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Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[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 */
15
16 #include <linux/compiler.h>
17 #include <linux/err.h>
18 #include <linux/fs.h>
19 #include <linux/hrtimer.h>
20 #include <linux/init.h>
21 #include <linux/kvm.h>
22 #include <linux/kvm_host.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <asm/asm-offsets.h>
27 #include <asm/lowcore.h>
28 #include <asm/pgtable.h>
29 #include <asm/nmi.h>
30 #include <asm/switch_to.h>
31 #include <asm/facility.h>
32 #include <asm/sclp.h>
33 #include "kvm-s390.h"
34 #include "gaccess.h"
35
36 #define CREATE_TRACE_POINTS
37 #include "trace.h"
38 #include "trace-s390.h"
39
40 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
41
42 struct kvm_stats_debugfs_item debugfs_entries[] = {
43 { "userspace_handled", VCPU_STAT(exit_userspace) },
44 { "exit_null", VCPU_STAT(exit_null) },
45 { "exit_validity", VCPU_STAT(exit_validity) },
46 { "exit_stop_request", VCPU_STAT(exit_stop_request) },
47 { "exit_external_request", VCPU_STAT(exit_external_request) },
48 { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
49 { "exit_instruction", VCPU_STAT(exit_instruction) },
50 { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
51 { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
52 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
53 { "instruction_lctl", VCPU_STAT(instruction_lctl) },
54 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
55 { "deliver_external_call", VCPU_STAT(deliver_external_call) },
56 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
57 { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
58 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
59 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
60 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
61 { "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
62 { "exit_wait_state", VCPU_STAT(exit_wait_state) },
63 { "instruction_pfmf", VCPU_STAT(instruction_pfmf) },
64 { "instruction_stidp", VCPU_STAT(instruction_stidp) },
65 { "instruction_spx", VCPU_STAT(instruction_spx) },
66 { "instruction_stpx", VCPU_STAT(instruction_stpx) },
67 { "instruction_stap", VCPU_STAT(instruction_stap) },
68 { "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
69 { "instruction_stsch", VCPU_STAT(instruction_stsch) },
70 { "instruction_chsc", VCPU_STAT(instruction_chsc) },
71 { "instruction_stsi", VCPU_STAT(instruction_stsi) },
72 { "instruction_stfl", VCPU_STAT(instruction_stfl) },
73 { "instruction_tprot", VCPU_STAT(instruction_tprot) },
74 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
75 { "instruction_sigp_sense_running", VCPU_STAT(instruction_sigp_sense_running) },
76 { "instruction_sigp_external_call", VCPU_STAT(instruction_sigp_external_call) },
77 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
78 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
79 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
80 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
81 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
82 { "diagnose_10", VCPU_STAT(diagnose_10) },
83 { "diagnose_44", VCPU_STAT(diagnose_44) },
84 { "diagnose_9c", VCPU_STAT(diagnose_9c) },
85 { NULL }
86 };
87
88 unsigned long *vfacilities;
89 static struct gmap_notifier gmap_notifier;
90
91 /* test availability of vfacility */
92 static inline int test_vfacility(unsigned long nr)
93 {
94 return __test_facility(nr, (void *) vfacilities);
95 }
96
97 /* Section: not file related */
98 int kvm_arch_hardware_enable(void *garbage)
99 {
100 /* every s390 is virtualization enabled ;-) */
101 return 0;
102 }
103
104 void kvm_arch_hardware_disable(void *garbage)
105 {
106 }
107
108 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address);
109
110 int kvm_arch_hardware_setup(void)
111 {
112 gmap_notifier.notifier_call = kvm_gmap_notifier;
113 gmap_register_ipte_notifier(&gmap_notifier);
114 return 0;
115 }
116
117 void kvm_arch_hardware_unsetup(void)
118 {
119 gmap_unregister_ipte_notifier(&gmap_notifier);
120 }
121
122 void kvm_arch_check_processor_compat(void *rtn)
123 {
124 }
125
126 int kvm_arch_init(void *opaque)
127 {
128 return 0;
129 }
130
131 void kvm_arch_exit(void)
132 {
133 }
134
135 /* Section: device related */
136 long kvm_arch_dev_ioctl(struct file *filp,
137 unsigned int ioctl, unsigned long arg)
138 {
139 if (ioctl == KVM_S390_ENABLE_SIE)
140 return s390_enable_sie();
141 return -EINVAL;
142 }
143
144 int kvm_dev_ioctl_check_extension(long ext)
145 {
146 int r;
147
148 switch (ext) {
149 case KVM_CAP_S390_PSW:
150 case KVM_CAP_S390_GMAP:
151 case KVM_CAP_SYNC_MMU:
152 #ifdef CONFIG_KVM_S390_UCONTROL
153 case KVM_CAP_S390_UCONTROL:
154 #endif
155 case KVM_CAP_SYNC_REGS:
156 case KVM_CAP_ONE_REG:
157 case KVM_CAP_ENABLE_CAP:
158 case KVM_CAP_S390_CSS_SUPPORT:
159 case KVM_CAP_IOEVENTFD:
160 r = 1;
161 break;
162 case KVM_CAP_NR_VCPUS:
163 case KVM_CAP_MAX_VCPUS:
164 r = KVM_MAX_VCPUS;
165 break;
166 case KVM_CAP_NR_MEMSLOTS:
167 r = KVM_USER_MEM_SLOTS;
168 break;
169 case KVM_CAP_S390_COW:
170 r = MACHINE_HAS_ESOP;
171 break;
172 default:
173 r = 0;
174 }
175 return r;
176 }
177
178 /* Section: vm related */
179 /*
180 * Get (and clear) the dirty memory log for a memory slot.
