sh: hibernation support
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / s390 / kvm / kvm-s390.c
1 /*
2 * s390host.c -- hosting zSeries kernel virtual machines
3 *
4 * Copyright IBM Corp. 2008
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 */
14
15 #include <linux/compiler.h>
16 #include <linux/err.h>
17 #include <linux/fs.h>
18 #include <linux/init.h>
19 #include <linux/kvm.h>
20 #include <linux/kvm_host.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/timer.h>
24 #include <asm/lowcore.h>
25 #include <asm/pgtable.h>
26
27 #include "kvm-s390.h"
28 #include "gaccess.h"
29
30 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
31
32 struct kvm_stats_debugfs_item debugfs_entries[] = {
33 { "userspace_handled", VCPU_STAT(exit_userspace) },
34 { "exit_null", VCPU_STAT(exit_null) },
35 { "exit_validity", VCPU_STAT(exit_validity) },
36 { "exit_stop_request", VCPU_STAT(exit_stop_request) },
37 { "exit_external_request", VCPU_STAT(exit_external_request) },
38 { "exit_external_interrupt", VCPU_STAT(exit_external_interrupt) },
39 { "exit_instruction", VCPU_STAT(exit_instruction) },
40 { "exit_program_interruption", VCPU_STAT(exit_program_interruption) },
41 { "exit_instr_and_program_int", VCPU_STAT(exit_instr_and_program) },
42 { "instruction_lctlg", VCPU_STAT(instruction_lctlg) },
43 { "instruction_lctl", VCPU_STAT(instruction_lctl) },
44 { "deliver_emergency_signal", VCPU_STAT(deliver_emergency_signal) },
45 { "deliver_service_signal", VCPU_STAT(deliver_service_signal) },
46 { "deliver_virtio_interrupt", VCPU_STAT(deliver_virtio_interrupt) },
47 { "deliver_stop_signal", VCPU_STAT(deliver_stop_signal) },
48 { "deliver_prefix_signal", VCPU_STAT(deliver_prefix_signal) },
49 { "deliver_restart_signal", VCPU_STAT(deliver_restart_signal) },
50 { "deliver_program_interruption", VCPU_STAT(deliver_program_int) },
51 { "exit_wait_state", VCPU_STAT(exit_wait_state) },
52 { "instruction_stidp", VCPU_STAT(instruction_stidp) },
53 { "instruction_spx", VCPU_STAT(instruction_spx) },
54 { "instruction_stpx", VCPU_STAT(instruction_stpx) },
55 { "instruction_stap", VCPU_STAT(instruction_stap) },
56 { "instruction_storage_key", VCPU_STAT(instruction_storage_key) },
57 { "instruction_stsch", VCPU_STAT(instruction_stsch) },
58 { "instruction_chsc", VCPU_STAT(instruction_chsc) },
59 { "instruction_stsi", VCPU_STAT(instruction_stsi) },
60 { "instruction_stfl", VCPU_STAT(instruction_stfl) },
61 { "instruction_sigp_sense", VCPU_STAT(instruction_sigp_sense) },
62 { "instruction_sigp_emergency", VCPU_STAT(instruction_sigp_emergency) },
63 { "instruction_sigp_stop", VCPU_STAT(instruction_sigp_stop) },
64 { "instruction_sigp_set_arch", VCPU_STAT(instruction_sigp_arch) },
65 { "instruction_sigp_set_prefix", VCPU_STAT(instruction_sigp_prefix) },
66 { "instruction_sigp_restart", VCPU_STAT(instruction_sigp_restart) },
67 { "diagnose_44", VCPU_STAT(diagnose_44) },
68 { NULL }
69 };
70
71
72 /* Section: not file related */
73 void kvm_arch_hardware_enable(void *garbage)
74 {
75 /* every s390 is virtualization enabled ;-) */
76 }
77
78 void kvm_arch_hardware_disable(void *garbage)
79 {
80 }
81
82 int kvm_arch_hardware_setup(void)
83 {
84 return 0;
85 }
86
87 void kvm_arch_hardware_unsetup(void)
88 {
89 }
90
91 void kvm_arch_check_processor_compat(void *rtn)
92 {
93 }
94
95 int kvm_arch_init(void *opaque)
96 {
97 return 0;
98 }
99
100 void kvm_arch_exit(void)
101 {
102 }
103
104 /* Section: device related */
105 long kvm_arch_dev_ioctl(struct file *filp,
106 unsigned int ioctl, unsigned long arg)
107 {
108 if (ioctl == KVM_S390_ENABLE_SIE)
109 return s390_enable_sie();
110 return -EINVAL;
111 }
112
113 int kvm_dev_ioctl_check_extension(long ext)
114 {
115 switch (ext) {
116 default:
117 return 0;
118 }
119 }
120
121 /* Section: vm related */
122 /*
123 * Get (and clear) the dirty memory log for a memory slot.
