1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * handling kvm guest interrupts
4 *
5 * Copyright IBM Corp. 2008, 2020
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 */
9
10 #define KMSG_COMPONENT "kvm-s390"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13 #include <linux/cpufeature.h>
14 #include <linux/interrupt.h>
15 #include <linux/kvm_host.h>
16 #include <linux/hrtimer.h>
17 #include <linux/export.h>
18 #include <linux/mmu_context.h>
19 #include <linux/nospec.h>
20 #include <linux/signal.h>
21 #include <linux/slab.h>
22 #include <linux/bitmap.h>
23 #include <linux/vmalloc.h>
24 #include <asm/access-regs.h>
25 #include <asm/asm-offsets.h>
26 #include <asm/dis.h>
27 #include <linux/uaccess.h>
28 #include <asm/sclp.h>
29 #include <asm/isc.h>
30 #include <asm/gmap.h>
31 #include <asm/nmi.h>
32 #include <asm/airq.h>
33 #include <asm/tpi.h>
34 #include "kvm-s390.h"
35 #include "gaccess.h"
36 #include "trace-s390.h"
37 #include "pci.h"
38
39 #define PFAULT_INIT 0x0600
40 #define PFAULT_DONE 0x0680
41 #define VIRTIO_PARAM 0x0d00
42
43 static struct kvm_s390_gib *gib;
44
45 /* handle external calls via sigp interpretation facility */
sca_ext_call_pending(struct kvm_vcpu * vcpu,int * src_id)46 static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id)
47 {
48 int c, scn;
49
50 if (!kvm_s390_test_cpuflags(vcpu, CPUSTAT_ECALL_PEND))
51 return 0;
52
53 BUG_ON(!kvm_s390_use_sca_entries());
54 read_lock(&vcpu->kvm->arch.sca_lock);
55 if (vcpu->kvm->arch.use_esca) {
56 struct esca_block *sca = vcpu->kvm->arch.sca;
57 union esca_sigp_ctrl sigp_ctrl =
58 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
59
60 c = sigp_ctrl.c;
61 scn = sigp_ctrl.scn;
62 } else {
63 struct bsca_block *sca = vcpu->kvm->arch.sca;
64 union bsca_sigp_ctrl sigp_ctrl =
65 sca->cpu[vcpu->vcpu_id].sigp_ctrl;
66
67 c = sigp_ctrl.c;
68 scn = sigp_ctrl.scn;
69 }
70 read_unlock(&vcpu->kvm->arch.sca_lock);
71
72 if (src_id)
73 *src_id = scn;
74
75 return c;
76 }
77
sca_inject_ext_call(struct kvm_vcpu * vcpu,int src_id)78 static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id)
79 {
80 int expect, rc;
81
82 BUG_ON(!kvm_s390_use_sca_entries());
83 read_lock(&vcpu->kvm->arch.sca_lock);
84 if (vcpu->kvm->arch.use_esca) {
85 struct esca_block *sca = vcpu->kvm->arch.sca;
86 union esca_sigp_ctrl *sigp_ctrl =
87 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
88 union esca_sigp_ctrl new_val = {0}, old_val;
89
90 old_val = READ_ONCE(*sigp_ctrl);
91 new_val.scn = src_id;
92 new_val.c = 1;
93 old_val.c = 0;
94
95 expect = old_val.value;
96 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
97 } else {
98 struct bsca_block *sca = vcpu->kvm->arch.sca;
99 union bsca_sigp_ctrl *sigp_ctrl =
100 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
101 union bsca_sigp_ctrl new_val = {0}, old_val;
102
103 old_val = READ_ONCE(*sigp_ctrl);
104 new_val.scn = src_id;
105 new_val.c = 1;
106 old_val.c = 0;
107
108 expect = old_val.value;
109 rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value);
110 }
111 read_unlock(&vcpu->kvm->arch.sca_lock);
112
113 if (rc != expect) {
114 /* another external call is pending */
115 return -EBUSY;
116 }
117 kvm_s390_set_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
118 return 0;
119 }
120
sca_clear_ext_call(struct kvm_vcpu * vcpu)121 static void sca_clear_ext_call(struct kvm_vcpu *vcpu)
122 {
123 if (!kvm_s390_use_sca_entries())
124 return;
125 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_ECALL_PEND);
126 read_lock(&vcpu->kvm->arch.sca_lock);
127 if (vcpu->kvm->arch.use_esca) {
128 struct esca_block *sca = vcpu->kvm->arch.sca;
129 union esca_sigp_ctrl *sigp_ctrl =
130 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
131
132 WRITE_ONCE(sigp_ctrl->value, 0);
133 } else {
134 struct bsca_block *sca = vcpu->kvm->arch.sca;
135 union bsca_sigp_ctrl *sigp_ctrl =
136 &(sca->cpu[vcpu->vcpu_id].sigp_ctrl);
137
138 WRITE_ONCE(sigp_ctrl->value, 0);
139 }
140 read_unlock(&vcpu->kvm->arch.sca_lock);
141 }
142
psw_extint_disabled(struct kvm_vcpu * vcpu)143 int psw_extint_disabled(struct kvm_vcpu *vcpu)
144 {
145 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_EXT);
146 }
147
psw_ioint_disabled(struct kvm_vcpu * vcpu)148 static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
149 {
150 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
151 }
152
psw_mchk_disabled(struct kvm_vcpu * vcpu)153 static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
154 {
155 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
156 }
157
psw_interrupts_disabled(struct kvm_vcpu * vcpu)158 static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
159 {
160 return psw_extint_disabled(vcpu) &&
161 psw_ioint_disabled(vcpu) &&
162 psw_mchk_disabled(vcpu);
163 }
164
ckc_interrupts_enabled(struct kvm_vcpu * vcpu)165 static int ckc_interrupts_enabled(struct kvm_vcpu *vcpu)
166 {
167 if (psw_extint_disabled(vcpu) ||
168 !(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
169 return 0;
170 if (guestdbg_enabled(vcpu) && guestdbg_sstep_enabled(vcpu))
171 /* No timer interrupts when single stepping */
172 return 0;
173 return 1;
174 }
175
ckc_irq_pending(struct kvm_vcpu * vcpu)176 static int ckc_irq_pending(struct kvm_vcpu *vcpu)
177 {
178 const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
179 const u64 ckc = vcpu->arch.sie_block->ckc;
180
181 if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
182 if ((s64)ckc >= (s64)now)
183 return 0;
184 } else if (ckc >= now) {
185 return 0;
186 }
187 return ckc_interrupts_enabled(vcpu);
188 }
189
cpu_timer_interrupts_enabled(struct kvm_vcpu * vcpu)190 static int cpu_timer_interrupts_enabled(struct kvm_vcpu *vcpu)
191 {
192 return !psw_extint_disabled(vcpu) &&
193 (vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK);
194 }
195
cpu_timer_irq_pending(struct kvm_vcpu * vcpu)196 static int cpu_timer_irq_pending(struct kvm_vcpu *vcpu)
197 {
198 if (!cpu_timer_interrupts_enabled(vcpu))
199 return 0;
200 return kvm_s390_get_cpu_timer(vcpu) >> 63;
201 }
202
isc_to_isc_bits(int isc)203 static uint64_t isc_to_isc_bits(int isc)
204 {
205 return (0x80 >> isc) << 24;
206 }
207
isc_to_int_word(u8 isc)208 static inline u32 isc_to_int_word(u8 isc)
209 {
210 return ((u32)isc << 27) | 0x80000000;
211 }
212
int_word_to_isc(u32 int_word)213 static inline u8 int_word_to_isc(u32 int_word)
214 {
215 return (int_word & 0x38000000) >> 27;
216 }
217
218 /*
219 * To use atomic bitmap functions, we have to provide a bitmap address
220 * that is u64 aligned. However, the ipm might be u32 aligned.
221 * Therefore, we logically start the bitmap at the very beginning of the
222 * struct and fixup the bit number.
223 */
224 #define IPM_BIT_OFFSET (offsetof(struct kvm_s390_gisa, ipm) * BITS_PER_BYTE)
225
226 /**
227 * gisa_set_iam - change the GISA interruption alert mask
228 *
229 * @gisa: gisa to operate on
230 * @iam: new IAM value to use
231 *
232 * Change the IAM atomically with the next alert address and the IPM
233 * of the GISA if the GISA is not part of the GIB alert list. All three
234 * fields are located in the first long word of the GISA.
235 *
236 * Returns: 0 on success
237 * -EBUSY in case the gisa is part of the alert list
238 */
gisa_set_iam(struct kvm_s390_gisa * gisa,u8 iam)239 static inline int gisa_set_iam(struct kvm_s390_gisa *gisa, u8 iam)
240 {
241 u64 word, _word;
242
243 word = READ_ONCE(gisa->u64.word[0]);
244 do {
245 if ((u64)gisa != word >> 32)
246 return -EBUSY;
247 _word = (word & ~0xffUL) | iam;
248 } while (!try_cmpxchg(&gisa->u64.word[0], &word, _word));
249
250 return 0;
251 }
252
253 /**
254 * gisa_clear_ipm - clear the GISA interruption pending mask
255 *
256 * @gisa: gisa to operate on
257 *
258 * Clear the IPM atomically with the next alert address and the IAM
259 * of the GISA unconditionally. All three fields are located in the
260 * first long word of the GISA.
261 */
gisa_clear_ipm(struct kvm_s390_gisa * gisa)262 static inline void gisa_clear_ipm(struct kvm_s390_gisa *gisa)
263 {
264 u64 word, _word;
265
266 word = READ_ONCE(gisa->u64.word[0]);
267 do {
268 _word = word & ~(0xffUL << 24);
269 } while (!try_cmpxchg(&gisa->u64.word[0], &word, _word));
270 }
271
272 /**
273 * gisa_get_ipm_or_restore_iam - return IPM or restore GISA IAM
274 *
275 * @gi: gisa interrupt struct to work on
276 *
277 * Atomically restores the interruption alert mask if none of the
278 * relevant ISCs are pending and return the IPM.
279 *
280 * Returns: the relevant pending ISCs
281 */
gisa_get_ipm_or_restore_iam(struct kvm_s390_gisa_interrupt * gi)282 static inline u8 gisa_get_ipm_or_restore_iam(struct kvm_s390_gisa_interrupt *gi)
283 {
284 u8 pending_mask, alert_mask;
285 u64 word, _word;
286
287 word = READ_ONCE(gi->origin->u64.word[0]);
288 do {
289 alert_mask = READ_ONCE(gi->alert.mask);
290 pending_mask = (u8)(word >> 24) & alert_mask;
291 if (pending_mask)
292 return pending_mask;
293 _word = (word & ~0xffUL) | alert_mask;
294 } while (!try_cmpxchg(&gi->origin->u64.word[0], &word, _word));
295
296 return 0;
297 }
298
gisa_set_ipm_gisc(struct kvm_s390_gisa * gisa,u32 gisc)299 static inline void gisa_set_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
300 {
301 set_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
302 }
303
gisa_get_ipm(struct kvm_s390_gisa * gisa)304 static inline u8 gisa_get_ipm(struct kvm_s390_gisa *gisa)
305 {
306 return READ_ONCE(gisa->ipm);
307 }
308
gisa_tac_ipm_gisc(struct kvm_s390_gisa * gisa,u32 gisc)309 static inline int gisa_tac_ipm_gisc(struct kvm_s390_gisa *gisa, u32 gisc)
310 {
311 return test_and_clear_bit_inv(IPM_BIT_OFFSET + gisc, (unsigned long *) gisa);
312 }
313
pending_irqs_no_gisa(struct kvm_vcpu * vcpu)314 static inline unsigned long pending_irqs_no_gisa(struct kvm_vcpu *vcpu)
315 {
316 unsigned long pending = vcpu->kvm->arch.float_int.pending_irqs |
317 vcpu->arch.local_int.pending_irqs;
318
319 pending &= ~vcpu->kvm->arch.float_int.masked_irqs;
320 return pending;
321 }
322
pending_irqs(struct kvm_vcpu * vcpu)323 static inline unsigned long pending_irqs(struct kvm_vcpu *vcpu)
324 {
325 struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
326 unsigned long pending_mask;
327
328 pending_mask = pending_irqs_no_gisa(vcpu);
329 if (gi->origin)
330 pending_mask |= gisa_get_ipm(gi->origin) << IRQ_PEND_IO_ISC_7;
331 return pending_mask;
332 }
333
isc_to_irq_type(unsigned long isc)334 static inline int isc_to_irq_type(unsigned long isc)
335 {
336 return IRQ_PEND_IO_ISC_0 - isc;
337 }
338
irq_type_to_isc(unsigned long irq_type)339 static inline int irq_type_to_isc(unsigned long irq_type)
340 {
341 return IRQ_PEND_IO_ISC_0 - irq_type;
342 }
343
disable_iscs(struct kvm_vcpu * vcpu,unsigned long active_mask)344 static unsigned long disable_iscs(struct kvm_vcpu *vcpu,
345 unsigned long active_mask)
346 {
347 int i;
348
349 for (i = 0; i <= MAX_ISC; i++)
350 if (!(vcpu->arch.sie_block->gcr[6] & isc_to_isc_bits(i)))
351 active_mask &= ~(1UL << (isc_to_irq_type(i)));
352
353 return active_mask;
354 }
355
deliverable_irqs(struct kvm_vcpu * vcpu)356 static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
357 {
358 unsigned long active_mask;
359
360 active_mask = pending_irqs(vcpu);
361 if (!active_mask)
362 return 0;
363
364 if (psw_extint_disabled(vcpu))
365 active_mask &= ~IRQ_PEND_EXT_MASK;
366 if (psw_ioint_disabled(vcpu))
367 active_mask &= ~IRQ_PEND_IO_MASK;
368 else
369 active_mask = disable_iscs(vcpu, active_mask);
370 if (!(vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
371 __clear_bit(IRQ_PEND_EXT_EXTERNAL, &active_mask);
372 if (!(vcpu->arch.sie_block->gcr[0] & CR0_EMERGENCY_SIGNAL_SUBMASK))
373 __clear_bit(IRQ_PEND_EXT_EMERGENCY, &active_mask);
374 if (!(vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SUBMASK))
375 __clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &active_mask);
376 if (!(vcpu->arch.sie_block->gcr[0] & CR0_CPU_TIMER_SUBMASK))
377 __clear_bit(IRQ_PEND_EXT_CPU_TIMER, &active_mask);
378 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK)) {
379 __clear_bit(IRQ_PEND_EXT_SERVICE, &active_mask);
380 __clear_bit(IRQ_PEND_EXT_SERVICE_EV, &active_mask);
381 }
382 if (psw_mchk_disabled(vcpu))
383 active_mask &= ~IRQ_PEND_MCHK_MASK;
384 /* PV guest cpus can have a single interruption injected at a time. */
385 if (kvm_s390_pv_cpu_get_handle(vcpu) &&
386 vcpu->arch.sie_block->iictl != IICTL_CODE_NONE)
387 active_mask &= ~(IRQ_PEND_EXT_II_MASK |
388 IRQ_PEND_IO_MASK |
389 IRQ_PEND_MCHK_MASK);
390 /*
391 * Check both floating and local interrupt's cr14 because
392 * bit IRQ_PEND_MCHK_REP could be set in both cases.
393 */
394 if (!(vcpu->arch.sie_block->gcr[14] &
395 (vcpu->kvm->arch.float_int.mchk.cr14 |
396 vcpu->arch.local_int.irq.mchk.cr14)))
397 __clear_bit(IRQ_PEND_MCHK_REP, &active_mask);
398
399 /*
400 * STOP irqs will never be actively delivered. They are triggered via
401 * intercept requests and cleared when the stop intercept is performed.