181 */
182 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
183 struct kvm_dirty_log *log)
184 {
185 return 0;
186 }
187
188 long kvm_arch_vm_ioctl(struct file *filp,
189 unsigned int ioctl, unsigned long arg)
190 {
191 struct kvm *kvm = filp->private_data;
192 void __user *argp = (void __user *)arg;
193 int r;
194
195 switch (ioctl) {
196 case KVM_S390_INTERRUPT: {
197 struct kvm_s390_interrupt s390int;
198
199 r = -EFAULT;
200 if (copy_from_user(&s390int, argp, sizeof(s390int)))
201 break;
202 r = kvm_s390_inject_vm(kvm, &s390int);
203 break;
204 }
205 default:
206 r = -ENOTTY;
207 }
208
209 return r;
210 }
211
212 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
213 {
214 int rc;
215 char debug_name[16];
216
217 rc = -EINVAL;
218 #ifdef CONFIG_KVM_S390_UCONTROL
219 if (type & ~KVM_VM_S390_UCONTROL)
220 goto out_err;
221 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
222 goto out_err;
223 #else
224 if (type)
225 goto out_err;
226 #endif
227
228 rc = s390_enable_sie();
229 if (rc)
230 goto out_err;
231
232 rc = -ENOMEM;
233
234 kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
235 if (!kvm->arch.sca)
236 goto out_err;
237
238 sprintf(debug_name, "kvm-%u", current->pid);
239
240 kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long));
241 if (!kvm->arch.dbf)
242 goto out_nodbf;
243
244 spin_lock_init(&kvm->arch.float_int.lock);
245 INIT_LIST_HEAD(&kvm->arch.float_int.list);
246
247 debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
248 VM_EVENT(kvm, 3, "%s", "vm created");
249
250 if (type & KVM_VM_S390_UCONTROL) {
251 kvm->arch.gmap = NULL;
252 } else {
253 kvm->arch.gmap = gmap_alloc(current->mm);
254 if (!kvm->arch.gmap)
255 goto out_nogmap;
256 kvm->arch.gmap->private = kvm;
257 }
258
259 kvm->arch.css_support = 0;
260
261 return 0;
262 out_nogmap:
263 debug_unregister(kvm->arch.dbf);
264 out_nodbf:
265 free_page((unsigned long)(kvm->arch.sca));
266 out_err:
267 return rc;
268 }
269
270 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
271 {
272 VCPU_EVENT(vcpu, 3, "%s", "free cpu");
273 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
274 if (!kvm_is_ucontrol(vcpu->kvm)) {
275 clear_bit(63 - vcpu->vcpu_id,
276 (unsigned long *) &vcpu->kvm->arch.sca->mcn);
277 if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda ==
278 (__u64) vcpu->arch.sie_block)
279 vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0;
280 }
281 smp_mb();
282
283 if (kvm_is_ucontrol(vcpu->kvm))
284 gmap_free(vcpu->arch.gmap);
285
286 free_page((unsigned long)(vcpu->arch.sie_block));
287 kvm_vcpu_uninit(vcpu);
288 kmem_cache_free(kvm_vcpu_cache, vcpu);
289 }
290
291 static void kvm_free_vcpus(struct kvm *kvm)
292 {
293 unsigned int i;
294 struct kvm_vcpu *vcpu;
295
296 kvm_for_each_vcpu(i, vcpu, kvm)
297 kvm_arch_vcpu_destroy(vcpu);
298
299 mutex_lock(&kvm->lock);
300 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
301 kvm->vcpus[i] = NULL;
302
303 atomic_set(&kvm->online_vcpus, 0);
304 mutex_unlock(&kvm->lock);
305 }
306
307 void kvm_arch_sync_events(struct kvm *kvm)
308 {
309 }
310
311 void kvm_arch_destroy_vm(struct kvm *kvm)
312 {
313 kvm_free_vcpus(kvm);
314 free_page((unsigned long)(kvm->arch.sca));
315 debug_unregister(kvm->arch.dbf);
316 if (!kvm_is_ucontrol(kvm))
317 gmap_free(kvm->arch.gmap);
318 }
319
320 /* Section: vcpu related */
321 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
322 {
323 if (kvm_is_ucontrol(vcpu->kvm)) {
324 vcpu->arch.gmap = gmap_alloc(current->mm);
325 if (!vcpu->arch.gmap)
326 return -ENOMEM;
327 vcpu->arch.gmap->private = vcpu->kvm;
328 return 0;
329 }
330
331 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
332 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
333 KVM_SYNC_GPRS |
334 KVM_SYNC_ACRS |
335 KVM_SYNC_CRS;
336 return 0;
337 }
338
339 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
340 {
341 /* Nothing todo */
342 }
343
344 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
345 {
346 save_fp_regs(&vcpu->arch.host_fpregs);
347 save_access_regs(vcpu->arch.host_acrs);
348 vcpu->arch.guest_fpregs.fpc &= FPC_VALID_MASK;
349 restore_fp_regs(&vcpu->arch.guest_fpregs);
350 restore_access_regs(vcpu->run->s.regs.acrs);
351 gmap_enable(vcpu->arch.gmap);
