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KVM: s390: factor out actual delivery of machine checks
[mirror_ubuntu-kernels.git] / arch / s390 / kvm / interrupt.c
CommitLineData
ba5c1e9b 1/*
a53c8fab 2 * handling kvm guest interrupts
ba5c1e9b 3 *
33b412ac 4 * Copyright IBM Corp. 2008, 2015
ba5c1e9b
CO		 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>
84223598 16#include <linux/mmu_context.h>
3cd61299 17#include <linux/signal.h>
5a0e3ad6 18#include <linux/slab.h>
383d0b05 19#include <linux/bitmap.h>
94aa033e 20#include <linux/vmalloc.h>
cbb870c8 21#include <asm/asm-offsets.h>
33b412ac 22#include <asm/dis.h>
cbb870c8 23#include <asm/uaccess.h>
ea5f4969 24#include <asm/sclp.h>
6d3da241 25#include <asm/isc.h>
1e133ab2 26#include <asm/gmap.h>
ba5c1e9b
CO		 27#include "kvm-s390.h"
28#include "gaccess.h"
ade38c31 29#include "trace-s390.h"
ba5c1e9b 30
44c6ca3d 31#define PFAULT_INIT 0x0600
60f90a14
JF		 32#define PFAULT_DONE 0x0680
33#define VIRTIO_PARAM 0x0d00
d8346b7d 34
a5bd7647
ED		 35/* handle external calls via sigp interpretation facility */
36static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
37{
7d43bafc
ED		 38 int c, scn;
39
2c1bb2be
DH		 40 if (!(atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND))
41 return 0;
42
5e044315 43 read_lock(&vcpu->kvm->arch.sca_lock);
7d43bafc
ED		 44 if (vcpu->kvm->arch.use_esca) {
45 struct esca_block *sca = vcpu->kvm->arch.sca;
46 union esca_sigp_ctrl sigp_ctrl =
47 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
48
49 c = sigp_ctrl.c;
50 scn = sigp_ctrl.scn;
51 } else {
52 struct bsca_block *sca = vcpu->kvm->arch.sca;
53 union bsca_sigp_ctrl sigp_ctrl =
54 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
55
56 c = sigp_ctrl.c;
57 scn = sigp_ctrl.scn;
58 }
5e044315 59 read_unlock(&vcpu->kvm->arch.sca_lock);
a5bd7647
ED		 60
61 if (src_id)
7d43bafc 62 *src_id = scn;
a5bd7647 63
2c1bb2be 64 return c;
a5bd7647
ED		 65}
66
67static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
68{
bc784cce 69 int expect, rc;
a5bd7647 70
5e044315 71 read_lock(&vcpu->kvm->arch.sca_lock);
7d43bafc
ED		 72 if (vcpu->kvm->arch.use_esca) {
73 struct esca_block *sca = vcpu->kvm->arch.sca;
74 union esca_sigp_ctrl *sigp_ctrl =
75 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
76 union esca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
77
78 new_val.scn = src_id;
79 new_val.c = 1;
80 old_val.c = 0;
81
82 expect = old_val.value;
83 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
84 } else {
85 struct bsca_block *sca = vcpu->kvm->arch.sca;
86 union bsca_sigp_ctrl *sigp_ctrl =
87 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
88 union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl;
bc784cce 89
7d43bafc
ED		 90 new_val.scn = src_id;
91 new_val.c = 1;
92 old_val.c = 0;
93
94 expect = old_val.value;
95 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
96 }
5e044315 97 read_unlock(&vcpu->kvm->arch.sca_lock);
bc784cce
ED		 98
99 if (rc != expect) {
a5bd7647
ED		 100 /* another external call is pending */
101 return -EBUSY;
102 }
103 atomic_or(CPUSTAT_ECALL_PEND, &vcpu->arch.sie_block->cpuflags);
104 return 0;
105}
106
107static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
108{
a5bd7647 109 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
7d43bafc 110 int rc, expect;
a5bd7647
ED		 111
112 atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags);
5e044315 113 read_lock(&vcpu->kvm->arch.sca_lock);
7d43bafc
ED		 114 if (vcpu->kvm->arch.use_esca) {
115 struct esca_block *sca = vcpu->kvm->arch.sca;
116 union esca_sigp_ctrl *sigp_ctrl =
117 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
118 union esca_sigp_ctrl old = *sigp_ctrl;
119
120 expect = old.value;
121 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
122 } else {
123 struct bsca_block *sca = vcpu->kvm->arch.sca;
124 union bsca_sigp_ctrl *sigp_ctrl =
125 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
126 union bsca_sigp_ctrl old = *sigp_ctrl;
127
128 expect = old.value;
129 rc = cmpxchg(&sigp_ctrl->value, old.value, 0);
130 }
5e044315 131 read_unlock(&vcpu->kvm->arch.sca_lock);
7d43bafc 132 WARN_ON(rc != expect); /* cannot clear? */
a5bd7647
ED		 133}
134
3c038e6b 135int psw_extint_disabled(struct kvm_vcpu *vcpu)
ba5c1e9b
CO		 136{
137 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
138}
139
d8346b7d
CH		 140static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
141{
142 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
143}
144
48a3e950
CH		 145static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
146{
147 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
148}
149
ba5c1e9b
CO		 150static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
151{
fee0e0fd
DH		 152 return psw_extint_disabled(vcpu) &&
153 psw_ioint_disabled(vcpu) &&
154 psw_mchk_disabled(vcpu);
ba5c1e9b
CO		 155}
156
bb78c5ec
DH		 157static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
158{
159 if (psw_extint_disabled(vcpu) ||
160 !(vcpu->arch.sie_block->gcr[0] & 0x800ul))
161 return 0;
f71d0dc5
DH		 162 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
163 /* No timer interrupts when single stepping */
164 return 0;
bb78c5ec
DH		 165 return 1;
166}
167
b4aec925
DH		 168static int ckc_irq_pending(struct kvm_vcpu *vcpu)
169{
60417fcc 170 if (vcpu->arch.sie_block->ckc >= kvm_s390_get_tod_clock_fast(vcpu->kvm))
b4aec925
DH		 171 return 0;
172 return ckc_interrupts_enabled(vcpu);
173}
174
175static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
176{
177 return !psw_extint_disabled(vcpu) &&
178 (vcpu->arch.sie_block->gcr[0] & 0x400ul);
179}
180
181static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
182{
4287f247
DH		 183 if (!cpu_timer_interrupts_enabled(vcpu))
184 return 0;
185 return kvm_s390_get_cpu_timer(vcpu) >> 63;
b4aec925
DH		 186}
187
6d3da241 188static inline int is_ioirq(unsigned long irq_type)
79fd50c6 189{
6d3da241
JF		 190 return ((irq_type >= IRQ_PEND_IO_ISC_0) &&
191 (irq_type <= IRQ_PEND_IO_ISC_7));
192}
79fd50c6 193
6d3da241
JF		 194static uint64_t isc_to_isc_bits(int isc)
195{
79fd50c6
CH		 196 return (0x80 >> isc) << 24;
197}
198
6d3da241 199static inline u8 int_word_to_isc(u32 int_word)
ba5c1e9b 200{
6d3da241
JF		 201 return (int_word & 0x38000000) >> 27;
202}
203
5f94c58e 204static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
6d3da241 205{
5f94c58e
DH		 206 return vcpu->kvm->arch.float_int.pending_irqs |
207 vcpu->arch.local_int.pending_irqs;
383d0b05
JF		 208}
209
6d3da241
JF		 210static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
211 unsigned long active_mask)
212{
213 int i;
214
215 for (i = 0; i <= MAX_ISC; i++)
216 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
217 active_mask &= ~(1UL << (IRQ_PEND_IO_ISC_0 + i));
218
219 return active_mask;
220}
221
222static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
383d0b05 223{
6d3da241
JF		 224 unsigned long active_mask;
225
5f94c58e 226 active_mask = pending_irqs(vcpu);
ffeca0ae
JF		 227 if (!active_mask)
228 return 0;
383d0b05
JF		 229
230 if (psw_extint_disabled(vcpu))
231 active_mask &= ~IRQ_PEND_EXT_MASK;
6d3da241
JF		 232 if (psw_ioint_disabled(vcpu))
233 active_mask &= ~IRQ_PEND_IO_MASK;
234 else
235 active_mask = disable_iscs(vcpu, active_mask);
383d0b05
JF		 236 if (!(vcpu->arch.sie_block->gcr[0] & 0x2000ul))
237 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
238 if (!(vcpu->arch.sie_block->gcr[0] & 0x4000ul))
239 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
240 if (!(vcpu->arch.sie_block->gcr[0] & 0x800ul))
241 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
242 if (!(vcpu->arch.sie_block->gcr[0] & 0x400ul))
243 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
6d3da241
JF		 244 if (!(vcpu->arch.sie_block->gcr[0] & 0x200ul))
245 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
383d0b05
JF		 246 if (psw_mchk_disabled(vcpu))
247 active_mask &= ~IRQ_PEND_MCHK_MASK;
6d3da241
JF		 248 if (!(vcpu->arch.sie_block->gcr[14] &
249 vcpu->kvm->arch.float_int.mchk.cr14))
250 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
383d0b05 251
6cddd432
DH		 252 /*
253 * STOP irqs will never be actively delivered. They are triggered via
254 * intercept requests and cleared when the stop intercept is performed.
