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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * handling interprocessor communication
4 *
5 * Copyright IBM Corp. 2008, 2013
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Christian Borntraeger <borntraeger@de.ibm.com>
9 * Christian Ehrhardt <ehrhardt@de.ibm.com>
10 */
11
12#include <linux/kvm.h>
13#include <linux/kvm_host.h>
14#include <linux/slab.h>
15#include <asm/sigp.h>
16#include "gaccess.h"
17#include "kvm-s390.h"
18#include "trace.h"
19
20static int __sigp_sense(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
21 u64 *reg)
22{
23 const bool stopped = kvm_s390_test_cpuflags(dst_vcpu, CPUSTAT_STOPPED);
24 int rc;
25 int ext_call_pending;
26
27 ext_call_pending = kvm_s390_ext_call_pending(dst_vcpu);
28 if (!stopped && !ext_call_pending)
29 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
30 else {
31 *reg &= 0xffffffff00000000UL;
32 if (ext_call_pending)
33 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
34 if (stopped)
35 *reg |= SIGP_STATUS_STOPPED;
36 rc = SIGP_CC_STATUS_STORED;
37 }
38
39 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", dst_vcpu->vcpu_id,
40 rc);
41 return rc;
42}
43
44static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
45 struct kvm_vcpu *dst_vcpu)
46{
47 struct kvm_s390_irq irq = {
48 .type = KVM_S390_INT_EMERGENCY,
49 .u.emerg.code = vcpu->vcpu_id,
50 };
51 int rc = 0;
52
53 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
54 if (!rc)
55 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
56 dst_vcpu->vcpu_id);
57
58 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
59}
60
61static int __sigp_emergency(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
62{
63 return __inject_sigp_emergency(vcpu, dst_vcpu);
64}
65
66static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
67 struct kvm_vcpu *dst_vcpu,
68 u16 asn, u64 *reg)
69{
70 const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
71 u16 p_asn, s_asn;
72 psw_t *psw;
73 bool idle;
74
75 idle = is_vcpu_idle(vcpu);
76 psw = &dst_vcpu->arch.sie_block->gpsw;
77 p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
78 s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
79
80 /* Inject the emergency signal? */
81 if (!is_vcpu_stopped(vcpu)
82 || (psw->mask & psw_int_mask) != psw_int_mask
83 || (idle && psw->addr != 0)
84 || (!idle && (asn == p_asn || asn == s_asn))) {
85 return __inject_sigp_emergency(vcpu, dst_vcpu);
86 } else {
87 *reg &= 0xffffffff00000000UL;
88 *reg |= SIGP_STATUS_INCORRECT_STATE;
89 return SIGP_CC_STATUS_STORED;
90 }
91}
92
93static int __sigp_external_call(struct kvm_vcpu *vcpu,
94 struct kvm_vcpu *dst_vcpu, u64 *reg)
95{
96 struct kvm_s390_irq irq = {
97 .type = KVM_S390_INT_EXTERNAL_CALL,
98 .u.extcall.code = vcpu->vcpu_id,
99 };
100 int rc;
101
102 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
103 if (rc == -EBUSY) {
104 *reg &= 0xffffffff00000000UL;
105 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
106 return SIGP_CC_STATUS_STORED;
107 } else if (rc == 0) {
108 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x",
109 dst_vcpu->vcpu_id);
110 }
111
112 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
113}
114
115static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
116{
117 struct kvm_s390_irq irq = {
118 .type = KVM_S390_SIGP_STOP,
119 };
120 int rc;
121
122 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
123 if (rc == -EBUSY)
124 rc = SIGP_CC_BUSY;
125 else if (rc == 0)
126 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
127 dst_vcpu->vcpu_id);
128
129 return rc;
130}
131
132static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
133 struct kvm_vcpu *dst_vcpu, u64 *reg)
134{
135 struct kvm_s390_irq irq = {
136 .type = KVM_S390_SIGP_STOP,
137 .u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
138 };
139 int rc;
140
141 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
142 if (rc == -EBUSY)
143 rc = SIGP_CC_BUSY;
144 else if (rc == 0)
145 VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
146 dst_vcpu->vcpu_id);
147
148 return rc;
149}
150
151static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter,
152 u64 *status_reg)
153{
154 *status_reg &= 0xffffffff00000000UL;
155
156 /* Reject set arch order, with czam we're always in z/Arch mode. */
157 *status_reg |= SIGP_STATUS_INVALID_PARAMETER;
158 return SIGP_CC_STATUS_STORED;
159}
160
161static int __sigp_set_prefix(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
162 u32 address, u64 *reg)
163{
164 struct kvm_s390_irq irq = {
165 .type = KVM_S390_SIGP_SET_PREFIX,
166 .u.prefix.address = address & 0x7fffe000u,
167 };
168 int rc;
169
170 /*
171 * Make sure the new value is valid memory. We only need to check the
172 * first page, since address is 8k aligned and memory pieces are always
173 * at least 1MB aligned and have at least a size of 1MB.
