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 "qapi/qapi-visit-misc.h"
  39 #include "qapi/qapi-visit-run-state.h"
  40 #include "sysemu/hw_accel.h"
  41 #include "exec/exec-all.h"
  42 #include "hw/qdev-properties.h"
  43 #ifndef CONFIG_USER_ONLY
  44 #include "hw/hw.h"
  45 #include "sysemu/arch_init.h"
  46 #include "sysemu/sysemu.h"
  47 #endif
  48 #include "fpu/softfloat.h"
  49
  50 #define CR0_RESET       0xE0UL
  51 #define CR14_RESET      0xC2000000UL;
  52
  53 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  54 {
  55     S390CPU *cpu = S390_CPU(cs);
  56
  57     cpu->env.psw.addr = value;
  58 }
  59
  60 static bool s390_cpu_has_work(CPUState *cs)
  61 {
  62     S390CPU *cpu = S390_CPU(cs);
  63
  64     /* STOPPED cpus can never wake up */
  65     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
  66         s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
  67         return false;
  68     }
  69
  70     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
  71         return false;
  72     }
  73
  74     return s390_cpu_has_int(cpu);
  75 }
  76
  77 #if !defined(CONFIG_USER_ONLY)
  78 /* S390CPUClass::load_normal() */
  79 static void s390_cpu_load_normal(CPUState *s)
  80 {
  81     S390CPU *cpu = S390_CPU(s);
  82     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  83     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  84     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  85 }
  86 #endif
  87
  88 /* S390CPUClass::cpu_reset() */
  89 static void s390_cpu_reset(CPUState *s)
  90 {
  91     S390CPU *cpu = S390_CPU(s);
  92     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  93     CPUS390XState *env = &cpu->env;
  94
  95     env->pfault_token = -1UL;
  96     env->bpbc = false;
  97     scc->parent_reset(s);
  98     cpu->env.sigp_order = 0;
  99     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 100 }
 101
 102 /* S390CPUClass::initial_reset() */
 103 static void s390_cpu_initial_reset(CPUState *s)
 104 {
 105     S390CPU *cpu = S390_CPU(s);
 106     CPUS390XState *env = &cpu->env;
 107
 108     s390_cpu_reset(s);
 109     /* initial reset does not clear everything! */
 110     memset(&env->start_initial_reset_fields, 0,
 111         offsetof(CPUS390XState, end_reset_fields) -
 112         offsetof(CPUS390XState, start_initial_reset_fields));
 113
 114     /* architectured initial values for CR 0 and 14 */
 115     env->cregs[0] = CR0_RESET;
 116     env->cregs[14] = CR14_RESET;
 117
 118     /* architectured initial value for Breaking-Event-Address register */
 119     env->gbea = 1;
 120
 121     env->pfault_token = -1UL;
 122
 123     /* tininess for underflow is detected before rounding */
 124     set_float_detect_tininess(float_tininess_before_rounding,
 125                               &env->fpu_status);
 126
 127     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 128     if (kvm_enabled()) {
 129         kvm_s390_reset_vcpu(cpu);
 130     }
 131 }
 132
 133 /* CPUClass:reset() */
 134 static void s390_cpu_full_reset(CPUState *s)
 135 {
 136     S390CPU *cpu = S390_CPU(s);
 137     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 138     CPUS390XState *env = &cpu->env;
 139
 140     scc->parent_reset(s);
 141     cpu->env.sigp_order = 0;
 142     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 143
 144     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 145
 146     /* architectured initial values for CR 0 and 14 */
 147     env->cregs[0] = CR0_RESET;
 148     env->cregs[14] = CR14_RESET;
 149
 150     /* architectured initial value for Breaking-Event-Address register */
 151     env->gbea = 1;
 152
 153     env->pfault_token = -1UL;
 154
 155     /* tininess for underflow is detected before rounding */
 156     set_float_detect_tininess(float_tininess_before_rounding,
 157                               &env->fpu_status);
 158
 159     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 160     if (kvm_enabled()) {
 161         kvm_s390_reset_vcpu(cpu);
 162     }
 163 }
 164
 165 #if !defined(CONFIG_USER_ONLY)
 166 static void s390_cpu_machine_reset_cb(void *opaque)
 167 {
 168     S390CPU *cpu = opaque;
 169
 170     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 171 }
 172 #endif
 173
 174 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 175 {
 176     info->mach = bfd_mach_s390_64;
 177     info->print_insn = print_insn_s390;
 178 }
 179
 180 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 181 {
 182     CPUState *cs = CPU(dev);
 183     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 184 #if !defined(CONFIG_USER_ONLY)
 185     S390CPU *cpu = S390_CPU(dev);
 186 #endif
 187     Error *err = NULL;
 188
 189     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 190     s390_realize_cpu_model(cs, &err);
 191     if (err) {
 192         goto out;
 193     }
 194
 195 #if !defined(CONFIG_USER_ONLY)
 196     if (cpu->env.core_id >= max_cpus) {
 197         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 198                    ", maximum core-id: %d", cpu->env.core_id,
 199                    max_cpus - 1);
 200         goto out;
 201     }
 202
 203     if (cpu_exists(cpu->env.core_id)) {
