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 "qemu-common.h"
  31 #include "qemu/cutils.h"
  32 #include "qemu/timer.h"
  33 #include "qemu/error-report.h"
  34 #include "trace.h"
  35 #include "qapi/visitor.h"
  36 #include "exec/exec-all.h"
  37 #ifndef CONFIG_USER_ONLY
  38 #include "hw/hw.h"
  39 #include "sysemu/arch_init.h"
  40 #include "sysemu/sysemu.h"
  41 #include "hw/s390x/sclp.h"
  42 #endif
  43
  44 #define CR0_RESET       0xE0UL
  45 #define CR14_RESET      0xC2000000UL;
  46
  47 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  48 {
  49     S390CPU *cpu = S390_CPU(cs);
  50
  51     cpu->env.psw.addr = value;
  52 }
  53
  54 static bool s390_cpu_has_work(CPUState *cs)
  55 {
  56     S390CPU *cpu = S390_CPU(cs);
  57     CPUS390XState *env = &cpu->env;
  58
  59     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  60            (env->psw.mask & PSW_MASK_EXT);
  61 }
  62
  63 #if !defined(CONFIG_USER_ONLY)
  64 /* S390CPUClass::load_normal() */
  65 static void s390_cpu_load_normal(CPUState *s)
  66 {
  67     S390CPU *cpu = S390_CPU(s);
  68     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  69     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  70     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  71 }
  72 #endif
  73
  74 /* S390CPUClass::cpu_reset() */
  75 static void s390_cpu_reset(CPUState *s)
  76 {
  77     S390CPU *cpu = S390_CPU(s);
  78     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  79     CPUS390XState *env = &cpu->env;
  80
  81     env->pfault_token = -1UL;
  82     scc->parent_reset(s);
  83     cpu->env.sigp_order = 0;
  84     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
  85 }
  86
  87 /* S390CPUClass::initial_reset() */
  88 static void s390_cpu_initial_reset(CPUState *s)
  89 {
  90     S390CPU *cpu = S390_CPU(s);
  91     CPUS390XState *env = &cpu->env;
  92     int i;
  93
  94     s390_cpu_reset(s);
  95     /* initial reset does not clear everything! */
  96     memset(&env->start_initial_reset_fields, 0,
  97         offsetof(CPUS390XState, end_reset_fields) -
  98         offsetof(CPUS390XState, start_initial_reset_fields));
  99
 100     /* architectured initial values for CR 0 and 14 */
 101     env->cregs[0] = CR0_RESET;
 102     env->cregs[14] = CR14_RESET;
 103
 104     /* architectured initial value for Breaking-Event-Address register */
 105     env->gbea = 1;
 106
 107     env->pfault_token = -1UL;
 108     env->ext_index = -1;
 109     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 110         env->io_index[i] = -1;
 111     }
 112
 113     /* tininess for underflow is detected before rounding */
 114     set_float_detect_tininess(float_tininess_before_rounding,
 115                               &env->fpu_status);
 116
 117     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 118     if (kvm_enabled()) {
 119         kvm_s390_reset_vcpu(cpu);
 120     }
 121 }
 122
 123 /* CPUClass:reset() */
 124 static void s390_cpu_full_reset(CPUState *s)
 125 {
 126     S390CPU *cpu = S390_CPU(s);
 127     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 128     CPUS390XState *env = &cpu->env;
 129     int i;
 130
 131     scc->parent_reset(s);
 132     cpu->env.sigp_order = 0;
 133     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 134
 135     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 136
 137     /* architectured initial values for CR 0 and 14 */
 138     env->cregs[0] = CR0_RESET;
 139     env->cregs[14] = CR14_RESET;
 140
 141     /* architectured initial value for Breaking-Event-Address register */
 142     env->gbea = 1;
 143
 144     env->pfault_token = -1UL;
 145     env->ext_index = -1;
 146     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 147         env->io_index[i] = -1;
 148     }
 149
 150     /* tininess for underflow is detected before rounding */