174 */
175 if (!kvm_is_gpa_in_memslot(vcpu->kvm, irq.u.prefix.address)) {
176 *reg &= 0xffffffff00000000UL;
177 *reg |= SIGP_STATUS_INVALID_PARAMETER;
178 return SIGP_CC_STATUS_STORED;
179 }
180
181 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
182 if (rc == -EBUSY) {
183 *reg &= 0xffffffff00000000UL;
184 *reg |= SIGP_STATUS_INCORRECT_STATE;
185 return SIGP_CC_STATUS_STORED;
186 }
187
188 return rc;
189}
190
191static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
192 struct kvm_vcpu *dst_vcpu,
193 u32 addr, u64 *reg)
194{
195 int rc;
196
197 if (!kvm_s390_test_cpuflags(dst_vcpu, CPUSTAT_STOPPED)) {
198 *reg &= 0xffffffff00000000UL;
199 *reg |= SIGP_STATUS_INCORRECT_STATE;
200 return SIGP_CC_STATUS_STORED;
201 }
202
203 addr &= 0x7ffffe00;
204 rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
205 if (rc == -EFAULT) {
206 *reg &= 0xffffffff00000000UL;
207 *reg |= SIGP_STATUS_INVALID_PARAMETER;
208 rc = SIGP_CC_STATUS_STORED;
209 }
210 return rc;
211}
212
213static int __sigp_sense_running(struct kvm_vcpu *vcpu,
214 struct kvm_vcpu *dst_vcpu, u64 *reg)
215{
216 int rc;
217
218 if (!test_kvm_facility(vcpu->kvm, 9)) {
219 *reg &= 0xffffffff00000000UL;
220 *reg |= SIGP_STATUS_INVALID_ORDER;
221 return SIGP_CC_STATUS_STORED;
222 }
223
224 if (kvm_s390_test_cpuflags(dst_vcpu, CPUSTAT_RUNNING)) {
225 /* running */
226 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
227 } else {
228 /* not running */
229 *reg &= 0xffffffff00000000UL;
230 *reg |= SIGP_STATUS_NOT_RUNNING;
231 rc = SIGP_CC_STATUS_STORED;
232 }
233
234 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
235 dst_vcpu->vcpu_id, rc);
236
237 return rc;
238}
239
240static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
241 struct kvm_vcpu *dst_vcpu, u8 order_code)
242{
243 struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
244 /* handle (RE)START in user space */
245 int rc = -EOPNOTSUPP;
246
247 /* make sure we don't race with STOP irq injection */
248 spin_lock(&li->lock);
249 if (kvm_s390_is_stop_irq_pending(dst_vcpu))
250 rc = SIGP_CC_BUSY;
251 spin_unlock(&li->lock);
252
253 return rc;
254}
255
256static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
257 struct kvm_vcpu *dst_vcpu, u8 order_code)
258{
259 /* handle (INITIAL) CPU RESET in user space */
260 return -EOPNOTSUPP;
261}
262
263static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
264 struct kvm_vcpu *dst_vcpu)
265{
266 /* handle unknown orders in user space */
267 return -EOPNOTSUPP;
268}
269
270static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
271 u16 cpu_addr, u32 parameter, u64 *status_reg)
272{
273 int rc;
274 struct kvm_vcpu *dst_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
275
276 if (!dst_vcpu)
277 return SIGP_CC_NOT_OPERATIONAL;
278
279 /*
280 * SIGP RESTART, SIGP STOP, and SIGP STOP AND STORE STATUS orders
281 * are processed asynchronously. Until the affected VCPU finishes
282 * its work and calls back into KVM to clear the (RESTART or STOP)
283 * interrupt, we need to return any new non-reset orders "busy".
