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KVM: s390: add floating irq controller
[mirror_ubuntu-artful-kernel.git] / arch / s390 / kvm / interrupt.c
CommitLineData
ba5c1e9b 1/*
a53c8fab 2 * handling kvm guest interrupts
ba5c1e9b
CO		 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 */
12
ca872302 13#include <linux/interrupt.h>
ba5c1e9b 14#include <linux/kvm_host.h>
cbb870c8 15#include <linux/hrtimer.h>
3cd61299 16#include <linux/signal.h>
5a0e3ad6 17#include <linux/slab.h>
cbb870c8
HC		 18#include <asm/asm-offsets.h>
19#include <asm/uaccess.h>
ba5c1e9b
CO		 20#include "kvm-s390.h"
21#include "gaccess.h"
ade38c31 22#include "trace-s390.h"
ba5c1e9b 23
d8346b7d
CH		 24#define IOINT_SCHID_MASK 0x0000ffff
25#define IOINT_SSID_MASK 0x00030000
26#define IOINT_CSSID_MASK 0x03fc0000
27#define IOINT_AI_MASK 0x04000000
28
29static int is_ioint(u64 type)
30{
31 return ((type & 0xfffe0000u) != 0xfffe0000u);
32}
33
ba5c1e9b
CO		 34static int psw_extint_disabled(struct kvm_vcpu *vcpu)
35{
36 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
37}
38
d8346b7d
CH		 39static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
40{
41 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
42}
43
48a3e950
CH		 44static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
45{
46 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
47}
48
ba5c1e9b
CO		 49static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
50{
51 if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
52 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO) ||
53 (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT))
54 return 0;
55 return 1;
56}
57
79fd50c6
CH		 58static u64 int_word_to_isc_bits(u32 int_word)
59{
60 u8 isc = (int_word & 0x38000000) >> 27;
61
62 return (0x80 >> isc) << 24;
63}
64
ba5c1e9b 65static int __interrupt_is_deliverable(struct kvm_vcpu *vcpu,
180c12fb 66 struct kvm_s390_interrupt_info *inti)
ba5c1e9b
CO		 67{
68 switch (inti->type) {
7697e71f
CE		 69 case KVM_S390_INT_EXTERNAL_CALL:
70 if (psw_extint_disabled(vcpu))
71 return 0;
72 if (vcpu->arch.sie_block->gcr[0] & 0x2000ul)
73 return 1;
ba5c1e9b
CO		 74 case KVM_S390_INT_EMERGENCY:
75 if (psw_extint_disabled(vcpu))
76 return 0;
77 if (vcpu->arch.sie_block->gcr[0] & 0x4000ul)
78 return 1;
79 return 0;
80 case KVM_S390_INT_SERVICE:
81 if (psw_extint_disabled(vcpu))
82 return 0;
83 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
84 return 1;
85 return 0;
86 case KVM_S390_INT_VIRTIO:
87 if (psw_extint_disabled(vcpu))
88 return 0;
89 if (vcpu->arch.sie_block->gcr[0] & 0x200ul)
90 return 1;
91 return 0;
92 case KVM_S390_PROGRAM_INT:
93 case KVM_S390_SIGP_STOP:
94 case KVM_S390_SIGP_SET_PREFIX:
95 case KVM_S390_RESTART:
96 return 1;
48a3e950
CH		 97 case KVM_S390_MCHK:
98 if (psw_mchk_disabled(vcpu))
99 return 0;
100 if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
101 return 1;
102 return 0;
d8346b7d
CH		 103 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
104 if (psw_ioint_disabled(vcpu))
105 return 0;
79fd50c6
CH		 106 if (vcpu->arch.sie_block->gcr[6] &
107 int_word_to_isc_bits(inti->io.io_int_word))
d8346b7d
CH		 108 return 1;
109 return 0;
ba5c1e9b 110 default:
d8346b7d
CH		 111 printk(KERN_WARNING "illegal interrupt type %llx\n",
112 inti->type);
ba5c1e9b
CO		 113 BUG();
114 }
115 return 0;
116}
117
118static void __set_cpu_idle(struct kvm_vcpu *vcpu)
119{
120 BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
121 atomic_set_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
122 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
123}
124
125static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
126{
127 BUG_ON(vcpu->vcpu_id > KVM_MAX_VCPUS - 1);
128 atomic_clear_mask(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
129 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
130}
131
132static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
133{
134 atomic_clear_mask(CPUSTAT_ECALL_PEND |
135 CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
136 &vcpu->arch.sie_block->cpuflags);
137 vcpu->arch.sie_block->lctl = 0x0000;
48a3e950 138 vcpu->arch.sie_block->ictl &= ~ICTL_LPSW;
ba5c1e9b
CO		 139}
140
141static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
142{
143 atomic_set_mask(flag, &vcpu->arch.sie_block->cpuflags);
144}
145
146static void __set_intercept_indicator(struct kvm_vcpu *vcpu,
