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KVM: s390: Add clock comparator and CPU timer IRQ injection
[deliverable/linux.git] / arch / s390 / kvm / interrupt.c
1 /*
2 * handling kvm guest interrupts
3 *
4 * Copyright IBM Corp. 2008,2014
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 */
12
13 #include <linux/interrupt.h>
14 #include <linux/kvm_host.h>
15 #include <linux/hrtimer.h>
16 #include <linux/mmu_context.h>
17 #include <linux/signal.h>
18 #include <linux/slab.h>
19 #include <asm/asm-offsets.h>
20 #include <asm/uaccess.h>
21 #include "kvm-s390.h"
22 #include "gaccess.h"
23 #include "trace-s390.h"
24
25 #define IOINT_SCHID_MASK 0x0000ffff
26 #define IOINT_SSID_MASK 0x00030000
27 #define IOINT_CSSID_MASK 0x03fc0000
28 #define IOINT_AI_MASK 0x04000000
29
30 static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu);
31
32 static int is_ioint(u64 type)
33 {
34 return ((type & 0xfffe0000u) != 0xfffe0000u);
35 }
36
37 int psw_extint_disabled(struct kvm_vcpu *vcpu)
38 {
39 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
40 }
41
42 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
43 {
44 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
45 }
46
47 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
48 {
49 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
50 }
51
52 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
53 {
54 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
55 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
56 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
57 return 0;
58 return 1;
59 }
60
61 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
62 {
63 if (psw_extint_disabled(vcpu) ||
64 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
65 return 0;
66 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
67 /* No timer interrupts when single stepping */
68 return 0;
69 return 1;
70 }
71
72 static u64 int_word_to_isc_bits(u32 int_word)
73 {
74 u8 isc = (int_word & 0x38000000) >> 27;
75
76 return (0x80 >> isc) << 24;
77 }
78
79 static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
80 struct kvm_s390_interrupt_info *inti)
81 {
82 switch (inti->type) {
83 case KVM_S390_INT_EXTERNAL_CALL:
84 if (psw_extint_disabled(vcpu))
85 return 0;
86 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
87 return 1;
88 case KVM_S390_INT_EMERGENCY:
89 if (psw_extint_disabled(vcpu))
90 return 0;
91 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
92 return 1;
93 return 0;
94 case KVM_S390_INT_CLOCK_COMP:
95 return ckc_interrupts_enabled(vcpu);
96 case KVM_S390_INT_CPU_TIMER:
97 if (psw_extint_disabled(vcpu))
98 return 0;
99 if (vcpu->arch.sie_block->gcr[0] & 0x400ul)
100 return 1;
101 return 0;
102 case KVM_S390_INT_SERVICE:
103 case KVM_S390_INT_PFAULT_INIT:
104 case KVM_S390_INT_PFAULT_DONE:
105 case KVM_S390_INT_VIRTIO:
106 if (psw_extint_disabled(vcpu))
107 return 0;
108 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
109 return 1;
110 return 0;
111 case KVM_S390_PROGRAM_INT:
112 case KVM_S390_SIGP_STOP:
113 case KVM_S390_SIGP_SET_PREFIX:
114 case KVM_S390_RESTART:
115 return 1;
116 case KVM_S390_MCHK:
117 if (psw_mchk_disabled(vcpu))
118 return 0;
119 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
120 return 1;
121 return 0;
122 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
123 if (psw_ioint_disabled(vcpu))
124 return 0;
125 if (vcpu->arch.sie_block->gcr[6] &
126 int_word_to_isc_bits(inti->io.io_int_word))
127 return 1;
128 return 0;
129 default:
130 printk(KERN_WARNING "illegal interrupt type %llx\n",
131 inti->type);
132 BUG();
133 }
134 return 0;
135 }
136
137 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
138 {
139 atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
140 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
141 }
142
143 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
144 {
145 atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
146 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
147 }
148
149 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
150 {
151 atomic_clear_mask(CPUSTAT_ECALL_PEND |
152 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
153 &vcpu->arch.sie_block->cpuflags);
154 vcpu->arch.sie_block->lctl = 0x0000;
155 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
156
157 if (guestdbg_enabled(vcpu)) {
158 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
159 LCTL_CR10 | LCTL_CR11);
160 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
161 }
162 }
163
164 static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
165 {
166 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
167 }
168
169 static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
170 struct kvm_s390_interrupt_info *inti)
171 {
172 switch (inti->type) {
173 case KVM_S390_INT_EXTERNAL_CALL:
174 case KVM_S390_INT_EMERGENCY:
175 case KVM_S390_INT_SERVICE:
176 case KVM_S390_INT_PFAULT_INIT:
177 case KVM_S390_INT_PFAULT_DONE:
178 case KVM_S390_INT_VIRTIO:
179 case KVM_S390_INT_CLOCK_COMP:
180 case KVM_S390_INT_CPU_TIMER:
181 if (psw_extint_disabled(vcpu))
182 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
183 else
184 vcpu->arch.sie_block->lctl |= LCTL_CR0;
185 break;
186 case KVM_S390_SIGP_STOP:
187 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
188 break;
189 case KVM_S390_MCHK:
190 if (psw_mchk_disabled(vcpu))
191 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
192 else
193 vcpu->arch.sie_block->lctl |= LCTL_CR14;
194 break;
195 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
196 if (psw_ioint_disabled(vcpu))
197 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
198 else
199 vcpu->arch.sie_block->lctl |= LCTL_CR6;
200 break;
201 default:
202 BUG();
203 }
204 }
205
206 static int __deliver_prog_irq(struct kvm_vcpu *vcpu,
207 struct kvm_s390_pgm_info *pgm_info)
208 {
209 const unsigned short table[] = { 2, 4, 4, 6 };
210 int rc = 0;
211
212 switch (pgm_info->code & ~PGM_PER) {
213 case PGM_AFX_TRANSLATION:
214 case PGM_ASX_TRANSLATION:
215 case PGM_EX_TRANSLATION:
216 case PGM_LFX_TRANSLATION:
217 case PGM_LSTE_SEQUENCE:
218 case PGM_LSX_TRANSLATION:
219 case PGM_LX_TRANSLATION:
220 case PGM_PRIMARY_AUTHORITY:
221 case PGM_SECONDARY_AUTHORITY:
222 case PGM_SPACE_SWITCH:
223 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
224 (u64 *)__LC_TRANS_EXC_CODE);
225 break;
226 case PGM_ALEN_TRANSLATION:
227 case PGM_ALE_SEQUENCE:
228 case PGM_ASTE_INSTANCE:
229 case PGM_ASTE_SEQUENCE:
230 case PGM_ASTE_VALIDITY:
231 case PGM_EXTENDED_AUTHORITY:
232 rc = put_guest_lc(vcpu, pgm_info->exc_access_id,
233 (u8 *)__LC_EXC_ACCESS_ID);
234 break;
235 case PGM_ASCE_TYPE:
236 case PGM_PAGE_TRANSLATION:
237 case PGM_REGION_FIRST_TRANS:
238 case PGM_REGION_SECOND_TRANS:
239 case PGM_REGION_THIRD_TRANS:
240 case PGM_SEGMENT_TRANSLATION:
241 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
242 (u64 *)__LC_TRANS_EXC_CODE);
243 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
244 (u8 *)__LC_EXC_ACCESS_ID);
245 rc |= put_guest_lc(vcpu, pgm_info->op_access_id,
246 (u8 *)__LC_OP_ACCESS_ID);
247 break;
248 case PGM_MONITOR:
249 rc = put_guest_lc(vcpu, pgm_info->mon_class_nr,
250 (u64 *)__LC_MON_CLASS_NR);
251 rc |= put_guest_lc(vcpu, pgm_info->mon_code,
252 (u64 *)__LC_MON_CODE);
253 break;
254 case PGM_DATA:
255 rc = put_guest_lc(vcpu, pgm_info->data_exc_code,
256 (u32 *)__LC_DATA_EXC_CODE);
257 break;
258 case PGM_PROTECTION:
259 rc = put_guest_lc(vcpu, pgm_info->trans_exc_code,
260 (u64 *)__LC_TRANS_EXC_CODE);
261 rc |= put_guest_lc(vcpu, pgm_info->exc_access_id,
262 (u8 *)__LC_EXC_ACCESS_ID);
263 break;
264 }
265
266 if (pgm_info->code & PGM_PER) {
267 rc |= put_guest_lc(vcpu, pgm_info->per_code,
268 (u8 *) __LC_PER_CODE);
269 rc |= put_guest_lc(vcpu, pgm_info->per_atmid,
270 (u8 *)__LC_PER_ATMID);
271 rc |= put_guest_lc(vcpu, pgm_info->per_address,
272 (u64 *) __LC_PER_ADDRESS);
273 rc |= put_guest_lc(vcpu, pgm_info->per_access_id,
274 (u8 *) __LC_PER_ACCESS_ID);
275 }
276
277 switch (vcpu->arch.sie_block->icptcode) {
278 case ICPT_INST:
279 case ICPT_INSTPROGI:
280 case ICPT_OPEREXC:
281 case ICPT_PARTEXEC:
282 case ICPT_IOINST:
283 /* last instruction only stored for these icptcodes */
284 rc |= put_guest_lc(vcpu, table[vcpu->arch.sie_block->ipa >> 14],
285 (u16 *) __LC_PGM_ILC);
286 break;
287 case ICPT_PROGI:
288 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->pgmilc,
289 (u16 *) __LC_PGM_ILC);
290 break;
291 default:
292 rc |= put_guest_lc(vcpu, 0,
293 (u16 *) __LC_PGM_ILC);
294 }
295
296 rc |= put_guest_lc(vcpu, pgm_info->code,
297 (u16 *)__LC_PGM_INT_CODE);
298 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
299 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
300 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
301 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
302
303 return rc;
304 }
305
306 static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
307 struct kvm_s390_interrupt_info *inti)
308 {
309 const unsigned short table[] = { 2, 4, 4, 6 };
310 int rc = 0;
311
312 switch (inti->type) {
313 case KVM_S390_INT_EMERGENCY:
314 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
315 vcpu->stat.deliver_emergency_signal++;
316 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
317 inti->emerg.code, 0);
318 rc = put_guest_lc(vcpu, 0x1201, (u16 *)__LC_EXT_INT_CODE);
319 rc |= put_guest_lc(vcpu, inti->emerg.code,
320 (u16 *)__LC_EXT_CPU_ADDR);
321 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
322 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
323 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
324 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
325 break;
326 case KVM_S390_INT_EXTERNAL_CALL:
327 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
328 vcpu->stat.deliver_external_call++;
329 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
330 inti->extcall.code, 0);
331 rc = put_guest_lc(vcpu, 0x1202, (u16 *)__LC_EXT_INT_CODE);
332 rc |= put_guest_lc(vcpu, inti->extcall.code,
333 (u16 *)__LC_EXT_CPU_ADDR);
334 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
335 &vcpu->arch.sie_block->gpsw,
336 sizeof(psw_t));
337 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
338 &vcpu->arch.sie_block->gpsw,
339 sizeof(psw_t));
340 break;
341 case KVM_S390_INT_CLOCK_COMP:
342 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
343 inti->ext.ext_params, 0);
344 deliver_ckc_interrupt(vcpu);
345 break;
346 case KVM_S390_INT_CPU_TIMER:
347 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
348 inti->ext.ext_params, 0);
349 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
350 (u16 *)__LC_EXT_INT_CODE);
351 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
352 &vcpu->arch.sie_block->gpsw,
353 sizeof(psw_t));
354 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
355 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
356 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
357 (u32 *)__LC_EXT_PARAMS);
358 break;
359 case KVM_S390_INT_SERVICE:
360 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
361 inti->ext.ext_params);
362 vcpu->stat.deliver_service_signal++;
363 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
364 inti->ext.ext_params, 0);
365 rc = put_guest_lc(vcpu, 0x2401, (u16 *)__LC_EXT_INT_CODE);
366 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
367 &vcpu->arch.sie_block->gpsw,
368 sizeof(psw_t));
369 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
370 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
371 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
372 (u32 *)__LC_EXT_PARAMS);
373 break;
374 case KVM_S390_INT_PFAULT_INIT:
375 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
376 inti->ext.ext_params2);
377 rc = put_guest_lc(vcpu, 0x2603, (u16 *) __LC_EXT_INT_CODE);
378 rc |= put_guest_lc(vcpu, 0x0600, (u16 *) __LC_EXT_CPU_ADDR);
379 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
380 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
381 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