284 *
285 * This is important because a single VCPU could issue:
286 * 1) SIGP STOP $DESTINATION
287 * 2) SIGP SENSE $DESTINATION
288 *
289 * If the SIGP SENSE would not be rejected as "busy", it could
290 * return an incorrect answer as to whether the VCPU is STOPPED
291 * or OPERATING.
292 */
293 if (order_code != SIGP_INITIAL_CPU_RESET &&
294 order_code != SIGP_CPU_RESET) {
295 /*
296 * Lockless check. Both SIGP STOP and SIGP (RE)START
297 * properly synchronize everything while processing
298 * their orders, while the guest cannot observe a
299 * difference when issuing other orders from two
300 * different VCPUs.
301 */
302 if (kvm_s390_is_stop_irq_pending(dst_vcpu) ||
303 kvm_s390_is_restart_irq_pending(dst_vcpu))
304 return SIGP_CC_BUSY;
305 }
306
307 switch (order_code) {
308 case SIGP_SENSE:
309 vcpu->stat.instruction_sigp_sense++;
310 rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
311 break;
312 case SIGP_EXTERNAL_CALL:
313 vcpu->stat.instruction_sigp_external_call++;
314 rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
315 break;
316 case SIGP_EMERGENCY_SIGNAL:
317 vcpu->stat.instruction_sigp_emergency++;
318 rc = __sigp_emergency(vcpu, dst_vcpu);
319 break;
320 case SIGP_STOP:
321 vcpu->stat.instruction_sigp_stop++;
322 rc = __sigp_stop(vcpu, dst_vcpu);
323 break;
324 case SIGP_STOP_AND_STORE_STATUS:
325 vcpu->stat.instruction_sigp_stop_store_status++;
326 rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
327 break;
328 case SIGP_STORE_STATUS_AT_ADDRESS:
329 vcpu->stat.instruction_sigp_store_status++;
330 rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
331 status_reg);
332 break;
333 case SIGP_SET_PREFIX:
334 vcpu->stat.instruction_sigp_prefix++;
335 rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
336 break;
337 case SIGP_COND_EMERGENCY_SIGNAL:
338 vcpu->stat.instruction_sigp_cond_emergency++;
339 rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
340 status_reg);
341 break;
342 case SIGP_SENSE_RUNNING:
343 vcpu->stat.instruction_sigp_sense_running++;
344 rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
345 break;
346 case SIGP_START:
347 vcpu->stat.instruction_sigp_start++;
348 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
349 break;
350 case SIGP_RESTART:
351 vcpu->stat.instruction_sigp_restart++;
352 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
353 break;
354 case SIGP_INITIAL_CPU_RESET:
355 vcpu->stat.instruction_sigp_init_cpu_reset++;
356 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
357 break;
358 case SIGP_CPU_RESET:
359 vcpu->stat.instruction_sigp_cpu_reset++;
360 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
361 break;
362 default:
363 vcpu->stat.instruction_sigp_unknown++;
364 rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
365 }
366
367 if (rc == -EOPNOTSUPP)
368 VCPU_EVENT(vcpu, 4,
369 "sigp order %u -> cpu %x: handled in user space",
370 order_code, dst_vcpu->vcpu_id);
371
372 return rc;
373}
374