180c12fb 147 struct kvm_s390_interrupt_info *inti)
ba5c1e9b
CO		 148{
149 switch (inti->type) {
7697e71f 150 case KVM_S390_INT_EXTERNAL_CALL:
ba5c1e9b
CO		 151 case KVM_S390_INT_EMERGENCY:
152 case KVM_S390_INT_SERVICE:
153 case KVM_S390_INT_VIRTIO:
154 if (psw_extint_disabled(vcpu))
155 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
156 else
157 vcpu->arch.sie_block->lctl |= LCTL_CR0;
158 break;
159 case KVM_S390_SIGP_STOP:
160 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
161 break;
48a3e950
CH		 162 case KVM_S390_MCHK:
163 if (psw_mchk_disabled(vcpu))
164 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
165 else
166 vcpu->arch.sie_block->lctl |= LCTL_CR14;
167 break;
d8346b7d
CH		 168 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
169 if (psw_ioint_disabled(vcpu))
170 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
171 else
172 vcpu->arch.sie_block->lctl |= LCTL_CR6;
173 break;
ba5c1e9b
CO		 174 default:
175 BUG();
176 }
177}
178
179static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
180c12fb 180 struct kvm_s390_interrupt_info *inti)
ba5c1e9b
CO		 181{
182 const unsigned short table[] = { 2, 4, 4, 6 };
dc5008b9 183 int rc = 0;
ba5c1e9b
CO		 184
185 switch (inti->type) {
186 case KVM_S390_INT_EMERGENCY:
187 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp emerg");
188 vcpu->stat.deliver_emergency_signal++;
ade38c31
CH		 189 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
190 inti->emerg.code, 0);
0a75ca27 191 rc = put_guest(vcpu, 0x1201, (u16 __user *)__LC_EXT_INT_CODE);
396083a9 192 rc |= put_guest(vcpu, inti->emerg.code,
0a75ca27 193 (u16 __user *)__LC_EXT_CPU_ADDR);
dc5008b9
HC		 194 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
195 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
196 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
197 __LC_EXT_NEW_PSW, sizeof(psw_t));
ba5c1e9b 198 break;
7697e71f
CE		 199 case KVM_S390_INT_EXTERNAL_CALL:
200 VCPU_EVENT(vcpu, 4, "%s", "interrupt: sigp ext call");
201 vcpu->stat.deliver_external_call++;
ade38c31
CH		 202 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
203 inti->extcall.code, 0);
0a75ca27 204 rc = put_guest(vcpu, 0x1202, (u16 __user *)__LC_EXT_INT_CODE);
396083a9 205 rc |= put_guest(vcpu, inti->extcall.code,
0a75ca27 206 (u16 __user *)__LC_EXT_CPU_ADDR);
dc5008b9
HC		 207 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
208 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
209 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
210 __LC_EXT_NEW_PSW, sizeof(psw_t));
7697e71f 211 break;
ba5c1e9b
CO		 212 case KVM_S390_INT_SERVICE:
213 VCPU_EVENT(vcpu, 4, "interrupt: sclp parm:%x",
214 inti->ext.ext_params);
215 vcpu->stat.deliver_service_signal++;
ade38c31
CH		 216 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
217 inti->ext.ext_params, 0);
0a75ca27 218 rc = put_guest(vcpu, 0x2401, (u16 __user *)__LC_EXT_INT_CODE);
dc5008b9
HC		 219 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
220 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
221 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
222 __LC_EXT_NEW_PSW, sizeof(psw_t));
396083a9 223 rc |= put_guest(vcpu, inti->ext.ext_params,
0a75ca27 224 (u32 __user *)__LC_EXT_PARAMS);
ba5c1e9b 225 break;
ba5c1e9b 226 case KVM_S390_INT_VIRTIO:
33e19115 227 VCPU_EVENT(vcpu, 4, "interrupt: virtio parm:%x,parm64:%llx",
ba5c1e9b
CO		 228 inti->ext.ext_params, inti->ext.ext_params2);
229 vcpu->stat.deliver_virtio_interrupt++;
ade38c31
CH		 230 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
231 inti->ext.ext_params,
232 inti->ext.ext_params2);
0a75ca27
HC		 233 rc = put_guest(vcpu, 0x2603, (u16 __user *)__LC_EXT_INT_CODE);
234 rc |= put_guest(vcpu, 0x0d00, (u16 __user *)__LC_EXT_CPU_ADDR);
dc5008b9
HC		 235 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
236 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
237 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
238 __LC_EXT_NEW_PSW, sizeof(psw_t));
396083a9 239 rc |= put_guest(vcpu, inti->ext.ext_params,
0a75ca27 240 (u32 __user *)__LC_EXT_PARAMS);
396083a9 241 rc |= put_guest(vcpu, inti->ext.ext_params2,
0a75ca27 242 (u64 __user *)__LC_EXT_PARAMS2);
ba5c1e9b 243 break;
ba5c1e9b
CO		 244 case KVM_S390_SIGP_STOP:
245 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu stop");
