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/cutils.h"
  34 #include "qemu/timer.h"
  35 #include "qemu/error-report.h"
  36 #include "trace.h"
  37 #include "qapi/visitor.h"
  38 #include "exec/exec-all.h"
  39 #ifndef CONFIG_USER_ONLY
  40 #include "hw/hw.h"
  41 #include "sysemu/arch_init.h"
  42 #include "sysemu/sysemu.h"
  43 #include "hw/s390x/sclp.h"
  44 #endif
  45
  46 #define CR0_RESET       0xE0UL
  47 #define CR14_RESET      0xC2000000UL;
  48
  49 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  50 {
  51     S390CPU *cpu = S390_CPU(cs);
  52
  53     cpu->env.psw.addr = value;
  54 }
  55
  56 static bool s390_cpu_has_work(CPUState *cs)
  57 {
  58     S390CPU *cpu = S390_CPU(cs);
  59     CPUS390XState *env = &cpu->env;
  60
  61     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  62            (env->psw.mask & PSW_MASK_EXT);
  63 }
  64
  65 #if !defined(CONFIG_USER_ONLY)
  66 /* S390CPUClass::load_normal() */
  67 static void s390_cpu_load_normal(CPUState *s)
  68 {
  69     S390CPU *cpu = S390_CPU(s);
  70     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  71     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  72     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  73 }
  74 #endif
  75
  76 /* S390CPUClass::cpu_reset() */
  77 static void s390_cpu_reset(CPUState *s)
  78 {
  79     S390CPU *cpu = S390_CPU(s);
  80     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  81     CPUS390XState *env = &cpu->env;
  82
  83     env->pfault_token = -1UL;
  84     scc->parent_reset(s);
  85     cpu->env.sigp_order = 0;
  86     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
  87 }
  88
  89 /* S390CPUClass::initial_reset() */
  90 static void s390_cpu_initial_reset(CPUState *s)
  91 {
  92     S390CPU *cpu = S390_CPU(s);
  93     CPUS390XState *env = &cpu->env;
  94     int i;
  95
  96     s390_cpu_reset(s);
  97     /* initial reset does not clear everything! */
  98     memset(&env->start_initial_reset_fields, 0,
  99         offsetof(CPUS390XState, end_reset_fields) -
 100         offsetof(CPUS390XState, start_initial_reset_fields));
 101
 102     /* architectured initial values for CR 0 and 14 */
 103     env->cregs[0] = CR0_RESET;
 104     env->cregs[14] = CR14_RESET;
 105
 106     /* architectured initial value for Breaking-Event-Address register */
 107     env->gbea = 1;
 108
 109     env->pfault_token = -1UL;
 110     env->ext_index = -1;
 111     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 112         env->io_index[i] = -1;
 113     }
 114
 115     /* tininess for underflow is detected before rounding */
 116     set_float_detect_tininess(float_tininess_before_rounding,
 117                               &env->fpu_status);
 118
 119     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 120     if (kvm_enabled()) {
 121         kvm_s390_reset_vcpu(cpu);
 122     }
 123 }
 124
 125 /* CPUClass:reset() */
 126 static void s390_cpu_full_reset(CPUState *s)
 127 {
 128     S390CPU *cpu = S390_CPU(s);
 129     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 130     CPUS390XState *env = &cpu->env;
 131     int i;
 132
 133     scc->parent_reset(s);
 134     cpu->env.sigp_order = 0;
 135     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 136
 137     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 138
 139     /* architectured initial values for CR 0 and 14 */
 140     env->cregs[0] = CR0_RESET;
 141     env->cregs[14] = CR14_RESET;
 142
 143     /* architectured initial value for Breaking-Event-Address register */
 144     env->gbea = 1;
 145
 146     env->pfault_token = -1UL;
 147     env->ext_index = -1;
 148     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 149         env->io_index[i] = -1;
 150     }
 151
 152     /* tininess for underflow is detected before rounding */
 153     set_float_detect_tininess(float_tininess_before_rounding,