375static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code,
376 u16 cpu_addr)
377{
378 if (!vcpu->kvm->arch.user_sigp)
379 return 0;
380
381 switch (order_code) {
382 case SIGP_SENSE:
383 case SIGP_EXTERNAL_CALL:
384 case SIGP_EMERGENCY_SIGNAL:
385 case SIGP_COND_EMERGENCY_SIGNAL:
386 case SIGP_SENSE_RUNNING:
387 return 0;
388 /* update counters as we're directly dropping to user space */
389 case SIGP_STOP:
390 vcpu->stat.instruction_sigp_stop++;
391 break;
392 case SIGP_STOP_AND_STORE_STATUS:
393 vcpu->stat.instruction_sigp_stop_store_status++;
394 break;
395 case SIGP_STORE_STATUS_AT_ADDRESS:
396 vcpu->stat.instruction_sigp_store_status++;
397 break;
398 case SIGP_STORE_ADDITIONAL_STATUS:
399 vcpu->stat.instruction_sigp_store_adtl_status++;
400 break;
401 case SIGP_SET_PREFIX:
402 vcpu->stat.instruction_sigp_prefix++;
403 break;
404 case SIGP_START:
405 vcpu->stat.instruction_sigp_start++;
406 break;
407 case SIGP_RESTART:
408 vcpu->stat.instruction_sigp_restart++;
409 break;
410 case SIGP_INITIAL_CPU_RESET:
411 vcpu->stat.instruction_sigp_init_cpu_reset++;
412 break;
413 case SIGP_CPU_RESET:
414 vcpu->stat.instruction_sigp_cpu_reset++;
415 break;
416 default:
417 vcpu->stat.instruction_sigp_unknown++;
418 }
419 VCPU_EVENT(vcpu, 3, "SIGP: order %u for CPU %d handled in userspace",
420 order_code, cpu_addr);
421
422 return 1;
423}
424
425int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
426{
427 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
428 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
429 u32 parameter;
430 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
431 u8 order_code;
432 int rc;
433
434 /* sigp in userspace can exit */
435 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
436 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
437
438 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
439 if (handle_sigp_order_in_user_space(vcpu, order_code, cpu_addr))
440 return -EOPNOTSUPP;
441
442 if (r1 % 2)
443 parameter = vcpu->run->s.regs.gprs[r1];
444 else
445 parameter = vcpu->run->s.regs.gprs[r1 + 1];
446
447 trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
448 switch (order_code) {
449 case SIGP_SET_ARCHITECTURE:
450 vcpu->stat.instruction_sigp_arch++;
451 rc = __sigp_set_arch(vcpu, parameter,
452 &vcpu->run->s.regs.gprs[r1]);
453 break;
454 default:
455 rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
456 parameter,
457 &vcpu->run->s.regs.gprs[r1]);
458 }
459
460 if (rc < 0)
461 return rc;
462
463 kvm_s390_set_psw_cc(vcpu, rc);
464 return 0;
465}
466
467/*
468 * Handle SIGP partial execution interception.
469 *
470 * This interception will occur at the source cpu when a source cpu sends an
471 * external call to a target cpu and the target cpu has the WAIT bit set in
472 * its cpuflags. Interception will occur after the interrupt indicator bits at
473 * the target cpu have been set. All error cases will lead to instruction
474 * interception, therefore nothing is to be checked or prepared.