246 vcpu->stat.deliver_stop_signal++;
ade38c31
CH		 247 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
248 0, 0);
ba5c1e9b
CO		 249 __set_intercept_indicator(vcpu, inti);
250 break;
251
252 case KVM_S390_SIGP_SET_PREFIX:
253 VCPU_EVENT(vcpu, 4, "interrupt: set prefix to %x",
254 inti->prefix.address);
255 vcpu->stat.deliver_prefix_signal++;
ade38c31
CH		 256 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
257 inti->prefix.address, 0);
8d26cf7b 258 kvm_s390_set_prefix(vcpu, inti->prefix.address);
ba5c1e9b
CO		 259 break;
260
261 case KVM_S390_RESTART:
262 VCPU_EVENT(vcpu, 4, "%s", "interrupt: cpu restart");
263 vcpu->stat.deliver_restart_signal++;
ade38c31
CH		 264 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
265 0, 0);
dc5008b9
HC		 266 rc = copy_to_guest(vcpu,
267 offsetof(struct _lowcore, restart_old_psw),
268 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
269 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
270 offsetof(struct _lowcore, restart_psw),
271 sizeof(psw_t));
9e6dabef 272 atomic_clear_mask(CPUSTAT_STOPPED, &vcpu->arch.sie_block->cpuflags);
ba5c1e9b 273 break;
ba5c1e9b
CO		 274 case KVM_S390_PROGRAM_INT:
275 VCPU_EVENT(vcpu, 4, "interrupt: pgm check code:%x, ilc:%x",
276 inti->pgm.code,
277 table[vcpu->arch.sie_block->ipa >> 14]);
278 vcpu->stat.deliver_program_int++;
ade38c31
CH		 279 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
280 inti->pgm.code, 0);
0a75ca27 281 rc = put_guest(vcpu, inti->pgm.code, (u16 __user *)__LC_PGM_INT_CODE);
396083a9 282 rc |= put_guest(vcpu, table[vcpu->arch.sie_block->ipa >> 14],
0a75ca27 283 (u16 __user *)__LC_PGM_ILC);
dc5008b9
HC		 284 rc |= copy_to_guest(vcpu, __LC_PGM_OLD_PSW,
285 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
286 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
287 __LC_PGM_NEW_PSW, sizeof(psw_t));
ba5c1e9b
CO		 288 break;
289
48a3e950
CH		 290 case KVM_S390_MCHK:
291 VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
292 inti->mchk.mcic);
293 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
294 inti->mchk.cr14,
295 inti->mchk.mcic);
dc5008b9
HC		 296 rc = kvm_s390_vcpu_store_status(vcpu,
297 KVM_S390_STORE_STATUS_PREFIXED);
0a75ca27 298 rc |= put_guest(vcpu, inti->mchk.mcic, (u64 __user *) __LC_MCCK_CODE);
dc5008b9
HC		 299 rc |= copy_to_guest(vcpu, __LC_MCK_OLD_PSW,
300 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
301 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
302 __LC_MCK_NEW_PSW, sizeof(psw_t));
48a3e950
CH		 303 break;
304
d8346b7d
CH		 305 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
306 {
307 __u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
308 inti->io.subchannel_nr;
309 __u64 param1 = ((__u64)inti->io.io_int_parm << 32) |
310 inti->io.io_int_word;
311 VCPU_EVENT(vcpu, 4, "interrupt: I/O %llx", inti->type);
312 vcpu->stat.deliver_io_int++;
313 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
314 param0, param1);
396083a9 315 rc = put_guest(vcpu, inti->io.subchannel_id,
0a75ca27 316 (u16 __user *) __LC_SUBCHANNEL_ID);
396083a9 317 rc |= put_guest(vcpu, inti->io.subchannel_nr,
0a75ca27 318 (u16 __user *) __LC_SUBCHANNEL_NR);
396083a9 319 rc |= put_guest(vcpu, inti->io.io_int_parm,
0a75ca27 320 (u32 __user *) __LC_IO_INT_PARM);
396083a9 321 rc |= put_guest(vcpu, inti->io.io_int_word,
0a75ca27 322 (u32 __user *) __LC_IO_INT_WORD);
dc5008b9
HC		 323 rc |= copy_to_guest(vcpu, __LC_IO_OLD_PSW,
324 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
325 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
326 __LC_IO_NEW_PSW, sizeof(psw_t));
d8346b7d
CH		 327 break;
328 }
ba5c1e9b
CO		 329 default:
330 BUG();
331 }
dc5008b9 332 if (rc) {
3cd61299 333 printk("kvm: The guest lowcore is not mapped during interrupt "
dc5008b9 334 "delivery, killing userspace\n");
3cd61299 335 do_exit(SIGKILL);
ba5c1e9b
CO		 336 }
337}
338
339static int __try_deliver_ckc_interrupt(struct kvm_vcpu *vcpu)
340{
dc5008b9 341 int rc;
ba5c1e9b
CO		 342
343 if (psw_extint_disabled(vcpu))
344 return 0;
345 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
346 return 0;
0a75ca27 347 rc = put_guest(vcpu, 0x1004, (u16 __user *)__LC_EXT_INT_CODE);
dc5008b9
HC		 348 rc |= copy_to_guest(vcpu, __LC_EXT_OLD_PSW,
349 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
350 rc |= copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
