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KVM: remove unneeded return value of vcpu_postcreate
[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/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 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
54 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
55 { "instruction_lctl", VCPU_STAT(instruction_lctl) },
56 { "instruction_stctl", VCPU_STAT(instruction_stctl) },
57 { "instruction_stctg", VCPU_STAT(instruction_stctg) },
58 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
59 { "deliver_external_call", VCPU_STAT(deliver_external_call) },
60 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
61 { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
62 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
63 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
64 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
65 { "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
66 { "exit_wait_state", VCPU_STAT(exit_wait_state) },
67 { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
68 { "instruction_stidp", VCPU_STAT(instruction_stidp) },
69 { "instruction_spx", VCPU_STAT(instruction_spx) },
70 { "instruction_stpx", VCPU_STAT(instruction_stpx) },
71 { "instruction_stap", VCPU_STAT(instruction_stap) },
72 { "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
73 { "instruction_ipte_interlock", VCPU_STAT(instruction_ipte_interlock) },
74 { "instruction_stsch", VCPU_STAT(instruction_stsch) },
75 { "instruction_chsc", VCPU_STAT(instruction_chsc) },
76 { "instruction_essa", VCPU_STAT(instruction_essa) },
77 { "instruction_stsi", VCPU_STAT(instruction_stsi) },
78 { "instruction_stfl", VCPU_STAT(instruction_stfl) },
79 { "instruction_tprot", VCPU_STAT(instruction_tprot) },
80 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
81 { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
82 { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
83 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
84 { "instruction_sigp_cond_emergency", VCPU_STAT(instruction_sigp_cond_emergency) },
85 { "instruction_sigp_start", VCPU_STAT(instruction_sigp_start) },
86 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
87 { "instruction_sigp_stop_store_status", VCPU_STAT(instruction_sigp_stop_store_status) },
88 { "instruction_sigp_store_status", VCPU_STAT(instruction_sigp_store_status) },
89 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
90 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
91 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
92 { "instruction_sigp_cpu_reset", VCPU_STAT(instruction_sigp_cpu_reset) },
93 { "instruction_sigp_init_cpu_reset", VCPU_STAT(instruction_sigp_init_cpu_reset) },
94 { "instruction_sigp_unknown", VCPU_STAT(instruction_sigp_unknown) },
95 { "diagnose_10", VCPU_STAT(diagnose_10) },
96 { "diagnose_44", VCPU_STAT(diagnose_44) },
97 { "diagnose_9c", VCPU_STAT(diagnose_9c) },
98 { NULL }
99 };
100
101 unsigned long *vfacilities;
102 static struct gmap_notifier gmap_notifier;
103
104 /* test availability of vfacility */
105 int test_vfacility(unsigned long nr)
106 {
107 return __test_facility(nr, (void *) vfacilities);
108 }
109
110 /* Section: not file related */
111 int kvm_arch_hardware_enable(void)
112 {
113 /* every s390 is virtualization enabled ;-) */
114 return 0;
115 }
116
117 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address);
118
119 int kvm_arch_hardware_setup(void)
120 {
121 gmap_notifier.notifier_call = kvm_gmap_notifier;
122 gmap_register_ipte_notifier(&gmap_notifier);
123 return 0;
124 }
125
126 void kvm_arch_hardware_unsetup(void)
127 {
128 gmap_unregister_ipte_notifier(&gmap_notifier);
129 }
130
131 int kvm_arch_init(void *opaque)
132 {
133 /* Register floating interrupt controller interface. */
134 return kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
135 }
136
137 /* Section: device related */
138 long kvm_arch_dev_ioctl(struct file *filp,
139 unsigned int ioctl, unsigned long arg)
140 {
141 if (ioctl == KVM_S390_ENABLE_SIE)
142 return s390_enable_sie();
143 return -EINVAL;
144 }
145
146 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
147 {
148 int r;
149
150 switch (ext) {
151 case KVM_CAP_S390_PSW:
152 case KVM_CAP_S390_GMAP:
153 case KVM_CAP_SYNC_MMU:
154 #ifdef CONFIG_KVM_S390_UCONTROL
155 case KVM_CAP_S390_UCONTROL:
156 #endif
157 case KVM_CAP_ASYNC_PF:
158 case KVM_CAP_SYNC_REGS:
159 case KVM_CAP_ONE_REG:
160 case KVM_CAP_ENABLE_CAP:
161 case KVM_CAP_S390_CSS_SUPPORT:
162 case KVM_CAP_IRQFD:
163 case KVM_CAP_IOEVENTFD:
164 case KVM_CAP_DEVICE_CTRL:
165 case KVM_CAP_ENABLE_CAP_VM:
166 case KVM_CAP_S390_IRQCHIP:
167 case KVM_CAP_VM_ATTRIBUTES:
168 case KVM_CAP_MP_STATE:
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 s390_reset_cmma(kvm->arch.gmap->mm);
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 static int kvm_s390_crypto_init(struct kvm *kvm)
405 {
406 if (!test_vfacility(76))
407 return 0;
408
409 kvm->arch.crypto.crycb = kzalloc(sizeof(*kvm->arch.crypto.crycb),
410 GFP_KERNEL | GFP_DMA);
411 if (!kvm->arch.crypto.crycb)
412 return -ENOMEM;
413
414 kvm->arch.crypto.crycbd = (__u32) (unsigned long) kvm->arch.crypto.crycb |
415 CRYCB_FORMAT1;
416
417 return 0;
418 }
419
420 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
421 {
422 int rc;
423 char debug_name[16];
424 static unsigned long sca_offset;
425
426 rc = -EINVAL;
427 #ifdef CONFIG_KVM_S390_UCONTROL
428 if (type & ~KVM_VM_S390_UCONTROL)
429 goto out_err;
430 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
431 goto out_err;
432 #else
433 if (type)
434 goto out_err;
435 #endif
436
437 rc = s390_enable_sie();
438 if (rc)
439 goto out_err;
440
441 rc = -ENOMEM;
442
443 kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
