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1/*
2 * sigp.c - handlinge interprocessor communication
3 *
4 * Copyright IBM Corp. 2008,2009
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 "gaccess.h"
19#include "kvm-s390.h"
20
21/* sigp order codes */
22#define SIGP_SENSE 0x01
23#define SIGP_EXTERNAL_CALL 0x02
24#define SIGP_EMERGENCY 0x03
25#define SIGP_START 0x04
26#define SIGP_STOP 0x05
27#define SIGP_RESTART 0x06
28#define SIGP_STOP_STORE_STATUS 0x09
29#define SIGP_INITIAL_CPU_RESET 0x0b
30#define SIGP_CPU_RESET 0x0c
31#define SIGP_SET_PREFIX 0x0d
32#define SIGP_STORE_STATUS_ADDR 0x0e
33#define SIGP_SET_ARCH 0x12
34#define SIGP_SENSE_RUNNING 0x15
35
36/* cpu status bits */
37#define SIGP_STAT_EQUIPMENT_CHECK 0x80000000UL
38#define SIGP_STAT_NOT_RUNNING 0x00000400UL
39#define SIGP_STAT_INCORRECT_STATE 0x00000200UL
40#define SIGP_STAT_INVALID_PARAMETER 0x00000100UL
41#define SIGP_STAT_EXT_CALL_PENDING 0x00000080UL
42#define SIGP_STAT_STOPPED 0x00000040UL
43#define SIGP_STAT_OPERATOR_INTERV 0x00000020UL
44#define SIGP_STAT_CHECK_STOP 0x00000010UL
45#define SIGP_STAT_INOPERATIVE 0x00000004UL
46#define SIGP_STAT_INVALID_ORDER 0x00000002UL
47#define SIGP_STAT_RECEIVER_CHECK 0x00000001UL
48
49
50static int __sigp_sense(struct kvm_vcpu *vcpu, u16 cpu_addr,
51 u64 *reg)
52{
53 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
54 int rc;
55
56 if (cpu_addr >= KVM_MAX_VCPUS)
57 return 3; /* not operational */
58
59 spin_lock(&fi->lock);
60 if (fi->local_int[cpu_addr] == NULL)
61 rc = 3; /* not operational */
62 else if (!(atomic_read(fi->local_int[cpu_addr]->cpuflags)
63 & CPUSTAT_STOPPED)) {
64 *reg &= 0xffffffff00000000UL;
65 rc = 1; /* status stored */
66 } else {
67 *reg &= 0xffffffff00000000UL;
68 *reg |= SIGP_STAT_STOPPED;
69 rc = 1; /* status stored */
70 }
71 spin_unlock(&fi->lock);
72
73 VCPU_EVENT(vcpu, 4, "sensed status of cpu %x rc %x", cpu_addr, rc);
74 return rc;
75}
76
77static int __sigp_emergency(struct kvm_vcpu *vcpu, u16 cpu_addr)
78{
79 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
80 struct kvm_s390_local_interrupt *li;
81 struct kvm_s390_interrupt_info *inti;
82 int rc;
83
84 if (cpu_addr >= KVM_MAX_VCPUS)
85 return 3; /* not operational */
86
87 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
88 if (!inti)
89 return -ENOMEM;
90
91 inti->type = KVM_S390_INT_EMERGENCY;
92 inti->emerg.code = vcpu->vcpu_id;
93
94 spin_lock(&fi->lock);
95 li = fi->local_int[cpu_addr];
96 if (li == NULL) {
97 rc = 3; /* not operational */
98 kfree(inti);
99 goto unlock;
100 }
101 spin_lock_bh(&li->lock);
102 list_add_tail(&inti->list, &li->list);
103 atomic_set(&li->active, 1);
104 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
105 if (waitqueue_active(&li->wq))
106 wake_up_interruptible(&li->wq);
107 spin_unlock_bh(&li->lock);
108 rc = 0; /* order accepted */
109 VCPU_EVENT(vcpu, 4, "sent sigp emerg to cpu %x", cpu_addr);
110unlock:
111 spin_unlock(&fi->lock);
112 return rc;
113}
114
115static int __sigp_external_call(struct kvm_vcpu *vcpu, u16 cpu_addr)
116{
117 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
118 struct kvm_s390_local_interrupt *li;