124 */
125 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
126 struct kvm_dirty_log *log)
127 {
128 return 0;
129 }
130
131 long kvm_arch_vm_ioctl(struct file *filp,
132 unsigned int ioctl, unsigned long arg)
133 {
134 struct kvm *kvm = filp->private_data;
135 void __user *argp = (void __user *)arg;
136 int r;
137
138 switch (ioctl) {
139 case KVM_S390_INTERRUPT: {
140 struct kvm_s390_interrupt s390int;
141
142 r = -EFAULT;
143 if (copy_from_user(&s390int, argp, sizeof(s390int)))
144 break;
145 r = kvm_s390_inject_vm(kvm, &s390int);
146 break;
147 }
148 default:
149 r = -EINVAL;
150 }
151
152 return r;
153 }
154
155 struct kvm *kvm_arch_create_vm(void)
156 {
157 struct kvm *kvm;
158 int rc;
159 char debug_name[16];
160
161 rc = s390_enable_sie();
162 if (rc)
163 goto out_nokvm;
164
165 rc = -ENOMEM;
166 kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
167 if (!kvm)
168 goto out_nokvm;
169
170 kvm->arch.sca = (struct sca_block *) get_zeroed_page(GFP_KERNEL);
171 if (!kvm->arch.sca)
172 goto out_nosca;
173
174 sprintf(debug_name, "kvm-%u", current->pid);
175
176 kvm->arch.dbf = debug_register(debug_name, 8, 2, 8 * sizeof(long));
177 if (!kvm->arch.dbf)
178 goto out_nodbf;
179
180 spin_lock_init(&kvm->arch.float_int.lock);
181 INIT_LIST_HEAD(&kvm->arch.float_int.list);
182
183 debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
184 VM_EVENT(kvm, 3, "%s", "vm created");
185
186 return kvm;
187 out_nodbf:
188 free_page((unsigned long)(kvm->arch.sca));
189 out_nosca:
190 kfree(kvm);
191 out_nokvm:
192 return ERR_PTR(rc);
193 }
194
195 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
196 {
197 VCPU_EVENT(vcpu, 3, "%s", "free cpu");
198 free_page((unsigned long)(vcpu->arch.sie_block));
199 kvm_vcpu_uninit(vcpu);
200 kfree(vcpu);
201 }
202
203 static void kvm_free_vcpus(struct kvm *kvm)
204 {
205 unsigned int i;
206
207 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
208 if (kvm->vcpus[i]) {
209 kvm_arch_vcpu_destroy(kvm->vcpus[i]);
210 kvm->vcpus[i] = NULL;
211 }
212 }
213 }
214
215 void kvm_arch_destroy_vm(struct kvm *kvm)
216 {
217 kvm_free_vcpus(kvm);
218 kvm_free_physmem(kvm);
219 free_page((unsigned long)(kvm->arch.sca));
220 debug_unregister(kvm->arch.dbf);
221 kfree(kvm);
222 }
223
224 /* Section: vcpu related */
225 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
226 {
227 return 0;
228 }
229
230 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
231 {
232 /* Nothing todo */
233 }
234
235 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
236 {
237 save_fp_regs(&vcpu->arch.host_fpregs);
238 save_access_regs(vcpu->arch.host_acrs);
239 vcpu->arch.guest_fpregs.fpc &= FPC_VALID_MASK;
240 restore_fp_regs(&vcpu->arch.guest_fpregs);
241 restore_access_regs(vcpu->arch.guest_acrs);
242 }
243
244 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
245 {
246 save_fp_regs(&vcpu->arch.guest_fpregs);
247 save_access_regs(vcpu->arch.guest_acrs);
248 restore_fp_regs(&vcpu->arch.host_fpregs);
249 restore_access_regs(vcpu->arch.host_acrs);
250 }
251
252 static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
253 {
254 /* this equals initial cpu reset in pop, but we don't switch to ESA */
255 vcpu->arch.sie_block->gpsw.mask = 0UL;
256 vcpu->arch.sie_block->gpsw.addr = 0UL;