 154                               &env->fpu_status);
 155
 156     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 157     if (kvm_enabled()) {
 158         kvm_s390_reset_vcpu(cpu);
 159     }
 160 }
 161
 162 #if !defined(CONFIG_USER_ONLY)
 163 static void s390_cpu_machine_reset_cb(void *opaque)
 164 {
 165     S390CPU *cpu = opaque;
 166
 167     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 168 }
 169 #endif
 170
 171 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 172 {
 173     info->mach = bfd_mach_s390_64;
 174     info->print_insn = print_insn_s390;
 175 }
 176
 177 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 178 {
 179     CPUState *cs = CPU(dev);
 180     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 181     S390CPU *cpu = S390_CPU(dev);
 182     CPUS390XState *env = &cpu->env;
 183     Error *err = NULL;
 184
 185     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 186     s390_realize_cpu_model(cs, &err);
 187     if (err) {
 188         goto out;
 189     }
 190
 191 #if !defined(CONFIG_USER_ONLY)
 192     if (cpu->id >= max_cpus) {
 193         error_setg(&err, "Unable to add CPU: %" PRIi64
 194                    ", max allowed: %d", cpu->id, max_cpus - 1);
 195         goto out;
 196     }
 197 #else
 198     /* implicitly set for linux-user only */
 199     cpu->id = scc->next_cpu_id;
 200 #endif
 201
 202     if (cpu_exists(cpu->id)) {
 203         error_setg(&err, "Unable to add CPU: %" PRIi64
 204                    ", it already exists", cpu->id);
 205         goto out;
 206     }
 207     if (cpu->id != scc->next_cpu_id) {
 208         error_setg(&err, "Unable to add CPU: %" PRIi64
 209                    ", The next available id is %" PRIi64, cpu->id,
 210                    scc->next_cpu_id);
 211         goto out;
 212     }
 213
 214     cpu_exec_realizefn(cs, &err);
 215     if (err != NULL) {
 216         goto out;
 217     }
 218     scc->next_cpu_id++;
 219
 220 #if !defined(CONFIG_USER_ONLY)
 221     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 222 #endif
 223     env->cpu_num = cpu->id;
 224     s390_cpu_gdb_init(cs);
 225     qemu_init_vcpu(cs);
 226 #if !defined(CONFIG_USER_ONLY)
 227     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 228 #else
 229     cpu_reset(cs);
 230 #endif
 231
 232     scc->parent_realize(dev, &err);
 233
 234 #if !defined(CONFIG_USER_ONLY)
 235     if (dev->hotplugged) {
 236         raise_irq_cpu_hotplug();
 237     }
 238 #endif
 239
 240 out:
 241     error_propagate(errp, err);
 242 }
 243
 244 static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
 245                              void *opaque, Error **errp)
 246 {
 247     S390CPU *cpu = S390_CPU(obj);
 248     int64_t value = cpu->id;
 249
 250     visit_type_int(v, name, &value, errp);
 251 }
 252
 253 static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
 254                              void *opaque, Error **errp)
 255 {
 256     S390CPU *cpu = S390_CPU(obj);
 257     DeviceState *dev = DEVICE(obj);
 258     const int64_t min = 0;
 259     const int64_t max = UINT32_MAX;
 260     Error *err = NULL;
 261     int64_t value;
 262
 263     if (dev->realized) {
 264         error_setg(errp, "Attempt to set property '%s' on '%s' after "
 265                    "it was realized", name, object_get_typename(obj));
 266         return;
 267     }
 268
 269     visit_type_int(v, name, &value, &err);
 270     if (err) {
 271         error_propagate(errp, err);
 272         return;
 273     }
 274     if (value < min || value > max) {
 275         error_setg(errp, "Property %s.%s doesn't take value %" PRId64
 276                    " (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
 277                    object_get_typename(obj), name, value, min, max);
 278         return;
 279     }
 280     cpu->id = value;
 281 }
 282
 283 static void s390_cpu_initfn(Object *obj)
 284 {
 285     CPUState *cs = CPU(obj);