119 struct kvm_s390_interrupt_info *inti;
120 int rc;
121
122 if (cpu_addr >= KVM_MAX_VCPUS)
123 return 3; /* not operational */
124
125 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
126 if (!inti)
127 return -ENOMEM;
128
129 inti->type = KVM_S390_INT_EXTERNAL_CALL;
130 inti->extcall.code = vcpu->vcpu_id;
131
132 spin_lock(&fi->lock);
133 li = fi->local_int[cpu_addr];
134 if (li == NULL) {
135 rc = 3; /* not operational */
136 kfree(inti);
137 goto unlock;
138 }
139 spin_lock_bh(&li->lock);
140 list_add_tail(&inti->list, &li->list);
141 atomic_set(&li->active, 1);
142 atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags);
143 if (waitqueue_active(&li->wq))
144 wake_up_interruptible(&li->wq);
145 spin_unlock_bh(&li->lock);
146 rc = 0; /* order accepted */
147 VCPU_EVENT(vcpu, 4, "sent sigp ext call to cpu %x", cpu_addr);
148unlock:
149 spin_unlock(&fi->lock);
150 return rc;
151}
152
153static int __inject_sigp_stop(struct kvm_s390_local_interrupt *li, int action)
154{
155 struct kvm_s390_interrupt_info *inti;
156
157 inti = kzalloc(sizeof(*inti), GFP_ATOMIC);
158 if (!inti)
159 return -ENOMEM;
160 inti->type = KVM_S390_SIGP_STOP;
161
162 spin_lock_bh(&li->lock);
163 if ((atomic_read(li->cpuflags) & CPUSTAT_STOPPED))
164 goto out;
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 0; /* order accepted */
175}
176
177static int __sigp_stop(struct kvm_vcpu *vcpu, u16 cpu_addr, int action)
178{
179 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
180 struct kvm_s390_local_interrupt *li;
181 int rc;
182
183 if (cpu_addr >= KVM_MAX_VCPUS)
184 return 3; /* not operational */
185
186 spin_lock(&fi->lock);
187 li = fi->local_int[cpu_addr];
188 if (li == NULL) {
189 rc = 3; /* not operational */
190 goto unlock;
191 }
192
193 rc = __inject_sigp_stop(li, action);
194
195unlock:
196 spin_unlock(&fi->lock);
197 VCPU_EVENT(vcpu, 4, "sent sigp stop to cpu %x", cpu_addr);
198 return rc;
199}
200
201int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int action)
202{
203 struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
204 return __inject_sigp_stop(li, action);
205}
206
207static int __sigp_set_arch(struct kvm_vcpu *vcpu, u32 parameter)
208{
209 int rc;
210
211 switch (parameter & 0xff) {
212 case 0:
213 rc = 3; /* not operational */
214 break;
215 case 1:
216 case 2:
217 rc = 0; /* order accepted */
218 break;
219 default:
220 rc = -EOPNOTSUPP;
221 }
222 return rc;
223}
224
225static int __sigp_set_prefix(struct kvm_vcpu *vcpu, u16 cpu_addr, u32 address,
226 u64 *reg)
227{
228 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
229 struct kvm_s390_local_interrupt *li = NULL;
230 struct kvm_s390_interrupt_info *inti;
231 int rc;
232 u8 tmp;
233
234 /* make sure that the new value is valid memory */
235 address = address & 0x7fffe000u;
236 if (copy_from_guest_absolute(vcpu, &tmp, address, 1) ||
237 copy_from_guest_absolute(vcpu, &tmp, address + PAGE_SIZE, 1)) {
238 *reg |= SIGP_STAT_INVALID_PARAMETER;
239 return 1; /* invalid parameter */
240 }
241
242 inti = kzalloc(sizeof(*inti), GFP_KERNEL);
243 if (!inti)
244 return 2; /* busy */
245
246 spin_lock(&fi->lock);