475 */
476int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
477{
478 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
479 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
480 struct kvm_vcpu *dest_vcpu;
481 u8 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
482
483 if (order_code == SIGP_EXTERNAL_CALL) {
484 trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
485
486 dest_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
487 BUG_ON(dest_vcpu == NULL);
488
489 kvm_s390_vcpu_wakeup(dest_vcpu);
490 kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
491 return 0;
492 }
493
494 return -EOPNOTSUPP;
495}
1/*
2 * handling interprocessor communication
3 *
4 * Copyright IBM Corp. 2008, 2013
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License (version 2 only)
8 * as published by the Free Software Foundation.
9 *
10 * Author(s): Carsten Otte <cotte@de.ibm.com>
11 * Christian Borntraeger <borntraeger@de.ibm.com>
12 * Christian Ehrhardt <ehrhardt@de.ibm.com>
13 */
14
15#include <linux/kvm.h>
16#include <linux/kvm_host.h>
17#include <linux/slab.h>
18#include <asm/sigp.h>
19#include "gaccess.h"
20#include "kvm-s390.h"
21#include "trace.h"
22
23static int __sigp_sense(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
24 u64 *reg)
25{
26 struct kvm_s390_local_interrupt *li;
27 int cpuflags;
28 int rc;
29 int ext_call_pending;
30
31 li = &dst_vcpu->arch.local_int;
32
33 cpuflags = atomic_read(li->cpuflags);
34 ext_call_pending = kvm_s390_ext_call_pending(dst_vcpu);
35 if (!(cpuflags & CPUSTAT_STOPPED) && !ext_call_pending)
36 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
37 else {
38 *reg &= 0xffffffff00000000UL;
39 if (ext_call_pending)
40 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
41 if (cpuflags & CPUSTAT_STOPPED)
42 *reg |= SIGP_STATUS_STOPPED;
43 rc = SIGP_CC_STATUS_STORED;
44 }
45
46 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", dst_vcpu->vcpu_id,
47 rc);
48 return rc;
49}
50
51static int __inject_sigp_emergency(struct kvm_vcpu *vcpu,
52 struct kvm_vcpu *dst_vcpu)
53{
54 struct kvm_s390_irq irq = {
55 .type = KVM_S390_INT_EMERGENCY,
56 .u.emerg.code = vcpu->vcpu_id,
57 };
58 int rc = 0;
59
60 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
61 if (!rc)
62 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x",
63 dst_vcpu->vcpu_id);
64
65 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
66}
67
68static int __sigp_emergency(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
69{
70 return __inject_sigp_emergency(vcpu, dst_vcpu);
71}
72
73static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu,
74 struct kvm_vcpu *dst_vcpu,
75 u16 asn, u64 *reg)
76{
77 const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
78 u16 p_asn, s_asn;
79 psw_t *psw;
80 u32 flags;
81
82 flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
83 psw = &dst_vcpu->arch.sie_block->gpsw;
84 p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
85 s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
86
87 /* Inject the emergency signal? */
88 if (!(flags & CPUSTAT_STOPPED)
89 || (psw->mask & psw_int_mask) != psw_int_mask
90 || ((flags & CPUSTAT_WAIT) && psw->addr != 0)
91 || (!(flags & CPUSTAT_WAIT) && (asn == p_asn || asn == s_asn))) {
92 return __inject_sigp_emergency(vcpu, dst_vcpu);
93 } else {
94 *reg &= 0xffffffff00000000UL;
95 *reg |= SIGP_STATUS_INCORRECT_STATE;
96 return SIGP_CC_STATUS_STORED;
97 }
98}
99
100static int __sigp_external_call(struct kvm_vcpu *vcpu,
101 struct kvm_vcpu *dst_vcpu, u64 *reg)
102{
103 struct kvm_s390_irq irq = {
104 .type = KVM_S390_INT_EXTERNAL_CALL,