255 */
256 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
257
383d0b05
JF		 258 return active_mask;
259}
260
ba5c1e9b
CO		 261static void __set_cpu_idle(struct kvm_vcpu *vcpu)
262{
805de8f4 263 atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
ba5c1e9b
CO		 264 set_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
265}
266
267static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
268{
805de8f4 269 atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
ba5c1e9b
CO		 270 clear_bit(vcpu->vcpu_id, vcpu->arch.local_int.float_int->idle_mask);
271}
272
273static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
274{
805de8f4
PZ		 275 atomic_andnot(CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
276 &vcpu->arch.sie_block->cpuflags);
ba5c1e9b 277 vcpu->arch.sie_block->lctl = 0x0000;
27291e21
DH		 278 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
279
280 if (guestdbg_enabled(vcpu)) {
281 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
282 LCTL_CR10 | LCTL_CR11);
283 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
284 }
ba5c1e9b
CO		 285}
286
287static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
288{
805de8f4 289 atomic_or(flag, &vcpu->arch.sie_block->cpuflags);
ba5c1e9b
CO		 290}
291
6d3da241
JF		 292static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
293{
5f94c58e 294 if (!(pending_irqs(vcpu) & IRQ_PEND_IO_MASK))
6d3da241
JF		 295 return;
296 else if (psw_ioint_disabled(vcpu))
297 __set_cpuflag(vcpu, CPUSTAT_IO_INT);
298 else
299 vcpu->arch.sie_block->lctl |= LCTL_CR6;
300}
301
383d0b05
JF		 302static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
303{
5f94c58e 304 if (!(pending_irqs(vcpu) & IRQ_PEND_EXT_MASK))
383d0b05
JF		 305 return;
306 if (psw_extint_disabled(vcpu))
307 __set_cpuflag(vcpu, CPUSTAT_EXT_INT);
308 else
309 vcpu->arch.sie_block->lctl |= LCTL_CR0;
310}
311
312static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
313{
5f94c58e 314 if (!(pending_irqs(vcpu) & IRQ_PEND_MCHK_MASK))
383d0b05
JF		 315 return;
316 if (psw_mchk_disabled(vcpu))
317 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
318 else
319 vcpu->arch.sie_block->lctl |= LCTL_CR14;
320}
321
6cddd432
DH		 322static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
323{
324 if (kvm_s390_is_stop_irq_pending(vcpu))
325 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
326}
327
6d3da241
JF		 328/* Set interception request for non-deliverable interrupts */
329static void set_intercept_indicators(struct kvm_vcpu *vcpu)
383d0b05 330{
6d3da241 331 set_intercept_indicators_io(vcpu);
383d0b05
JF		 332 set_intercept_indicators_ext(vcpu);
333 set_intercept_indicators_mchk(vcpu);
6cddd432 334 set_intercept_indicators_stop(vcpu);
383d0b05
JF		 335}
336
0fb97abe
JF		 337static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
338{
383d0b05 339 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
0fb97abe
JF		 340 int rc;
341
342 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
343 0, 0);
344
345 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
346 (u16 *)__LC_EXT_INT_CODE);
467fc298 347 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
0fb97abe
JF		 348 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
349 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
350 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
351 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
383d0b05 352 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
99e20009 353 return rc ? -EFAULT : 0;
0fb97abe
JF		 354}
355
356static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
357{
383d0b05 358 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
0fb97abe
JF		 359 int rc;
360
361 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
362 0, 0);
363
364 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
365 (u16 __user *)__LC_EXT_INT_CODE);
467fc298 366 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
0fb97abe
JF		 367 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
368 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
369 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
370 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
383d0b05 371 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
99e20009 372 return rc ? -EFAULT : 0;
0fb97abe
JF		 373}
374
383d0b05 375static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
0fb97abe 376{
383d0b05
JF		 377 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
378 struct kvm_s390_ext_info ext;
0fb97abe
JF		 379 int rc;
380
383d0b05
JF		 381 spin_lock(&li->lock);
382 ext = li->irq.ext;
383 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
384 li->irq.ext.ext_params2 = 0;
385 spin_unlock(&li->lock);
386
3f24ba15
CB		 387 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
388 ext.ext_params2);
0fb97abe
JF		 389 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
390 KVM_S390_INT_PFAULT_INIT,
383d0b05 391 0, ext.ext_params2);
0fb97abe
JF		 392
393 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
394 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
395 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
396 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
397 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
398 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
383d0b05 399 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
99e20009 400 return rc ? -EFAULT : 0;
0fb97abe
JF		 401}
402
d6404ded
DH		 403static int __write_machine_check(struct kvm_vcpu *vcpu,
404 struct kvm_s390_mchk_info *mchk)
405{
406 unsigned long ext_sa_addr;
407 int rc;
408
409 /* Extended save area */
410 rc = read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR, &ext_sa_addr,
411 sizeof(unsigned long));
412 rc |= kvm_s390_vcpu_store_adtl_status(vcpu, ext_sa_addr);
413
414 /* General interruption information */
415 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
416 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
417 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
418 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
419 rc |= put_guest_lc(vcpu, mchk->mcic, (u64 __user *) __LC_MCCK_CODE);
420
421 /* Register-save areas */
422 rc |= kvm_s390_vcpu_store_status(vcpu, KVM_S390_STORE_STATUS_PREFIXED);
423
424 /* Extended interruption information */
425 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
426 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
427 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
428 sizeof(mchk->fixed_logout));
429 return rc ? -EFAULT : 0;
430}
431
383d0b05 432static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
0fb97abe 433{
6d3da241 434 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
383d0b05 435 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
6d3da241 436 struct kvm_s390_mchk_info mchk = {};
6d3da241
JF		 437 int deliver = 0;
438 int rc = 0;
0fb97abe 439
6d3da241 440 spin_lock(&fi->lock);
383d0b05 441 spin_lock(&li->lock);
6d3da241
JF		 442 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
443 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
444 /*
445 * If there was an exigent machine check pending, then any
446 * repressible machine checks that might have been pending
447 * are indicated along with it, so always clear bits for
448 * repressible and exigent interrupts
449 */
450 mchk = li->irq.mchk;
451 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
452 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
453 memset(&li->irq.mchk, 0, sizeof(mchk));
454 deliver = 1;
455 }
383d0b05 456 /*
6d3da241
JF		 457 * We indicate floating repressible conditions along with
458 * other pending conditions. Channel Report Pending and Channel
459 * Subsystem damage are the only two and and are indicated by
460 * bits in mcic and masked in cr14.
383d0b05 461 */
6d3da241
JF		 462 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
463 mchk.mcic |= fi->mchk.mcic;
464 mchk.cr14 |= fi->mchk.cr14;
465 memset(&fi->mchk, 0, sizeof(mchk));
466 deliver = 1;
467 }
383d0b05 468 spin_unlock(&li->lock);
6d3da241 469 spin_unlock(&fi->lock);
383d0b05 470
6d3da241 471 if (deliver) {
3f24ba15 472 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
6d3da241
JF		 473 mchk.mcic);
474 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
475 KVM_S390_MCHK,
476 mchk.cr14, mchk.mcic);
d6404ded 477 rc = __write_machine_check(vcpu, &mchk);
6d3da241 478 }
d6404ded 479 return rc;
0fb97abe
JF		 480}
481
482static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
483{
383d0b05 484 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
0fb97abe
JF		 485 int rc;
486
3f24ba15 487 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
0fb97abe
JF		 488 vcpu->stat.deliver_restart_signal++;
489 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
490
491 rc = write_guest_lc(vcpu,
c667aeac 492 offsetof(struct lowcore, restart_old_psw),
0fb97abe 493 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
c667aeac 494 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
0fb97abe 495 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
383d0b05 496 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
99e20009 497 return rc ? -EFAULT : 0;
0fb97abe
JF		 498}
499
383d0b05 500static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
0fb97abe 501{
383d0b05
JF		 502 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
503 struct kvm_s390_prefix_info prefix;
504
505 spin_lock(&li->lock);
506 prefix = li->irq.prefix;
507 li->irq.prefix.address = 0;
508 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
509 spin_unlock(&li->lock);
0fb97abe 510
0fb97abe
JF		 511 vcpu->stat.deliver_prefix_signal++;
512 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
513 KVM_S390_SIGP_SET_PREFIX,
383d0b05 514 prefix.address, 0);
0fb97abe 515
383d0b05 516 kvm_s390_set_prefix(vcpu, prefix.address);
0fb97abe
JF		 517 return 0;
518}
519
383d0b05 520static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
0fb97abe 521{
383d0b05 522 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
0fb97abe 523 int rc;
383d0b05
JF		 524 int cpu_addr;
525
526 spin_lock(&li->lock);
527 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
528 clear_bit(cpu_addr, li->sigp_emerg_pending);
529 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
530 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
531 spin_unlock(&li->lock);
0fb97abe 532
3f24ba15 533 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
0fb97abe 534 vcpu->stat.deliver_emergency_signal++;
383d0b05
JF		 535 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
536 cpu_addr, 0);
0fb97abe
JF		 537
538 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
539 (u16 *)__LC_EXT_INT_CODE);
383d0b05 540 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
0fb97abe
JF		 541 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
542 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
543 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
544 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
99e20009 545 return rc ? -EFAULT : 0;
0fb97abe
JF		 546}
547
383d0b05 548static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
0fb97abe 549{
383d0b05
JF		 550 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
551 struct kvm_s390_extcall_info extcall;
0fb97abe
JF		 552 int rc;
553
383d0b05
JF		 554 spin_lock(&li->lock);
555 extcall = li->irq.extcall;
556 li->irq.extcall.code = 0;
557 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
558 spin_unlock(&li->lock);
559
3f24ba15 560 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
0fb97abe
JF		 561 vcpu->stat.deliver_external_call++;
562 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
563 KVM_S390_INT_EXTERNAL_CALL,
383d0b05 564 extcall.code, 0);
0fb97abe
JF		 565
566 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
567 (u16 *)__LC_EXT_INT_CODE);
383d0b05 568 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
0fb97abe
JF		 569 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
570 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
571 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
572 sizeof(psw_t));
99e20009 573 return rc ? -EFAULT : 0;
0fb97abe
JF		 574}
575
383d0b05 576static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
8712836b 577{
383d0b05
JF		 578 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
579 struct kvm_s390_pgm_info pgm_info;
a9a846fd 580 int rc = 0, nullifying = false;
634790b8 581 u16 ilen;
8712836b 582
383d0b05