351 __LC_EXT_NEW_PSW, sizeof(psw_t));
352 if (rc) {
3cd61299
CB		 353 printk("kvm: The guest lowcore is not mapped during interrupt "
354 "delivery, killing userspace\n");
355 do_exit(SIGKILL);
ba5c1e9b 356 }
ba5c1e9b
CO		 357 return 1;
358}
359
a1b37100 360static int kvm_cpu_has_interrupt(struct kvm_vcpu *vcpu)
ba5c1e9b 361{
180c12fb
CB		 362 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
363 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
364 struct kvm_s390_interrupt_info *inti;
ba5c1e9b
CO		 365 int rc = 0;
366
367 if (atomic_read(&li->active)) {
368 spin_lock_bh(&li->lock);
369 list_for_each_entry(inti, &li->list, list)
370 if (__interrupt_is_deliverable(vcpu, inti)) {
371 rc = 1;
372 break;
373 }
374 spin_unlock_bh(&li->lock);
375 }
376
377 if ((!rc) && atomic_read(&fi->active)) {
b037a4f3 378 spin_lock(&fi->lock);
ba5c1e9b
CO		 379 list_for_each_entry(inti, &fi->list, list)
380 if (__interrupt_is_deliverable(vcpu, inti)) {
381 rc = 1;
382 break;
383 }
b037a4f3 384 spin_unlock(&fi->lock);
ba5c1e9b
CO		 385 }
386
387 if ((!rc) && (vcpu->arch.sie_block->ckc <
8c071b0f 388 get_tod_clock_fast() + vcpu->arch.sie_block->epoch)) {
ba5c1e9b
CO		 389 if ((!psw_extint_disabled(vcpu)) &&
390 (vcpu->arch.sie_block->gcr[0] & 0x800ul))
391 rc = 1;
392 }
393
394 return rc;
395}
396
3d80840d
MT		 397int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
398{
399 return 0;
400}
401
ba5c1e9b
CO		 402int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
403{
404 u64 now, sltime;
405 DECLARE_WAITQUEUE(wait, current);
406
407 vcpu->stat.exit_wait_state++;
408 if (kvm_cpu_has_interrupt(vcpu))
409 return 0;
410
e52b2af5
CO		 411 __set_cpu_idle(vcpu);
412 spin_lock_bh(&vcpu->arch.local_int.lock);
413 vcpu->arch.local_int.timer_due = 0;
414 spin_unlock_bh(&vcpu->arch.local_int.lock);
415
ba5c1e9b
CO		 416 if (psw_interrupts_disabled(vcpu)) {
417 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
418 __unset_cpu_idle(vcpu);
b8e660b8 419 return -EOPNOTSUPP; /* disabled wait */
ba5c1e9b
CO		 420 }
421
422 if (psw_extint_disabled(vcpu) ||
423 (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))) {
424 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
425 goto no_timer;
426 }
427
8c071b0f 428 now = get_tod_clock_fast() + vcpu->arch.sie_block->epoch;
ba5c1e9b
CO		 429 if (vcpu->arch.sie_block->ckc < now) {
430 __unset_cpu_idle(vcpu);
431 return 0;
432 }
433
ed4f2094 434 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
ba5c1e9b 435
ca872302
CB		 436 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
437 VCPU_EVENT(vcpu, 5, "enabled wait via clock comparator: %llx ns", sltime);
ba5c1e9b 438no_timer:
800c1065 439 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
b037a4f3 440 spin_lock(&vcpu->arch.local_int.float_int->lock);
ba5c1e9b 441 spin_lock_bh(&vcpu->arch.local_int.lock);
d0321a24 442 add_wait_queue(&vcpu->wq, &wait);
ba5c1e9b
CO		 443 while (list_empty(&vcpu->arch.local_int.list) &&
444 list_empty(&vcpu->arch.local_int.float_int->list) &&
445 (!vcpu->arch.local_int.timer_due) &&
446 !signal_pending(current)) {
447 set_current_state(TASK_INTERRUPTIBLE);
448 spin_unlock_bh(&vcpu->arch.local_int.lock);
b037a4f3 449 spin_unlock(&vcpu->arch.local_int.float_int->lock);
ba5c1e9b 450 schedule();
b037a4f3 451 spin_lock(&vcpu->arch.local_int.float_int->lock);
ba5c1e9b
CO		 452 spin_lock_bh(&vcpu->arch.local_int.lock);
453 }
454 __unset_cpu_idle(vcpu);
455 __set_current_state(TASK_RUNNING);
d0321a24 456 remove_wait_queue(&vcpu->wq, &wait);
ba5c1e9b 457 spin_unlock_bh(&vcpu->arch.local_int.lock);
b037a4f3 458 spin_unlock(&vcpu->arch.local_int.float_int->lock);
800c1065
TH		 459 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
460
ca872302 461 hrtimer_try_to_cancel(&vcpu->arch.ckc_timer);
ba5c1e9b
CO		 462 return 0;
463}
464
ca872302 465void kvm_s390_tasklet(unsigned long parm)
ba5c1e9b 466{
ca872302 467 struct kvm_vcpu *vcpu = (struct kvm_vcpu *) parm;
ba5c1e9b 468
ca872302 469 spin_lock(&vcpu->arch.local_int.lock);
ba5c1e9b 470 vcpu->arch.local_int.timer_due = 1;
d0321a24
CB		 471 if (waitqueue_active(&vcpu->wq))
472 wake_up_interruptible(&vcpu->wq);
ca872302 473 spin_unlock(&vcpu->arch.local_int.lock);
ba5c1e9b
CO		 474}
475
ca872302
CB		 476/*
477 * low level hrtimer wake routine. Because this runs in hardirq context
478 * we schedule a tasklet to do the real work.
