1 /*
2 * s390x SIGP instruction handling
3 *
4 * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
5 * Copyright IBM Corp. 2012
6 *
7 * This work is licensed under the terms of the GNU GPL, version 2 or later.
8 * See the COPYING file in the top-level directory.
9 */
10
11 #include "qemu/osdep.h"
12 #include "cpu.h"
13 #include "s390x-internal.h"
14 #include "hw/boards.h"
15 #include "sysemu/hw_accel.h"
16 #include "sysemu/runstate.h"
17 #include "exec/address-spaces.h"
18 #include "exec/exec-all.h"
19 #include "sysemu/tcg.h"
20 #include "trace.h"
21 #include "qapi/qapi-types-machine.h"
22
23 QemuMutex qemu_sigp_mutex;
24
25 typedef struct SigpInfo {
26 uint64_t param;
27 int cc;
28 uint64_t *status_reg;
29 } SigpInfo;
30
set_sigp_status(SigpInfo * si,uint64_t status)31 static void set_sigp_status(SigpInfo *si, uint64_t status)
32 {
33 *si->status_reg &= 0xffffffff00000000ULL;
34 *si->status_reg |= status;
35 si->cc = SIGP_CC_STATUS_STORED;
36 }
37
sigp_sense(S390CPU * dst_cpu,SigpInfo * si)38 static void sigp_sense(S390CPU *dst_cpu, SigpInfo *si)
39 {
40 uint8_t state = s390_cpu_get_state(dst_cpu);
41 bool ext_call = dst_cpu->env.pending_int & INTERRUPT_EXTERNAL_CALL;
42 uint64_t status = 0;
43
44 if (!tcg_enabled()) {
45 /* handled in KVM */
46 set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
47 return;
48 }
49
50 /* sensing without locks is racy, but it's the same for real hw */
51 if (state != S390_CPU_STATE_STOPPED && !ext_call) {
52 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
53 } else {
54 if (ext_call) {
55 status |= SIGP_STAT_EXT_CALL_PENDING;
56 }
57 if (state == S390_CPU_STATE_STOPPED) {
58 status |= SIGP_STAT_STOPPED;
59 }
60 set_sigp_status(si, status);
61 }
62 }
63
sigp_external_call(S390CPU * src_cpu,S390CPU * dst_cpu,SigpInfo * si)64 static void sigp_external_call(S390CPU *src_cpu, S390CPU *dst_cpu, SigpInfo *si)
65 {
66 int ret;
67
68 if (!tcg_enabled()) {
69 /* handled in KVM */
70 set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
71 return;
72 }
73
74 ret = cpu_inject_external_call(dst_cpu, src_cpu->env.core_id);
75 if (!ret) {
76 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
77 } else {
78 set_sigp_status(si, SIGP_STAT_EXT_CALL_PENDING);
79 }
80 }
81
sigp_emergency(S390CPU * src_cpu,S390CPU * dst_cpu,SigpInfo * si)82 static void sigp_emergency(S390CPU *src_cpu, S390CPU *dst_cpu, SigpInfo *si)
83 {
84 if (!tcg_enabled()) {
85 /* handled in KVM */
86 set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
87 return;
88 }
89
90 cpu_inject_emergency_signal(dst_cpu, src_cpu->env.core_id);
91 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
92 }
93
sigp_start(CPUState * cs,run_on_cpu_data arg)94 static void sigp_start(CPUState *cs, run_on_cpu_data arg)
95 {
96 S390CPU *cpu = S390_CPU(cs);
97 SigpInfo *si = arg.host_ptr;
98
99 if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) {
100 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
101 return;
102 }
103
104 s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
105 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
106 }
107
sigp_stop(CPUState * cs,run_on_cpu_data arg)108 static void sigp_stop(CPUState *cs, run_on_cpu_data arg)
109 {
110 S390CPU *cpu = S390_CPU(cs);
111 SigpInfo *si = arg.host_ptr;
112
113 if (s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
114 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
115 return;
116 }
117
118 /* disabled wait - sleeping in user space */
119 if (cs->halted) {
120 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
121 } else {
122 /* execute the stop function */
123 cpu->env.sigp_order = SIGP_STOP;
