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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}
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, u16 cpu_addr,
24 u64 *reg)
25{
26 struct kvm_s390_local_interrupt *li;
27 struct kvm_vcpu *dst_vcpu = NULL;
28 int cpuflags;
29 int rc;
30
31 if (cpu_addr >= KVM_MAX_VCPUS)
32 return SIGP_CC_NOT_OPERATIONAL;
33
34 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
35 if (!dst_vcpu)
36 return SIGP_CC_NOT_OPERATIONAL;
37 li = &dst_vcpu->arch.local_int;
38
39 cpuflags = atomic_read(li->cpuflags);
40 if (!(cpuflags & (CPUSTAT_ECALL_PEND | CPUSTAT_STOPPED)))
41 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
42 else {
43 *reg &= 0xffffffff00000000UL;
44 if (cpuflags & CPUSTAT_ECALL_PEND)
45 *reg |= SIGP_STATUS_EXT_CALL_PENDING;
46 if (cpuflags & CPUSTAT_STOPPED)
47 *reg |= SIGP_STATUS_STOPPED;
48 rc = SIGP_CC_STATUS_STORED;
49 }
50
51 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
52 return rc;
53}
54
55static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
56{
57 struct kvm_s390_local_interrupt *li;
58 struct kvm_s390_interrupt_info *inti;
59 struct kvm_vcpu *dst_vcpu = NULL;
60
61 if (cpu_addr < KVM_MAX_VCPUS)
62 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
63 if (!dst_vcpu)
64 return SIGP_CC_NOT_OPERATIONAL;
65
66 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
67 if (!inti)
68 return -ENOMEM;
69
70 inti->type = KVM_S390_INT_EMERGENCY;
71 inti->emerg.code = vcpu->vcpu_id;
72
73 li = &dst_vcpu->arch.local_int;
74 spin_lock_bh(&li->lock);
75 list_add_tail(&inti->list, &li->list);
76 atomic_set(&li->active, 1);
77 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
78 if (waitqueue_active(li->wq))
79 wake_up_interruptible(li->wq);
80 spin_unlock_bh(&li->lock);
81 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
82
83 return SIGP_CC_ORDER_CODE_ACCEPTED;
84}
85
86static int __sigp_conditional_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr,
87 u16 asn, u64 *reg)
88{
89 struct kvm_vcpu *dst_vcpu = NULL;
90 const u64 psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
91 u16 p_asn, s_asn;
92 psw_t *psw;
93 u32 flags;
94
95 if (cpu_addr < KVM_MAX_VCPUS)
96 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
97 if (!dst_vcpu)
98 return SIGP_CC_NOT_OPERATIONAL;
99 flags = atomic_read(&dst_vcpu->arch.sie_block->cpuflags);
100 psw = &dst_vcpu->arch.sie_block->gpsw;
101 p_asn = dst_vcpu->arch.sie_block->gcr[4] & 0xffff; /* Primary ASN */
102 s_asn = dst_vcpu->arch.sie_block->gcr[3] & 0xffff; /* Secondary ASN */
103
104 /* Deliver the emergency signal? */
105 if (!(flags & CPUSTAT_STOPPED)
106 || (psw->mask & psw_int_mask) != psw_int_mask
107 || ((flags & CPUSTAT_WAIT) && psw->addr != 0)
108 || (!(flags & CPUSTAT_WAIT) && (asn == p_asn || asn == s_asn))) {
109 return __sigp_emergency(vcpu, cpu_addr);
110 } else {
111 *reg &= 0xffffffff00000000UL;
112 *reg |= SIGP_STATUS_INCORRECT_STATE;
113 return SIGP_CC_STATUS_STORED;
114 }
115}
116
117static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
118{
119 struct kvm_s390_local_interrupt *li;
120 struct kvm_s390_interrupt_info *inti;
121 struct kvm_vcpu *dst_vcpu = NULL;
122
123 if (cpu_addr < KVM_MAX_VCPUS)
124 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
125 if (!dst_vcpu)
126 return SIGP_CC_NOT_OPERATIONAL;
127
128 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
129 if (!inti)
130 return -ENOMEM;
131
132 inti->type = KVM_S390_INT_EXTERNAL_CALL;
133 inti->extcall.code = vcpu->vcpu_id;
134
135 li = &dst_vcpu->arch.local_int;
136 spin_lock_bh(&li->lock);
137 list_add_tail(&inti->list, &li->list);
138 atomic_set(&li->active, 1);
139 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
140 if (waitqueue_active(li->wq))
141 wake_up_interruptible(li->wq);
142 spin_unlock_bh(&li->lock);
143 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
144
145 return SIGP_CC_ORDER_CODE_ACCEPTED;
146}
147
148static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
149{
150 struct kvm_s390_interrupt_info *inti;
151 int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
152
153 inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
154 if (!inti)
155 return -ENOMEM;
156 inti->type = KVM_S390_SIGP_STOP;
157
158 spin_lock_bh(&li->lock);