247 if (cpu_addr < KVM_MAX_VCPUS)
248 li = fi->local_int[cpu_addr];
249
250 if (li == NULL) {
251 rc = 1; /* incorrect state */
252 *reg &= SIGP_STAT_INCORRECT_STATE;
253 kfree(inti);
254 goto out_fi;
255 }
256
257 spin_lock_bh(&li->lock);
258 /* cpu must be in stopped state */
259 if (!(atomic_read(li->cpuflags) & CPUSTAT_STOPPED)) {
260 rc = 1; /* incorrect state */
261 *reg &= SIGP_STAT_INCORRECT_STATE;
262 kfree(inti);
263 goto out_li;
264 }
265
266 inti->type = KVM_S390_SIGP_SET_PREFIX;
267 inti->prefix.address = address;
268
269 list_add_tail(&inti->list, &li->list);
270 atomic_set(&li->active, 1);
271 if (waitqueue_active(&li->wq))
272 wake_up_interruptible(&li->wq);
273 rc = 0; /* order accepted */
274
275 VCPU_EVENT(vcpu, 4, "set prefix of cpu %02x to %x", cpu_addr, address);
276out_li:
277 spin_unlock_bh(&li->lock);
278out_fi:
279 spin_unlock(&fi->lock);
280 return rc;
281}
282
283static int __sigp_sense_running(struct kvm_vcpu *vcpu, u16 cpu_addr,
284 u64 *reg)
285{
286 int rc;
287 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
288
289 if (cpu_addr >= KVM_MAX_VCPUS)
290 return 3; /* not operational */
291
292 spin_lock(&fi->lock);
293 if (fi->local_int[cpu_addr] == NULL)
294 rc = 3; /* not operational */
295 else {
296 if (atomic_read(fi->local_int[cpu_addr]->cpuflags)
297 & CPUSTAT_RUNNING) {
298 /* running */
299 rc = 1;
300 } else {
301 /* not running */
302 *reg &= 0xffffffff00000000UL;
303 *reg |= SIGP_STAT_NOT_RUNNING;
304 rc = 0;
305 }
306 }
307 spin_unlock(&fi->lock);
308
309 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x", cpu_addr,
310 rc);
311
312 return rc;
313}
314
315static int __sigp_restart(struct kvm_vcpu *vcpu, u16 cpu_addr)
316{
317 int rc = 0;
318 struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
319 struct kvm_s390_local_interrupt *li;
320
321 if (cpu_addr >= KVM_MAX_VCPUS)
322 return 3; /* not operational */
323
324 spin_lock(&fi->lock);
325 li = fi->local_int[cpu_addr];
326 if (li == NULL) {
327 rc = 3; /* not operational */
328 goto out;
329 }
330
331 spin_lock_bh(&li->lock);
332 if (li->action_bits & ACTION_STOP_ON_STOP)
333 rc = 2; /* busy */
334 else
335 VCPU_EVENT(vcpu, 4, "sigp restart %x to handle userspace",
336 cpu_addr);
337 spin_unlock_bh(&li->lock);
338out:
339 spin_unlock(&fi->lock);
340 return rc;
341}
342
343int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
344{
345 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
346 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
347 int base2 = vcpu->arch.sie_block->ipb >> 28;
348 int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
349 u32 parameter;
350 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
351 u8 order_code;
352 int rc;
353
354 /* sigp in userspace can exit */
355 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
356 return kvm_s390_inject_program_int(vcpu,
357 PGM_PRIVILEGED_OPERATION);
358
359 order_code = disp2;
360 if (base2)
361 order_code += vcpu->run->s.regs.gprs[base2];
362
363 if (r1 % 2)
364 parameter = vcpu->run->s.regs.gprs[r1];
365 else
366 parameter = vcpu->run->s.regs.gprs[r1 + 1];
367
368 switch (order_code) {