105 .u.extcall.code = vcpu->vcpu_id,
106 };
107 int rc;
108
109 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
110 if (rc == -EBUSY) {
111 *reg &= 0xffffffff00000000UL;
112 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
113 return SIGP_CC_STATUS_STORED;
114 } else if (rc == 0) {
115 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x",
116 dst_vcpu->vcpu_id);
117 }
118
119 return rc ? rc : SIGP_CC_ORDER_CODE_ACCEPTED;
120}
121
122static int __sigp_stop(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu)
123{
124 struct kvm_s390_irq irq = {
125 .type = KVM_S390_SIGP_STOP,
126 };
127 int rc;
128
129 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
130 if (rc == -EBUSY)
131 rc = SIGP_CC_BUSY;
132 else if (rc == 0)
133 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x",
134 dst_vcpu->vcpu_id);
135
136 return rc;
137}
138
139static int __sigp_stop_and_store_status(struct kvm_vcpu *vcpu,
140 struct kvm_vcpu *dst_vcpu, u64 *reg)
141{
142 struct kvm_s390_irq irq = {
143 .type = KVM_S390_SIGP_STOP,
144 .u.stop.flags = KVM_S390_STOP_FLAG_STORE_STATUS,
145 };
146 int rc;
147
148 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
149 if (rc == -EBUSY)
150 rc = SIGP_CC_BUSY;
151 else if (rc == 0)
152 VCPU_EVENT(vcpu, 4, "sent sigp stop and store status to cpu %x",
153 dst_vcpu->vcpu_id);
154
155 return rc;
156}
157
158static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
159{
160 int rc;
161 unsigned int i;
162 struct kvm_vcpu *v;
163
164 switch (parameter & 0xff) {
165 case 0:
166 rc = SIGP_CC_NOT_OPERATIONAL;
167 break;
168 case 1:
169 case 2:
170 kvm_for_each_vcpu(i, v, vcpu->kvm) {
171 v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
172 kvm_clear_async_pf_completion_queue(v);
173 }
174
175 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
176 break;
177 default:
178 rc = -EOPNOTSUPP;
179 }
180 return rc;
181}
182
183static int __sigp_set_prefix(struct kvm_vcpu *vcpu, struct kvm_vcpu *dst_vcpu,
184 u32 address, u64 *reg)
185{
186 struct kvm_s390_irq irq = {
187 .type = KVM_S390_SIGP_SET_PREFIX,
188 .u.prefix.address = address & 0x7fffe000u,
189 };
190 int rc;
191
192 /*
193 * Make sure the new value is valid memory. We only need to check the
194 * first page, since address is 8k aligned and memory pieces are always
195 * at least 1MB aligned and have at least a size of 1MB.
196 */
197 if (kvm_is_error_gpa(vcpu->kvm, irq.u.prefix.address)) {
198 *reg &= 0xffffffff00000000UL;
199 *reg |= SIGP_STATUS_INVALID_PARAMETER;
200 return SIGP_CC_STATUS_STORED;
201 }
202
203 rc = kvm_s390_inject_vcpu(dst_vcpu, &irq);
204 if (rc == -EBUSY) {
205 *reg &= 0xffffffff00000000UL;
206 *reg |= SIGP_STATUS_INCORRECT_STATE;
207 return SIGP_CC_STATUS_STORED;
208 }
209
210 return rc;
211}
212
213static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu,
214 struct kvm_vcpu *dst_vcpu,
215 u32 addr, u64 *reg)
216{
217 int flags;
218 int rc;
219
220 flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
221 if (!(flags & CPUSTAT_STOPPED)) {
222 *reg &= 0xffffffff00000000UL;
223 *reg |= SIGP_STATUS_INCORRECT_STATE;
224 return SIGP_CC_STATUS_STORED;
225 }
226
227 addr &= 0x7ffffe00;
228 rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
229 if (rc == -EFAULT) {
230 *reg &= 0xffffffff00000000UL;
231 *reg |= SIGP_STATUS_INVALID_PARAMETER;
232 rc = SIGP_CC_STATUS_STORED;
233 }
234 return rc;
235}
236
237static int __sigp_sense_running(struct kvm_vcpu *vcpu,
238 struct kvm_vcpu *dst_vcpu, u64 *reg)
239{
240 struct kvm_s390_local_interrupt *li;
241 int rc;
242
243 li = &dst_vcpu->arch.local_int;
244 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