159 if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
160 kfree(inti);
161 if ((action & ACTION_STORE_ON_STOP) != 0)
162 rc = -ESHUTDOWN;
163 goto out;
164 }
165 list_add_tail(&inti->list, &li->list);
166 atomic_set(&li->active, 1);
167 atomic_set_mask(CPUSTAT_STOP_INT, li->cpuflags);
168 li->action_bits |= action;
169 if (waitqueue_active(li->wq))
170 wake_up_interruptible(li->wq);
171out:
172 spin_unlock_bh(&li->lock);
173
174 return rc;
175}
176
177static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
178{
179 struct kvm_s390_local_interrupt *li;
180 struct kvm_vcpu *dst_vcpu = NULL;
181 int rc;
182
183 if (cpu_addr >= KVM_MAX_VCPUS)
184 return SIGP_CC_NOT_OPERATIONAL;
185
186 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
187 if (!dst_vcpu)
188 return SIGP_CC_NOT_OPERATIONAL;
189 li = &dst_vcpu->arch.local_int;
190
191 rc = __inject_sigp_stop(li, action);
192
193 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
194
195 if ((action & ACTION_STORE_ON_STOP) != 0 && rc == -ESHUTDOWN) {
196 /* If the CPU has already been stopped, we still have
197 * to save the status when doing stop-and-store. This
198 * has to be done after unlocking all spinlocks. */
199 rc = kvm_s390_store_status_unloaded(dst_vcpu,
200 KVM_S390_STORE_STATUS_NOADDR);
201 }
202
203 return rc;
204}
205
206static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
207{
208 int rc;
209 unsigned int i;
210 struct kvm_vcpu *v;
211
212 switch (parameter & 0xff) {
213 case 0:
214 rc = SIGP_CC_NOT_OPERATIONAL;
215 break;
216 case 1:
217 case 2:
218 kvm_for_each_vcpu(i, v, vcpu->kvm) {
219 v->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
220 kvm_clear_async_pf_completion_queue(v);
221 }
222
223 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
224 break;
225 default:
226 rc = -EOPNOTSUPP;
227 }
228 return rc;
229}
230
231static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
232 u64 *reg)
233{
234 struct kvm_s390_local_interrupt *li;
235 struct kvm_vcpu *dst_vcpu = NULL;
236 struct kvm_s390_interrupt_info *inti;
237 int rc;
238 u8 tmp;
239
240 if (cpu_addr < KVM_MAX_VCPUS)
241 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
242 if (!dst_vcpu)
243 return SIGP_CC_NOT_OPERATIONAL;
244 li = &dst_vcpu->arch.local_int;
245
246 /* make sure that the new value is valid memory */
247 address = address & 0x7fffe000u;
248 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
249 copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
250 *reg &= 0xffffffff00000000UL;
251 *reg |= SIGP_STATUS_INVALID_PARAMETER;
252 return SIGP_CC_STATUS_STORED;
253 }
254
255 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
256 if (!inti)
257 return SIGP_CC_BUSY;
258
259 spin_lock_bh(&li->lock);
260 /* cpu must be in stopped state */
261 if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
262 *reg &= 0xffffffff00000000UL;
263 *reg |= SIGP_STATUS_INCORRECT_STATE;
264 rc = SIGP_CC_STATUS_STORED;
265 kfree(inti);
266 goto out_li;
267 }
268
269 inti->type = KVM_S390_SIGP_SET_PREFIX;
270 inti->prefix.address = address;
271
272 list_add_tail(&inti->list, &li->list);
273 atomic_set(&li->active, 1);
274 if (waitqueue_active(li->wq))
275 wake_up_interruptible(li->wq);
276 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
277
278 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
279out_li:
280 spin_unlock_bh(&li->lock);
281 return rc;
282}
283
284static int __sigp_store_status_at_addr(struct kvm_vcpu *vcpu, u16 cpu_id,
285 u32 addr, u64 *reg)
286{
287 struct kvm_vcpu *dst_vcpu = NULL;
288 int flags;
289 int rc;
290
291 if (cpu_id < KVM_MAX_VCPUS)
292 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_id);
293 if (!dst_vcpu)
294 return SIGP_CC_NOT_OPERATIONAL;
295
296 spin_lock_bh(&dst_vcpu->arch.local_int.lock);
297 flags = atomic_read(dst_vcpu->arch.local_int.cpuflags);
298 spin_unlock_bh(&dst_vcpu->arch.local_int.lock);
299 if (!(flags & CPUSTAT_STOPPED)) {
300 *reg &= 0xffffffff00000000UL;
301 *reg |= SIGP_STATUS_INCORRECT_STATE;
302 return SIGP_CC_STATUS_STORED;
303 }
304
305 addr &= 0x7ffffe00;
306 rc = kvm_s390_store_status_unloaded(dst_vcpu, addr);
307 if (rc == -EFAULT) {
308 *reg &= 0xffffffff00000000UL;
309 *reg |= SIGP_STATUS_INVALID_PARAMETER;
310 rc = SIGP_CC_STATUS_STORED;
311 }
