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 #include "hw/qdev-properties.h"
  40 #ifndef CONFIG_USER_ONLY
  41 #include "hw/hw.h"
  42 #include "sysemu/arch_init.h"
  43 #include "sysemu/sysemu.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     env->mchk_index = -1;
 115
 116     /* tininess for underflow is detected before rounding */
 117     set_float_detect_tininess(float_tininess_before_rounding,
 118                               &env->fpu_status);
 119
 120     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 121     if (kvm_enabled()) {
 122         kvm_s390_reset_vcpu(cpu);
 123     }
 124 }
 125
 126 /* CPUClass:reset() */
 127 static void s390_cpu_full_reset(CPUState *s)
 128 {
 129     S390CPU *cpu = S390_CPU(s);
 130     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 131     CPUS390XState *env = &cpu->env;
 132     int i;
 133
 134     scc->parent_reset(s);
 135     cpu->env.sigp_order = 0;
 136     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 137
 138     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 139
 140     /* architectured initial values for CR 0 and 14 */
 141     env->cregs[0] = CR0_RESET;
 142     env->cregs[14] = CR14_RESET;
 143
 144     /* architectured initial value for Breaking-Event-Address register */
 145     env->gbea = 1;
 146
 147     env->pfault_token = -1UL;
 148     env->ext_index = -1;
 149     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 150         env->io_index[i] = -1;
 151     }
 152     env->mchk_index = -1;
 153
 154     /* tininess for underflow is detected before rounding */
 155     set_float_detect_tininess(float_tininess_before_rounding,
 156                               &env->fpu_status);
 157
 158     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 159     if (kvm_enabled()) {
 160         kvm_s390_reset_vcpu(cpu);
 161     }
 162 }
 163
 164 #if !defined(CONFIG_USER_ONLY)
 165 static void s390_cpu_machine_reset_cb(void *opaque)
 166 {
 167     S390CPU *cpu = opaque;
 168
 169     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 170 }
 171 #endif
 172
 173 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 174 {
 175     info->mach = bfd_mach_s390_64;
 176     info->print_insn = print_insn_s390;
 177 }
 178
 179 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 180 {
 181     CPUState *cs = CPU(dev);
 182     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 183 #if !defined(CONFIG_USER_ONLY)
 184     S390CPU *cpu = S390_CPU(dev);
 185 #endif
 186     Error *err = NULL;
 187
 188     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 189     s390_realize_cpu_model(cs, &err);
 190     if (err) {
 191         goto out;
 192     }
 193
 194 #if !defined(CONFIG_USER_ONLY)
 195     if (cpu->env.core_id >= max_cpus) {
 196         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 197                    ", maximum core-id: %d", cpu->env.core_id,
 198                    max_cpus - 1);
 199         goto out;
 200     }
 201
 202     if (cpu_exists(cpu->env.core_id)) {
 203         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 204                    ", it already exists", cpu->env.core_id);
 205         goto out;
 206     }
 207
 208     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 209     cs->cpu_index = cpu->env.core_id;
 210 #endif
 211
 212     cpu_exec_realizefn(cs, &err);
 213     if (err != NULL) {
 214         goto out;
 215     }
 216
 217 #if !defined(CONFIG_USER_ONLY)
 218     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 219 #endif
 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 out:
 230     error_propagate(errp, err);
 231 }
 232
 233 static void s390_cpu_initfn(Object *obj)
 234 {
 235     CPUState *cs = CPU(obj);
 236     S390CPU *cpu = S390_CPU(obj);
 237     CPUS390XState *env = &cpu->env;
 238     static bool inited;
 239 #if !defined(CONFIG_USER_ONLY)
 240     struct tm tm;
 241 #endif
 242
 243     cs->env_ptr = env;
 244     cs->halted = 1;
 245     cs->exception_index = EXCP_HLT;
