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-visit.h"
  39 #include "sysemu/hw_accel.h"
  40 #include "exec/exec-all.h"
  41 #include "hw/qdev-properties.h"
  42 #ifndef CONFIG_USER_ONLY
  43 #include "hw/hw.h"
  44 #include "sysemu/arch_init.h"
  45 #include "sysemu/sysemu.h"
  46 #endif
  47 #include "fpu/softfloat.h"
  48
  49 #define CR0_RESET       0xE0UL
  50 #define CR14_RESET      0xC2000000UL;
  51
  52 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  53 {
  54     S390CPU *cpu = S390_CPU(cs);
  55
  56     cpu->env.psw.addr = value;
  57 }
  58
  59 static bool s390_cpu_has_work(CPUState *cs)
  60 {
  61     S390CPU *cpu = S390_CPU(cs);
  62
  63     /* STOPPED cpus can never wake up */
  64     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
  65         s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
  66         return false;
  67     }
  68
  69     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
  70         return false;
  71     }
  72
  73     return s390_cpu_has_int(cpu);
  74 }
  75
  76 #if !defined(CONFIG_USER_ONLY)
  77 /* S390CPUClass::load_normal() */
  78 static void s390_cpu_load_normal(CPUState *s)
  79 {
  80     S390CPU *cpu = S390_CPU(s);
  81     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  82     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  83     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  84 }
  85 #endif
  86
  87 /* S390CPUClass::cpu_reset() */
  88 static void s390_cpu_reset(CPUState *s)
  89 {
  90     S390CPU *cpu = S390_CPU(s);
  91     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  92     CPUS390XState *env = &cpu->env;
  93
  94     env->pfault_token = -1UL;
  95     env->bpbc = false;
  96     scc->parent_reset(s);
  97     cpu->env.sigp_order = 0;
  98     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
  99 }
 100
 101 /* S390CPUClass::initial_reset() */
 102 static void s390_cpu_initial_reset(CPUState *s)
 103 {
 104     S390CPU *cpu = S390_CPU(s);
 105     CPUS390XState *env = &cpu->env;
 106
 107     s390_cpu_reset(s);
 108     /* initial reset does not clear everything! */
 109     memset(&env->start_initial_reset_fields, 0,
 110         offsetof(CPUS390XState, end_reset_fields) -
 111         offsetof(CPUS390XState, start_initial_reset_fields));
 112
 113     /* architectured initial values for CR 0 and 14 */
 114     env->cregs[0] = CR0_RESET;
 115     env->cregs[14] = CR14_RESET;
 116
 117     /* architectured initial value for Breaking-Event-Address register */
 118     env->gbea = 1;
 119
 120     env->pfault_token = -1UL;
 121
 122     /* tininess for underflow is detected before rounding */
 123     set_float_detect_tininess(float_tininess_before_rounding,
 124                               &env->fpu_status);
 125
 126     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 127     if (kvm_enabled()) {
 128         kvm_s390_reset_vcpu(cpu);
 129     }
 130 }
 131
 132 /* CPUClass:reset() */
 133 static void s390_cpu_full_reset(CPUState *s)
 134 {
 135     S390CPU *cpu = S390_CPU(s);
 136     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 137     CPUS390XState *env = &cpu->env;
 138
 139     scc->parent_reset(s);
 140     cpu->env.sigp_order = 0;
 141     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 142
 143     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 144
 145     /* architectured initial values for CR 0 and 14 */
 146     env->cregs[0] = CR0_RESET;
 147     env->cregs[14] = CR14_RESET;
 148
 149     /* architectured initial value for Breaking-Event-Address register */
 150     env->gbea = 1;
 151
 152     env->pfault_token = -1UL;
 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 GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 234 {
 235     GuestPanicInformation *panic_info;
 236     S390CPU *cpu = S390_CPU(cs);
 237
 238     cpu_synchronize_state(cs);
 239     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 240
 241     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 242 #if !defined(CONFIG_USER_ONLY)
 243     panic_info->u.s390.core = cpu->env.core_id;
 244 #else
