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 #endif
 198     if (cpu_exists(cpu->id)) {
 199         error_setg(&err, "Unable to add CPU: %" PRIi64
 200                    ", it already exists", cpu->id);
 201         goto out;
 202     }
 203     if (cpu->id != scc->next_cpu_id) {
 204         error_setg(&err, "Unable to add CPU: %" PRIi64
 205                    ", The next available id is %" PRIi64, cpu->id,
 206                    scc->next_cpu_id);
 207         goto out;
 208     }
 209
 210     cpu_exec_realizefn(cs, &err);
 211     if (err != NULL) {
 212         goto out;
 213     }
 214     scc->next_cpu_id++;
 215
 216 #if !defined(CONFIG_USER_ONLY)
 217     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 218 #endif
 219     env->cpu_num = cpu->id;
 220     s390_cpu_gdb_init(cs);
 221     qemu_init_vcpu(cs);
 222 #if !defined(CONFIG_USER_ONLY)
 223     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 224 #else
 225     cpu_reset(cs);
 226 #endif
 227
 228     scc->parent_realize(dev, &err);
 229
 230 #if !defined(CONFIG_USER_ONLY)
 231     if (dev->hotplugged) {
 232         raise_irq_cpu_hotplug();
 233     }
 234 #endif
 235
 236 out:
 237     error_propagate(errp, err);
 238 }
 239
 240 static void s390x_cpu_get_id(Object *obj, Visitor *v, const char *name,
 241                              void *opaque, Error **errp)
 242 {
 243     S390CPU *cpu = S390_CPU(obj);
 244     int64_t value = cpu->id;
 245
 246     visit_type_int(v, name, &value, errp);
 247 }
 248
 249 static void s390x_cpu_set_id(Object *obj, Visitor *v, const char *name,
 250                              void *opaque, Error **errp)
 251 {
 252     S390CPU *cpu = S390_CPU(obj);
 253     DeviceState *dev = DEVICE(obj);
 254     const int64_t min = 0;
 255     const int64_t max = UINT32_MAX;
 256     Error *err = NULL;
 257     int64_t value;
 258
 259     if (dev->realized) {
 260         error_setg(errp, "Attempt to set property '%s' on '%s' after "
 261                    "it was realized", name, object_get_typename(obj));
 262         return;
 263     }
 264
 265     visit_type_int(v, name, &value, &err);
 266     if (err) {
 267         error_propagate(errp, err);
 268         return;
 269     }
 270     if (value < min || value > max) {
 271         error_setg(errp, "Property %s.%s doesn't take value %" PRId64
 272                    " (minimum: %" PRId64 ", maximum: %" PRId64 ")" ,
 273                    object_get_typename(obj), name, value, min, max);
 274         return;
 275     }
 276     cpu->id = value;
 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     static bool inited;
 285 #if !defined(CONFIG_USER_ONLY)
 286     struct tm tm;
 287 #endif
 288
 289     cs->env_ptr = env;
 290     cs->halted = 1;
 291     cs->exception_index = EXCP_HLT;
 292     object_property_add(OBJECT(cpu), "id", "int64_t", s390x_cpu_get_id,
 293                         s390x_cpu_set_id, NULL, NULL, NULL);
 294     s390_cpu_model_register_props(obj);
 295 #if !defined(CONFIG_USER_ONLY)
 296     qemu_get_timedate(&tm, 0);
 297     env->tod_offset = TOD_UNIX_EPOCH +
 298                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 299     env->tod_basetime = 0;
 300     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 301     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 302     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 303 #endif
 304
 305     if (tcg_enabled() && !inited) {
 306         inited = true;
 307         s390x_translate_init();
 308     }
 309 }
 310
 311 static void s390_cpu_finalize(Object *obj)
 312 {
 313 #if !defined(CONFIG_USER_ONLY)
 314     S390CPU *cpu = S390_CPU(obj);
 315
 316     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 317     g_free(cpu->irqstate);
 318 #endif
 319 }
 320
 321 #if !defined(CONFIG_USER_ONLY)
 322 static bool disabled_wait(CPUState *cpu)
 323 {
 324     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 325                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 326 }
 327
 328 static unsigned s390_count_running_cpus(void)
 329 {
 330     CPUState *cpu;
 331     int nr_running = 0;
 332
 333     CPU_FOREACH(cpu) {
 334         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 335         if (state == CPU_STATE_OPERATING ||
 336             state == CPU_STATE_LOAD) {
 337             if (!disabled_wait(cpu)) {
 338                 nr_running++;
 339             }
 340         }
 341     }
 342
 343     return nr_running;
 344 }
 345
 346 unsigned int s390_cpu_halt(S390CPU *cpu)
 347 {
 348     CPUState *cs = CPU(cpu);
 349     trace_cpu_halt(cs->cpu_index);
 350
 351     if (!cs->halted) {
 352         cs->halted = 1;
 353         cs->exception_index = EXCP_HLT;
 354     }
 355
 356     return s390_count_running_cpus();
 357 }
 358
 359 void s390_cpu_unhalt(S390CPU *cpu)
 360 {
 361     CPUState *cs = CPU(cpu);
 362     trace_cpu_unhalt(cs->cpu_index);
 363
 364     if (cs->halted) {
 365         cs->halted = 0;
 366         cs->exception_index = -1;
 367     }
 368 }
 369
 370 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 371  {
 372     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 373