124 cpu_inject_stop(cpu);
125 }
126 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
127 }
128
sigp_stop_and_store_status(CPUState * cs,run_on_cpu_data arg)129 static void sigp_stop_and_store_status(CPUState *cs, run_on_cpu_data arg)
130 {
131 S390CPU *cpu = S390_CPU(cs);
132 SigpInfo *si = arg.host_ptr;
133
134 /* disabled wait - sleeping in user space */
135 if (s390_cpu_get_state(cpu) == S390_CPU_STATE_OPERATING && cs->halted) {
136 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
137 }
138
139 switch (s390_cpu_get_state(cpu)) {
140 case S390_CPU_STATE_OPERATING:
141 cpu->env.sigp_order = SIGP_STOP_STORE_STATUS;
142 cpu_inject_stop(cpu);
143 /* store will be performed in do_stop_interrupt() */
144 break;
145 case S390_CPU_STATE_STOPPED:
146 /* already stopped, just store the status */
147 cpu_synchronize_state(cs);
148 s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
149 break;
150 }
151 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
152 }
153
sigp_store_status_at_address(CPUState * cs,run_on_cpu_data arg)154 static void sigp_store_status_at_address(CPUState *cs, run_on_cpu_data arg)
155 {
156 S390CPU *cpu = S390_CPU(cs);
157 SigpInfo *si = arg.host_ptr;
158 uint32_t address = si->param & 0x7ffffe00u;
159
160 /* cpu has to be stopped */
161 if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) {
162 set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
163 return;
164 }
165
166 cpu_synchronize_state(cs);
167
168 if (s390_store_status(cpu, address, false)) {
169 set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
170 return;
171 }
172 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
173 }
174
175 #define ADTL_SAVE_LC_MASK 0xfUL
sigp_store_adtl_status(CPUState * cs,run_on_cpu_data arg)176 static void sigp_store_adtl_status(CPUState *cs, run_on_cpu_data arg)
177 {
178 S390CPU *cpu = S390_CPU(cs);
179 SigpInfo *si = arg.host_ptr;
180 uint8_t lc = si->param & ADTL_SAVE_LC_MASK;
181 hwaddr addr = si->param & ~ADTL_SAVE_LC_MASK;
182 hwaddr len = 1UL << (lc ? lc : 10);
183
184 if (!s390_has_feat(S390_FEAT_VECTOR) &&
185 !s390_has_feat(S390_FEAT_GUARDED_STORAGE)) {
186 set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
187 return;
188 }
189
190 /* cpu has to be stopped */
191 if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) {
192 set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
193 return;
194 }
195
196 /* address must be aligned to length */
197 if (addr & (len - 1)) {
198 set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
199 return;
200 }
201
202 /* no GS: only lc == 0 is valid */
203 if (!s390_has_feat(S390_FEAT_GUARDED_STORAGE) &&
204 lc != 0) {
205 set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
206 return;
207 }
208
209 /* GS: 0, 10, 11, 12 are valid */
210 if (s390_has_feat(S390_FEAT_GUARDED_STORAGE) &&
211 lc != 0 &&
212 lc != 10 &&
213 lc != 11 &&
214 lc != 12) {
215 set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
216 return;
217 }
218
219 cpu_synchronize_state(cs);
220
221 if (s390_store_adtl_status(cpu, addr, len)) {
222 set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
223 return;
224 }
225 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
226 }
227
sigp_restart(CPUState * cs,run_on_cpu_data arg)228 static void sigp_restart(CPUState *cs, run_on_cpu_data arg)
229 {
230 S390CPU *cpu = S390_CPU(cs);
231 SigpInfo *si = arg.host_ptr;
232
233 switch (s390_cpu_get_state(cpu)) {
234 case S390_CPU_STATE_STOPPED:
235 /* the restart irq has to be delivered prior to any other pending irq */
236 cpu_synchronize_state(cs);
237 /*
238 * Set OPERATING (and unhalting) before loading the restart PSW.
