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 "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_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 293     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 294     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 295 #endif
 296 }
 297
 298 static void s390_cpu_finalize(Object *obj)
 299 {
 300 #if !defined(CONFIG_USER_ONLY)
 301     S390CPU *cpu = S390_CPU(obj);
 302
 303     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 304     g_free(cpu->irqstate);
 305 #endif
 306 }
 307
 308 #if !defined(CONFIG_USER_ONLY)
 309 static bool disabled_wait(CPUState *cpu)
 310 {
 311     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 312                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 313 }
 314
 315 static unsigned s390_count_running_cpus(void)
 316 {
 317     CPUState *cpu;
 318     int nr_running = 0;
 319
 320     CPU_FOREACH(cpu) {
 321         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 322         if (state == S390_CPU_STATE_OPERATING ||
 323             state == S390_CPU_STATE_LOAD) {
 324             if (!disabled_wait(cpu)) {
 325                 nr_running++;
 326             }
 327         }
 328     }
 329
 330     return nr_running;
 331 }
 332
 333 unsigned int s390_cpu_halt(S390CPU *cpu)
 334 {
 335     CPUState *cs = CPU(cpu);
 336     trace_cpu_halt(cs->cpu_index);
 337
 338     if (!cs->halted) {
 339         cs->halted = 1;
 340         cs->exception_index = EXCP_HLT;
 341     }
 342
 343     return s390_count_running_cpus();
 344 }
 345
 346 void s390_cpu_unhalt(S390CPU *cpu)
 347 {
 348     CPUState *cs = CPU(cpu);
 349     trace_cpu_unhalt(cs->cpu_index);
 350
 351     if (cs->halted) {
 352         cs->halted = 0;
 353         cs->exception_index = -1;
 354     }
 355 }
 356
 357 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 358  {
 359     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 360
 361     switch (cpu_state) {
 362     case S390_CPU_STATE_STOPPED:
 363     case S390_CPU_STATE_CHECK_STOP:
 364         /* halt the cpu for common infrastructure */
 365         s390_cpu_halt(cpu);
 366         break;
 367     case S390_CPU_STATE_OPERATING:
 368     case S390_CPU_STATE_LOAD:
 369         /*
 370          * Starting a CPU with a PSW WAIT bit set:
 371          * KVM: handles this internally and triggers another WAIT exit.
 372          * TCG: will actually try to continue to run. Don't unhalt, will
 373          *      be done when the CPU actually has work (an interrupt).
 374          */
 375         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 376             s390_cpu_unhalt(cpu);
 377         }
 378         break;
 379     default:
 380         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 381                      cpu_state);
 382         exit(1);
 383     }
 384     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 385         kvm_s390_set_cpu_state(cpu, cpu_state);
 386     }
 387     cpu->env.cpu_state = cpu_state;
 388
 389     return s390_count_running_cpus();
 390 }
 391
 392 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 393 {
 394     if (kvm_enabled()) {
 395         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 396     }
 397     return 0;
 398 }
 399
 400 void s390_cmma_reset(void)
 401 {
 402     if (kvm_enabled()) {
 403         kvm_s390_cmma_reset();
 404     }
 405 }
 406
 407 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 408                                 int vq, bool assign)
 409 {
 410     if (kvm_enabled()) {
 411         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 412     } else {
 413         return 0;
 414     }
 415 }
 416
 417 void s390_crypto_reset(void)
 418 {
 419     if (kvm_enabled()) {
 420         kvm_s390_crypto_reset();
 421     }
 422 }
 423
 424 bool s390_get_squash_mcss(void)
 425 {
 426     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 427                                  NULL)) {
 428         return true;
 429     }
 430
 431     return false;
 432 }
 433
 434 void s390_enable_css_support(S390CPU *cpu)
 435 {
 436     if (kvm_enabled()) {
 437         kvm_s390_enable_css_support(cpu);
 438     }
 439 }
 440 #endif
 441
 442 static gchar *s390_gdb_arch_name(CPUState *cs)
 443 {
 444     return g_strdup("s390:64-bit");
 445 }
 446
 447 static Property s390x_cpu_properties[] = {
 448 #if !defined(CONFIG_USER_ONLY)
 449     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 450 #endif
 451     DEFINE_PROP_END_OF_LIST()
 452 };
 453
 454 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 455 {
 456     S390CPUClass *scc = S390_CPU_CLASS(oc);
 457     CPUClass *cc = CPU_CLASS(scc);
 458     DeviceClass *dc = DEVICE_CLASS(oc);
 459
 460     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 461                                     &scc->parent_realize);
 462     dc->props = s390x_cpu_properties;
 463     dc->user_creatable = true;
 464
 465     scc->parent_reset = cc->reset;
 466 #if !defined(CONFIG_USER_ONLY)
 467     scc->load_normal = s390_cpu_load_normal;
 468 #endif
 469     scc->cpu_reset = s390_cpu_reset;
 470     scc->initial_cpu_reset = s390_cpu_initial_reset;
 471     cc->reset = s390_cpu_full_reset;
 472     cc->class_by_name = s390_cpu_class_by_name,
 473     cc->has_work = s390_cpu_has_work;
 474 #ifdef CONFIG_TCG
 475     cc->do_interrupt = s390_cpu_do_interrupt;
 476 #endif
 477     cc->dump_state = s390_cpu_dump_state;
 478     cc->get_crash_info = s390_cpu_get_crash_info;
 479     cc->set_pc = s390_cpu_set_pc;
 480     cc->gdb_read_register = s390_cpu_gdb_read_register;
 481     cc->gdb_write_register = s390_cpu_gdb_write_register;
 482 #ifdef CONFIG_USER_ONLY
 483     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 484 #else
 485     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 486     cc->vmsd = &vmstate_s390_cpu;
 487     cc->write_elf64_note = s390_cpu_write_elf64_note;
 488 #ifdef CONFIG_TCG
 489     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 490     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 491     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 492 #endif
 493 #endif
 494     cc->disas_set_info = s390_cpu_disas_set_info;
 495 #ifdef CONFIG_TCG
 496     cc->tcg_initialize = s390x_translate_init;
 497 #endif
 498
 499     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 500     cc->gdb_core_xml_file = "s390x-core64.xml";
 501     cc->gdb_arch_name = s390_gdb_arch_name;
 502
 503     s390_cpu_model_class_register_props(oc);
 504 }
 505
 506 static const TypeInfo s390_cpu_type_info = {
 507     .name = TYPE_S390_CPU,
 508     .parent = TYPE_CPU,
 509     .instance_size = sizeof(S390CPU),
 510     .instance_init = s390_cpu_initfn,
 511     .instance_finalize = s390_cpu_finalize,
 512     .abstract = true,
 513     .class_size = sizeof(S390CPUClass),
 514     .class_init = s390_cpu_class_init,
 515 };
 516
 517 static void s390_cpu_register_types(void)
 518 {
 519     type_register_static(&s390_cpu_type_info);
 520 }
 521
 522 type_init(s390_cpu_register_types)