352 atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
353 }
354
355 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
356 {
357 atomic_clear_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
358 gmap_disable(vcpu->arch.gmap);
359 save_fp_regs(&vcpu->arch.guest_fpregs);
360 save_access_regs(vcpu->run->s.regs.acrs);
361 restore_fp_regs(&vcpu->arch.host_fpregs);
362 restore_access_regs(vcpu->arch.host_acrs);
363 }
364
365 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
366 {
367 /* this equals initial cpu reset in pop, but we don't switch to ESA */
368 vcpu->arch.sie_block->gpsw.mask = 0UL;
369 vcpu->arch.sie_block->gpsw.addr = 0UL;
370 kvm_s390_set_prefix(vcpu, 0);
371 vcpu->arch.sie_block->cputm = 0UL;
372 vcpu->arch.sie_block->ckc = 0UL;
373 vcpu->arch.sie_block->todpr = 0;
374 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
375 vcpu->arch.sie_block->gcr[0] = 0xE0UL;
376 vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
377 vcpu->arch.guest_fpregs.fpc = 0;
378 asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc));
379 vcpu->arch.sie_block->gbea = 1;
380 atomic_set_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
381 }
382
383 int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
384 {
385 return 0;
386 }
387
388 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
389 {
390 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
391 CPUSTAT_SM |
392 CPUSTAT_STOPPED |
393 CPUSTAT_GED);
394 vcpu->arch.sie_block->ecb = 6;
395 vcpu->arch.sie_block->ecb2 = 8;
396 vcpu->arch.sie_block->eca = 0xC1002001U;
397 vcpu->arch.sie_block->fac = (int) (long) vfacilities;
398 hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS);
399 tasklet_init(&vcpu->arch.tasklet, kvm_s390_tasklet,
400 (unsigned long) vcpu);
401 vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
402 get_cpu_id(&vcpu->arch.cpu_id);
403 vcpu->arch.cpu_id.version = 0xff;
404 return 0;
405 }
406
407 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
408 unsigned int id)
409 {
410 struct kvm_vcpu *vcpu;
411 int rc = -EINVAL;
412
413 if (id >= KVM_MAX_VCPUS)
414 goto out;
415
416 rc = -ENOMEM;
417
418 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
419 if (!vcpu)
420 goto out;
421
422 vcpu->arch.sie_block = (struct kvm_s390_sie_block *)
423 get_zeroed_page(GFP_KERNEL);
424
425 if (!vcpu->arch.sie_block)
426 goto out_free_cpu;
427
428 vcpu->arch.sie_block->icpua = id;
429 if (!kvm_is_ucontrol(kvm)) {
430 if (!kvm->arch.sca) {
431 WARN_ON_ONCE(1);
432 goto out_free_cpu;
433 }
434 if (!kvm->arch.sca->cpu[id].sda)
435 kvm->arch.sca->cpu[id].sda =
436 (__u64) vcpu->arch.sie_block;
437 vcpu->arch.sie_block->scaoh =
438 (__u32)(((__u64)kvm->arch.sca) >> 32);
439 vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
440 set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn);
441 }
442
443 spin_lock_init(&vcpu->arch.local_int.lock);
444 INIT_LIST_HEAD(&vcpu->arch.local_int.list);
445 vcpu->arch.local_int.float_int = &kvm->arch.float_int;
446 spin_lock(&kvm->arch.float_int.lock);
447 kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int;
448 vcpu->arch.local_int.wq = &vcpu->wq;
449 vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
450 spin_unlock(&kvm->arch.float_int.lock);
451
452 rc = kvm_vcpu_init(vcpu, kvm, id);
453 if (rc)
454 goto out_free_sie_block;
455 VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
456 vcpu->arch.sie_block);
457 trace_kvm_s390_create_vcpu(id, vcpu, vcpu->arch.sie_block);
458
459 return vcpu;
460 out_free_sie_block:
461 free_page((unsigned long)(vcpu->arch.sie_block));
462 out_free_cpu:
463 kmem_cache_free(kvm_vcpu_cache, vcpu);
464 out:
465 return ERR_PTR(rc);
466 }
467
468 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
469 {
470 /* kvm common code refers to this, but never calls it */
471 BUG();
472 return 0;
473 }
474
475 void s390_vcpu_block(struct kvm_vcpu *vcpu)
476 {
477 atomic_set_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
478 }
479
480 void s390_vcpu_unblock(struct kvm_vcpu *vcpu)
481 {
482 atomic_clear_mask(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
483 }
484
485 /*
486 * Kick a guest cpu out of SIE and wait until SIE is not running.