JF		 583 spin_lock(&li->lock);
584 pgm_info = li->irq.pgm;
585 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
586 memset(&li->irq.pgm, 0, sizeof(pgm_info));
587 spin_unlock(&li->lock);
588
634790b8 589 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
0e8bc06a
DH		 590 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
591 pgm_info.code, ilen);
0fb97abe
JF		 592 vcpu->stat.deliver_program_int++;
593 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
383d0b05 594 pgm_info.code, 0);
0fb97abe 595
383d0b05 596 switch (pgm_info.code & ~PGM_PER) {
8712836b
DH		 597 case PGM_AFX_TRANSLATION:
598 case PGM_ASX_TRANSLATION:
599 case PGM_EX_TRANSLATION:
600 case PGM_LFX_TRANSLATION:
601 case PGM_LSTE_SEQUENCE:
602 case PGM_LSX_TRANSLATION:
603 case PGM_LX_TRANSLATION:
604 case PGM_PRIMARY_AUTHORITY:
605 case PGM_SECONDARY_AUTHORITY:
a9a846fd
TH		 606 nullifying = true;
607 /* fall through */
8712836b 608 case PGM_SPACE_SWITCH:
383d0b05 609 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
8712836b
DH		 610 (u64 *)__LC_TRANS_EXC_CODE);
611 break;
612 case PGM_ALEN_TRANSLATION:
613 case PGM_ALE_SEQUENCE:
614 case PGM_ASTE_INSTANCE:
615 case PGM_ASTE_SEQUENCE:
616 case PGM_ASTE_VALIDITY:
617 case PGM_EXTENDED_AUTHORITY:
383d0b05 618 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
8712836b 619 (u8 *)__LC_EXC_ACCESS_ID);
a9a846fd 620 nullifying = true;
8712836b
DH		 621 break;
622 case PGM_ASCE_TYPE:
623 case PGM_PAGE_TRANSLATION:
624 case PGM_REGION_FIRST_TRANS:
625 case PGM_REGION_SECOND_TRANS:
626 case PGM_REGION_THIRD_TRANS:
627 case PGM_SEGMENT_TRANSLATION:
383d0b05 628 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
8712836b 629 (u64 *)__LC_TRANS_EXC_CODE);
383d0b05 630 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
8712836b 631 (u8 *)__LC_EXC_ACCESS_ID);
383d0b05 632 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
8712836b 633 (u8 *)__LC_OP_ACCESS_ID);
a9a846fd 634 nullifying = true;
8712836b
DH		 635 break;
636 case PGM_MONITOR:
383d0b05 637 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
a36c5393 638 (u16 *)__LC_MON_CLASS_NR);
383d0b05 639 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
8712836b
DH		 640 (u64 *)__LC_MON_CODE);
641 break;
403c8648 642 case PGM_VECTOR_PROCESSING:
8712836b 643 case PGM_DATA:
383d0b05 644 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
8712836b
DH		 645 (u32 *)__LC_DATA_EXC_CODE);
646 break;
647 case PGM_PROTECTION:
383d0b05 648 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
8712836b 649 (u64 *)__LC_TRANS_EXC_CODE);
383d0b05 650 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
8712836b
DH		 651 (u8 *)__LC_EXC_ACCESS_ID);
652 break;
a9a846fd
TH		 653 case PGM_STACK_FULL:
654 case PGM_STACK_EMPTY:
655 case PGM_STACK_SPECIFICATION:
656 case PGM_STACK_TYPE:
657 case PGM_STACK_OPERATION:
658 case PGM_TRACE_TABEL:
659 case PGM_CRYPTO_OPERATION:
660 nullifying = true;
661 break;
8712836b
DH		 662 }
663
383d0b05
JF		 664 if (pgm_info.code & PGM_PER) {
665 rc |= put_guest_lc(vcpu, pgm_info.per_code,
8712836b 666 (u8 *) __LC_PER_CODE);
383d0b05 667 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
8712836b 668 (u8 *)__LC_PER_ATMID);
383d0b05 669 rc |= put_guest_lc(vcpu, pgm_info.per_address,
8712836b 670 (u64 *) __LC_PER_ADDRESS);
383d0b05 671 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
8712836b
DH		 672 (u8 *) __LC_PER_ACCESS_ID);
673 }
674
eaa4f416 675 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
0e8bc06a 676 kvm_s390_rewind_psw(vcpu, ilen);
a9a846fd 677
0e8bc06a
DH		 678 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
679 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
2ba45968
DH		 680 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
681 (u64 *) __LC_LAST_BREAK);
383d0b05 682 rc |= put_guest_lc(vcpu, pgm_info.code,
8712836b
DH		 683 (u16 *)__LC_PGM_INT_CODE);
684 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
685 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
686 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
687 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
99e20009 688 return rc ? -EFAULT : 0;
0fb97abe
JF		 689}
690
6d3da241 691static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
0fb97abe 692{
6d3da241
JF		 693 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
694 struct kvm_s390_ext_info ext;
695 int rc = 0;
696
697 spin_lock(&fi->lock);
698 if (!(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
699 spin_unlock(&fi->lock);
700 return 0;
701 }
702 ext = fi->srv_signal;
703 memset(&fi->srv_signal, 0, sizeof(ext));
704 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
705 spin_unlock(&fi->lock);
0fb97abe 706
3f24ba15 707 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
6d3da241 708 ext.ext_params);
0fb97abe 709 vcpu->stat.deliver_service_signal++;
6d3da241
JF		 710 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
711 ext.ext_params, 0);
0fb97abe
JF		 712
713 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
467fc298 714 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
0fb97abe
JF		 715 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
716 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
717 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
718 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
6d3da241 719 rc |= put_guest_lc(vcpu, ext.ext_params,
0fb97abe 720 (u32 *)__LC_EXT_PARAMS);
6d3da241 721
99e20009 722 return rc ? -EFAULT : 0;
0fb97abe
JF		 723}
724
6d3da241 725static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
0fb97abe 726{
6d3da241
JF		 727 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
728 struct kvm_s390_interrupt_info *inti;
729 int rc = 0;
0fb97abe 730
6d3da241
JF		 731 spin_lock(&fi->lock);
732 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
733 struct kvm_s390_interrupt_info,
734 list);
735 if (inti) {
6d3da241
JF		 736 list_del(&inti->list);
737 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
738 }
739 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
740 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
741 spin_unlock(&fi->lock);
8712836b 742
6d3da241 743 if (inti) {
3f24ba15
CB		 744 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
745 KVM_S390_INT_PFAULT_DONE, 0,
746 inti->ext.ext_params2);
747 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
748 inti->ext.ext_params2);
749
6d3da241
JF		 750 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
751 (u16 *)__LC_EXT_INT_CODE);
752 rc |= put_guest_lc(vcpu, PFAULT_DONE,
753 (u16 *)__LC_EXT_CPU_ADDR);
754 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
755 &vcpu->arch.sie_block->gpsw,
756 sizeof(psw_t));
757 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
758 &vcpu->arch.sie_block->gpsw,
759 sizeof(psw_t));
760 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
761 (u64 *)__LC_EXT_PARAMS2);
762 kfree(inti);
763 }
99e20009 764 return rc ? -EFAULT : 0;
0fb97abe
JF		 765}
766
6d3da241 767static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
0fb97abe 768{
6d3da241
JF		 769 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
770 struct kvm_s390_interrupt_info *inti;
771 int rc = 0;
0fb97abe 772
6d3da241
JF		 773 spin_lock(&fi->lock);
774 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
775 struct kvm_s390_interrupt_info,
776 list);
777 if (inti) {
778 VCPU_EVENT(vcpu, 4,
3f24ba15 779 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
6d3da241
JF		 780 inti->ext.ext_params, inti->ext.ext_params2);
781 vcpu->stat.deliver_virtio_interrupt++;
782 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
783 inti->type,
784 inti->ext.ext_params,
785 inti->ext.ext_params2);
786 list_del(&inti->list);
787 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
788 }
789 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
790 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
791 spin_unlock(&fi->lock);
0fb97abe 792
6d3da241
JF		 793 if (inti) {
794 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
795 (u16 *)__LC_EXT_INT_CODE);
796 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
797 (u16 *)__LC_EXT_CPU_ADDR);
798 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
799 &vcpu->arch.sie_block->gpsw,
800 sizeof(psw_t));
801 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
802 &vcpu->arch.sie_block->gpsw,
803 sizeof(psw_t));
804 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
805 (u32 *)__LC_EXT_PARAMS);
806 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
807 (u64 *)__LC_EXT_PARAMS2);
808 kfree(inti);
809 }
99e20009 810 return rc ? -EFAULT : 0;
0fb97abe
JF		 811}
812
813static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
6d3da241 814 unsigned long irq_type)
0fb97abe 815{
6d3da241
JF		 816 struct list_head *isc_list;
817 struct kvm_s390_float_interrupt *fi;
818 struct kvm_s390_interrupt_info *inti = NULL;
819 int rc = 0;
0fb97abe 820
6d3da241 821 fi = &vcpu->kvm->arch.float_int;
8712836b 822
6d3da241
JF		 823 spin_lock(&fi->lock);
824 isc_list = &fi->lists[irq_type - IRQ_PEND_IO_ISC_0];
825 inti = list_first_entry_or_null(isc_list,
826 struct kvm_s390_interrupt_info,
827 list);
828 if (inti) {
dcc98ea6
CB		 829 if (inti->type & KVM_S390_INT_IO_AI_MASK)
830 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
831 else
832 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
833 inti->io.subchannel_id >> 8,
834 inti->io.subchannel_id >> 1 & 0x3,
835 inti->io.subchannel_nr);
836
6d3da241
JF		 837 vcpu->stat.deliver_io_int++;
838 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
839 inti->type,
840 ((__u32)inti->io.subchannel_id << 16) |
841 inti->io.subchannel_nr,
842 ((__u64)inti->io.io_int_parm << 32) |
843 inti->io.io_int_word);
844 list_del(&inti->list);
845 fi->counters[FIRQ_CNTR_IO] -= 1;
846 }
847 if (list_empty(isc_list))
848 clear_bit(irq_type, &fi->pending_irqs);
849 spin_unlock(&fi->lock);
850
851 if (inti) {
852 rc = put_guest_lc(vcpu, inti->io.subchannel_id,
853 (u16 *)__LC_SUBCHANNEL_ID);
854 rc |= put_guest_lc(vcpu, inti->io.subchannel_nr,
855 (u16 *)__LC_SUBCHANNEL_NR);
856 rc |= put_guest_lc(vcpu, inti->io.io_int_parm,
857 (u32 *)__LC_IO_INT_PARM);
858 rc |= put_guest_lc(vcpu, inti->io.io_int_word,
859 (u32 *)__LC_IO_INT_WORD);
860 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
861 &vcpu->arch.sie_block->gpsw,
862 sizeof(psw_t));
863 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
864 &vcpu->arch.sie_block->gpsw,
865 sizeof(psw_t));
866 kfree(inti);
867 }
383d0b05 868
99e20009 869 return rc ? -EFAULT : 0;
383d0b05
JF		 870}
871
872typedef int (*deliver_irq_t)(struct kvm_vcpu *vcpu);
873
874static const deliver_irq_t deliver_irq_funcs[] = {
875 [IRQ_PEND_MCHK_EX] = __deliver_machine_check,
6d3da241 876 [IRQ_PEND_MCHK_REP] = __deliver_machine_check,
383d0b05
JF		 877 [IRQ_PEND_PROG] = __deliver_prog,
878 [IRQ_PEND_EXT_EMERGENCY] = __deliver_emergency_signal,
879 [IRQ_PEND_EXT_EXTERNAL] = __deliver_external_call,
880 [IRQ_PEND_EXT_CLOCK_COMP] = __deliver_ckc,
881 [IRQ_PEND_EXT_CPU_TIMER] = __deliver_cpu_timer,
882 [IRQ_PEND_RESTART] = __deliver_restart,
383d0b05
JF		 883 [IRQ_PEND_SET_PREFIX] = __deliver_set_prefix,
884 [IRQ_PEND_PFAULT_INIT] = __deliver_pfault_init,
6d3da241
JF		 885 [IRQ_PEND_EXT_SERVICE] = __deliver_service,
886 [IRQ_PEND_PFAULT_DONE] = __deliver_pfault_done,
887 [IRQ_PEND_VIRTIO] = __deliver_virtio,
383d0b05
JF		 888};
889
ea5f4969
DH		 890/* Check whether an external call is pending (deliverable or not) */
891int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
4953919f 892{
ea5f4969 893 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
4953919f 894
37c5f6c8 895 if (!sclp.has_sigpif)
ea5f4969 896 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
4953919f 897
a5bd7647 898 return sca_ext_call_pending(vcpu, NULL);
4953919f
DH		 899}
900
9a022067 901int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
ba5c1e9b 902{
4d32ad6b
DH		 903 if (deliverable_irqs(vcpu))
904 return 1;
ba5c1e9b 905
4d32ad6b
DH		 906 if (kvm_cpu_has_pending_timer(vcpu))
907 return 1;
ba5c1e9b 908
ea5f4969 909 /* external call pending and deliverable */
4d32ad6b 910 if (kvm_s390_ext_call_pending(vcpu) &&
ea5f4969
DH		 911 !psw_extint_disabled(vcpu) &&
912 (vcpu->arch.sie_block->gcr[0] & 0x2000ul))
4d32ad6b 913 return 1;
4953919f 914
4d32ad6b
DH		 915 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
916 return 1;
917 return 0;
ba5c1e9b
CO		 918}
919
3d80840d
MT		 920int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
921{
