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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// 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}