479 */
480enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
481{
482 struct kvm_vcpu *vcpu;
483
484 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
485 tasklet_schedule(&vcpu->arch.tasklet);
486
487 return HRTIMER_NORESTART;
488}
ba5c1e9b
CO		 489
490void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
491{
180c12fb
CB		 492 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
493 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
494 struct kvm_s390_interrupt_info *n, *inti = NULL;
ba5c1e9b
CO		 495 int deliver;
496
497 __reset_intercept_indicators(vcpu);
498 if (atomic_read(&li->active)) {
499 do {
500 deliver = 0;
501 spin_lock_bh(&li->lock);
502 list_for_each_entry_safe(inti, n, &li->list, list) {
503 if (__interrupt_is_deliverable(vcpu, inti)) {
504 list_del(&inti->list);
505 deliver = 1;
506 break;
507 }
508 __set_intercept_indicator(vcpu, inti);
509 }
510 if (list_empty(&li->list))
511 atomic_set(&li->active, 0);
512 spin_unlock_bh(&li->lock);
513 if (deliver) {
514 __do_deliver_interrupt(vcpu, inti);
515 kfree(inti);
516 }
517 } while (deliver);
518 }
519
520 if ((vcpu->arch.sie_block->ckc <
8c071b0f 521 get_tod_clock_fast() + vcpu->arch.sie_block->epoch))
ba5c1e9b
CO		 522 __try_deliver_ckc_interrupt(vcpu);
523
524 if (atomic_read(&fi->active)) {
525 do {
526 deliver = 0;
b037a4f3 527 spin_lock(&fi->lock);
ba5c1e9b
CO		 528 list_for_each_entry_safe(inti, n, &fi->list, list) {
529 if (__interrupt_is_deliverable(vcpu, inti)) {
530 list_del(&inti->list);
531 deliver = 1;
532 break;
533 }
534 __set_intercept_indicator(vcpu, inti);
535 }
536 if (list_empty(&fi->list))
537 atomic_set(&fi->active, 0);
b037a4f3 538 spin_unlock(&fi->lock);
ba5c1e9b
CO		 539 if (deliver) {
540 __do_deliver_interrupt(vcpu, inti);
541 kfree(inti);
542 }
543 } while (deliver);
544 }
545}
546
48a3e950
CH		 547void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
548{
549 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
550 struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
551 struct kvm_s390_interrupt_info *n, *inti = NULL;
552 int deliver;
553
554 __reset_intercept_indicators(vcpu);
555 if (atomic_read(&li->active)) {
556 do {
557 deliver = 0;
558 spin_lock_bh(&li->lock);
559 list_for_each_entry_safe(inti, n, &li->list, list) {
560 if ((inti->type == KVM_S390_MCHK) &&
561 __interrupt_is_deliverable(vcpu, inti)) {
562 list_del(&inti->list);
563 deliver = 1;
564 break;
565 }
566 __set_intercept_indicator(vcpu, inti);
567 }
568 if (list_empty(&li->list))
569 atomic_set(&li->active, 0);
570 spin_unlock_bh(&li->lock);
571 if (deliver) {
572 __do_deliver_interrupt(vcpu, inti);
573 kfree(inti);
574 }
575 } while (deliver);
576 }
577
578 if (atomic_read(&fi->active)) {
579 do {
580 deliver = 0;
581 spin_lock(&fi->lock);
582 list_for_each_entry_safe(inti, n, &fi->list, list) {
583 if ((inti->type == KVM_S390_MCHK) &&
584 __interrupt_is_deliverable(vcpu, inti)) {
585 list_del(&inti->list);
586 deliver = 1;
587 break;
588 }
589 __set_intercept_indicator(vcpu, inti);
590 }
591 if (list_empty(&fi->list))
592 atomic_set(&fi->active, 0);
593 spin_unlock(&fi->lock);
594 if (deliver) {
595 __do_deliver_interrupt(vcpu, inti);
596 kfree(inti);
597 }
598 } while (deliver);
599 }
600}
601
ba5c1e9b
CO		 602int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
603{
180c12fb
CB		 604 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
605 struct kvm_s390_interrupt_info *inti;
ba5c1e9b
CO		 606
607 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
608 if (!inti)
609 return -ENOMEM;
610
a419aef8 611 inti->type = KVM_S390_PROGRAM_INT;
ba5c1e9b
CO		 612 inti->pgm.code = code;
613
614 VCPU_EVENT(vcpu, 3, "inject: program check %d (from kernel)", code);
ade38c31 615 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, inti->type, code, 0, 1);
ba5c1e9b
CO		 616 spin_lock_bh(&li->lock);
617 list_add(&inti->list, &li->list);
618 atomic_set(&li->active, 1);
d0321a24 619 BUG_ON(waitqueue_active(li->wq));