b4aec925 922 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
3d80840d
MT		 923}
924
b3c17f10
DH		 925static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
926{
927 u64 now, cputm, sltime = 0;
928
929 if (ckc_interrupts_enabled(vcpu)) {
930 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
931 sltime = tod_to_ns(vcpu->arch.sie_block->ckc - now);
932 /* already expired or overflow? */
933 if (!sltime || vcpu->arch.sie_block->ckc <= now)
934 return 0;
935 if (cpu_timer_interrupts_enabled(vcpu)) {
936 cputm = kvm_s390_get_cpu_timer(vcpu);
937 /* already expired? */
938 if (cputm >> 63)
939 return 0;
940 return min(sltime, tod_to_ns(cputm));
941 }
942 } else if (cpu_timer_interrupts_enabled(vcpu)) {
943 sltime = kvm_s390_get_cpu_timer(vcpu);
944 /* already expired? */
945 if (sltime >> 63)
946 return 0;
947 }
948 return sltime;
949}
950
ba5c1e9b
CO		 951int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
952{
b3c17f10 953 u64 sltime;
ba5c1e9b
CO		 954
955 vcpu->stat.exit_wait_state++;
ba5c1e9b 956
0759d068 957 /* fast path */
118b862b 958 if (kvm_arch_vcpu_runnable(vcpu))
0759d068 959 return 0;
e52b2af5 960
ba5c1e9b
CO		 961 if (psw_interrupts_disabled(vcpu)) {
962 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
b8e660b8 963 return -EOPNOTSUPP; /* disabled wait */
ba5c1e9b
CO		 964 }
965
b3c17f10
DH		 966 if (!ckc_interrupts_enabled(vcpu) &&
967 !cpu_timer_interrupts_enabled(vcpu)) {
ba5c1e9b 968 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
bda343ef 969 __set_cpu_idle(vcpu);
ba5c1e9b
CO		 970 goto no_timer;
971 }
972
b3c17f10
DH		 973 sltime = __calculate_sltime(vcpu);
974 if (!sltime)
bda343ef
DH		 975 return 0;
976
977 __set_cpu_idle(vcpu);
ca872302 978 hrtimer_start(&vcpu->arch.ckc_timer, ktime_set (0, sltime) , HRTIMER_MODE_REL);
b3c17f10 979 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
ba5c1e9b 980no_timer:
800c1065 981 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
0759d068 982 kvm_vcpu_block(vcpu);
ba5c1e9b 983 __unset_cpu_idle(vcpu);
800c1065
TH		 984 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
985
2d00f759 986 hrtimer_cancel(&vcpu->arch.ckc_timer);
ba5c1e9b
CO		 987 return 0;
988}
989
0e9c85a5
DH		 990void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
991{
3491caf2
CB		 992 /*
993 * We cannot move this into the if, as the CPU might be already
994 * in kvm_vcpu_block without having the waitqueue set (polling)
995 */
996 vcpu->valid_wakeup = true;
8577370f 997 if (swait_active(&vcpu->wq)) {
0e9c85a5
DH		 998 /*
999 * The vcpu gave up the cpu voluntarily, mark it as a good
1000 * yield-candidate.
1001 */
1002 vcpu->preempted = true;
8577370f 1003 swake_up(&vcpu->wq);
ce2e4f0b 1004 vcpu->stat.halt_wakeup++;
0e9c85a5 1005 }
adbf1698
DH		 1006 /*
1007 * The VCPU might not be sleeping but is executing the VSIE. Let's
1008 * kick it, so it leaves the SIE to process the request.
1009 */
1010 kvm_s390_vsie_kick(vcpu);
0e9c85a5
DH		 1011}
1012
ca872302
CB		 1013enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1014{
1015 struct kvm_vcpu *vcpu;
b3c17f10 1016 u64 sltime;
ca872302
CB		 1017
1018 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
b3c17f10 1019 sltime = __calculate_sltime(vcpu);
ca872302 1020
2d00f759
DH		 1021 /*
1022 * If the monotonic clock runs faster than the tod clock we might be
1023 * woken up too early and have to go back to sleep to avoid deadlocks.
1024 */
b3c17f10 1025 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
2d00f759
DH		 1026 return HRTIMER_RESTART;
1027 kvm_s390_vcpu_wakeup(vcpu);
ca872302
CB		 1028 return HRTIMER_NORESTART;
1029}
ba5c1e9b 1030
2ed10cc1
JF		 1031void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1032{
1033 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2ed10cc1 1034
4ae3c081 1035 spin_lock(&li->lock);
383d0b05
JF		 1036 li->pending_irqs = 0;
1037 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1038 memset(&li->irq, 0, sizeof(li->irq));
4ae3c081 1039 spin_unlock(&li->lock);
4953919f 1040
a5bd7647 1041 sca_clear_ext_call(vcpu);
2ed10cc1
JF		 1042}
1043
614aeab4 1044int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
ba5c1e9b 1045{
180c12fb 1046 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
383d0b05 1047 deliver_irq_t func;
79395031 1048 int rc = 0;
383d0b05 1049 unsigned long irq_type;
6d3da241 1050 unsigned long irqs;
ba5c1e9b
CO		 1051
1052 __reset_intercept_indicators(vcpu);
ba5c1e9b 1053
383d0b05
JF		 1054 /* pending ckc conditions might have been invalidated */
1055 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
b4aec925 1056 if (ckc_irq_pending(vcpu))
383d0b05
JF		 1057 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1058
b4aec925
DH		 1059 /* pending cpu timer conditions might have been invalidated */
1060 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1061 if (cpu_timer_irq_pending(vcpu))
1062 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1063
ffeca0ae 1064 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
383d0b05 1065 /* bits are in the order of interrupt priority */
6d3da241 1066 irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
6d3da241
JF		 1067 if (is_ioirq(irq_type)) {
1068 rc = __deliver_io(vcpu, irq_type);
1069 } else {
1070 func = deliver_irq_funcs[irq_type];
1071 if (!func) {
1072 WARN_ON_ONCE(func == NULL);
1073 clear_bit(irq_type, &li->pending_irqs);
1074 continue;
1075 }
1076 rc = func(vcpu);
383d0b05 1077 }
ffeca0ae 1078 }
383d0b05 1079
6d3da241 1080 set_intercept_indicators(vcpu);
79395031
JF		 1081
1082 return rc;
ba5c1e9b
CO		 1083}
1084
383d0b05 1085static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
0146a7b0
JF		 1086{
1087 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1088
ed2afcfa
DH		 1089 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1090 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1091 irq->u.pgm.code, 0);
1092
634790b8
DH		 1093 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1094 /* auto detection if no valid ILC was given */
1095 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1096 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1097 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1098 }
1099
238293b1
DH		 1100 if (irq->u.pgm.code == PGM_PER) {
1101 li->irq.pgm.code |= PGM_PER;
634790b8 1102 li->irq.pgm.flags = irq->u.pgm.flags;
238293b1
DH		 1103 /* only modify PER related information */
1104 li->irq.pgm.per_address = irq->u.pgm.per_address;
1105 li->irq.pgm.per_code = irq->u.pgm.per_code;
1106 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1107 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1108 } else if (!(irq->u.pgm.code & PGM_PER)) {
1109 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1110 irq->u.pgm.code;
634790b8 1111 li->irq.pgm.flags = irq->u.pgm.flags;
238293b1
DH		 1112 /* only modify non-PER information */
1113 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1114 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1115 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1116 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1117 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1118 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1119 } else {
1120 li->irq.pgm = irq->u.pgm;
1121 }
9185124e 1122 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
0146a7b0
JF		 1123 return 0;
1124}
1125
383d0b05 1126static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
0146a7b0
JF		 1127{
1128 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1129
3f24ba15
CB		 1130 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1131 irq->u.ext.ext_params2);
383d0b05
JF		 1132 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1133 irq->u.ext.ext_params,
ed2afcfa 1134 irq->u.ext.ext_params2);
383d0b05
JF		 1135
1136 li->irq.ext = irq->u.ext;
1137 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
805de8f4 1138 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
0146a7b0
JF		 1139 return 0;
1140}
1141
0675d92d 1142static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
0146a7b0
JF		 1143{
1144 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
383d0b05 1145 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
ea5f4969 1146 uint16_t src_id = irq->u.extcall.code;
0146a7b0 1147
3f24ba15 1148 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
ea5f4969 1149 src_id);
383d0b05 1150 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
ed2afcfa 1151 src_id, 0);
ea5f4969
DH		 1152
1153 /* sending vcpu invalid */
152e9f65 1154 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
ea5f4969
DH		 1155 return -EINVAL;
1156
37c5f6c8 1157 if (sclp.has_sigpif)
a5bd7647 1158 return sca_inject_ext_call(vcpu, src_id);
383d0b05 1159
b938eace 1160 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
ea5f4969 1161 return -EBUSY;
383d0b05 1162 *extcall = irq->u.extcall;
805de8f4 1163 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
0146a7b0
JF		 1164 return 0;
1165}
1166
383d0b05 1167static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
0146a7b0
JF		 1168{
1169 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
383d0b05 1170 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
0146a7b0 1171
ed2afcfa 1172 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
556cc0da 1173 irq->u.prefix.address);
383d0b05 1174 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
ed2afcfa 1175 irq->u.prefix.address, 0);
383d0b05 1176
a3a9c59a
DH		 1177 if (!is_vcpu_stopped(vcpu))
1178 return -EBUSY;
1179
383d0b05
JF		 1180 *prefix = irq->u.prefix;
1181 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
0146a7b0
JF		 1182 return 0;
1183}
1184
6cddd432 1185#define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
383d0b05 1186static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
0146a7b0
JF		 1187{
1188 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2822545f 1189 struct kvm_s390_stop_info *stop = &li->irq.stop;
6cddd432 1190 int rc = 0;
0146a7b0 1191
ed2afcfa 1192 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
383d0b05 1193
2822545f
DH		 1194 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1195 return -EINVAL;
1196
6cddd432
DH		 1197 if (is_vcpu_stopped(vcpu)) {
1198 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1199 rc = kvm_s390_store_status_unloaded(vcpu,
1200 KVM_S390_STORE_STATUS_NOADDR);
1201 return rc;
1202 }
1203
1204 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1205 return -EBUSY;
2822545f 1206 stop->flags = irq->u.stop.flags;
6cddd432 1207 __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
0146a7b0
JF		 1208 return 0;
1209}
1210
1211static int __inject_sigp_restart(struct kvm_vcpu *vcpu,
383d0b05 1212 struct kvm_s390_irq *irq)
0146a7b0
JF		 1213{
1214 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1215
3f24ba15 1216 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
ed2afcfa 1217 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
383d0b05
JF		 1218
1219 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
0146a7b0
JF		 1220 return 0;
1221}
1222
1223static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
383d0b05 1224 struct kvm_s390_irq *irq)
0146a7b0
JF		 1225{
1226 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1227
3f24ba15 1228 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
383d0b05
JF		 1229 irq->u.emerg.code);
1230 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
ed2afcfa 1231 irq->u.emerg.code, 0);
383d0b05 1232
b85de33a
DH		 1233 /* sending vcpu invalid */
1234 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1235 return -EINVAL;
1236
49538d12 1237 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
383d0b05 1238 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
805de8f4 1239 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
0146a7b0
JF		 1240 return 0;
1241}
1242
383d0b05 1243static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
0146a7b0
JF		 1244{
1245 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
383d0b05 1246 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
0146a7b0 1247
3f24ba15 1248 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
556cc0da 1249 irq->u.mchk.mcic);
383d0b05 1250 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
ed2afcfa 1251 irq->u.mchk.mcic);
383d0b05
JF		 1252
1253 /*
fc2020cf
JF		 1254 * Because repressible machine checks can be indicated along with
1255 * exigent machine checks (PoP, Chapter 11, Interruption action)
1256 * we need to combine cr14, mcic and external damage code.
