s390x/tcg: fix CPU hotplug with single-threaded TCG
[qemu.git] / target / s390x / cpu.c
1 /*
2 * QEMU S/390 CPU
3 *
4 * Copyright (c) 2009 Ulrich Hecht
5 * Copyright (c) 2011 Alexander Graf
6 * Copyright (c) 2012 SUSE LINUX Products GmbH
7 * Copyright (c) 2012 IBM Corp.
8 *
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, see
21 * <http://www.gnu.org/licenses/lgpl-2.1.html>
22 * Contributions after 2012-12-11 are licensed under the terms of the
23 * GNU GPL, version 2 or (at your option) any later version.
24 */
25
26 #include "qemu/osdep.h"
27 #include "qapi/error.h"
28 #include "cpu.h"
29 #include "internal.h"
30 #include "kvm_s390x.h"
31 #include "sysemu/kvm.h"
32 #include "qemu-common.h"
33 #include "qemu/timer.h"
34 #include "qemu/error-report.h"
35 #include "trace.h"
36 #include "qapi/visitor.h"
37 #include "qapi/qapi-visit-misc.h"
38 #include "qapi/qapi-visit-run-state.h"
39 #include "sysemu/hw_accel.h"
40 #include "hw/qdev-properties.h"
41 #ifndef CONFIG_USER_ONLY
42 #include "hw/hw.h"
43 #include "sysemu/arch_init.h"
44 #include "sysemu/sysemu.h"
45 #endif
46 #include "fpu/softfloat.h"
47
48 #define CR0_RESET 0xE0UL
49 #define CR14_RESET 0xC2000000UL;
50
51 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
52 {
53 S390CPU *cpu = S390_CPU(cs);
54
55 cpu->env.psw.addr = value;
56 }
57
58 static bool s390_cpu_has_work(CPUState *cs)
59 {
60 S390CPU *cpu = S390_CPU(cs);
61
62 /* STOPPED cpus can never wake up */
63 if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
64 s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
65 return false;
66 }
67
68 if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
69 return false;
70 }
71
72 return s390_cpu_has_int(cpu);
73 }
74
75 #if !defined(CONFIG_USER_ONLY)
76 /* S390CPUClass::load_normal() */
77 static void s390_cpu_load_normal(CPUState *s)
78 {
79 S390CPU *cpu = S390_CPU(s);
80 cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
81 cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
82 s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
83 }
84 #endif
85
86 /* S390CPUClass::cpu_reset() */
87 static void s390_cpu_reset(CPUState *s)
88 {
89 S390CPU *cpu = S390_CPU(s);
90 S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
91 CPUS390XState *env = &cpu->env;
92
93 env->pfault_token = -1UL;
94 env->bpbc = false;
95 scc->parent_reset(s);
96 cpu->env.sigp_order = 0;
97 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
98 }
99
100 /* S390CPUClass::initial_reset() */
101 static void s390_cpu_initial_reset(CPUState *s)
102 {
103 S390CPU *cpu = S390_CPU(s);
104 CPUS390XState *env = &cpu->env;
105
106 s390_cpu_reset(s);
107 /* initial reset does not clear everything! */
108 memset(&env->start_initial_reset_fields, 0,
109 offsetof(CPUS390XState, end_reset_fields) -
110 offsetof(CPUS390XState, start_initial_reset_fields));
111
112 /* architectured initial values for CR 0 and 14 */
113 env->cregs[0] = CR0_RESET;
114 env->cregs[14] = CR14_RESET;
115
116 /* architectured initial value for Breaking-Event-Address register */
117 env->gbea = 1;
118
119 env->pfault_token = -1UL;
