_facility(kvm->arch.model.fac_mask, 64);
377 set_kvm_facility(kvm->arch.model.fac_list, 64);
378 r = 0;
379 }
380 mutex_unlock(&kvm->lock);
381 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
382 r ? "(not available)" : "(success)");
383 break;
384 case KVM_CAP_S390_USER_STSI:
385 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
386 kvm->arch.user_stsi = 1;
387 r = 0;
388 break;
389 default:
390 r = -EINVAL;
391 break;
392 }
393 return r;
394 }
395
396 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
397 {
398 int ret;
399
400 switch (attr->attr) {
401 case KVM_S390_VM_MEM_LIMIT_SIZE:
402 ret = 0;
403 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
404 kvm->arch.mem_limit);
405 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
406 ret = -EFAULT;
407 break;
408 default:
409 ret = -ENXIO;
410 break;
411 }
412 return ret;
413 }
414
415 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
416 {
417 int ret;
418 unsigned int idx;
419 switch (attr->attr) {
420 case KVM_S390_VM_MEM_ENABLE_CMMA:
421 /* enable CMMA only for z10 and later (EDAT_1) */
422 ret = -EINVAL;
423 if (!MACHINE_IS_LPAR || !MACHINE_HAS_EDAT1)
424 break;
425
426 ret = -EBUSY;
427 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
428 mutex_lock(&kvm->lock);
429 if (atomic_read(&kvm->online_vcpus) == 0) {
430 kvm->arch.use_cmma = 1;
431 ret = 0;
432 }
433 mutex_unlock(&kvm->lock);
434 break;
435 case KVM_S390_VM_MEM_CLR_CMMA:
436 ret = -EINVAL;
437 if (!kvm->arch.use_cmma)
438 break;
439
440 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
441 mutex_lock(&kvm->lock);
442 idx = srcu_read_lock(&kvm->srcu);
443 s390_reset_cmma(kvm->arch.gmap->mm);
444 srcu_read_unlock(&kvm->srcu, idx);
445 mutex_unlock(&kvm->lock);
446 ret = 0;
447 break;
448 case KVM_S390_VM_MEM_LIMIT_SIZE: {
449 unsigned long new_limit;
450
451 if (kvm_is_ucontrol(kvm))
452 return -EINVAL;
453
454 if (get_user(new_limit, (u64 __user *)attr->addr))
455 return -EFAULT;
456
457 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
458 new_limit > kvm->arch.mem_limit)
459 return -E2BIG;
460
461 if (!new_limit)
462 return -EINVAL;
463
464 /* gmap_alloc takes last usable address */
465 if (new_limit != KVM_S390_NO_MEM_LIMIT)
466 new_limit -= 1;
467
468 ret = -EBUSY;
469 mutex_lock(&kvm->lock);
470 if (atomic_read(&kvm->online_vcpus) == 0) {
471 /* gmap_alloc will round the limit up */
472 struct gmap *new = gmap_alloc(current->mm, new_limit);
473
474 if (!new) {
475 ret = -ENOMEM;
476 } else {
477 gmap_free(kvm->arch.gmap);
478 new->private = kvm;
479 kvm->arch.gmap = new;
480 ret = 0;
481 }
482 }
483 mutex_unlock(&kvm->lock);
484 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
485 VM_EVENT(kvm, 3, "New guest asce: 0x%pK",
486 (void *) kvm->arch.gmap->asce);
487 break;
488 }
489 default:
490 ret = -ENXIO;
491 break;
492 }
493 return ret;
494 }
495
496 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
497
498 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
499 {
500 struct kvm_vcpu *vcpu;
501 int i;
502
503 if (!test_kvm_facility(kvm, 76))
504 return -EINVAL;
505
506 mutex_lock(&kvm->lock);
507 switch (attr->attr) {
508 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
509 get_random_bytes(
510 kvm->arch.crypto.crycb->aes_wrapping_key_mask,
511 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
512 kvm->arch.crypto.aes_kw = 1;
513 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
514 break;
515 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
516 get_random_bytes(
517 kvm->arch.crypto.crycb->dea_wrapping_key_mask,
518 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
519 kvm->arch.crypto.dea_kw = 1;
520 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
521 break;
522 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
523 kvm->arch.crypto.aes_kw = 0;
524 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
525 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
526 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
527 break;
528 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
529 kvm->arch.crypto.dea_kw = 0;
530 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
531 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
532 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
533 break;
534 default:
535 mutex_unlock(&kvm->lock);
536 return -ENXIO;
537 }
538
539 kvm_for_each_vcpu(i, vcpu, kvm) {
540 kvm_s390_vcpu_crypto_setup(vcpu);
541 exit_sie(vcpu);
542 }
543 mutex_unlock(&kvm->lock);
544 return 0;
545 }
546
547 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
548 {
549 u8 gtod_high;
550
551 if (copy_from_user(&gtod_high, (void __user *)attr->addr,
552 sizeof(gtod_high)))
553 return -EFAULT;
554
555 if (gtod_high != 0)
556 return -EINVAL;
557 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
558
559 return 0;
560 }
561
562 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
563 {
564 u64 gtod;
565
566 if (copy_from_user(&gtod, (void __user *)attr->addr, sizeof(gtod)))
567 return -EFAULT;
568
569 kvm_s390_set_tod_clock(kvm, gtod);
570 VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod);
571 return 0;
572 }
573
574 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
575 {
576 int ret;
577
578 if (attr->flags)
579 return -EINVAL;
580
581 switch (attr->attr) {
582 case KVM_S390_VM_TOD_HIGH:
583 ret = kvm_s390_set_tod_high(kvm, attr);
584 break;
585 case KVM_S390_VM_TOD_LOW:
586 ret = kvm_s390_set_tod_low(kvm, attr);
587 break;
588 default:
589 ret = -ENXIO;
590 break;
591 }
592 return ret;
593 }
594
595 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
596 {
597 u8 gtod_high = 0;
598
599 if (copy_to_user((void __user *)attr->addr, &gtod_high,
600 sizeof(gtod_high)))
601 return -EFAULT;
602 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
603
604 return 0;
605 }
606
607 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
608 {
609 u64 gtod;
610
611 gtod = kvm_s390_get_tod_clock_fast(kvm);
612 if (copy_to_user((void __user *)attr->addr, &gtod, sizeof(gtod)))
613 return -EFAULT;
614 VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
615
616 return 0;
617 }
618
619 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
620 {
621 int ret;
622
623 if (attr->flags)
624 return -EINVAL;
625
626 switch (attr->attr) {
627 case KVM_S390_VM_TOD_HIGH:
628 ret = kvm_s390_get_tod_high(kvm, attr);
629 break;
630 case KVM_S390_VM_TOD_LOW:
631 ret = kvm_s390_get_tod_low(kvm, attr);
632 break;
633 default:
634 ret = -ENXIO;
635 break;
636 }
637 return ret;
638 }
639
640 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
641 {
642 struct kvm_s390_vm_cpu_processor *proc;
643 u16 lowest_ibc, unblocked_ibc;
644 int ret = 0;
645
646 mutex_lock(&kvm->lock);
647 if (atomic_read(&kvm->online_vcpus)) {
648 ret = -EBUSY;
649 goto out;
650 }
651 proc = kzalloc(sizeof(*proc), GFP_KERNEL);
652 if (!proc) {
653 ret = -ENOMEM;
654 goto out;
655 }
656 if (!copy_from_user(proc, (void __user *)attr->addr,
657 sizeof(*proc))) {
658 kvm->arch.model.cpuid = proc->cpuid;
659 lowest_ibc = sclp.ibc >> 16 & 0xfff;
660 unblocked_ibc = sclp.ibc & 0xfff;
661 if (lowest_ibc && proc->ibc) {
662 if (proc->ibc > unblocked_ibc)
663 kvm->arch.model.ibc = unblocked_ibc;
664 else if (proc->ibc < lowest_ibc)
665 kvm->arch.model.ibc = lowest_ibc;
666 else
667 kvm->arch.model.ibc = proc->ibc;
668 }
669 memcpy(kvm->arch.model.fac_list, proc->fac_list,
670 S390_ARCH_FAC_LIST_SIZE_BYTE);
671 } else
672 ret = -EFAULT;
673 kfree(proc);
674 out:
675 mutex_unlock(&kvm->lock);
676 return ret;
677 }
678
679 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
680 {
681 int ret = -ENXIO;
682
683 switch (attr->attr) {
684 case KVM_S390_VM_CPU_PROCESSOR:
685 ret = kvm_s390_set_processor(kvm, attr);
686 break;
687 }
688 return ret;
689 }
690
691 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
692 {
693 struct kvm_s390_vm_cpu_processor *proc;
694 int ret = 0;
695
696 proc = kzalloc(sizeof(*proc), GFP_KERNEL);
697 if (!proc) {
698 ret = -ENOMEM;
699 goto out;
700 }
701 proc->cpuid = kvm->arch.model.cpuid;
702 proc->ibc = kvm->arch.model.ibc;
703 memcpy(&proc->fac_list, kvm->arch.model.fac_list,
704 S390_ARCH_FAC_LIST_SIZE_BYTE);
705 if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
706 ret = -EFAULT;
707 kfree(proc);
708 out:
709 return ret;
710 }
711
712 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
713 {
714 struct kvm_s390_vm_cpu_machine *mach;
715 int ret = 0;
716
717 mach = kzalloc(sizeof(*mach), GFP_KERNEL);
718 if (!mach) {
719 ret = -ENOMEM;
720 goto out;
721 }
722 get_cpu_id((struct cpuid *) &mach->cpuid);
723 mach->ibc = sclp.ibc;
724 memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
725 S390_ARCH_FAC_LIST_SIZE_BYTE);
726 memcpy((unsigned long *)&mach->fac_list, S390_lowcore.stfle_fac_list,
727 S390_ARCH_FAC_LIST_SIZE_BYTE);
728 if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
729 ret = -EFAULT;
730 kfree(mach);
731 out:
732 return ret;
733 }
734