ba5c1e9b
CO		 620 spin_unlock_bh(&li->lock);
621 return 0;
622}
623
fa6b7fe9
CH		 624struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
625 u64 cr6, u64 schid)
626{
627 struct kvm_s390_float_interrupt *fi;
628 struct kvm_s390_interrupt_info *inti, *iter;
629
630 if ((!schid && !cr6) || (schid && cr6))
631 return NULL;
632 mutex_lock(&kvm->lock);
633 fi = &kvm->arch.float_int;
634 spin_lock(&fi->lock);
635 inti = NULL;
636 list_for_each_entry(iter, &fi->list, list) {
637 if (!is_ioint(iter->type))
638 continue;
79fd50c6
CH		 639 if (cr6 &&
640 ((cr6 & int_word_to_isc_bits(iter->io.io_int_word)) == 0))
fa6b7fe9
CH		 641 continue;
642 if (schid) {
643 if (((schid & 0x00000000ffff0000) >> 16) !=
644 iter->io.subchannel_id)
645 continue;
646 if ((schid & 0x000000000000ffff) !=
647 iter->io.subchannel_nr)
648 continue;
649 }
650 inti = iter;
651 break;
652 }
653 if (inti)
654 list_del_init(&inti->list);
655 if (list_empty(&fi->list))
656 atomic_set(&fi->active, 0);
657 spin_unlock(&fi->lock);
658 mutex_unlock(&kvm->lock);
659 return inti;
660}
ba5c1e9b 661
c05c4186 662static void __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
ba5c1e9b 663{
180c12fb
CB		 664 struct kvm_s390_local_interrupt *li;
665 struct kvm_s390_float_interrupt *fi;
c05c4186 666 struct kvm_s390_interrupt_info *iter;
ba5c1e9b
CO		 667 int sigcpu;
668
c05c4186
JF		 669 mutex_lock(&kvm->lock);
670 fi = &kvm->arch.float_int;
671 spin_lock(&fi->lock);
672 if (!is_ioint(inti->type)) {
673 list_add_tail(&inti->list, &fi->list);
674 } else {
675 u64 isc_bits = int_word_to_isc_bits(inti->io.io_int_word);
676
677 /* Keep I/O interrupts sorted in isc order. */
678 list_for_each_entry(iter, &fi->list, list) {
679 if (!is_ioint(iter->type))
680 continue;
681 if (int_word_to_isc_bits(iter->io.io_int_word)
682 <= isc_bits)
683 continue;
684 break;
685 }
686 list_add_tail(&inti->list, &iter->list);
687 }
688 atomic_set(&fi->active, 1);
689 sigcpu = find_first_bit(fi->idle_mask, KVM_MAX_VCPUS);
690 if (sigcpu == KVM_MAX_VCPUS) {
691 do {
692 sigcpu = fi->next_rr_cpu++;
693 if (sigcpu == KVM_MAX_VCPUS)
694 sigcpu = fi->next_rr_cpu = 0;
695 } while (fi->local_int[sigcpu] == NULL);
696 }
697 li = fi->local_int[sigcpu];
698 spin_lock_bh(&li->lock);
699 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
700 if (waitqueue_active(li->wq))
701 wake_up_interruptible(li->wq);
702 spin_unlock_bh(&li->lock);
703 spin_unlock(&fi->lock);
704 mutex_unlock(&kvm->lock);
705}
706
707int kvm_s390_inject_vm(struct kvm *kvm,
708 struct kvm_s390_interrupt *s390int)
709{
710 struct kvm_s390_interrupt_info *inti;
711
ba5c1e9b
CO		 712 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
713 if (!inti)
714 return -ENOMEM;
715
c05c4186
JF		 716 inti->type = s390int->type;
717 switch (inti->type) {
ba5c1e9b 718 case KVM_S390_INT_VIRTIO:
33e19115 719 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
ba5c1e9b 720 s390int->parm, s390int->parm64);
ba5c1e9b
CO		 721 inti->ext.ext_params = s390int->parm;
722 inti->ext.ext_params2 = s390int->parm64;
723 break;
724 case KVM_S390_INT_SERVICE:
725 VM_EVENT(kvm, 5, "inject: sclp parm:%x", s390int->parm);
ba5c1e9b
CO		 726 inti->ext.ext_params = s390int->parm;
727 break;
48a3e950
CH		 728 case KVM_S390_MCHK:
729 VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
730 s390int->parm64);
48a3e950
CH		 731 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
732 inti->mchk.mcic = s390int->parm64;
733 break;
d8346b7d 734 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
c05c4186 735 if (inti->type & IOINT_AI_MASK)
d8346b7d
CH		 736 VM_EVENT(kvm, 5, "%s", "inject: I/O (AI)");
737 else
738 VM_EVENT(kvm, 5, "inject: I/O css %x ss %x schid %04x",
739 s390int->type & IOINT_CSSID_MASK,
740 s390int->type & IOINT_SSID_MASK,
741 s390int->type & IOINT_SCHID_MASK);
d8346b7d
CH		 742 inti->io.subchannel_id = s390int->parm >> 16;
743 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