 245     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 246 #endif
 247     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 248     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 249     panic_info->u.s390.reason = cpu->env.crash_reason;
 250
 251     return panic_info;
 252 }
 253
 254 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 255                                         const char *name, void *opaque,
 256                                         Error **errp)
 257 {
 258     CPUState *cs = CPU(obj);
 259     GuestPanicInformation *panic_info;
 260
 261     if (!cs->crash_occurred) {
 262         error_setg(errp, "No crash occurred");
 263         return;
 264     }
 265
 266     panic_info = s390_cpu_get_crash_info(cs);
 267
 268     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 269                                      errp);
 270     qapi_free_GuestPanicInformation(panic_info);
 271 }
 272
 273 static void s390_cpu_initfn(Object *obj)
 274 {
 275     CPUState *cs = CPU(obj);
 276     S390CPU *cpu = S390_CPU(obj);
 277     CPUS390XState *env = &cpu->env;
 278 #if !defined(CONFIG_USER_ONLY)
 279     struct tm tm;
 280 #endif
 281
 282     cs->env_ptr = env;
 283     cs->halted = 1;
 284     cs->exception_index = EXCP_HLT;
 285     object_property_add(obj, "crash-information", "GuestPanicInformation",
 286                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 287     s390_cpu_model_register_props(obj);
 288 #if !defined(CONFIG_USER_ONLY)
 289     qemu_get_timedate(&tm, 0);
 290     env->tod_offset = TOD_UNIX_EPOCH +
 291                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 292     env->tod_basetime = 0;
 293     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 294     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 295     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 296 #endif
 297 }
 298
 299 static void s390_cpu_finalize(Object *obj)
 300 {
 301 #if !defined(CONFIG_USER_ONLY)
 302     S390CPU *cpu = S390_CPU(obj);
 303
 304     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 305     g_free(cpu->irqstate);
 306 #endif
 307 }
 308
 309 #if !defined(CONFIG_USER_ONLY)
 310 static bool disabled_wait(CPUState *cpu)
 311 {
 312     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 313                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 314 }
 315
 316 static unsigned s390_count_running_cpus(void)
 317 {
 318     CPUState *cpu;
 319     int nr_running = 0;
 320
 321     CPU_FOREACH(cpu) {
 322         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 323         if (state == S390_CPU_STATE_OPERATING ||
 324             state == S390_CPU_STATE_LOAD) {
 325             if (!disabled_wait(cpu)) {
 326                 nr_running++;
 327             }
 328         }
 329     }
 330
 331     return nr_running;
 332 }
 333
 334 unsigned int s390_cpu_halt(S390CPU *cpu)
 335 {
 336     CPUState *cs = CPU(cpu);
 337     trace_cpu_halt(cs->cpu_index);
 338
 339     if (!cs->halted) {
 340         cs->halted = 1;
 341         cs->exception_index = EXCP_HLT;
 342     }
 343
 344     return s390_count_running_cpus();
 345 }
 346
 347 void s390_cpu_unhalt(S390CPU *cpu)
 348 {
 349     CPUState *cs = CPU(cpu);
 350     trace_cpu_unhalt(cs->cpu_index);
 351
 352     if (cs->halted) {
 353         cs->halted = 0;
 354         cs->exception_index = -1;
 355     }
 356 }
 357
 358 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 359  {
 360     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 361
 362     switch (cpu_state) {
 363     case S390_CPU_STATE_STOPPED:
 364     case S390_CPU_STATE_CHECK_STOP:
 365         /* halt the cpu for common infrastructure */
 366         s390_cpu_halt(cpu);
 367         break;
 368     case S390_CPU_STATE_OPERATING:
 369     case S390_CPU_STATE_LOAD:
 370         /*
 371          * Starting a CPU with a PSW WAIT bit set:
 372          * KVM: handles this internally and triggers another WAIT exit.
 373          * TCG: will actually try to continue to run. Don't unhalt, will
 374          *      be done when the CPU actually has work (an interrupt).