735 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
736 {
737 int ret = -ENXIO;
738
739 switch (attr->attr) {
740 case KVM_S390_VM_CPU_PROCESSOR:
741 ret = kvm_s390_get_processor(kvm, attr);
742 break;
743 case KVM_S390_VM_CPU_MACHINE:
744 ret = kvm_s390_get_machine(kvm, attr);
745 break;
746 }
747 return ret;
748 }
749
750 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
751 {
752 int ret;
753
754 switch (attr->group) {
755 case KVM_S390_VM_MEM_CTRL:
756 ret = kvm_s390_set_mem_control(kvm, attr);
757 break;
758 case KVM_S390_VM_TOD:
759 ret = kvm_s390_set_tod(kvm, attr);
760 break;
761 case KVM_S390_VM_CPU_MODEL:
762 ret = kvm_s390_set_cpu_model(kvm, attr);
763 break;
764 case KVM_S390_VM_CRYPTO:
765 ret = kvm_s390_vm_set_crypto(kvm, attr);
766 break;
767 default:
768 ret = -ENXIO;
769 break;
770 }
771
772 return ret;
773 }
774
775 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
776 {
777 int ret;
778
779 switch (attr->group) {
780 case KVM_S390_VM_MEM_CTRL:
781 ret = kvm_s390_get_mem_control(kvm, attr);
782 break;
783 case KVM_S390_VM_TOD:
784 ret = kvm_s390_get_tod(kvm, attr);
785 break;
786 case KVM_S390_VM_CPU_MODEL:
787 ret = kvm_s390_get_cpu_model(kvm, attr);
788 break;
789 default:
790 ret = -ENXIO;
791 break;
792 }
793
794 return ret;
795 }
796
797 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
798 {
799 int ret;
800
801 switch (attr->group) {
802 case KVM_S390_VM_MEM_CTRL:
803 switch (attr->attr) {
804 case KVM_S390_VM_MEM_ENABLE_CMMA:
805 case KVM_S390_VM_MEM_CLR_CMMA:
806 case KVM_S390_VM_MEM_LIMIT_SIZE:
807 ret = 0;
808 break;
809 default:
810 ret = -ENXIO;
811 break;
812 }
813 break;
814 case KVM_S390_VM_TOD:
815 switch (attr->attr) {
816 case KVM_S390_VM_TOD_LOW:
817 case KVM_S390_VM_TOD_HIGH:
818 ret = 0;
819 break;
820 default:
821 ret = -ENXIO;
822 break;
823 }
824 break;
825 case KVM_S390_VM_CPU_MODEL:
826 switch (attr->attr) {
827 case KVM_S390_VM_CPU_PROCESSOR:
828 case KVM_S390_VM_CPU_MACHINE:
829 ret = 0;
830 break;
831 default:
832 ret = -ENXIO;
833 break;
834 }
835 break;
836 case KVM_S390_VM_CRYPTO:
837 switch (attr->attr) {
838 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
839 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
840 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
841 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
842 ret = 0;
843 break;
844 default:
845 ret = -ENXIO;
846 break;
847 }
848 break;
849 default:
850 ret = -ENXIO;
851 break;
852 }
853
854 return ret;
855 }
856
857 static long kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
858 {
859 uint8_t *keys;
860 uint64_t hva;
861 unsigned long curkey;
862 int i, r = 0;
863
864 if (args->flags != 0)
865 return -EINVAL;
866
867 /* Is this guest using storage keys? */
868 if (!mm_use_skey(current->mm))
869 return KVM_S390_GET_SKEYS_NONE;
870
871 /* Enforce sane limit on memory allocation */
872 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
873 return -EINVAL;
874
875 keys = kmalloc_array(args->count, sizeof(uint8_t),
876 GFP_KERNEL | __GFP_NOWARN);
877 if (!keys)
878 keys = vmalloc(sizeof(uint8_t) * args->count);
879 if (!keys)
880 return -ENOMEM;
881
882 for (i = 0; i < args->count; i++) {
883 hva = gfn_to_hva(kvm, args->start_gfn + i);
884 if (kvm_is_error_hva(hva)) {
885 r = -EFAULT;
886 goto out;
887 }
888
889 curkey = get_guest_storage_key(current->mm, hva);
890 if (IS_ERR_VALUE(curkey)) {
891 r = curkey;
892 goto out;
893 }
894 keys[i] = curkey;
895 }
896
897 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
898 sizeof(uint8_t) * args->count);
899 if (r)
900 r = -EFAULT;
901 out:
902 kvfree(keys);
903 return r;
904 }
905
906 static long kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
907 {
908 uint8_t *keys;
909 uint64_t hva;
910 int i, r = 0;
911
912 if (args->flags != 0)
913 return -EINVAL;
914
915 /* Enforce sane limit on memory allocation */
916 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
917 return -EINVAL;
918
919 keys = kmalloc_array(args->count, sizeof(uint8_t),
920 GFP_KERNEL | __GFP_NOWARN);
921 if (!keys)
922 keys = vmalloc(sizeof(uint8_t) * args->count);
923 if (!keys)
924 return -ENOMEM;
925
926 r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
927 sizeof(uint8_t) * args->count);
928 if (r) {
929 r = -EFAULT;
930 goto out;
931 }
932
933 /* Enable storage key handling for the guest */
934 r = s390_enable_skey();
935 if (r)
936 goto out;
937
938 for (i = 0; i < args->count; i++) {
939 hva = gfn_to_hva(kvm, args->start_gfn + i);
940 if (kvm_is_error_hva(hva)) {
941 r = -EFAULT;
942 goto out;
943 }
944
945 /* Lowest order bit is reserved */
946 if (keys[i] & 0x01) {
947 r = -EINVAL;
948 goto out;
949 }
950
951 r = set_guest_storage_key(current->mm, hva,
952 (unsigned long)keys[i], 0);
953 if (r)
954 goto out;
955 }
956 out:
957 kvfree(keys);
958 return r;
959 }
960
961 long kvm_arch_vm_ioctl(struct file *filp,
962 unsigned int ioctl, unsigned long arg)
963 {
964 struct kvm *kvm = filp->private_data;
965 void __user *argp = (void __user *)arg;
966 struct kvm_device_attr attr;
967 int r;
968
969 switch (ioctl) {
970 case KVM_S390_INTERRUPT: {
971 struct kvm_s390_interrupt s390int;
972
973 r = -EFAULT;
974 if (copy_from_user(&s390int, argp, sizeof(s390int)))
975 break;
976 r = kvm_s390_inject_vm(kvm, &s390int);
977 break;
978 }
979 case KVM_ENABLE_CAP: {
980 struct kvm_enable_cap cap;
981 r = -EFAULT;
982 if (copy_from_user(&cap, argp, sizeof(cap)))
983 break;
984 r = kvm_vm_ioctl_enable_cap(kvm, &cap);
985 break;
986 }
987 case KVM_CREATE_IRQCHIP: {
988 struct kvm_irq_routing_entry routing;
989
990 r = -EINVAL;
991 if (kvm->arch.use_irqchip) {
992 /* Set up dummy routing. */
993 memset(&routing, 0, sizeof(routing));
994 r = kvm_set_irq_routing(kvm, &routing, 0, 0);
995 }
996 break;
997 }
998 case KVM_SET_DEVICE_ATTR: {
999 r = -EFAULT;
1000 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1001 break;
1002 r = kvm_s390_vm_set_attr(kvm, &attr);
1003 break;
1004 }
1005 case KVM_GET_DEVICE_ATTR: {
1006 r = -EFAULT;
1007 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1008 break;
1009 r = kvm_s390_vm_get_attr(kvm, &attr);
1010 break;
1011 }
1012 case KVM_HAS_DEVICE_ATTR: {
1013 r = -EFAULT;
1014 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
1015 break;
1016 r = kvm_s390_vm_has_attr(kvm, &attr);
1017 break;
1018 }
1019 case KVM_S390_GET_SKEYS: {
1020 struct kvm_s390_skeys args;
1021
1022 r = -EFAULT;
1023 if (copy_from_user(&args, argp,
1024 sizeof(struct kvm_s390_skeys)))
1025 break;
1026 r = kvm_s390_get_skeys(kvm, &args);
1027 break;
1028 }
1029 case KVM_S390_SET_SKEYS: {
1030 struct kvm_s390_skeys args;
1031
1032 r = -EFAULT;
1033 if (copy_from_user(&args, argp,
1034 sizeof(struct kvm_s390_skeys)))
1035 break;
1036 r = kvm_s390_set_skeys(kvm, &args);
1037 break;
1038 }
1039 default:
1040 r = -ENOTTY;
1041 }
1042
1043 return r;
1044 }
1045
1046 static int kvm_s390_query_ap_config(u8 *config)
1047 {
1048 u32 fcn_code = 0x04000000UL;
1049 u32 cc = 0;
1050
1051 memset(config, 0, 128);
1052 asm volatile(
1053 "lgr 0,%1\n"
1054 "lgr 2,%2\n"
1055 ".long 0xb2af0000\n" /* PQAP(QCI) */
1056 "0: ipm %0\n"
1057 "srl %0,28\n"
1058 "1:\n"
1059 EX_TABLE(0b, 1b)
1060 : "+r" (cc)
1061 : "r" (fcn_code), "r" (config)
1062 : "cc", "0", "2", "memory"
1063 );
1064
1065 return cc;
1066 }
1067
1068 static int kvm_s390_apxa_installed(void)
1069 {
1070 u8 config[128];
1071 int cc;
1072
1073 if (test_facility(12)) {
1074 cc = kvm_s390_query_ap_config(config);
1075
1076 if (cc)
1077 pr_err("PQAP(QCI) failed with cc=%d", cc);
1078 else
1079 return config[0] & 0x40;
1080 }
1081
1082 return 0;
1083 }
1084
1085 static void kvm_s390_set_crycb_format(struct kvm *kvm)
1086 {
1087 kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
1088
1089 if (kvm_s390_apxa_installed())
1090 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
1091 else
1092 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
1093 }
1094
1095 static u64 kvm_s390_get_initial_cpuid(void)
1096 {
1097 struct cpuid cpuid;
1098
1099 get_cpu_id(&cpuid);
1100 cpuid.version = 0xff;
1101 return *((u64 *) &cpuid);
1102 }
1103
1104 static void kvm_s390_crypto_init(struct kvm *kvm)
1105 {
1106 if (!test_kvm_facility(kvm, 76))
1107 return;
1108
1109 kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
1110 kvm_s390_set_crycb_format(kvm);
1111
1112 /* Enable AES/DEA protected key functions by default */
1113 kvm->arch.crypto.aes_kw = 1;
1114 kvm->arch.crypto.dea_kw = 1;
1115 get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
1116 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
1117 get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
1118 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1119 }
1120
1121 static void sca_dispose(struct kvm *kvm)
1122 {
1123 if (kvm->arch.use_esca)
1124 free_pages_exact(kvm->arch.sca, sizeof(struct esca_block));
1125 else
1126 free_page((unsigned long)(kvm->arch.sca));
1127 kvm->arch.sca = NULL;
1128 }
1129