245 /* running */
246 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
247 } else {
248 /* not running */
249 *reg &= 0xffffffff00000000UL;
250 *reg |= SIGP_STATUS_NOT_RUNNING;
251 rc = SIGP_CC_STATUS_STORED;
252 }
253
254 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
255 dst_vcpu->vcpu_id, rc);
256
257 return rc;
258}
259
260static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
261 struct kvm_vcpu *dst_vcpu, u8 order_code)
262{
263 struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
264 /* handle (RE)START in user space */
265 int rc = -EOPNOTSUPP;
266
267 /* make sure we don't race with STOP irq injection */
268 spin_lock(&li->lock);
269 if (kvm_s390_is_stop_irq_pending(dst_vcpu))
270 rc = SIGP_CC_BUSY;
271 spin_unlock(&li->lock);
272
273 return rc;
274}
275
276static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
277 struct kvm_vcpu *dst_vcpu, u8 order_code)
278{
279 /* handle (INITIAL) CPU RESET in user space */
280 return -EOPNOTSUPP;
281}
282
283static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
284 struct kvm_vcpu *dst_vcpu)
285{
286 /* handle unknown orders in user space */
287 return -EOPNOTSUPP;
288}
289
290static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
291 u16 cpu_addr, u32 parameter, u64 *status_reg)
292{
293 int rc;
294 struct kvm_vcpu *dst_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
295
296 if (!dst_vcpu)
297 return SIGP_CC_NOT_OPERATIONAL;
298
299 switch (order_code) {
300 case SIGP_SENSE:
301 vcpu->stat.instruction_sigp_sense++;
302 rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
303 break;
304 case SIGP_EXTERNAL_CALL:
305 vcpu->stat.instruction_sigp_external_call++;
306 rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
307 break;
308 case SIGP_EMERGENCY_SIGNAL:
309 vcpu->stat.instruction_sigp_emergency++;
310 rc = __sigp_emergency(vcpu, dst_vcpu);
311 break;
312 case SIGP_STOP:
313 vcpu->stat.instruction_sigp_stop++;
314 rc = __sigp_stop(vcpu, dst_vcpu);
315 break;
316 case SIGP_STOP_AND_STORE_STATUS:
317 vcpu->stat.instruction_sigp_stop_store_status++;
318 rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
319 break;
320 case SIGP_STORE_STATUS_AT_ADDRESS:
321 vcpu->stat.instruction_sigp_store_status++;
322 rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
323 status_reg);
324 break;
325 case SIGP_SET_PREFIX:
326 vcpu->stat.instruction_sigp_prefix++;
327 rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
328 break;
329 case SIGP_COND_EMERGENCY_SIGNAL:
330 vcpu->stat.instruction_sigp_cond_emergency++;
331 rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
332 status_reg);
333 break;
334 case SIGP_SENSE_RUNNING:
335 vcpu->stat.instruction_sigp_sense_running++;
336 rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
337 break;
338 case SIGP_START:
339 vcpu->stat.instruction_sigp_start++;
340 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
341 break;
342 case SIGP_RESTART:
343 vcpu->stat.instruction_sigp_restart++;
344 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
345 break;
346 case SIGP_INITIAL_CPU_RESET:
347 vcpu->stat.instruction_sigp_init_cpu_reset++;
348 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
349 break;
350 case SIGP_CPU_RESET:
351 vcpu->stat.instruction_sigp_cpu_reset++;
352 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
353 break;
354 default:
355 vcpu->stat.instruction_sigp_unknown++;
356 rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
357 }
358
359 if (rc == -EOPNOTSUPP)
360 VCPU_EVENT(vcpu, 4,
361 "sigp order %u -> cpu %x: handled in user space",
362 order_code, dst_vcpu->vcpu_id);
363
364 return rc;
365}