120
121 /* tininess for underflow is detected before rounding */
122 set_float_detect_tininess(float_tininess_before_rounding,
123 &env->fpu_status);
124
125 /* Reset state inside the kernel that we cannot access yet from QEMU. */
126 if (kvm_enabled()) {
127 kvm_s390_reset_vcpu(cpu);
128 }
129 }
130
131 /* CPUClass:reset() */
132 static void s390_cpu_full_reset(CPUState *s)
133 {
134 S390CPU *cpu = S390_CPU(s);
135 S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
136 CPUS390XState *env = &cpu->env;
137
138 scc->parent_reset(s);
139 cpu->env.sigp_order = 0;
140 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
141
142 memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
143
144 /* architectured initial values for CR 0 and 14 */
145 env->cregs[0] = CR0_RESET;
146 env->cregs[14] = CR14_RESET;
147
148 /* architectured initial value for Breaking-Event-Address register */
149 env->gbea = 1;
150
151 env->pfault_token = -1UL;
152
153 /* tininess for underflow is detected before rounding */
154 set_float_detect_tininess(float_tininess_before_rounding,
155 &env->fpu_status);
156
157 /* Reset state inside the kernel that we cannot access yet from QEMU. */
158 if (kvm_enabled()) {
159 kvm_s390_reset_vcpu(cpu);
160 }
161 }
162
163 #if !defined(CONFIG_USER_ONLY)
164 static void s390_cpu_machine_reset_cb(void *opaque)
165 {
166 S390CPU *cpu = opaque;
167
168 run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
169 }
170 #endif
171
172 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
173 {
174 info->mach = bfd_mach_s390_64;
175 info->print_insn = print_insn_s390;
176 }
177
178 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
179 {
180 CPUState *cs = CPU(dev);
181 S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
182 #if !defined(CONFIG_USER_ONLY)
183 S390CPU *cpu = S390_CPU(dev);
184 #endif
185 Error *err = NULL;
186
187 /* the model has to be realized before qemu_init_vcpu() due to kvm */
188 s390_realize_cpu_model(cs, &err);
189 if (err) {
190 goto out;
191 }
192
193 #if !defined(CONFIG_USER_ONLY)
194 if (cpu->env.core_id >= max_cpus) {
195 error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
196 ", maximum core-id: %d", cpu->env.core_id,
197 max_cpus - 1);
198 goto out;
199 }
200
201 if (cpu_exists(cpu->env.core_id)) {
202 error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
203 ", it already exists", cpu->env.core_id);
204 goto out;
205 }
206
207 /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
208 cs->cpu_index = cpu->env.core_id;
209 #endif
210
211 cpu_exec_realizefn(cs, &err);
212 if (err != NULL) {
213 goto out;
214 }
215
216 #if !defined(CONFIG_USER_ONLY)
217 qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
218 #endif
219 s390_cpu_gdb_init(cs);
220 qemu_init_vcpu(cs);
221
222 /*
223 * KVM requires the initial CPU reset ioctl to be executed on the target
224 * CPU thread. CPU hotplug under single-threaded TCG will not work with
225 * run_on_cpu(), as run_on_cpu() will not work properly if called while
226 * the main thread is already running but the CPU hasn't been realized.