257 vcpu->arch.sie_block->prefix = 0UL;
258 vcpu->arch.sie_block->ihcpu = 0xffff;
259 vcpu->arch.sie_block->cputm = 0UL;
260 vcpu->arch.sie_block->ckc = 0UL;
261 vcpu->arch.sie_block->todpr = 0;
262 memset(vcpu->arch.sie_block->gcr, 0, 16 * sizeof(__u64));
263 vcpu->arch.sie_block->gcr[0] = 0xE0UL;
264 vcpu->arch.sie_block->gcr[14] = 0xC2000000UL;
265 vcpu->arch.guest_fpregs.fpc = 0;
266 asm volatile("lfpc %0" : : "Q" (vcpu->arch.guest_fpregs.fpc));
267 vcpu->arch.sie_block->gbea = 1;
268 }
269
270 /* The current code can have up to 256 pages for virtio */
271 #define VIRTIODESCSPACE (256ul * 4096ul)
272
273 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
274 {
275 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH);
276 vcpu->arch.sie_block->gmslm = vcpu->kvm->arch.guest_memsize +
277 vcpu->kvm->arch.guest_origin +
278 VIRTIODESCSPACE - 1ul;
279 vcpu->arch.sie_block->gmsor = vcpu->kvm->arch.guest_origin;
280 vcpu->arch.sie_block->ecb = 2;
281 vcpu->arch.sie_block->eca = 0xC1002001U;
282 setup_timer(&vcpu->arch.ckc_timer, kvm_s390_idle_wakeup,
283 (unsigned long) vcpu);
284 get_cpu_id(&vcpu->arch.cpu_id);
285 vcpu->arch.cpu_id.version = 0xfe;
286 return 0;
287 }
288
289 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
290 unsigned int id)
291 {
292 struct kvm_vcpu *vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
293 int rc = -ENOMEM;
294
295 if (!vcpu)
296 goto out_nomem;
297
298 vcpu->arch.sie_block = (struct kvm_s390_sie_block *)
299 get_zeroed_page(GFP_KERNEL);
300
301 if (!vcpu->arch.sie_block)
302 goto out_free_cpu;
303
304 vcpu->arch.sie_block->icpua = id;
305 BUG_ON(!kvm->arch.sca);
306 BUG_ON(kvm->arch.sca->cpu[id].sda);
307 kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block;
308 vcpu->arch.sie_block->scaoh = (__u32)(((__u64)kvm->arch.sca) >> 32);
309 vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca;
310
311 spin_lock_init(&vcpu->arch.local_int.lock);
312 INIT_LIST_HEAD(&vcpu->arch.local_int.list);
313 vcpu->arch.local_int.float_int = &kvm->arch.float_int;
314 spin_lock_bh(&kvm->arch.float_int.lock);
315 kvm->arch.float_int.local_int[id] = &vcpu->arch.local_int;
316 init_waitqueue_head(&vcpu->arch.local_int.wq);
317 vcpu->arch.local_int.cpuflags = &vcpu->arch.sie_block->cpuflags;
318 spin_unlock_bh(&kvm->arch.float_int.lock);
319
320 rc = kvm_vcpu_init(vcpu, kvm, id);
321 if (rc)
322 goto out_free_cpu;
323 VM_EVENT(kvm, 3, "create cpu %d at %p, sie block at %p", id, vcpu,
324 vcpu->arch.sie_block);
325
326 return vcpu;
327 out_free_cpu:
328 kfree(vcpu);
329 out_nomem:
330 return ERR_PTR(rc);
331 }
332
333 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
334 {
335 /* kvm common code refers to this, but never calls it */
336 BUG();
337 return 0;
338 }
339
340 static int kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
341 {
342 vcpu_load(vcpu);
343 kvm_s390_vcpu_initial_reset(vcpu);
344 vcpu_put(vcpu);
345 return 0;
346 }
347
348 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
349 {
350 vcpu_load(vcpu);
351 memcpy(&vcpu->arch.guest_gprs, &regs->gprs, sizeof(regs->gprs));
352 vcpu_put(vcpu);
353 return 0;
354 }
355
356 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
357 {
358 vcpu_load(vcpu);
359 memcpy(&regs->gprs, &vcpu->arch.guest_gprs, sizeof(regs->gprs));