1130 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
1131 {
1132 int i, rc;
1133 char debug_name[16];
1134 static unsigned long sca_offset;
1135
1136 rc = -EINVAL;
1137 #ifdef CONFIG_KVM_S390_UCONTROL
1138 if (type & ~KVM_VM_S390_UCONTROL)
1139 goto out_err;
1140 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
1141 goto out_err;
1142 #else
1143 if (type)
1144 goto out_err;
1145 #endif
1146
1147 rc = s390_enable_sie();
1148 if (rc)
1149 goto out_err;
1150
1151 rc = -ENOMEM;
1152
1153 kvm->arch.use_esca = 0; /* start with basic SCA */
1154 rwlock_init(&kvm->arch.sca_lock);
1155 kvm->arch.sca = (struct bsca_block *) get_zeroed_page(GFP_KERNEL);
1156 if (!kvm->arch.sca)
1157 goto out_err;
1158 spin_lock(&kvm_lock);
1159 sca_offset += 16;
1160 if (sca_offset + sizeof(struct bsca_block) > PAGE_SIZE)
1161 sca_offset = 0;
1162 kvm->arch.sca = (struct bsca_block *)
1163 ((char *) kvm->arch.sca + sca_offset);
1164 spin_unlock(&kvm_lock);
1165
1166 sprintf(debug_name, "kvm-%u", current->pid);
1167
1168 kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
1169 if (!kvm->arch.dbf)
1170 goto out_err;
1171
1172 kvm->arch.sie_page2 =
1173 (struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
1174 if (!kvm->arch.sie_page2)
1175 goto out_err;
1176
1177 /* Populate the facility mask initially. */
1178 memcpy(kvm->arch.model.fac_mask, S390_lowcore.stfle_fac_list,
1179 S390_ARCH_FAC_LIST_SIZE_BYTE);
1180 for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
1181 if (i < kvm_s390_fac_list_mask_size())
1182 kvm->arch.model.fac_mask[i] &= kvm_s390_fac_list_mask[i];
1183 else
1184 kvm->arch.model.fac_mask[i] = 0UL;
1185 }
1186
1187 /* Populate the facility list initially. */
1188 kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
1189 memcpy(kvm->arch.model.fac_list, kvm->arch.model.fac_mask,
1190 S390_ARCH_FAC_LIST_SIZE_BYTE);
1191
1192 kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
1193 kvm->arch.model.ibc = sclp.ibc & 0x0fff;
1194
1195 kvm_s390_crypto_init(kvm);
1196
1197 spin_lock_init(&kvm->arch.float_int.lock);
1198 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1199 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
1200 init_waitqueue_head(&kvm->arch.ipte_wq);
1201 mutex_init(&kvm->arch.ipte_mutex);
1202
1203 debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
1204 VM_EVENT(kvm, 3, "vm created with type %lu", type);
1205
1206 if (type & KVM_VM_S390_UCONTROL) {
1207 kvm->arch.gmap = NULL;
1208 kvm->arch.mem_limit = KVM_S390_NO_MEM_LIMIT;
1209 } else {
1210 if (sclp.hamax == U64_MAX)
1211 kvm->arch.mem_limit = TASK_MAX_SIZE;
1212 else
1213 kvm->arch.mem_limit = min_t(unsigned long, TASK_MAX_SIZE,
1214 sclp.hamax + 1);
1215 kvm->arch.gmap = gmap_alloc(current->mm, kvm->arch.mem_limit - 1);
1216 if (!kvm->arch.gmap)
1217 goto out_err;
1218 kvm->arch.gmap->private = kvm;
1219 kvm->arch.gmap->pfault_enabled = 0;
1220 }
1221
1222 kvm->arch.css_support = 0;
1223 kvm->arch.use_irqchip = 0;
1224 kvm->arch.epoch = 0;
1225
1226 spin_lock_init(&kvm->arch.start_stop_lock);
1227 KVM_EVENT(3, "vm 0x%pK created by pid %u", kvm, current->pid);
1228
1229 return 0;
1230 out_err:
1231 free_page((unsigned long)kvm->arch.sie_page2);
1232 debug_unregister(kvm->arch.dbf);
1233 sca_dispose(kvm);
1234 KVM_EVENT(3, "creation of vm failed: %d", rc);
1235 return rc;
1236 }
1237
1238 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
1239 {
1240 VCPU_EVENT(vcpu, 3, "%s", "free cpu");
1241 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
1242 kvm_s390_clear_local_irqs(vcpu);
1243 kvm_clear_async_pf_completion_queue(vcpu);
1244 if (!kvm_is_ucontrol(vcpu->kvm))
1245 sca_del_vcpu(vcpu);
1246
1247 if (kvm_is_ucontrol(vcpu->kvm))
1248 gmap_free(vcpu->arch.gmap);
1249
1250 if (vcpu->kvm->arch.use_cmma)
1251 kvm_s390_vcpu_unsetup_cmma(vcpu);
1252 free_page((unsigned long)(vcpu->arch.sie_block));
1253
1254 kvm_vcpu_uninit(vcpu);
1255 kmem_cache_free(kvm_vcpu_cache, vcpu);
1256 }
1257
1258 static void kvm_free_vcpus(struct kvm *kvm)
1259 {
1260 unsigned int i;
1261 struct kvm_vcpu *vcpu;
1262
1263 kvm_for_each_vcpu(i, vcpu, kvm)
1264 kvm_arch_vcpu_destroy(vcpu);
1265
1266 mutex_lock(&kvm->lock);
1267 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
1268 kvm->vcpus[i] = NULL;
1269
1270 atomic_set(&kvm->online_vcpus, 0);
1271 mutex_unlock(&kvm->lock);
1272 }
1273
1274 void kvm_arch_destroy_vm(struct kvm *kvm)
1275 {
1276 kvm_free_vcpus(kvm);
1277 sca_dispose(kvm);
1278 debug_unregister(kvm->arch.dbf);
1279 free_page((unsigned long)kvm->arch.sie_page2);
1280 if (!kvm_is_ucontrol(kvm))
1281 gmap_free(kvm->arch.gmap);
1282 kvm_s390_destroy_adapters(kvm);
1283 kvm_s390_clear_float_irqs(kvm);
1284 KVM_EVENT(3, "vm 0x%pK destroyed", kvm);
1285 }
1286
1287 /* Section: vcpu related */
1288 static int __kvm_ucontrol_vcpu_init(struct kvm_vcpu *vcpu)
1289 {
1290 vcpu->arch.gmap = gmap_alloc(current->mm, -1UL);
1291 if (!vcpu->arch.gmap)
1292 return -ENOMEM;
1293 vcpu->arch.gmap->private = vcpu->kvm;
1294
1295 return 0;
1296 }
1297
1298 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
1299 {
1300 read_lock(&vcpu->kvm->arch.sca_lock);
1301 if (vcpu->kvm->arch.use_esca) {
1302 struct esca_block *sca = vcpu->kvm->arch.sca;
1303
1304 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
1305 sca->cpu[vcpu->vcpu_id].sda = 0;
1306 } else {
1307 struct bsca_block *sca = vcpu->kvm->arch.sca;
1308
1309 clear_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
1310 sca->cpu[vcpu->vcpu_id].sda = 0;
1311 }
1312 read_unlock(&vcpu->kvm->arch.sca_lock);
1313 }
1314
1315 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
1316 {
1317 read_lock(&vcpu->kvm->arch.sca_lock);
1318 if (vcpu->kvm->arch.use_esca) {
1319 struct esca_block *sca = vcpu->kvm->arch.sca;
1320
1321 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
1322 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
1323 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca & ~0x3fU;
1324 vcpu->arch.sie_block->ecb2 |= 0x04U;
1325 set_bit_inv(vcpu->vcpu_id, (unsigned long *) sca->mcn);
1326 } else {
1327 struct bsca_block *sca = vcpu->kvm->arch.sca;
1328
1329 sca->cpu[vcpu->vcpu_id].sda = (__u64) vcpu->arch.sie_block;
1330 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)sca) >> 32);
1331 vcpu->arch.sie_block->scaol = (__u32)(__u64)sca;
1332 set_bit_inv(vcpu->vcpu_id, (unsigned long *) &sca->mcn);
1333 }
1334 read_unlock(&vcpu->kvm->arch.sca_lock);
1335 }
1336
1337 /* Basic SCA to Extended SCA data copy routines */
1338 static inline void sca_copy_entry(struct esca_entry *d, struct bsca_entry *s)
1339 {
1340 d->sda = s->sda;
1341 d->sigp_ctrl.c = s->sigp_ctrl.c;
1342 d->sigp_ctrl.scn = s->sigp_ctrl.scn;
1343 }
1344
1345 static void sca_copy_b_to_e(struct esca_block *d, struct bsca_block *s)
1346 {
1347 int i;
1348
1349 d->ipte_control = s->ipte_control;
1350 d->mcn[0] = s->mcn;
1351 for (i = 0; i < KVM_S390_BSCA_CPU_SLOTS; i++)
1352 sca_copy_entry(&d->cpu[i], &s->cpu[i]);
1353 }
1354
1355 static int sca_switch_to_extended(struct kvm *kvm)
1356 {
1357 struct bsca_block *old_sca = kvm->arch.sca;
1358 struct esca_block *new_sca;
1359 struct kvm_vcpu *vcpu;
1360 unsigned int vcpu_idx;
1361 u32 scaol, scaoh;
1362
1363 new_sca = alloc_pages_exact(sizeof(*new_sca), GFP_KERNEL|__GFP_ZERO);
1364 if (!new_sca)
1365 return -ENOMEM;
1366
1367 scaoh = (u32)((u64)(new_sca) >> 32);
1368 scaol = (u32)(u64)(new_sca) & ~0x3fU;
1369
1370 kvm_s390_vcpu_block_all(kvm);
1371 write_lock(&kvm->arch.sca_lock);
1372
1373 sca_copy_b_to_e(new_sca, old_sca);
1374
1375 kvm_for_each_vcpu(vcpu_idx, vcpu, kvm) {
1376 vcpu->arch.sie_block->scaoh = scaoh;
1377 vcpu->arch.sie_block->scaol = scaol;
1378 vcpu->arch.sie_block->ecb2 |= 0x04U;
1379 }
1380 kvm->arch.sca = new_sca;
1381 kvm->arch.use_esca = 1;
1382
1383 write_unlock(&kvm->arch.sca_lock);
1384 kvm_s390_vcpu_unblock_all(kvm);
1385
1386 free_page((unsigned long)old_sca);
1387
1388 VM_EVENT(kvm, 2, "Switched to ESCA (0x%pK -> 0x%pK)",
1389 old_sca, kvm->arch.sca);
1390 return 0;
1391 }
1392
1393 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
1394 {
1395 int rc;
1396
1397 if (id < KVM_S390_BSCA_CPU_SLOTS)
1398 return true;
1399 if (!sclp.has_esca)
1400 return false;
1401
1402 mutex_lock(&kvm->lock);
1403 rc = kvm->arch.use_esca ? 0 : sca_switch_to_extended(kvm);
1404 mutex_unlock(&kvm->lock);
1405
1406 return rc == 0 && id < KVM_S390_ESCA_CPU_SLOTS;
1407 }
1408
1409 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
1410 {
1411 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
1412 kvm_clear_async_pf_completion_queue(vcpu);
1413 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
1414 KVM_SYNC_GPRS |
1415 KVM_SYNC_ACRS |
1416 KVM_SYNC_CRS |
1417 KVM_SYNC_ARCH0 |
1418 KVM_SYNC_PFAULT;
1419 if (test_kvm_facility(vcpu->kvm, 64))
1420 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
1421 /* fprs can be synchronized via vrs, even if the guest has no vx. With
1422 * MACHINE_HAS_VX, (load|store)_fpu_regs() will work with vrs format.