 246     s390_cpu_model_register_props(obj);
 247 #if !defined(CONFIG_USER_ONLY)
 248     qemu_get_timedate(&tm, 0);
 249     env->tod_offset = TOD_UNIX_EPOCH +
 250                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 251     env->tod_basetime = 0;
 252     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 253     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 254     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 255 #endif
 256
 257     if (tcg_enabled() && !inited) {
 258         inited = true;
 259         s390x_translate_init();
 260     }
 261 }
 262
 263 static void s390_cpu_finalize(Object *obj)
 264 {
 265 #if !defined(CONFIG_USER_ONLY)
 266     S390CPU *cpu = S390_CPU(obj);
 267
 268     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 269     g_free(cpu->irqstate);
 270 #endif
 271 }
 272
 273 #if !defined(CONFIG_USER_ONLY)
 274 static bool disabled_wait(CPUState *cpu)
 275 {
 276     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 277                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 278 }
 279
 280 static unsigned s390_count_running_cpus(void)
 281 {
 282     CPUState *cpu;
 283     int nr_running = 0;
 284
 285     CPU_FOREACH(cpu) {
 286         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 287         if (state == CPU_STATE_OPERATING ||
 288             state == CPU_STATE_LOAD) {
 289             if (!disabled_wait(cpu)) {
 290                 nr_running++;
 291             }
 292         }
 293     }
 294
 295     return nr_running;
 296 }
 297
 298 unsigned int s390_cpu_halt(S390CPU *cpu)
 299 {
 300     CPUState *cs = CPU(cpu);
 301     trace_cpu_halt(cs->cpu_index);
 302
 303     if (!cs->halted) {
 304         cs->halted = 1;
 305         cs->exception_index = EXCP_HLT;
 306     }
 307
 308     return s390_count_running_cpus();
 309 }
 310
 311 void s390_cpu_unhalt(S390CPU *cpu)
 312 {
 313     CPUState *cs = CPU(cpu);
 314     trace_cpu_unhalt(cs->cpu_index);
 315
 316     if (cs->halted) {
 317         cs->halted = 0;
 318         cs->exception_index = -1;
 319     }
 320 }
 321
 322 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 323  {
 324     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 325
 326     switch (cpu_state) {
 327     case CPU_STATE_STOPPED:
 328     case CPU_STATE_CHECK_STOP:
 329         /* halt the cpu for common infrastructure */
 330         s390_cpu_halt(cpu);
 331         break;
 332     case CPU_STATE_OPERATING:
 333     case CPU_STATE_LOAD:
 334         /* unhalt the cpu for common infrastructure */
 335         s390_cpu_unhalt(cpu);
 336         break;
 337     default:
 338         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 339                      cpu_state);
 340         exit(1);
 341     }
 342     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 343         kvm_s390_set_cpu_state(cpu, cpu_state);
 344     }
 345     cpu->env.cpu_state = cpu_state;
 346
 347     return s390_count_running_cpus();
 348 }
 349
 350 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 351 {
 352     int r = 0;
 353
 354     if (kvm_enabled()) {
 355         r = kvm_s390_get_clock_ext(tod_high, tod_low);
 356         if (r == -ENXIO) {
 357             return kvm_s390_get_clock(tod_high, tod_low);
 358         }
 359     } else {
 360         /* Fixme TCG */
 361         *tod_high = 0;
 362         *tod_low = 0;
 363     }
 364
 365     return r;
 366 }
 367
 368 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 369 {
 370     int r = 0;
 371
 372     if (kvm_enabled()) {
 373         r = kvm_s390_set_clock_ext(tod_high, tod_low);
 374         if (r == -ENXIO) {
 375             return kvm_s390_set_clock(tod_high, tod_low);
 376         }
 377     }
 378     /* Fixme TCG */
 379     return r;
 380 }
 381
 382 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 383 {
 384     if (kvm_enabled()) {
 385         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 386     }
 387     return 0;