 151     set_float_detect_tininess(float_tininess_before_rounding,
 152                               &env->fpu_status);
 153
 154     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 155     if (kvm_enabled()) {
 156         kvm_s390_reset_vcpu(cpu);
 157     }
 158 }
 159
 160 #if !defined(CONFIG_USER_ONLY)
 161 static void s390_cpu_machine_reset_cb(void *opaque)
 162 {
 163     S390CPU *cpu = opaque;
 164
 165     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 166 }
 167 #endif
 168
 169 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 170 {
 171     info->mach = bfd_mach_s390_64;
 172     info->print_insn = print_insn_s390;
 173 }
 174
 175 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 176 {
 177     CPUState *cs = CPU(dev);
 178     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 179     S390CPU *cpu = S390_CPU(dev);
 180     CPUS390XState *env = &cpu->env;
 181     Error *err = NULL;
 182
 183     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 184     s390_realize_cpu_model(cs, &err);
 185     if (err) {
 186         goto out;
 187     }
 188
 189 #if !defined(CONFIG_USER_ONLY)
 190     if (cpu->id >= max_cpus) {
 191         error_setg(&err, "Unable to add CPU: %" PRIi64
 192                    ", max allowed: %d", cpu->id, max_cpus - 1);
 193         goto out;
 194     }
 195 #endif
 196     if (cpu_exists(cpu->id)) {
 197         error_setg(&err, "Unable to add CPU: %" PRIi64
 198                    ", it already exists", cpu->id);
 199         goto out;
 200     }
 201     if (cpu->id != scc->next_cpu_id) {
 202         error_setg(&err, "Unable to add CPU: %" PRIi64
 203                    ", The next available id is %" PRIi64, cpu->id,
 204                    scc->next_cpu_id);
 205         goto out;
 206     }
 207
 208     cpu_exec_realizefn(cs, &err);
 209     if (err != NULL) {
 210         goto out;
 211     }
 212     scc->next_cpu_id++;
 213
 214 #if !defined(CONFIG_USER_ONLY)
 215     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 216 #endif
 217     env->cpu_num = cpu->id;
 218     s390_cpu_gdb_init(cs);
 219     qemu_init_vcpu(cs);
 220 #if !defined(CONFIG_USER_ONLY)
 221     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 222 #else
 223     cpu_reset(cs);
 224 #endif
 225
 226     scc->parent_realize(dev, &err);
 227
 228 #if !defined(CONFIG_USER_ONLY)
 229     if (dev->hotplugged) {
 230         raise_irq_cpu_hotplug();
 231     }
 232 #endif
 233
 234 out:
 235     error_propagate(errp, err);
 236 }
 237
 238 static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
 239                              void *opaque, Error **errp)
 240 {
 241     S390CPU *cpu = S390_CPU(obj);
 242     int64_t value = cpu->id;
 243
 244     visit_type_int(v, name, &value, errp);
 245 }
 246
 247 static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
 248                              void *opaque, Error **errp)
 249 {
 250     S390CPU *cpu = S390_CPU(obj);
 251     DeviceState *dev = DEVICE(obj);
 252     const int64_t min = 0;
 253     const int64_t max = UINT32_MAX;
 254     Error *err = NULL;
 255     int64_t value;
 256
 257     if (dev->realized) {
 258         error_setg(errp, "Attempt to set property '%s' on '%s' after "
 259                    "it was realized", name, object_get_typename(obj));
 260         return;
 261     }
 262
 263     visit_type_int(v, name, &value, &err);
 264     if (err) {
 265         error_propagate(errp, err);
 266         return;
 267     }
 268     if (value < min || value > max) {
 269         error_setg(errp, "Property %s.%s doesn't take value %" PRId64
 270                    " (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
 271                    object_get_typename(obj), name, value, min, max);
 272         return;
 273     }
 274     cpu->id = value;
 275 }
 276
 277 static void s390_cpu_initfn(Object *obj)
 278 {
 279     CPUState *cs = CPU(obj);
 280     S390CPU *cpu = S390_CPU(obj);