444 if (!kvm->arch.sca)
445 goto out_err;
446 spin_lock(&kvm_lock);
447 sca_offset = (sca_offset + 16) & 0x7f0;
448 kvm->arch.sca = (struct sca_block *) ((char *) kvm->arch.sca + sca_offset);
449 spin_unlock(&kvm_lock);
450
451 sprintf(debug_name, "kvm-%u", current->pid);
452
453 kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long));
454 if (!kvm->arch.dbf)
455 goto out_nodbf;
456
457 if (kvm_s390_crypto_init(kvm) < 0)
458 goto out_crypto;
459
460 spin_lock_init(&kvm->arch.float_int.lock);
461 INIT_LIST_HEAD(&kvm->arch.float_int.list);
462 init_waitqueue_head(&kvm->arch.ipte_wq);
463 mutex_init(&kvm->arch.ipte_mutex);
464
465 debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
466 VM_EVENT(kvm, 3, "%s", "vm created");
467
468 if (type & KVM_VM_S390_UCONTROL) {
469 kvm->arch.gmap = NULL;
470 } else {
471 kvm->arch.gmap = gmap_alloc(current->mm, (1UL << 44) - 1);
472 if (!kvm->arch.gmap)
473 goto out_nogmap;
474 kvm->arch.gmap->private = kvm;
475 kvm->arch.gmap->pfault_enabled = 0;
476 }
477
478 kvm->arch.css_support = 0;
479 kvm->arch.use_irqchip = 0;
480
481 spin_lock_init(&kvm->arch.start_stop_lock);
482
483 return 0;
484 out_nogmap:
485 kfree(kvm->arch.crypto.crycb);
486 out_crypto:
487 debug_unregister(kvm->arch.dbf);
488 out_nodbf:
489 free_page((unsigned long)(kvm->arch.sca));
490 out_err:
491 return rc;
492 }
493
494 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
495 {
496 VCPU_EVENT(vcpu, 3, "%s", "free cpu");
497 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
498 kvm_s390_clear_local_irqs(vcpu);
499 kvm_clear_async_pf_completion_queue(vcpu);
500 if (!kvm_is_ucontrol(vcpu->kvm)) {
501 clear_bit(63 - vcpu->vcpu_id,
502 (unsigned long *) &vcpu->kvm->arch.sca->mcn);
503 if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
504 (__u64) vcpu->arch.sie_block)
505 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
506 }
507 smp_mb();
508
509 if (kvm_is_ucontrol(vcpu->kvm))
510 gmap_free(vcpu->arch.gmap);
511
512 if (kvm_s390_cmma_enabled(vcpu->kvm))
513 kvm_s390_vcpu_unsetup_cmma(vcpu);
514 free_page((unsigned long)(vcpu->arch.sie_block));
515
516 kvm_vcpu_uninit(vcpu);
517 kmem_cache_free(kvm_vcpu_cache, vcpu);
518 }
519
520 static void kvm_free_vcpus(struct kvm *kvm)
521 {
522 unsigned int i;
523 struct kvm_vcpu *vcpu;
524
525 kvm_for_each_vcpu(i, vcpu, kvm)
526 kvm_arch_vcpu_destroy(vcpu);
527
528 mutex_lock(&kvm->lock);
529 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
530 kvm->vcpus[i] = NULL;
531
532 atomic_set(&kvm->online_vcpus, 0);
533 mutex_unlock(&kvm->lock);
534 }
535
536 void kvm_arch_destroy_vm(struct kvm *kvm)
537 {
538 kvm_free_vcpus(kvm);
539 free_page((unsigned long)(kvm->arch.sca));
540 debug_unregister(kvm->arch.dbf);
541 kfree(kvm->arch.crypto.crycb);
542 if (!kvm_is_ucontrol(kvm))
543 gmap_free(kvm->arch.gmap);
544 kvm_s390_destroy_adapters(kvm);
545 kvm_s390_clear_float_irqs(kvm);
546 }
547
548 /* Section: vcpu related */
549 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
550 {
551 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
552 kvm_clear_async_pf_completion_queue(vcpu);
553 if (kvm_is_ucontrol(vcpu->kvm)) {
554 vcpu->arch.gmap = gmap_alloc(current->mm, -1UL);
555 if (!vcpu->arch.gmap)
556 return -ENOMEM;
557 vcpu->arch.gmap->private = vcpu->kvm;
558 return 0;
559 }
560
561 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
562 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
563 KVM_SYNC_GPRS |
564 KVM_SYNC_ACRS |
565 KVM_SYNC_CRS |
566 KVM_SYNC_ARCH0 |
567 KVM_SYNC_PFAULT;
568 return 0;
569 }
570
571 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
572 {
573 save_fp_ctl(&vcpu->arch.host_fpregs.fpc);
574 save_fp_regs(vcpu->arch.host_fpregs.fprs);
575 save_access_regs(vcpu->arch.host_acrs);
576 restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
577 restore_fp_regs(vcpu->arch.guest_fpregs.fprs);
578 restore_access_regs(vcpu->run->s.regs.acrs);
579 gmap_enable(vcpu->arch.gmap);
580 atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
581 }
582
583 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
584 {
585 atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
586 gmap_disable(vcpu->arch.gmap);
587 save_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
588 save_fp_regs(vcpu->arch.guest_fpregs.fprs);
589 save_access_regs(vcpu->run->s.regs.acrs);
590 restore_fp_ctl(&vcpu->arch.host_fpregs.fpc);
591 restore_fp_regs(vcpu->arch.host_fpregs.fprs);
592 restore_access_regs(vcpu->arch.host_acrs);
593 }
594
595 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
596 {
597 /* this equals initial cpu reset in pop, but we don't switch to ESA */
598 vcpu->arch.sie_block->gpsw.mask = 0UL;
599 vcpu->arch.sie_block->gpsw.addr = 0UL;
600 kvm_s390_set_prefix(vcpu, 0);
601 vcpu->arch.sie_block->cputm = 0UL;
602 vcpu->arch.sie_block->ckc = 0UL;
603 vcpu->arch.sie_block->todpr = 0;
604 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
605 vcpu->arch.sie_block->gcr[0] = 0xE0UL;
606 vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
607 vcpu->arch.guest_fpregs.fpc = 0;
608 asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc));
609 vcpu->arch.sie_block->gbea = 1;
610 vcpu->arch.sie_block->pp = 0;
611 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
612 kvm_clear_async_pf_completion_queue(vcpu);
613 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
614 kvm_s390_vcpu_stop(vcpu);
615 kvm_s390_clear_local_irqs(vcpu);
616 }
617
618 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
619 {
620 }
621
622 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
623 {
624 if (!test_vfacility(76))
625 return;
626
627 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
628 }
629
630 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
631 {