 388 }
 389
 390 void s390_cmma_reset(void)
 391 {
 392     if (kvm_enabled()) {
 393         kvm_s390_cmma_reset();
 394     }
 395 }
 396
 397 int s390_cpu_restart(S390CPU *cpu)
 398 {
 399     if (kvm_enabled()) {
 400         return kvm_s390_cpu_restart(cpu);
 401     }
 402     return -ENOSYS;
 403 }
 404
 405 int s390_get_memslot_count(void)
 406 {
 407     if (kvm_enabled()) {
 408         return kvm_s390_get_memslot_count();
 409     } else {
 410         return MAX_AVAIL_SLOTS;
 411     }
 412 }
 413
 414 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 415                                 int vq, bool assign)
 416 {
 417     if (kvm_enabled()) {
 418         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 419     } else {
 420         return 0;
 421     }
 422 }
 423
 424 void s390_crypto_reset(void)
 425 {
 426     if (kvm_enabled()) {
 427         kvm_s390_crypto_reset();
 428     }
 429 }
 430
 431 bool s390_get_squash_mcss(void)
 432 {
 433     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 434                                  NULL)) {
 435         return true;
 436     }
 437
 438     return false;
 439 }
 440
 441 void s390_enable_css_support(S390CPU *cpu)
 442 {
 443     if (kvm_enabled()) {
 444         kvm_s390_enable_css_support(cpu);
 445     }
 446 }
 447 #endif
 448
 449 static gchar *s390_gdb_arch_name(CPUState *cs)
 450 {
 451     return g_strdup("s390:64-bit");
 452 }
 453
 454 static Property s390x_cpu_properties[] = {
 455 #if !defined(CONFIG_USER_ONLY)
 456     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 457 #endif
 458     DEFINE_PROP_END_OF_LIST()
 459 };
 460
 461 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 462 {
 463     S390CPUClass *scc = S390_CPU_CLASS(oc);
 464     CPUClass *cc = CPU_CLASS(scc);
 465     DeviceClass *dc = DEVICE_CLASS(oc);
 466
 467     scc->parent_realize = dc->realize;
 468     dc->realize = s390_cpu_realizefn;
 469     dc->props = s390x_cpu_properties;
 470     dc->user_creatable = true;
 471
 472     scc->parent_reset = cc->reset;
 473 #if !defined(CONFIG_USER_ONLY)
 474     scc->load_normal = s390_cpu_load_normal;
 475 #endif
 476     scc->cpu_reset = s390_cpu_reset;
 477     scc->initial_cpu_reset = s390_cpu_initial_reset;
 478     cc->reset = s390_cpu_full_reset;
 479     cc->class_by_name = s390_cpu_class_by_name,
 480     cc->has_work = s390_cpu_has_work;
 481 #ifdef CONFIG_TCG
 482     cc->do_interrupt = s390_cpu_do_interrupt;
 483 #endif
 484     cc->dump_state = s390_cpu_dump_state;
 485     cc->set_pc = s390_cpu_set_pc;
 486     cc->gdb_read_register = s390_cpu_gdb_read_register;
 487     cc->gdb_write_register = s390_cpu_gdb_write_register;
 488 #ifdef CONFIG_USER_ONLY
 489     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 490 #else
 491     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 492     cc->vmsd = &vmstate_s390_cpu;
 493     cc->write_elf64_note = s390_cpu_write_elf64_note;
 494 #ifdef CONFIG_TCG
 495     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 496     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 497     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 498 #endif
 499 #endif
 500     cc->disas_set_info = s390_cpu_disas_set_info;
 501
 502     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 503     cc->gdb_core_xml_file = "s390x-core64.xml";
 504     cc->gdb_arch_name = s390_gdb_arch_name;
 505
 506     s390_cpu_model_class_register_props(oc);
 507 }
 508
 509 static const TypeInfo s390_cpu_type_info = {
 510     .name = TYPE_S390_CPU,
 511     .parent = TYPE_CPU,
 512     .instance_size = sizeof(S390CPU),
 513     .instance_init = s390_cpu_initfn,
 514     .instance_finalize = s390_cpu_finalize,
 515     .abstract = true,
 516     .class_size = sizeof(S390CPUClass),
 517     .class_init = s390_cpu_class_init,
 518 };
 519
 520 static void s390_cpu_register_types(void)
 521 {
 522     type_register_static(&s390_cpu_type_info);
 523 }
 524
 525 type_init(s390_cpu_register_types)