 204         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 205                    ", it already exists", cpu->env.core_id);
 206         goto out;
 207     }
 208
 209     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 210     cs->cpu_index = cpu->env.core_id;
 211 #endif
 212
 213     cpu_exec_realizefn(cs, &err);
 214     if (err != NULL) {
 215         goto out;
 216     }
 217
 218 #if !defined(CONFIG_USER_ONLY)
 219     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 220 #endif
 221     s390_cpu_gdb_init(cs);
 222     qemu_init_vcpu(cs);
 223 #if !defined(CONFIG_USER_ONLY)
 224     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 225 #else
 226     cpu_reset(cs);
 227 #endif
 228
 229     scc->parent_realize(dev, &err);
 230 out:
 231     error_propagate(errp, err);
 232 }
 233
 234 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 235 {
 236     GuestPanicInformation *panic_info;
 237     S390CPU *cpu = S390_CPU(cs);
 238
 239     cpu_synchronize_state(cs);
 240     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 241
 242     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 243 #if !defined(CONFIG_USER_ONLY)
 244     panic_info->u.s390.core = cpu->env.core_id;
 245 #else
 246     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 247 #endif
 248     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 249     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 250     panic_info->u.s390.reason = cpu->env.crash_reason;
 251
 252     return panic_info;
 253 }
 254
 255 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 256                                         const char *name, void *opaque,
 257                                         Error **errp)
 258 {
 259     CPUState *cs = CPU(obj);
 260     GuestPanicInformation *panic_info;
 261
 262     if (!cs->crash_occurred) {
 263         error_setg(errp, "No crash occurred");
 264         return;
 265     }
 266
 267     panic_info = s390_cpu_get_crash_info(cs);
 268
 269     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 270                                      errp);
 271     qapi_free_GuestPanicInformation(panic_info);
 272 }
 273
 274 static void s390_cpu_initfn(Object *obj)
 275 {
 276     CPUState *cs = CPU(obj);
 277     S390CPU *cpu = S390_CPU(obj);
 278     CPUS390XState *env = &cpu->env;
 279 #if !defined(CONFIG_USER_ONLY)
 280     struct tm tm;
 281 #endif
 282
 283     cs->env_ptr = env;
 284     cs->halted = 1;
 285     cs->exception_index = EXCP_HLT;
 286     object_property_add(obj, "crash-information", "GuestPanicInformation",
 287                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 288     s390_cpu_model_register_props(obj);
 289 #if !defined(CONFIG_USER_ONLY)
 290     qemu_get_timedate(&tm, 0);
 291     env->tod_offset = TOD_UNIX_EPOCH +
 292                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 293     env->tod_basetime = 0;
 294     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 295     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 296     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 297 #endif
 298 }
 299
 300 static void s390_cpu_finalize(Object *obj)
 301 {
 302 #if !defined(CONFIG_USER_ONLY)
 303     S390CPU *cpu = S390_CPU(obj);
 304
 305     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 306     g_free(cpu->irqstate);
 307 #endif
 308 }
 309
 310 #if !defined(CONFIG_USER_ONLY)
 311 static bool disabled_wait(CPUState *cpu)
 312 {
 313     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 314                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 315 }
 316
 317 static unsigned s390_count_running_cpus(void)
 318 {
 319     CPUState *cpu;
 320     int nr_running = 0;
 321
 322     CPU_FOREACH(cpu) {
 323         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 324         if (state == S390_CPU_STATE_OPERATING ||
 325             state == S390_CPU_STATE_LOAD) {
 326             if (!disabled_wait(cpu)) {
 327                 nr_running++;
 328             }
 329         }
 330     }
 331
 332     return nr_running;
 333 }
 334
 335 unsigned int s390_cpu_halt(S390CPU *cpu)
 336 {
 337     CPUState *cs = CPU(cpu);
 338     trace_cpu_halt(cs->cpu_index);
 339
 340     if (!cs->halted) {
 341         cs->halted = 1;
 342         cs->exception_index = EXCP_HLT;
 343     }
 344
 345     return s390_count_running_cpus();
 346 }
 347
 348 void s390_cpu_unhalt(S390CPU *cpu)
 349 {
 350     CPUState *cs = CPU(cpu);
 351     trace_cpu_unhalt(cs->cpu_index);
 352
 353     if (cs->halted) {
 354         cs->halted = 0;
 355         cs->exception_index = -1;
 356     }
 357 }
 358
 359 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 360  {
 361     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 362
 363     switch (cpu_state) {
 364     case S390_CPU_STATE_STOPPED:
 365     case S390_CPU_STATE_CHECK_STOP:
 366         /* halt the cpu for common infrastructure */
 367         s390_cpu_halt(cpu);
 368         break;
 369     case S390_CPU_STATE_OPERATING:
 370     case S390_CPU_STATE_LOAD:
 371         /*
 372          * Starting a CPU with a PSW WAIT bit set:
 373          * KVM: handles this internally and triggers another WAIT exit.