 286     S390CPU *cpu = S390_CPU(obj);
 287     CPUS390XState *env = &cpu->env;
 288     static bool inited;
 289 #if !defined(CONFIG_USER_ONLY)
 290     struct tm tm;
 291 #endif
 292
 293     cs->env_ptr = env;
 294     cs->halted = 1;
 295     cs->exception_index = EXCP_HLT;
 296     object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
 297                         s390x_cpu_set_id, NULL, NULL, NULL);
 298     s390_cpu_model_register_props(obj);
 299 #if !defined(CONFIG_USER_ONLY)
 300     qemu_get_timedate(&tm, 0);
 301     env->tod_offset = TOD_UNIX_EPOCH +
 302                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 303     env->tod_basetime = 0;
 304     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 305     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 306     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 307 #endif
 308
 309     if (tcg_enabled() && !inited) {
 310         inited = true;
 311         s390x_translate_init();
 312     }
 313 }
 314
 315 static void s390_cpu_finalize(Object *obj)
 316 {
 317 #if !defined(CONFIG_USER_ONLY)
 318     S390CPU *cpu = S390_CPU(obj);
 319
 320     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 321     g_free(cpu->irqstate);
 322 #endif
 323 }
 324
 325 #if !defined(CONFIG_USER_ONLY)
 326 static bool disabled_wait(CPUState *cpu)
 327 {
 328     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 329                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 330 }
 331
 332 static unsigned s390_count_running_cpus(void)
 333 {
 334     CPUState *cpu;
 335     int nr_running = 0;
 336
 337     CPU_FOREACH(cpu) {
 338         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 339         if (state == CPU_STATE_OPERATING ||
 340             state == CPU_STATE_LOAD) {
 341             if (!disabled_wait(cpu)) {
 342                 nr_running++;
 343             }
 344         }
 345     }
 346
 347     return nr_running;
 348 }
 349
 350 unsigned int s390_cpu_halt(S390CPU *cpu)
 351 {
 352     CPUState *cs = CPU(cpu);
 353     trace_cpu_halt(cs->cpu_index);
 354
 355     if (!cs->halted) {
 356         cs->halted = 1;
 357         cs->exception_index = EXCP_HLT;
 358     }
 359
 360     return s390_count_running_cpus();
 361 }
 362
 363 void s390_cpu_unhalt(S390CPU *cpu)
 364 {
 365     CPUState *cs = CPU(cpu);
 366     trace_cpu_unhalt(cs->cpu_index);
 367
 368     if (cs->halted) {
 369         cs->halted = 0;
 370         cs->exception_index = -1;
 371     }
 372 }
 373
 374 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 375  {
 376     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 377
 378     switch (cpu_state) {
 379     case CPU_STATE_STOPPED:
 380     case CPU_STATE_CHECK_STOP:
 381         /* halt the cpu for common infrastructure */
 382         s390_cpu_halt(cpu);
 383         break;
 384     case CPU_STATE_OPERATING:
 385     case CPU_STATE_LOAD:
 386         /* unhalt the cpu for common infrastructure */
 387         s390_cpu_unhalt(cpu);
 388         break;
 389     default:
 390         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 391                      cpu_state);
 392         exit(1);
 393     }
 394     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 395         kvm_s390_set_cpu_state(cpu, cpu_state);
 396     }
 397     cpu->env.cpu_state = cpu_state;
 398
 399     return s390_count_running_cpus();
 400 }
 401
 402 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 403 {
 404     if (kvm_enabled()) {
 405         return kvm_s390_get_clock(tod_high, tod_low);
 406     }
 407     /* Fixme TCG */
 408     *tod_high = 0;
 409     *tod_low = 0;
 410     return 0;
 411 }
 412
 413 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 414 {
 415     if (kvm_enabled()) {
 416         return kvm_s390_set_clock(tod_high, tod_low);
 417     }
 418     /* Fixme TCG */
 419     return 0;
 420 }
 421