1423 */
1424 if (MACHINE_HAS_VX)
1425 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
1426 else
1427 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
1428
1429 if (kvm_is_ucontrol(vcpu->kvm))
1430 return __kvm_ucontrol_vcpu_init(vcpu);
1431
1432 return 0;
1433 }
1434
1435 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
1436 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
1437 {
1438 WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
1439 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
1440 vcpu->arch.cputm_start = get_tod_clock_fast();
1441 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
1442 }
1443
1444 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
1445 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
1446 {
1447 WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
1448 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
1449 vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
1450 vcpu->arch.cputm_start = 0;
1451 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
1452 }
1453
1454 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
1455 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
1456 {
1457 WARN_ON_ONCE(vcpu->arch.cputm_enabled);
1458 vcpu->arch.cputm_enabled = true;
1459 __start_cpu_timer_accounting(vcpu);
1460 }
1461
1462 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
1463 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
1464 {
1465 WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
1466 __stop_cpu_timer_accounting(vcpu);
1467 vcpu->arch.cputm_enabled = false;
1468 }
1469
1470 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
1471 {
1472 preempt_disable(); /* protect from TOD sync and vcpu_load/put */
1473 __enable_cpu_timer_accounting(vcpu);
1474 preempt_enable();
1475 }
1476
1477 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
1478 {
1479 preempt_disable(); /* protect from TOD sync and vcpu_load/put */
1480 __disable_cpu_timer_accounting(vcpu);
1481 preempt_enable();
1482 }
1483
1484 /* set the cpu timer - may only be called from the VCPU thread itself */
1485 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
1486 {
1487 preempt_disable(); /* protect from TOD sync and vcpu_load/put */
1488 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
1489 if (vcpu->arch.cputm_enabled)
1490 vcpu->arch.cputm_start = get_tod_clock_fast();
1491 vcpu->arch.sie_block->cputm = cputm;
1492 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
1493 preempt_enable();
1494 }
1495
1496 /* update and get the cpu timer - can also be called from other VCPU threads */
1497 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
1498 {
1499 unsigned int seq;
1500 __u64 value;
1501
1502 if (unlikely(!vcpu->arch.cputm_enabled))
1503 return vcpu->arch.sie_block->cputm;
1504
1505 preempt_disable(); /* protect from TOD sync and vcpu_load/put */
1506 do {
1507 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
1508 /*
1509 * If the writer would ever execute a read in the critical
1510 * section, e.g. in irq context, we have a deadlock.
1511 */
1512 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
1513 value = vcpu->arch.sie_block->cputm;
1514 /* if cputm_start is 0, accounting is being started/stopped */
1515 if (likely(vcpu->arch.cputm_start))
1516 value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
1517 } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
1518 preempt_enable();
1519 return value;
1520 }
1521
1522 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1523 {
1524 /* Save host register state */
1525 save_fpu_regs();
1526 vcpu->arch.host_fpregs.fpc = current->thread.fpu.fpc;
1527 vcpu->arch.host_fpregs.regs = current->thread.fpu.regs;
1528
1529 if (MACHINE_HAS_VX)
1530 current->thread.fpu.regs = vcpu->run->s.regs.vrs;
1531 else
1532 current->thread.fpu.regs = vcpu->run->s.regs.fprs;
1533 current->thread.fpu.fpc = vcpu->run->s.regs.fpc;
1534 if (test_fp_ctl(current->thread.fpu.fpc))
1535 /* User space provided an invalid FPC, let's clear it */
1536 current->thread.fpu.fpc = 0;
1537
1538 save_access_regs(vcpu->arch.host_acrs);
1539 restore_access_regs(vcpu->run->s.regs.acrs);
1540 gmap_enable(vcpu->arch.gmap);
1541 atomic_or(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
1542 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
1543 __start_cpu_timer_accounting(vcpu);
1544 vcpu->cpu = cpu;
1545 }
1546
1547 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
1548 {
1549 vcpu->cpu = -1;
1550 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
1551 __stop_cpu_timer_accounting(vcpu);
1552 atomic_andnot(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
1553 gmap_disable(vcpu->arch.gmap);
1554
1555 /* Save guest register state */
1556 save_fpu_regs();
1557 vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
1558
1559 /* Restore host register state */
1560 current->thread.fpu.fpc = vcpu->arch.host_fpregs.fpc;
1561 current->thread.fpu.regs = vcpu->arch.host_fpregs.regs;
1562
1563 save_access_regs(vcpu->run->s.regs.acrs);
1564 restore_access_regs(vcpu->arch.host_acrs);
1565 }
1566
1567 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
1568 {
1569 /* this equals initial cpu reset in pop, but we don't switch to ESA */
1570 vcpu->arch.sie_block->gpsw.mask = 0UL;
1571 vcpu->arch.sie_block->gpsw.addr = 0UL;
1572 kvm_s390_set_prefix(vcpu, 0);
1573 kvm_s390_set_cpu_timer(vcpu, 0);
1574 vcpu->arch.sie_block->ckc = 0UL;
1575 vcpu->arch.sie_block->todpr = 0;
1576 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
1577 vcpu->arch.sie_block->gcr[0] = 0xE0UL;
1578 vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
1579 /* make sure the new fpc will be lazily loaded */
1580 save_fpu_regs();
1581 current->thread.fpu.fpc = 0;
1582 vcpu->arch.sie_block->gbea = 1;
1583 vcpu->arch.sie_block->pp = 0;
1584 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
1585 kvm_clear_async_pf_completion_queue(vcpu);
1586 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
1587 kvm_s390_vcpu_stop(vcpu);
1588 kvm_s390_clear_local_irqs(vcpu);
1589 }
1590
1591 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
1592 {
1593 mutex_lock(&vcpu->kvm->lock);
1594 preempt_disable();
1595 vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
1596 preempt_enable();
1597 mutex_unlock(&vcpu->kvm->lock);
1598 if (!kvm_is_ucontrol(vcpu->kvm)) {
1599 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
1600 sca_add_vcpu(vcpu);
1601 }
1602
1603 }
1604
1605 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
1606 {
1607 if (!test_kvm_facility(vcpu->kvm, 76))
1608 return;
1609
1610 vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
1611
1612 if (vcpu->kvm->arch.crypto.aes_kw)
1613 vcpu->arch.sie_block->ecb3 |= ECB3_AES;
1614 if (vcpu->kvm->arch.crypto.dea_kw)
1615 vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
1616
1617 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
1618 }
1619
1620 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
1621 {
1622 free_page(vcpu->arch.sie_block->cbrlo);
1623 vcpu->arch.sie_block->cbrlo = 0;
1624 }
1625
1626 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
1627 {
1628 vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
1629 if (!vcpu->arch.sie_block->cbrlo)
1630 return -ENOMEM;
1631
1632 vcpu->arch.sie_block->ecb2 |= 0x80;
1633 vcpu->arch.sie_block->ecb2 &= ~0x08;
1634 return 0;
1635 }
1636
1637 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
1638 {
1639 struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
1640
1641 vcpu->arch.sie_block->ibc = model->ibc;
1642 if (test_kvm_facility(vcpu->kvm, 7))
1643 vcpu->arch.sie_block->fac = (u32)(u64) model->fac_list;
1644 }
1645
1646 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
1647 {
1648 int rc = 0;
1649
1650 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
1651 CPUSTAT_SM |
1652 CPUSTAT_STOPPED);
1653
1654 if (test_kvm_facility(vcpu->kvm, 78))
1655 atomic_or(CPUSTAT_GED2, &vcpu->arch.sie_block->cpuflags);
1656 else if (test_kvm_facility(vcpu->kvm, 8))
1657 atomic_or(CPUSTAT_GED, &vcpu->arch.sie_block->cpuflags);
1658
1659 kvm_s390_vcpu_setup_model(vcpu);
1660
1661 vcpu->arch.sie_block->ecb = 0x02;
1662 if (test_kvm_facility(vcpu->kvm, 9))
1663 vcpu->arch.sie_block->ecb |= 0x04;
1664 if (test_kvm_facility(vcpu->kvm, 50) && test_kvm_facility(vcpu->kvm, 73))
1665 vcpu->arch.sie_block->ecb |= 0x10;
1666
1667 if (test_kvm_facility(vcpu->kvm, 8))
1668 vcpu->arch.sie_block->ecb2 |= 0x08;
1669 vcpu->arch.sie_block->eca = 0xC1002000U;
1670 if (sclp.has_siif)
1671 vcpu->arch.sie_block->eca |= 1;
1672 if (sclp.has_sigpif)
1673 vcpu->arch.sie_block->eca |= 0x10000000U;
1674 if (test_kvm_facility(vcpu->kvm, 64))
1675 vcpu->arch.sie_block->ecb3 |= 0x01;
1676 if (test_kvm_facility(vcpu->kvm, 129)) {
1677 vcpu->arch.sie_block->eca |= 0x00020000;
1678 vcpu->arch.sie_block->ecd |= 0x20000000;
1679 }
1680 vcpu->arch.sie_block->riccbd = (unsigned long) &vcpu->run->s.regs.riccb;
1681 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
1682
1683 if (vcpu->kvm->arch.use_cmma) {
1684 rc = kvm_s390_vcpu_setup_cmma(vcpu);
1685 if (rc)
1686 return rc;
1687 }
1688 hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1689 vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
1690
1691 kvm_s390_vcpu_crypto_setup(vcpu);
1692
1693 return rc;
1694 }
1695
1696 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
1697 unsigned int id)
1698 {
1699 struct kvm_vcpu *vcpu;
1700 struct sie_page *sie_page;
1701 int rc = -EINVAL;
1702
1703 if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
1704 goto out;
1705
1706 rc = -ENOMEM;
1707
1708 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1709 if (!vcpu)
1710 goto out;
1711
1712 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
1713 if (!sie_page)
1714 goto out_free_cpu;
1715
1716 vcpu->arch.sie_block = &sie_page->sie_block;
1717 vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
1718
1719 vcpu->arch.sie_block->icpua = id;
1720 spin_lock_init(&vcpu->arch.local_int.lock);
1721 vcpu->arch.local_int.float_int = &kvm->arch.float_int;
1722 vcpu->arch.local_int.wq = &vcpu->wq;
1723 vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
1724 seqcount_init(&vcpu->arch.cputm_seqcount);
1725
1726 rc = kvm_vcpu_init(vcpu, kvm, id);
1727 if (rc)
1728 goto out_free_sie_block;
1729 VM_EVENT(kvm, 3, "create cpu %d at 0x%pK, sie block at 0x%pK", id, vcpu,
1730 vcpu->arch.sie_block);
1731 trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
1732
1733 return vcpu;
1734 out_free_sie_block:
1735 free_page((unsigned long)(vcpu->arch.sie_block));
1736 out_free_cpu:
1737 kmem_cache_free(kvm_vcpu_cache, vcpu);
1738 out:
1739 return ERR_PTR(rc);
1740 }
1741
1742 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
1743 {
1744 return kvm_s390_vcpu_has_irq(vcpu, 0);
1745 }
1746
1747 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
1748 {
1749 atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
1750 exit_sie(vcpu);
1751 }
1752
1753 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
1754 {
1755 atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
1756 }
1757
1758 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
1759 {
1760 atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
1761 exit_sie(vcpu);
1762 }
1763
1764 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
1765 {
1766 atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
1767 }
1768
1769 /*
1770 * Kick a guest cpu out of SIE and wait until SIE is not running.