744 inti->io.io_int_parm = s390int->parm64 >> 32;
745 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
746 break;
ba5c1e9b
CO		 747 default:
748 kfree(inti);
749 return -EINVAL;
750 }
ade38c31
CH		 751 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
752 2);
ba5c1e9b 753
c05c4186 754 __inject_vm(kvm, inti);
ba5c1e9b
CO		 755 return 0;
756}
757
758int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
759 struct kvm_s390_interrupt *s390int)
760{
180c12fb
CB		 761 struct kvm_s390_local_interrupt *li;
762 struct kvm_s390_interrupt_info *inti;
ba5c1e9b
CO		 763
764 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
765 if (!inti)
766 return -ENOMEM;
767
768 switch (s390int->type) {
769 case KVM_S390_PROGRAM_INT:
770 if (s390int->parm & 0xffff0000) {
771 kfree(inti);
772 return -EINVAL;
773 }
774 inti->type = s390int->type;
775 inti->pgm.code = s390int->parm;
776 VCPU_EVENT(vcpu, 3, "inject: program check %d (from user)",
777 s390int->parm);
778 break;
b7e6e4d3
CB		 779 case KVM_S390_SIGP_SET_PREFIX:
780 inti->prefix.address = s390int->parm;
781 inti->type = s390int->type;
782 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x (from user)",
783 s390int->parm);
784 break;
ba5c1e9b
CO		 785 case KVM_S390_SIGP_STOP:
786 case KVM_S390_RESTART:
82a12737
JH		 787 VCPU_EVENT(vcpu, 3, "inject: type %x", s390int->type);
788 inti->type = s390int->type;
789 break;
7697e71f 790 case KVM_S390_INT_EXTERNAL_CALL:
82a12737
JH		 791 if (s390int->parm & 0xffff0000) {
792 kfree(inti);
793 return -EINVAL;
794 }
795 VCPU_EVENT(vcpu, 3, "inject: external call source-cpu:%u",
796 s390int->parm);
797 inti->type = s390int->type;
798 inti->extcall.code = s390int->parm;
799 break;
ba5c1e9b 800 case KVM_S390_INT_EMERGENCY:
82a12737
JH		 801 if (s390int->parm & 0xffff0000) {
802 kfree(inti);
803 return -EINVAL;
804 }
805 VCPU_EVENT(vcpu, 3, "inject: emergency %u\n", s390int->parm);
ba5c1e9b 806 inti->type = s390int->type;
82a12737 807 inti->emerg.code = s390int->parm;
ba5c1e9b 808 break;
48a3e950
CH		 809 case KVM_S390_MCHK:
810 VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
811 s390int->parm64);
812 inti->type = s390int->type;
813 inti->mchk.mcic = s390int->parm64;
814 break;
ba5c1e9b
CO		 815 case KVM_S390_INT_VIRTIO:
816 case KVM_S390_INT_SERVICE:
d8346b7d 817 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
ba5c1e9b
CO		 818 default:
819 kfree(inti);
820 return -EINVAL;
821 }
ade38c31
CH		 822 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, s390int->type, s390int->parm,
823 s390int->parm64, 2);
ba5c1e9b
CO		 824
825 mutex_lock(&vcpu->kvm->lock);
826 li = &vcpu->arch.local_int;
827 spin_lock_bh(&li->lock);
828 if (inti->type == KVM_S390_PROGRAM_INT)
829 list_add(&inti->list, &li->list);
830 else
831 list_add_tail(&inti->list, &li->list);
832 atomic_set(&li->active, 1);
833 if (inti->type == KVM_S390_SIGP_STOP)
834 li->action_bits |= ACTION_STOP_ON_STOP;
835 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
d0321a24
CB		 836 if (waitqueue_active(&vcpu->wq))
837 wake_up_interruptible(&vcpu->wq);
ba5c1e9b
CO		 838 spin_unlock_bh(&li->lock);
839 mutex_unlock(&vcpu->kvm->lock);
840 return 0;
841}
c05c4186
JF		 842
843static void clear_floating_interrupts(struct kvm *kvm)
844{
845 struct kvm_s390_float_interrupt *fi;
846 struct kvm_s390_interrupt_info *n, *inti = NULL;
847
848 mutex_lock(&kvm->lock);
849 fi = &kvm->arch.float_int;
850 spin_lock(&fi->lock);
851 list_for_each_entry_safe(inti, n, &fi->list, list) {
852 list_del(&inti->list);
853 kfree(inti);
854 }
855 atomic_set(&fi->active, 0);
856 spin_unlock(&fi->lock);
857 mutex_unlock(&kvm->lock);
858}
859
860static inline int copy_irq_to_user(struct kvm_s390_interrupt_info *inti,
861 u8 *addr)
862{
863 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
864 struct kvm_s390_irq irq = {0};
865
866 irq.type = inti->type;
867 switch (inti->type) {
868 case KVM_S390_INT_VIRTIO:
869 case KVM_S390_INT_SERVICE:
870 irq.u.ext = inti->ext;