632 free_page(vcpu->arch.sie_block->cbrlo);
633 vcpu->arch.sie_block->cbrlo = 0;
634 }
635
636 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
637 {
638 vcpu->arch.sie_block->cbrlo = get_zeroed_page(GFP_KERNEL);
639 if (!vcpu->arch.sie_block->cbrlo)
640 return -ENOMEM;
641
642 vcpu->arch.sie_block->ecb2 |= 0x80;
643 vcpu->arch.sie_block->ecb2 &= ~0x08;
644 return 0;
645 }
646
647 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
648 {
649 int rc = 0;
650
651 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
652 CPUSTAT_SM |
653 CPUSTAT_STOPPED |
654 CPUSTAT_GED);
655 vcpu->arch.sie_block->ecb = 6;
656 if (test_vfacility(50) && test_vfacility(73))
657 vcpu->arch.sie_block->ecb |= 0x10;
658
659 vcpu->arch.sie_block->ecb2 = 8;
660 vcpu->arch.sie_block->eca = 0xD1002000U;
661 if (sclp_has_siif())
662 vcpu->arch.sie_block->eca |= 1;
663 vcpu->arch.sie_block->fac = (int) (long) vfacilities;
664 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE |
665 ICTL_TPROT;
666
667 if (kvm_s390_cmma_enabled(vcpu->kvm)) {
668 rc = kvm_s390_vcpu_setup_cmma(vcpu);
669 if (rc)
670 return rc;
671 }
672 hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
673 vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
674 get_cpu_id(&vcpu->arch.cpu_id);
675 vcpu->arch.cpu_id.version = 0xff;
676
677 kvm_s390_vcpu_crypto_setup(vcpu);
678
679 return rc;
680 }
681
682 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
683 unsigned int id)
684 {
685 struct kvm_vcpu *vcpu;
686 struct sie_page *sie_page;
687 int rc = -EINVAL;
688
689 if (id >= KVM_MAX_VCPUS)
690 goto out;
691
692 rc = -ENOMEM;
693
694 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
695 if (!vcpu)
696 goto out;
697
698 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL);
699 if (!sie_page)
700 goto out_free_cpu;
701
702 vcpu->arch.sie_block = &sie_page->sie_block;
703 vcpu->arch.sie_block->itdba = (unsigned long) &sie_page->itdb;
704
705 vcpu->arch.sie_block->icpua = id;
706 if (!kvm_is_ucontrol(kvm)) {
707 if (!kvm->arch.sca) {
708 WARN_ON_ONCE(1);
709 goto out_free_cpu;
710 }
711 if (!kvm->arch.sca->cpu[id].sda)
712 kvm->arch.sca->cpu[id].sda =
713 (__u64) vcpu->arch.sie_block;
714 vcpu->arch.sie_block->scaoh =
715 (__u32)(((__u64)kvm->arch.sca) >> 32);
716 vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
717 set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
718 }
719
720 spin_lock_init(&vcpu->arch.local_int.lock);
721 vcpu->arch.local_int.float_int = &kvm->arch.float_int;
722 vcpu->arch.local_int.wq = &vcpu->wq;
723 vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
724
725 rc = kvm_vcpu_init(vcpu, kvm, id);
726 if (rc)
727 goto out_free_sie_block;
728 VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
729 vcpu->arch.sie_block);
730 trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
731
732 return vcpu;
733 out_free_sie_block:
734 free_page((unsigned long)(vcpu->arch.sie_block));
735 out_free_cpu:
736 kmem_cache_free(kvm_vcpu_cache, vcpu);
737 out:
738 return ERR_PTR(rc);
739 }
740
741 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
742 {
743 return kvm_cpu_has_interrupt(vcpu);
744 }
745
746 void s390_vcpu_block(struct kvm_vcpu *vcpu)
747 {
748 atomic_set_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
749 }
750
751 void s390_vcpu_unblock(struct kvm_vcpu *vcpu)
752 {
753 atomic_clear_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
754 }
755
756 /*
757 * Kick a guest cpu out of SIE and wait until SIE is not running.
758 * If the CPU is not running (e.g. waiting as idle) the function will
759 * return immediately. */
760 void exit_sie(struct kvm_vcpu *vcpu)
761 {
762 atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
763 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
764 cpu_relax();
765 }
766
767 /* Kick a guest cpu out of SIE and prevent SIE-reentry */
768 void exit_sie_sync(struct kvm_vcpu *vcpu)
769 {
770 s390_vcpu_block(vcpu);
771 exit_sie(vcpu);
772 }
773
774 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address)
775 {
776 int i;
777 struct kvm *kvm = gmap->private;
778 struct kvm_vcpu *vcpu;
779
780 kvm_for_each_vcpu(i, vcpu, kvm) {
781 /* match against both prefix pages */
782 if (kvm_s390_get_prefix(vcpu) == (address & ~0x1000UL)) {
783 VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address);
784 kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
785 exit_sie_sync(vcpu);
786 }
787 }
788 }
789
790 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
791 {
792 /* kvm common code refers to this, but never calls it */
793 BUG();
794 return 0;
795 }
796
797 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
798 struct kvm_one_reg *reg)
799 {
800 int r = -EINVAL;
801
802 switch (reg->id) {
803 case KVM_REG_S390_TODPR:
804 r = put_user(vcpu->arch.sie_block->todpr,
805 (u32 __user *)reg->addr);
806 break;
807 case KVM_REG_S390_EPOCHDIFF:
808 r = put_user(vcpu->arch.sie_block->epoch,
809 (u64 __user *)reg->addr);
810 break;
811 case KVM_REG_S390_CPU_TIMER:
812 r = put_user(vcpu->arch.sie_block->cputm,
813 (u64 __user *)reg->addr);
814 break;
815 case KVM_REG_S390_CLOCK_COMP:
816 r = put_user(vcpu->arch.sie_block->ckc,
817 (u64 __user *)reg->addr);
818 break;
819 case KVM_REG_S390_PFTOKEN:
820 r = put_user(vcpu->arch.pfault_token,
821 (u64 __user *)reg->addr);
822 break;
823 case KVM_REG_S390_PFCOMPARE:
824 r = put_user(vcpu->arch.pfault_compare,
825 (u64 __user *)reg->addr);
826 break;
827 case KVM_REG_S390_PFSELECT:
828 r = put_user(vcpu->arch.pfault_select,
829 (u64 __user *)reg->addr);
830 break;
831 case KVM_REG_S390_PP:
832 r = put_user(vcpu->arch.sie_block->pp,
833 (u64 __user *)reg->addr);
834 break;
835 case KVM_REG_S390_GBEA:
836 r = put_user(vcpu->arch.sie_block->gbea,
837 (u64 __user *)reg->addr);