 374     switch (cpu_state) {
 375     case CPU_STATE_STOPPED:
 376     case CPU_STATE_CHECK_STOP:
 377         /* halt the cpu for common infrastructure */
 378         s390_cpu_halt(cpu);
 379         break;
 380     case CPU_STATE_OPERATING:
 381     case CPU_STATE_LOAD:
 382         /* unhalt the cpu for common infrastructure */
 383         s390_cpu_unhalt(cpu);
 384         break;
 385     default:
 386         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 387                      cpu_state);
 388         exit(1);
 389     }
 390     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 391         kvm_s390_set_cpu_state(cpu, cpu_state);
 392     }
 393     cpu->env.cpu_state = cpu_state;
 394
 395     return s390_count_running_cpus();
 396 }
 397
 398 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 399 {
 400     if (kvm_enabled()) {
 401         return kvm_s390_get_clock(tod_high, tod_low);
 402     }
 403     /* Fixme TCG */
 404     *tod_high = 0;
 405     *tod_low = 0;
 406     return 0;
 407 }
 408
 409 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 410 {
 411     if (kvm_enabled()) {
 412         return kvm_s390_set_clock(tod_high, tod_low);
 413     }
 414     /* Fixme TCG */
 415     return 0;
 416 }
 417
 418 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 419 {
 420     if (kvm_enabled()) {
 421         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 422     }
 423     return 0;
 424 }
 425
 426 void s390_cmma_reset(void)
 427 {
 428     if (kvm_enabled()) {
 429         kvm_s390_cmma_reset();
 430     }
 431 }
 432
 433 int s390_cpu_restart(S390CPU *cpu)
 434 {
 435     if (kvm_enabled()) {
 436         return kvm_s390_cpu_restart(cpu);
 437     }
 438     return -ENOSYS;
 439 }
 440
 441 int s390_get_memslot_count(void)
 442 {
 443     if (kvm_enabled()) {
 444         return kvm_s390_get_memslot_count();
 445     } else {
 446         return MAX_AVAIL_SLOTS;
 447     }
 448 }
 449
 450 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 451                                 int vq, bool assign)
 452 {
 453     if (kvm_enabled()) {
 454         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 455     } else {
 456         return 0;
 457     }
 458 }
 459
 460 void s390_crypto_reset(void)
 461 {
 462     if (kvm_enabled()) {
 463         kvm_s390_crypto_reset();
 464     }
 465 }
 466
 467 bool s390_get_squash_mcss(void)
 468 {
 469     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 470                                  NULL)) {
 471         return true;
 472     }
 473
 474     return false;
 475 }
 476
 477 void s390_enable_css_support(S390CPU *cpu)
 478 {
 479     if (kvm_enabled()) {
 480         kvm_s390_enable_css_support(cpu);
 481     }
 482 }
 483 #endif
 484
 485 static gchar *s390_gdb_arch_name(CPUState *cs)
 486 {
 487     return g_strdup("s390:64-bit");
 488 }
 489
 490 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 491 {
 492     S390CPUClass *scc = S390_CPU_CLASS(oc);
 493     CPUClass *cc = CPU_CLASS(scc);
 494     DeviceClass *dc = DEVICE_CLASS(oc);
 495
 496     scc->next_cpu_id = 0;
 497     scc->parent_realize = dc->realize;
 498     dc->realize = s390_cpu_realizefn;
 499
 500     scc->parent_reset = cc->reset;
 501 #if !defined(CONFIG_USER_ONLY)
 502     scc->load_normal = s390_cpu_load_normal;
 503 #endif
 504     scc->cpu_reset = s390_cpu_reset;
 505     scc->initial_cpu_reset = s390_cpu_initial_reset;
 506     cc->reset = s390_cpu_full_reset;
 507     cc->class_by_name = s390_cpu_class_by_name,
 508     cc->has_work = s390_cpu_has_work;
 509 #ifdef CONFIG_TCG
 510     cc->do_interrupt = s390_cpu_do_interrupt;
 511 #endif
 512     cc->dump_state = s390_cpu_dump_state;
 513     cc->set_pc = s390_cpu_set_pc;
 514     cc->gdb_read_register = s390_cpu_gdb_read_register;
 515     cc->gdb_write_register = s390_cpu_gdb_write_register;
 516 #ifdef CONFIG_USER_ONLY
 517     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 518 #else
 519     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 520     cc->vmsd = &vmstate_s390_cpu;
 521     cc->write_elf64_note = s390_cpu_write_elf64_note;
 522 #ifdef CONFIG_TCG
 523     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 524     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 525     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 526 #endif
 527 #endif
 528     cc->disas_set_info = s390_cpu_disas_set_info;
 529
 530     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 531     cc->gdb_core_xml_file = "s390x-core64.xml";
 532     cc->gdb_arch_name = s390_gdb_arch_name;
 533
 534     s390_cpu_model_class_register_props(oc);
 535 }
 536
 537 static const TypeInfo s390_cpu_type_info = {
 538     .name = TYPE_S390_CPU,
 539     .parent = TYPE_CPU,
 540     .instance_size = sizeof(S390CPU),
 541     .instance_init = s390_cpu_initfn,
 542     .instance_finalize = s390_cpu_finalize,
 543     .abstract = true,
 544     .class_size = sizeof(S390CPUClass),
 545     .class_init = s390_cpu_class_init,
 546 };
 547
 548 static void s390_cpu_register_types(void)
 549 {
 550     type_register_static(&s390_cpu_type_info);
 551 }
 552
 553 type_init(s390_cpu_register_types)