402 */
403 __clear_bit(IRQ_PEND_SIGP_STOP, &active_mask);
404
405 return active_mask;
406 }
407
__set_cpu_idle(struct kvm_vcpu * vcpu)408 static void __set_cpu_idle(struct kvm_vcpu *vcpu)
409 {
410 kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT);
411 set_bit(vcpu->vcpu_idx, vcpu->kvm->arch.idle_mask);
412 }
413
__unset_cpu_idle(struct kvm_vcpu * vcpu)414 static void __unset_cpu_idle(struct kvm_vcpu *vcpu)
415 {
416 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT);
417 clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.idle_mask);
418 }
419
__reset_intercept_indicators(struct kvm_vcpu * vcpu)420 static void __reset_intercept_indicators(struct kvm_vcpu *vcpu)
421 {
422 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IO_INT | CPUSTAT_EXT_INT |
423 CPUSTAT_STOP_INT);
424 vcpu->arch.sie_block->lctl = 0x0000;
425 vcpu->arch.sie_block->ictl &= ~(ICTL_LPSW | ICTL_STCTL | ICTL_PINT);
426
427 if (guestdbg_enabled(vcpu)) {
428 vcpu->arch.sie_block->lctl |= (LCTL_CR0 | LCTL_CR9 |
429 LCTL_CR10 | LCTL_CR11);
430 vcpu->arch.sie_block->ictl |= (ICTL_STCTL | ICTL_PINT);
431 }
432 }
433
set_intercept_indicators_io(struct kvm_vcpu * vcpu)434 static void set_intercept_indicators_io(struct kvm_vcpu *vcpu)
435 {
436 if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_IO_MASK))
437 return;
438 if (psw_ioint_disabled(vcpu))
439 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IO_INT);
440 else
441 vcpu->arch.sie_block->lctl |= LCTL_CR6;
442 }
443
set_intercept_indicators_ext(struct kvm_vcpu * vcpu)444 static void set_intercept_indicators_ext(struct kvm_vcpu *vcpu)
445 {
446 if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_EXT_MASK))
447 return;
448 if (psw_extint_disabled(vcpu))
449 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
450 else
451 vcpu->arch.sie_block->lctl |= LCTL_CR0;
452 }
453
set_intercept_indicators_mchk(struct kvm_vcpu * vcpu)454 static void set_intercept_indicators_mchk(struct kvm_vcpu *vcpu)
455 {
456 if (!(pending_irqs_no_gisa(vcpu) & IRQ_PEND_MCHK_MASK))
457 return;
458 if (psw_mchk_disabled(vcpu))
459 vcpu->arch.sie_block->ictl |= ICTL_LPSW;
460 else
461 vcpu->arch.sie_block->lctl |= LCTL_CR14;
462 }
463
set_intercept_indicators_stop(struct kvm_vcpu * vcpu)464 static void set_intercept_indicators_stop(struct kvm_vcpu *vcpu)
465 {
466 if (kvm_s390_is_stop_irq_pending(vcpu))
467 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
468 }
469
470 /* Set interception request for non-deliverable interrupts */
set_intercept_indicators(struct kvm_vcpu * vcpu)471 static void set_intercept_indicators(struct kvm_vcpu *vcpu)
472 {
473 set_intercept_indicators_io(vcpu);
474 set_intercept_indicators_ext(vcpu);
475 set_intercept_indicators_mchk(vcpu);
476 set_intercept_indicators_stop(vcpu);
477 }
478
__deliver_cpu_timer(struct kvm_vcpu * vcpu)479 static int __must_check __deliver_cpu_timer(struct kvm_vcpu *vcpu)
480 {
481 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
482 int rc = 0;
483
484 vcpu->stat.deliver_cputm++;
485 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
486 0, 0);
487 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
488 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
489 vcpu->arch.sie_block->eic = EXT_IRQ_CPU_TIMER;
490 } else {
491 rc = put_guest_lc(vcpu, EXT_IRQ_CPU_TIMER,
492 (u16 *)__LC_EXT_INT_CODE);
493 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
494 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
495 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
496 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
497 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
498 }
499 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
500 return rc ? -EFAULT : 0;
501 }
502
__deliver_ckc(struct kvm_vcpu * vcpu)503 static int __must_check __deliver_ckc(struct kvm_vcpu *vcpu)
504 {
505 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
506 int rc = 0;
507
508 vcpu->stat.deliver_ckc++;
509 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
510 0, 0);
511 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
512 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
513 vcpu->arch.sie_block->eic = EXT_IRQ_CLK_COMP;
514 } else {
515 rc = put_guest_lc(vcpu, EXT_IRQ_CLK_COMP,
516 (u16 __user *)__LC_EXT_INT_CODE);
517 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
518 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
519 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
520 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
521 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
522 }
523 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
524 return rc ? -EFAULT : 0;
525 }
526
__deliver_pfault_init(struct kvm_vcpu * vcpu)527 static int __must_check __deliver_pfault_init(struct kvm_vcpu *vcpu)
528 {
529 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
530 struct kvm_s390_ext_info ext;
531 int rc;
532
533 spin_lock(&li->lock);
534 ext = li->irq.ext;
535 clear_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
536 li->irq.ext.ext_params2 = 0;
537 spin_unlock(&li->lock);
538
539 VCPU_EVENT(vcpu, 4, "deliver: pfault init token 0x%llx",
540 ext.ext_params2);
541 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
542 KVM_S390_INT_PFAULT_INIT,
543 0, ext.ext_params2);
544
545 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE, (u16 *) __LC_EXT_INT_CODE);
546 rc |= put_guest_lc(vcpu, PFAULT_INIT, (u16 *) __LC_EXT_CPU_ADDR);
547 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
548 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
549 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
550 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
551 rc |= put_guest_lc(vcpu, ext.ext_params2, (u64 *) __LC_EXT_PARAMS2);
552 return rc ? -EFAULT : 0;
553 }
554
__write_machine_check(struct kvm_vcpu * vcpu,struct kvm_s390_mchk_info * mchk)555 static int __write_machine_check(struct kvm_vcpu *vcpu,
556 struct kvm_s390_mchk_info *mchk)
557 {
558 unsigned long ext_sa_addr;
559 unsigned long lc;
560 freg_t fprs[NUM_FPRS];
561 union mci mci;
562 int rc;
563
564 /*
565 * All other possible payload for a machine check (e.g. the register
566 * contents in the save area) will be handled by the ultravisor, as
567 * the hypervisor does not not have the needed information for
568 * protected guests.
569 */
570 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
571 vcpu->arch.sie_block->iictl = IICTL_CODE_MCHK;
572 vcpu->arch.sie_block->mcic = mchk->mcic;
573 vcpu->arch.sie_block->faddr = mchk->failing_storage_address;
574 vcpu->arch.sie_block->edc = mchk->ext_damage_code;
575 return 0;
576 }
577
578 mci.val = mchk->mcic;
579 /* take care of lazy register loading */
580 kvm_s390_fpu_store(vcpu->run);
581 save_access_regs(vcpu->run->s.regs.acrs);
582 if (cpu_has_gs() && vcpu->arch.gs_enabled)
583 save_gs_cb(current->thread.gs_cb);
584
585 /* Extended save area */
586 rc = read_guest_lc(vcpu, __LC_MCESAD, &ext_sa_addr,
587 sizeof(unsigned long));
588 /* Only bits 0 through 63-LC are used for address formation */
589 lc = ext_sa_addr & MCESA_LC_MASK;
590 if (test_kvm_facility(vcpu->kvm, 133)) {
591 switch (lc) {
592 case 0:
593 case 10:
594 ext_sa_addr &= ~0x3ffUL;
595 break;
596 case 11:
597 ext_sa_addr &= ~0x7ffUL;
598 break;
599 case 12:
600 ext_sa_addr &= ~0xfffUL;
601 break;
602 default:
603 ext_sa_addr = 0;
604 break;
605 }
606 } else {
607 ext_sa_addr &= ~0x3ffUL;
608 }
609
610 if (!rc && mci.vr && ext_sa_addr && test_kvm_facility(vcpu->kvm, 129)) {
611 if (write_guest_abs(vcpu, ext_sa_addr, vcpu->run->s.regs.vrs,
612 512))
613 mci.vr = 0;
614 } else {
615 mci.vr = 0;
616 }
617 if (!rc && mci.gs && ext_sa_addr && test_kvm_facility(vcpu->kvm, 133)
618 && (lc == 11 || lc == 12)) {
619 if (write_guest_abs(vcpu, ext_sa_addr + 1024,
620 &vcpu->run->s.regs.gscb, 32))
621 mci.gs = 0;
622 } else {
623 mci.gs = 0;
624 }
625
626 /* General interruption information */
627 rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
628 rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
629 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
630 rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
631 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
632 rc |= put_guest_lc(vcpu, mci.val, (u64 __user *) __LC_MCCK_CODE);
633
634 /* Register-save areas */
635 if (cpu_has_vx()) {
636 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
637 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
638 } else {
639 rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
640 vcpu->run->s.regs.fprs, 128);
641 }
642 rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
643 vcpu->run->s.regs.gprs, 128);
644 rc |= put_guest_lc(vcpu, vcpu->run->s.regs.fpc,
645 (u32 __user *) __LC_FP_CREG_SAVE_AREA);
646 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
647 (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
648 rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
649 (u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
650 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
651 (u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
652 rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
653 &vcpu->run->s.regs.acrs, 64);
654 rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
655 &vcpu->arch.sie_block->gcr, 128);
656
657 /* Extended interruption information */
658 rc |= put_guest_lc(vcpu, mchk->ext_damage_code,
659 (u32 __user *) __LC_EXT_DAMAGE_CODE);
660 rc |= put_guest_lc(vcpu, mchk->failing_storage_address,
661 (u64 __user *) __LC_MCCK_FAIL_STOR_ADDR);
662 rc |= write_guest_lc(vcpu, __LC_PSW_SAVE_AREA, &mchk->fixed_logout,
663 sizeof(mchk->fixed_logout));
664 return rc ? -EFAULT : 0;
665 }
666
__deliver_machine_check(struct kvm_vcpu * vcpu)667 static int __must_check __deliver_machine_check(struct kvm_vcpu *vcpu)
668 {
669 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
670 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
671 struct kvm_s390_mchk_info mchk = {};
672 int deliver = 0;
673 int rc = 0;
674
675 spin_lock(&fi->lock);
676 spin_lock(&li->lock);
677 if (test_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs) ||
678 test_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs)) {
679 /*
680 * If there was an exigent machine check pending, then any
681 * repressible machine checks that might have been pending
682 * are indicated along with it, so always clear bits for
683 * repressible and exigent interrupts
684 */
685 mchk = li->irq.mchk;
686 clear_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
687 clear_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
688 memset(&li->irq.mchk, 0, sizeof(mchk));
689 deliver = 1;
690 }
691 /*
692 * We indicate floating repressible conditions along with
693 * other pending conditions. Channel Report Pending and Channel
694 * Subsystem damage are the only two and are indicated by
695 * bits in mcic and masked in cr14.
696 */
697 if (test_and_clear_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
698 mchk.mcic |= fi->mchk.mcic;
699 mchk.cr14 |= fi->mchk.cr14;
700 memset(&fi->mchk, 0, sizeof(mchk));
701 deliver = 1;
702 }
703 spin_unlock(&li->lock);
704 spin_unlock(&fi->lock);
705
706 if (deliver) {
707 VCPU_EVENT(vcpu, 3, "deliver: machine check mcic 0x%llx",
708 mchk.mcic);
709 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
710 KVM_S390_MCHK,
711 mchk.cr14, mchk.mcic);
712 vcpu->stat.deliver_machine_check++;
713 rc = __write_machine_check(vcpu, &mchk);
714 }
715 return rc;
716 }
717
__deliver_restart(struct kvm_vcpu * vcpu)718 static int __must_check __deliver_restart(struct kvm_vcpu *vcpu)
719 {
720 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
721 int rc = 0;
722
723 VCPU_EVENT(vcpu, 3, "%s", "deliver: cpu restart");
724 vcpu->stat.deliver_restart_signal++;
725 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
726
727 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
728 vcpu->arch.sie_block->iictl = IICTL_CODE_RESTART;
729 } else {
730 rc = write_guest_lc(vcpu,
731 offsetof(struct lowcore, restart_old_psw),
732 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
733 rc |= read_guest_lc(vcpu, offsetof(struct lowcore, restart_psw),
734 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
735 }
736 clear_bit(IRQ_PEND_RESTART, &li->pending_irqs);
737 return rc ? -EFAULT : 0;
738 }
739
__deliver_set_prefix(struct kvm_vcpu * vcpu)740 static int __must_check __deliver_set_prefix(struct kvm_vcpu *vcpu)
741 {
742 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
743 struct kvm_s390_prefix_info prefix;
744
745 spin_lock(&li->lock);
746 prefix = li->irq.prefix;
747 li->irq.prefix.address = 0;
748 clear_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
749 spin_unlock(&li->lock);
750
751 vcpu->stat.deliver_prefix_signal++;
752 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
753 KVM_S390_SIGP_SET_PREFIX,
754 prefix.address, 0);
755
756 kvm_s390_set_prefix(vcpu, prefix.address);
757 return 0;
758 }
759
__deliver_emergency_signal(struct kvm_vcpu * vcpu)760 static int __must_check __deliver_emergency_signal(struct kvm_vcpu *vcpu)
761 {
762 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
763 int rc;
764 int cpu_addr;
765
766 spin_lock(&li->lock);
767 cpu_addr = find_first_bit(li->sigp_emerg_pending, KVM_MAX_VCPUS);
768 clear_bit(cpu_addr, li->sigp_emerg_pending);
769 if (bitmap_empty(li->sigp_emerg_pending, KVM_MAX_VCPUS))
770 clear_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
771 spin_unlock(&li->lock);
772
773 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp emerg");
774 vcpu->stat.deliver_emergency_signal++;
775 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
776 cpu_addr, 0);
777 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
778 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
779 vcpu->arch.sie_block->eic = EXT_IRQ_EMERGENCY_SIG;
780 vcpu->arch.sie_block->extcpuaddr = cpu_addr;
781 return 0;
782 }
783
784 rc = put_guest_lc(vcpu, EXT_IRQ_EMERGENCY_SIG,
785 (u16 *)__LC_EXT_INT_CODE);
786 rc |= put_guest_lc(vcpu, cpu_addr, (u16 *)__LC_EXT_CPU_ADDR);
787 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
788 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
789 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
790 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
791 return rc ? -EFAULT : 0;
792 }
793
__deliver_external_call(struct kvm_vcpu * vcpu)794 static int __must_check __deliver_external_call(struct kvm_vcpu *vcpu)
795 {
796 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
797 struct kvm_s390_extcall_info extcall;
798 int rc;
799
800 spin_lock(&li->lock);
801 extcall = li->irq.extcall;
802 li->irq.extcall.code = 0;
803 clear_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
804 spin_unlock(&li->lock);
805
806 VCPU_EVENT(vcpu, 4, "%s", "deliver: sigp ext call");
807 vcpu->stat.deliver_external_call++;
808 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
809 KVM_S390_INT_EXTERNAL_CALL,
810 extcall.code, 0);
811 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
812 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
813 vcpu->arch.sie_block->eic = EXT_IRQ_EXTERNAL_CALL;
814 vcpu->arch.sie_block->extcpuaddr = extcall.code;
815 return 0;
816 }
817
818 rc = put_guest_lc(vcpu, EXT_IRQ_EXTERNAL_CALL,
819 (u16 *)__LC_EXT_INT_CODE);
820 rc |= put_guest_lc(vcpu, extcall.code, (u16 *)__LC_EXT_CPU_ADDR);
821 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
822 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
823 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW, &vcpu->arch.sie_block->gpsw,
824 sizeof(psw_t));
825 return rc ? -EFAULT : 0;
826 }
827
__deliver_prog_pv(struct kvm_vcpu * vcpu,u16 code)828 static int __deliver_prog_pv(struct kvm_vcpu *vcpu, u16 code)
829 {
830 switch (code) {
831 case PGM_SPECIFICATION:
832 vcpu->arch.sie_block->iictl = IICTL_CODE_SPECIFICATION;
833 break;
834 case PGM_OPERAND:
835 vcpu->arch.sie_block->iictl = IICTL_CODE_OPERAND;
836 break;
837 default:
838 return -EINVAL;
839 }
840 return 0;
841 }
842
__deliver_prog(struct kvm_vcpu * vcpu)843 static int __must_check __deliver_prog(struct kvm_vcpu *vcpu)
844 {
845 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
846 struct kvm_s390_pgm_info pgm_info;
847 int rc = 0, nullifying = false;
848 u16 ilen;
849
850 spin_lock(&li->lock);
851 pgm_info = li->irq.pgm;
852 clear_bit(IRQ_PEND_PROG, &li->pending_irqs);