487 * If the CPU is not running (e.g. waiting as idle) the function will
488 * return immediately. */
489 void exit_sie(struct kvm_vcpu *vcpu)
490 {
491 atomic_set_mask(CPUSTAT_STOP_INT, &vcpu->arch.sie_block->cpuflags);
492 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
493 cpu_relax();
494 }
495
496 /* Kick a guest cpu out of SIE and prevent SIE-reentry */
497 void exit_sie_sync(struct kvm_vcpu *vcpu)
498 {
499 s390_vcpu_block(vcpu);
500 exit_sie(vcpu);
501 }
502
503 static void kvm_gmap_notifier(struct gmap *gmap, unsigned long address)
504 {
505 int i;
506 struct kvm *kvm = gmap->private;
507 struct kvm_vcpu *vcpu;
508
509 kvm_for_each_vcpu(i, vcpu, kvm) {
510 /* match against both prefix pages */
511 if (vcpu->arch.sie_block->prefix == (address & ~0x1000UL)) {
512 VCPU_EVENT(vcpu, 2, "gmap notifier for %lx", address);
513 kvm_make_request(KVM_REQ_MMU_RELOAD, vcpu);
514 exit_sie_sync(vcpu);
515 }
516 }
517 }
518
519 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
520 {
521 /* kvm common code refers to this, but never calls it */
522 BUG();
523 return 0;
524 }
525
526 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
527 struct kvm_one_reg *reg)
528 {
529 int r = -EINVAL;
530
531 switch (reg->id) {
532 case KVM_REG_S390_TODPR:
533 r = put_user(vcpu->arch.sie_block->todpr,
534 (u32 __user *)reg->addr);
535 break;
536 case KVM_REG_S390_EPOCHDIFF:
537 r = put_user(vcpu->arch.sie_block->epoch,
538 (u64 __user *)reg->addr);
539 break;
540 case KVM_REG_S390_CPU_TIMER:
541 r = put_user(vcpu->arch.sie_block->cputm,
542 (u64 __user *)reg->addr);
543 break;
544 case KVM_REG_S390_CLOCK_COMP:
545 r = put_user(vcpu->arch.sie_block->ckc,
546 (u64 __user *)reg->addr);
547 break;
548 default:
549 break;
550 }
551
552 return r;
553 }
554
555 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
556 struct kvm_one_reg *reg)
557 {
558 int r = -EINVAL;
559
560 switch (reg->id) {
561 case KVM_REG_S390_TODPR:
562 r = get_user(vcpu->arch.sie_block->todpr,
563 (u32 __user *)reg->addr);
564 break;
565 case KVM_REG_S390_EPOCHDIFF:
566 r = get_user(vcpu->arch.sie_block->epoch,
567 (u64 __user *)reg->addr);
568 break;
569 case KVM_REG_S390_CPU_TIMER:
570 r = get_user(vcpu->arch.sie_block->cputm,
571 (u64 __user *)reg->addr);
572 break;
573 case KVM_REG_S390_CLOCK_COMP:
574 r = get_user(vcpu->arch.sie_block->ckc,
575 (u64 __user *)reg->addr);
576 break;
577 default:
578 break;
579 }
580
581 return r;
582 }
583
584 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
585 {
586 kvm_s390_vcpu_initial_reset(vcpu);
587 return 0;
588 }
589
590 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
591 {
592 memcpy(&vcpu->run->s.regs.gprs, &regs->gprs, sizeof(regs->gprs));
593 return 0;
594 }
595
596 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
597 {
598 memcpy(&regs->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
599 return 0;
600 }
601
602 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
603 struct kvm_sregs *sregs)
604 {
605 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
606 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