1771 * If the CPU is not running (e.g. waiting as idle) the function will
1772 * return immediately. */
1773 void exit_sie(struct kvm_vcpu *vcpu)
1774 {
1775 atomic_or(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
1776 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
1777 cpu_relax();
1778 }
1779
1780 /* Kick a guest cpu out of SIE to process a request synchronously */
1781 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
1782 {
1783 kvm_make_request(req, vcpu);
1784 kvm_s390_vcpu_request(vcpu);
1785 }
1786
1787 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address)
1788 {
1789 int i;
1790 struct kvm *kvm = gmap->private;
1791 struct kvm_vcpu *vcpu;
1792
1793 kvm_for_each_vcpu(i, vcpu, kvm) {
1794 /* match against both prefix pages */
1795 if (kvm_s390_get_prefix(vcpu) == (address & ~0x1000UL)) {
1796 VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address);
1797 kvm_s390_sync_request(KVM_REQ_MMU_RELOAD, vcpu);
1798 }
1799 }
1800 }
1801
1802 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
1803 {
1804 /* kvm common code refers to this, but never calls it */
1805 BUG();
1806 return 0;
1807 }
1808
1809 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
1810 struct kvm_one_reg *reg)
1811 {
1812 int r = -EINVAL;
1813
1814 switch (reg->id) {
1815 case KVM_REG_S390_TODPR:
1816 r = put_user(vcpu->arch.sie_block->todpr,
1817 (u32 __user *)reg->addr);
1818 break;
1819 case KVM_REG_S390_EPOCHDIFF:
1820 r = put_user(vcpu->arch.sie_block->epoch,
1821 (u64 __user *)reg->addr);
1822 break;
1823 case KVM_REG_S390_CPU_TIMER:
1824 r = put_user(kvm_s390_get_cpu_timer(vcpu),
1825 (u64 __user *)reg->addr);
1826 break;
1827 case KVM_REG_S390_CLOCK_COMP:
1828 r = put_user(vcpu->arch.sie_block->ckc,
1829 (u64 __user *)reg->addr);
1830 break;
1831 case KVM_REG_S390_PFTOKEN:
1832 r = put_user(vcpu->arch.pfault_token,
1833 (u64 __user *)reg->addr);
1834 break;
1835 case KVM_REG_S390_PFCOMPARE:
1836 r = put_user(vcpu->arch.pfault_compare,
1837 (u64 __user *)reg->addr);
1838 break;
1839 case KVM_REG_S390_PFSELECT:
1840 r = put_user(vcpu->arch.pfault_select,
1841 (u64 __user *)reg->addr);
1842 break;
1843 case KVM_REG_S390_PP:
1844 r = put_user(vcpu->arch.sie_block->pp,
1845 (u64 __user *)reg->addr);
1846 break;
1847 case KVM_REG_S390_GBEA:
1848 r = put_user(vcpu->arch.sie_block->gbea,
1849 (u64 __user *)reg->addr);
1850 break;
1851 default:
1852 break;
1853 }
1854
1855 return r;
1856 }
1857
1858 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
1859 struct kvm_one_reg *reg)
1860 {
1861 int r = -EINVAL;
1862 __u64 val;
1863
1864 switch (reg->id) {
1865 case KVM_REG_S390_TODPR:
1866 r = get_user(vcpu->arch.sie_block->todpr,
1867 (u32 __user *)reg->addr);
1868 break;
1869 case KVM_REG_S390_EPOCHDIFF:
1870 r = get_user(vcpu->arch.sie_block->epoch,
1871 (u64 __user *)reg->addr);
1872 break;
1873 case KVM_REG_S390_CPU_TIMER:
1874 r = get_user(val, (u64 __user *)reg->addr);
1875 if (!r)
1876 kvm_s390_set_cpu_timer(vcpu, val);
1877 break;
1878 case KVM_REG_S390_CLOCK_COMP:
1879 r = get_user(vcpu->arch.sie_block->ckc,
1880 (u64 __user *)reg->addr);
1881 break;
1882 case KVM_REG_S390_PFTOKEN:
1883 r = get_user(vcpu->arch.pfault_token,
1884 (u64 __user *)reg->addr);
1885 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
1886 kvm_clear_async_pf_completion_queue(vcpu);
1887 break;
1888 case KVM_REG_S390_PFCOMPARE:
1889 r = get_user(vcpu->arch.pfault_compare,
1890 (u64 __user *)reg->addr);
1891 break;
1892 case KVM_REG_S390_PFSELECT:
1893 r = get_user(vcpu->arch.pfault_select,
1894 (u64 __user *)reg->addr);
1895 break;
1896 case KVM_REG_S390_PP:
1897 r = get_user(vcpu->arch.sie_block->pp,
1898 (u64 __user *)reg->addr);
1899 break;
1900 case KVM_REG_S390_GBEA:
1901 r = get_user(vcpu->arch.sie_block->gbea,
1902 (u64 __user *)reg->addr);
1903 break;
1904 default:
1905 break;
1906 }
1907
1908 return r;
1909 }
1910
1911 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
1912 {
1913 kvm_s390_vcpu_initial_reset(vcpu);
1914 return 0;
1915 }
1916
1917 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
1918 {
1919 memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
1920 return 0;
1921 }
1922
1923 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
1924 {
1925 memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
1926 return 0;
1927 }
1928
1929 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1930 struct kvm_sregs *sregs)
1931 {
1932 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
1933 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
1934 restore_access_regs(vcpu->run->s.regs.acrs);
1935 return 0;
1936 }
1937
1938 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1939 struct kvm_sregs *sregs)
1940 {
1941 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
1942 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
1943 return 0;
1944 }
1945
1946 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
1947 {
1948 /* make sure the new values will be lazily loaded */
1949 save_fpu_regs();
1950 if (test_fp_ctl(fpu->fpc))
1951 return -EINVAL;
1952 current->thread.fpu.fpc = fpu->fpc;
1953 if (MACHINE_HAS_VX)
1954 convert_fp_to_vx(current->thread.fpu.vxrs, (freg_t *)fpu->fprs);
1955 else
1956 memcpy(current->thread.fpu.fprs, &fpu->fprs, sizeof(fpu->fprs));
1957 return 0;
1958 }
1959
1960 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
1961 {
1962 /* make sure we have the latest values */
1963 save_fpu_regs();
1964 if (MACHINE_HAS_VX)
1965 convert_vx_to_fp((freg_t *)fpu->fprs, current->thread.fpu.vxrs);
1966 else
1967 memcpy(fpu->fprs, current->thread.fpu.fprs, sizeof(fpu->fprs));
1968 fpu->fpc = current->thread.fpu.fpc;
1969 return 0;
1970 }
1971
1972 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
1973 {
1974 int rc = 0;
1975
1976 if (!is_vcpu_stopped(vcpu))
1977 rc = -EBUSY;
1978 else {
1979 vcpu->run->psw_mask = psw.mask;
1980 vcpu->run->psw_addr = psw.addr;
1981 }
1982 return rc;
1983 }
1984
1985 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1986 struct kvm_translation *tr)
1987 {
1988 return -EINVAL; /* not implemented yet */
1989 }
1990
1991 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
1992 KVM_GUESTDBG_USE_HW_BP | \
1993 KVM_GUESTDBG_ENABLE)
1994
1995 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
1996 struct kvm_guest_debug *dbg)
1997 {
1998 int rc = 0;
1999
2000 vcpu->guest_debug = 0;
2001 kvm_s390_clear_bp_data(vcpu);
2002
2003 if (dbg->control & ~VALID_GUESTDBG_FLAGS)
2004 return -EINVAL;
2005
2006 if (dbg->control & KVM_GUESTDBG_ENABLE) {
2007 vcpu->guest_debug = dbg->control;
2008 /* enforce guest PER */
2009 atomic_or(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2010
2011 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
2012 rc = kvm_s390_import_bp_data(vcpu, dbg);
2013 } else {
2014 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2015 vcpu->arch.guestdbg.last_bp = 0;
2016 }
2017
2018 if (rc) {
2019 vcpu->guest_debug = 0;
2020 kvm_s390_clear_bp_data(vcpu);
2021 atomic_andnot(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
2022 }
2023
2024 return rc;
2025 }
2026
2027 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
2028 struct kvm_mp_state *mp_state)
2029 {
2030 /* CHECK_STOP and LOAD are not supported yet */
2031 return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
2032 KVM_MP_STATE_OPERATING;
2033 }
2034
2035 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
2036 struct kvm_mp_state *mp_state)
2037 {
2038 int rc = 0;
2039
2040 /* user space knows about this interface - let it control the state */
2041 vcpu->kvm->arch.user_cpu_state_ctrl = 1;
2042
2043 switch (mp_state->mp_state) {
2044 case KVM_MP_STATE_STOPPED:
2045 kvm_s390_vcpu_stop(vcpu);
2046 break;
2047 case KVM_MP_STATE_OPERATING:
2048 kvm_s390_vcpu_start(vcpu);
2049 break;
2050 case KVM_MP_STATE_LOAD:
2051 case KVM_MP_STATE_CHECK_STOP:
2052 /* fall through - CHECK_STOP and LOAD are not supported yet */
2053 default:
2054 rc = -ENXIO;
2055 }
2056
2057 return rc;
2058 }
2059
2060 static bool ibs_enabled(struct kvm_vcpu *vcpu)
2061 {
2062 return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
2063 }
2064
2065 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
2066 {
2067 retry:
2068 kvm_s390_vcpu_request_handled(vcpu);
2069 if (!vcpu->requests)
2070 return 0;
2071 /*
2072 * We use MMU_RELOAD just to re-arm the ipte notifier for the
2073 * guest prefix page. gmap_ipte_notify will wait on the ptl lock.