838 break;
839 default:
840 break;
841 }
842
843 return r;
844 }
845
846 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
847 struct kvm_one_reg *reg)
848 {
849 int r = -EINVAL;
850
851 switch (reg->id) {
852 case KVM_REG_S390_TODPR:
853 r = get_user(vcpu->arch.sie_block->todpr,
854 (u32 __user *)reg->addr);
855 break;
856 case KVM_REG_S390_EPOCHDIFF:
857 r = get_user(vcpu->arch.sie_block->epoch,
858 (u64 __user *)reg->addr);
859 break;
860 case KVM_REG_S390_CPU_TIMER:
861 r = get_user(vcpu->arch.sie_block->cputm,
862 (u64 __user *)reg->addr);
863 break;
864 case KVM_REG_S390_CLOCK_COMP:
865 r = get_user(vcpu->arch.sie_block->ckc,
866 (u64 __user *)reg->addr);
867 break;
868 case KVM_REG_S390_PFTOKEN:
869 r = get_user(vcpu->arch.pfault_token,
870 (u64 __user *)reg->addr);
871 break;
872 case KVM_REG_S390_PFCOMPARE:
873 r = get_user(vcpu->arch.pfault_compare,
874 (u64 __user *)reg->addr);
875 break;
876 case KVM_REG_S390_PFSELECT:
877 r = get_user(vcpu->arch.pfault_select,
878 (u64 __user *)reg->addr);
879 break;
880 case KVM_REG_S390_PP:
881 r = get_user(vcpu->arch.sie_block->pp,
882 (u64 __user *)reg->addr);
883 break;
884 case KVM_REG_S390_GBEA:
885 r = get_user(vcpu->arch.sie_block->gbea,
886 (u64 __user *)reg->addr);
887 break;
888 default:
889 break;
890 }
891
892 return r;
893 }
894
895 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
896 {
897 kvm_s390_vcpu_initial_reset(vcpu);
898 return 0;
899 }
900
901 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
902 {
903 memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
904 return 0;
905 }
906
907 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
908 {
909 memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
910 return 0;
911 }
912
913 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
914 struct kvm_sregs *sregs)
915 {
916 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
917 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
918 restore_access_regs(vcpu->run->s.regs.acrs);
919 return 0;
920 }
921
922 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
923 struct kvm_sregs *sregs)
924 {
925 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
926 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
927 return 0;
928 }
929
930 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
931 {
932 if (test_fp_ctl(fpu->fpc))
933 return -EINVAL;
934 memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
935 vcpu->arch.guest_fpregs.fpc = fpu->fpc;
936 restore_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
937 restore_fp_regs(vcpu->arch.guest_fpregs.fprs);
938 return 0;
939 }
940
941 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
942 {
943 memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
944 fpu->fpc = vcpu->arch.guest_fpregs.fpc;
945 return 0;
946 }
947
948 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
949 {
950 int rc = 0;
951
952 if (!is_vcpu_stopped(vcpu))
953 rc = -EBUSY;
954 else {
955 vcpu->run->psw_mask = psw.mask;
956 vcpu->run->psw_addr = psw.addr;
957 }
958 return rc;
959 }
960
961 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
962 struct kvm_translation *tr)
963 {
964 return -EINVAL; /* not implemented yet */
965 }
966
967 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
968 KVM_GUESTDBG_USE_HW_BP | \
969 KVM_GUESTDBG_ENABLE)
970
971 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
972 struct kvm_guest_debug *dbg)
973 {
974 int rc = 0;
975
976 vcpu->guest_debug = 0;
977 kvm_s390_clear_bp_data(vcpu);
978
979 if (dbg->control & ~VALID_GUESTDBG_FLAGS)
980 return -EINVAL;
981
982 if (dbg->control & KVM_GUESTDBG_ENABLE) {
983 vcpu->guest_debug = dbg->control;
984 /* enforce guest PER */
985 atomic_set_mask(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
986
987 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
988 rc = kvm_s390_import_bp_data(vcpu, dbg);
989 } else {
990 atomic_clear_mask(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
991 vcpu->arch.guestdbg.last_bp = 0;
992 }
993
994 if (rc) {
995 vcpu->guest_debug = 0;
996 kvm_s390_clear_bp_data(vcpu);
997 atomic_clear_mask(CPUSTAT_P, &vcpu->arch.sie_block->cpuflags);
998 }
999
1000 return rc;
1001 }
1002
1003 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
1004 struct kvm_mp_state *mp_state)
1005 {
1006 /* CHECK_STOP and LOAD are not supported yet */
1007 return is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
1008 KVM_MP_STATE_OPERATING;
1009 }
1010
1011 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
1012 struct kvm_mp_state *mp_state)
1013 {
1014 int rc = 0;
1015
1016 /* user space knows about this interface - let it control the state */
1017 vcpu->kvm->arch.user_cpu_state_ctrl = 1;
1018
1019 switch (mp_state->mp_state) {
1020 case KVM_MP_STATE_STOPPED:
1021 kvm_s390_vcpu_stop(vcpu);
1022 break;
1023 case KVM_MP_STATE_OPERATING:
1024 kvm_s390_vcpu_start(vcpu);
1025 break;
1026 case KVM_MP_STATE_LOAD:
1027 case KVM_MP_STATE_CHECK_STOP:
1028 /* fall through - CHECK_STOP and LOAD are not supported yet */
1029 default:
1030 rc = -ENXIO;
1031 }
1032
1033 return rc;
1034 }
1035
1036 bool kvm_s390_cmma_enabled(struct kvm *kvm)
1037 {
1038 if (!MACHINE_IS_LPAR)
1039 return false;
1040 /* only enable for z10 and later */
1041 if (!MACHINE_HAS_EDAT1)
1042 return false;
1043 if (!kvm->arch.use_cmma)
1044 return false;
1045 return true;
1046 }
1047
1048 static bool ibs_enabled(struct kvm_vcpu *vcpu)
1049 {
1050 return atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_IBS;
1051 }
1052
1053 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
1054 {
1055 retry:
1056 s390_vcpu_unblock(vcpu);
1057 /*
1058 * We use MMU_RELOAD just to re-arm the ipte notifier for the
1059 * guest prefix page. gmap_ipte_notify will wait on the ptl lock.