607 restore_access_regs(vcpu->run->s.regs.acrs);
608 return 0;
609 }
610
611 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
612 struct kvm_sregs *sregs)
613 {
614 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
615 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
616 return 0;
617 }
618
619 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
620 {
621 memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
622 vcpu->arch.guest_fpregs.fpc = fpu->fpc & FPC_VALID_MASK;
623 restore_fp_regs(&vcpu->arch.guest_fpregs);
624 return 0;
625 }
626
627 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
628 {
629 memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
630 fpu->fpc = vcpu->arch.guest_fpregs.fpc;
631 return 0;
632 }
633
634 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
635 {
636 int rc = 0;
637
638 if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_STOPPED))
639 rc = -EBUSY;
640 else {
641 vcpu->run->psw_mask = psw.mask;
642 vcpu->run->psw_addr = psw.addr;
643 }
644 return rc;
645 }
646
647 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
648 struct kvm_translation *tr)
649 {
650 return -EINVAL; /* not implemented yet */
651 }
652
653 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
654 struct kvm_guest_debug *dbg)
655 {
656 return -EINVAL; /* not implemented yet */
657 }
658
659 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
660 struct kvm_mp_state *mp_state)
661 {
662 return -EINVAL; /* not implemented yet */
663 }
664
665 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
666 struct kvm_mp_state *mp_state)
667 {
668 return -EINVAL; /* not implemented yet */
669 }
670
671 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
672 {
673 /*
674 * We use MMU_RELOAD just to re-arm the ipte notifier for the
675 * guest prefix page. gmap_ipte_notify will wait on the ptl lock.
676 * This ensures that the ipte instruction for this request has
677 * already finished. We might race against a second unmapper that
678 * wants to set the blocking bit. Lets just retry the request loop.
679 */
680 while (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu)) {
681 int rc;
682 rc = gmap_ipte_notify(vcpu->arch.gmap,
683 vcpu->arch.sie_block->prefix,
684 PAGE_SIZE * 2);
685 if (rc)
686 return rc;
687 s390_vcpu_unblock(vcpu);
688 }
689 return 0;
690 }
691
692 static int __vcpu_run(struct kvm_vcpu *vcpu)
693 {
694 int rc;
695
696 memcpy(&vcpu->arch.sie_block->gg14, &vcpu->run->s.regs.gprs[14], 16);
697
698 if (need_resched())
699 schedule();
700
701 if (test_thread_flag(TIF_MCCK_PENDING))
702 s390_handle_mcck();
703
704 if (!kvm_is_ucontrol(vcpu->kvm))
705 kvm_s390_deliver_pending_interrupts(vcpu);
706
707 rc = kvm_s390_handle_requests(vcpu);
708 if (rc)
709 return rc;
710
711 vcpu->arch.sie_block->icptcode = 0;
712 VCPU_EVENT(vcpu, 6, "entering sie flags %x",
713 atomic_read(&vcpu->arch.sie_block->cpuflags));
714 trace_kvm_s390_sie_enter(vcpu,
715 atomic_read(&vcpu->arch.sie_block->cpuflags));
716
717 /*
718 * As PF_VCPU will be used in fault handler, between guest_enter
719 * and guest_exit should be no uaccess.