853 memset(&li->irq.pgm, 0, sizeof(pgm_info));
854 spin_unlock(&li->lock);
855
856 ilen = pgm_info.flags & KVM_S390_PGM_FLAGS_ILC_MASK;
857 VCPU_EVENT(vcpu, 3, "deliver: program irq code 0x%x, ilen:%d",
858 pgm_info.code, ilen);
859 vcpu->stat.deliver_program++;
860 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
861 pgm_info.code, 0);
862
863 /* PER is handled by the ultravisor */
864 if (kvm_s390_pv_cpu_is_protected(vcpu))
865 return __deliver_prog_pv(vcpu, pgm_info.code & ~PGM_PER);
866
867 switch (pgm_info.code & ~PGM_PER) {
868 case PGM_AFX_TRANSLATION:
869 case PGM_ASX_TRANSLATION:
870 case PGM_EX_TRANSLATION:
871 case PGM_LFX_TRANSLATION:
872 case PGM_LSTE_SEQUENCE:
873 case PGM_LSX_TRANSLATION:
874 case PGM_LX_TRANSLATION:
875 case PGM_PRIMARY_AUTHORITY:
876 case PGM_SECONDARY_AUTHORITY:
877 nullifying = true;
878 fallthrough;
879 case PGM_SPACE_SWITCH:
880 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
881 (u64 *)__LC_TRANS_EXC_CODE);
882 break;
883 case PGM_ALEN_TRANSLATION:
884 case PGM_ALE_SEQUENCE:
885 case PGM_ASTE_INSTANCE:
886 case PGM_ASTE_SEQUENCE:
887 case PGM_ASTE_VALIDITY:
888 case PGM_EXTENDED_AUTHORITY:
889 rc = put_guest_lc(vcpu, pgm_info.exc_access_id,
890 (u8 *)__LC_EXC_ACCESS_ID);
891 nullifying = true;
892 break;
893 case PGM_ASCE_TYPE:
894 case PGM_PAGE_TRANSLATION:
895 case PGM_REGION_FIRST_TRANS:
896 case PGM_REGION_SECOND_TRANS:
897 case PGM_REGION_THIRD_TRANS:
898 case PGM_SEGMENT_TRANSLATION:
899 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
900 (u64 *)__LC_TRANS_EXC_CODE);
901 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
902 (u8 *)__LC_EXC_ACCESS_ID);
903 rc |= put_guest_lc(vcpu, pgm_info.op_access_id,
904 (u8 *)__LC_OP_ACCESS_ID);
905 nullifying = true;
906 break;
907 case PGM_MONITOR:
908 rc = put_guest_lc(vcpu, pgm_info.mon_class_nr,
909 (u16 *)__LC_MON_CLASS_NR);
910 rc |= put_guest_lc(vcpu, pgm_info.mon_code,
911 (u64 *)__LC_MON_CODE);
912 break;
913 case PGM_VECTOR_PROCESSING:
914 case PGM_DATA:
915 rc = put_guest_lc(vcpu, pgm_info.data_exc_code,
916 (u32 *)__LC_DATA_EXC_CODE);
917 break;
918 case PGM_PROTECTION:
919 rc = put_guest_lc(vcpu, pgm_info.trans_exc_code,
920 (u64 *)__LC_TRANS_EXC_CODE);
921 rc |= put_guest_lc(vcpu, pgm_info.exc_access_id,
922 (u8 *)__LC_EXC_ACCESS_ID);
923 break;
924 case PGM_STACK_FULL:
925 case PGM_STACK_EMPTY:
926 case PGM_STACK_SPECIFICATION:
927 case PGM_STACK_TYPE:
928 case PGM_STACK_OPERATION:
929 case PGM_TRACE_TABEL:
930 case PGM_CRYPTO_OPERATION:
931 nullifying = true;
932 break;
933 }
934
935 if (pgm_info.code & PGM_PER) {
936 rc |= put_guest_lc(vcpu, pgm_info.per_code,
937 (u8 *) __LC_PER_CODE);
938 rc |= put_guest_lc(vcpu, pgm_info.per_atmid,
939 (u8 *)__LC_PER_ATMID);
940 rc |= put_guest_lc(vcpu, pgm_info.per_address,
941 (u64 *) __LC_PER_ADDRESS);
942 rc |= put_guest_lc(vcpu, pgm_info.per_access_id,
943 (u8 *) __LC_PER_ACCESS_ID);
944 }
945
946 if (nullifying && !(pgm_info.flags & KVM_S390_PGM_FLAGS_NO_REWIND))
947 kvm_s390_rewind_psw(vcpu, ilen);
948
949 /* bit 1+2 of the target are the ilc, so we can directly use ilen */
950 rc |= put_guest_lc(vcpu, ilen, (u16 *) __LC_PGM_ILC);
951 rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->gbea,
952 (u64 *) __LC_PGM_LAST_BREAK);
953 rc |= put_guest_lc(vcpu, pgm_info.code, (u16 *)__LC_PGM_CODE);
954 rc |= write_guest_lc(vcpu, __LC_PGM_OLD_PSW,
955 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
956 rc |= read_guest_lc(vcpu, __LC_PGM_NEW_PSW,
957 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
958 return rc ? -EFAULT : 0;
959 }
960
961 #define SCCB_MASK 0xFFFFFFF8
962 #define SCCB_EVENT_PENDING 0x3
963
write_sclp(struct kvm_vcpu * vcpu,u32 parm)964 static int write_sclp(struct kvm_vcpu *vcpu, u32 parm)
965 {
966 int rc;
967
968 if (kvm_s390_pv_cpu_get_handle(vcpu)) {
969 vcpu->arch.sie_block->iictl = IICTL_CODE_EXT;
970 vcpu->arch.sie_block->eic = EXT_IRQ_SERVICE_SIG;
971 vcpu->arch.sie_block->eiparams = parm;
972 return 0;
973 }
974
975 rc = put_guest_lc(vcpu, EXT_IRQ_SERVICE_SIG, (u16 *)__LC_EXT_INT_CODE);
976 rc |= put_guest_lc(vcpu, 0, (u16 *)__LC_EXT_CPU_ADDR);
977 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
978 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
979 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
980 &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
981 rc |= put_guest_lc(vcpu, parm,
982 (u32 *)__LC_EXT_PARAMS);
983
984 return rc ? -EFAULT : 0;
985 }
986
__deliver_service(struct kvm_vcpu * vcpu)987 static int __must_check __deliver_service(struct kvm_vcpu *vcpu)
988 {
989 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
990 struct kvm_s390_ext_info ext;
991
992 spin_lock(&fi->lock);
993 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs) ||
994 !(test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs))) {
995 spin_unlock(&fi->lock);
996 return 0;
997 }
998 ext = fi->srv_signal;
999 memset(&fi->srv_signal, 0, sizeof(ext));
1000 clear_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1001 clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
1002 if (kvm_s390_pv_cpu_is_protected(vcpu))
1003 set_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs);
1004 spin_unlock(&fi->lock);
1005
1006 VCPU_EVENT(vcpu, 4, "deliver: sclp parameter 0x%x",
1007 ext.ext_params);
1008 vcpu->stat.deliver_service_signal++;
1009 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
1010 ext.ext_params, 0);
1011
1012 return write_sclp(vcpu, ext.ext_params);
1013 }
1014
__deliver_service_ev(struct kvm_vcpu * vcpu)1015 static int __must_check __deliver_service_ev(struct kvm_vcpu *vcpu)
1016 {
1017 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
1018 struct kvm_s390_ext_info ext;
1019
1020 spin_lock(&fi->lock);
1021 if (!(test_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs))) {
1022 spin_unlock(&fi->lock);
1023 return 0;
1024 }
1025 ext = fi->srv_signal;
1026 /* only clear the event bits */
1027 fi->srv_signal.ext_params &= ~SCCB_EVENT_PENDING;
1028 clear_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
1029 spin_unlock(&fi->lock);
1030
1031 VCPU_EVENT(vcpu, 4, "%s", "deliver: sclp parameter event");
1032 vcpu->stat.deliver_service_signal++;
1033 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, KVM_S390_INT_SERVICE,
1034 ext.ext_params, 0);
1035
1036 return write_sclp(vcpu, ext.ext_params & SCCB_EVENT_PENDING);
1037 }
1038
__deliver_pfault_done(struct kvm_vcpu * vcpu)1039 static int __must_check __deliver_pfault_done(struct kvm_vcpu *vcpu)
1040 {
1041 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
1042 struct kvm_s390_interrupt_info *inti;
1043 int rc = 0;
1044
1045 spin_lock(&fi->lock);
1046 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_PFAULT],
1047 struct kvm_s390_interrupt_info,
1048 list);
1049 if (inti) {
1050 list_del(&inti->list);
1051 fi->counters[FIRQ_CNTR_PFAULT] -= 1;
1052 }
1053 if (list_empty(&fi->lists[FIRQ_LIST_PFAULT]))
1054 clear_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1055 spin_unlock(&fi->lock);
1056
1057 if (inti) {
1058 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1059 KVM_S390_INT_PFAULT_DONE, 0,
1060 inti->ext.ext_params2);
1061 VCPU_EVENT(vcpu, 4, "deliver: pfault done token 0x%llx",
1062 inti->ext.ext_params2);
1063
1064 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
1065 (u16 *)__LC_EXT_INT_CODE);
1066 rc |= put_guest_lc(vcpu, PFAULT_DONE,
1067 (u16 *)__LC_EXT_CPU_ADDR);
1068 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
1069 &vcpu->arch.sie_block->gpsw,
1070 sizeof(psw_t));
1071 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
1072 &vcpu->arch.sie_block->gpsw,
1073 sizeof(psw_t));
1074 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
1075 (u64 *)__LC_EXT_PARAMS2);
1076 kfree(inti);
1077 }
1078 return rc ? -EFAULT : 0;
1079 }
1080
__deliver_virtio(struct kvm_vcpu * vcpu)1081 static int __must_check __deliver_virtio(struct kvm_vcpu *vcpu)
1082 {
1083 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
1084 struct kvm_s390_interrupt_info *inti;
1085 int rc = 0;
1086
1087 spin_lock(&fi->lock);
1088 inti = list_first_entry_or_null(&fi->lists[FIRQ_LIST_VIRTIO],
1089 struct kvm_s390_interrupt_info,
1090 list);
1091 if (inti) {
1092 VCPU_EVENT(vcpu, 4,
1093 "deliver: virtio parm: 0x%x,parm64: 0x%llx",
1094 inti->ext.ext_params, inti->ext.ext_params2);
1095 vcpu->stat.deliver_virtio++;
1096 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1097 inti->type,
1098 inti->ext.ext_params,
1099 inti->ext.ext_params2);
1100 list_del(&inti->list);
1101 fi->counters[FIRQ_CNTR_VIRTIO] -= 1;
1102 }
1103 if (list_empty(&fi->lists[FIRQ_LIST_VIRTIO]))
1104 clear_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1105 spin_unlock(&fi->lock);
1106
1107 if (inti) {
1108 rc = put_guest_lc(vcpu, EXT_IRQ_CP_SERVICE,
1109 (u16 *)__LC_EXT_INT_CODE);
1110 rc |= put_guest_lc(vcpu, VIRTIO_PARAM,
1111 (u16 *)__LC_EXT_CPU_ADDR);
1112 rc |= write_guest_lc(vcpu, __LC_EXT_OLD_PSW,
1113 &vcpu->arch.sie_block->gpsw,
1114 sizeof(psw_t));
1115 rc |= read_guest_lc(vcpu, __LC_EXT_NEW_PSW,
1116 &vcpu->arch.sie_block->gpsw,
1117 sizeof(psw_t));
1118 rc |= put_guest_lc(vcpu, inti->ext.ext_params,
1119 (u32 *)__LC_EXT_PARAMS);
1120 rc |= put_guest_lc(vcpu, inti->ext.ext_params2,
1121 (u64 *)__LC_EXT_PARAMS2);
1122 kfree(inti);
1123 }
1124 return rc ? -EFAULT : 0;
1125 }
1126
__do_deliver_io(struct kvm_vcpu * vcpu,struct kvm_s390_io_info * io)1127 static int __do_deliver_io(struct kvm_vcpu *vcpu, struct kvm_s390_io_info *io)
1128 {
1129 int rc;
1130
1131 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
1132 vcpu->arch.sie_block->iictl = IICTL_CODE_IO;
1133 vcpu->arch.sie_block->subchannel_id = io->subchannel_id;
1134 vcpu->arch.sie_block->subchannel_nr = io->subchannel_nr;
1135 vcpu->arch.sie_block->io_int_parm = io->io_int_parm;
1136 vcpu->arch.sie_block->io_int_word = io->io_int_word;
1137 return 0;
1138 }
1139
1140 rc = put_guest_lc(vcpu, io->subchannel_id, (u16 *)__LC_SUBCHANNEL_ID);
1141 rc |= put_guest_lc(vcpu, io->subchannel_nr, (u16 *)__LC_SUBCHANNEL_NR);
1142 rc |= put_guest_lc(vcpu, io->io_int_parm, (u32 *)__LC_IO_INT_PARM);
1143 rc |= put_guest_lc(vcpu, io->io_int_word, (u32 *)__LC_IO_INT_WORD);
1144 rc |= write_guest_lc(vcpu, __LC_IO_OLD_PSW,
1145 &vcpu->arch.sie_block->gpsw,
1146 sizeof(psw_t));
1147 rc |= read_guest_lc(vcpu, __LC_IO_NEW_PSW,
1148 &vcpu->arch.sie_block->gpsw,
1149 sizeof(psw_t));
1150 return rc ? -EFAULT : 0;
1151 }
1152
__deliver_io(struct kvm_vcpu * vcpu,unsigned long irq_type)1153 static int __must_check __deliver_io(struct kvm_vcpu *vcpu,
1154 unsigned long irq_type)
1155 {
1156 struct list_head *isc_list;
1157 struct kvm_s390_float_interrupt *fi;
1158 struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
1159 struct kvm_s390_interrupt_info *inti = NULL;
1160 struct kvm_s390_io_info io;
1161 u32 isc;
1162 int rc = 0;
1163
1164 fi = &vcpu->kvm->arch.float_int;
1165
1166 spin_lock(&fi->lock);
1167 isc = irq_type_to_isc(irq_type);
1168 isc_list = &fi->lists[isc];
1169 inti = list_first_entry_or_null(isc_list,
1170 struct kvm_s390_interrupt_info,
1171 list);
1172 if (inti) {
1173 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1174 VCPU_EVENT(vcpu, 4, "%s", "deliver: I/O (AI)");
1175 else
1176 VCPU_EVENT(vcpu, 4, "deliver: I/O %x ss %x schid %04x",
1177 inti->io.subchannel_id >> 8,
1178 inti->io.subchannel_id >> 1 & 0x3,
1179 inti->io.subchannel_nr);
1180
1181 vcpu->stat.deliver_io++;
1182 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1183 inti->type,
1184 ((__u32)inti->io.subchannel_id << 16) |
1185 inti->io.subchannel_nr,
1186 ((__u64)inti->io.io_int_parm << 32) |
1187 inti->io.io_int_word);
1188 list_del(&inti->list);
1189 fi->counters[FIRQ_CNTR_IO] -= 1;
1190 }
1191 if (list_empty(isc_list))
1192 clear_bit(irq_type, &fi->pending_irqs);
1193 spin_unlock(&fi->lock);
1194
1195 if (inti) {
1196 rc = __do_deliver_io(vcpu, &(inti->io));
1197 kfree(inti);
1198 goto out;
1199 }
1200
1201 if (gi->origin && gisa_tac_ipm_gisc(gi->origin, isc)) {
1202 /*
1203 * in case an adapter interrupt was not delivered
1204 * in SIE context KVM will handle the delivery
1205 */
1206 VCPU_EVENT(vcpu, 4, "%s isc %u", "deliver: I/O (AI/gisa)", isc);
1207 memset(&io, 0, sizeof(io));
1208 io.io_int_word = isc_to_int_word(isc);
1209 vcpu->stat.deliver_io++;
1210 trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id,
1211 KVM_S390_INT_IO(1, 0, 0, 0),
1212 ((__u32)io.subchannel_id << 16) |
1213 io.subchannel_nr,
1214 ((__u64)io.io_int_parm << 32) |
1215 io.io_int_word);
1216 rc = __do_deliver_io(vcpu, &io);
1217 }
1218 out:
1219 return rc;
1220 }
1221
1222 /* Check whether an external call is pending (deliverable or not) */
kvm_s390_ext_call_pending(struct kvm_vcpu * vcpu)1223 int kvm_s390_ext_call_pending(struct kvm_vcpu *vcpu)
1224 {
1225 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1226
1227 if (!sclp.has_sigpif)
1228 return test_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs);
1229
1230 return sca_ext_call_pending(vcpu, NULL);
1231 }
1232
kvm_s390_vcpu_has_irq(struct kvm_vcpu * vcpu,int exclude_stop)1233 int kvm_s390_vcpu_has_irq(struct kvm_vcpu *vcpu, int exclude_stop)
1234 {
1235 if (deliverable_irqs(vcpu))
1236 return 1;
1237
1238 if (kvm_cpu_has_pending_timer(vcpu))
1239 return 1;
1240
1241 /* external call pending and deliverable */
1242 if (kvm_s390_ext_call_pending(vcpu) &&
1243 !psw_extint_disabled(vcpu) &&
1244 (vcpu->arch.sie_block->gcr[0] & CR0_EXTERNAL_CALL_SUBMASK))
1245 return 1;
1246
1247 if (!exclude_stop && kvm_s390_is_stop_irq_pending(vcpu))
1248 return 1;
1249 return 0;
1250 }
1251
kvm_cpu_has_pending_timer(struct kvm_vcpu * vcpu)1252 int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
1253 {
1254 return ckc_irq_pending(vcpu) || cpu_timer_irq_pending(vcpu);
1255 }
1256
__calculate_sltime(struct kvm_vcpu * vcpu)1257 static u64 __calculate_sltime(struct kvm_vcpu *vcpu)
1258 {
1259 const u64 now = kvm_s390_get_tod_clock_fast(vcpu->kvm);
1260 const u64 ckc = vcpu->arch.sie_block->ckc;
1261 u64 cputm, sltime = 0;
1262
1263 if (ckc_interrupts_enabled(vcpu)) {
1264 if (vcpu->arch.sie_block->gcr[0] & CR0_CLOCK_COMPARATOR_SIGN) {
1265 if ((s64)now < (s64)ckc)
1266 sltime = tod_to_ns((s64)ckc - (s64)now);
1267 } else if (now < ckc) {
1268 sltime = tod_to_ns(ckc - now);
1269 }
1270 /* already expired */
1271 if (!sltime)
1272 return 0;
1273 if (cpu_timer_interrupts_enabled(vcpu)) {
1274 cputm = kvm_s390_get_cpu_timer(vcpu);
1275 /* already expired? */
1276 if (cputm >> 63)
1277 return 0;
1278 return min_t(u64, sltime, tod_to_ns(cputm));
1279 }
1280 } else if (cpu_timer_interrupts_enabled(vcpu)) {
1281 sltime = kvm_s390_get_cpu_timer(vcpu);
1282 /* already expired? */
1283 if (sltime >> 63)
1284 return 0;
1285 }
1286 return sltime;
1287 }
1288
kvm_s390_handle_wait(struct kvm_vcpu * vcpu)1289 int kvm_s390_handle_wait(struct kvm_vcpu *vcpu)
1290 {
1291 struct kvm_s390_gisa_interrupt *gi = &vcpu->kvm->arch.gisa_int;
1292 u64 sltime;
1293
1294 vcpu->stat.exit_wait_state++;
1295
1296 /* fast path */
1297 if (kvm_arch_vcpu_runnable(vcpu))
1298 return 0;
1299
1300 if (psw_interrupts_disabled(vcpu)) {
1301 VCPU_EVENT(vcpu, 3, "%s", "disabled wait");
1302 return -EOPNOTSUPP; /* disabled wait */
1303 }
1304
1305 if (gi->origin &&
1306 (gisa_get_ipm_or_restore_iam(gi) &
1307 vcpu->arch.sie_block->gcr[6] >> 24))
1308 return 0;
1309
1310 if (!ckc_interrupts_enabled(vcpu) &&
1311 !cpu_timer_interrupts_enabled(vcpu)) {
1312 VCPU_EVENT(vcpu, 3, "%s", "enabled wait w/o timer");
1313 __set_cpu_idle(vcpu);
1314 goto no_timer;
1315 }
1316
1317 sltime = __calculate_sltime(vcpu);
1318 if (!sltime)
1319 return 0;
1320
1321 __set_cpu_idle(vcpu);
1322 hrtimer_start(&vcpu->arch.ckc_timer, sltime, HRTIMER_MODE_REL);
1323 VCPU_EVENT(vcpu, 4, "enabled wait: %llu ns", sltime);
1324 no_timer:
1325 kvm_vcpu_srcu_read_unlock(vcpu);
1326 vcpu->kvm->arch.float_int.last_sleep_cpu = vcpu->vcpu_idx;
1327 kvm_vcpu_halt(vcpu);
1328 vcpu->valid_wakeup = false;
1329 __unset_cpu_idle(vcpu);
1330 kvm_vcpu_srcu_read_lock(vcpu);
1331
1332 hrtimer_cancel(&vcpu->arch.ckc_timer);
1333 return 0;
1334 }
1335
kvm_s390_vcpu_wakeup(struct kvm_vcpu * vcpu)1336 void kvm_s390_vcpu_wakeup(struct kvm_vcpu *vcpu)
1337 {
1338 vcpu->valid_wakeup = true;
1339 kvm_vcpu_wake_up(vcpu);
1340
1341 /*
1342 * The VCPU might not be sleeping but rather executing VSIE. Let's
1343 * kick it, so it leaves the SIE to process the request.