 422 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 423 {
 424     if (kvm_enabled()) {
 425         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 426     }
 427     return 0;
 428 }
 429
 430 void s390_cmma_reset(void)
 431 {
 432     if (kvm_enabled()) {
 433         kvm_s390_cmma_reset();
 434     }
 435 }
 436
 437 int s390_cpu_restart(S390CPU *cpu)
 438 {
 439     if (kvm_enabled()) {
 440         return kvm_s390_cpu_restart(cpu);
 441     }
 442     return -ENOSYS;
 443 }
 444
 445 int s390_get_memslot_count(void)
 446 {
 447     if (kvm_enabled()) {
 448         return kvm_s390_get_memslot_count();
 449     } else {
 450         return MAX_AVAIL_SLOTS;
 451     }
 452 }
 453
 454 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 455                                 int vq, bool assign)
 456 {
 457     if (kvm_enabled()) {
 458         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 459     } else {
 460         return 0;
 461     }
 462 }
 463
 464 void s390_crypto_reset(void)
 465 {
 466     if (kvm_enabled()) {
 467         kvm_s390_crypto_reset();
 468     }
 469 }
 470
 471 bool s390_get_squash_mcss(void)
 472 {
 473     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 474                                  NULL)) {
 475         return true;
 476     }
 477
 478     return false;
 479 }
 480
 481 void s390_enable_css_support(S390CPU *cpu)
 482 {
 483     if (kvm_enabled()) {
 484         kvm_s390_enable_css_support(cpu);
 485     }
 486 }
 487 #endif
 488
 489 static gchar *s390_gdb_arch_name(CPUState *cs)
 490 {
 491     return g_strdup("s390:64-bit");
 492 }
 493
 494 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 495 {
 496     S390CPUClass *scc = S390_CPU_CLASS(oc);
 497     CPUClass *cc = CPU_CLASS(scc);
 498     DeviceClass *dc = DEVICE_CLASS(oc);
 499
 500     scc->next_cpu_id = 0;
 501     scc->parent_realize = dc->realize;
 502     dc->realize = s390_cpu_realizefn;
 503
 504     scc->parent_reset = cc->reset;
 505 #if !defined(CONFIG_USER_ONLY)
 506     scc->load_normal = s390_cpu_load_normal;
 507 #endif
 508     scc->cpu_reset = s390_cpu_reset;
 509     scc->initial_cpu_reset = s390_cpu_initial_reset;
 510     cc->reset = s390_cpu_full_reset;
 511     cc->class_by_name = s390_cpu_class_by_name,
 512     cc->has_work = s390_cpu_has_work;
 513 #ifdef CONFIG_TCG
 514     cc->do_interrupt = s390_cpu_do_interrupt;
 515 #endif
 516     cc->dump_state = s390_cpu_dump_state;
 517     cc->set_pc = s390_cpu_set_pc;
 518     cc->gdb_read_register = s390_cpu_gdb_read_register;
 519     cc->gdb_write_register = s390_cpu_gdb_write_register;
 520 #ifdef CONFIG_USER_ONLY
 521     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 522 #else
 523     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 524     cc->vmsd = &vmstate_s390_cpu;
 525     cc->write_elf64_note = s390_cpu_write_elf64_note;
 526 #ifdef CONFIG_TCG
 527     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 528     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 529     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 530 #endif
 531 #endif
 532     cc->disas_set_info = s390_cpu_disas_set_info;
 533
 534     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 535     cc->gdb_core_xml_file = "s390x-core64.xml";
 536     cc->gdb_arch_name = s390_gdb_arch_name;
 537
 538     s390_cpu_model_class_register_props(oc);
 539 }
 540
 541 static const TypeInfo s390_cpu_type_info = {
 542     .name = TYPE_S390_CPU,
 543     .parent = TYPE_CPU,
 544     .instance_size = sizeof(S390CPU),
 545     .instance_init = s390_cpu_initfn,
 546     .instance_finalize = s390_cpu_finalize,
 547     .abstract = true,
 548     .class_size = sizeof(S390CPUClass),
 549     .class_init = s390_cpu_class_init,
 550 };
 551
 552 static void s390_cpu_register_types(void)
 553 {
 554     type_register_static(&s390_cpu_type_info);
 555 }
 556
 557 type_init(s390_cpu_register_types)