2074 * This ensures that the ipte instruction for this request has
2075 * already finished. We might race against a second unmapper that
2076 * wants to set the blocking bit. Lets just retry the request loop.
2077 */
2078 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
2079 int rc;
2080 rc = gmap_ipte_notify(vcpu->arch.gmap,
2081 kvm_s390_get_prefix(vcpu),
2082 PAGE_SIZE * 2);
2083 if (rc)
2084 return rc;
2085 goto retry;
2086 }
2087
2088 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
2089 vcpu->arch.sie_block->ihcpu = 0xffff;
2090 goto retry;
2091 }
2092
2093 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
2094 if (!ibs_enabled(vcpu)) {
2095 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
2096 atomic_or(CPUSTAT_IBS,
2097 &vcpu->arch.sie_block->cpuflags);
2098 }
2099 goto retry;
2100 }
2101
2102 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
2103 if (ibs_enabled(vcpu)) {
2104 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
2105 atomic_andnot(CPUSTAT_IBS,
2106 &vcpu->arch.sie_block->cpuflags);
2107 }
2108 goto retry;
2109 }
2110
2111 /* nothing to do, just clear the request */
2112 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
2113
2114 return 0;
2115 }
2116
2117 void kvm_s390_set_tod_clock(struct kvm *kvm, u64 tod)
2118 {
2119 struct kvm_vcpu *vcpu;
2120 int i;
2121
2122 mutex_lock(&kvm->lock);
2123 preempt_disable();
2124 kvm->arch.epoch = tod - get_tod_clock();
2125 kvm_s390_vcpu_block_all(kvm);
2126 kvm_for_each_vcpu(i, vcpu, kvm)
2127 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
2128 kvm_s390_vcpu_unblock_all(kvm);
2129 preempt_enable();
2130 mutex_unlock(&kvm->lock);
2131 }
2132
2133 /**
2134 * kvm_arch_fault_in_page - fault-in guest page if necessary
2135 * @vcpu: The corresponding virtual cpu
2136 * @gpa: Guest physical address
2137 * @writable: Whether the page should be writable or not
2138 *
2139 * Make sure that a guest page has been faulted-in on the host.
2140 *
2141 * Return: Zero on success, negative error code otherwise.
2142 */
2143 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
2144 {
2145 return gmap_fault(vcpu->arch.gmap, gpa,
2146 writable ? FAULT_FLAG_WRITE : 0);
2147 }
2148
2149 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
2150 unsigned long token)
2151 {
2152 struct kvm_s390_interrupt inti;
2153 struct kvm_s390_irq irq;
2154
2155 if (start_token) {
2156 irq.u.ext.ext_params2 = token;
2157 irq.type = KVM_S390_INT_PFAULT_INIT;
2158 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
2159 } else {
2160 inti.type = KVM_S390_INT_PFAULT_DONE;
2161 inti.parm64 = token;
2162 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
2163 }
2164 }
2165
2166 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
2167 struct kvm_async_pf *work)
2168 {
2169 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
2170 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
2171 }
2172
2173 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
2174 struct kvm_async_pf *work)
2175 {
2176 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
2177 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
2178 }
2179
2180 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
2181 struct kvm_async_pf *work)
2182 {
2183 /* s390 will always inject the page directly */
2184 }
2185
2186 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
2187 {
2188 /*
2189 * s390 will always inject the page directly,
2190 * but we still want check_async_completion to cleanup
2191 */
2192 return true;
2193 }
2194
2195 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
2196 {
2197 hva_t hva;
2198 struct kvm_arch_async_pf arch;
2199 int rc;
2200
2201 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
2202 return 0;
2203 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
2204 vcpu->arch.pfault_compare)
2205 return 0;
2206 if (psw_extint_disabled(vcpu))
2207 return 0;
2208 if (kvm_s390_vcpu_has_irq(vcpu, 0))
2209 return 0;
2210 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
2211 return 0;
2212 if (!vcpu->arch.gmap->pfault_enabled)
2213 return 0;
2214
2215 hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
2216 hva += current->thread.gmap_addr & ~PAGE_MASK;
2217 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
2218 return 0;
2219
2220 rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
2221 return rc;
2222 }
2223
2224 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
2225 {
2226 int rc, cpuflags;
2227
2228 /*
2229 * On s390 notifications for arriving pages will be delivered directly
2230 * to the guest but the house keeping for completed pfaults is
2231 * handled outside the worker.
2232 */
2233 kvm_check_async_pf_completion(vcpu);
2234
2235 vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
2236 vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
2237
2238 if (need_resched())
2239 schedule();
2240
2241 if (test_cpu_flag(CIF_MCCK_PENDING))
2242 s390_handle_mcck();
2243
2244 if (!kvm_is_ucontrol(vcpu->kvm)) {
2245 rc = kvm_s390_deliver_pending_interrupts(vcpu);
2246 if (rc)
2247 return rc;
2248 }
2249
2250 rc = kvm_s390_handle_requests(vcpu);
2251 if (rc)
2252 return rc;
2253
2254 if (guestdbg_enabled(vcpu)) {
2255 kvm_s390_backup_guest_per_regs(vcpu);
2256 kvm_s390_patch_guest_per_regs(vcpu);
2257 }
2258
2259 vcpu->arch.sie_block->icptcode = 0;
2260 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
2261 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
2262 trace_kvm_s390_sie_enter(vcpu, cpuflags);
2263
2264 return 0;
2265 }
2266
2267 static int vcpu_post_run_fault_in_sie(struct kvm_vcpu *vcpu)
2268 {
2269 struct kvm_s390_pgm_info pgm_info = {
2270 .code = PGM_ADDRESSING,
2271 };
2272 u8 opcode, ilen;
2273 int rc;
2274
2275 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
2276 trace_kvm_s390_sie_fault(vcpu);
2277
2278 /*
2279 * We want to inject an addressing exception, which is defined as a
2280 * suppressing or terminating exception. However, since we came here
2281 * by a DAT access exception, the PSW still points to the faulting
2282 * instruction since DAT exceptions are nullifying. So we've got
2283 * to look up the current opcode to get the length of the instruction
2284 * to be able to forward the PSW.
2285 */
2286 rc = read_guest_instr(vcpu, &opcode, 1);
2287 ilen = insn_length(opcode);
2288 if (rc < 0) {
2289 return rc;
2290 } else if (rc) {
2291 /* Instruction-Fetching Exceptions - we can't detect the ilen.
2292 * Forward by arbitrary ilc, injection will take care of
2293 * nullification if necessary.
2294 */
2295 pgm_info = vcpu->arch.pgm;
2296 ilen = 4;
2297 }
2298 pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
2299 kvm_s390_forward_psw(vcpu, ilen);
2300 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
2301 }
2302
2303 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
2304 {
2305 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
2306 vcpu->arch.sie_block->icptcode);
2307 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
2308
2309 if (guestdbg_enabled(vcpu))
2310 kvm_s390_restore_guest_per_regs(vcpu);
2311
2312 vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
2313 vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
2314
2315 if (vcpu->arch.sie_block->icptcode > 0) {
2316 int rc = kvm_handle_sie_intercept(vcpu);
2317
2318 if (rc != -EOPNOTSUPP)
2319 return rc;
2320 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
2321 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
2322 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
2323 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
2324 return -EREMOTE;
2325 } else if (exit_reason != -EFAULT) {
2326 vcpu->stat.exit_null++;
2327 return 0;
2328 } else if (kvm_is_ucontrol(vcpu->kvm)) {
2329 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
2330 vcpu->run->s390_ucontrol.trans_exc_code =
2331 current->thread.gmap_addr;
2332 vcpu->run->s390_ucontrol.pgm_code = 0x10;
2333 return -EREMOTE;
2334 } else if (current->thread.gmap_pfault) {
2335 trace_kvm_s390_major_guest_pfault(vcpu);
2336 current->thread.gmap_pfault = 0;
2337 if (kvm_arch_setup_async_pf(vcpu))
2338 return 0;
2339 return kvm_arch_fault_in_page(vcpu, current->thread.gmap_addr, 1);
2340 }
2341 return vcpu_post_run_fault_in_sie(vcpu);
2342 }
2343
2344 static int __vcpu_run(struct kvm_vcpu *vcpu)
2345 {
2346 int rc, exit_reason;
2347
2348 /*
2349 * We try to hold kvm->srcu during most of vcpu_run (except when run-
2350 * ning the guest), so that memslots (and other stuff) are protected
2351 */
2352 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
2353
2354 do {
2355 rc = vcpu_pre_run(vcpu);
2356 if (rc)
2357 break;
2358
2359 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
2360 /*
2361 * As PF_VCPU will be used in fault handler, between
2362 * guest_enter and guest_exit should be no uaccess.