720 */
721 preempt_disable();
722 kvm_guest_enter();
723 preempt_enable();
724 rc = sie64a(vcpu->arch.sie_block, vcpu->run->s.regs.gprs);
725 kvm_guest_exit();
726
727 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
728 vcpu->arch.sie_block->icptcode);
729 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
730
731 if (rc > 0)
732 rc = 0;
733 if (rc < 0) {
734 if (kvm_is_ucontrol(vcpu->kvm)) {
735 rc = SIE_INTERCEPT_UCONTROL;
736 } else {
737 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
738 trace_kvm_s390_sie_fault(vcpu);
739 rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
740 }
741 }
742
743 memcpy(&vcpu->run->s.regs.gprs[14], &vcpu->arch.sie_block->gg14, 16);
744 return rc;
745 }
746
747 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
748 {
749 int rc;
750 sigset_t sigsaved;
751
752 rerun_vcpu:
753 if (vcpu->sigset_active)
754 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
755
756 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
757
758 BUG_ON(vcpu->kvm->arch.float_int.local_int[vcpu->vcpu_id] == NULL);
759
760 switch (kvm_run->exit_reason) {
761 case KVM_EXIT_S390_SIEIC:
762 case KVM_EXIT_UNKNOWN:
763 case KVM_EXIT_INTR:
764 case KVM_EXIT_S390_RESET:
765 case KVM_EXIT_S390_UCONTROL:
766 case KVM_EXIT_S390_TSCH:
767 break;
768 default:
769 BUG();
770 }
771
772 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
773 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
774 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX) {
775 kvm_run->kvm_dirty_regs &= ~KVM_SYNC_PREFIX;
776 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
777 }
778 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
779 kvm_run->kvm_dirty_regs &= ~KVM_SYNC_CRS;
780 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
781 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
782 }
783
784 might_fault();
785
786 do {
787 rc = __vcpu_run(vcpu);
788 if (rc)
789 break;
790 if (kvm_is_ucontrol(vcpu->kvm))
791 rc = -EOPNOTSUPP;
792 else
793 rc = kvm_handle_sie_intercept(vcpu);
794 } while (!signal_pending(current) && !rc);
795
796 if (rc == SIE_INTERCEPT_RERUNVCPU)
797 goto rerun_vcpu;
798
799 if (signal_pending(current) && !rc) {
800 kvm_run->exit_reason = KVM_EXIT_INTR;
801 rc = -EINTR;
802 }
803
804 #ifdef CONFIG_KVM_S390_UCONTROL
805 if (rc == SIE_INTERCEPT_UCONTROL) {
806 kvm_run->exit_reason = KVM_EXIT_S390_UCONTROL;
807 kvm_run->s390_ucontrol.trans_exc_code =
808 current->thread.gmap_addr;
809 kvm_run->s390_ucontrol.pgm_code = 0x10;
810 rc = 0;
811 }
812 #endif
813
814 if (rc == -EOPNOTSUPP) {
815 /* intercept cannot be handled in-kernel, prepare kvm-run */
816 kvm_run->exit_reason = KVM_EXIT_S390_SIEIC;
817 kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
818 kvm_run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
819 kvm_run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
820 rc = 0;
821 }
822
823 if (rc == -EREMOTE) {
824 /* intercept was handled, but userspace support is needed
825 * kvm_run has been prepared by the handler */
826 rc = 0;
827 }
828
829 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
830 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
831 kvm_run->s.regs.prefix = vcpu->arch.sie_block->prefix;
832 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
833
834 if (vcpu->sigset_active)
835 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
836
837 vcpu->stat.exit_userspace++;
838 return rc;
839 }
840
841 static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, void *from,
842 unsigned long n, int prefix)
843 {
844 if (prefix)
845 return copy_to_guest(vcpu, guestdest, from, n);
846 else
847 return copy_to_guest_absolute(vcpu, guestdest, from, n);
848 }
849
850 /*
851 * store status at address
852 * we use have two special cases:
853 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
854 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
855 */
856 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
857 {
858 unsigned char archmode = 1;
859 int prefix;
860
861 if (addr == KVM_S390_STORE_STATUS_NOADDR) {
862 if (copy_to_guest_absolute(vcpu, 163ul, &archmode, 1))
863 return -EFAULT;
864 addr = SAVE_AREA_BASE;
865 prefix = 0;