382 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
383 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
384 (u64 *) __LC_EXT_PARAMS2);
385 break;
386 case KVM_S390_INT_PFAULT_DONE:
387 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type, 0,
388 inti->ext.ext_params2);
389 rc = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
390 rc |= put_guest_lc(vcpu, 0x0680, (u16 *)__LC_EXT_CPU_ADDR);
391 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
392 &vcpu->arch.sie_block->gpsw,
393 sizeof(psw_t));
394 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
395 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
396 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
397 (u64 *)__LC_EXT_PARAMS2);
398 break;
399 case KVM_S390_INT_VIRTIO:
400 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
401 inti->ext.ext_params, inti->ext.ext_params2);
402 vcpu->stat.deliver_virtio_interrupt++;
403 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
404 inti->ext.ext_params,
405 inti->ext.ext_params2);
406 rc = put_guest_lc(vcpu, 0x2603, (u16 *)__LC_EXT_INT_CODE);
407 rc |= put_guest_lc(vcpu, 0x0d00, (u16 *)__LC_EXT_CPU_ADDR);
408 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
409 &vcpu->arch.sie_block->gpsw,
410 sizeof(psw_t));
411 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
412 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
413 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
414 (u32 *)__LC_EXT_PARAMS);
415 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
416 (u64 *)__LC_EXT_PARAMS2);
417 break;
418 case KVM_S390_SIGP_STOP:
419 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
420 vcpu->stat.deliver_stop_signal++;
421 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
422 0, 0);
423 __set_intercept_indicator(vcpu, inti);
424 break;
425
426 case KVM_S390_SIGP_SET_PREFIX:
427 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
428 inti->prefix.address);
429 vcpu->stat.deliver_prefix_signal++;
430 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
431 inti->prefix.address, 0);
432 kvm_s390_set_prefix(vcpu, inti->prefix.address);
433 break;
434
435 case KVM_S390_RESTART:
436 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
437 vcpu->stat.deliver_restart_signal++;
438 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
439 0, 0);
440 rc = write_guest_lc(vcpu,
441 offsetof(struct _lowcore, restart_old_psw),
442 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
443 rc |= read_guest_lc(vcpu, offsetof(struct _lowcore, restart_psw),
444 &vcpu->arch.sie_block->gpsw,
445 sizeof(psw_t));
446 kvm_s390_vcpu_start(vcpu);
447 break;
448 case KVM_S390_PROGRAM_INT:
449 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
450 inti->pgm.code,
451 table[vcpu->arch.sie_block->ipa >> 14]);
452 vcpu->stat.deliver_program_int++;
453 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
454 inti->pgm.code, 0);
455 rc = __deliver_prog_irq(vcpu, &inti->pgm);
456 break;
457
458 case KVM_S390_MCHK:
459 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
460 inti->mchk.mcic);
461 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
462 inti->mchk.cr14,
463 inti->mchk.mcic);
464 rc = kvm_s390_vcpu_store_status(vcpu,
465 KVM_S390_STORE_STATUS_PREFIXED);
466 rc |= put_guest_lc(vcpu, inti->mchk.mcic, (u64 *)__LC_MCCK_CODE);
467 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
468 &vcpu->arch.sie_block->gpsw,
469 sizeof(psw_t));
470 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
471 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
472 break;
473
474 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
475 {
476 __u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
477 inti->io.subchannel_nr;
478 __u64 param1 = ((__u64)inti->io.io_int_parm << 32) |
479 inti->io.io_int_word;
480 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
481 vcpu->stat.deliver_io_int++;
482 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
483 param0, param1);
484 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
485 (u16 *)__LC_SUBCHANNEL_ID);
486 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
487 (u16 *)__LC_SUBCHANNEL_NR);
488 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
489 (u32 *)__LC_IO_INT_PARM);
490 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
491 (u32 *)__LC_IO_INT_WORD);
492 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
493 &vcpu->arch.sie_block->gpsw,
494 sizeof(psw_t));
495 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
496 &vcpu->arch.sie_block->gpsw,
497 sizeof(psw_t));
498 break;
499 }
500 default:
501 BUG();
502 }
503 if (rc) {
504 printk("kvm: The guest lowcore is not mapped during interrupt "
505 "delivery, killing userspace\n");
506 do_exit(SIGKILL);
507 }
508 }
509
510 static void deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
511 {
512 int rc;
513
514 rc = put_guest_lc(vcpu, 0x1004, (u16 __user *)__LC_EXT_INT_CODE);
515 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
516 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
517 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
518 &vcpu->arch.sie_block->gpsw,
519 sizeof(psw_t));
520 if (rc) {
521 printk("kvm: The guest lowcore is not mapped during interrupt "
522 "delivery, killing userspace\n");
523 do_exit(SIGKILL);
524 }
525 }
526
527 int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
528 {
529 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
530 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
531 struct kvm_s390_interrupt_info *inti;
532 int rc = 0;
533
534 if (atomic_read(&li->active)) {
535 spin_lock_bh(&li->lock);
536 list_for_each_entry(inti, &li->list, list)
537 if (__interrupt_is_deliverable(vcpu, inti)) {
538 rc = 1;
539 break;
540 }
541 spin_unlock_bh(&li->lock);
542 }
543
544 if ((!rc) && atomic_read(&fi->active)) {
545 spin_lock(&fi->lock);
546 list_for_each_entry(inti, &fi->list, list)
547 if (__interrupt_is_deliverable(vcpu, inti)) {
548 rc = 1;
549 break;
550 }
551 spin_unlock(&fi->lock);
552 }
553