369 case SIGP_SENSE:
370 vcpu->stat.instruction_sigp_sense++;
371 rc = __sigp_sense(vcpu, cpu_addr,
372 &vcpu->run->s.regs.gprs[r1]);
373 break;
374 case SIGP_EXTERNAL_CALL:
375 vcpu->stat.instruction_sigp_external_call++;
376 rc = __sigp_external_call(vcpu, cpu_addr);
377 break;
378 case SIGP_EMERGENCY:
379 vcpu->stat.instruction_sigp_emergency++;
380 rc = __sigp_emergency(vcpu, cpu_addr);
381 break;
382 case SIGP_STOP:
383 vcpu->stat.instruction_sigp_stop++;
384 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STOP_ON_STOP);
385 break;
386 case SIGP_STOP_STORE_STATUS:
387 vcpu->stat.instruction_sigp_stop++;
388 rc = __sigp_stop(vcpu, cpu_addr, ACTION_STORE_ON_STOP |
389 ACTION_STOP_ON_STOP);
390 break;
391 case SIGP_SET_ARCH:
392 vcpu->stat.instruction_sigp_arch++;
393 rc = __sigp_set_arch(vcpu, parameter);
394 break;
395 case SIGP_SET_PREFIX:
396 vcpu->stat.instruction_sigp_prefix++;
397 rc = __sigp_set_prefix(vcpu, cpu_addr, parameter,
398 &vcpu->run->s.regs.gprs[r1]);
399 break;
400 case SIGP_SENSE_RUNNING:
401 vcpu->stat.instruction_sigp_sense_running++;
402 rc = __sigp_sense_running(vcpu, cpu_addr,
403 &vcpu->run->s.regs.gprs[r1]);
404 break;
405 case SIGP_RESTART:
406 vcpu->stat.instruction_sigp_restart++;
407 rc = __sigp_restart(vcpu, cpu_addr);
408 if (rc == 2) /* busy */
409 break;
410 /* user space must know about restart */
411 default:
412 return -EOPNOTSUPP;
413 }
414
415 if (rc < 0)
416 return rc;
417
418 vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
419 vcpu->arch.sie_block->gpsw.mask |= (rc & 3ul) << 44;
420 return 0;
421}
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 bool idle;
81
82 idle = is_vcpu_idle(vcpu);
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 (!is_vcpu_stopped(vcpu)
89 || (psw->mask & psw_int_mask) != psw_int_mask
90 || (idle && psw->addr != 0)
91 || (!idle && (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 if (!test_kvm_facility(vcpu->kvm, 9)) {
244 *reg &= 0xffffffff00000000UL;
245 *reg |= SIGP_STATUS_INVALID_ORDER;
246 return SIGP_CC_STATUS_STORED;
247 }
248
249 li = &dst_vcpu->arch.local_int;
250 if (atomic_read(li->cpuflags) & CPUSTAT_RUNNING) {
251 /* running */
252 rc = SIGP_CC_ORDER_CODE_ACCEPTED;
253 } else {
254 /* not running */
255 *reg &= 0xffffffff00000000UL;
256 *reg |= SIGP_STATUS_NOT_RUNNING;
257 rc = SIGP_CC_STATUS_STORED;
258 }
259
260 VCPU_EVENT(vcpu, 4, "sensed running status of cpu %x rc %x",
261 dst_vcpu->vcpu_id, rc);
262
263 return rc;
264}
265
266static int __prepare_sigp_re_start(struct kvm_vcpu *vcpu,
267 struct kvm_vcpu *dst_vcpu, u8 order_code)
268{
269 struct kvm_s390_local_interrupt *li = &dst_vcpu->arch.local_int;
270 /* handle (RE)START in user space */
271 int rc = -EOPNOTSUPP;
272
273 /* make sure we don't race with STOP irq injection */
274 spin_lock(&li->lock);
275 if (kvm_s390_is_stop_irq_pending(dst_vcpu))
276 rc = SIGP_CC_BUSY;
277 spin_unlock(&li->lock);
278
279 return rc;
280}
281
282static int __prepare_sigp_cpu_reset(struct kvm_vcpu *vcpu,
283 struct kvm_vcpu *dst_vcpu, u8 order_code)
284{
285 /* handle (INITIAL) CPU RESET in user space */
286 return -EOPNOTSUPP;
287}
288