866 } else if (addr == KVM_S390_STORE_STATUS_PREFIXED) {
867 if (copy_to_guest(vcpu, 163ul, &archmode, 1))
868 return -EFAULT;
869 addr = SAVE_AREA_BASE;
870 prefix = 1;
871 } else
872 prefix = 0;
873
874 /*
875 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
876 * copying in vcpu load/put. Lets update our copies before we save
877 * it into the save area
878 */
879 save_fp_regs(&vcpu->arch.guest_fpregs);
880 save_access_regs(vcpu->run->s.regs.acrs);
881
882 if (__guestcopy(vcpu, addr + offsetof(struct save_area, fp_regs),
883 vcpu->arch.guest_fpregs.fprs, 128, prefix))
884 return -EFAULT;
885
886 if (__guestcopy(vcpu, addr + offsetof(struct save_area, gp_regs),
887 vcpu->run->s.regs.gprs, 128, prefix))
888 return -EFAULT;
889
890 if (__guestcopy(vcpu, addr + offsetof(struct save_area, psw),
891 &vcpu->arch.sie_block->gpsw, 16, prefix))
892 return -EFAULT;
893
894 if (__guestcopy(vcpu, addr + offsetof(struct save_area, pref_reg),
895 &vcpu->arch.sie_block->prefix, 4, prefix))
896 return -EFAULT;
897
898 if (__guestcopy(vcpu,
899 addr + offsetof(struct save_area, fp_ctrl_reg),
900 &vcpu->arch.guest_fpregs.fpc, 4, prefix))
901 return -EFAULT;
902
903 if (__guestcopy(vcpu, addr + offsetof(struct save_area, tod_reg),
904 &vcpu->arch.sie_block->todpr, 4, prefix))
905 return -EFAULT;
906
907 if (__guestcopy(vcpu, addr + offsetof(struct save_area, timer),
908 &vcpu->arch.sie_block->cputm, 8, prefix))
909 return -EFAULT;
910
911 if (__guestcopy(vcpu, addr + offsetof(struct save_area, clk_cmp),
912 &vcpu->arch.sie_block->ckc, 8, prefix))
913 return -EFAULT;
914
915 if (__guestcopy(vcpu, addr + offsetof(struct save_area, acc_regs),
916 &vcpu->run->s.regs.acrs, 64, prefix))
917 return -EFAULT;
918
919 if (__guestcopy(vcpu,
920 addr + offsetof(struct save_area, ctrl_regs),
921 &vcpu->arch.sie_block->gcr, 128, prefix))
922 return -EFAULT;
923 return 0;
924 }
925
926 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
927 struct kvm_enable_cap *cap)
928 {
929 int r;
930
931 if (cap->flags)
932 return -EINVAL;
933
934 switch (cap->cap) {
935 case KVM_CAP_S390_CSS_SUPPORT:
936 if (!vcpu->kvm->arch.css_support) {
937 vcpu->kvm->arch.css_support = 1;
938 trace_kvm_s390_enable_css(vcpu->kvm);
939 }
940 r = 0;
941 break;
942 default:
943 r = -EINVAL;
944 break;
945 }
946 return r;
947 }
948
949 long kvm_arch_vcpu_ioctl(struct file *filp,
950 unsigned int ioctl, unsigned long arg)
951 {
952 struct kvm_vcpu *vcpu = filp->private_data;
953 void __user *argp = (void __user *)arg;
954 long r;
955
956 switch (ioctl) {
957 case KVM_S390_INTERRUPT: {
958 struct kvm_s390_interrupt s390int;
959
960 r = -EFAULT;
961 if (copy_from_user(&s390int, argp, sizeof(s390int)))
962 break;
963 r = kvm_s390_inject_vcpu(vcpu, &s390int);
964 break;
965 }
966 case KVM_S390_STORE_STATUS:
967 r = kvm_s390_vcpu_store_status(vcpu, arg);
968 break;
969 case KVM_S390_SET_INITIAL_PSW: {
970 psw_t psw;
971
972 r = -EFAULT;
973 if (copy_from_user(&psw, argp, sizeof(psw)))
974 break;
975 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
976 break;
977 }
978 case KVM_S390_INITIAL_RESET:
979 r = kvm_arch_vcpu_ioctl_initial_reset(vcpu);
980 break;
981 case KVM_SET_ONE_REG:
982 case KVM_GET_ONE_REG: {
983 struct kvm_one_reg reg;
984 r = -EFAULT;
985 if (copy_from_user(&reg, argp, sizeof(reg)))
986 break;
987 if (ioctl == KVM_SET_ONE_REG)
988 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, &reg);
989 else
990 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, &reg);
991 break;
992 }
993 #ifdef CONFIG_KVM_S390_UCONTROL
994 case KVM_S390_UCAS_MAP: {
995 struct kvm_s390_ucas_mapping ucasmap;
996
997 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
998 r = -EFAULT;
999 break;
1000 }
1001
1002 if (!kvm_is_ucontrol(vcpu->kvm)) {
1003 r = -EINVAL;
1004 break;
1005 }
1006
1007 r = gmap_map_segment(vcpu->arch.gmap, ucasmap.user_addr,
1008 ucasmap.vcpu_addr, ucasmap.length);
1009 break;
1010 }
1011 case KVM_S390_UCAS_UNMAP: {
1012 struct kvm_s390_ucas_mapping ucasmap;
1013
1014 if (copy_from_user(&ucasmap, argp, sizeof(ucasmap))) {
1015 r = -EFAULT;
1016 break;
1017 }
1018
1019 if (!kvm_is_ucontrol(vcpu->kvm)) {
1020 r = -EINVAL;
1021 break;
1022 }
1023
1024 r = gmap_unmap_segment(vcpu->arch.gmap, ucasmap.vcpu_addr,