554 if (!rc && kvm_cpu_has_pending_timer(vcpu))
555 rc = 1;
556
557 return rc;
558 }
559
560 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
561 {
562 if (!(vcpu->arch.sie_block->ckc <
563 get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
564 return 0;
565 if (!ckc_interrupts_enabled(vcpu))
566 return 0;
567 return 1;
568 }
569
570 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
571 {
572 u64 now, sltime;
573 DECLARE_WAITQUEUE(wait, current);
574
575 vcpu->stat.exit_wait_state++;
576 if (kvm_cpu_has_interrupt(vcpu))
577 return 0;
578
579 __set_cpu_idle(vcpu);
580 spin_lock_bh(&vcpu->arch.local_int.lock);
581 vcpu->arch.local_int.timer_due = 0;
582 spin_unlock_bh(&vcpu->arch.local_int.lock);
583
584 if (psw_interrupts_disabled(vcpu)) {
585 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
586 __unset_cpu_idle(vcpu);
587 return -EOPNOTSUPP; /* disabled wait */
588 }
589
590 if (!ckc_interrupts_enabled(vcpu)) {
591 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
592 goto no_timer;
593 }
594
595 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
596 if (vcpu->arch.sie_block->ckc < now) {
597 __unset_cpu_idle(vcpu);
598 return 0;
599 }
600
601 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
602
603 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
604 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
605 no_timer:
606 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
607 spin_lock(&vcpu->arch.local_int.float_int->lock);
608 spin_lock_bh(&vcpu->arch.local_int.lock);
609 add_wait_queue(&vcpu->wq, &wait);
610 while (list_empty(&vcpu->arch.local_int.list) &&
611 list_empty(&vcpu->arch.local_int.float_int->list) &&
612 (!vcpu->arch.local_int.timer_due) &&
613 !signal_pending(current)) {
614 set_current_state(TASK_INTERRUPTIBLE);
615 spin_unlock_bh(&vcpu->arch.local_int.lock);
616 spin_unlock(&vcpu->arch.local_int.float_int->lock);
617 schedule();
618 spin_lock(&vcpu->arch.local_int.float_int->lock);
619 spin_lock_bh(&vcpu->arch.local_int.lock);
620 }
621 __unset_cpu_idle(vcpu);
622 __set_current_state(TASK_RUNNING);
623 remove_wait_queue(&vcpu->wq, &wait);
624 spin_unlock_bh(&vcpu->arch.local_int.lock);
625 spin_unlock(&vcpu->arch.local_int.float_int->lock);
626 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
627
628 hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
629 return 0;
630 }
631
632 void kvm_s390_tasklet(unsigned long parm)
633 {
634 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
635
636 spin_lock(&vcpu->arch.local_int.lock);
637 vcpu->arch.local_int.timer_due = 1;
638 if (waitqueue_active(&vcpu->wq))
639 wake_up_interruptible(&vcpu->wq);
640 spin_unlock(&vcpu->arch.local_int.lock);
641 }
642
643 /*
644 * low level hrtimer wake routine. Because this runs in hardirq context
645 * we schedule a tasklet to do the real work.
646 */
647 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
648 {
649 struct kvm_vcpu *vcpu;
650
651 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
652 vcpu->preempted = true;
653 tasklet_schedule(&vcpu->arch.tasklet);
654
655 return HRTIMER_NORESTART;
656 }
657
658 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
659 {
660 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
661 struct kvm_s390_interrupt_info *n, *inti = NULL;
662
663 spin_lock_bh(&li->lock);
664 list_for_each_entry_safe(inti, n, &li->list, list) {
665 list_del(&inti->list);
666 kfree(inti);
667 }
668 atomic_set(&li->active, 0);
669 spin_unlock_bh(&li->lock);
670 }
671
672 void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
673 {
674 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
675 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
676 struct kvm_s390_interrupt_info *n, *inti = NULL;
677 int deliver;
678
679 __reset_intercept_indicators(vcpu);
680 if (atomic_read(&li->active)) {
681 do {
682 deliver = 0;
683 spin_lock_bh(&li->lock);
684 list_for_each_entry_safe(inti, n, &li->list, list) {
685 if (__interrupt_is_deliverable(vcpu, inti)) {
686 list_del(&inti->list);
687 deliver = 1;
688 break;
689 }
690 __set_intercept_indicator(vcpu, inti);
691 }
692 if (list_empty(&li->list))
693 atomic_set(&li->active, 0);
694 spin_unlock_bh(&li->lock);
695 if (deliver) {
696 __do_deliver_interrupt(vcpu, inti);
697 kfree(inti);
698 }
699 } while (deliver);
700 }
701
702 if (kvm_cpu_has_pending_timer(vcpu))
703 deliver_ckc_interrupt(vcpu);
704
705 if (atomic_read(&fi->active)) {
706 do {
707 deliver = 0;
708 spin_lock(&fi->lock);
709 list_for_each_entry_safe(inti, n, &fi->list, list) {
710 if (__interrupt_is_deliverable(vcpu, inti)) {
711 list_del(&inti->list);
712 fi->irq_count--;
713 deliver = 1;
714 break;
715 }
716 __set_intercept_indicator(vcpu, inti);
717 }
718 if (list_empty(&fi->list))
719 atomic_set(&fi->active, 0);
720 spin_unlock(&fi->lock);
721 if (deliver) {
722 __do_deliver_interrupt(vcpu, inti);
723 kfree(inti);
724 }
725 } while (deliver);
726 }
727 }
728
729 void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
730 {
731 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
732 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
733 struct kvm_s390_interrupt_info *n, *inti = NULL;
734 int deliver;
735
736 __reset_intercept_indicators(vcpu);
737 if (atomic_read(&li->active)) {
738 do {
739 deliver = 0;
740 spin_lock_bh(&li->lock);
741 list_for_each_entry_safe(inti, n, &li->list, list) {
742 if ((inti->type == KVM_S390_MCHK) &&
743 __interrupt_is_deliverable(vcpu, inti)) {
744 list_del(&inti->list);
745 deliver = 1;
746 break;
747 }
748 __set_intercept_indicator(vcpu, inti);
749 }
750 if (list_empty(&li->list))
751 atomic_set(&li->active, 0);
752 spin_unlock_bh(&li->lock);
753 if (deliver) {
754 __do_deliver_interrupt(vcpu, inti);
755 kfree(inti);
756 }
757 } while (deliver);
758 }
759
760 if (atomic_read(&fi->active)) {
761 do {
762 deliver = 0;
763 spin_lock(&fi->lock);
764 list_for_each_entry_safe(inti, n, &fi->list, list) {
765 if ((inti->type == KVM_S390_MCHK) &&
766 __interrupt_is_deliverable(vcpu, inti)) {