360 vcpu_put(vcpu);
361 return 0;
362 }
363
364 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
365 struct kvm_sregs *sregs)
366 {
367 vcpu_load(vcpu);
368 memcpy(&vcpu->arch.guest_acrs, &sregs->acrs, sizeof(sregs->acrs));
369 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
370 vcpu_put(vcpu);
371 return 0;
372 }
373
374 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
375 struct kvm_sregs *sregs)
376 {
377 vcpu_load(vcpu);
378 memcpy(&sregs->acrs, &vcpu->arch.guest_acrs, sizeof(sregs->acrs));
379 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
380 vcpu_put(vcpu);
381 return 0;
382 }
383
384 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
385 {
386 vcpu_load(vcpu);
387 memcpy(&vcpu->arch.guest_fpregs.fprs, &fpu->fprs, sizeof(fpu->fprs));
388 vcpu->arch.guest_fpregs.fpc = fpu->fpc;
389 vcpu_put(vcpu);
390 return 0;
391 }
392
393 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
394 {
395 vcpu_load(vcpu);
396 memcpy(&fpu->fprs, &vcpu->arch.guest_fpregs.fprs, sizeof(fpu->fprs));
397 fpu->fpc = vcpu->arch.guest_fpregs.fpc;
398 vcpu_put(vcpu);
399 return 0;
400 }
401
402 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
403 {
404 int rc = 0;
405
406 vcpu_load(vcpu);
407 if (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_RUNNING)
408 rc = -EBUSY;
409 else
410 vcpu->arch.sie_block->gpsw = psw;
411 vcpu_put(vcpu);
412 return rc;
413 }
414
415 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
416 struct kvm_translation *tr)
417 {
418 return -EINVAL; /* not implemented yet */
419 }
420
421 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
422 struct kvm_debug_guest *dbg)
423 {
424 return -EINVAL; /* not implemented yet */
425 }
426
427 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
428 struct kvm_mp_state *mp_state)
429 {
430 return -EINVAL; /* not implemented yet */
431 }
432
433 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
434 struct kvm_mp_state *mp_state)
435 {
436 return -EINVAL; /* not implemented yet */
437 }
438
439 extern void s390_handle_mcck(void);
440
441 static void __vcpu_run(struct kvm_vcpu *vcpu)
442 {
443 memcpy(&vcpu->arch.sie_block->gg14, &vcpu->arch.guest_gprs[14], 16);
444
445 if (need_resched())
446 schedule();
447
448 if (test_thread_flag(TIF_MCCK_PENDING))
449 s390_handle_mcck();
450
451 kvm_s390_deliver_pending_interrupts(vcpu);
452
453 vcpu->arch.sie_block->icptcode = 0;
454 local_irq_disable();
455 kvm_guest_enter();
456 local_irq_enable();
457 VCPU_EVENT(vcpu, 6, "entering sie flags %x",
458 atomic_read(&vcpu->arch.sie_block->cpuflags));
459 if (sie64a(vcpu->arch.sie_block, vcpu->arch.guest_gprs)) {
460 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
461 kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
462 }
463 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
464 vcpu->arch.sie_block->icptcode);
465 local_irq_disable();
466 kvm_guest_exit();
467 local_irq_enable();
468
469 memcpy(&vcpu->arch.guest_gprs[14], &vcpu->arch.sie_block->gg14, 16);
470 }
471
472 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
473 {
474 int rc;
475 sigset_t sigsaved;
476
477 vcpu_load(vcpu);
478
479 if (vcpu->sigset_active)
480 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
481