289static int __prepare_sigp_unknown(struct kvm_vcpu *vcpu,
290 struct kvm_vcpu *dst_vcpu)
291{
292 /* handle unknown orders in user space */
293 return -EOPNOTSUPP;
294}
295
296static int handle_sigp_dst(struct kvm_vcpu *vcpu, u8 order_code,
297 u16 cpu_addr, u32 parameter, u64 *status_reg)
298{
299 int rc;
300 struct kvm_vcpu *dst_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
301
302 if (!dst_vcpu)
303 return SIGP_CC_NOT_OPERATIONAL;
304
305 switch (order_code) {
306 case SIGP_SENSE:
307 vcpu->stat.instruction_sigp_sense++;
308 rc = __sigp_sense(vcpu, dst_vcpu, status_reg);
309 break;
310 case SIGP_EXTERNAL_CALL:
311 vcpu->stat.instruction_sigp_external_call++;
312 rc = __sigp_external_call(vcpu, dst_vcpu, status_reg);
313 break;
314 case SIGP_EMERGENCY_SIGNAL:
315 vcpu->stat.instruction_sigp_emergency++;
316 rc = __sigp_emergency(vcpu, dst_vcpu);
317 break;
318 case SIGP_STOP:
319 vcpu->stat.instruction_sigp_stop++;
320 rc = __sigp_stop(vcpu, dst_vcpu);
321 break;
322 case SIGP_STOP_AND_STORE_STATUS:
323 vcpu->stat.instruction_sigp_stop_store_status++;
324 rc = __sigp_stop_and_store_status(vcpu, dst_vcpu, status_reg);
325 break;
326 case SIGP_STORE_STATUS_AT_ADDRESS:
327 vcpu->stat.instruction_sigp_store_status++;
328 rc = __sigp_store_status_at_addr(vcpu, dst_vcpu, parameter,
329 status_reg);
330 break;
331 case SIGP_SET_PREFIX:
332 vcpu->stat.instruction_sigp_prefix++;
333 rc = __sigp_set_prefix(vcpu, dst_vcpu, parameter, status_reg);
334 break;
335 case SIGP_COND_EMERGENCY_SIGNAL:
336 vcpu->stat.instruction_sigp_cond_emergency++;
337 rc = __sigp_conditional_emergency(vcpu, dst_vcpu, parameter,
338 status_reg);
339 break;
340 case SIGP_SENSE_RUNNING:
341 vcpu->stat.instruction_sigp_sense_running++;
342 rc = __sigp_sense_running(vcpu, dst_vcpu, status_reg);
343 break;
344 case SIGP_START:
345 vcpu->stat.instruction_sigp_start++;
346 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
347 break;
348 case SIGP_RESTART:
349 vcpu->stat.instruction_sigp_restart++;
350 rc = __prepare_sigp_re_start(vcpu, dst_vcpu, order_code);
351 break;
352 case SIGP_INITIAL_CPU_RESET:
353 vcpu->stat.instruction_sigp_init_cpu_reset++;
354 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
355 break;
356 case SIGP_CPU_RESET:
357 vcpu->stat.instruction_sigp_cpu_reset++;
358 rc = __prepare_sigp_cpu_reset(vcpu, dst_vcpu, order_code);
359 break;
360 default:
361 vcpu->stat.instruction_sigp_unknown++;
362 rc = __prepare_sigp_unknown(vcpu, dst_vcpu);
363 }
364
365 if (rc == -EOPNOTSUPP)
366 VCPU_EVENT(vcpu, 4,
367 "sigp order %u -> cpu %x: handled in user space",
368 order_code, dst_vcpu->vcpu_id);
369
370 return rc;
371}
372
373static int handle_sigp_order_in_user_space(struct kvm_vcpu *vcpu, u8 order_code,
374 u16 cpu_addr)
375{
376 if (!vcpu->kvm->arch.user_sigp)
377 return 0;
378
379 switch (order_code) {
380 case SIGP_SENSE:
381 case SIGP_EXTERNAL_CALL:
382 case SIGP_EMERGENCY_SIGNAL:
383 case SIGP_COND_EMERGENCY_SIGNAL:
384 case SIGP_SENSE_RUNNING:
385 return 0;
386 /* update counters as we're directly dropping to user space */
387 case SIGP_STOP:
388 vcpu->stat.instruction_sigp_stop++;