312 return rc;
313}
314
315static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
316 u64 *reg)
317{
318 struct kvm_s390_local_interrupt *li;
319 struct kvm_vcpu *dst_vcpu = NULL;
320 int rc;
321
322 if (cpu_addr >= KVM_MAX_VCPUS)
323 return SIGP_CC_NOT_OPERATIONAL;
324
325 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
326 if (!dst_vcpu)
327 return SIGP_CC_NOT_OPERATIONAL;
328 li = &dst_vcpu->arch.local_int;
329 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
330 /* running */
331 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
332 } else {
333 /* not running */
334 *reg &= 0xffffffff00000000UL;
335 *reg |= SIGP_STATUS_NOT_RUNNING;
336 rc = SIGP_CC_STATUS_STORED;
337 }
338
339 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
340 rc);
341
342 return rc;
343}
344
345/* Test whether the destination CPU is available and not busy */
346static int sigp_check_callable(struct kvm_vcpu *vcpu, u16 cpu_addr)
347{
348 struct kvm_s390_local_interrupt *li;
349 int rc = SIGP_CC_ORDER_CODE_ACCEPTED;
350 struct kvm_vcpu *dst_vcpu = NULL;
351
352 if (cpu_addr >= KVM_MAX_VCPUS)
353 return SIGP_CC_NOT_OPERATIONAL;
354
355 dst_vcpu = kvm_get_vcpu(vcpu->kvm, cpu_addr);
356 if (!dst_vcpu)
357 return SIGP_CC_NOT_OPERATIONAL;
358 li = &dst_vcpu->arch.local_int;
359 spin_lock_bh(&li->lock);
360 if (li->action_bits & ACTION_STOP_ON_STOP)
361 rc = SIGP_CC_BUSY;
362 spin_unlock_bh(&li->lock);
363
364 return rc;
365}
366
367int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
368{
369 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
370 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
371 u32 parameter;
372 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
373 u8 order_code;
374 int rc;
375
376 /* sigp in userspace can exit */
377 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
378 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
379
380 order_code = kvm_s390_get_base_disp_rs(vcpu);
381
382 if (r1 % 2)
383 parameter = vcpu->run->s.regs.gprs[r1];
384 else
385 parameter = vcpu->run->s.regs.gprs[r1 + 1];
386
387 trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
388 switch (order_code) {
389 case SIGP_SENSE:
390 vcpu->stat.instruction_sigp_sense++;
391 rc = __sigp_sense(vcpu, cpu_addr,
392 &vcpu->run->s.regs.gprs[r1]);
393 break;
394 case SIGP_EXTERNAL_CALL:
395 vcpu->stat.instruction_sigp_external_call++;
396 rc = __sigp_external_call(vcpu, cpu_addr);
397 break;
398 case SIGP_EMERGENCY_SIGNAL:
399 vcpu->stat.instruction_sigp_emergency++;
400 rc = __sigp_emergency(vcpu, cpu_addr);
401 break;
402 case SIGP_STOP:
403 vcpu->stat.instruction_sigp_stop++;
404 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
405 break;
406 case SIGP_STOP_AND_STORE_STATUS:
407 vcpu->stat.instruction_sigp_stop++;
408 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP |
409 ACTION_STOP_ON_STOP);
410 break;
411 case SIGP_STORE_STATUS_AT_ADDRESS:
412 rc = __sigp_store_status_at_addr(vcpu, cpu_addr, parameter,
413 &vcpu->run->s.regs.gprs[r1]);
414 break;
415 case SIGP_SET_ARCHITECTURE:
416 vcpu->stat.instruction_sigp_arch++;
417 rc = __sigp_set_arch(vcpu, parameter);
418 break;
419 case SIGP_SET_PREFIX:
420 vcpu->stat.instruction_sigp_prefix++;
421 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
422 &vcpu->run->s.regs.gprs[r1]);
423 break;
424 case SIGP_COND_EMERGENCY_SIGNAL:
425 rc = __sigp_conditional_emergency(vcpu, cpu_addr, parameter,
426 &vcpu->run->s.regs.gprs[r1]);
427 break;
428 case SIGP_SENSE_RUNNING:
429 vcpu->stat.instruction_sigp_sense_running++;
430 rc = __sigp_sense_running(vcpu, cpu_addr,
431 &vcpu->run->s.regs.gprs[r1]);
432 break;
433 case SIGP_START:
434 rc = sigp_check_callable(vcpu, cpu_addr);
435 if (rc == SIGP_CC_ORDER_CODE_ACCEPTED)
436 rc = -EOPNOTSUPP; /* Handle START in user space */
437 break;
438 case SIGP_RESTART:
439 vcpu->stat.instruction_sigp_restart++;
440 rc = sigp_check_callable(vcpu, cpu_addr);
441 if (rc == SIGP_CC_ORDER_CODE_ACCEPTED) {
442 VCPU_EVENT(vcpu, 4,
443 "sigp restart %x to handle userspace",
444 cpu_addr);
445 /* user space must know about restart */
446 rc = -EOPNOTSUPP;
447 }
448 break;
449 default:
450 return -EOPNOTSUPP;
451 }
452
453 if (rc < 0)
454 return rc;
455
456 kvm_s390_set_psw_cc(vcpu, rc);
457 return 0;
458}