1344 */
1345 kvm_s390_vsie_kick(vcpu);
1346 }
1347
kvm_s390_idle_wakeup(struct hrtimer * timer)1348 enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer)
1349 {
1350 struct kvm_vcpu *vcpu;
1351 u64 sltime;
1352
1353 vcpu = container_of(timer, struct kvm_vcpu, arch.ckc_timer);
1354 sltime = __calculate_sltime(vcpu);
1355
1356 /*
1357 * If the monotonic clock runs faster than the tod clock we might be
1358 * woken up too early and have to go back to sleep to avoid deadlocks.
1359 */
1360 if (sltime && hrtimer_forward_now(timer, ns_to_ktime(sltime)))
1361 return HRTIMER_RESTART;
1362 kvm_s390_vcpu_wakeup(vcpu);
1363 return HRTIMER_NORESTART;
1364 }
1365
kvm_s390_clear_local_irqs(struct kvm_vcpu * vcpu)1366 void kvm_s390_clear_local_irqs(struct kvm_vcpu *vcpu)
1367 {
1368 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1369
1370 spin_lock(&li->lock);
1371 li->pending_irqs = 0;
1372 bitmap_zero(li->sigp_emerg_pending, KVM_MAX_VCPUS);
1373 memset(&li->irq, 0, sizeof(li->irq));
1374 spin_unlock(&li->lock);
1375
1376 sca_clear_ext_call(vcpu);
1377 }
1378
kvm_s390_deliver_pending_interrupts(struct kvm_vcpu * vcpu)1379 int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
1380 {
1381 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1382 int rc = 0;
1383 bool delivered = false;
1384 unsigned long irq_type;
1385 unsigned long irqs;
1386
1387 __reset_intercept_indicators(vcpu);
1388
1389 /* pending ckc conditions might have been invalidated */
1390 clear_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1391 if (ckc_irq_pending(vcpu))
1392 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1393
1394 /* pending cpu timer conditions might have been invalidated */
1395 clear_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1396 if (cpu_timer_irq_pending(vcpu))
1397 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1398
1399 while ((irqs = deliverable_irqs(vcpu)) && !rc) {
1400 /* bits are in the reverse order of interrupt priority */
1401 irq_type = find_last_bit(&irqs, IRQ_PEND_COUNT);
1402 switch (irq_type) {
1403 case IRQ_PEND_IO_ISC_0:
1404 case IRQ_PEND_IO_ISC_1:
1405 case IRQ_PEND_IO_ISC_2:
1406 case IRQ_PEND_IO_ISC_3:
1407 case IRQ_PEND_IO_ISC_4:
1408 case IRQ_PEND_IO_ISC_5:
1409 case IRQ_PEND_IO_ISC_6:
1410 case IRQ_PEND_IO_ISC_7:
1411 rc = __deliver_io(vcpu, irq_type);
1412 break;
1413 case IRQ_PEND_MCHK_EX:
1414 case IRQ_PEND_MCHK_REP:
1415 rc = __deliver_machine_check(vcpu);
1416 break;
1417 case IRQ_PEND_PROG:
1418 rc = __deliver_prog(vcpu);
1419 break;
1420 case IRQ_PEND_EXT_EMERGENCY:
1421 rc = __deliver_emergency_signal(vcpu);
1422 break;
1423 case IRQ_PEND_EXT_EXTERNAL:
1424 rc = __deliver_external_call(vcpu);
1425 break;
1426 case IRQ_PEND_EXT_CLOCK_COMP:
1427 rc = __deliver_ckc(vcpu);
1428 break;
1429 case IRQ_PEND_EXT_CPU_TIMER:
1430 rc = __deliver_cpu_timer(vcpu);
1431 break;
1432 case IRQ_PEND_RESTART:
1433 rc = __deliver_restart(vcpu);
1434 break;
1435 case IRQ_PEND_SET_PREFIX:
1436 rc = __deliver_set_prefix(vcpu);
1437 break;
1438 case IRQ_PEND_PFAULT_INIT:
1439 rc = __deliver_pfault_init(vcpu);
1440 break;
1441 case IRQ_PEND_EXT_SERVICE:
1442 rc = __deliver_service(vcpu);
1443 break;
1444 case IRQ_PEND_EXT_SERVICE_EV:
1445 rc = __deliver_service_ev(vcpu);
1446 break;
1447 case IRQ_PEND_PFAULT_DONE:
1448 rc = __deliver_pfault_done(vcpu);
1449 break;
1450 case IRQ_PEND_VIRTIO:
1451 rc = __deliver_virtio(vcpu);
1452 break;
1453 default:
1454 WARN_ONCE(1, "Unknown pending irq type %ld", irq_type);
1455 clear_bit(irq_type, &li->pending_irqs);
1456 }
1457 delivered |= !rc;
1458 }
1459
1460 /*
1461 * We delivered at least one interrupt and modified the PC. Force a
1462 * singlestep event now.
1463 */
1464 if (delivered && guestdbg_sstep_enabled(vcpu)) {
1465 struct kvm_debug_exit_arch *debug_exit = &vcpu->run->debug.arch;
1466
1467 debug_exit->addr = vcpu->arch.sie_block->gpsw.addr;
1468 debug_exit->type = KVM_SINGLESTEP;
1469 vcpu->guest_debug |= KVM_GUESTDBG_EXIT_PENDING;
1470 }
1471
1472 set_intercept_indicators(vcpu);
1473
1474 return rc;
1475 }
1476
__inject_prog(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1477 static int __inject_prog(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1478 {
1479 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1480
1481 vcpu->stat.inject_program++;
1482 VCPU_EVENT(vcpu, 3, "inject: program irq code 0x%x", irq->u.pgm.code);
1483 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_PROGRAM_INT,
1484 irq->u.pgm.code, 0);
1485
1486 if (!(irq->u.pgm.flags & KVM_S390_PGM_FLAGS_ILC_VALID)) {
1487 /* auto detection if no valid ILC was given */
1488 irq->u.pgm.flags &= ~KVM_S390_PGM_FLAGS_ILC_MASK;
1489 irq->u.pgm.flags |= kvm_s390_get_ilen(vcpu);
1490 irq->u.pgm.flags |= KVM_S390_PGM_FLAGS_ILC_VALID;
1491 }
1492
1493 if (irq->u.pgm.code == PGM_PER) {
1494 li->irq.pgm.code |= PGM_PER;
1495 li->irq.pgm.flags = irq->u.pgm.flags;
1496 /* only modify PER related information */
1497 li->irq.pgm.per_address = irq->u.pgm.per_address;
1498 li->irq.pgm.per_code = irq->u.pgm.per_code;
1499 li->irq.pgm.per_atmid = irq->u.pgm.per_atmid;
1500 li->irq.pgm.per_access_id = irq->u.pgm.per_access_id;
1501 } else if (!(irq->u.pgm.code & PGM_PER)) {
1502 li->irq.pgm.code = (li->irq.pgm.code & PGM_PER) |
1503 irq->u.pgm.code;
1504 li->irq.pgm.flags = irq->u.pgm.flags;
1505 /* only modify non-PER information */
1506 li->irq.pgm.trans_exc_code = irq->u.pgm.trans_exc_code;
1507 li->irq.pgm.mon_code = irq->u.pgm.mon_code;
1508 li->irq.pgm.data_exc_code = irq->u.pgm.data_exc_code;
1509 li->irq.pgm.mon_class_nr = irq->u.pgm.mon_class_nr;
1510 li->irq.pgm.exc_access_id = irq->u.pgm.exc_access_id;
1511 li->irq.pgm.op_access_id = irq->u.pgm.op_access_id;
1512 } else {
1513 li->irq.pgm = irq->u.pgm;
1514 }
1515 set_bit(IRQ_PEND_PROG, &li->pending_irqs);
1516 return 0;
1517 }
1518
__inject_pfault_init(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1519 static int __inject_pfault_init(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1520 {
1521 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1522
1523 vcpu->stat.inject_pfault_init++;
1524 VCPU_EVENT(vcpu, 4, "inject: pfault init parameter block at 0x%llx",
1525 irq->u.ext.ext_params2);
1526 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_PFAULT_INIT,
1527 irq->u.ext.ext_params,
1528 irq->u.ext.ext_params2);
1529
1530 li->irq.ext = irq->u.ext;
1531 set_bit(IRQ_PEND_PFAULT_INIT, &li->pending_irqs);
1532 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1533 return 0;
1534 }
1535
__inject_extcall(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1536 static int __inject_extcall(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1537 {
1538 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1539 struct kvm_s390_extcall_info *extcall = &li->irq.extcall;
1540 uint16_t src_id = irq->u.extcall.code;
1541
1542 vcpu->stat.inject_external_call++;
1543 VCPU_EVENT(vcpu, 4, "inject: external call source-cpu:%u",
1544 src_id);
1545 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EXTERNAL_CALL,
1546 src_id, 0);
1547
1548 /* sending vcpu invalid */
1549 if (kvm_get_vcpu_by_id(vcpu->kvm, src_id) == NULL)
1550 return -EINVAL;
1551
1552 if (sclp.has_sigpif && !kvm_s390_pv_cpu_get_handle(vcpu))
1553 return sca_inject_ext_call(vcpu, src_id);
1554
1555 if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs))
1556 return -EBUSY;
1557 *extcall = irq->u.extcall;
1558 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1559 return 0;
1560 }
1561
__inject_set_prefix(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1562 static int __inject_set_prefix(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1563 {
1564 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1565 struct kvm_s390_prefix_info *prefix = &li->irq.prefix;
1566
1567 vcpu->stat.inject_set_prefix++;
1568 VCPU_EVENT(vcpu, 3, "inject: set prefix to %x",
1569 irq->u.prefix.address);
1570 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_SET_PREFIX,
1571 irq->u.prefix.address, 0);
1572
1573 if (!is_vcpu_stopped(vcpu))
1574 return -EBUSY;
1575
1576 *prefix = irq->u.prefix;
1577 set_bit(IRQ_PEND_SET_PREFIX, &li->pending_irqs);
1578 return 0;
1579 }
1580
1581 #define KVM_S390_STOP_SUPP_FLAGS (KVM_S390_STOP_FLAG_STORE_STATUS)
__inject_sigp_stop(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1582 static int __inject_sigp_stop(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1583 {
1584 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1585 struct kvm_s390_stop_info *stop = &li->irq.stop;
1586 int rc = 0;
1587
1588 vcpu->stat.inject_stop_signal++;
1589 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_SIGP_STOP, 0, 0);
1590
1591 if (irq->u.stop.flags & ~KVM_S390_STOP_SUPP_FLAGS)
1592 return -EINVAL;
1593
1594 if (is_vcpu_stopped(vcpu)) {
1595 if (irq->u.stop.flags & KVM_S390_STOP_FLAG_STORE_STATUS)
1596 rc = kvm_s390_store_status_unloaded(vcpu,
1597 KVM_S390_STORE_STATUS_NOADDR);
1598 return rc;
1599 }
1600
1601 if (test_and_set_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs))
1602 return -EBUSY;
1603 stop->flags = irq->u.stop.flags;
1604 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
1605 return 0;
1606 }
1607
__inject_sigp_restart(struct kvm_vcpu * vcpu)1608 static int __inject_sigp_restart(struct kvm_vcpu *vcpu)
1609 {
1610 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1611
1612 vcpu->stat.inject_restart++;
1613 VCPU_EVENT(vcpu, 3, "%s", "inject: restart int");
1614 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_RESTART, 0, 0);
1615
1616 set_bit(IRQ_PEND_RESTART, &li->pending_irqs);
1617 return 0;
1618 }
1619
__inject_sigp_emergency(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1620 static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
1621 struct kvm_s390_irq *irq)
1622 {
1623 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1624
1625 vcpu->stat.inject_emergency_signal++;
1626 VCPU_EVENT(vcpu, 4, "inject: emergency from cpu %u",
1627 irq->u.emerg.code);
1628 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_EMERGENCY,
1629 irq->u.emerg.code, 0);
1630
1631 /* sending vcpu invalid */
1632 if (kvm_get_vcpu_by_id(vcpu->kvm, irq->u.emerg.code) == NULL)
1633 return -EINVAL;
1634
1635 set_bit(irq->u.emerg.code, li->sigp_emerg_pending);
1636 set_bit(IRQ_PEND_EXT_EMERGENCY, &li->pending_irqs);
1637 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1638 return 0;
1639 }
1640
__inject_mchk(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)1641 static int __inject_mchk(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
1642 {
1643 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1644 struct kvm_s390_mchk_info *mchk = &li->irq.mchk;
1645
1646 vcpu->stat.inject_mchk++;
1647 VCPU_EVENT(vcpu, 3, "inject: machine check mcic 0x%llx",
1648 irq->u.mchk.mcic);
1649 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_MCHK, 0,
1650 irq->u.mchk.mcic);
1651
1652 /*
1653 * Because repressible machine checks can be indicated along with
1654 * exigent machine checks (PoP, Chapter 11, Interruption action)
1655 * we need to combine cr14, mcic and external damage code.
1656 * Failing storage address and the logout area should not be or'ed
1657 * together, we just indicate the last occurrence of the corresponding
1658 * machine check
1659 */
1660 mchk->cr14 |= irq->u.mchk.cr14;
1661 mchk->mcic |= irq->u.mchk.mcic;
1662 mchk->ext_damage_code |= irq->u.mchk.ext_damage_code;
1663 mchk->failing_storage_address = irq->u.mchk.failing_storage_address;
1664 memcpy(&mchk->fixed_logout, &irq->u.mchk.fixed_logout,
1665 sizeof(mchk->fixed_logout));
1666 if (mchk->mcic & MCHK_EX_MASK)
1667 set_bit(IRQ_PEND_MCHK_EX, &li->pending_irqs);
1668 else if (mchk->mcic & MCHK_REP_MASK)
1669 set_bit(IRQ_PEND_MCHK_REP, &li->pending_irqs);
1670 return 0;
1671 }
1672
__inject_ckc(struct kvm_vcpu * vcpu)1673 static int __inject_ckc(struct kvm_vcpu *vcpu)
1674 {
1675 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1676
1677 vcpu->stat.inject_ckc++;
1678 VCPU_EVENT(vcpu, 3, "%s", "inject: clock comparator external");
1679 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CLOCK_COMP,
1680 0, 0);
1681
1682 set_bit(IRQ_PEND_EXT_CLOCK_COMP, &li->pending_irqs);
1683 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1684 return 0;
1685 }
1686
__inject_cpu_timer(struct kvm_vcpu * vcpu)1687 static int __inject_cpu_timer(struct kvm_vcpu *vcpu)
1688 {
1689 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
1690
1691 vcpu->stat.inject_cputm++;
1692 VCPU_EVENT(vcpu, 3, "%s", "inject: cpu timer external");
1693 trace_kvm_s390_inject_vcpu(vcpu->vcpu_id, KVM_S390_INT_CPU_TIMER,
1694 0, 0);
1695
1696 set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
1697 kvm_s390_set_cpuflags(vcpu, CPUSTAT_EXT_INT);
1698 return 0;
1699 }
1700
get_io_int(struct kvm * kvm,int isc,u32 schid)1701 static struct kvm_s390_interrupt_info *get_io_int(struct kvm *kvm,
1702 int isc, u32 schid)
1703 {
1704 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1705 struct list_head *isc_list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1706 struct kvm_s390_interrupt_info *iter;
1707 u16 id = (schid & 0xffff0000U) >> 16;
1708 u16 nr = schid & 0x0000ffffU;
1709
1710 spin_lock(&fi->lock);
1711 list_for_each_entry(iter, isc_list, list) {
1712 if (schid && (id != iter->io.subchannel_id ||
1713 nr != iter->io.subchannel_nr))
1714 continue;
1715 /* found an appropriate entry */
1716 list_del_init(&iter->list);
1717 fi->counters[FIRQ_CNTR_IO] -= 1;
1718 if (list_empty(isc_list))
1719 clear_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1720 spin_unlock(&fi->lock);
1721 return iter;
1722 }
1723 spin_unlock(&fi->lock);
1724 return NULL;
1725 }
1726
get_top_io_int(struct kvm * kvm,u64 isc_mask,u32 schid)1727 static struct kvm_s390_interrupt_info *get_top_io_int(struct kvm *kvm,
1728 u64 isc_mask, u32 schid)
1729 {
1730 struct kvm_s390_interrupt_info *inti = NULL;
1731 int isc;
1732
1733 for (isc = 0; isc <= MAX_ISC && !inti; isc++) {
1734 if (isc_mask & isc_to_isc_bits(isc))
1735 inti = get_io_int(kvm, isc, schid);
1736 }
1737 return inti;
1738 }
1739
get_top_gisa_isc(struct kvm * kvm,u64 isc_mask,u32 schid)1740 static int get_top_gisa_isc(struct kvm *kvm, u64 isc_mask, u32 schid)
1741 {
1742 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1743 unsigned long active_mask;
1744 int isc;
1745
1746 if (schid)
1747 goto out;
1748 if (!gi->origin)
1749 goto out;
1750
1751 active_mask = (isc_mask & gisa_get_ipm(gi->origin) << 24) << 32;
1752 while (active_mask) {
1753 isc = __fls(active_mask) ^ (BITS_PER_LONG - 1);
1754 if (gisa_tac_ipm_gisc(gi->origin, isc))
1755 return isc;
1756 clear_bit_inv(isc, &active_mask);
1757 }
1758 out:
1759 return -EINVAL;
1760 }
1761
1762 /*
1763 * Dequeue and return an I/O interrupt matching any of the interruption
1764 * subclasses as designated by the isc mask in cr6 and the schid (if != 0).