767 list_del(&inti->list);
768 fi->irq_count--;
769 deliver = 1;
770 break;
771 }
772 __set_intercept_indicator(vcpu, inti);
773 }
774 if (list_empty(&fi->list))
775 atomic_set(&fi->active, 0);
776 spin_unlock(&fi->lock);
777 if (deliver) {
778 __do_deliver_interrupt(vcpu, inti);
779 kfree(inti);
780 }
781 } while (deliver);
782 }
783 }
784
785 int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
786 {
787 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
788 struct kvm_s390_interrupt_info *inti;
789
790 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
791 if (!inti)
792 return -ENOMEM;
793
794 inti->type = KVM_S390_PROGRAM_INT;
795 inti->pgm.code = code;
796
797 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
798 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
799 spin_lock_bh(&li->lock);
800 list_add(&inti->list, &li->list);
801 atomic_set(&li->active, 1);
802 BUG_ON(waitqueue_active(li->wq));
803 spin_unlock_bh(&li->lock);
804 return 0;
805 }
806
807 int kvm_s390_inject_prog_irq(struct kvm_vcpu *vcpu,
808 struct kvm_s390_pgm_info *pgm_info)
809 {
810 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
811 struct kvm_s390_interrupt_info *inti;
812
813 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
814 if (!inti)
815 return -ENOMEM;
816
817 VCPU_EVENT(vcpu, 3, "inject: prog irq %d (from kernel)",
818 pgm_info->code);
819 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
820 pgm_info->code, 0, 1);
821
822 inti->type = KVM_S390_PROGRAM_INT;
823 memcpy(&inti->pgm, pgm_info, sizeof(inti->pgm));
824 spin_lock_bh(&li->lock);
825 list_add(&inti->list, &li->list);
826 atomic_set(&li->active, 1);
827 BUG_ON(waitqueue_active(li->wq));
828 spin_unlock_bh(&li->lock);
829 return 0;
830 }
831
832 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
833 u64 cr6, u64 schid)
834 {
835 struct kvm_s390_float_interrupt *fi;
836 struct kvm_s390_interrupt_info *inti, *iter;
837
838 if ((!schid && !cr6) || (schid && cr6))
839 return NULL;
840 mutex_lock(&kvm->lock);
841 fi = &kvm->arch.float_int;
842 spin_lock(&fi->lock);
843 inti = NULL;
844 list_for_each_entry(iter, &fi->list, list) {
845 if (!is_ioint(iter->type))
846 continue;
847 if (cr6 &&
848 ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
849 continue;
850 if (schid) {
851 if (((schid & 0x00000000ffff0000) >> 16) !=
852 iter->io.subchannel_id)
853 continue;
854 if ((schid & 0x000000000000ffff) !=
855 iter->io.subchannel_nr)
856 continue;
857 }
858 inti = iter;
859 break;
860 }
861 if (inti) {
862 list_del_init(&inti->list);
863 fi->irq_count--;
864 }
865 if (list_empty(&fi->list))
866 atomic_set(&fi->active, 0);
867 spin_unlock(&fi->lock);
868 mutex_unlock(&kvm->lock);
869 return inti;
870 }
871
872 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
873 {
874 struct kvm_s390_local_interrupt *li;
875 struct kvm_s390_float_interrupt *fi;
876 struct kvm_s390_interrupt_info *iter;
877 struct kvm_vcpu *dst_vcpu = NULL;
878 int sigcpu;
879 int rc = 0;
880
881 mutex_lock(&kvm->lock);
882 fi = &kvm->arch.float_int;
883 spin_lock(&fi->lock);
884 if (fi->irq_count >= KVM_S390_MAX_FLOAT_IRQS) {
885 rc = -EINVAL;
886 goto unlock_fi;
887 }
888 fi->irq_count++;
889 if (!is_ioint(inti->type)) {
890 list_add_tail(&inti->list, &fi->list);
891 } else {
892 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
893
894 /* Keep I/O interrupts sorted in isc order. */
895 list_for_each_entry(iter, &fi->list, list) {
896 if (!is_ioint(iter->type))
897 continue;
898 if (int_word_to_isc_bits(iter->io.io_int_word)
899 <= isc_bits)
900 continue;
901 break;
902 }
903 list_add_tail(&inti->list, &iter->list);
904 }
905 atomic_set(&fi->active, 1);
906 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
907 if (sigcpu == KVM_MAX_VCPUS) {
908 do {
909 sigcpu = fi->next_rr_cpu++;
910 if (sigcpu == KVM_MAX_VCPUS)
911 sigcpu = fi->next_rr_cpu = 0;
912 } while (kvm_get_vcpu(kvm, sigcpu) == NULL);
913 }
914 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
915 li = &dst_vcpu->arch.local_int;
916 spin_lock_bh(&li->lock);
917 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
918 if (waitqueue_active(li->wq))
919 wake_up_interruptible(li->wq);
920 kvm_get_vcpu(kvm, sigcpu)->preempted = true;
921 spin_unlock_bh(&li->lock);
922 unlock_fi:
923 spin_unlock(&fi->lock);
924 mutex_unlock(&kvm->lock);
925 return rc;
926 }
927
928 int kvm_s390_inject_vm(struct kvm *kvm,
929 struct kvm_s390_interrupt *s390int)
930 {
931 struct kvm_s390_interrupt_info *inti;
932
933 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
934 if (!inti)
935 return -ENOMEM;
936
937 inti->type = s390int->type;
938 switch (inti->type) {
939 case KVM_S390_INT_VIRTIO:
940 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
941 s390int->parm, s390int->parm64);
942 inti->ext.ext_params = s390int->parm;
943 inti->ext.ext_params2 = s390int->parm64;
944 break;
945 case KVM_S390_INT_SERVICE:
946 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
947 inti->ext.ext_params = s390int->parm;
948 break;
949 case KVM_S390_INT_PFAULT_DONE:
950 inti->type = s390int->type;
951 inti->ext.ext_params2 = s390int->parm64;
952 break;
953 case KVM_S390_MCHK:
954 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
955 s390int->parm64);
956 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
957 inti->mchk.mcic = s390int->parm64;
958 break;
959 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
960 if (inti->type & IOINT_AI_MASK)
961 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
962 else
963 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
964 s390int->type & IOINT_CSSID_MASK,
965 s390int->type & IOINT_SSID_MASK,
966 s390int->type & IOINT_SCHID_MASK);
967 inti->io.subchannel_id = s390int->parm >> 16;
968 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
969 inti->io.io_int_parm = s390int->parm64 >> 32;
970 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
971 break;
972 default:
973 kfree(inti);
974 return -EINVAL;
975 }
976 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