 375          */
 376         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 377             s390_cpu_unhalt(cpu);
 378         }
 379         break;
 380     default:
 381         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 382                      cpu_state);
 383         exit(1);
 384     }
 385     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 386         kvm_s390_set_cpu_state(cpu, cpu_state);
 387     }
 388     cpu->env.cpu_state = cpu_state;
 389
 390     return s390_count_running_cpus();
 391 }
 392
 393 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 394 {
 395     int r = 0;
 396
 397     if (kvm_enabled()) {
 398         r = kvm_s390_get_clock_ext(tod_high, tod_low);
 399         if (r == -ENXIO) {
 400             return kvm_s390_get_clock(tod_high, tod_low);
 401         }
 402     } else {
 403         /* Fixme TCG */
 404         *tod_high = 0;
 405         *tod_low = 0;
 406     }
 407
 408     return r;
 409 }
 410
 411 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 412 {
 413     int r = 0;
 414
 415     if (kvm_enabled()) {
 416         r = kvm_s390_set_clock_ext(tod_high, tod_low);
 417         if (r == -ENXIO) {
 418             return kvm_s390_set_clock(tod_high, tod_low);
 419         }
 420     }
 421     /* Fixme TCG */
 422     return r;
 423 }
 424
 425 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 426 {
 427     if (kvm_enabled()) {
 428         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 429     }
 430     return 0;
 431 }
 432
 433 void s390_cmma_reset(void)
 434 {
 435     if (kvm_enabled()) {
 436         kvm_s390_cmma_reset();
 437     }
 438 }
 439
 440 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 441                                 int vq, bool assign)
 442 {
 443     if (kvm_enabled()) {
 444         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 445     } else {
 446         return 0;
 447     }
 448 }
 449
 450 void s390_crypto_reset(void)
 451 {
 452     if (kvm_enabled()) {
 453         kvm_s390_crypto_reset();
 454     }
 455 }
 456
 457 bool s390_get_squash_mcss(void)
 458 {
 459     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 460                                  NULL)) {
 461         return true;
 462     }
 463
 464     return false;
 465 }
 466
 467 void s390_enable_css_support(S390CPU *cpu)
 468 {
 469     if (kvm_enabled()) {
 470         kvm_s390_enable_css_support(cpu);
 471     }
 472 }
 473 #endif
 474
 475 static gchar *s390_gdb_arch_name(CPUState *cs)
 476 {
 477     return g_strdup("s390:64-bit");
 478 }
 479
 480 static Property s390x_cpu_properties[] = {
 481 #if !defined(CONFIG_USER_ONLY)
 482     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 483 #endif
 484     DEFINE_PROP_END_OF_LIST()
 485 };
 486
 487 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 488 {
 489     S390CPUClass *scc = S390_CPU_CLASS(oc);
 490     CPUClass *cc = CPU_CLASS(scc);
 491     DeviceClass *dc = DEVICE_CLASS(oc);
 492
 493     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 494                                     &scc->parent_realize);
 495     dc->props = s390x_cpu_properties;
 496     dc->user_creatable = true;
 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->get_crash_info = s390_cpu_get_crash_info;
 512     cc->set_pc = s390_cpu_set_pc;
 513     cc->gdb_read_register = s390_cpu_gdb_read_register;
 514     cc->gdb_write_register = s390_cpu_gdb_write_register;
 515 #ifdef CONFIG_USER_ONLY
 516     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 517 #else
 518     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 519     cc->vmsd = &vmstate_s390_cpu;
 520     cc->write_elf64_note = s390_cpu_write_elf64_note;
 521 #ifdef CONFIG_TCG
 522     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 523     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 524     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 525 #endif
 526 #endif
 527     cc->disas_set_info = s390_cpu_disas_set_info;
 528 #ifdef CONFIG_TCG
 529     cc->tcg_initialize = s390x_translate_init;
 530 #endif
 531
 532     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 533     cc->gdb_core_xml_file = "s390x-core64.xml";
 534     cc->gdb_arch_name = s390_gdb_arch_name;
 535
 536     s390_cpu_model_class_register_props(oc);
 537 }
 538
 539 static const TypeInfo s390_cpu_type_info = {
 540     .name = TYPE_S390_CPU,
 541     .parent = TYPE_CPU,
 542     .instance_size = sizeof(S390CPU),
 543     .instance_init = s390_cpu_initfn,
 544     .instance_finalize = s390_cpu_finalize,
 545     .abstract = true,
 546     .class_size = sizeof(S390CPUClass),
 547     .class_init = s390_cpu_class_init,
 548 };
 549
 550 static void s390_cpu_register_types(void)
 551 {
 552     type_register_static(&s390_cpu_type_info);
 553 }
 554
 555 type_init(s390_cpu_register_types)