1765 * Take into account the interrupts pending in the interrupt list and in GISA.
1766 *
1767 * Note that for a guest that does not enable I/O interrupts
1768 * but relies on TPI, a flood of classic interrupts may starve
1769 * out adapter interrupts on the same isc. Linux does not do
1770 * that, and it is possible to work around the issue by configuring
1771 * different iscs for classic and adapter interrupts in the guest,
1772 * but we may want to revisit this in the future.
1773 */
kvm_s390_get_io_int(struct kvm * kvm,u64 isc_mask,u32 schid)1774 struct kvm_s390_interrupt_info *kvm_s390_get_io_int(struct kvm *kvm,
1775 u64 isc_mask, u32 schid)
1776 {
1777 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1778 struct kvm_s390_interrupt_info *inti, *tmp_inti;
1779 int isc;
1780
1781 inti = get_top_io_int(kvm, isc_mask, schid);
1782
1783 isc = get_top_gisa_isc(kvm, isc_mask, schid);
1784 if (isc < 0)
1785 /* no AI in GISA */
1786 goto out;
1787
1788 if (!inti)
1789 /* AI in GISA but no classical IO int */
1790 goto gisa_out;
1791
1792 /* both types of interrupts present */
1793 if (int_word_to_isc(inti->io.io_int_word) <= isc) {
1794 /* classical IO int with higher priority */
1795 gisa_set_ipm_gisc(gi->origin, isc);
1796 goto out;
1797 }
1798 gisa_out:
1799 tmp_inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
1800 if (tmp_inti) {
1801 tmp_inti->type = KVM_S390_INT_IO(1, 0, 0, 0);
1802 tmp_inti->io.io_int_word = isc_to_int_word(isc);
1803 if (inti)
1804 kvm_s390_reinject_io_int(kvm, inti);
1805 inti = tmp_inti;
1806 } else
1807 gisa_set_ipm_gisc(gi->origin, isc);
1808 out:
1809 return inti;
1810 }
1811
__inject_service(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1812 static int __inject_service(struct kvm *kvm,
1813 struct kvm_s390_interrupt_info *inti)
1814 {
1815 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1816
1817 kvm->stat.inject_service_signal++;
1818 spin_lock(&fi->lock);
1819 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_EVENT_PENDING;
1820
1821 /* We always allow events, track them separately from the sccb ints */
1822 if (fi->srv_signal.ext_params & SCCB_EVENT_PENDING)
1823 set_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs);
1824
1825 /*
1826 * Early versions of the QEMU s390 bios will inject several
1827 * service interrupts after another without handling a
1828 * condition code indicating busy.
1829 * We will silently ignore those superfluous sccb values.
1830 * A future version of QEMU will take care of serialization
1831 * of servc requests
1832 */
1833 if (fi->srv_signal.ext_params & SCCB_MASK)
1834 goto out;
1835 fi->srv_signal.ext_params |= inti->ext.ext_params & SCCB_MASK;
1836 set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
1837 out:
1838 spin_unlock(&fi->lock);
1839 kfree(inti);
1840 return 0;
1841 }
1842
__inject_virtio(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1843 static int __inject_virtio(struct kvm *kvm,
1844 struct kvm_s390_interrupt_info *inti)
1845 {
1846 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1847
1848 kvm->stat.inject_virtio++;
1849 spin_lock(&fi->lock);
1850 if (fi->counters[FIRQ_CNTR_VIRTIO] >= KVM_S390_MAX_VIRTIO_IRQS) {
1851 spin_unlock(&fi->lock);
1852 return -EBUSY;
1853 }
1854 fi->counters[FIRQ_CNTR_VIRTIO] += 1;
1855 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_VIRTIO]);
1856 set_bit(IRQ_PEND_VIRTIO, &fi->pending_irqs);
1857 spin_unlock(&fi->lock);
1858 return 0;
1859 }
1860
__inject_pfault_done(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1861 static int __inject_pfault_done(struct kvm *kvm,
1862 struct kvm_s390_interrupt_info *inti)
1863 {
1864 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1865
1866 kvm->stat.inject_pfault_done++;
1867 spin_lock(&fi->lock);
1868 if (fi->counters[FIRQ_CNTR_PFAULT] >=
1869 (ASYNC_PF_PER_VCPU * KVM_MAX_VCPUS)) {
1870 spin_unlock(&fi->lock);
1871 return -EBUSY;
1872 }
1873 fi->counters[FIRQ_CNTR_PFAULT] += 1;
1874 list_add_tail(&inti->list, &fi->lists[FIRQ_LIST_PFAULT]);
1875 set_bit(IRQ_PEND_PFAULT_DONE, &fi->pending_irqs);
1876 spin_unlock(&fi->lock);
1877 return 0;
1878 }
1879
1880 #define CR_PENDING_SUBCLASS 28
__inject_float_mchk(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1881 static int __inject_float_mchk(struct kvm *kvm,
1882 struct kvm_s390_interrupt_info *inti)
1883 {
1884 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
1885
1886 kvm->stat.inject_float_mchk++;
1887 spin_lock(&fi->lock);
1888 fi->mchk.cr14 |= inti->mchk.cr14 & (1UL << CR_PENDING_SUBCLASS);
1889 fi->mchk.mcic |= inti->mchk.mcic;
1890 set_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs);
1891 spin_unlock(&fi->lock);
1892 kfree(inti);
1893 return 0;
1894 }
1895
__inject_io(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1896 static int __inject_io(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1897 {
1898 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
1899 struct kvm_s390_float_interrupt *fi;
1900 struct list_head *list;
1901 int isc;
1902
1903 kvm->stat.inject_io++;
1904 isc = int_word_to_isc(inti->io.io_int_word);
1905
1906 /*
1907 * We do not use the lock checking variant as this is just a
1908 * performance optimization and we do not hold the lock here.
1909 * This is ok as the code will pick interrupts from both "lists"
1910 * for delivery.
1911 */
1912 if (gi->origin && inti->type & KVM_S390_INT_IO_AI_MASK) {
1913 VM_EVENT(kvm, 4, "%s isc %1u", "inject: I/O (AI/gisa)", isc);
1914 gisa_set_ipm_gisc(gi->origin, isc);
1915 kfree(inti);
1916 return 0;
1917 }
1918
1919 fi = &kvm->arch.float_int;
1920 spin_lock(&fi->lock);
1921 if (fi->counters[FIRQ_CNTR_IO] >= KVM_S390_MAX_FLOAT_IRQS) {
1922 spin_unlock(&fi->lock);
1923 return -EBUSY;
1924 }
1925 fi->counters[FIRQ_CNTR_IO] += 1;
1926
1927 if (inti->type & KVM_S390_INT_IO_AI_MASK)
1928 VM_EVENT(kvm, 4, "%s", "inject: I/O (AI)");
1929 else
1930 VM_EVENT(kvm, 4, "inject: I/O %x ss %x schid %04x",
1931 inti->io.subchannel_id >> 8,
1932 inti->io.subchannel_id >> 1 & 0x3,
1933 inti->io.subchannel_nr);
1934 list = &fi->lists[FIRQ_LIST_IO_ISC_0 + isc];
1935 list_add_tail(&inti->list, list);
1936 set_bit(isc_to_irq_type(isc), &fi->pending_irqs);
1937 spin_unlock(&fi->lock);
1938 return 0;
1939 }
1940
1941 /*
1942 * Find a destination VCPU for a floating irq and kick it.
1943 */
__floating_irq_kick(struct kvm * kvm,u64 type)1944 static void __floating_irq_kick(struct kvm *kvm, u64 type)
1945 {
1946 struct kvm_vcpu *dst_vcpu;
1947 int sigcpu, online_vcpus, nr_tries = 0;
1948
1949 online_vcpus = atomic_read(&kvm->online_vcpus);
1950 if (!online_vcpus)
1951 return;
1952
1953 for (sigcpu = kvm->arch.float_int.last_sleep_cpu; ; sigcpu++) {
1954 sigcpu %= online_vcpus;
1955 dst_vcpu = kvm_get_vcpu(kvm, sigcpu);
1956 if (!is_vcpu_stopped(dst_vcpu))
1957 break;
1958 /* avoid endless loops if all vcpus are stopped */
1959 if (nr_tries++ >= online_vcpus)
1960 return;
1961 }
1962
1963 /* make the VCPU drop out of the SIE, or wake it up if sleeping */
1964 switch (type) {
1965 case KVM_S390_MCHK:
1966 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_STOP_INT);
1967 break;
1968 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
1969 if (!(type & KVM_S390_INT_IO_AI_MASK &&
1970 kvm->arch.gisa_int.origin) ||
1971 kvm_s390_pv_cpu_get_handle(dst_vcpu))
1972 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_IO_INT);
1973 break;
1974 default:
1975 kvm_s390_set_cpuflags(dst_vcpu, CPUSTAT_EXT_INT);
1976 break;
1977 }
1978 kvm_s390_vcpu_wakeup(dst_vcpu);
1979 }
1980
__inject_vm(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)1981 static int __inject_vm(struct kvm *kvm, struct kvm_s390_interrupt_info *inti)
1982 {
1983 u64 type = READ_ONCE(inti->type);
1984 int rc;
1985
1986 switch (type) {
1987 case KVM_S390_MCHK:
1988 rc = __inject_float_mchk(kvm, inti);
1989 break;
1990 case KVM_S390_INT_VIRTIO:
1991 rc = __inject_virtio(kvm, inti);
1992 break;
1993 case KVM_S390_INT_SERVICE:
1994 rc = __inject_service(kvm, inti);
1995 break;
1996 case KVM_S390_INT_PFAULT_DONE:
1997 rc = __inject_pfault_done(kvm, inti);
1998 break;
1999 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2000 rc = __inject_io(kvm, inti);
2001 break;
2002 default:
2003 rc = -EINVAL;
2004 }
2005 if (rc)
2006 return rc;
2007
2008 __floating_irq_kick(kvm, type);
2009 return 0;
2010 }
2011
kvm_s390_inject_vm(struct kvm * kvm,struct kvm_s390_interrupt * s390int)2012 int kvm_s390_inject_vm(struct kvm *kvm,
2013 struct kvm_s390_interrupt *s390int)
2014 {
2015 struct kvm_s390_interrupt_info *inti;
2016 int rc;
2017
2018 inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
2019 if (!inti)
2020 return -ENOMEM;
2021
2022 inti->type = s390int->type;
2023 switch (inti->type) {
2024 case KVM_S390_INT_VIRTIO:
2025 VM_EVENT(kvm, 5, "inject: virtio parm:%x,parm64:%llx",
2026 s390int->parm, s390int->parm64);
2027 inti->ext.ext_params = s390int->parm;
2028 inti->ext.ext_params2 = s390int->parm64;
2029 break;
2030 case KVM_S390_INT_SERVICE:
2031 VM_EVENT(kvm, 4, "inject: sclp parm:%x", s390int->parm);
2032 inti->ext.ext_params = s390int->parm;
2033 break;
2034 case KVM_S390_INT_PFAULT_DONE:
2035 inti->ext.ext_params2 = s390int->parm64;
2036 break;
2037 case KVM_S390_MCHK:
2038 VM_EVENT(kvm, 3, "inject: machine check mcic 0x%llx",
2039 s390int->parm64);
2040 inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
2041 inti->mchk.mcic = s390int->parm64;
2042 break;
2043 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2044 inti->io.subchannel_id = s390int->parm >> 16;
2045 inti->io.subchannel_nr = s390int->parm & 0x0000ffffu;
2046 inti->io.io_int_parm = s390int->parm64 >> 32;
2047 inti->io.io_int_word = s390int->parm64 & 0x00000000ffffffffull;
2048 break;
2049 default:
2050 kfree(inti);
2051 return -EINVAL;
2052 }
2053 trace_kvm_s390_inject_vm(s390int->type, s390int->parm, s390int->parm64,
2054 2);
2055
2056 rc = __inject_vm(kvm, inti);
2057 if (rc)
2058 kfree(inti);
2059 return rc;
2060 }
2061
kvm_s390_reinject_io_int(struct kvm * kvm,struct kvm_s390_interrupt_info * inti)2062 int kvm_s390_reinject_io_int(struct kvm *kvm,
2063 struct kvm_s390_interrupt_info *inti)
2064 {
2065 return __inject_vm(kvm, inti);
2066 }
2067
s390int_to_s390irq(struct kvm_s390_interrupt * s390int,struct kvm_s390_irq * irq)2068 int s390int_to_s390irq(struct kvm_s390_interrupt *s390int,
2069 struct kvm_s390_irq *irq)
2070 {
2071 irq->type = s390int->type;
2072 switch (irq->type) {
2073 case KVM_S390_PROGRAM_INT:
2074 if (s390int->parm & 0xffff0000)
2075 return -EINVAL;
2076 irq->u.pgm.code = s390int->parm;
2077 break;
2078 case KVM_S390_SIGP_SET_PREFIX:
2079 irq->u.prefix.address = s390int->parm;
2080 break;
2081 case KVM_S390_SIGP_STOP:
2082 irq->u.stop.flags = s390int->parm;
2083 break;
2084 case KVM_S390_INT_EXTERNAL_CALL:
2085 if (s390int->parm & 0xffff0000)
2086 return -EINVAL;
2087 irq->u.extcall.code = s390int->parm;
2088 break;
2089 case KVM_S390_INT_EMERGENCY:
2090 if (s390int->parm & 0xffff0000)
2091 return -EINVAL;
2092 irq->u.emerg.code = s390int->parm;
2093 break;
2094 case KVM_S390_MCHK:
2095 irq->u.mchk.mcic = s390int->parm64;
2096 break;
2097 case KVM_S390_INT_PFAULT_INIT:
2098 irq->u.ext.ext_params = s390int->parm;
2099 irq->u.ext.ext_params2 = s390int->parm64;
2100 break;
2101 case KVM_S390_RESTART:
2102 case KVM_S390_INT_CLOCK_COMP:
2103 case KVM_S390_INT_CPU_TIMER:
2104 break;
2105 default:
2106 return -EINVAL;
2107 }
2108 return 0;
2109 }
2110
kvm_s390_is_stop_irq_pending(struct kvm_vcpu * vcpu)2111 int kvm_s390_is_stop_irq_pending(struct kvm_vcpu *vcpu)
2112 {
2113 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2114
2115 return test_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
2116 }
2117
kvm_s390_is_restart_irq_pending(struct kvm_vcpu * vcpu)2118 int kvm_s390_is_restart_irq_pending(struct kvm_vcpu *vcpu)
2119 {
2120 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2121
2122 return test_bit(IRQ_PEND_RESTART, &li->pending_irqs);
2123 }
2124
kvm_s390_clear_stop_irq(struct kvm_vcpu * vcpu)2125 void kvm_s390_clear_stop_irq(struct kvm_vcpu *vcpu)
2126 {
2127 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2128
2129 spin_lock(&li->lock);
2130 li->irq.stop.flags = 0;
2131 clear_bit(IRQ_PEND_SIGP_STOP, &li->pending_irqs);
2132 spin_unlock(&li->lock);
2133 }
2134
do_inject_vcpu(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)2135 static int do_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
2136 {
2137 int rc;
2138
2139 switch (irq->type) {
2140 case KVM_S390_PROGRAM_INT:
2141 rc = __inject_prog(vcpu, irq);
2142 break;
2143 case KVM_S390_SIGP_SET_PREFIX:
2144 rc = __inject_set_prefix(vcpu, irq);
2145 break;