977 2);
978
979 return __inject_vm(kvm, inti);
980 }
981
982 void kvm_s390_reinject_io_int(struct kvm *kvm,
983 struct kvm_s390_interrupt_info *inti)
984 {
985 __inject_vm(kvm, inti);
986 }
987
988 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
989 struct kvm_s390_interrupt *s390int)
990 {
991 struct kvm_s390_local_interrupt *li;
992 struct kvm_s390_interrupt_info *inti;
993
994 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
995 if (!inti)
996 return -ENOMEM;
997
998 switch (s390int->type) {
999 case KVM_S390_PROGRAM_INT:
1000 if (s390int->parm & 0xffff0000) {
1001 kfree(inti);
1002 return -EINVAL;
1003 }
1004 inti->type = s390int->type;
1005 inti->pgm.code = s390int->parm;
1006 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
1007 s390int->parm);
1008 break;
1009 case KVM_S390_SIGP_SET_PREFIX:
1010 inti->prefix.address = s390int->parm;
1011 inti->type = s390int->type;
1012 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
1013 s390int->parm);
1014 break;
1015 case KVM_S390_SIGP_STOP:
1016 case KVM_S390_RESTART:
1017 case KVM_S390_INT_CLOCK_COMP:
1018 case KVM_S390_INT_CPU_TIMER:
1019 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
1020 inti->type = s390int->type;
1021 break;
1022 case KVM_S390_INT_EXTERNAL_CALL:
1023 if (s390int->parm & 0xffff0000) {
1024 kfree(inti);
1025 return -EINVAL;
1026 }
1027 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
1028 s390int->parm);
1029 inti->type = s390int->type;
1030 inti->extcall.code = s390int->parm;
1031 break;
1032 case KVM_S390_INT_EMERGENCY:
1033 if (s390int->parm & 0xffff0000) {
1034 kfree(inti);
1035 return -EINVAL;
1036 }
1037 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
1038 inti->type = s390int->type;
1039 inti->emerg.code = s390int->parm;
1040 break;
1041 case KVM_S390_MCHK:
1042 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
1043 s390int->parm64);
1044 inti->type = s390int->type;
1045 inti->mchk.mcic = s390int->parm64;
1046 break;
1047 case KVM_S390_INT_PFAULT_INIT:
1048 inti->type = s390int->type;
1049 inti->ext.ext_params2 = s390int->parm64;
1050 break;
1051 case KVM_S390_INT_VIRTIO:
1052 case KVM_S390_INT_SERVICE:
1053 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1054 default:
1055 kfree(inti);
1056 return -EINVAL;
1057 }
1058 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
1059 s390int->parm64, 2);
1060
1061 mutex_lock(&vcpu->kvm->lock);
1062 li = &vcpu->arch.local_int;
1063 spin_lock_bh(&li->lock);
1064 if (inti->type == KVM_S390_PROGRAM_INT)
1065 list_add(&inti->list, &li->list);
1066 else
1067 list_add_tail(&inti->list, &li->list);
1068 atomic_set(&li->active, 1);
1069 if (inti->type == KVM_S390_SIGP_STOP)
1070 li->action_bits |= ACTION_STOP_ON_STOP;
1071 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
1072 if (waitqueue_active(&vcpu->wq))
1073 wake_up_interruptible(&vcpu->wq);
1074 vcpu->preempted = true;
1075 spin_unlock_bh(&li->lock);
1076 mutex_unlock(&vcpu->kvm->lock);
1077 return 0;
1078 }
1079
1080 void kvm_s390_clear_float_irqs(struct kvm *kvm)
1081 {
1082 struct kvm_s390_float_interrupt *fi;
1083 struct kvm_s390_interrupt_info *n, *inti = NULL;
1084
1085 mutex_lock(&kvm->lock);
1086 fi = &kvm->arch.float_int;
1087 spin_lock(&fi->lock);
1088 list_for_each_entry_safe(inti, n, &fi->list, list) {
1089 list_del(&inti->list);
1090 kfree(inti);
1091 }
1092 fi->irq_count = 0;
1093 atomic_set(&fi->active, 0);
1094 spin_unlock(&fi->lock);
1095 mutex_unlock(&kvm->lock);
1096 }
1097
1098 static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
1099 u8 *addr)
1100 {
1101 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1102 struct kvm_s390_irq irq = {0};
1103
1104 irq.type = inti->type;
1105 switch (inti->type) {
1106 case KVM_S390_INT_PFAULT_INIT:
1107 case KVM_S390_INT_PFAULT_DONE:
1108 case KVM_S390_INT_VIRTIO:
1109 case KVM_S390_INT_SERVICE:
1110 irq.u.ext = inti->ext;
1111 break;
1112 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1113 irq.u.io = inti->io;
1114 break;
1115 case KVM_S390_MCHK:
1116 irq.u.mchk = inti->mchk;
1117 break;
1118 default:
1119 return -EINVAL;
1120 }
1121
1122 if (copy_to_user(uptr, &irq, sizeof(irq)))
1123 return -EFAULT;
1124
1125 return 0;
1126 }
1127
1128 static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
1129 {
1130 struct kvm_s390_interrupt_info *inti;
1131 struct kvm_s390_float_interrupt *fi;
1132 int ret = 0;
1133 int n = 0;
1134
1135 mutex_lock(&kvm->lock);
1136 fi = &kvm->arch.float_int;
1137 spin_lock(&fi->lock);
1138
1139 list_for_each_entry(inti, &fi->list, list) {
1140 if (len < sizeof(struct kvm_s390_irq)) {
1141 /* signal userspace to try again */
1142 ret = -ENOMEM;
1143 break;
1144 }
1145 ret = copy_irq_to_user(inti, buf);
1146 if (ret)
1147 break;
1148 buf += sizeof(struct kvm_s390_irq);
1149 len -= sizeof(struct kvm_s390_irq);
1150 n++;
1151 }
1152
1153 spin_unlock(&fi->lock);
1154 mutex_unlock(&kvm->lock);
1155
1156 return ret < 0 ? ret : n;
1157 }
1158
1159 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1160 {
1161 int r;
1162
1163 switch (attr->group) {
1164 case KVM_DEV_FLIC_GET_ALL_IRQS:
1165 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
1166 attr->attr);
1167 break;
1168 default:
1169 r = -EINVAL;
1170 }
1171
1172 return r;
1173 }
1174
1175 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1176 u64 addr)
1177 {
1178 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1179 void *target = NULL;
1180 void __user *source;
1181 u64 size;
1182
1183 if (get_user(inti->type, (u64 __user *)addr))
1184 return -EFAULT;
1185
1186 switch (inti->type) {
1187 case KVM_S390_INT_PFAULT_INIT:
1188 case KVM_S390_INT_PFAULT_DONE:
1189 case KVM_S390_INT_VIRTIO:
1190 case KVM_S390_INT_SERVICE:
1191 target = (void *) &inti->ext;
1192 source = &uptr->u.ext;
1193 size = sizeof(inti->ext);
1194 break;
1195 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1196 target = (void *) &inti->io;
1197 source = &uptr->u.io;
1198 size = sizeof(inti->io);
1199 break;
1200 case KVM_S390_MCHK:
1201 target = (void *) &inti->mchk;