1060 * This ensures that the ipte instruction for this request has
1061 * already finished. We might race against a second unmapper that
1062 * wants to set the blocking bit. Lets just retry the request loop.
1063 */
1064 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
1065 int rc;
1066 rc = gmap_ipte_notify(vcpu->arch.gmap,
1067 kvm_s390_get_prefix(vcpu),
1068 PAGE_SIZE * 2);
1069 if (rc)
1070 return rc;
1071 goto retry;
1072 }
1073
1074 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
1075 vcpu->arch.sie_block->ihcpu = 0xffff;
1076 goto retry;
1077 }
1078
1079 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
1080 if (!ibs_enabled(vcpu)) {
1081 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
1082 atomic_set_mask(CPUSTAT_IBS,
1083 &vcpu->arch.sie_block->cpuflags);
1084 }
1085 goto retry;
1086 }
1087
1088 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
1089 if (ibs_enabled(vcpu)) {
1090 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
1091 atomic_clear_mask(CPUSTAT_IBS,
1092 &vcpu->arch.sie_block->cpuflags);
1093 }
1094 goto retry;
1095 }
1096
1097 /* nothing to do, just clear the request */
1098 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
1099
1100 return 0;
1101 }
1102
1103 /**
1104 * kvm_arch_fault_in_page - fault-in guest page if necessary
1105 * @vcpu: The corresponding virtual cpu
1106 * @gpa: Guest physical address
1107 * @writable: Whether the page should be writable or not
1108 *
1109 * Make sure that a guest page has been faulted-in on the host.
1110 *
1111 * Return: Zero on success, negative error code otherwise.
1112 */
1113 long kvm_arch_fault_in_page(struct kvm_vcpu *vcpu, gpa_t gpa, int writable)
1114 {
1115 return gmap_fault(vcpu->arch.gmap, gpa,
1116 writable ? FAULT_FLAG_WRITE : 0);
1117 }
1118
1119 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
1120 unsigned long token)
1121 {
1122 struct kvm_s390_interrupt inti;
1123 struct kvm_s390_irq irq;
1124
1125 if (start_token) {
1126 irq.u.ext.ext_params2 = token;
1127 irq.type = KVM_S390_INT_PFAULT_INIT;
1128 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
1129 } else {
1130 inti.type = KVM_S390_INT_PFAULT_DONE;
1131 inti.parm64 = token;
1132 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
1133 }
1134 }
1135
1136 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
1137 struct kvm_async_pf *work)
1138 {
1139 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
1140 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
1141 }
1142
1143 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
1144 struct kvm_async_pf *work)
1145 {
1146 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
1147 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
1148 }
1149
1150 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
1151 struct kvm_async_pf *work)
1152 {
1153 /* s390 will always inject the page directly */
1154 }
1155
1156 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
1157 {
1158 /*
1159 * s390 will always inject the page directly,
1160 * but we still want check_async_completion to cleanup
1161 */
1162 return true;
1163 }
1164
1165 static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
1166 {
1167 hva_t hva;
1168 struct kvm_arch_async_pf arch;
1169 int rc;
1170
1171 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
1172 return 0;
1173 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
1174 vcpu->arch.pfault_compare)
1175 return 0;
1176 if (psw_extint_disabled(vcpu))
1177 return 0;
1178 if (kvm_cpu_has_interrupt(vcpu))
1179 return 0;
1180 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
1181 return 0;
1182 if (!vcpu->arch.gmap->pfault_enabled)
1183 return 0;
1184
1185 hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(current->thread.gmap_addr));
1186 hva += current->thread.gmap_addr & ~PAGE_MASK;
1187 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
1188 return 0;
1189
1190 rc = kvm_setup_async_pf(vcpu, current->thread.gmap_addr, hva, &arch);
1191 return rc;
1192 }
1193
1194 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
1195 {
1196 int rc, cpuflags;
1197
1198 /*
1199 * On s390 notifications for arriving pages will be delivered directly
1200 * to the guest but the house keeping for completed pfaults is
1201 * handled outside the worker.