1257 * Failing storage address and the logout area should not be or'ed
1258 * together, we just indicate the last occurrence of the corresponding
1259 * machine check
383d0b05 1260 */
fc2020cf 1261 mchk->cr14 |= irq->u.mchk.cr14;
383d0b05 1262 mchk->mcic |= irq->u.mchk.mcic;
fc2020cf
JF		 1263 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1264 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1265 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1266 sizeof(mchk->fixed_logout));
383d0b05
JF		 1267 if (mchk->mcic & MCHK_EX_MASK)
1268 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1269 else if (mchk->mcic & MCHK_REP_MASK)
1270 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
0146a7b0
JF		 1271 return 0;
1272}
1273
383d0b05 1274static int __inject_ckc(struct kvm_vcpu *vcpu)
0146a7b0
JF		 1275{
1276 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1277
3f24ba15 1278 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
383d0b05 1279 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
ed2afcfa 1280 0, 0);
383d0b05
JF		 1281
1282 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
805de8f4 1283 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
0146a7b0
JF		 1284 return 0;
1285}
1286
383d0b05 1287static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
0146a7b0
JF		 1288{
1289 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1290
3f24ba15 1291 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
383d0b05 1292 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
ed2afcfa 1293 0, 0);
383d0b05
JF		 1294
1295 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
805de8f4 1296 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
ba5c1e9b
CO		 1297 return 0;
1298}
1299
6d3da241
JF		 1300static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1301 int isc, u32 schid)
1302{
1303 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1304 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1305 struct kvm_s390_interrupt_info *iter;
1306 u16 id = (schid & 0xffff0000U) >> 16;
1307 u16 nr = schid & 0x0000ffffU;
1308
1309 spin_lock(&fi->lock);
1310 list_for_each_entry(iter, isc_list, list) {
1311 if (schid && (id != iter->io.subchannel_id ||
1312 nr != iter->io.subchannel_nr))
1313 continue;
1314 /* found an appropriate entry */
1315 list_del_init(&iter->list);
1316 fi->counters[FIRQ_CNTR_IO] -= 1;
1317 if (list_empty(isc_list))
1318 clear_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
1319 spin_unlock(&fi->lock);
1320 return iter;
1321 }
1322 spin_unlock(&fi->lock);
1323 return NULL;
1324}
383d0b05 1325
6d3da241
JF		 1326/*
1327 * Dequeue and return an I/O interrupt matching any of the interruption
1328 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1329 */
fa6b7fe9 1330struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
6d3da241
JF		 1331 u64 isc_mask, u32 schid)
1332{
1333 struct kvm_s390_interrupt_info *inti = NULL;
1334 int isc;
1335
1336 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1337 if (isc_mask & isc_to_isc_bits(isc))
1338 inti = get_io_int(kvm, isc, schid);
1339 }
1340 return inti;
1341}
1342
1343#define SCCB_MASK 0xFFFFFFF8
1344#define SCCB_EVENT_PENDING 0x3
1345
1346static int __inject_service(struct kvm *kvm,
1347 struct kvm_s390_interrupt_info *inti)
1348{
1349 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1350
1351 spin_lock(&fi->lock);
1352 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1353 /*
1354 * Early versions of the QEMU s390 bios will inject several
1355 * service interrupts after another without handling a
1356 * condition code indicating busy.
1357 * We will silently ignore those superfluous sccb values.
1358 * A future version of QEMU will take care of serialization
1359 * of servc requests
1360 */
1361 if (fi->srv_signal.ext_params & SCCB_MASK)
1362 goto out;
1363 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1364 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1365out:
1366 spin_unlock(&fi->lock);
1367 kfree(inti);
1368 return 0;
1369}
1370
1371static int __inject_virtio(struct kvm *kvm,
1372 struct kvm_s390_interrupt_info *inti)
1373{
1374 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1375
1376 spin_lock(&fi->lock);
1377 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1378 spin_unlock(&fi->lock);
1379 return -EBUSY;
1380 }
1381 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1382 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1383 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1384 spin_unlock(&fi->lock);
1385 return 0;
1386}
1387
1388static int __inject_pfault_done(struct kvm *kvm,
1389 struct kvm_s390_interrupt_info *inti)
1390{
1391 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1392
1393 spin_lock(&fi->lock);
1394 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1395 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1396 spin_unlock(&fi->lock);
1397 return -EBUSY;
1398 }
1399 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1400 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1401 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1402 spin_unlock(&fi->lock);
1403 return 0;
1404}
1405
1406#define CR_PENDING_SUBCLASS 28
1407static int __inject_float_mchk(struct kvm *kvm,
1408 struct kvm_s390_interrupt_info *inti)
1409{
1410 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1411
1412 spin_lock(&fi->lock);
1413 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1414 fi->mchk.mcic |= inti->mchk.mcic;
1415 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1416 spin_unlock(&fi->lock);
1417 kfree(inti);
1418 return 0;
1419}
1420
1421static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
fa6b7fe9
CH		 1422{
1423 struct kvm_s390_float_interrupt *fi;
6d3da241
JF		 1424 struct list_head *list;
1425 int isc;
fa6b7fe9 1426
fa6b7fe9
CH		 1427 fi = &kvm->arch.float_int;
1428 spin_lock(&fi->lock);
6d3da241
JF		 1429 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1430 spin_unlock(&fi->lock);
1431 return -EBUSY;
a91b8ebe 1432 }
6d3da241
JF		 1433 fi->counters[FIRQ_CNTR_IO] += 1;
1434
dcc98ea6
CB		 1435 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1436 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1437 else
1438 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1439 inti->io.subchannel_id >> 8,
1440 inti->io.subchannel_id >> 1 & 0x3,
1441 inti->io.subchannel_nr);
6d3da241
JF		 1442 isc = int_word_to_isc(inti->io.io_int_word);
1443 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1444 list_add_tail(&inti->list, list);
1445 set_bit(IRQ_PEND_IO_ISC_0 + isc, &fi->pending_irqs);
fa6b7fe9 1446 spin_unlock(&fi->lock);
6d3da241 1447 return 0;
fa6b7fe9 1448}
ba5c1e9b 1449
96e0ed23
DH		 1450/*
1451 * Find a destination VCPU for a floating irq and kick it.