482 atomic_set_mask(CPUSTAT_RUNNING, &vcpu->arch.sie_block->cpuflags);
483
484 BUG_ON(vcpu->kvm->arch.float_int.local_int[vcpu->vcpu_id] == NULL);
485
486 switch (kvm_run->exit_reason) {
487 case KVM_EXIT_S390_SIEIC:
488 vcpu->arch.sie_block->gpsw.mask = kvm_run->s390_sieic.mask;
489 vcpu->arch.sie_block->gpsw.addr = kvm_run->s390_sieic.addr;
490 break;
491 case KVM_EXIT_UNKNOWN:
492 case KVM_EXIT_S390_RESET:
493 break;
494 default:
495 BUG();
496 }
497
498 might_sleep();
499
500 do {
501 __vcpu_run(vcpu);
502 rc = kvm_handle_sie_intercept(vcpu);
503 } while (!signal_pending(current) && !rc);
504
505 if (signal_pending(current) && !rc)
506 rc = -EINTR;
507
508 if (rc == -ENOTSUPP) {
509 /* intercept cannot be handled in-kernel, prepare kvm-run */
510 kvm_run->exit_reason = KVM_EXIT_S390_SIEIC;
511 kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
512 kvm_run->s390_sieic.mask = vcpu->arch.sie_block->gpsw.mask;
513 kvm_run->s390_sieic.addr = vcpu->arch.sie_block->gpsw.addr;
514 kvm_run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
515 kvm_run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
516 rc = 0;
517 }
518
519 if (rc == -EREMOTE) {
520 /* intercept was handled, but userspace support is needed
521 * kvm_run has been prepared by the handler */
522 rc = 0;
523 }
524
525 if (vcpu->sigset_active)
526 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
527
528 vcpu_put(vcpu);
529
530 vcpu->stat.exit_userspace++;
531 return rc;
532 }
533
534 static int __guestcopy(struct kvm_vcpu *vcpu, u64 guestdest, const void *from,
535 unsigned long n, int prefix)
536 {
537 if (prefix)
538 return copy_to_guest(vcpu, guestdest, from, n);
539 else
540 return copy_to_guest_absolute(vcpu, guestdest, from, n);
541 }
542
543 /*
544 * store status at address
545 * we use have two special cases:
546 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
547 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
548 */
549 int __kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
550 {
551 const unsigned char archmode = 1;
552 int prefix;
553
554 if (addr == KVM_S390_STORE_STATUS_NOADDR) {
555 if (copy_to_guest_absolute(vcpu, 163ul, &archmode, 1))
556 return -EFAULT;
557 addr = SAVE_AREA_BASE;
558 prefix = 0;
559 } else if (addr == KVM_S390_STORE_STATUS_PREFIXED) {
560 if (copy_to_guest(vcpu, 163ul, &archmode, 1))
561 return -EFAULT;
562 addr = SAVE_AREA_BASE;
563 prefix = 1;
564 } else
565 prefix = 0;
566
567 if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, fp_regs),
568 vcpu->arch.guest_fpregs.fprs, 128, prefix))
569 return -EFAULT;
570
571 if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, gp_regs),
572 vcpu->arch.guest_gprs, 128, prefix))
573 return -EFAULT;
574
575 if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, psw),
576 &vcpu->arch.sie_block->gpsw, 16, prefix))
577 return -EFAULT;
578
579 if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, pref_reg),
580 &vcpu->arch.sie_block->prefix, 4, prefix))
581 return -EFAULT;
582
583 if (__guestcopy(vcpu,
584 addr + offsetof(struct save_area_s390x, fp_ctrl_reg),
585 &vcpu->arch.guest_fpregs.fpc, 4, prefix))
586 return -EFAULT;
587
588 if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, tod_reg),
589 &vcpu->arch.sie_block->todpr, 4, prefix))