1202 */
1203 kvm_check_async_pf_completion(vcpu);
1204
1205 memcpy(&vcpu->arch.sie_block->gg14, &vcpu->run->s.regs.gprs[14], 16);
1206
1207 if (need_resched())
1208 schedule();
1209
1210 if (test_cpu_flag(CIF_MCCK_PENDING))
1211 s390_handle_mcck();
1212
1213 if (!kvm_is_ucontrol(vcpu->kvm)) {
1214 rc = kvm_s390_deliver_pending_interrupts(vcpu);
1215 if (rc)
1216 return rc;
1217 }
1218
1219 rc = kvm_s390_handle_requests(vcpu);
1220 if (rc)
1221 return rc;
1222
1223 if (guestdbg_enabled(vcpu)) {
1224 kvm_s390_backup_guest_per_regs(vcpu);
1225 kvm_s390_patch_guest_per_regs(vcpu);
1226 }
1227
1228 vcpu->arch.sie_block->icptcode = 0;
1229 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
1230 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
1231 trace_kvm_s390_sie_enter(vcpu, cpuflags);
1232
1233 return 0;
1234 }
1235
1236 static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason)
1237 {
1238 int rc = -1;
1239
1240 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
1241 vcpu->arch.sie_block->icptcode);
1242 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
1243
1244 if (guestdbg_enabled(vcpu))
1245 kvm_s390_restore_guest_per_regs(vcpu);
1246
1247 if (exit_reason >= 0) {
1248 rc = 0;
1249 } else if (kvm_is_ucontrol(vcpu->kvm)) {
1250 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
1251 vcpu->run->s390_ucontrol.trans_exc_code =
1252 current->thread.gmap_addr;
1253 vcpu->run->s390_ucontrol.pgm_code = 0x10;
1254 rc = -EREMOTE;
1255
1256 } else if (current->thread.gmap_pfault) {
1257 trace_kvm_s390_major_guest_pfault(vcpu);
1258 current->thread.gmap_pfault = 0;
1259 if (kvm_arch_setup_async_pf(vcpu)) {
1260 rc = 0;
1261 } else {
1262 gpa_t gpa = current->thread.gmap_addr;
1263 rc = kvm_arch_fault_in_page(vcpu, gpa, 1);
1264 }
1265 }
1266
1267 if (rc == -1) {
1268 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
1269 trace_kvm_s390_sie_fault(vcpu);
1270 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
1271 }
1272
1273 memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16);
1274
1275 if (rc == 0) {
1276 if (kvm_is_ucontrol(vcpu->kvm))
1277 /* Don't exit for host interrupts. */
1278 rc = vcpu->arch.sie_block->icptcode ? -EOPNOTSUPP : 0;
1279 else
1280 rc = kvm_handle_sie_intercept(vcpu);
1281 }
1282
1283 return rc;
1284 }
1285
1286 static int __vcpu_run(struct kvm_vcpu *vcpu)
1287 {
1288 int rc, exit_reason;
1289
1290 /*
1291 * We try to hold kvm->srcu during most of vcpu_run (except when run-
1292 * ning the guest), so that memslots (and other stuff) are protected
1293 */
1294 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1295
1296 do {
1297 rc = vcpu_pre_run(vcpu);
1298 if (rc)
1299 break;
1300
1301 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1302 /*
1303 * As PF_VCPU will be used in fault handler, between
1304 * guest_enter and guest_exit should be no uaccess.
1305 */
1306 preempt_disable();
1307 kvm_guest_enter();
1308 preempt_enable();
1309 exit_reason = sie64a(vcpu->arch.sie_block,
1310 vcpu->run->s.regs.gprs);
1311 kvm_guest_exit();
1312 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
1313
1314 rc = vcpu_post_run(vcpu, exit_reason);
1315 } while (!signal_pending(current) && !guestdbg_exit_pending(vcpu) && !rc);
1316
1317 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
1318 return rc;
1319 }
1320
1321 static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1322 {
1323 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
1324 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
1325 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
1326 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
1327 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
1328 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
1329 /* some control register changes require a tlb flush */
1330 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1331 }
1332 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
1333 vcpu->arch.sie_block->cputm = kvm_run->s.regs.cputm;
1334 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
1335 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
1336 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
1337 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
1338 }
1339 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
1340 vcpu->arch.pfault_token = kvm_run->s.regs.pft;
1341 vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
1342 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
1343 }
1344 kvm_run->kvm_dirty_regs = 0;
1345 }
1346
1347 static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1348 {
1349 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
1350 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
1351 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
1352 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
1353 kvm_run->s.regs.cputm = vcpu->arch.sie_block->cputm;
1354 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
1355 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
1356 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
1357 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
1358 kvm_run->s.regs.pft = vcpu->arch.pfault_token;
1359 kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
1360 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
1361 }
1362
1363 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1364 {
1365 int rc;
1366 sigset_t sigsaved;
1367
1368 if (guestdbg_exit_pending(vcpu)) {
1369 kvm_s390_prepare_debug_exit(vcpu);
1370 return 0;
1371 }
1372
1373 if (vcpu->sigset_active)
1374 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
1375
1376 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
1377 kvm_s390_vcpu_start(vcpu);
1378 } else if (is_vcpu_stopped(vcpu)) {
1379 pr_err_ratelimited("kvm-s390: can't run stopped vcpu %d\n",
1380 vcpu->vcpu_id);
1381 return -EINVAL;
1382 }
1383
1384 sync_regs(vcpu, kvm_run);
1385
1386 might_fault();
1387 rc = __vcpu_run(vcpu);
1388
1389 if (signal_pending(current) && !rc) {
1390 kvm_run->exit_reason = KVM_EXIT_INTR;
1391 rc = -EINTR;
1392 }
1393
1394 if (guestdbg_exit_pending(vcpu) && !rc) {
1395 kvm_s390_prepare_debug_exit(vcpu);
1396 rc = 0;
1397 }
1398
1399 if (rc == -EOPNOTSUPP) {