366
367static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code,
368 u16 cpu_addr)
369{
370 if (!vcpu->kvm->arch.user_sigp)
371 return 0;
372
373 switch (order_code) {
374 case SIGP_SENSE:
375 case SIGP_EXTERNAL_CALL:
376 case SIGP_EMERGENCY_SIGNAL:
377 case SIGP_COND_EMERGENCY_SIGNAL:
378 case SIGP_SENSE_RUNNING:
379 return 0;
380 /* update counters as we're directly dropping to user space */
381 case SIGP_STOP:
382 vcpu->stat.instruction_sigp_stop++;
383 break;
384 case SIGP_STOP_AND_STORE_STATUS:
385 vcpu->stat.instruction_sigp_stop_store_status++;
386 break;
387 case SIGP_STORE_STATUS_AT_ADDRESS:
388 vcpu->stat.instruction_sigp_store_status++;
389 break;
390 case SIGP_STORE_ADDITIONAL_STATUS:
391 vcpu->stat.instruction_sigp_store_adtl_status++;
392 break;
393 case SIGP_SET_PREFIX:
394 vcpu->stat.instruction_sigp_prefix++;
395 break;
396 case SIGP_START:
397 vcpu->stat.instruction_sigp_start++;
398 break;
399 case SIGP_RESTART:
400 vcpu->stat.instruction_sigp_restart++;
401 break;
402 case SIGP_INITIAL_CPU_RESET:
403 vcpu->stat.instruction_sigp_init_cpu_reset++;
404 break;
405 case SIGP_CPU_RESET:
406 vcpu->stat.instruction_sigp_cpu_reset++;
407 break;
408 default:
409 vcpu->stat.instruction_sigp_unknown++;
410 }
411 VCPU_EVENT(vcpu, 3, "SIGP: order %u for CPU %d handled in userspace",
412 order_code, cpu_addr);
413
414 return 1;
415}
416
417int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
418{
419 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
420 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
421 u32 parameter;
422 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
423 u8 order_code;
424 int rc;
425
426 /* sigp in userspace can exit */
427 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
428 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
429
430 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
431 if (handle_sigp_order_in_user_space(vcpu, order_code, cpu_addr))
432 return -EOPNOTSUPP;
433
434 if (r1 % 2)
435 parameter = vcpu->run->s.regs.gprs[r1];
436 else
437 parameter = vcpu->run->s.regs.gprs[r1 + 1];
438
439 trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
440 switch (order_code) {
441 case SIGP_SET_ARCHITECTURE:
442 vcpu->stat.instruction_sigp_arch++;
443 rc = __sigp_set_arch(vcpu, parameter);
444 break;
445 default:
446 rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
447 parameter,
448 &vcpu->run->s.regs.gprs[r1]);
449 }
450
451 if (rc < 0)
452 return rc;
453
454 kvm_s390_set_psw_cc(vcpu, rc);
455 return 0;
456}
457
458/*
459 * Handle SIGP partial execution interception.
460 *
461 * This interception will occur at the source cpu when a source cpu sends an
462 * external call to a target cpu and the target cpu has the WAIT bit set in
463 * its cpuflags. Interception will occurr after the interrupt indicator bits at
464 * the target cpu have been set. All error cases will lead to instruction
465 * interception, therefore nothing is to be checked or prepared.
466 */
467int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
468{
469 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
470 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
471 struct kvm_vcpu *dest_vcpu;
472 u8 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
473
474 trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
475
476 if (order_code == SIGP_EXTERNAL_CALL) {
477 dest_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
478 BUG_ON(dest_vcpu == NULL);
479
480 kvm_s390_vcpu_wakeup(dest_vcpu);
481 kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
482 return 0;
483 }
484
485 return -EOPNOTSUPP;
486}