1202 source = &uptr->u.mchk;
1203 size = sizeof(inti->mchk);
1204 break;
1205 default:
1206 return -EINVAL;
1207 }
1208
1209 if (copy_from_user(target, source, size))
1210 return -EFAULT;
1211
1212 return 0;
1213 }
1214
1215 static int enqueue_floating_irq(struct kvm_device *dev,
1216 struct kvm_device_attr *attr)
1217 {
1218 struct kvm_s390_interrupt_info *inti = NULL;
1219 int r = 0;
1220 int len = attr->attr;
1221
1222 if (len % sizeof(struct kvm_s390_irq) != 0)
1223 return -EINVAL;
1224 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1225 return -EINVAL;
1226
1227 while (len >= sizeof(struct kvm_s390_irq)) {
1228 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1229 if (!inti)
1230 return -ENOMEM;
1231
1232 r = copy_irq_from_user(inti, attr->addr);
1233 if (r) {
1234 kfree(inti);
1235 return r;
1236 }
1237 r = __inject_vm(dev->kvm, inti);
1238 if (r) {
1239 kfree(inti);
1240 return r;
1241 }
1242 len -= sizeof(struct kvm_s390_irq);
1243 attr->addr += sizeof(struct kvm_s390_irq);
1244 }
1245
1246 return r;
1247 }
1248
1249 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1250 {
1251 if (id >= MAX_S390_IO_ADAPTERS)
1252 return NULL;
1253 return kvm->arch.adapters[id];
1254 }
1255
1256 static int register_io_adapter(struct kvm_device *dev,
1257 struct kvm_device_attr *attr)
1258 {
1259 struct s390_io_adapter *adapter;
1260 struct kvm_s390_io_adapter adapter_info;
1261
1262 if (copy_from_user(&adapter_info,
1263 (void __user *)attr->addr, sizeof(adapter_info)))
1264 return -EFAULT;
1265
1266 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1267 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1268 return -EINVAL;
1269
1270 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1271 if (!adapter)
1272 return -ENOMEM;
1273
1274 INIT_LIST_HEAD(&adapter->maps);
1275 init_rwsem(&adapter->maps_lock);
1276 atomic_set(&adapter->nr_maps, 0);
1277 adapter->id = adapter_info.id;
1278 adapter->isc = adapter_info.isc;
1279 adapter->maskable = adapter_info.maskable;
1280 adapter->masked = false;
1281 adapter->swap = adapter_info.swap;
1282 dev->kvm->arch.adapters[adapter->id] = adapter;
1283
1284 return 0;
1285 }
1286
1287 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1288 {
1289 int ret;
1290 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1291
1292 if (!adapter || !adapter->maskable)
1293 return -EINVAL;
1294 ret = adapter->masked;
1295 adapter->masked = masked;
1296 return ret;
1297 }
1298
1299 static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1300 {
1301 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1302 struct s390_map_info *map;
1303 int ret;
1304
1305 if (!adapter || !addr)
1306 return -EINVAL;
1307
1308 map = kzalloc(sizeof(*map), GFP_KERNEL);
1309 if (!map) {
1310 ret = -ENOMEM;
1311 goto out;
1312 }
1313 INIT_LIST_HEAD(&map->list);
1314 map->guest_addr = addr;
1315 map->addr = gmap_translate(addr, kvm->arch.gmap);
1316 if (map->addr == -EFAULT) {
1317 ret = -EFAULT;
1318 goto out;
1319 }
1320 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1321 if (ret < 0)
1322 goto out;
1323 BUG_ON(ret != 1);
1324 down_write(&adapter->maps_lock);
1325 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1326 list_add_tail(&map->list, &adapter->maps);
1327 ret = 0;
1328 } else {
1329 put_page(map->page);
1330 ret = -EINVAL;
1331 }
1332 up_write(&adapter->maps_lock);
1333 out:
1334 if (ret)
1335 kfree(map);
1336 return ret;
1337 }
1338
1339 static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1340 {
1341 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1342 struct s390_map_info *map, *tmp;
1343 int found = 0;
1344
1345 if (!adapter || !addr)
1346 return -EINVAL;
1347
1348 down_write(&adapter->maps_lock);
1349 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1350 if (map->guest_addr == addr) {
1351 found = 1;
1352 atomic_dec(&adapter->nr_maps);
1353 list_del(&map->list);
1354 put_page(map->page);
1355 kfree(map);
1356 break;
1357 }
1358 }
1359 up_write(&adapter->maps_lock);
1360
1361 return found ? 0 : -EINVAL;
1362 }
1363
1364 void kvm_s390_destroy_adapters(struct kvm *kvm)
1365 {
1366 int i;
1367 struct s390_map_info *map, *tmp;
1368
1369 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
1370 if (!kvm->arch.adapters[i])
1371 continue;
1372 list_for_each_entry_safe(map, tmp,
1373 &kvm->arch.adapters[i]->maps, list) {
1374 list_del(&map->list);
1375 put_page(map->page);
1376 kfree(map);
1377 }
1378 kfree(kvm->arch.adapters[i]);
1379 }
1380 }
1381
1382 static int modify_io_adapter(struct kvm_device *dev,
1383 struct kvm_device_attr *attr)
1384 {
1385 struct kvm_s390_io_adapter_req req;
1386 struct s390_io_adapter *adapter;
1387 int ret;
1388
1389 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
1390 return -EFAULT;
1391
1392 adapter = get_io_adapter(dev->kvm, req.id);
1393 if (!adapter)
1394 return -EINVAL;
1395 switch (req.type) {
1396 case KVM_S390_IO_ADAPTER_MASK:
1397 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
1398 if (ret > 0)
1399 ret = 0;
1400 break;
1401 case KVM_S390_IO_ADAPTER_MAP:
1402 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
1403 break;
1404 case KVM_S390_IO_ADAPTER_UNMAP:
1405 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
1406 break;
1407 default:
1408 ret = -EINVAL;
1409 }
1410
1411 return ret;
1412 }
1413
1414 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1415 {
1416 int r = 0;
1417 unsigned int i;
1418 struct kvm_vcpu *vcpu;
1419
1420 switch (attr->group) {
1421 case KVM_DEV_FLIC_ENQUEUE:
1422 r = enqueue_floating_irq(dev, attr);
1423 break;
1424 case KVM_DEV_FLIC_CLEAR_IRQS:
1425 r = 0;
1426 kvm_s390_clear_float_irqs(dev->kvm);
1427 break;
1428 case KVM_DEV_FLIC_APF_ENABLE:
1429 dev->kvm->arch.gmap->pfault_enabled = 1;
1430 break;
1431 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
1432 dev->kvm->arch.gmap->pfault_enabled = 0;
1433 /*
1434 * Make sure no async faults are in transition when
1435 * clearing the queues. So we don't need to worry
1436 * about late coming workers.