2146 case KVM_S390_SIGP_STOP:
2147 rc = __inject_sigp_stop(vcpu, irq);
2148 break;
2149 case KVM_S390_RESTART:
2150 rc = __inject_sigp_restart(vcpu);
2151 break;
2152 case KVM_S390_INT_CLOCK_COMP:
2153 rc = __inject_ckc(vcpu);
2154 break;
2155 case KVM_S390_INT_CPU_TIMER:
2156 rc = __inject_cpu_timer(vcpu);
2157 break;
2158 case KVM_S390_INT_EXTERNAL_CALL:
2159 rc = __inject_extcall(vcpu, irq);
2160 break;
2161 case KVM_S390_INT_EMERGENCY:
2162 rc = __inject_sigp_emergency(vcpu, irq);
2163 break;
2164 case KVM_S390_MCHK:
2165 rc = __inject_mchk(vcpu, irq);
2166 break;
2167 case KVM_S390_INT_PFAULT_INIT:
2168 rc = __inject_pfault_init(vcpu, irq);
2169 break;
2170 case KVM_S390_INT_VIRTIO:
2171 case KVM_S390_INT_SERVICE:
2172 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2173 default:
2174 rc = -EINVAL;
2175 }
2176
2177 return rc;
2178 }
2179
kvm_s390_inject_vcpu(struct kvm_vcpu * vcpu,struct kvm_s390_irq * irq)2180 int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu, struct kvm_s390_irq *irq)
2181 {
2182 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2183 int rc;
2184
2185 spin_lock(&li->lock);
2186 rc = do_inject_vcpu(vcpu, irq);
2187 spin_unlock(&li->lock);
2188 if (!rc)
2189 kvm_s390_vcpu_wakeup(vcpu);
2190 return rc;
2191 }
2192
clear_irq_list(struct list_head * _list)2193 static inline void clear_irq_list(struct list_head *_list)
2194 {
2195 struct kvm_s390_interrupt_info *inti, *n;
2196
2197 list_for_each_entry_safe(inti, n, _list, list) {
2198 list_del(&inti->list);
2199 kfree(inti);
2200 }
2201 }
2202
inti_to_irq(struct kvm_s390_interrupt_info * inti,struct kvm_s390_irq * irq)2203 static void inti_to_irq(struct kvm_s390_interrupt_info *inti,
2204 struct kvm_s390_irq *irq)
2205 {
2206 irq->type = inti->type;
2207 switch (inti->type) {
2208 case KVM_S390_INT_PFAULT_INIT:
2209 case KVM_S390_INT_PFAULT_DONE:
2210 case KVM_S390_INT_VIRTIO:
2211 irq->u.ext = inti->ext;
2212 break;
2213 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2214 irq->u.io = inti->io;
2215 break;
2216 }
2217 }
2218
kvm_s390_clear_float_irqs(struct kvm * kvm)2219 void kvm_s390_clear_float_irqs(struct kvm *kvm)
2220 {
2221 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2222 int i;
2223
2224 mutex_lock(&kvm->lock);
2225 if (!kvm_s390_pv_is_protected(kvm))
2226 fi->masked_irqs = 0;
2227 mutex_unlock(&kvm->lock);
2228 spin_lock(&fi->lock);
2229 fi->pending_irqs = 0;
2230 memset(&fi->srv_signal, 0, sizeof(fi->srv_signal));
2231 memset(&fi->mchk, 0, sizeof(fi->mchk));
2232 for (i = 0; i < FIRQ_LIST_COUNT; i++)
2233 clear_irq_list(&fi->lists[i]);
2234 for (i = 0; i < FIRQ_MAX_COUNT; i++)
2235 fi->counters[i] = 0;
2236 spin_unlock(&fi->lock);
2237 kvm_s390_gisa_clear(kvm);
2238 };
2239
get_all_floating_irqs(struct kvm * kvm,u8 __user * usrbuf,u64 len)2240 static int get_all_floating_irqs(struct kvm *kvm, u8 __user *usrbuf, u64 len)
2241 {
2242 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
2243 struct kvm_s390_interrupt_info *inti;
2244 struct kvm_s390_float_interrupt *fi;
2245 struct kvm_s390_irq *buf;
2246 struct kvm_s390_irq *irq;
2247 int max_irqs;
2248 int ret = 0;
2249 int n = 0;
2250 int i;
2251
2252 if (len > KVM_S390_FLIC_MAX_BUFFER || len == 0)
2253 return -EINVAL;
2254
2255 /*
2256 * We are already using -ENOMEM to signal
2257 * userspace it may retry with a bigger buffer,
2258 * so we need to use something else for this case
2259 */
2260 buf = vzalloc(len);
2261 if (!buf)
2262 return -ENOBUFS;
2263
2264 max_irqs = len / sizeof(struct kvm_s390_irq);
2265
2266 if (gi->origin && gisa_get_ipm(gi->origin)) {
2267 for (i = 0; i <= MAX_ISC; i++) {
2268 if (n == max_irqs) {
2269 /* signal userspace to try again */
2270 ret = -ENOMEM;
2271 goto out_nolock;
2272 }
2273 if (gisa_tac_ipm_gisc(gi->origin, i)) {
2274 irq = (struct kvm_s390_irq *) &buf[n];
2275 irq->type = KVM_S390_INT_IO(1, 0, 0, 0);
2276 irq->u.io.io_int_word = isc_to_int_word(i);
2277 n++;
2278 }
2279 }
2280 }
2281 fi = &kvm->arch.float_int;
2282 spin_lock(&fi->lock);
2283 for (i = 0; i < FIRQ_LIST_COUNT; i++) {
2284 list_for_each_entry(inti, &fi->lists[i], list) {
2285 if (n == max_irqs) {
2286 /* signal userspace to try again */
2287 ret = -ENOMEM;
2288 goto out;
2289 }
2290 inti_to_irq(inti, &buf[n]);
2291 n++;
2292 }
2293 }
2294 if (test_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs) ||
2295 test_bit(IRQ_PEND_EXT_SERVICE_EV, &fi->pending_irqs)) {
2296 if (n == max_irqs) {
2297 /* signal userspace to try again */
2298 ret = -ENOMEM;
2299 goto out;
2300 }
2301 irq = (struct kvm_s390_irq *) &buf[n];
2302 irq->type = KVM_S390_INT_SERVICE;
2303 irq->u.ext = fi->srv_signal;
2304 n++;
2305 }
2306 if (test_bit(IRQ_PEND_MCHK_REP, &fi->pending_irqs)) {
2307 if (n == max_irqs) {
2308 /* signal userspace to try again */
2309 ret = -ENOMEM;
2310 goto out;
2311 }
2312 irq = (struct kvm_s390_irq *) &buf[n];
2313 irq->type = KVM_S390_MCHK;
2314 irq->u.mchk = fi->mchk;
2315 n++;
2316 }
2317
2318 out:
2319 spin_unlock(&fi->lock);
2320 out_nolock:
2321 if (!ret && n > 0) {
2322 if (copy_to_user(usrbuf, buf, sizeof(struct kvm_s390_irq) * n))
2323 ret = -EFAULT;
2324 }
2325 vfree(buf);
2326
2327 return ret < 0 ? ret : n;
2328 }
2329
flic_ais_mode_get_all(struct kvm * kvm,struct kvm_device_attr * attr)2330 static int flic_ais_mode_get_all(struct kvm *kvm, struct kvm_device_attr *attr)
2331 {
2332 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2333 struct kvm_s390_ais_all ais;
2334
2335 if (attr->attr < sizeof(ais))
2336 return -EINVAL;
2337
2338 if (!test_kvm_facility(kvm, 72))
2339 return -EOPNOTSUPP;
2340
2341 mutex_lock(&fi->ais_lock);
2342 ais.simm = fi->simm;
2343 ais.nimm = fi->nimm;
2344 mutex_unlock(&fi->ais_lock);
2345
2346 if (copy_to_user((void __user *)attr->addr, &ais, sizeof(ais)))
2347 return -EFAULT;
2348
2349 return 0;
2350 }
2351
flic_get_attr(struct kvm_device * dev,struct kvm_device_attr * attr)2352 static int flic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2353 {
2354 int r;
2355
2356 switch (attr->group) {
2357 case KVM_DEV_FLIC_GET_ALL_IRQS:
2358 r = get_all_floating_irqs(dev->kvm, (u8 __user *) attr->addr,
2359 attr->attr);
2360 break;
2361 case KVM_DEV_FLIC_AISM_ALL:
2362 r = flic_ais_mode_get_all(dev->kvm, attr);
2363 break;
2364 default:
2365 r = -EINVAL;
2366 }
2367
2368 return r;
2369 }
2370
copy_irq_from_user(struct kvm_s390_interrupt_info * inti,u64 addr)2371 static inline int copy_irq_from_user(struct kvm_s390_interrupt_info *inti,
2372 u64 addr)
2373 {
2374 struct kvm_s390_irq __user *uptr = (struct kvm_s390_irq __user *) addr;
2375 void *target = NULL;
2376 void __user *source;
2377 u64 size;
2378
2379 if (get_user(inti->type, (u64 __user *)addr))
2380 return -EFAULT;
2381
2382 switch (inti->type) {
2383 case KVM_S390_INT_PFAULT_INIT:
2384 case KVM_S390_INT_PFAULT_DONE:
2385 case KVM_S390_INT_VIRTIO:
2386 case KVM_S390_INT_SERVICE:
2387 target = (void *) &inti->ext;
2388 source = &uptr->u.ext;
2389 size = sizeof(inti->ext);
2390 break;
2391 case KVM_S390_INT_IO_MIN...KVM_S390_INT_IO_MAX:
2392 target = (void *) &inti->io;
2393 source = &uptr->u.io;
2394 size = sizeof(inti->io);
2395 break;
2396 case KVM_S390_MCHK:
2397 target = (void *) &inti->mchk;
2398 source = &uptr->u.mchk;
2399 size = sizeof(inti->mchk);
2400 break;
2401 default:
2402 return -EINVAL;
2403 }
2404
2405 if (copy_from_user(target, source, size))
2406 return -EFAULT;
2407
2408 return 0;
2409 }
2410
enqueue_floating_irq(struct kvm_device * dev,struct kvm_device_attr * attr)2411 static int enqueue_floating_irq(struct kvm_device *dev,
2412 struct kvm_device_attr *attr)
2413 {
2414 struct kvm_s390_interrupt_info *inti = NULL;
2415 int r = 0;
2416 int len = attr->attr;
2417
2418 if (len % sizeof(struct kvm_s390_irq) != 0)
2419 return -EINVAL;
2420 else if (len > KVM_S390_FLIC_MAX_BUFFER)
2421 return -EINVAL;
2422
2423 while (len >= sizeof(struct kvm_s390_irq)) {
2424 inti = kzalloc(sizeof(*inti), GFP_KERNEL_ACCOUNT);
2425 if (!inti)
2426 return -ENOMEM;
2427
2428 r = copy_irq_from_user(inti, attr->addr);
2429 if (r) {
2430 kfree(inti);
2431 return r;
2432 }
2433 r = __inject_vm(dev->kvm, inti);
2434 if (r) {
2435 kfree(inti);
2436 return r;
2437 }
2438 len -= sizeof(struct kvm_s390_irq);
2439 attr->addr += sizeof(struct kvm_s390_irq);
2440 }
2441
2442 return r;
2443 }
2444
get_io_adapter(struct kvm * kvm,unsigned int id)2445 static struct s390_io_adapter *get_io_adapter(struct kvm *kvm, unsigned int id)
2446 {
2447 if (id >= MAX_S390_IO_ADAPTERS)
2448 return NULL;
2449 id = array_index_nospec(id, MAX_S390_IO_ADAPTERS);
2450 return kvm->arch.adapters[id];
2451 }
2452
register_io_adapter(struct kvm_device * dev,struct kvm_device_attr * attr)2453 static int register_io_adapter(struct kvm_device *dev,
2454 struct kvm_device_attr *attr)
2455 {
2456 struct s390_io_adapter *adapter;
2457 struct kvm_s390_io_adapter adapter_info;
2458
2459 if (copy_from_user(&adapter_info,
2460 (void __user *)attr->addr, sizeof(adapter_info)))
2461 return -EFAULT;
2462
2463 if (adapter_info.id >= MAX_S390_IO_ADAPTERS)
2464 return -EINVAL;
2465
2466 adapter_info.id = array_index_nospec(adapter_info.id,
2467 MAX_S390_IO_ADAPTERS);
2468
2469 if (dev->kvm->arch.adapters[adapter_info.id] != NULL)
2470 return -EINVAL;
2471
2472 adapter = kzalloc(sizeof(*adapter), GFP_KERNEL_ACCOUNT);
2473 if (!adapter)
2474 return -ENOMEM;
2475
2476 adapter->id = adapter_info.id;
2477 adapter->isc = adapter_info.isc;
2478 adapter->maskable = adapter_info.maskable;
2479 adapter->masked = false;
2480 adapter->swap = adapter_info.swap;
2481 adapter->suppressible = (adapter_info.flags) &
2482 KVM_S390_ADAPTER_SUPPRESSIBLE;
2483 dev->kvm->arch.adapters[adapter->id] = adapter;
2484
2485 return 0;
2486 }
2487
kvm_s390_mask_adapter(struct kvm * kvm,unsigned int id,bool masked)2488 int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked)
2489 {
2490 int ret;
2491 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2492
2493 if (!adapter || !adapter->maskable)
2494 return -EINVAL;
2495 ret = adapter->masked;
2496 adapter->masked = masked;
2497 return ret;
2498 }
2499
kvm_s390_destroy_adapters(struct kvm * kvm)2500 void kvm_s390_destroy_adapters(struct kvm *kvm)
2501 {
2502 int i;
2503
2504 for (i = 0; i < MAX_S390_IO_ADAPTERS; i++)
2505 kfree(kvm->arch.adapters[i]);
2506 }
2507
modify_io_adapter(struct kvm_device * dev,struct kvm_device_attr * attr)2508 static int modify_io_adapter(struct kvm_device *dev,
2509 struct kvm_device_attr *attr)
2510 {
2511 struct kvm_s390_io_adapter_req req;
2512 struct s390_io_adapter *adapter;
2513 int ret;
2514
2515 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2516 return -EFAULT;
2517
2518 adapter = get_io_adapter(dev->kvm, req.id);
2519 if (!adapter)
2520 return -EINVAL;
2521 switch (req.type) {
2522 case KVM_S390_IO_ADAPTER_MASK:
2523 ret = kvm_s390_mask_adapter(dev->kvm, req.id, req.mask);
2524 if (ret > 0)
2525 ret = 0;
2526 break;
2527 /*
2528 * The following operations are no longer needed and therefore no-ops.
2529 * The gpa to hva translation is done when an IRQ route is set up. The
2530 * set_irq code uses get_user_pages_remote() to do the actual write.
2531 */
2532 case KVM_S390_IO_ADAPTER_MAP:
2533 case KVM_S390_IO_ADAPTER_UNMAP:
2534 ret = 0;
2535 break;
2536 default:
2537 ret = -EINVAL;
2538 }
2539
2540 return ret;
2541 }
2542
clear_io_irq(struct kvm * kvm,struct kvm_device_attr * attr)2543 static int clear_io_irq(struct kvm *kvm, struct kvm_device_attr *attr)
2544
2545 {
2546 const u64 isc_mask = 0xffUL << 24; /* all iscs set */
2547 u32 schid;
2548
2549 if (attr->flags)
2550 return -EINVAL;
2551 if (attr->attr != sizeof(schid))
2552 return -EINVAL;
2553 if (copy_from_user(&schid, (void __user *) attr->addr, sizeof(schid)))
2554 return -EFAULT;
2555 if (!schid)
2556 return -EINVAL;
2557 kfree(kvm_s390_get_io_int(kvm, isc_mask, schid));
2558 /*
2559 * If userspace is conforming to the architecture, we can have at most
2560 * one pending I/O interrupt per subchannel, so this is effectively a
2561 * clear all.
2562 */
2563 return 0;
2564 }
2565
modify_ais_mode(struct kvm * kvm,struct kvm_device_attr * attr)2566 static int modify_ais_mode(struct kvm *kvm, struct kvm_device_attr *attr)
2567 {
2568 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2569 struct kvm_s390_ais_req req;
2570 int ret = 0;
2571
2572 if (!test_kvm_facility(kvm, 72))
2573 return -EOPNOTSUPP;
2574
2575 if (copy_from_user(&req, (void __user *)attr->addr, sizeof(req)))
2576 return -EFAULT;
2577
2578 if (req.isc > MAX_ISC)
2579 return -EINVAL;
2580
2581 trace_kvm_s390_modify_ais_mode(req.isc,
2582 (fi->simm & AIS_MODE_MASK(req.isc)) ?
2583 (fi->nimm & AIS_MODE_MASK(req.isc)) ?