 281     CPUS390XState *env = &cpu->env;
 282     static bool inited;
 283 #if !defined(CONFIG_USER_ONLY)
 284     struct tm tm;
 285 #endif
 286
 287     cs->env_ptr = env;
 288     cs->halted = 1;
 289     cs->exception_index = EXCP_HLT;
 290     object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
 291                         s390x_cpu_set_id, NULL, NULL, NULL);
 292     s390_cpu_model_register_props(obj);
 293 #if !defined(CONFIG_USER_ONLY)
 294     qemu_get_timedate(&tm, 0);
 295     env->tod_offset = TOD_UNIX_EPOCH +
 296                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 297     env->tod_basetime = 0;
 298     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 299     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 300     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 301 #endif
 302
 303     if (tcg_enabled() && !inited) {
 304         inited = true;
 305         s390x_translate_init();
 306     }
 307 }
 308
 309 static void s390_cpu_finalize(Object *obj)
 310 {
 311 #if !defined(CONFIG_USER_ONLY)
 312     S390CPU *cpu = S390_CPU(obj);
 313
 314     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 315     g_free(cpu->irqstate);
 316 #endif
 317 }
 318
 319 #if !defined(CONFIG_USER_ONLY)
 320 static bool disabled_wait(CPUState *cpu)
 321 {
 322     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 323                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 324 }
 325
 326 static unsigned s390_count_running_cpus(void)
 327 {
 328     CPUState *cpu;
 329     int nr_running = 0;
 330
 331     CPU_FOREACH(cpu) {
 332         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 333         if (state == CPU_STATE_OPERATING ||
 334             state == CPU_STATE_LOAD) {
 335             if (!disabled_wait(cpu)) {
 336                 nr_running++;
 337             }
 338         }
 339     }
 340
 341     return nr_running;
 342 }
 343
 344 unsigned int s390_cpu_halt(S390CPU *cpu)
 345 {
 346     CPUState *cs = CPU(cpu);
 347     trace_cpu_halt(cs->cpu_index);
 348
 349     if (!cs->halted) {
 350         cs->halted = 1;
 351         cs->exception_index = EXCP_HLT;
 352     }
 353
 354     return s390_count_running_cpus();
 355 }
 356
 357 void s390_cpu_unhalt(S390CPU *cpu)
 358 {
 359     CPUState *cs = CPU(cpu);
 360     trace_cpu_unhalt(cs->cpu_index);
 361
 362     if (cs->halted) {
 363         cs->halted = 0;
 364         cs->exception_index = -1;
 365     }
 366 }
 367
 368 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 369  {
 370     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 371
 372     switch (cpu_state) {
 373     case CPU_STATE_STOPPED:
 374     case CPU_STATE_CHECK_STOP:
 375         /* halt the cpu for common infrastructure */
 376         s390_cpu_halt(cpu);
 377         break;
 378     case CPU_STATE_OPERATING:
 379     case CPU_STATE_LOAD:
 380         /* unhalt the cpu for common infrastructure */
 381         s390_cpu_unhalt(cpu);
 382         break;
 383     default:
 384         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 385                      cpu_state);
 386         exit(1);
 387     }
 388     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 389         kvm_s390_set_cpu_state(cpu, cpu_state);
 390     }
 391     cpu->env.cpu_state = cpu_state;
 392
 393     return s390_count_running_cpus();
 394 }
 395
 396 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 397 {
 398     if (kvm_enabled()) {
 399         return kvm_s390_get_clock(tod_high, tod_low);
 400     }
 401     /* Fixme TCG */
 402     *tod_high = 0;
 403     *tod_low = 0;
 404     return 0;
 405 }
 406
 407 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 408 {
 409     if (kvm_enabled()) {
 410         return kvm_s390_set_clock(tod_high, tod_low);
 411     }
 412     /* Fixme TCG */
 413     return 0;
 414 }
 415