1025 ucasmap.length);
1026 break;
1027 }
1028 #endif
1029 case KVM_S390_VCPU_FAULT: {
1030 r = gmap_fault(arg, vcpu->arch.gmap);
1031 if (!IS_ERR_VALUE(r))
1032 r = 0;
1033 break;
1034 }
1035 case KVM_ENABLE_CAP:
1036 {
1037 struct kvm_enable_cap cap;
1038 r = -EFAULT;
1039 if (copy_from_user(&cap, argp, sizeof(cap)))
1040 break;
1041 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
1042 break;
1043 }
1044 default:
1045 r = -ENOTTY;
1046 }
1047 return r;
1048 }
1049
1050 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
1051 {
1052 #ifdef CONFIG_KVM_S390_UCONTROL
1053 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
1054 && (kvm_is_ucontrol(vcpu->kvm))) {
1055 vmf->page = virt_to_page(vcpu->arch.sie_block);
1056 get_page(vmf->page);
1057 return 0;
1058 }
1059 #endif
1060 return VM_FAULT_SIGBUS;
1061 }
1062
1063 void kvm_arch_free_memslot(struct kvm_memory_slot *free,
1064 struct kvm_memory_slot *dont)
1065 {
1066 }
1067
1068 int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
1069 {
1070 return 0;
1071 }
1072
1073 void kvm_arch_memslots_updated(struct kvm *kvm)
1074 {
1075 }
1076
1077 /* Section: memory related */
1078 int kvm_arch_prepare_memory_region(struct kvm *kvm,
1079 struct kvm_memory_slot *memslot,
1080 struct kvm_userspace_memory_region *mem,
1081 enum kvm_mr_change change)
1082 {
1083 /* A few sanity checks. We can have memory slots which have to be
1084 located/ended at a segment boundary (1MB). The memory in userland is
1085 ok to be fragmented into various different vmas. It is okay to mmap()
1086 and munmap() stuff in this slot after doing this call at any time */
1087
1088 if (mem->userspace_addr & 0xffffful)
1089 return -EINVAL;
1090
1091 if (mem->memory_size & 0xffffful)
1092 return -EINVAL;
1093
1094 return 0;
1095 }
1096
1097 void kvm_arch_commit_memory_region(struct kvm *kvm,
1098 struct kvm_userspace_memory_region *mem,
1099 const struct kvm_memory_slot *old,
1100 enum kvm_mr_change change)
1101 {
1102 int rc;
1103
1104 /* If the basics of the memslot do not change, we do not want
1105 * to update the gmap. Every update causes several unnecessary
1106 * segment translation exceptions. This is usually handled just
1107 * fine by the normal fault handler + gmap, but it will also
1108 * cause faults on the prefix page of running guest CPUs.
1109 */
1110 if (old->userspace_addr == mem->userspace_addr &&
1111 old->base_gfn * PAGE_SIZE == mem->guest_phys_addr &&
1112 old->npages * PAGE_SIZE == mem->memory_size)
1113 return;
1114
1115 rc = gmap_map_segment(kvm->arch.gmap, mem->userspace_addr,
1116 mem->guest_phys_addr, mem->memory_size);
1117 if (rc)
1118 printk(KERN_WARNING "kvm-s390: failed to commit memory region\n");
1119 return;
1120 }
1121
1122 void kvm_arch_flush_shadow_all(struct kvm *kvm)
1123 {
1124 }
1125
1126 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
1127 struct kvm_memory_slot *slot)
1128 {
1129 }
1130
1131 static int __init kvm_s390_init(void)
1132 {
1133 int ret;
1134 ret = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);
1135 if (ret)
1136 return ret;
1137
1138 /*
1139 * guests can ask for up to 255+1 double words, we need a full page
1140 * to hold the maximum amount of facilities. On the other hand, we
1141 * only set facilities that are known to work in KVM.
1142 */
1143 vfacilities = (unsigned long *) get_zeroed_page(GFP_KERNEL|GFP_DMA);
1144 if (!vfacilities) {
1145 kvm_exit();
1146 return -ENOMEM;
1147 }
1148 memcpy(vfacilities, S390_lowcore.stfle_fac_list, 16);
1149 vfacilities[0] &= 0xff82fff3f47c0000UL;
1150 vfacilities[1] &= 0x001c000000000000UL;
1151 return 0;
1152 }
1153
1154 static void __exit kvm_s390_exit(void)
1155 {
1156 free_page((unsigned long) vfacilities);
1157 kvm_exit();
1158 }
1159
1160 module_init(kvm_s390_init);
1161 module_exit(kvm_s390_exit);
1162
1163 /*
1164 * Enable autoloading of the kvm module.
1165 * Note that we add the module alias here instead of virt/kvm/kvm_main.c
1166 * since x86 takes a different approach.
1167 */
1168 #include <linux/miscdevice.h>
1169 MODULE_ALIAS_MISCDEV(KVM_MINOR);
1170 MODULE_ALIAS("devname:kvm");
Linux kernel - Deliverables
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