2363 */
2364 local_irq_disable();
2365 __kvm_guest_enter();
2366 __disable_cpu_timer_accounting(vcpu);
2367 local_irq_enable();
2368 exit_reason = sie64a(vcpu->arch.sie_block,
2369 vcpu->run->s.regs.gprs);
2370 local_irq_disable();
2371 __enable_cpu_timer_accounting(vcpu);
2372 __kvm_guest_exit();
2373 local_irq_enable();
2374 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
2375
2376 rc = vcpu_post_run(vcpu, exit_reason);
2377 } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
2378
2379 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
2380 return rc;
2381 }
2382
2383 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2384 {
2385 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
2386 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
2387 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
2388 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
2389 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
2390 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
2391 /* some control register changes require a tlb flush */
2392 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
2393 }
2394 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
2395 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
2396 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
2397 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
2398 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
2399 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
2400 }
2401 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
2402 vcpu->arch.pfault_token = kvm_run->s.regs.pft;
2403 vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
2404 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
2405 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
2406 kvm_clear_async_pf_completion_queue(vcpu);
2407 }
2408 kvm_run->kvm_dirty_regs = 0;
2409 }
2410
2411 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2412 {
2413 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
2414 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
2415 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
2416 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
2417 kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
2418 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
2419 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
2420 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
2421 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
2422 kvm_run->s.regs.pft = vcpu->arch.pfault_token;
2423 kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
2424 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
2425 }
2426
2427 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2428 {
2429 int rc;
2430 sigset_t sigsaved;
2431
2432 if (guestdbg_exit_pending(vcpu)) {
2433 kvm_s390_prepare_debug_exit(vcpu);
2434 return 0;
2435 }
2436
2437 if (vcpu->sigset_active)
2438 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2439
2440 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
2441 kvm_s390_vcpu_start(vcpu);
2442 } else if (is_vcpu_stopped(vcpu)) {
2443 pr_err_ratelimited("can't run stopped vcpu %d\n",
2444 vcpu->vcpu_id);
2445 return -EINVAL;
2446 }
2447
2448 sync_regs(vcpu, kvm_run);
2449 enable_cpu_timer_accounting(vcpu);
2450
2451 might_fault();
2452 rc = __vcpu_run(vcpu);
2453
2454 if (signal_pending(current) && !rc) {
2455 kvm_run->exit_reason = KVM_EXIT_INTR;
2456 rc = -EINTR;
2457 }
2458
2459 if (guestdbg_exit_pending(vcpu) && !rc) {
2460 kvm_s390_prepare_debug_exit(vcpu);
2461 rc = 0;
2462 }
2463
2464 if (rc == -EREMOTE) {
2465 /* userspace support is needed, kvm_run has been prepared */
2466 rc = 0;
2467 }
2468
2469 disable_cpu_timer_accounting(vcpu);
2470 store_regs(vcpu, kvm_run);
2471
2472 if (vcpu->sigset_active)
2473 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2474
2475 vcpu->stat.exit_userspace++;
2476 return rc;
2477 }
2478
2479 /*
2480 * store status at address
2481 * we use have two special cases:
2482 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
2483 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
2484 */
2485 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
2486 {
2487 unsigned char archmode = 1;
2488 freg_t fprs[NUM_FPRS];
2489 unsigned int px;
2490 u64 clkcomp, cputm;
2491 int rc;
2492
2493 px = kvm_s390_get_prefix(vcpu);
2494 if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
2495 if (write_guest_abs(vcpu, 163, &archmode, 1))
2496 return -EFAULT;
2497 gpa = 0;
2498 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
2499 if (write_guest_real(vcpu, 163, &archmode, 1))
2500 return -EFAULT;
2501 gpa = px;
2502 } else
2503 gpa -= __LC_FPREGS_SAVE_AREA;
2504
2505 /* manually convert vector registers if necessary */
2506 if (MACHINE_HAS_VX) {
2507 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
2508 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
2509 fprs, 128);
2510 } else {
2511 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
2512 vcpu->run->s.regs.fprs, 128);
2513 }
2514 rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
2515 vcpu->run->s.regs.gprs, 128);
2516 rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
2517 &vcpu->arch.sie_block->gpsw, 16);
2518 rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
2519 &px, 4);
2520 rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
2521 &vcpu->run->s.regs.fpc, 4);
2522 rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
2523 &vcpu->arch.sie_block->todpr, 4);
2524 cputm = kvm_s390_get_cpu_timer(vcpu);
2525 rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
2526 &cputm, 8);
2527 clkcomp = vcpu->arch.sie_block->ckc >> 8;
2528 rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
2529 &clkcomp, 8);
2530 rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
2531 &vcpu->run->s.regs.acrs, 64);
2532 rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
2533 &vcpu->arch.sie_block->gcr, 128);
2534 return rc ? -EFAULT : 0;
2535 }
2536
2537 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
2538 {
2539 /*
2540 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
2541 * copying in vcpu load/put. Lets update our copies before we save
2542 * it into the save area
2543 */
2544 save_fpu_regs();
2545 vcpu->run->s.regs.fpc = current->thread.fpu.fpc;
2546 save_access_regs(vcpu->run->s.regs.acrs);
2547
2548 return kvm_s390_store_status_unloaded(vcpu, addr);
2549 }
2550
2551 /*
2552 * store additional status at address
2553 */
2554 int kvm_s390_store_adtl_status_unloaded(struct kvm_vcpu *vcpu,
2555 unsigned long gpa)
2556 {
2557 /* Only bits 0-53 are used for address formation */
2558 if (!(gpa & ~0x3ff))
2559 return 0;
2560
2561 return write_guest_abs(vcpu, gpa & ~0x3ff,
2562 (void *)&vcpu->run->s.regs.vrs, 512);
2563 }
2564
2565 int kvm_s390_vcpu_store_adtl_status(struct kvm_vcpu *vcpu, unsigned long addr)
2566 {
2567 if (!test_kvm_facility(vcpu->kvm, 129))
2568 return 0;
2569
2570 /*
2571 * The guest VXRS are in the host VXRs due to the lazy
2572 * copying in vcpu load/put. We can simply call save_fpu_regs()
2573 * to save the current register state because we are in the
2574 * middle of a load/put cycle.
2575 *
2576 * Let's update our copies before we save it into the save area.
2577 */
2578 save_fpu_regs();
2579
2580 return kvm_s390_store_adtl_status_unloaded(vcpu, addr);
2581 }
2582
2583 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
2584 {
2585 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
2586 kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
2587 }
2588
2589 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
2590 {
2591 unsigned int i;
2592 struct kvm_vcpu *vcpu;
2593
2594 kvm_for_each_vcpu(i, vcpu, kvm) {
2595 __disable_ibs_on_vcpu(vcpu);
2596 }
2597 }
2598
2599 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
2600 {
2601 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
2602 kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
2603 }
2604
2605 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
2606 {
2607 int i, online_vcpus, started_vcpus = 0;
2608
2609 if (!is_vcpu_stopped(vcpu))
2610 return;
2611
2612 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
2613 /* Only one cpu at a time may enter/leave the STOPPED state. */
2614 spin_lock(&vcpu->kvm->arch.start_stop_lock);
2615 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
2616
2617 for (i = 0; i < online_vcpus; i++) {
2618 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
2619 started_vcpus++;
2620 }
2621
2622 if (started_vcpus == 0) {
2623 /* we're the only active VCPU -> speed it up */
2624 __enable_ibs_on_vcpu(vcpu);
2625 } else if (started_vcpus == 1) {
2626 /*
2627 * As we are starting a second VCPU, we have to disable
2628 * the IBS facility on all VCPUs to remove potentially
2629 * oustanding ENABLE requests.
2630 */
2631 __disable_ibs_on_all_vcpus(vcpu->kvm);
2632 }
2633
2634 atomic_andnot(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
2635 /*
2636 * Another VCPU might have used IBS while we were offline.
2637 * Let's play safe and flush the VCPU at startup.
2638 */
2639 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
2640 spin_unlock(&vcpu->kvm->arch.start_stop_lock);
2641 return;
2642 }
2643
2644 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
2645 {
2646 int i, online_vcpus, started_vcpus = 0;
2647 struct kvm_vcpu *started_vcpu = NULL;
2648
2649 if (is_vcpu_stopped(vcpu))
2650 return;
2651
2652 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
2653 /* Only one cpu at a time may enter/leave the STOPPED state. */
2654 spin_lock(&vcpu->kvm->arch.start_stop_lock);
2655 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
2656
2657 /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
2658 kvm_s390_clear_stop_irq(vcpu);
2659
2660 atomic_or(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
2661 __disable_ibs_on_vcpu(vcpu);
2662
2663 for (i = 0; i < online_vcpus; i++) {
2664 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
2665 started_vcpus++;
2666 started_vcpu = vcpu->kvm->vcpus[i];
2667 }
2668 }
2669
2670 if (started_vcpus == 1) {
2671 /*
2672 * As we only have one VCPU left, we want to enable the
2673 * IBS facility for that VCPU to speed it up.