1400 /* intercept cannot be handled in-kernel, prepare kvm-run */
1401 kvm_run->exit_reason = KVM_EXIT_S390_SIEIC;
1402 kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
1403 kvm_run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
1404 kvm_run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
1405 rc = 0;
1406 }
1407
1408 if (rc == -EREMOTE) {
1409 /* intercept was handled, but userspace support is needed
1410 * kvm_run has been prepared by the handler */
1411 rc = 0;
1412 }
1413
1414 store_regs(vcpu, kvm_run);
1415
1416 if (vcpu->sigset_active)
1417 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
1418
1419 vcpu->stat.exit_userspace++;
1420 return rc;
1421 }
1422
1423 /*
1424 * store status at address
1425 * we use have two special cases:
1426 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
1427 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
1428 */
1429 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
1430 {
1431 unsigned char archmode = 1;
1432 unsigned int px;
1433 u64 clkcomp;
1434 int rc;
1435
1436 if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
1437 if (write_guest_abs(vcpu, 163, &archmode, 1))
1438 return -EFAULT;
1439 gpa = SAVE_AREA_BASE;
1440 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
1441 if (write_guest_real(vcpu, 163, &archmode, 1))
1442 return -EFAULT;
1443 gpa = kvm_s390_real_to_abs(vcpu, SAVE_AREA_BASE);
1444 }
1445 rc = write_guest_abs(vcpu, gpa + offsetof(struct save_area, fp_regs),
1446 vcpu->arch.guest_fpregs.fprs, 128);
1447 rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, gp_regs),
1448 vcpu->run->s.regs.gprs, 128);
1449 rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, psw),
1450 &vcpu->arch.sie_block->gpsw, 16);
1451 px = kvm_s390_get_prefix(vcpu);
1452 rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, pref_reg),
1453 &px, 4);
1454 rc |= write_guest_abs(vcpu,
1455 gpa + offsetof(struct save_area, fp_ctrl_reg),
1456 &vcpu->arch.guest_fpregs.fpc, 4);
1457 rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, tod_reg),
1458 &vcpu->arch.sie_block->todpr, 4);
1459 rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, timer),
1460 &vcpu->arch.sie_block->cputm, 8);
1461 clkcomp = vcpu->arch.sie_block->ckc >> 8;
1462 rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, clk_cmp),
1463 &clkcomp, 8);
1464 rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, acc_regs),
1465 &vcpu->run->s.regs.acrs, 64);
1466 rc |= write_guest_abs(vcpu, gpa + offsetof(struct save_area, ctrl_regs),
1467 &vcpu->arch.sie_block->gcr, 128);
1468 return rc ? -EFAULT : 0;
1469 }
1470
1471 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
1472 {
1473 /*
1474 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
1475 * copying in vcpu load/put. Lets update our copies before we save
1476 * it into the save area
1477 */
1478 save_fp_ctl(&vcpu->arch.guest_fpregs.fpc);
1479 save_fp_regs(vcpu->arch.guest_fpregs.fprs);
1480 save_access_regs(vcpu->run->s.regs.acrs);
1481
1482 return kvm_s390_store_status_unloaded(vcpu, addr);
1483 }
1484
1485 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
1486 {
1487 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
1488 kvm_make_request(KVM_REQ_DISABLE_IBS, vcpu);
1489 exit_sie_sync(vcpu);
1490 }
1491
1492 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
1493 {
1494 unsigned int i;
1495 struct kvm_vcpu *vcpu;
1496
1497 kvm_for_each_vcpu(i, vcpu, kvm) {
1498 __disable_ibs_on_vcpu(vcpu);
1499 }
1500 }
1501
1502 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
1503 {
1504 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
1505 kvm_make_request(KVM_REQ_ENABLE_IBS, vcpu);
1506 exit_sie_sync(vcpu);
1507 }
1508
1509 void kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
1510 {
1511 int i, online_vcpus, started_vcpus = 0;
1512
1513 if (!is_vcpu_stopped(vcpu))
1514 return;
1515
1516 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
1517 /* Only one cpu at a time may enter/leave the STOPPED state. */
1518 spin_lock(&vcpu->kvm->arch.start_stop_lock);
1519 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
1520
1521 for (i = 0; i < online_vcpus; i++) {
1522 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i]))
1523 started_vcpus++;
1524 }
1525
1526 if (started_vcpus == 0) {
1527 /* we're the only active VCPU -> speed it up */
1528 __enable_ibs_on_vcpu(vcpu);
1529 } else if (started_vcpus == 1) {
1530 /*
1531 * As we are starting a second VCPU, we have to disable
1532 * the IBS facility on all VCPUs to remove potentially
1533 * oustanding ENABLE requests.
1534 */
1535 __disable_ibs_on_all_vcpus(vcpu->kvm);
1536 }
1537
1538 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
1539 /*
1540 * Another VCPU might have used IBS while we were offline.
1541 * Let's play safe and flush the VCPU at startup.
1542 */
1543 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1544 spin_unlock(&vcpu->kvm->arch.start_stop_lock);
1545 return;
1546 }
1547
1548 void kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
1549 {
1550 int i, online_vcpus, started_vcpus = 0;
1551 struct kvm_vcpu *started_vcpu = NULL;
1552
1553 if (is_vcpu_stopped(vcpu))
1554 return;
1555
1556 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
1557 /* Only one cpu at a time may enter/leave the STOPPED state. */
1558 spin_lock(&vcpu->kvm->arch.start_stop_lock);
1559 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
1560
1561 /* Need to lock access to action_bits to avoid a SIGP race condition */
1562 spin_lock(&vcpu->arch.local_int.lock);
1563 atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
1564
1565 /* SIGP STOP and SIGP STOP AND STORE STATUS has been fully processed */
1566 vcpu->arch.local_int.action_bits &=
1567 ~(ACTION_STOP_ON_STOP | ACTION_STORE_ON_STOP);
1568 spin_unlock(&vcpu->arch.local_int.lock);
1569
1570 __disable_ibs_on_vcpu(vcpu);
1571
1572 for (i = 0; i < online_vcpus; i++) {
1573 if (!is_vcpu_stopped(vcpu->kvm->vcpus[i])) {
1574 started_vcpus++;
1575 started_vcpu = vcpu->kvm->vcpus[i];
1576 }
1577 }
1578
1579 if (started_vcpus == 1) {
1580 /*
1581 * As we only have one VCPU left, we want to enable the
1582 * IBS facility for that VCPU to speed it up.