2584 2 : KVM_S390_AIS_MODE_SINGLE :
2585 KVM_S390_AIS_MODE_ALL, req.mode);
2586
2587 mutex_lock(&fi->ais_lock);
2588 switch (req.mode) {
2589 case KVM_S390_AIS_MODE_ALL:
2590 fi->simm &= ~AIS_MODE_MASK(req.isc);
2591 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2592 break;
2593 case KVM_S390_AIS_MODE_SINGLE:
2594 fi->simm |= AIS_MODE_MASK(req.isc);
2595 fi->nimm &= ~AIS_MODE_MASK(req.isc);
2596 break;
2597 default:
2598 ret = -EINVAL;
2599 }
2600 mutex_unlock(&fi->ais_lock);
2601
2602 return ret;
2603 }
2604
kvm_s390_inject_airq(struct kvm * kvm,struct s390_io_adapter * adapter)2605 static int kvm_s390_inject_airq(struct kvm *kvm,
2606 struct s390_io_adapter *adapter)
2607 {
2608 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2609 struct kvm_s390_interrupt s390int = {
2610 .type = KVM_S390_INT_IO(1, 0, 0, 0),
2611 .parm = 0,
2612 .parm64 = isc_to_int_word(adapter->isc),
2613 };
2614 int ret = 0;
2615
2616 if (!test_kvm_facility(kvm, 72) || !adapter->suppressible)
2617 return kvm_s390_inject_vm(kvm, &s390int);
2618
2619 mutex_lock(&fi->ais_lock);
2620 if (fi->nimm & AIS_MODE_MASK(adapter->isc)) {
2621 trace_kvm_s390_airq_suppressed(adapter->id, adapter->isc);
2622 goto out;
2623 }
2624
2625 ret = kvm_s390_inject_vm(kvm, &s390int);
2626 if (!ret && (fi->simm & AIS_MODE_MASK(adapter->isc))) {
2627 fi->nimm |= AIS_MODE_MASK(adapter->isc);
2628 trace_kvm_s390_modify_ais_mode(adapter->isc,
2629 KVM_S390_AIS_MODE_SINGLE, 2);
2630 }
2631 out:
2632 mutex_unlock(&fi->ais_lock);
2633 return ret;
2634 }
2635
flic_inject_airq(struct kvm * kvm,struct kvm_device_attr * attr)2636 static int flic_inject_airq(struct kvm *kvm, struct kvm_device_attr *attr)
2637 {
2638 unsigned int id = attr->attr;
2639 struct s390_io_adapter *adapter = get_io_adapter(kvm, id);
2640
2641 if (!adapter)
2642 return -EINVAL;
2643
2644 return kvm_s390_inject_airq(kvm, adapter);
2645 }
2646
flic_ais_mode_set_all(struct kvm * kvm,struct kvm_device_attr * attr)2647 static int flic_ais_mode_set_all(struct kvm *kvm, struct kvm_device_attr *attr)
2648 {
2649 struct kvm_s390_float_interrupt *fi = &kvm->arch.float_int;
2650 struct kvm_s390_ais_all ais;
2651
2652 if (!test_kvm_facility(kvm, 72))
2653 return -EOPNOTSUPP;
2654
2655 if (copy_from_user(&ais, (void __user *)attr->addr, sizeof(ais)))
2656 return -EFAULT;
2657
2658 mutex_lock(&fi->ais_lock);
2659 fi->simm = ais.simm;
2660 fi->nimm = ais.nimm;
2661 mutex_unlock(&fi->ais_lock);
2662
2663 return 0;
2664 }
2665
flic_set_attr(struct kvm_device * dev,struct kvm_device_attr * attr)2666 static int flic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
2667 {
2668 int r = 0;
2669 unsigned long i;
2670 struct kvm_vcpu *vcpu;
2671
2672 switch (attr->group) {
2673 case KVM_DEV_FLIC_ENQUEUE:
2674 r = enqueue_floating_irq(dev, attr);
2675 break;
2676 case KVM_DEV_FLIC_CLEAR_IRQS:
2677 kvm_s390_clear_float_irqs(dev->kvm);
2678 break;
2679 case KVM_DEV_FLIC_APF_ENABLE:
2680 if (kvm_is_ucontrol(dev->kvm))
2681 return -EINVAL;
2682 dev->kvm->arch.gmap->pfault_enabled = 1;
2683 break;
2684 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2685 if (kvm_is_ucontrol(dev->kvm))
2686 return -EINVAL;
2687 dev->kvm->arch.gmap->pfault_enabled = 0;
2688 /*
2689 * Make sure no async faults are in transition when
2690 * clearing the queues. So we don't need to worry
2691 * about late coming workers.
2692 */
2693 synchronize_srcu(&dev->kvm->srcu);
2694 kvm_for_each_vcpu(i, vcpu, dev->kvm)
2695 kvm_clear_async_pf_completion_queue(vcpu);
2696 break;
2697 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2698 r = register_io_adapter(dev, attr);
2699 break;
2700 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2701 r = modify_io_adapter(dev, attr);
2702 break;
2703 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2704 r = clear_io_irq(dev->kvm, attr);
2705 break;
2706 case KVM_DEV_FLIC_AISM:
2707 r = modify_ais_mode(dev->kvm, attr);
2708 break;
2709 case KVM_DEV_FLIC_AIRQ_INJECT:
2710 r = flic_inject_airq(dev->kvm, attr);
2711 break;
2712 case KVM_DEV_FLIC_AISM_ALL:
2713 r = flic_ais_mode_set_all(dev->kvm, attr);
2714 break;
2715 default:
2716 r = -EINVAL;
2717 }
2718
2719 return r;
2720 }
2721
flic_has_attr(struct kvm_device * dev,struct kvm_device_attr * attr)2722 static int flic_has_attr(struct kvm_device *dev,
2723 struct kvm_device_attr *attr)
2724 {
2725 switch (attr->group) {
2726 case KVM_DEV_FLIC_GET_ALL_IRQS:
2727 case KVM_DEV_FLIC_ENQUEUE:
2728 case KVM_DEV_FLIC_CLEAR_IRQS:
2729 case KVM_DEV_FLIC_APF_ENABLE:
2730 case KVM_DEV_FLIC_APF_DISABLE_WAIT:
2731 case KVM_DEV_FLIC_ADAPTER_REGISTER:
2732 case KVM_DEV_FLIC_ADAPTER_MODIFY:
2733 case KVM_DEV_FLIC_CLEAR_IO_IRQ:
2734 case KVM_DEV_FLIC_AISM:
2735 case KVM_DEV_FLIC_AIRQ_INJECT:
2736 case KVM_DEV_FLIC_AISM_ALL:
2737 return 0;
2738 }
2739 return -ENXIO;
2740 }
2741
flic_create(struct kvm_device * dev,u32 type)2742 static int flic_create(struct kvm_device *dev, u32 type)
2743 {
2744 if (!dev)
2745 return -EINVAL;
2746 if (dev->kvm->arch.flic)
2747 return -EINVAL;
2748 dev->kvm->arch.flic = dev;
2749 return 0;
2750 }
2751
flic_destroy(struct kvm_device * dev)2752 static void flic_destroy(struct kvm_device *dev)
2753 {
2754 dev->kvm->arch.flic = NULL;
2755 kfree(dev);
2756 }
2757
2758 /* s390 floating irq controller (flic) */
2759 struct kvm_device_ops kvm_flic_ops = {
2760 .name = "kvm-flic",
2761 .get_attr = flic_get_attr,
2762 .set_attr = flic_set_attr,
2763 .has_attr = flic_has_attr,
2764 .create = flic_create,
2765 .destroy = flic_destroy,
2766 };
2767
get_ind_bit(__u64 addr,unsigned long bit_nr,bool swap)2768 static unsigned long get_ind_bit(__u64 addr, unsigned long bit_nr, bool swap)
2769 {
2770 unsigned long bit;
2771
2772 bit = bit_nr + (addr % PAGE_SIZE) * 8;
2773
2774 return swap ? (bit ^ (BITS_PER_LONG - 1)) : bit;
2775 }
2776
get_map_page(struct kvm * kvm,u64 uaddr)2777 static struct page *get_map_page(struct kvm *kvm, u64 uaddr)
2778 {
2779 struct mm_struct *mm = kvm->mm;
2780 struct page *page = NULL;
2781 int locked = 1;
2782
2783 if (mmget_not_zero(mm)) {
2784 mmap_read_lock(mm);
2785 get_user_pages_remote(mm, uaddr, 1, FOLL_WRITE,
2786 &page, &locked);
2787 if (locked)
2788 mmap_read_unlock(mm);
2789 mmput(mm);
2790 }
2791
2792 return page;
2793 }
2794
adapter_indicators_set(struct kvm * kvm,struct s390_io_adapter * adapter,struct kvm_s390_adapter_int * adapter_int)2795 static int adapter_indicators_set(struct kvm *kvm,
2796 struct s390_io_adapter *adapter,
2797 struct kvm_s390_adapter_int *adapter_int)
2798 {
2799 unsigned long bit;
2800 int summary_set, idx;
2801 struct page *ind_page, *summary_page;
2802 void *map;
2803
2804 ind_page = get_map_page(kvm, adapter_int->ind_addr);
2805 if (!ind_page)
2806 return -1;
2807 summary_page = get_map_page(kvm, adapter_int->summary_addr);
2808 if (!summary_page) {
2809 put_page(ind_page);
2810 return -1;
2811 }
2812
2813 idx = srcu_read_lock(&kvm->srcu);
2814 map = page_address(ind_page);
2815 bit = get_ind_bit(adapter_int->ind_addr,
2816 adapter_int->ind_offset, adapter->swap);
2817 set_bit(bit, map);
2818 mark_page_dirty(kvm, adapter_int->ind_addr >> PAGE_SHIFT);
2819 set_page_dirty_lock(ind_page);
2820 map = page_address(summary_page);
2821 bit = get_ind_bit(adapter_int->summary_addr,
2822 adapter_int->summary_offset, adapter->swap);
2823 summary_set = test_and_set_bit(bit, map);
2824 mark_page_dirty(kvm, adapter_int->summary_addr >> PAGE_SHIFT);
2825 set_page_dirty_lock(summary_page);
2826 srcu_read_unlock(&kvm->srcu, idx);
2827
2828 put_page(ind_page);
2829 put_page(summary_page);
2830 return summary_set ? 0 : 1;
2831 }
2832
2833 /*
2834 * < 0 - not injected due to error
2835 * = 0 - coalesced, summary indicator already active
2836 * > 0 - injected interrupt
2837 */
set_adapter_int(struct kvm_kernel_irq_routing_entry * e,struct kvm * kvm,int irq_source_id,int level,bool line_status)2838 static int set_adapter_int(struct kvm_kernel_irq_routing_entry *e,
2839 struct kvm *kvm, int irq_source_id, int level,
2840 bool line_status)
2841 {
2842 int ret;
2843 struct s390_io_adapter *adapter;
2844
2845 /* We're only interested in the 0->1 transition. */
2846 if (!level)
2847 return 0;
2848 adapter = get_io_adapter(kvm, e->adapter.adapter_id);
2849 if (!adapter)
2850 return -1;
2851 ret = adapter_indicators_set(kvm, adapter, &e->adapter);
2852 if ((ret > 0) && !adapter->masked) {
2853 ret = kvm_s390_inject_airq(kvm, adapter);
2854 if (ret == 0)
2855 ret = 1;
2856 }
2857 return ret;
2858 }
2859
2860 /*
2861 * Inject the machine check to the guest.
2862 */
kvm_s390_reinject_machine_check(struct kvm_vcpu * vcpu,struct mcck_volatile_info * mcck_info)2863 void kvm_s390_reinject_machine_check(struct kvm_vcpu *vcpu,
2864 struct mcck_volatile_info *mcck_info)
2865 {
2866 struct kvm_s390_interrupt_info inti;
2867 struct kvm_s390_irq irq;
2868 struct kvm_s390_mchk_info *mchk;
2869 union mci mci;
2870 __u64 cr14 = 0; /* upper bits are not used */
2871 int rc;
2872
2873 mci.val = mcck_info->mcic;
2874 if (mci.sr)
2875 cr14 |= CR14_RECOVERY_SUBMASK;
2876 if (mci.dg)
2877 cr14 |= CR14_DEGRADATION_SUBMASK;
2878 if (mci.w)
2879 cr14 |= CR14_WARNING_SUBMASK;
2880
2881 mchk = mci.ck ? &inti.mchk : &irq.u.mchk;
2882 mchk->cr14 = cr14;
2883 mchk->mcic = mcck_info->mcic;
2884 mchk->ext_damage_code = mcck_info->ext_damage_code;
2885 mchk->failing_storage_address = mcck_info->failing_storage_address;
2886 if (mci.ck) {
2887 /* Inject the floating machine check */
2888 inti.type = KVM_S390_MCHK;
2889 rc = __inject_vm(vcpu->kvm, &inti);
2890 } else {
2891 /* Inject the machine check to specified vcpu */
2892 irq.type = KVM_S390_MCHK;
2893 rc = kvm_s390_inject_vcpu(vcpu, &irq);
2894 }
2895 WARN_ON_ONCE(rc);
2896 }
2897
kvm_set_routing_entry(struct kvm * kvm,struct kvm_kernel_irq_routing_entry * e,const struct kvm_irq_routing_entry * ue)2898 int kvm_set_routing_entry(struct kvm *kvm,
2899 struct kvm_kernel_irq_routing_entry *e,
2900 const struct kvm_irq_routing_entry *ue)
2901 {
2902 u64 uaddr_s, uaddr_i;
2903 int idx;
2904
2905 switch (ue->type) {
2906 /* we store the userspace addresses instead of the guest addresses */
2907 case KVM_IRQ_ROUTING_S390_ADAPTER:
2908 if (kvm_is_ucontrol(kvm))
2909 return -EINVAL;
2910 e->set = set_adapter_int;
2911
2912 idx = srcu_read_lock(&kvm->srcu);
2913 uaddr_s = gpa_to_hva(kvm, ue->u.adapter.summary_addr);
2914 uaddr_i = gpa_to_hva(kvm, ue->u.adapter.ind_addr);
2915 srcu_read_unlock(&kvm->srcu, idx);
2916
2917 if (kvm_is_error_hva(uaddr_s) || kvm_is_error_hva(uaddr_i))
2918 return -EFAULT;
2919 e->adapter.summary_addr = uaddr_s;
2920 e->adapter.ind_addr = uaddr_i;
2921 e->adapter.summary_offset = ue->u.adapter.summary_offset;
2922 e->adapter.ind_offset = ue->u.adapter.ind_offset;
2923 e->adapter.adapter_id = ue->u.adapter.adapter_id;
2924 return 0;
2925 default:
2926 return -EINVAL;
2927 }
2928 }
2929
kvm_set_msi(struct kvm_kernel_irq_routing_entry * e,struct kvm * kvm,int irq_source_id,int level,bool line_status)2930 int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm *kvm,
2931 int irq_source_id, int level, bool line_status)
2932 {
2933 return -EINVAL;
2934 }
2935
kvm_s390_set_irq_state(struct kvm_vcpu * vcpu,void __user * irqstate,int len)2936 int kvm_s390_set_irq_state(struct kvm_vcpu *vcpu, void __user *irqstate, int len)
2937 {
2938 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
2939 struct kvm_s390_irq *buf;
2940 int r = 0;
2941 int n;
2942
2943 buf = vmalloc(len);
2944 if (!buf)
2945 return -ENOMEM;
2946
2947 if (copy_from_user((void *) buf, irqstate, len)) {
2948 r = -EFAULT;
2949 goto out_free;
2950 }
2951
2952 /*
2953 * Don't allow setting the interrupt state
2954 * when there are already interrupts pending
2955 */
2956 spin_lock(&li->lock);
2957 if (li->pending_irqs) {
2958 r = -EBUSY;
2959 goto out_unlock;
2960 }
2961
2962 for (n = 0; n < len / sizeof(*buf); n++) {
2963 r = do_inject_vcpu(vcpu, &buf[n]);
2964 if (r)
2965 break;
2966 }
2967
2968 out_unlock:
2969 spin_unlock(&li->lock);
2970 out_free:
2971 vfree(buf);
2972
2973 return r;
2974 }
2975
store_local_irq(struct kvm_s390_local_interrupt * li,struct kvm_s390_irq * irq,unsigned long irq_type)2976 static void store_local_irq(struct kvm_s390_local_interrupt *li,
2977 struct kvm_s390_irq *irq,
2978 unsigned long irq_type)
2979 {
2980 switch (irq_type) {
2981 case IRQ_PEND_MCHK_EX:
2982 case IRQ_PEND_MCHK_REP:
2983 irq->type = KVM_S390_MCHK;
2984 irq->u.mchk = li->irq.mchk;
2985 break;
2986 case IRQ_PEND_PROG:
2987 irq->type = KVM_S390_PROGRAM_INT;
2988 irq->u.pgm = li->irq.pgm;
2989 break;
2990 case IRQ_PEND_PFAULT_INIT:
2991 irq->type = KVM_S390_INT_PFAULT_INIT;
2992 irq->u.ext = li->irq.ext;
2993 break;
2994 case IRQ_PEND_EXT_EXTERNAL:
2995 irq->type = KVM_S390_INT_EXTERNAL_CALL;
2996 irq->u.extcall = li->irq.extcall;
2997 break;
2998 case IRQ_PEND_EXT_CLOCK_COMP:
2999 irq->type = KVM_S390_INT_CLOCK_COMP;
3000 break;
3001 case IRQ_PEND_EXT_CPU_TIMER:
3002 irq->type = KVM_S390_INT_CPU_TIMER;
3003 break;
3004 case IRQ_PEND_SIGP_STOP:
3005 irq->type = KVM_S390_SIGP_STOP;
3006 irq->u.stop = li->irq.stop;
3007 break;
3008 case IRQ_PEND_RESTART:
3009 irq->type = KVM_S390_RESTART;
3010 break;
3011 case IRQ_PEND_SET_PREFIX:
3012 irq->type = KVM_S390_SIGP_SET_PREFIX;
3013 irq->u.prefix = li->irq.prefix;
3014 break;
3015 }
3016 }
3017
kvm_s390_get_irq_state(struct kvm_vcpu * vcpu,__u8 __user * buf,int len)3018 int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
3019 {
3020 int scn;
3021 DECLARE_BITMAP(sigp_emerg_pending, KVM_MAX_VCPUS);
3022 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
3023 unsigned long pending_irqs;
3024 struct kvm_s390_irq irq;
3025 unsigned long irq_type;
3026 int cpuaddr;
3027 int n = 0;
3028
3029 spin_lock(&li->lock);
3030 pending_irqs = li->pending_irqs;
3031 memcpy(&sigp_emerg_pending, &li->sigp_emerg_pending,
3032 sizeof(sigp_emerg_pending));
3033 spin_unlock(&li->lock);
3034
3035 for_each_set_bit(irq_type, &pending_irqs, IRQ_PEND_COUNT) {
3036 memset(&irq, 0, sizeof(irq));
3037 if (irq_type == IRQ_PEND_EXT_EMERGENCY)
3038 continue;
3039 if (n + sizeof(irq) > len)
3040 return -ENOBUFS;
3041 store_local_irq(&vcpu->arch.local_int, &irq, irq_type);
3042 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
3043 return -EFAULT;
3044 n += sizeof(irq);
3045 }
3046
3047 if (test_bit(IRQ_PEND_EXT_EMERGENCY, &pending_irqs)) {
3048 for_each_set_bit(cpuaddr, sigp_emerg_pending, KVM_MAX_VCPUS) {
3049 memset(&irq, 0, sizeof(irq));
3050 if (n + sizeof(irq) > len)
3051 return -ENOBUFS;
3052 irq.type = KVM_S390_INT_EMERGENCY;
3053 irq.u.emerg.code = cpuaddr;
3054 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
3055 return -EFAULT;
3056 n += sizeof(irq);
3057 }
3058 }
3059
3060 if (sca_ext_call_pending(vcpu, &scn)) {
3061 if (n + sizeof(irq) > len)
3062 return -ENOBUFS;
3063 memset(&irq, 0, sizeof(irq));
3064 irq.type = KVM_S390_INT_EXTERNAL_CALL;
3065 irq.u.extcall.code = scn;
3066 if (copy_to_user(&buf[n], &irq, sizeof(irq)))
3067 return -EFAULT;
3068 n += sizeof(irq);
3069 }
3070
3071 return n;
3072 }
3073
__airqs_kick_single_vcpu(struct kvm * kvm,u8 deliverable_mask)3074 static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
3075 {
3076 int vcpu_idx, online_vcpus = atomic_read(&kvm->online_vcpus);
3077 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3078 struct kvm_vcpu *vcpu;
3079 u8 vcpu_isc_mask;
3080
3081 for_each_set_bit(vcpu_idx, kvm->arch.idle_mask, online_vcpus) {
3082 vcpu = kvm_get_vcpu(kvm, vcpu_idx);
3083 if (psw_ioint_disabled(vcpu))
3084 continue;
3085 vcpu_isc_mask = (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
3086 if (deliverable_mask & vcpu_isc_mask) {
3087 /* lately kicked but not yet running */
3088 if (test_and_set_bit(vcpu_idx, gi->kicked_mask))
3089 return;
3090 kvm_s390_vcpu_wakeup(vcpu);
3091 return;
3092 }
3093 }
3094 }
3095
gisa_vcpu_kicker(struct hrtimer * timer)3096 static enum hrtimer_restart gisa_vcpu_kicker(struct hrtimer *timer)
3097 {
3098 struct kvm_s390_gisa_interrupt *gi =
3099 container_of(timer, struct kvm_s390_gisa_interrupt, timer);
3100 struct kvm *kvm =
3101 container_of(gi->origin, struct sie_page2, gisa)->kvm;
3102 u8 pending_mask;
3103
3104 pending_mask = gisa_get_ipm_or_restore_iam(gi);
3105 if (pending_mask) {
3106 __airqs_kick_single_vcpu(kvm, pending_mask);
3107 hrtimer_forward_now(timer, ns_to_ktime(gi->expires));
3108 return HRTIMER_RESTART;
3109 }
3110
3111 return HRTIMER_NORESTART;
3112 }
3113
3114 #define NULL_GISA_ADDR 0x00000000UL
3115 #define NONE_GISA_ADDR 0x00000001UL
3116 #define GISA_ADDR_MASK 0xfffff000UL
3117
process_gib_alert_list(void)3118 static void process_gib_alert_list(void)
3119 {
3120 struct kvm_s390_gisa_interrupt *gi;
3121 u32 final, gisa_phys, origin = 0UL;
3122 struct kvm_s390_gisa *gisa;
3123 struct kvm *kvm;
3124
3125 do {
3126 /*
3127 * If the NONE_GISA_ADDR is still stored in the alert list
3128 * origin, we will leave the outer loop. No further GISA has
3129 * been added to the alert list by millicode while processing
3130 * the current alert list.