1437 */
1438 synchronize_srcu(&dev->kvm->srcu);
1439 kvm_for_each_vcpu(i, vcpu, dev->kvm)
1440 kvm_clear_async_pf_completion_queue(vcpu);
1441 break;
1442 case KVM_DEV_FLIC_ADAPTER_REGISTER:
1443 r = register_io_adapter(dev, attr);
1444 break;
1445 case KVM_DEV_FLIC_ADAPTER_MODIFY:
1446 r = modify_io_adapter(dev, attr);
1447 break;
1448 default:
1449 r = -EINVAL;
1450 }
1451
1452 return r;
1453 }
1454
1455 static int flic_create(struct kvm_device *dev, u32 type)
1456 {
1457 if (!dev)
1458 return -EINVAL;
1459 if (dev->kvm->arch.flic)
1460 return -EINVAL;
1461 dev->kvm->arch.flic = dev;
1462 return 0;
1463 }
1464
1465 static void flic_destroy(struct kvm_device *dev)
1466 {
1467 dev->kvm->arch.flic = NULL;
1468 kfree(dev);
1469 }
1470
1471 /* s390 floating irq controller (flic) */
1472 struct kvm_device_ops kvm_flic_ops = {
1473 .name = "kvm-flic",
1474 .get_attr = flic_get_attr,
1475 .set_attr = flic_set_attr,
1476 .create = flic_create,
1477 .destroy = flic_destroy,
1478 };
1479
1480 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
1481 {
1482 unsigned long bit;
1483
1484 bit = bit_nr + (addr % PAGE_SIZE) * 8;
1485
1486 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
1487 }
1488
1489 static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
1490 u64 addr)
1491 {
1492 struct s390_map_info *map;
1493
1494 if (!adapter)
1495 return NULL;
1496
1497 list_for_each_entry(map, &adapter->maps, list) {
1498 if (map->guest_addr == addr)
1499 return map;
1500 }
1501 return NULL;
1502 }
1503
1504 static int adapter_indicators_set(struct kvm *kvm,
1505 struct s390_io_adapter *adapter,
1506 struct kvm_s390_adapter_int *adapter_int)
1507 {
1508 unsigned long bit;
1509 int summary_set, idx;
1510 struct s390_map_info *info;
1511 void *map;
1512
1513 info = get_map_info(adapter, adapter_int->ind_addr);
1514 if (!info)
1515 return -1;
1516 map = page_address(info->page);
1517 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
1518 set_bit(bit, map);
1519 idx = srcu_read_lock(&kvm->srcu);
1520 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1521 set_page_dirty_lock(info->page);
1522 info = get_map_info(adapter, adapter_int->summary_addr);
1523 if (!info) {
1524 srcu_read_unlock(&kvm->srcu, idx);
1525 return -1;
1526 }
1527 map = page_address(info->page);
1528 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
1529 adapter->swap);
1530 summary_set = test_and_set_bit(bit, map);
1531 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
1532 set_page_dirty_lock(info->page);
1533 srcu_read_unlock(&kvm->srcu, idx);
1534 return summary_set ? 0 : 1;
1535 }
1536
1537 /*
1538 * < 0 - not injected due to error
1539 * = 0 - coalesced, summary indicator already active
1540 * > 0 - injected interrupt
1541 */
1542 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
1543 struct kvm *kvm, int irq_source_id, int level,
1544 bool line_status)
1545 {
1546 int ret;
1547 struct s390_io_adapter *adapter;
1548
1549 /* We're only interested in the 0->1 transition. */
1550 if (!level)
1551 return 0;
1552 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
1553 if (!adapter)
1554 return -1;
1555 down_read(&adapter->maps_lock);
1556 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
1557 up_read(&adapter->maps_lock);
1558 if ((ret > 0) && !adapter->masked) {
1559 struct kvm_s390_interrupt s390int = {
1560 .type = KVM_S390_INT_IO(1, 0, 0, 0),
1561 .parm = 0,
1562 .parm64 = (adapter->isc << 27) | 0x80000000,
1563 };
1564 ret = kvm_s390_inject_vm(kvm, &s390int);
1565 if (ret == 0)
1566 ret = 1;
1567 }
1568 return ret;
1569 }
1570
1571 int kvm_set_routing_entry(struct kvm_irq_routing_table *rt,
1572 struct kvm_kernel_irq_routing_entry *e,
1573 const struct kvm_irq_routing_entry *ue)
1574 {
1575 int ret;
1576
1577 switch (ue->type) {
1578 case KVM_IRQ_ROUTING_S390_ADAPTER:
1579 e->set = set_adapter_int;
1580 e->adapter.summary_addr = ue->u.adapter.summary_addr;
1581 e->adapter.ind_addr = ue->u.adapter.ind_addr;
1582 e->adapter.summary_offset = ue->u.adapter.summary_offset;
1583 e->adapter.ind_offset = ue->u.adapter.ind_offset;
1584 e->adapter.adapter_id = ue->u.adapter.adapter_id;
1585 ret = 0;
1586 break;
1587 default:
1588 ret = -EINVAL;
1589 }
1590
1591 return ret;
1592 }
1593
1594 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
1595 int irq_source_id, int level, bool line_status)
1596 {
1597 return -EINVAL;
1598 }
Linux kernel - Deliverables
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