1583 */
1584 __enable_ibs_on_vcpu(started_vcpu);
1585 }
1586
1587 spin_unlock(&vcpu->kvm->arch.start_stop_lock);
1588 return;
1589 }
1590
1591 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
1592 struct kvm_enable_cap *cap)
1593 {
1594 int r;
1595
1596 if (cap->flags)
1597 return -EINVAL;
1598
1599 switch (cap->cap) {
1600 case KVM_CAP_S390_CSS_SUPPORT:
1601 if (!vcpu->kvm->arch.css_support) {
1602 vcpu->kvm->arch.css_support = 1;
1603 trace_kvm_s390_enable_css(vcpu->kvm);
1604 }
1605 r = 0;
1606 break;
1607 default:
1608 r = -EINVAL;
1609 break;
1610 }
1611 return r;
1612 }
1613
1614 long kvm_arch_vcpu_ioctl(struct file *filp,
1615 unsigned int ioctl, unsigned long arg)
1616 {
1617 struct kvm_vcpu *vcpu = filp->private_data;
1618 void __user *argp = (void __user *)arg;
1619 int idx;
1620 long r;
1621
1622 switch (ioctl) {
1623 case KVM_S390_INTERRUPT: {
1624 struct kvm_s390_interrupt s390int;
1625 struct kvm_s390_irq s390irq;
1626
1627 r = -EFAULT;
1628 if (copy_from_user(&s390int, argp, sizeof(s390int)))
1629 break;
1630 if (s390int_to_s390irq(&s390int, &s390irq))
1631 return -EINVAL;
1632 r = kvm_s390_inject_vcpu(vcpu, &s390irq);
1633 break;
1634 }
1635 case KVM_S390_STORE_STATUS:
1636 idx = srcu_read_lock(&vcpu->kvm->srcu);
1637 r = kvm_s390_vcpu_store_status(vcpu, arg);
1638 srcu_read_unlock(&vcpu->kvm->srcu, idx);
1639 break;
1640 case KVM_S390_SET_INITIAL_PSW: {
1641 psw_t psw;
1642
1643 r = -EFAULT;
1644 if (copy_from_user(&psw, argp, sizeof(psw)))
1645 break;
1646 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
1647 break;
1648 }
1649 case KVM_S390_INITIAL_RESET:
1650 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
1651 break;
1652 case KVM_SET_ONE_REG:
1653 case KVM_GET_ONE_REG: {
1654 struct kvm_one_reg reg;
1655 r = -EFAULT;
1656 if (copy_from_user(&reg, argp, sizeof(reg)))
1657 break;
1658 if (ioctl == KVM_SET_ONE_REG)
1659 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
1660 else
1661 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
1662 break;
1663 }
1664 #ifdef CONFIG_KVM_S390_UCONTROL
1665 case KVM_S390_UCAS_MAP: {
1666 struct kvm_s390_ucas_mapping ucasmap;
1667
1668 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
1669 r = -EFAULT;
1670 break;
1671 }
1672
1673 if (!kvm_is_ucontrol(vcpu->kvm)) {
1674 r = -EINVAL;
1675 break;
1676 }
1677
1678 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
1679 ucasmap.vcpu_addr, ucasmap.length);
1680 break;
1681 }
1682 case KVM_S390_UCAS_UNMAP: {
1683 struct kvm_s390_ucas_mapping ucasmap;
1684
1685 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
1686 r = -EFAULT;
1687 break;
1688 }
1689
1690 if (!kvm_is_ucontrol(vcpu->kvm)) {
1691 r = -EINVAL;
1692 break;
1693 }
1694
1695 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
1696 ucasmap.length);
1697 break;
1698 }
1699 #endif
1700 case KVM_S390_VCPU_FAULT: {
1701 r = gmap_fault(vcpu->arch.gmap, arg, 0);
1702 break;
1703 }
1704 case KVM_ENABLE_CAP:
1705 {
1706 struct kvm_enable_cap cap;
1707 r = -EFAULT;
1708 if (copy_from_user(&cap, argp, sizeof(cap)))
1709 break;
1710 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
1711 break;
1712 }
1713 default:
1714 r = -ENOTTY;
1715 }
1716 return r;
1717 }
1718
1719 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
1720 {
1721 #ifdef CONFIG_KVM_S390_UCONTROL
1722 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
1723 && (kvm_is_ucontrol(vcpu->kvm))) {
1724 vmf->page = virt_to_page(vcpu->arch.sie_block);
1725 get_page(vmf->page);
1726 return 0;
1727 }
1728 #endif
1729 return VM_FAULT_SIGBUS;
1730 }
1731
1732 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
1733 unsigned long npages)
1734 {
1735 return 0;
1736 }
1737
1738 /* Section: memory related */
1739 int kvm_arch_prepare_memory_region(struct kvm *kvm,
1740 struct kvm_memory_slot *memslot,
1741 struct kvm_userspace_memory_region *mem,
1742 enum kvm_mr_change change)
1743 {
1744 /* A few sanity checks. We can have memory slots which have to be
1745 located/ended at a segment boundary (1MB). The memory in userland is
1746 ok to be fragmented into various different vmas. It is okay to mmap()
1747 and munmap() stuff in this slot after doing this call at any time */
1748
1749 if (mem->userspace_addr & 0xffffful)
1750 return -EINVAL;
1751
1752 if (mem->memory_size & 0xffffful)
1753 return -EINVAL;
1754
1755 return 0;
1756 }
1757
1758 void kvm_arch_commit_memory_region(struct kvm *kvm,
1759 struct kvm_userspace_memory_region *mem,
1760 const struct kvm_memory_slot *old,
1761 enum kvm_mr_change change)
1762 {
1763 int rc;
1764
1765 /* If the basics of the memslot do not change, we do not want
1766 * to update the gmap. Every update causes several unnecessary
1767 * segment translation exceptions. This is usually handled just
1768 * fine by the normal fault handler + gmap, but it will also
1769 * cause faults on the prefix page of running guest CPUs.
1770 */
1771 if (old->userspace_addr == mem->userspace_addr &&
1772 old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
1773 old->npages * PAGE_SIZE == mem->memory_size)
1774 return;
1775
1776 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
1777 mem->guest_phys_addr, mem->memory_size);
1778 if (rc)
1779 printk(KERN_WARNING "kvm-s390: failed to commit memory region\n");
1780 return;
1781 }
1782
1783 static int __init kvm_s390_init(void)
1784 {
1785 int ret;
1786 ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1787 if (ret)
1788 return ret;
1789
1790 /*
1791 * guests can ask for up to 255+1 double words, we need a full page
1792 * to hold the maximum amount of facilities. On the other hand, we
1793 * only set facilities that are known to work in KVM.
1794 */
1795 vfacilities = (unsigned long *) get_zeroed_page(GFP_KERNEL|GFP_DMA);
1796 if (!vfacilities) {
1797 kvm_exit();
1798 return -ENOMEM;
1799 }
1800 memcpy(vfacilities, S390_lowcore.stfle_fac_list, 16);
1801 vfacilities[0] &= 0xff82fffbf47c2000UL;
1802 vfacilities[1] &= 0x005c000000000000UL;
1803 return 0;
1804 }
1805
1806 static void __exit kvm_s390_exit(void)
1807 {
1808 free_page((unsigned long) vfacilities);
1809 kvm_exit();
1810 }
1811
1812 module_init(kvm_s390_init);
1813 module_exit(kvm_s390_exit);
1814
1815 /*
1816 * Enable autoloading of the kvm module.
1817 * Note that we add the module alias here instead of virt/kvm/kvm_main.c
1818 * since x86 takes a different approach.
1819 */
1820 #include <linux/miscdevice.h>
1821 MODULE_ALIAS_MISCDEV(KVM_MINOR);
1822 MODULE_ALIAS("devname:kvm");
Linux kernel - Deliverables
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