227 */
228 if (kvm_enabled()) {
229 run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
230 } else {
231 cpu_reset(cs);
232 }
233
234 scc->parent_realize(dev, &err);
235 out:
236 error_propagate(errp, err);
237 }
238
239 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
240 {
241 GuestPanicInformation *panic_info;
242 S390CPU *cpu = S390_CPU(cs);
243
244 cpu_synchronize_state(cs);
245 panic_info = g_malloc0(sizeof(GuestPanicInformation));
246
247 panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
248 #if !defined(CONFIG_USER_ONLY)
249 panic_info->u.s390.core = cpu->env.core_id;
250 #else
251 panic_info->u.s390.core = 0; /* sane default for non system emulation */
252 #endif
253 panic_info->u.s390.psw_mask = cpu->env.psw.mask;
254 panic_info->u.s390.psw_addr = cpu->env.psw.addr;
255 panic_info->u.s390.reason = cpu->env.crash_reason;
256
257 return panic_info;
258 }
259
260 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
261 const char *name, void *opaque,
262 Error **errp)
263 {
264 CPUState *cs = CPU(obj);
265 GuestPanicInformation *panic_info;
266
267 if (!cs->crash_occurred) {
268 error_setg(errp, "No crash occurred");
269 return;
270 }
271
272 panic_info = s390_cpu_get_crash_info(cs);
273
274 visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
275 errp);
276 qapi_free_GuestPanicInformation(panic_info);
277 }
278
279 static void s390_cpu_initfn(Object *obj)
280 {
281 CPUState *cs = CPU(obj);
282 S390CPU *cpu = S390_CPU(obj);
283 CPUS390XState *env = &cpu->env;
284
285 cs->env_ptr = env;
286 cs->halted = 1;
287 cs->exception_index = EXCP_HLT;
288 object_property_add(obj, "crash-information", "GuestPanicInformation",
289 s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
290 s390_cpu_model_register_props(obj);
291 #if !defined(CONFIG_USER_ONLY)
292 env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
293 env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
294 s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
295 #endif
296 }
297
298 static void s390_cpu_finalize(Object *obj)
299 {
300 #if !defined(CONFIG_USER_ONLY)
301 S390CPU *cpu = S390_CPU(obj);
302
303 qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
304 g_free(cpu->irqstate);
305 #endif
306 }
307
308 #if !defined(CONFIG_USER_ONLY)
309 static bool disabled_wait(CPUState *cpu)
310 {
311 return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
312 (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
313 }
314
315 static unsigned s390_count_running_cpus(void)
316 {
317 CPUState *cpu;
318 int nr_running = 0;
319
320 CPU_FOREACH(cpu) {
321 uint8_t state = S390_CPU(cpu)->env.cpu_state;
322 if (state == S390_CPU_STATE_OPERATING ||
323 state == S390_CPU_STATE_LOAD) {
324 if (!disabled_wait(cpu)) {
325 nr_running++;
326 }
327 }
328 }
329
330 return nr_running;
331 }
332
333 unsigned int s390_cpu_halt(S390CPU *cpu)
334 {
335 CPUState *cs = CPU(cpu);
336 trace_cpu_halt(cs->cpu_index);
337
338 if (!cs->halted) {
339 cs->halted = 1;
340 cs->exception_index = EXCP_HLT;
341 }
342
343 return s390_count_running_cpus();
344 }
345
346 void s390_cpu_unhalt(S390CPU *cpu)
347 {
348 CPUState *cs = CPU(cpu);
349 trace_cpu_unhalt(cs->cpu_index);
350
351 if (cs->halted) {
352 cs->halted = 0;
353 cs->exception_index = -1;
354 }
355 }
356
357 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
358 {
359 trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
360
361 switch (cpu_state) {
362 case S390_CPU_STATE_STOPPED:
363 case S390_CPU_STATE_CHECK_STOP:
364 /* halt the cpu for common infrastructure */
365 s390_cpu_halt(cpu);
366 break;
367 case S390_CPU_STATE_OPERATING:
368 case S390_CPU_STATE_LOAD:
369 /*
370 * Starting a CPU with a PSW WAIT bit set:
371 * KVM: handles this internally and triggers another WAIT exit.
372 * TCG: will actually try to continue to run. Don't unhalt, will
373 * be done when the CPU actually has work (an interrupt).