389 break;
390 case SIGP_STOP_AND_STORE_STATUS:
391 vcpu->stat.instruction_sigp_stop_store_status++;
392 break;
393 case SIGP_STORE_STATUS_AT_ADDRESS:
394 vcpu->stat.instruction_sigp_store_status++;
395 break;
396 case SIGP_STORE_ADDITIONAL_STATUS:
397 vcpu->stat.instruction_sigp_store_adtl_status++;
398 break;
399 case SIGP_SET_PREFIX:
400 vcpu->stat.instruction_sigp_prefix++;
401 break;
402 case SIGP_START:
403 vcpu->stat.instruction_sigp_start++;
404 break;
405 case SIGP_RESTART:
406 vcpu->stat.instruction_sigp_restart++;
407 break;
408 case SIGP_INITIAL_CPU_RESET:
409 vcpu->stat.instruction_sigp_init_cpu_reset++;
410 break;
411 case SIGP_CPU_RESET:
412 vcpu->stat.instruction_sigp_cpu_reset++;
413 break;
414 default:
415 vcpu->stat.instruction_sigp_unknown++;
416 }
417 VCPU_EVENT(vcpu, 3, "SIGP: order %u for CPU %d handled in userspace",
418 order_code, cpu_addr);
419
420 return 1;
421}
422
423int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu)
424{
425 int r1 = (vcpu->arch.sie_block->ipa & 0x00f0) >> 4;
426 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
427 u32 parameter;
428 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
429 u8 order_code;
430 int rc;
431
432 /* sigp in userspace can exit */
433 if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
434 return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
435
436 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
437 if (handle_sigp_order_in_user_space(vcpu, order_code, cpu_addr))
438 return -EOPNOTSUPP;
439
440 if (r1 % 2)
441 parameter = vcpu->run->s.regs.gprs[r1];
442 else
443 parameter = vcpu->run->s.regs.gprs[r1 + 1];
444
445 trace_kvm_s390_handle_sigp(vcpu, order_code, cpu_addr, parameter);
446 switch (order_code) {
447 case SIGP_SET_ARCHITECTURE:
448 vcpu->stat.instruction_sigp_arch++;
449 rc = __sigp_set_arch(vcpu, parameter);
450 break;
451 default:
452 rc = handle_sigp_dst(vcpu, order_code, cpu_addr,
453 parameter,
454 &vcpu->run->s.regs.gprs[r1]);
455 }
456
457 if (rc < 0)
458 return rc;
459
460 kvm_s390_set_psw_cc(vcpu, rc);
461 return 0;
462}
463
464/*
465 * Handle SIGP partial execution interception.
466 *
467 * This interception will occur at the source cpu when a source cpu sends an
468 * external call to a target cpu and the target cpu has the WAIT bit set in
469 * its cpuflags. Interception will occurr after the interrupt indicator bits at
470 * the target cpu have been set. All error cases will lead to instruction
471 * interception, therefore nothing is to be checked or prepared.
472 */
473int kvm_s390_handle_sigp_pei(struct kvm_vcpu *vcpu)
474{
475 int r3 = vcpu->arch.sie_block->ipa & 0x000f;
476 u16 cpu_addr = vcpu->run->s.regs.gprs[r3];
477 struct kvm_vcpu *dest_vcpu;
478 u8 order_code = kvm_s390_get_base_disp_rs(vcpu, NULL);
479
480 trace_kvm_s390_handle_sigp_pei(vcpu, order_code, cpu_addr);
481
482 if (order_code == SIGP_EXTERNAL_CALL) {
483 dest_vcpu = kvm_get_vcpu_by_id(vcpu->kvm, cpu_addr);
484 BUG_ON(dest_vcpu == NULL);
485
486 kvm_s390_vcpu_wakeup(dest_vcpu);
487 kvm_s390_set_psw_cc(vcpu, SIGP_CC_ORDER_CODE_ACCEPTED);
488 return 0;
489 }
490
491 return -EOPNOTSUPP;
492}