1452 */
1453static void __floating_irq_kick(struct kvm *kvm, u64 type)
ba5c1e9b 1454{
96e0ed23 1455 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
180c12fb 1456 struct kvm_s390_local_interrupt *li;
96e0ed23
DH		 1457 struct kvm_vcpu *dst_vcpu;
1458 int sigcpu, online_vcpus, nr_tries = 0;
1459
1460 online_vcpus = atomic_read(&kvm->online_vcpus);
1461 if (!online_vcpus)
1462 return;
1463
1464 /* find idle VCPUs first, then round robin */
1465 sigcpu = find_first_bit(fi->idle_mask, online_vcpus);
1466 if (sigcpu == online_vcpus) {
1467 do {
1468 sigcpu = fi->next_rr_cpu;
1469 fi->next_rr_cpu = (fi->next_rr_cpu + 1) % online_vcpus;
1470 /* avoid endless loops if all vcpus are stopped */
1471 if (nr_tries++ >= online_vcpus)
1472 return;
1473 } while (is_vcpu_stopped(kvm_get_vcpu(kvm, sigcpu)));
1474 }
1475 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1476
1477 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1478 li = &dst_vcpu->arch.local_int;
1479 spin_lock(&li->lock);
1480 switch (type) {
1481 case KVM_S390_MCHK:
805de8f4 1482 atomic_or(CPUSTAT_STOP_INT, li->cpuflags);
96e0ed23
DH		 1483 break;
1484 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
805de8f4 1485 atomic_or(CPUSTAT_IO_INT, li->cpuflags);
96e0ed23
DH		 1486 break;
1487 default:
805de8f4 1488 atomic_or(CPUSTAT_EXT_INT, li->cpuflags);
96e0ed23
DH		 1489 break;
1490 }
1491 spin_unlock(&li->lock);
1492 kvm_s390_vcpu_wakeup(dst_vcpu);
1493}
1494
1495static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1496{
6d3da241
JF		 1497 u64 type = READ_ONCE(inti->type);
1498 int rc;
ba5c1e9b 1499
6d3da241
JF		 1500 switch (type) {
1501 case KVM_S390_MCHK:
1502 rc = __inject_float_mchk(kvm, inti);
1503 break;
1504 case KVM_S390_INT_VIRTIO:
1505 rc = __inject_virtio(kvm, inti);
1506 break;
1507 case KVM_S390_INT_SERVICE:
1508 rc = __inject_service(kvm, inti);
1509 break;
1510 case KVM_S390_INT_PFAULT_DONE:
1511 rc = __inject_pfault_done(kvm, inti);
1512 break;
1513 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1514 rc = __inject_io(kvm, inti);
1515 break;
1516 default:
a91b8ebe 1517 rc = -EINVAL;
c05c4186 1518 }
6d3da241
JF		 1519 if (rc)
1520 return rc;
1521
96e0ed23 1522 __floating_irq_kick(kvm, type);
6d3da241 1523 return 0;
c05c4186
JF		 1524}
1525
1526int kvm_s390_inject_vm(struct kvm *kvm,
1527 struct kvm_s390_interrupt *s390int)
1528{
1529 struct kvm_s390_interrupt_info *inti;
428d53be 1530 int rc;
c05c4186 1531
ba5c1e9b
CO		 1532 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1533 if (!inti)
1534 return -ENOMEM;
1535
c05c4186
JF		 1536 inti->type = s390int->type;
1537 switch (inti->type) {
ba5c1e9b 1538 case KVM_S390_INT_VIRTIO:
33e19115 1539 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
ba5c1e9b 1540 s390int->parm, s390int->parm64);
ba5c1e9b
CO		 1541 inti->ext.ext_params = s390int->parm;
1542 inti->ext.ext_params2 = s390int->parm64;
1543 break;
1544 case KVM_S390_INT_SERVICE:
3f24ba15 1545 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
ba5c1e9b
CO		 1546 inti->ext.ext_params = s390int->parm;
1547 break;
3c038e6b 1548 case KVM_S390_INT_PFAULT_DONE:
3c038e6b
DD		 1549 inti->ext.ext_params2 = s390int->parm64;
1550 break;
48a3e950 1551 case KVM_S390_MCHK:
3f24ba15 1552 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
48a3e950 1553 s390int->parm64);
48a3e950
CH		 1554 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
1555 inti->mchk.mcic = s390int->parm64;
1556 break;
d8346b7d 1557 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
d8346b7d
CH		 1558 inti->io.subchannel_id = s390int->parm >> 16;
1559 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
1560 inti->io.io_int_parm = s390int->parm64 >> 32;
1561 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
1562 break;
ba5c1e9b
CO		 1563 default:
1564 kfree(inti);
1565 return -EINVAL;
1566 }
ade38c31
CH		 1567 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
1568 2);
ba5c1e9b 1569
428d53be
DH		 1570 rc = __inject_vm(kvm, inti);
1571 if (rc)
1572 kfree(inti);
1573 return rc;
ba5c1e9b
CO		 1574}
1575
15462e37 1576int kvm_s390_reinject_io_int(struct kvm *kvm,
2f32d4ea
CH		 1577 struct kvm_s390_interrupt_info *inti)
1578{
15462e37 1579 return __inject_vm(kvm, inti);
2f32d4ea
CH		 1580}
1581
383d0b05
JF		 1582int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
1583 struct kvm_s390_irq *irq)
1584{
1585 irq->type = s390int->type;
1586 switch (irq->type) {
1587 case KVM_S390_PROGRAM_INT:
1588 if (s390int->parm & 0xffff0000)
1589 return -EINVAL;
1590 irq->u.pgm.code = s390int->parm;
1591 break;
1592 case KVM_S390_SIGP_SET_PREFIX:
1593 irq->u.prefix.address = s390int->parm;
1594 break;
2822545f
DH		 1595 case KVM_S390_SIGP_STOP:
1596 irq->u.stop.flags = s390int->parm;
1597 break;
383d0b05 1598 case KVM_S390_INT_EXTERNAL_CALL:
94d1f564 1599 if (s390int->parm & 0xffff0000)
383d0b05
JF		 1600 return -EINVAL;
1601 irq->u.extcall.code = s390int->parm;
1602 break;
1603 case KVM_S390_INT_EMERGENCY:
94d1f564 1604 if (s390int->parm & 0xffff0000)
383d0b05
JF		 1605 return -EINVAL;
1606 irq->u.emerg.code = s390int->parm;
1607 break;
1608 case KVM_S390_MCHK:
1609 irq->u.mchk.mcic = s390int->parm64;
1610 break;
1611 }
1612 return 0;
1613}
1614
6cddd432
DH		 1615int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
1616{
1617 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1618
1619 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1620}
1621
1622void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
1623{
1624 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1625
1626 spin_lock(&li->lock);
1627 li->irq.stop.flags = 0;
1628 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
1629 spin_unlock(&li->lock);
1630}
1631
79e87a10 1632static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
ba5c1e9b 1633{
0146a7b0 1634 int rc;
ba5c1e9b 1635
383d0b05 1636 switch (irq->type) {
ba5c1e9b 1637 case KVM_S390_PROGRAM_INT:
383d0b05 1638 rc = __inject_prog(vcpu, irq);
ba5c1e9b 1639 break;
b7e6e4d3 1640 case KVM_S390_SIGP_SET_PREFIX:
383d0b05 1641 rc = __inject_set_prefix(vcpu, irq);
b7e6e4d3 1642 break;
ba5c1e9b 1643 case KVM_S390_SIGP_STOP:
383d0b05 1644 rc = __inject_sigp_stop(vcpu, irq);
0146a7b0 1645 break;
ba5c1e9b 1646 case KVM_S390_RESTART:
383d0b05 1647 rc = __inject_sigp_restart(vcpu, irq);
0146a7b0 1648 break;
e029ae5b 1649 case KVM_S390_INT_CLOCK_COMP:
383d0b05 1650 rc = __inject_ckc(vcpu);
0146a7b0 1651 break;
e029ae5b 1652 case KVM_S390_INT_CPU_TIMER:
383d0b05 1653 rc = __inject_cpu_timer(vcpu);
82a12737 1654 break;
7697e71f 1655 case KVM_S390_INT_EXTERNAL_CALL:
383d0b05 1656 rc = __inject_extcall(vcpu, irq);
82a12737 1657 break;
ba5c1e9b 1658 case KVM_S390_INT_EMERGENCY:
383d0b05 1659 rc = __inject_sigp_emergency(vcpu, irq);
ba5c1e9b 1660 break;
48a3e950 1661 case KVM_S390_MCHK:
383d0b05 1662 rc = __inject_mchk(vcpu, irq);
48a3e950 1663 break;
3c038e6b 1664 case KVM_S390_INT_PFAULT_INIT:
383d0b05 1665 rc = __inject_pfault_init(vcpu, irq);
3c038e6b 1666 break;
ba5c1e9b
CO		 1667 case KVM_S390_INT_VIRTIO:
1668 case KVM_S390_INT_SERVICE:
d8346b7d 1669 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
ba5c1e9b 1670 default:
0146a7b0 1671 rc = -EINVAL;
ba5c1e9b 1672 }
79e87a10
JF		 1673
1674 return rc;
1675}
1676
1677int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1678{
1679 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1680 int rc;
1681
1682 spin_lock(&li->lock);
1683 rc = do_inject_vcpu(vcpu, irq);
4ae3c081 1684 spin_unlock(&li->lock);
0146a7b0
JF		 1685 if (!rc)
1686 kvm_s390_vcpu_wakeup(vcpu);
0146a7b0 1687 return rc;
ba5c1e9b 1688}
c05c4186 1689
6d3da241 1690static inline void clear_irq_list(struct list_head *_list)
c05c4186 1691{
6d3da241 1692 struct kvm_s390_interrupt_info *inti, *n;
c05c4186 1693
6d3da241 1694 list_for_each_entry_safe(inti, n, _list, list) {
c05c4186
JF		 1695 list_del(&inti->list);
1696 kfree(inti);
1697 }
c05c4186
JF		 1698}
1699
94aa033e
JF		 1700static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
1701 struct kvm_s390_irq *irq)
c05c4186 1702{
94aa033e 1703 irq->type = inti->type;
c05c4186 1704 switch (inti->type) {
3c038e6b
DD		 1705 case KVM_S390_INT_PFAULT_INIT:
1706 case KVM_S390_INT_PFAULT_DONE:
c05c4186 1707 case KVM_S390_INT_VIRTIO:
94aa033e 1708 irq->u.ext = inti->ext;
c05c4186
JF		 1709 break;
1710 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
94aa033e 1711 irq->u.io = inti->io;
c05c4186 1712 break;
c05c4186 1713 }
c05c4186
JF		 1714}
1715
6d3da241
JF		 1716void kvm_s390_clear_float_irqs(struct kvm *kvm)
1717{
1718 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1719 int i;
1720
1721 spin_lock(&fi->lock);
f2ae45ed
JF		 1722 fi->pending_irqs = 0;
1723 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
1724 memset(&fi->mchk, 0, sizeof(fi->mchk));
6d3da241
JF		 1725 for (i = 0; i < FIRQ_LIST_COUNT; i++)
1726 clear_irq_list(&fi->lists[i]);
1727 for (i = 0; i < FIRQ_MAX_COUNT; i++)
1728 fi->counters[i] = 0;
1729 spin_unlock(&fi->lock);
1730};
1731
94aa033e 1732static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
c05c4186
JF		 1733{
1734 struct kvm_s390_interrupt_info *inti;
1735 struct kvm_s390_float_interrupt *fi;
94aa033e 1736 struct kvm_s390_irq *buf;
6d3da241 1737 struct kvm_s390_irq *irq;
94aa033e 1738 int max_irqs;
c05c4186
JF		 1739 int ret = 0;
1740 int n = 0;
6d3da241 1741 int i;
c05c4186 1742
94aa033e
JF		 1743 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
1744 return -EINVAL;
1745
1746 /*
1747 * We are already using -ENOMEM to signal