239 * s390_cpu_set_psw() will then properly halt the CPU again if
240 * necessary (TCG).
241 */
242 s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
243 do_restart_interrupt(&cpu->env);
244 break;
245 case S390_CPU_STATE_OPERATING:
246 cpu_inject_restart(cpu);
247 break;
248 }
249 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
250 }
251
sigp_initial_cpu_reset(CPUState * cs,run_on_cpu_data arg)252 static void sigp_initial_cpu_reset(CPUState *cs, run_on_cpu_data arg)
253 {
254 SigpInfo *si = arg.host_ptr;
255
256 cpu_synchronize_state(cs);
257 resettable_reset(OBJECT(cs), RESET_TYPE_S390_CPU_INITIAL);
258 cpu_synchronize_post_reset(cs);
259 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
260 }
261
sigp_cpu_reset(CPUState * cs,run_on_cpu_data arg)262 static void sigp_cpu_reset(CPUState *cs, run_on_cpu_data arg)
263 {
264 SigpInfo *si = arg.host_ptr;
265
266 cpu_synchronize_state(cs);
267 resettable_reset(OBJECT(cs), RESET_TYPE_S390_CPU_NORMAL);
268 cpu_synchronize_post_reset(cs);
269 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
270 }
271
sigp_set_prefix(CPUState * cs,run_on_cpu_data arg)272 static void sigp_set_prefix(CPUState *cs, run_on_cpu_data arg)
273 {
274 S390CPU *cpu = S390_CPU(cs);
275 SigpInfo *si = arg.host_ptr;
276 uint32_t addr = si->param & 0x7fffe000u;
277
278 cpu_synchronize_state(cs);
279
280 if (!address_space_access_valid(&address_space_memory, addr,
281 sizeof(struct LowCore), false,
282 MEMTXATTRS_UNSPECIFIED)) {
283 set_sigp_status(si, SIGP_STAT_INVALID_PARAMETER);
284 return;
285 }
286
287 /* cpu has to be stopped */
288 if (s390_cpu_get_state(cpu) != S390_CPU_STATE_STOPPED) {
289 set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
290 return;
291 }
292
293 cpu->env.psa = addr;
294 tlb_flush(cs);
295 cpu_synchronize_post_init(cs);
296 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
297 }
298
sigp_cond_emergency(S390CPU * src_cpu,S390CPU * dst_cpu,SigpInfo * si)299 static void sigp_cond_emergency(S390CPU *src_cpu, S390CPU *dst_cpu,
300 SigpInfo *si)
301 {
302 const uint64_t psw_int_mask = PSW_MASK_IO | PSW_MASK_EXT;
303 uint16_t p_asn, s_asn, asn;
304 uint64_t psw_addr, psw_mask;
305 bool idle;
306
307 if (!tcg_enabled()) {
308 /* handled in KVM */
309 set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
310 return;
311 }
312
313 /* this looks racy, but these values are only used when STOPPED */
314 idle = CPU(dst_cpu)->halted;
315 psw_addr = dst_cpu->env.psw.addr;
316 psw_mask = dst_cpu->env.psw.mask;
317 asn = si->param;
318 p_asn = dst_cpu->env.cregs[4] & 0xffff; /* Primary ASN */
319 s_asn = dst_cpu->env.cregs[3] & 0xffff; /* Secondary ASN */
320
321 if (s390_cpu_get_state(dst_cpu) != S390_CPU_STATE_STOPPED ||
322 (psw_mask & psw_int_mask) != psw_int_mask ||
323 (idle && psw_addr != 0) ||
324 (!idle && (asn == p_asn || asn == s_asn))) {