590 return -EFAULT;
591
592 if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, timer),
593 &vcpu->arch.sie_block->cputm, 8, prefix))
594 return -EFAULT;
595
596 if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, clk_cmp),
597 &vcpu->arch.sie_block->ckc, 8, prefix))
598 return -EFAULT;
599
600 if (__guestcopy(vcpu, addr + offsetof(struct save_area_s390x, acc_regs),
601 &vcpu->arch.guest_acrs, 64, prefix))
602 return -EFAULT;
603
604 if (__guestcopy(vcpu,
605 addr + offsetof(struct save_area_s390x, ctrl_regs),
606 &vcpu->arch.sie_block->gcr, 128, prefix))
607 return -EFAULT;
608 return 0;
609 }
610
611 static int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
612 {
613 int rc;
614
615 vcpu_load(vcpu);
616 rc = __kvm_s390_vcpu_store_status(vcpu, addr);
617 vcpu_put(vcpu);
618 return rc;
619 }
620
621 long kvm_arch_vcpu_ioctl(struct file *filp,
622 unsigned int ioctl, unsigned long arg)
623 {
624 struct kvm_vcpu *vcpu = filp->private_data;
625 void __user *argp = (void __user *)arg;
626
627 switch (ioctl) {
628 case KVM_S390_INTERRUPT: {
629 struct kvm_s390_interrupt s390int;
630
631 if (copy_from_user(&s390int, argp, sizeof(s390int)))
632 return -EFAULT;
633 return kvm_s390_inject_vcpu(vcpu, &s390int);
634 }
635 case KVM_S390_STORE_STATUS:
636 return kvm_s390_vcpu_store_status(vcpu, arg);
637 case KVM_S390_SET_INITIAL_PSW: {
638 psw_t psw;
639
640 if (copy_from_user(&psw, argp, sizeof(psw)))
641 return -EFAULT;
642 return kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
643 }
644 case KVM_S390_INITIAL_RESET:
645 return kvm_arch_vcpu_ioctl_initial_reset(vcpu);
646 default:
647 ;
648 }
649 return -EINVAL;
650 }
651
652 /* Section: memory related */
653 int kvm_arch_set_memory_region(struct kvm *kvm,
654 struct kvm_userspace_memory_region *mem,
655 struct kvm_memory_slot old,
656 int user_alloc)
657 {
658 /* A few sanity checks. We can have exactly one memory slot which has
659 to start at guest virtual zero and which has to be located at a
660 page boundary in userland and which has to end at a page boundary.
661 The memory in userland is ok to be fragmented into various different
662 vmas. It is okay to mmap() and munmap() stuff in this slot after
663 doing this call at any time */
664
665 if (mem->slot)
666 return -EINVAL;
667
668 if (mem->guest_phys_addr)
669 return -EINVAL;
670
671 if (mem->userspace_addr & (PAGE_SIZE - 1))
672 return -EINVAL;
673
674 if (mem->memory_size & (PAGE_SIZE - 1))
675 return -EINVAL;
676
677 kvm->arch.guest_origin = mem->userspace_addr;
678 kvm->arch.guest_memsize = mem->memory_size;
679
680 /* FIXME: we do want to interrupt running CPUs and update their memory
681 configuration now to avoid race conditions. But hey, changing the
682 memory layout while virtual CPUs are running is usually bad
683 programming practice. */
684
685 return 0;
686 }
687
688 void kvm_arch_flush_shadow(struct kvm *kvm)
689 {
690 }
691
692 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
693 {
694 return gfn;
695 }
696
697 static int __init kvm_s390_init(void)
698 {
699 return kvm_init(NULL, sizeof(struct kvm_vcpu), THIS_MODULE);
700 }
701
702 static void __exit kvm_s390_exit(void)
703 {
704 kvm_exit();
705 }
706
707 module_init(kvm_s390_init);
708 module_exit(kvm_s390_exit);