1748 * userspace it may retry with a bigger buffer,
1749 * so we need to use something else for this case
1750 */
1751 buf = vzalloc(len);
1752 if (!buf)
1753 return -ENOBUFS;
1754
1755 max_irqs = len / sizeof(struct kvm_s390_irq);
1756
c05c4186
JF		 1757 fi = &kvm->arch.float_int;
1758 spin_lock(&fi->lock);
6d3da241
JF		 1759 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
1760 list_for_each_entry(inti, &fi->lists[i], list) {
1761 if (n == max_irqs) {
1762 /* signal userspace to try again */
1763 ret = -ENOMEM;
1764 goto out;
1765 }
1766 inti_to_irq(inti, &buf[n]);
1767 n++;
1768 }
1769 }
1770 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs)) {
94aa033e 1771 if (n == max_irqs) {
c05c4186
JF		 1772 /* signal userspace to try again */
1773 ret = -ENOMEM;
6d3da241 1774 goto out;
c05c4186 1775 }
6d3da241
JF		 1776 irq = (struct kvm_s390_irq *) &buf[n];
1777 irq->type = KVM_S390_INT_SERVICE;
1778 irq->u.ext = fi->srv_signal;
c05c4186
JF		 1779 n++;
1780 }
6d3da241
JF		 1781 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
1782 if (n == max_irqs) {
1783 /* signal userspace to try again */
1784 ret = -ENOMEM;
1785 goto out;
1786 }
1787 irq = (struct kvm_s390_irq *) &buf[n];
1788 irq->type = KVM_S390_MCHK;
1789 irq->u.mchk = fi->mchk;
1790 n++;
1791}
1792
1793out:
c05c4186 1794 spin_unlock(&fi->lock);
94aa033e
JF		 1795 if (!ret && n > 0) {
1796 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
1797 ret = -EFAULT;
1798 }
1799 vfree(buf);
c05c4186
JF		 1800
1801 return ret < 0 ? ret : n;
1802}
1803
1804static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
1805{
1806 int r;
1807
1808 switch (attr->group) {
1809 case KVM_DEV_FLIC_GET_ALL_IRQS:
94aa033e 1810 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
c05c4186
JF		 1811 attr->attr);
1812 break;
1813 default:
1814 r = -EINVAL;
1815 }
1816
1817 return r;
1818}
1819
1820static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
1821 u64 addr)
1822{
1823 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
1824 void *target = NULL;
1825 void __user *source;
1826 u64 size;
1827
1828 if (get_user(inti->type, (u64 __user *)addr))
1829 return -EFAULT;
1830
1831 switch (inti->type) {
3c038e6b
DD		 1832 case KVM_S390_INT_PFAULT_INIT:
1833 case KVM_S390_INT_PFAULT_DONE:
c05c4186
JF		 1834 case KVM_S390_INT_VIRTIO:
1835 case KVM_S390_INT_SERVICE:
1836 target = (void *) &inti->ext;
1837 source = &uptr->u.ext;
1838 size = sizeof(inti->ext);
1839 break;
1840 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1841 target = (void *) &inti->io;
1842 source = &uptr->u.io;
1843 size = sizeof(inti->io);
1844 break;
1845 case KVM_S390_MCHK:
1846 target = (void *) &inti->mchk;
1847 source = &uptr->u.mchk;
1848 size = sizeof(inti->mchk);
1849 break;
1850 default:
1851 return -EINVAL;
1852 }
1853
1854 if (copy_from_user(target, source, size))
1855 return -EFAULT;
1856
1857 return 0;
1858}
1859
1860static int enqueue_floating_irq(struct kvm_device *dev,
1861 struct kvm_device_attr *attr)
1862{
1863 struct kvm_s390_interrupt_info *inti = NULL;
1864 int r = 0;
1865 int len = attr->attr;
1866
1867 if (len % sizeof(struct kvm_s390_irq) != 0)
1868 return -EINVAL;
1869 else if (len > KVM_S390_FLIC_MAX_BUFFER)
1870 return -EINVAL;
1871
1872 while (len >= sizeof(struct kvm_s390_irq)) {
1873 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
1874 if (!inti)
1875 return -ENOMEM;
1876
1877 r = copy_irq_from_user(inti, attr->addr);
1878 if (r) {
1879 kfree(inti);
1880 return r;
1881 }
a91b8ebe
JF		 1882 r = __inject_vm(dev->kvm, inti);
1883 if (r) {
1884 kfree(inti);
1885 return r;
1886 }
c05c4186
JF		 1887 len -= sizeof(struct kvm_s390_irq);
1888 attr->addr += sizeof(struct kvm_s390_irq);
1889 }
1890
1891 return r;
1892}
1893
841b91c5
CH		 1894static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
1895{
1896 if (id >= MAX_S390_IO_ADAPTERS)
1897 return NULL;
1898 return kvm->arch.adapters[id];
1899}
1900
1901static int register_io_adapter(struct kvm_device *dev,
1902 struct kvm_device_attr *attr)
1903{
1904 struct s390_io_adapter *adapter;
1905 struct kvm_s390_io_adapter adapter_info;
1906
1907 if (copy_from_user(&adapter_info,
1908 (void __user *)attr->addr, sizeof(adapter_info)))
1909 return -EFAULT;
1910
1911 if ((adapter_info.id >= MAX_S390_IO_ADAPTERS) ||
1912 (dev->kvm->arch.adapters[adapter_info.id] != NULL))
1913 return -EINVAL;
1914
1915 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
1916 if (!adapter)
1917 return -ENOMEM;
1918
1919 INIT_LIST_HEAD(&adapter->maps);
1920 init_rwsem(&adapter->maps_lock);
1921 atomic_set(&adapter->nr_maps, 0);
1922 adapter->id = adapter_info.id;
1923 adapter->isc = adapter_info.isc;
1924 adapter->maskable = adapter_info.maskable;
1925 adapter->masked = false;
1926 adapter->swap = adapter_info.swap;
1927 dev->kvm->arch.adapters[adapter->id] = adapter;
1928
1929 return 0;
1930}
1931
1932int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
1933{
1934 int ret;
1935 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1936
1937 if (!adapter || !adapter->maskable)
1938 return -EINVAL;
1939 ret = adapter->masked;
1940 adapter->masked = masked;
1941 return ret;
1942}
1943
1944static int kvm_s390_adapter_map(struct kvm *kvm, unsigned int id, __u64 addr)
1945{
1946 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1947 struct s390_map_info *map;
1948 int ret;
1949
1950 if (!adapter || !addr)
1951 return -EINVAL;
1952
1953 map = kzalloc(sizeof(*map), GFP_KERNEL);
1954 if (!map) {
1955 ret = -ENOMEM;
1956 goto out;
1957 }
1958 INIT_LIST_HEAD(&map->list);
1959 map->guest_addr = addr;
6e0a0431 1960 map->addr = gmap_translate(kvm->arch.gmap, addr);
841b91c5
CH		 1961 if (map->addr == -EFAULT) {
1962 ret = -EFAULT;
1963 goto out;
1964 }
1965 ret = get_user_pages_fast(map->addr, 1, 1, &map->page);
1966 if (ret < 0)
1967 goto out;
1968 BUG_ON(ret != 1);
1969 down_write(&adapter->maps_lock);
1970 if (atomic_inc_return(&adapter->nr_maps) < MAX_S390_ADAPTER_MAPS) {
1971 list_add_tail(&map->list, &adapter->maps);
1972 ret = 0;
1973 } else {
1974 put_page(map->page);
1975 ret = -EINVAL;
1976 }
1977 up_write(&adapter->maps_lock);
1978out:
1979 if (ret)
1980 kfree(map);
1981 return ret;
1982}
1983
1984static int kvm_s390_adapter_unmap(struct kvm *kvm, unsigned int id, __u64 addr)
1985{
1986 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
1987 struct s390_map_info *map, *tmp;
1988 int found = 0;
1989
1990 if (!adapter || !addr)
1991 return -EINVAL;
1992
1993 down_write(&adapter->maps_lock);
1994 list_for_each_entry_safe(map, tmp, &adapter->maps, list) {
1995 if (map->guest_addr == addr) {
1996 found = 1;
1997 atomic_dec(&adapter->nr_maps);
1998 list_del(&map->list);
1999 put_page(map->page);
2000 kfree(map);
2001 break;
2002 }
2003 }
2004 up_write(&adapter->maps_lock);
2005
2006 return found ? 0 : -EINVAL;
2007}
2008
2009void kvm_s390_destroy_adapters(struct kvm *kvm)
2010{
2011 int i;
2012 struct s390_map_info *map, *tmp;
2013
2014 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++) {
2015 if (!kvm->arch.adapters[i])
2016 continue;
2017 list_for_each_entry_safe(map, tmp,
2018 &kvm->arch.adapters[i]->maps, list) {
2019 list_del(&map->list);
2020 put_page(map->page);
2021 kfree(map);
2022 }
2023 kfree(kvm->arch.adapters[i]);
2024 }
2025}
2026
2027static int modify_io_adapter(struct kvm_device *dev,
2028 struct kvm_device_attr *attr)
2029{
2030 struct kvm_s390_io_adapter_req req;
2031 struct s390_io_adapter *adapter;
2032 int ret;
2033
2034 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2035 return -EFAULT;
2036
2037 adapter = get_io_adapter(dev->kvm, req.id);
2038 if (!adapter)
2039 return -EINVAL;
2040 switch (req.type) {
2041 case KVM_S390_IO_ADAPTER_MASK:
2042 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2043 if (ret > 0)
2044 ret = 0;
2045 break;
2046 case KVM_S390_IO_ADAPTER_MAP:
2047 ret = kvm_s390_adapter_map(dev->kvm, req.id, req.addr);
2048 break;
2049 case KVM_S390_IO_ADAPTER_UNMAP:
2050 ret = kvm_s390_adapter_unmap(dev->kvm, req.id, req.addr);
2051 break;
2052 default:
2053 ret = -EINVAL;
2054 }
2055
2056 return ret;
2057}
2058
6d28f789
HP		 2059static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2060
2061{
2062 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2063 u32 schid;
2064
2065 if (attr->flags)
2066 return -EINVAL;
2067 if (attr->attr != sizeof(schid))
2068 return -EINVAL;
2069 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2070 return -EFAULT;
2071 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2072 /*
2073 * If userspace is conforming to the architecture, we can have at most
2074 * one pending I/O interrupt per subchannel, so this is effectively a
2075 * clear all.
2076 */
2077 return 0;
2078}
2079
c05c4186
JF		 2080static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2081{
2082 int r = 0;
3c038e6b
DD		 2083 unsigned int i;
2084 struct kvm_vcpu *vcpu;
c05c4186
JF		 2085
2086 switch (attr->group) {
2087 case KVM_DEV_FLIC_ENQUEUE:
2088 r = enqueue_floating_irq(dev, attr);
2089 break;
2090 case KVM_DEV_FLIC_CLEAR_IRQS:
67335e63 2091 kvm_s390_clear_float_irqs(dev->kvm);
c05c4186 2092 break;
3c038e6b
DD		 2093 case KVM_DEV_FLIC_APF_ENABLE:
2094 dev->kvm->arch.gmap->pfault_enabled = 1;
2095 break;
2096 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2097 dev->kvm->arch.gmap->pfault_enabled = 0;
2098 /*
2099 * Make sure no async faults are in transition when
2100 * clearing the queues. So we don't need to worry
2101 * about late coming workers.