325 cpu_inject_emergency_signal(dst_cpu, src_cpu->env.core_id);
326 } else {
327 set_sigp_status(si, SIGP_STAT_INCORRECT_STATE);
328 }
329
330 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
331 }
332
sigp_sense_running(S390CPU * dst_cpu,SigpInfo * si)333 static void sigp_sense_running(S390CPU *dst_cpu, SigpInfo *si)
334 {
335 if (!tcg_enabled()) {
336 /* handled in KVM */
337 set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
338 return;
339 }
340
341 /* sensing without locks is racy, but it's the same for real hw */
342 if (!s390_has_feat(S390_FEAT_SENSE_RUNNING_STATUS)) {
343 set_sigp_status(si, SIGP_STAT_INVALID_ORDER);
344 return;
345 }
346
347 /* If halted (which includes also STOPPED), it is not running */
348 if (CPU(dst_cpu)->halted) {
349 set_sigp_status(si, SIGP_STAT_NOT_RUNNING);
350 } else {
351 si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;
352 }
353 }
354
handle_sigp_single_dst(S390CPU * cpu,S390CPU * dst_cpu,uint8_t order,uint64_t param,uint64_t * status_reg)355 static int handle_sigp_single_dst(S390CPU *cpu, S390CPU *dst_cpu, uint8_t order,
356 uint64_t param, uint64_t *status_reg)
357 {
358 SigpInfo si = {
359 .param = param,
360 .status_reg = status_reg,
361 };
362
363 /* cpu available? */
364 if (dst_cpu == NULL) {
365 return SIGP_CC_NOT_OPERATIONAL;
366 }
367
368 /* only resets can break pending orders */
369 if (dst_cpu->env.sigp_order != 0 &&
370 order != SIGP_CPU_RESET &&
371 order != SIGP_INITIAL_CPU_RESET) {
372 return SIGP_CC_BUSY;
373 }
374
375 switch (order) {
376 case SIGP_SENSE:
377 sigp_sense(dst_cpu, &si);
378 break;
379 case SIGP_EXTERNAL_CALL:
380 sigp_external_call(cpu, dst_cpu, &si);
381 break;
382 case SIGP_EMERGENCY:
383 sigp_emergency(cpu, dst_cpu, &si);
384 break;
385 case SIGP_START:
386 run_on_cpu(CPU(dst_cpu), sigp_start, RUN_ON_CPU_HOST_PTR(&si));
387 break;
388 case SIGP_STOP:
389 run_on_cpu(CPU(dst_cpu), sigp_stop, RUN_ON_CPU_HOST_PTR(&si));
390 break;
391 case SIGP_RESTART:
392 run_on_cpu(CPU(dst_cpu), sigp_restart, RUN_ON_CPU_HOST_PTR(&si));
393 break;
394 case SIGP_STOP_STORE_STATUS:
395 run_on_cpu(CPU(dst_cpu), sigp_stop_and_store_status, RUN_ON_CPU_HOST_PTR(&si));
396 break;
397 case SIGP_STORE_STATUS_ADDR:
398 run_on_cpu(CPU(dst_cpu), sigp_store_status_at_address, RUN_ON_CPU_HOST_PTR(&si));
399 break;
400 case SIGP_STORE_ADTL_STATUS:
401 run_on_cpu(CPU(dst_cpu), sigp_store_adtl_status, RUN_ON_CPU_HOST_PTR(&si));
402 break;
403 case SIGP_SET_PREFIX:
404 run_on_cpu(CPU(dst_cpu), sigp_set_prefix, RUN_ON_CPU_HOST_PTR(&si));
405 break;
406 case SIGP_INITIAL_CPU_RESET:
407 run_on_cpu(CPU(dst_cpu), sigp_initial_cpu_reset, RUN_ON_CPU_HOST_PTR(&si));
408 break;
409 case SIGP_CPU_RESET:
410 run_on_cpu(CPU(dst_cpu), sigp_cpu_reset, RUN_ON_CPU_HOST_PTR(&si));
411 break;
412 case SIGP_COND_EMERGENCY:
413 sigp_cond_emergency(cpu, dst_cpu, &si);