 416 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 417 {
 418     if (kvm_enabled()) {
 419         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 420     }
 421     return 0;
 422 }
 423
 424 void s390_cmma_reset(void)
 425 {
 426     if (kvm_enabled()) {
 427         kvm_s390_cmma_reset();
 428     }
 429 }
 430
 431 int s390_cpu_restart(S390CPU *cpu)
 432 {
 433     if (kvm_enabled()) {
 434         return kvm_s390_cpu_restart(cpu);
 435     }
 436     return -ENOSYS;
 437 }
 438
 439 int s390_get_memslot_count(void)
 440 {
 441     if (kvm_enabled()) {
 442         return kvm_s390_get_memslot_count();
 443     } else {
 444         return MAX_AVAIL_SLOTS;
 445     }
 446 }
 447
 448 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 449                                 int vq, bool assign)
 450 {
 451     if (kvm_enabled()) {
 452         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 453     } else {
 454         return 0;
 455     }
 456 }
 457
 458 void s390_crypto_reset(void)
 459 {
 460     if (kvm_enabled()) {
 461         kvm_s390_crypto_reset();
 462     }
 463 }
 464
 465 bool s390_get_squash_mcss(void)
 466 {
 467     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 468                                  NULL)) {
 469         return true;
 470     }
 471
 472     return false;
 473 }
 474
 475 void s390_enable_css_support(S390CPU *cpu)
 476 {
 477     if (kvm_enabled()) {
 478         kvm_s390_enable_css_support(cpu);
 479     }
 480 }
 481 #endif
 482
 483 static gchar *s390_gdb_arch_name(CPUState *cs)
 484 {
 485     return g_strdup("s390:64-bit");
 486 }
 487
 488 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 489 {
 490     S390CPUClass *scc = S390_CPU_CLASS(oc);
 491     CPUClass *cc = CPU_CLASS(scc);
 492     DeviceClass *dc = DEVICE_CLASS(oc);
 493
 494     scc->next_cpu_id = 0;
 495     scc->parent_realize = dc->realize;
 496     dc->realize = s390_cpu_realizefn;
 497
 498     scc->parent_reset = cc->reset;
 499 #if !defined(CONFIG_USER_ONLY)
 500     scc->load_normal = s390_cpu_load_normal;
 501 #endif
 502     scc->cpu_reset = s390_cpu_reset;
 503     scc->initial_cpu_reset = s390_cpu_initial_reset;
 504     cc->reset = s390_cpu_full_reset;
 505     cc->class_by_name = s390_cpu_class_by_name,
 506     cc->has_work = s390_cpu_has_work;
 507 #ifdef CONFIG_TCG
 508     cc->do_interrupt = s390_cpu_do_interrupt;
 509 #endif
 510     cc->dump_state = s390_cpu_dump_state;
 511     cc->set_pc = s390_cpu_set_pc;
 512     cc->gdb_read_register = s390_cpu_gdb_read_register;
 513     cc->gdb_write_register = s390_cpu_gdb_write_register;
 514 #ifdef CONFIG_USER_ONLY
 515     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 516 #else
 517     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 518     cc->vmsd = &vmstate_s390_cpu;
 519     cc->write_elf64_note = s390_cpu_write_elf64_note;
 520 #ifdef CONFIG_TCG
 521     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 522     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 523     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 524 #endif
 525 #endif
 526     cc->disas_set_info = s390_cpu_disas_set_info;
 527
 528     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 529     cc->gdb_core_xml_file = "s390x-core64.xml";
 530     cc->gdb_arch_name = s390_gdb_arch_name;
 531
 532     s390_cpu_model_class_register_props(oc);
 533 }
 534
 535 static const TypeInfo s390_cpu_type_info = {
 536     .name = TYPE_S390_CPU,
 537     .parent = TYPE_CPU,
 538     .instance_size = sizeof(S390CPU),
 539     .instance_init = s390_cpu_initfn,
 540     .instance_finalize = s390_cpu_finalize,
 541     .abstract = true,
 542     .class_size = sizeof(S390CPUClass),
 543     .class_init = s390_cpu_class_init,
 544 };
 545
 546 static void s390_cpu_register_types(void)
 547 {
 548     type_register_static(&s390_cpu_type_info);
 549 }
 550
 551 type_init(s390_cpu_register_types)