2102 */
2103 synchronize_srcu(&dev->kvm->srcu);
2104 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2105 kvm_clear_async_pf_completion_queue(vcpu);
2106 break;
841b91c5
CH		 2107 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2108 r = register_io_adapter(dev, attr);
2109 break;
2110 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2111 r = modify_io_adapter(dev, attr);
2112 break;
6d28f789
HP		 2113 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2114 r = clear_io_irq(dev->kvm, attr);
2115 break;
c05c4186
JF		 2116 default:
2117 r = -EINVAL;
2118 }
2119
2120 return r;
2121}
2122
4f129858
HP		 2123static int flic_has_attr(struct kvm_device *dev,
2124 struct kvm_device_attr *attr)
2125{
2126 switch (attr->group) {
2127 case KVM_DEV_FLIC_GET_ALL_IRQS:
2128 case KVM_DEV_FLIC_ENQUEUE:
2129 case KVM_DEV_FLIC_CLEAR_IRQS:
2130 case KVM_DEV_FLIC_APF_ENABLE:
2131 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2132 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2133 case KVM_DEV_FLIC_ADAPTER_MODIFY:
6d28f789 2134 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
4f129858
HP		 2135 return 0;
2136 }
2137 return -ENXIO;
2138}
2139
c05c4186
JF		 2140static int flic_create(struct kvm_device *dev, u32 type)
2141{
2142 if (!dev)
2143 return -EINVAL;
2144 if (dev->kvm->arch.flic)
2145 return -EINVAL;
2146 dev->kvm->arch.flic = dev;
2147 return 0;
2148}
2149
2150static void flic_destroy(struct kvm_device *dev)
2151{
2152 dev->kvm->arch.flic = NULL;
2153 kfree(dev);
2154}
2155
2156/* s390 floating irq controller (flic) */
2157struct kvm_device_ops kvm_flic_ops = {
2158 .name = "kvm-flic",
2159 .get_attr = flic_get_attr,
2160 .set_attr = flic_set_attr,
4f129858 2161 .has_attr = flic_has_attr,
c05c4186
JF		 2162 .create = flic_create,
2163 .destroy = flic_destroy,
2164};
84223598
CH		 2165
2166static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2167{
2168 unsigned long bit;
2169
2170 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2171
2172 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2173}
2174
2175static struct s390_map_info *get_map_info(struct s390_io_adapter *adapter,
2176 u64 addr)
2177{
2178 struct s390_map_info *map;
2179
2180 if (!adapter)
2181 return NULL;
2182
2183 list_for_each_entry(map, &adapter->maps, list) {
2184 if (map->guest_addr == addr)
2185 return map;
2186 }
2187 return NULL;
2188}
2189
2190static int adapter_indicators_set(struct kvm *kvm,
2191 struct s390_io_adapter *adapter,
2192 struct kvm_s390_adapter_int *adapter_int)
2193{
2194 unsigned long bit;
2195 int summary_set, idx;
2196 struct s390_map_info *info;
2197 void *map;
2198
2199 info = get_map_info(adapter, adapter_int->ind_addr);
2200 if (!info)
2201 return -1;
2202 map = page_address(info->page);
2203 bit = get_ind_bit(info->addr, adapter_int->ind_offset, adapter->swap);
2204 set_bit(bit, map);
2205 idx = srcu_read_lock(&kvm->srcu);
2206 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2207 set_page_dirty_lock(info->page);
2208 info = get_map_info(adapter, adapter_int->summary_addr);
2209 if (!info) {
2210 srcu_read_unlock(&kvm->srcu, idx);
2211 return -1;
2212 }
2213 map = page_address(info->page);
2214 bit = get_ind_bit(info->addr, adapter_int->summary_offset,
2215 adapter->swap);
2216 summary_set = test_and_set_bit(bit, map);
2217 mark_page_dirty(kvm, info->guest_addr >> PAGE_SHIFT);
2218 set_page_dirty_lock(info->page);
2219 srcu_read_unlock(&kvm->srcu, idx);
2220 return summary_set ? 0 : 1;
2221}
2222
2223/*
2224 * < 0 - not injected due to error
2225 * = 0 - coalesced, summary indicator already active
2226 * > 0 - injected interrupt
2227 */
2228static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2229 struct kvm *kvm, int irq_source_id, int level,
2230 bool line_status)
2231{
2232 int ret;
2233 struct s390_io_adapter *adapter;
2234
2235 /* We're only interested in the 0->1 transition. */
2236 if (!level)
2237 return 0;
2238 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2239 if (!adapter)
2240 return -1;
2241 down_read(&adapter->maps_lock);
2242 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2243 up_read(&adapter->maps_lock);
2244 if ((ret > 0) && !adapter->masked) {
2245 struct kvm_s390_interrupt s390int = {
2246 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2247 .parm = 0,
2248 .parm64 = (adapter->isc << 27) | 0x80000000,
2249 };
2250 ret = kvm_s390_inject_vm(kvm, &s390int);
2251 if (ret == 0)
2252 ret = 1;
2253 }
2254 return ret;
2255}
2256
c63cf538
RK		 2257int kvm_set_routing_entry(struct kvm *kvm,
2258 struct kvm_kernel_irq_routing_entry *e,
84223598
CH		 2259 const struct kvm_irq_routing_entry *ue)
2260{
2261 int ret;
2262
2263 switch (ue->type) {
2264 case KVM_IRQ_ROUTING_S390_ADAPTER:
2265 e->set = set_adapter_int;
2266 e->adapter.summary_addr = ue->u.adapter.summary_addr;
2267 e->adapter.ind_addr = ue->u.adapter.ind_addr;
2268 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2269 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2270 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2271 ret = 0;
2272 break;
2273 default:
2274 ret = -EINVAL;
2275 }
2276
2277 return ret;
2278}
2279
2280int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2281 int irq_source_id, int level, bool line_status)
2282{
2283 return -EINVAL;
2284}
816c7667
JF		 2285
2286int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2287{
2288 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2289 struct kvm_s390_irq *buf;
2290 int r = 0;
2291 int n;
2292
2293 buf = vmalloc(len);
2294 if (!buf)
2295 return -ENOMEM;
2296
2297 if (copy_from_user((void *) buf, irqstate, len)) {
2298 r = -EFAULT;
2299 goto out_free;
2300 }
2301
2302 /*
2303 * Don't allow setting the interrupt state
2304 * when there are already interrupts pending
2305 */
2306 spin_lock(&li->lock);
2307 if (li->pending_irqs) {
2308 r = -EBUSY;
2309 goto out_unlock;
2310 }
2311
2312 for (n = 0; n < len / sizeof(*buf); n++) {
2313 r = do_inject_vcpu(vcpu, &buf[n]);
2314 if (r)
2315 break;
2316 }
2317
2318out_unlock:
2319 spin_unlock(&li->lock);
2320out_free:
2321 vfree(buf);
2322
2323 return r;
2324}
2325
2326static void store_local_irq(struct kvm_s390_local_interrupt *li,
2327 struct kvm_s390_irq *irq,
2328 unsigned long irq_type)
2329{
2330 switch (irq_type) {
2331 case IRQ_PEND_MCHK_EX:
2332 case IRQ_PEND_MCHK_REP:
2333 irq->type = KVM_S390_MCHK;
2334 irq->u.mchk = li->irq.mchk;
2335 break;
2336 case IRQ_PEND_PROG:
2337 irq->type = KVM_S390_PROGRAM_INT;
2338 irq->u.pgm = li->irq.pgm;
2339 break;
2340 case IRQ_PEND_PFAULT_INIT:
2341 irq->type = KVM_S390_INT_PFAULT_INIT;
2342 irq->u.ext = li->irq.ext;
2343 break;
2344 case IRQ_PEND_EXT_EXTERNAL:
2345 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2346 irq->u.extcall = li->irq.extcall;
2347 break;
2348 case IRQ_PEND_EXT_CLOCK_COMP:
2349 irq->type = KVM_S390_INT_CLOCK_COMP;
2350 break;
2351 case IRQ_PEND_EXT_CPU_TIMER:
2352 irq->type = KVM_S390_INT_CPU_TIMER;
2353 break;
2354 case IRQ_PEND_SIGP_STOP:
2355 irq->type = KVM_S390_SIGP_STOP;
2356 irq->u.stop = li->irq.stop;
2357 break;
2358 case IRQ_PEND_RESTART:
2359 irq->type = KVM_S390_RESTART;
2360 break;
2361 case IRQ_PEND_SET_PREFIX:
2362 irq->type = KVM_S390_SIGP_SET_PREFIX;
2363 irq->u.prefix = li->irq.prefix;
2364 break;
2365 }
2366}
2367
2368int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
2369{
a5bd7647 2370 int scn;
816c7667
JF		 2371 unsigned long sigp_emerg_pending[BITS_TO_LONGS(KVM_MAX_VCPUS)];
2372 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2373 unsigned long pending_irqs;
2374 struct kvm_s390_irq irq;
2375 unsigned long irq_type;
2376 int cpuaddr;
2377 int n = 0;
2378
2379 spin_lock(&li->lock);
2380 pending_irqs = li->pending_irqs;
2381 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
2382 sizeof(sigp_emerg_pending));
2383 spin_unlock(&li->lock);
2384
2385 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
2386 memset(&irq, 0, sizeof(irq));
2387 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
2388 continue;
2389 if (n + sizeof(irq) > len)
2390 return -ENOBUFS;
2391 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
2392 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2393 return -EFAULT;
2394 n += sizeof(irq);
2395 }
2396
2397 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
2398 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
2399 memset(&irq, 0, sizeof(irq));
2400 if (n + sizeof(irq) > len)
2401 return -ENOBUFS;
2402 irq.type = KVM_S390_INT_EMERGENCY;
2403 irq.u.emerg.code = cpuaddr;
2404 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2405 return -EFAULT;
2406 n += sizeof(irq);
2407 }
2408 }
2409
a5bd7647 2410 if (sca_ext_call_pending(vcpu, &scn)) {
816c7667
JF		 2411 if (n + sizeof(irq) > len)
2412 return -ENOBUFS;
2413 memset(&irq, 0, sizeof(irq));
2414 irq.type = KVM_S390_INT_EXTERNAL_CALL;
a5bd7647 2415 irq.u.extcall.code = scn;
816c7667
JF		 2416 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
2417 return -EFAULT;
2418 n += sizeof(irq);
2419 }
2420
2421 return n;
2422}
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