414 break;
415 case SIGP_SENSE_RUNNING:
416 sigp_sense_running(dst_cpu, &si);
417 break;
418 default:
419 set_sigp_status(&si, SIGP_STAT_INVALID_ORDER);
420 }
421
422 return si.cc;
423 }
424
sigp_set_architecture(S390CPU * cpu,uint32_t param,uint64_t * status_reg)425 static int sigp_set_architecture(S390CPU *cpu, uint32_t param,
426 uint64_t *status_reg)
427 {
428 *status_reg &= 0xffffffff00000000ULL;
429
430 /* Reject set arch order, with czam we're always in z/Arch mode. */
431 *status_reg |= SIGP_STAT_INVALID_PARAMETER;
432 return SIGP_CC_STATUS_STORED;
433 }
434
s390_cpu_addr2state(uint16_t cpu_addr)435 S390CPU *s390_cpu_addr2state(uint16_t cpu_addr)
436 {
437 static MachineState *ms;
438
439 if (!ms) {
440 ms = MACHINE(qdev_get_machine());
441 g_assert(ms->possible_cpus);
442 }
443
444 /* CPU address corresponds to the core_id and the index */
445 if (cpu_addr >= ms->possible_cpus->len) {
446 return NULL;
447 }
448 return S390_CPU(ms->possible_cpus->cpus[cpu_addr].cpu);
449 }
450
handle_sigp(CPUS390XState * env,uint8_t order,uint64_t r1,uint64_t r3)451 int handle_sigp(CPUS390XState *env, uint8_t order, uint64_t r1, uint64_t r3)
452 {
453 uint64_t *status_reg = &env->regs[r1];
454 uint64_t param = (r1 % 2) ? env->regs[r1] : env->regs[r1 + 1];
455 S390CPU *cpu = env_archcpu(env);
456 S390CPU *dst_cpu = NULL;
457 int ret;
458
459 if (qemu_mutex_trylock(&qemu_sigp_mutex)) {
460 ret = SIGP_CC_BUSY;
461 goto out;
462 }
463
464 switch (order) {
465 case SIGP_SET_ARCH:
466 ret = sigp_set_architecture(cpu, param, status_reg);
467 break;
468 default:
469 /* all other sigp orders target a single vcpu */
470 dst_cpu = s390_cpu_addr2state(env->regs[r3]);
471 ret = handle_sigp_single_dst(cpu, dst_cpu, order, param, status_reg);
472 }
473 qemu_mutex_unlock(&qemu_sigp_mutex);
474
475 out:
476 trace_sigp_finished(order, CPU(cpu)->cpu_index,
477 dst_cpu ? CPU(dst_cpu)->cpu_index : -1, ret);
478 g_assert(ret >= 0);
479
480 return ret;
481 }
482
s390_cpu_restart(S390CPU * cpu)483 int s390_cpu_restart(S390CPU *cpu)
484 {
485 SigpInfo si = {};
486
487 run_on_cpu(CPU(cpu), sigp_restart, RUN_ON_CPU_HOST_PTR(&si));
488 return 0;
489 }
490
do_stop_interrupt(CPUS390XState * env)491 void do_stop_interrupt(CPUS390XState *env)
492 {
493 S390CPU *cpu = env_archcpu(env);
494
495 /*
496 * Complete the STOP operation before exposing the CPU as
497 * STOPPED to the system.
498 */
499 if (cpu->env.sigp_order == SIGP_STOP_STORE_STATUS) {
500 s390_store_status(cpu, S390_STORE_STATUS_DEF_ADDR, true);
501 }
502 env->sigp_order = 0;
503 if (s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu) == 0) {
504 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
505 }
506 env->pending_int &= ~INTERRUPT_STOP;
507 }
508
s390_init_sigp(void)509 void s390_init_sigp(void)
510 {
511 qemu_mutex_init(&qemu_sigp_mutex);
512 }
513