374 */
375 if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
376 s390_cpu_unhalt(cpu);
377 }
378 break;
379 default:
380 error_report("Requested CPU state is not a valid S390 CPU state: %u",
381 cpu_state);
382 exit(1);
383 }
384 if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
385 kvm_s390_set_cpu_state(cpu, cpu_state);
386 }
387 cpu->env.cpu_state = cpu_state;
388
389 return s390_count_running_cpus();
390 }
391
392 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
393 {
394 if (kvm_enabled()) {
395 return kvm_s390_set_mem_limit(new_limit, hw_limit);
396 }
397 return 0;
398 }
399
400 void s390_cmma_reset(void)
401 {
402 if (kvm_enabled()) {
403 kvm_s390_cmma_reset();
404 }
405 }
406
407 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
408 int vq, bool assign)
409 {
410 if (kvm_enabled()) {
411 return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
412 } else {
413 return 0;
414 }
415 }
416
417 void s390_crypto_reset(void)
418 {
419 if (kvm_enabled()) {
420 kvm_s390_crypto_reset();
421 }
422 }
423
424 bool s390_get_squash_mcss(void)
425 {
426 if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
427 NULL)) {
428 return true;
429 }
430
431 return false;
432 }
433
434 void s390_enable_css_support(S390CPU *cpu)
435 {
436 if (kvm_enabled()) {
437 kvm_s390_enable_css_support(cpu);
438 }
439 }
440 #endif
441
442 static gchar *s390_gdb_arch_name(CPUState *cs)
443 {
444 return g_strdup("s390:64-bit");
445 }
446
447 static Property s390x_cpu_properties[] = {
448 #if !defined(CONFIG_USER_ONLY)
449 DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
450 #endif
451 DEFINE_PROP_END_OF_LIST()
452 };
453
454 static void s390_cpu_class_init(ObjectClass *oc, void *data)
455 {
456 S390CPUClass *scc = S390_CPU_CLASS(oc);
457 CPUClass *cc = CPU_CLASS(scc);
458 DeviceClass *dc = DEVICE_CLASS(oc);
459
460 device_class_set_parent_realize(dc, s390_cpu_realizefn,
461 &scc->parent_realize);
462 dc->props = s390x_cpu_properties;
463 dc->user_creatable = true;
464
465 scc->parent_reset = cc->reset;
466 #if !defined(CONFIG_USER_ONLY)
467 scc->load_normal = s390_cpu_load_normal;
468 #endif
469 scc->cpu_reset = s390_cpu_reset;
470 scc->initial_cpu_reset = s390_cpu_initial_reset;
471 cc->reset = s390_cpu_full_reset;
472 cc->class_by_name = s390_cpu_class_by_name,
473 cc->has_work = s390_cpu_has_work;
474 #ifdef CONFIG_TCG
475 cc->do_interrupt = s390_cpu_do_interrupt;
476 #endif
477 cc->dump_state = s390_cpu_dump_state;
478 cc->get_crash_info = s390_cpu_get_crash_info;
479 cc->set_pc = s390_cpu_set_pc;
480 cc->gdb_read_register = s390_cpu_gdb_read_register;
481 cc->gdb_write_register = s390_cpu_gdb_write_register;
482 #ifdef CONFIG_USER_ONLY
483 cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
484 #else
485 cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
486 cc->vmsd = &vmstate_s390_cpu;
487 cc->write_elf64_note = s390_cpu_write_elf64_note;
488 #ifdef CONFIG_TCG
489 cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
490 cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
491 cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
492 #endif
493 #endif
494 cc->disas_set_info = s390_cpu_disas_set_info;
495 #ifdef CONFIG_TCG
496 cc->tcg_initialize = s390x_translate_init;
497 #endif
498
499 cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
500 cc->gdb_core_xml_file = "s390x-core64.xml";
501 cc->gdb_arch_name = s390_gdb_arch_name;
502
503 s390_cpu_model_class_register_props(oc);
504 }
505
506 static const TypeInfo s390_cpu_type_info = {
507 .name = TYPE_S390_CPU,
508 .parent = TYPE_CPU,
509 .instance_size = sizeof(S390CPU),
510 .instance_init = s390_cpu_initfn,
511 .instance_finalize = s390_cpu_finalize,
512 .abstract = true,
513 .class_size = sizeof(S390CPUClass),
514 .class_init = s390_cpu_class_init,
515 };
516
517 static void s390_cpu_register_types(void)
518 {
519 type_register_static(&s390_cpu_type_info);
520 }
521
522 type_init(s390_cpu_register_types)