 374          * TCG: will actually try to continue to run. Don't unhalt, will
 375          *      be done when the CPU actually has work (an interrupt).
 376          */
 377         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 378             s390_cpu_unhalt(cpu);
 379         }
 380         break;
 381     default:
 382         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 383                      cpu_state);
 384         exit(1);
 385     }
 386     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 387         kvm_s390_set_cpu_state(cpu, cpu_state);
 388     }
 389     cpu->env.cpu_state = cpu_state;
 390
 391     return s390_count_running_cpus();
 392 }
 393
 394 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 395 {
 396     int r = 0;
 397
 398     if (kvm_enabled()) {
 399         r = kvm_s390_get_clock_ext(tod_high, tod_low);
 400         if (r == -ENXIO) {
 401             return kvm_s390_get_clock(tod_high, tod_low);
 402         }
 403     } else {
 404         /* Fixme TCG */
 405         *tod_high = 0;
 406         *tod_low = 0;
 407     }
 408
 409     return r;
 410 }
 411
 412 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 413 {
 414     int r = 0;
 415
 416     if (kvm_enabled()) {
 417         r = kvm_s390_set_clock_ext(tod_high, tod_low);
 418         if (r == -ENXIO) {
 419             return kvm_s390_set_clock(tod_high, tod_low);
 420         }
 421     }
 422     /* Fixme TCG */
 423     return r;
 424 }
 425
 426 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 427 {
 428     if (kvm_enabled()) {
 429         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 430     }
 431     return 0;
 432 }
 433
 434 void s390_cmma_reset(void)
 435 {
 436     if (kvm_enabled()) {
 437         kvm_s390_cmma_reset();
 438     }
 439 }
 440
 441 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 442                                 int vq, bool assign)
 443 {
 444     if (kvm_enabled()) {
 445         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 446     } else {
 447         return 0;
 448     }
 449 }
 450
 451 void s390_crypto_reset(void)
 452 {
 453     if (kvm_enabled()) {
 454         kvm_s390_crypto_reset();
 455     }
 456 }
 457
 458 bool s390_get_squash_mcss(void)
 459 {
 460     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 461                                  NULL)) {
 462         return true;
 463     }
 464
 465     return false;
 466 }
 467
 468 void s390_enable_css_support(S390CPU *cpu)
 469 {
 470     if (kvm_enabled()) {
 471         kvm_s390_enable_css_support(cpu);
 472     }
 473 }
 474 #endif
 475
 476 static gchar *s390_gdb_arch_name(CPUState *cs)
 477 {
 478     return g_strdup("s390:64-bit");
 479 }
 480
 481 static Property s390x_cpu_properties[] = {
 482 #if !defined(CONFIG_USER_ONLY)
 483     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 484 #endif
 485     DEFINE_PROP_END_OF_LIST()
 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     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 495                                     &scc->parent_realize);
 496     dc->props = s390x_cpu_properties;
 497     dc->user_creatable = true;
 498
 499     scc->parent_reset = cc->reset;
 500 #if !defined(CONFIG_USER_ONLY)
 501     scc->load_normal = s390_cpu_load_normal;
 502 #endif
 503     scc->cpu_reset = s390_cpu_reset;
 504     scc->initial_cpu_reset = s390_cpu_initial_reset;
 505     cc->reset = s390_cpu_full_reset;
 506     cc->class_by_name = s390_cpu_class_by_name,
 507     cc->has_work = s390_cpu_has_work;
 508 #ifdef CONFIG_TCG
 509     cc->do_interrupt = s390_cpu_do_interrupt;
 510 #endif
 511     cc->dump_state = s390_cpu_dump_state;
 512     cc->get_crash_info = s390_cpu_get_crash_info;
 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 #ifdef CONFIG_TCG
 530     cc->tcg_initialize = s390x_translate_init;
 531 #endif
 532
 533     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 534     cc->gdb_core_xml_file = "s390x-core64.xml";
 535     cc->gdb_arch_name = s390_gdb_arch_name;
 536
 537     s390_cpu_model_class_register_props(oc);
 538 }
 539
 540 static const TypeInfo s390_cpu_type_info = {
 541     .name = TYPE_S390_CPU,
 542     .parent = TYPE_CPU,
 543     .instance_size = sizeof(S390CPU),
 544     .instance_init = s390_cpu_initfn,
 545     .instance_finalize = s390_cpu_finalize,
 546     .abstract = true,
 547     .class_size = sizeof(S390CPUClass),
 548     .class_init = s390_cpu_class_init,
 549 };
 550
 551 static void s390_cpu_register_types(void)
 552 {
 553     type_register_static(&s390_cpu_type_info);
 554 }
 555
 556 type_init(s390_cpu_register_types)