2674 */
2675 __enable_ibs_on_vcpu(started_vcpu);
2676 }
2677
2678 spin_unlock(&vcpu->kvm->arch.start_stop_lock);
2679 return;
2680 }
2681
2682 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
2683 struct kvm_enable_cap *cap)
2684 {
2685 int r;
2686
2687 if (cap->flags)
2688 return -EINVAL;
2689
2690 switch (cap->cap) {
2691 case KVM_CAP_S390_CSS_SUPPORT:
2692 if (!vcpu->kvm->arch.css_support) {
2693 vcpu->kvm->arch.css_support = 1;
2694 VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
2695 trace_kvm_s390_enable_css(vcpu->kvm);
2696 }
2697 r = 0;
2698 break;
2699 default:
2700 r = -EINVAL;
2701 break;
2702 }
2703 return r;
2704 }
2705
2706 static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
2707 struct kvm_s390_mem_op *mop)
2708 {
2709 void __user *uaddr = (void __user *)mop->buf;
2710 void *tmpbuf = NULL;
2711 int r, srcu_idx;
2712 const u64 supported_flags = KVM_S390_MEMOP_F_INJECT_EXCEPTION
2713 | KVM_S390_MEMOP_F_CHECK_ONLY;
2714
2715 if (mop->flags & ~supported_flags)
2716 return -EINVAL;
2717
2718 if (mop->size > MEM_OP_MAX_SIZE)
2719 return -E2BIG;
2720
2721 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
2722 tmpbuf = vmalloc(mop->size);
2723 if (!tmpbuf)
2724 return -ENOMEM;
2725 }
2726
2727 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
2728
2729 switch (mop->op) {
2730 case KVM_S390_MEMOP_LOGICAL_READ:
2731 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
2732 r = check_gva_range(vcpu, mop->gaddr, mop->ar,
2733 mop->size, GACC_FETCH);
2734 break;
2735 }
2736 r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
2737 if (r == 0) {
2738 if (copy_to_user(uaddr, tmpbuf, mop->size))
2739 r = -EFAULT;
2740 }
2741 break;
2742 case KVM_S390_MEMOP_LOGICAL_WRITE:
2743 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
2744 r = check_gva_range(vcpu, mop->gaddr, mop->ar,
2745 mop->size, GACC_STORE);
2746 break;
2747 }
2748 if (copy_from_user(tmpbuf, uaddr, mop->size)) {
2749 r = -EFAULT;
2750 break;
2751 }
2752 r = write_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
2753 break;
2754 default:
2755 r = -EINVAL;
2756 }
2757
2758 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
2759
2760 if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
2761 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
2762
2763 vfree(tmpbuf);
2764 return r;
2765 }
2766
2767 long kvm_arch_vcpu_ioctl(struct file *filp,
2768 unsigned int ioctl, unsigned long arg)
2769 {
2770 struct kvm_vcpu *vcpu = filp->private_data;
2771 void __user *argp = (void __user *)arg;
2772 int idx;
2773 long r;
2774
2775 switch (ioctl) {
2776 case KVM_S390_IRQ: {
2777 struct kvm_s390_irq s390irq;
2778
2779 r = -EFAULT;
2780 if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
2781 break;
2782 r = kvm_s390_inject_vcpu(vcpu, &s390irq);
2783 break;
2784 }
2785 case KVM_S390_INTERRUPT: {
2786 struct kvm_s390_interrupt s390int;
2787 struct kvm_s390_irq s390irq;
2788
2789 r = -EFAULT;
2790 if (copy_from_user(&s390int, argp, sizeof(s390int)))
2791 break;
2792 if (s390int_to_s390irq(&s390int, &s390irq))
2793 return -EINVAL;
2794 r = kvm_s390_inject_vcpu(vcpu, &s390irq);
2795 break;
2796 }
2797 case KVM_S390_STORE_STATUS:
2798 idx = srcu_read_lock(&vcpu->kvm->srcu);
2799 r = kvm_s390_vcpu_store_status(vcpu, arg);
2800 srcu_read_unlock(&vcpu->kvm->srcu, idx);
2801 break;
2802 case KVM_S390_SET_INITIAL_PSW: {
2803 psw_t psw;
2804
2805 r = -EFAULT;
2806 if (copy_from_user(&psw, argp, sizeof(psw)))
2807 break;
2808 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
2809 break;
2810 }
2811 case KVM_S390_INITIAL_RESET:
2812 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
2813 break;
2814 case KVM_SET_ONE_REG:
2815 case KVM_GET_ONE_REG: {
2816 struct kvm_one_reg reg;
2817 r = -EFAULT;
2818 if (copy_from_user(&reg, argp, sizeof(reg)))
2819 break;
2820 if (ioctl == KVM_SET_ONE_REG)
2821 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
2822 else
2823 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
2824 break;
2825 }
2826 #ifdef CONFIG_KVM_S390_UCONTROL
2827 case KVM_S390_UCAS_MAP: {
2828 struct kvm_s390_ucas_mapping ucasmap;
2829
2830 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
2831 r = -EFAULT;
2832 break;
2833 }
2834
2835 if (!kvm_is_ucontrol(vcpu->kvm)) {
2836 r = -EINVAL;
2837 break;
2838 }
2839
2840 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
2841 ucasmap.vcpu_addr, ucasmap.length);
2842 break;
2843 }
2844 case KVM_S390_UCAS_UNMAP: {
2845 struct kvm_s390_ucas_mapping ucasmap;
2846
2847 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
2848 r = -EFAULT;
2849 break;
2850 }
2851
2852 if (!kvm_is_ucontrol(vcpu->kvm)) {
2853 r = -EINVAL;
2854 break;
2855 }
2856
2857 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
2858 ucasmap.length);
2859 break;
2860 }
2861 #endif
2862 case KVM_S390_VCPU_FAULT: {
2863 r = gmap_fault(vcpu->arch.gmap, arg, 0);
2864 break;
2865 }
2866 case KVM_ENABLE_CAP:
2867 {
2868 struct kvm_enable_cap cap;
2869 r = -EFAULT;
2870 if (copy_from_user(&cap, argp, sizeof(cap)))
2871 break;
2872 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
2873 break;
2874 }
2875 case KVM_S390_MEM_OP: {
2876 struct kvm_s390_mem_op mem_op;
2877
2878 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
2879 r = kvm_s390_guest_mem_op(vcpu, &mem_op);
2880 else
2881 r = -EFAULT;
2882 break;
2883 }
2884 case KVM_S390_SET_IRQ_STATE: {
2885 struct kvm_s390_irq_state irq_state;
2886
2887 r = -EFAULT;
2888 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
2889 break;
2890 if (irq_state.len > VCPU_IRQS_MAX_BUF ||
2891 irq_state.len == 0 ||
2892 irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
2893 r = -EINVAL;
2894 break;
2895 }
2896 r = kvm_s390_set_irq_state(vcpu,
2897 (void __user *) irq_state.buf,
2898 irq_state.len);
2899 break;
2900 }
2901 case KVM_S390_GET_IRQ_STATE: {
2902 struct kvm_s390_irq_state irq_state;
2903
2904 r = -EFAULT;
2905 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
2906 break;
2907 if (irq_state.len == 0) {
2908 r = -EINVAL;
2909 break;
2910 }
2911 r = kvm_s390_get_irq_state(vcpu,
2912 (__u8 __user *) irq_state.buf,
2913 irq_state.len);
2914 break;
2915 }
2916 default:
2917 r = -ENOTTY;
2918 }
2919 return r;
2920 }
2921
2922 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
2923 {
2924 #ifdef CONFIG_KVM_S390_UCONTROL
2925 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
2926 && (kvm_is_ucontrol(vcpu->kvm))) {
2927 vmf->page = virt_to_page(vcpu->arch.sie_block);
2928 get_page(vmf->page);
2929 return 0;
2930 }
2931 #endif
2932 return VM_FAULT_SIGBUS;
2933 }
2934
2935 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
2936 unsigned long npages)
2937 {
2938 return 0;
2939 }
2940
2941 /* Section: memory related */
2942 int kvm_arch_prepare_memory_region(struct kvm *kvm,
2943 struct kvm_memory_slot *memslot,
2944 const struct kvm_userspace_memory_region *mem,
2945 enum kvm_mr_change change)
2946 {
2947 /* A few sanity checks. We can have memory slots which have to be
2948 located/ended at a segment boundary (1MB). The memory in userland is
2949 ok to be fragmented into various different vmas. It is okay to mmap()
2950 and munmap() stuff in this slot after doing this call at any time */
2951
2952 if (mem->userspace_addr & 0xffffful)
2953 return -EINVAL;
2954
2955 if (mem->memory_size & 0xffffful)
2956 return -EINVAL;
2957
2958 if (mem->guest_phys_addr + mem->memory_size > kvm->arch.mem_limit)
2959 return -EINVAL;
2960
2961 return 0;
2962 }
2963
2964 void kvm_arch_commit_memory_region(struct kvm *kvm,
2965 const struct kvm_userspace_memory_region *mem,
2966 const struct kvm_memory_slot *old,
2967 const struct kvm_memory_slot *new,
2968 enum kvm_mr_change change)
2969 {
2970 int rc;
2971
2972 /* If the basics of the memslot do not change, we do not want
2973 * to update the gmap. Every update causes several unnecessary
2974 * segment translation exceptions. This is usually handled just
2975 * fine by the normal fault handler + gmap, but it will also
2976 * cause faults on the prefix page of running guest CPUs.
2977 */
2978 if (old->userspace_addr == mem->userspace_addr &&
2979 old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
2980 old->npages * PAGE_SIZE == mem->memory_size)
2981 return;
2982
2983 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
2984 mem->guest_phys_addr, mem->memory_size);
2985 if (rc)
2986 pr_warn("failed to commit memory region\n");
2987 return;
2988 }
2989
2990 static inline unsigned long nonhyp_mask(int i)
2991 {
2992 unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
2993
2994 return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
2995 }
2996
2997 void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu)
2998 {
2999 vcpu->valid_wakeup = false;
3000 }
3001
3002 static int __init kvm_s390_init(void)
3003 {
3004 int i;
3005
3006 if (!sclp.has_sief2) {
3007 pr_info("SIE not available\n");
3008 return -ENODEV;
3009 }
3010
3011 for (i = 0; i < 16; i++)
3012 kvm_s390_fac_list_mask[i] |=
3013 S390_lowcore.stfle_fac_list[i] & nonhyp_mask(i);
3014
3015 return kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
3016 }
3017
3018 static void __exit kvm_s390_exit(void)
3019 {
3020 kvm_exit();
3021 }
3022
3023 module_init(kvm_s390_init);
3024 module_exit(kvm_s390_exit);
3025
3026 /*
3027 * Enable autoloading of the kvm module.
3028 * Note that we add the module alias here instead of virt/kvm/kvm_main.c
3029 * since x86 takes a different approach.
3030 */
3031 #include <linux/miscdevice.h>
3032 MODULE_ALIAS_MISCDEV(KVM_MINOR);
3033 MODULE_ALIAS("devname:kvm");
Linux kernel - Deliverables
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