3131 */
3132 final = (origin & NONE_GISA_ADDR);
3133 /*
3134 * Cut off the alert list and store the NONE_GISA_ADDR in the
3135 * alert list origin to avoid further GAL interruptions.
3136 * A new alert list can be build up by millicode in parallel
3137 * for guests not in the yet cut-off alert list. When in the
3138 * final loop, store the NULL_GISA_ADDR instead. This will re-
3139 * enable GAL interruptions on the host again.
3140 */
3141 origin = xchg(&gib->alert_list_origin,
3142 (!final) ? NONE_GISA_ADDR : NULL_GISA_ADDR);
3143 /*
3144 * Loop through the just cut-off alert list and start the
3145 * gisa timers to kick idle vcpus to consume the pending
3146 * interruptions asap.
3147 */
3148 while (origin & GISA_ADDR_MASK) {
3149 gisa_phys = origin;
3150 gisa = phys_to_virt(gisa_phys);
3151 origin = gisa->next_alert;
3152 gisa->next_alert = gisa_phys;
3153 kvm = container_of(gisa, struct sie_page2, gisa)->kvm;
3154 gi = &kvm->arch.gisa_int;
3155 if (hrtimer_active(&gi->timer))
3156 hrtimer_cancel(&gi->timer);
3157 hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
3158 }
3159 } while (!final);
3160
3161 }
3162
kvm_s390_gisa_clear(struct kvm * kvm)3163 void kvm_s390_gisa_clear(struct kvm *kvm)
3164 {
3165 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3166
3167 if (!gi->origin)
3168 return;
3169 gisa_clear_ipm(gi->origin);
3170 VM_EVENT(kvm, 3, "gisa 0x%p cleared", gi->origin);
3171 }
3172
kvm_s390_gisa_init(struct kvm * kvm)3173 void kvm_s390_gisa_init(struct kvm *kvm)
3174 {
3175 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3176
3177 if (!css_general_characteristics.aiv)
3178 return;
3179 gi->origin = &kvm->arch.sie_page2->gisa;
3180 gi->alert.mask = 0;
3181 spin_lock_init(&gi->alert.ref_lock);
3182 gi->expires = 50 * 1000; /* 50 usec */
3183 hrtimer_setup(&gi->timer, gisa_vcpu_kicker, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
3184 memset(gi->origin, 0, sizeof(struct kvm_s390_gisa));
3185 gi->origin->next_alert = (u32)virt_to_phys(gi->origin);
3186 VM_EVENT(kvm, 3, "gisa 0x%p initialized", gi->origin);
3187 }
3188
kvm_s390_gisa_enable(struct kvm * kvm)3189 void kvm_s390_gisa_enable(struct kvm *kvm)
3190 {
3191 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3192 struct kvm_vcpu *vcpu;
3193 unsigned long i;
3194 u32 gisa_desc;
3195
3196 if (gi->origin)
3197 return;
3198 kvm_s390_gisa_init(kvm);
3199 gisa_desc = kvm_s390_get_gisa_desc(kvm);
3200 if (!gisa_desc)
3201 return;
3202 kvm_for_each_vcpu(i, vcpu, kvm) {
3203 mutex_lock(&vcpu->mutex);
3204 vcpu->arch.sie_block->gd = gisa_desc;
3205 vcpu->arch.sie_block->eca |= ECA_AIV;
3206 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u",
3207 vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id);
3208 mutex_unlock(&vcpu->mutex);
3209 }
3210 }
3211
kvm_s390_gisa_destroy(struct kvm * kvm)3212 void kvm_s390_gisa_destroy(struct kvm *kvm)
3213 {
3214 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3215 struct kvm_s390_gisa *gisa = gi->origin;
3216
3217 if (!gi->origin)
3218 return;
3219 WARN(gi->alert.mask != 0x00,
3220 "unexpected non zero alert.mask 0x%02x",
3221 gi->alert.mask);
3222 gi->alert.mask = 0x00;
3223 if (gisa_set_iam(gi->origin, gi->alert.mask))
3224 process_gib_alert_list();
3225 hrtimer_cancel(&gi->timer);
3226 gi->origin = NULL;
3227 VM_EVENT(kvm, 3, "gisa 0x%p destroyed", gisa);
3228 }
3229
kvm_s390_gisa_disable(struct kvm * kvm)3230 void kvm_s390_gisa_disable(struct kvm *kvm)
3231 {
3232 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3233 struct kvm_vcpu *vcpu;
3234 unsigned long i;
3235
3236 if (!gi->origin)
3237 return;
3238 kvm_for_each_vcpu(i, vcpu, kvm) {
3239 mutex_lock(&vcpu->mutex);
3240 vcpu->arch.sie_block->eca &= ~ECA_AIV;
3241 vcpu->arch.sie_block->gd = 0U;
3242 mutex_unlock(&vcpu->mutex);
3243 VCPU_EVENT(vcpu, 3, "AIV disabled for cpu %03u", vcpu->vcpu_id);
3244 }
3245 kvm_s390_gisa_destroy(kvm);
3246 }
3247
3248 /**
3249 * kvm_s390_gisc_register - register a guest ISC
3250 *
3251 * @kvm: the kernel vm to work with
3252 * @gisc: the guest interruption sub class to register
3253 *
3254 * The function extends the vm specific alert mask to use.
3255 * The effective IAM mask in the GISA is updated as well
3256 * in case the GISA is not part of the GIB alert list.
3257 * It will be updated latest when the IAM gets restored
3258 * by gisa_get_ipm_or_restore_iam().
3259 *
3260 * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3261 * has registered with the channel subsystem.
3262 * -ENODEV in case the vm uses no GISA
3263 * -ERANGE in case the guest ISC is invalid
3264 */
kvm_s390_gisc_register(struct kvm * kvm,u32 gisc)3265 int kvm_s390_gisc_register(struct kvm *kvm, u32 gisc)
3266 {
3267 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3268
3269 if (!gi->origin)
3270 return -ENODEV;
3271 if (gisc > MAX_ISC)
3272 return -ERANGE;
3273
3274 spin_lock(&gi->alert.ref_lock);
3275 gi->alert.ref_count[gisc]++;
3276 if (gi->alert.ref_count[gisc] == 1) {
3277 gi->alert.mask |= 0x80 >> gisc;
3278 gisa_set_iam(gi->origin, gi->alert.mask);
3279 }
3280 spin_unlock(&gi->alert.ref_lock);
3281
3282 return gib->nisc;
3283 }
3284 EXPORT_SYMBOL_GPL(kvm_s390_gisc_register);
3285
3286 /**
3287 * kvm_s390_gisc_unregister - unregister a guest ISC
3288 *
3289 * @kvm: the kernel vm to work with
3290 * @gisc: the guest interruption sub class to register
3291 *
3292 * The function reduces the vm specific alert mask to use.
3293 * The effective IAM mask in the GISA is updated as well
3294 * in case the GISA is not part of the GIB alert list.
3295 * It will be updated latest when the IAM gets restored
3296 * by gisa_get_ipm_or_restore_iam().
3297 *
3298 * Returns: the nonspecific ISC (NISC) the gib alert mechanism
3299 * has registered with the channel subsystem.
3300 * -ENODEV in case the vm uses no GISA
3301 * -ERANGE in case the guest ISC is invalid
3302 * -EINVAL in case the guest ISC is not registered
3303 */
kvm_s390_gisc_unregister(struct kvm * kvm,u32 gisc)3304 int kvm_s390_gisc_unregister(struct kvm *kvm, u32 gisc)
3305 {
3306 struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
3307 int rc = 0;
3308
3309 if (!gi->origin)
3310 return -ENODEV;
3311 if (gisc > MAX_ISC)
3312 return -ERANGE;
3313
3314 spin_lock(&gi->alert.ref_lock);
3315 if (gi->alert.ref_count[gisc] == 0) {
3316 rc = -EINVAL;
3317 goto out;
3318 }
3319 gi->alert.ref_count[gisc]--;
3320 if (gi->alert.ref_count[gisc] == 0) {
3321 gi->alert.mask &= ~(0x80 >> gisc);
3322 gisa_set_iam(gi->origin, gi->alert.mask);
3323 }
3324 out:
3325 spin_unlock(&gi->alert.ref_lock);
3326
3327 return rc;
3328 }
3329 EXPORT_SYMBOL_GPL(kvm_s390_gisc_unregister);
3330
aen_host_forward(unsigned long si)3331 static void aen_host_forward(unsigned long si)
3332 {
3333 struct kvm_s390_gisa_interrupt *gi;
3334 struct zpci_gaite *gaite;
3335 struct kvm *kvm;
3336
3337 gaite = (struct zpci_gaite *)aift->gait +
3338 (si * sizeof(struct zpci_gaite));
3339 if (gaite->count == 0)
3340 return;
3341 if (gaite->aisb != 0)
3342 set_bit_inv(gaite->aisbo, phys_to_virt(gaite->aisb));
3343
3344 kvm = kvm_s390_pci_si_to_kvm(aift, si);
3345 if (!kvm)
3346 return;
3347 gi = &kvm->arch.gisa_int;
3348
3349 if (!(gi->origin->g1.simm & AIS_MODE_MASK(gaite->gisc)) ||
3350 !(gi->origin->g1.nimm & AIS_MODE_MASK(gaite->gisc))) {
3351 gisa_set_ipm_gisc(gi->origin, gaite->gisc);
3352 if (hrtimer_active(&gi->timer))
3353 hrtimer_cancel(&gi->timer);
3354 hrtimer_start(&gi->timer, 0, HRTIMER_MODE_REL);
3355 kvm->stat.aen_forward++;
3356 }
3357 }
3358
aen_process_gait(u8 isc)3359 static void aen_process_gait(u8 isc)
3360 {
3361 bool found = false, first = true;
3362 union zpci_sic_iib iib = {{0}};
3363 unsigned long si, flags;
3364
3365 spin_lock_irqsave(&aift->gait_lock, flags);
3366
3367 if (!aift->gait) {
3368 spin_unlock_irqrestore(&aift->gait_lock, flags);
3369 return;
3370 }
3371
3372 for (si = 0;;) {
3373 /* Scan adapter summary indicator bit vector */
3374 si = airq_iv_scan(aift->sbv, si, airq_iv_end(aift->sbv));
3375 if (si == -1UL) {
3376 if (first || found) {
3377 /* Re-enable interrupts. */
3378 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, isc,
3379 &iib);
3380 first = found = false;
3381 } else {
3382 /* Interrupts on and all bits processed */
3383 break;
3384 }
3385 found = false;
3386 si = 0;
3387 /* Scan again after re-enabling interrupts */
3388 continue;
3389 }
3390 found = true;
3391 aen_host_forward(si);
3392 }
3393
3394 spin_unlock_irqrestore(&aift->gait_lock, flags);
3395 }
3396
gib_alert_irq_handler(struct airq_struct * airq,struct tpi_info * tpi_info)3397 static void gib_alert_irq_handler(struct airq_struct *airq,
3398 struct tpi_info *tpi_info)
3399 {
3400 struct tpi_adapter_info *info = (struct tpi_adapter_info *)tpi_info;
3401
3402 inc_irq_stat(IRQIO_GAL);
3403
3404 if ((info->forward || info->error) &&
3405 IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
3406 aen_process_gait(info->isc);
3407 if (info->aism != 0)
3408 process_gib_alert_list();
3409 } else {
3410 process_gib_alert_list();
3411 }
3412 }
3413
3414 static struct airq_struct gib_alert_irq = {
3415 .handler = gib_alert_irq_handler,
3416 };
3417
kvm_s390_gib_destroy(void)3418 void kvm_s390_gib_destroy(void)
3419 {
3420 if (!gib)
3421 return;
3422 if (kvm_s390_pci_interp_allowed() && aift) {
3423 mutex_lock(&aift->aift_lock);
3424 kvm_s390_pci_aen_exit();
3425 mutex_unlock(&aift->aift_lock);
3426 }
3427 chsc_sgib(0);
3428 unregister_adapter_interrupt(&gib_alert_irq);
3429 free_page((unsigned long)gib);
3430 gib = NULL;
3431 }
3432
kvm_s390_gib_init(u8 nisc)3433 int __init kvm_s390_gib_init(u8 nisc)
3434 {
3435 u32 gib_origin;
3436 int rc = 0;
3437
3438 if (!css_general_characteristics.aiv) {
3439 KVM_EVENT(3, "%s", "gib not initialized, no AIV facility");
3440 goto out;
3441 }
3442
3443 gib = (struct kvm_s390_gib *)get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA);
3444 if (!gib) {
3445 rc = -ENOMEM;
3446 goto out;
3447 }
3448
3449 gib_alert_irq.isc = nisc;
3450 if (register_adapter_interrupt(&gib_alert_irq)) {
3451 pr_err("Registering the GIB alert interruption handler failed\n");
3452 rc = -EIO;
3453 goto out_free_gib;
3454 }
3455 /* adapter interrupts used for AP (applicable here) don't use the LSI */
3456 *gib_alert_irq.lsi_ptr = 0xff;
3457
3458 gib->nisc = nisc;
3459 gib_origin = virt_to_phys(gib);
3460 if (chsc_sgib(gib_origin)) {
3461 pr_err("Associating the GIB with the AIV facility failed\n");
3462 free_page((unsigned long)gib);
3463 gib = NULL;
3464 rc = -EIO;
3465 goto out_unreg_gal;
3466 }
3467
3468 if (kvm_s390_pci_interp_allowed()) {
3469 if (kvm_s390_pci_aen_init(nisc)) {
3470 pr_err("Initializing AEN for PCI failed\n");
3471 rc = -EIO;
3472 goto out_unreg_gal;
3473 }
3474 }
3475
3476 KVM_EVENT(3, "gib 0x%p (nisc=%d) initialized", gib, gib->nisc);
3477 goto out;
3478
3479 out_unreg_gal:
3480 unregister_adapter_interrupt(&gib_alert_irq);
3481 out_free_gib:
3482 free_page((unsigned long)gib);
3483 gib = NULL;
3484 out:
3485 return rc;
3486 }
3487