871 break;
872 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
873 irq.u.io = inti->io;
874 break;
875 case KVM_S390_MCHK:
876 irq.u.mchk = inti->mchk;
877 break;
878 default:
879 return -EINVAL;
880 }
881
882 if (copy_to_user(uptr, &irq, sizeof(irq)))
883 return -EFAULT;
884
885 return 0;
886}
887
888static int get_all_floating_irqs(struct kvm *kvm, __u8 *buf, __u64 len)
889{
890 struct kvm_s390_interrupt_info *inti;
891 struct kvm_s390_float_interrupt *fi;
892 int ret = 0;
893 int n = 0;
894
895 mutex_lock(&kvm->lock);
896 fi = &kvm->arch.float_int;
897 spin_lock(&fi->lock);
898
899 list_for_each_entry(inti, &fi->list, list) {
900 if (len < sizeof(struct kvm_s390_irq)) {
901 /* signal userspace to try again */
902 ret = -ENOMEM;
903 break;
904 }
905 ret = copy_irq_to_user(inti, buf);
906 if (ret)
907 break;
908 buf += sizeof(struct kvm_s390_irq);
909 len -= sizeof(struct kvm_s390_irq);
910 n++;
911 }
912
913 spin_unlock(&fi->lock);
914 mutex_unlock(&kvm->lock);
915
916 return ret < 0 ? ret : n;
917}
918
919static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
920{
921 int r;
922
923 switch (attr->group) {
924 case KVM_DEV_FLIC_GET_ALL_IRQS:
925 r = get_all_floating_irqs(dev->kvm, (u8 *) attr->addr,
926 attr->attr);
927 break;
928 default:
929 r = -EINVAL;
930 }
931
932 return r;
933}
934
935static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
936 u64 addr)
937{
938 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
939 void *target = NULL;
940 void __user *source;
941 u64 size;
942
943 if (get_user(inti->type, (u64 __user *)addr))
944 return -EFAULT;
945
946 switch (inti->type) {
947 case KVM_S390_INT_VIRTIO:
948 case KVM_S390_INT_SERVICE:
949 target = (void *) &inti->ext;
950 source = &uptr->u.ext;
951 size = sizeof(inti->ext);
952 break;
953 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
954 target = (void *) &inti->io;
955 source = &uptr->u.io;
956 size = sizeof(inti->io);
957 break;
958 case KVM_S390_MCHK:
959 target = (void *) &inti->mchk;
960 source = &uptr->u.mchk;
961 size = sizeof(inti->mchk);
962 break;
963 default:
964 return -EINVAL;
965 }
966
967 if (copy_from_user(target, source, size))
968 return -EFAULT;
969
970 return 0;
971}
972
973static int enqueue_floating_irq(struct kvm_device *dev,
974 struct kvm_device_attr *attr)
975{
976 struct kvm_s390_interrupt_info *inti = NULL;
977 int r = 0;
978 int len = attr->attr;
979
980 if (len % sizeof(struct kvm_s390_irq) != 0)
981 return -EINVAL;
982 else if (len > KVM_S390_FLIC_MAX_BUFFER)
983 return -EINVAL;
984
985 while (len >= sizeof(struct kvm_s390_irq)) {
986 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
987 if (!inti)
988 return -ENOMEM;
989
990 r = copy_irq_from_user(inti, attr->addr);
991 if (r) {
992 kfree(inti);
993 return r;
994 }
995 __inject_vm(dev->kvm, inti);
996 len -= sizeof(struct kvm_s390_irq);
997 attr->addr += sizeof(struct kvm_s390_irq);
998 }
999
1000 return r;
1001}
1002
1003static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1004{
1005 int r = 0;
1006
1007 switch (attr->group) {
1008 case KVM_DEV_FLIC_ENQUEUE:
1009 r = enqueue_floating_irq(dev, attr);
1010 break;
1011 case KVM_DEV_FLIC_CLEAR_IRQS:
1012 r = 0;
1013 clear_floating_interrupts(dev->kvm);
1014 break;
1015 default:
1016 r = -EINVAL;
1017 }
1018
1019 return r;
1020}
1021
1022static int flic_create(struct kvm_device *dev, u32 type)
1023{
1024 if (!dev)
1025 return -EINVAL;
1026 if (dev->kvm->arch.flic)
1027 return -EINVAL;
1028 dev->kvm->arch.flic = dev;
1029 return 0;
1030}
1031
1032static void flic_destroy(struct kvm_device *dev)
1033{
1034 dev->kvm->arch.flic = NULL;
1035 kfree(dev);
1036}
1037
1038/* s390 floating irq controller (flic) */
1039struct kvm_device_ops kvm_flic_ops = {
1040 .name = "kvm-flic",
1041 .get_attr = flic_get_attr,
1042 .set_attr = flic_set_attr,
1043 .create = flic_create,
1044 .destroy = flic_destroy,
1045};
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