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/timer.h"
  34 #include "qemu/error-report.h"
  35 #include "trace.h"
  36 #include "qapi/visitor.h"
  37 #include "qapi/qapi-visit-misc.h"
  38 #include "qapi/qapi-visit-run-state.h"
  39 #include "sysemu/hw_accel.h"
  40 #include "hw/qdev-properties.h"
  41 #ifndef CONFIG_USER_ONLY
  42 #include "hw/hw.h"
  43 #include "sysemu/arch_init.h"
  44 #include "sysemu/sysemu.h"
  45 #endif
  46 #include "fpu/softfloat.h"
  47
  48 #define CR0_RESET       0xE0UL
  49 #define CR14_RESET      0xC2000000UL;
  50
  51 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  52 {
  53     S390CPU *cpu = S390_CPU(cs);
  54
  55     cpu->env.psw.addr = value;
  56 }
  57
  58 static bool s390_cpu_has_work(CPUState *cs)
  59 {
  60     S390CPU *cpu = S390_CPU(cs);
  61
  62     /* STOPPED cpus can never wake up */
  63     if (s390_cpu_get_state(cpu) != S390_CPU_STATE_LOAD &&
  64         s390_cpu_get_state(cpu) != S390_CPU_STATE_OPERATING) {
  65         return false;
  66     }
  67
  68     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
  69         return false;
  70     }
  71
  72     return s390_cpu_has_int(cpu);
  73 }
  74
  75 #if !defined(CONFIG_USER_ONLY)
  76 /* S390CPUClass::load_normal() */
  77 static void s390_cpu_load_normal(CPUState *s)
  78 {
  79     S390CPU *cpu = S390_CPU(s);
  80     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  81     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  82     s390_cpu_set_state(S390_CPU_STATE_OPERATING, cpu);
  83 }
  84 #endif
  85
  86 /* S390CPUClass::cpu_reset() */
  87 static void s390_cpu_reset(CPUState *s)
  88 {
  89     S390CPU *cpu = S390_CPU(s);
  90     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  91     CPUS390XState *env = &cpu->env;
  92
  93     env->pfault_token = -1UL;
  94     env->bpbc = false;
  95     scc->parent_reset(s);
  96     cpu->env.sigp_order = 0;
  97     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
  98 }
  99
 100 /* S390CPUClass::initial_reset() */
 101 static void s390_cpu_initial_reset(CPUState *s)
 102 {
 103     S390CPU *cpu = S390_CPU(s);
 104     CPUS390XState *env = &cpu->env;
 105
 106     s390_cpu_reset(s);
 107     /* initial reset does not clear everything! */
 108     memset(&env->start_initial_reset_fields, 0,
 109         offsetof(CPUS390XState, end_reset_fields) -
 110         offsetof(CPUS390XState, start_initial_reset_fields));
 111
 112     /* architectured initial values for CR 0 and 14 */
 113     env->cregs[0] = CR0_RESET;
 114     env->cregs[14] = CR14_RESET;
 115
 116     /* architectured initial value for Breaking-Event-Address register */
 117     env->gbea = 1;
 118
 119     env->pfault_token = -1UL;
 120
 121     /* tininess for underflow is detected before rounding */
 122     set_float_detect_tininess(float_tininess_before_rounding,
 123                               &env->fpu_status);
 124
 125     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 126     if (kvm_enabled()) {
 127         kvm_s390_reset_vcpu(cpu);
 128     }
 129 }
 130
 131 /* CPUClass:reset() */
 132 static void s390_cpu_full_reset(CPUState *s)
 133 {
 134     S390CPU *cpu = S390_CPU(s);
 135     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 136     CPUS390XState *env = &cpu->env;
 137
 138     scc->parent_reset(s);
 139     cpu->env.sigp_order = 0;
 140     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 141
 142     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 143
 144     /* architectured initial values for CR 0 and 14 */
 145     env->cregs[0] = CR0_RESET;
 146     env->cregs[14] = CR14_RESET;
 147
 148     /* architectured initial value for Breaking-Event-Address register */
 149     env->gbea = 1;
 150
 151     env->pfault_token = -1UL;
 152
 153     /* tininess for underflow is detected before rounding */
 154     set_float_detect_tininess(float_tininess_before_rounding,
 155                               &env->fpu_status);
 156
 157     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 158     if (kvm_enabled()) {
 159         kvm_s390_reset_vcpu(cpu);
 160     }
 161 }
 162
 163 #if !defined(CONFIG_USER_ONLY)
 164 static void s390_cpu_machine_reset_cb(void *opaque)
 165 {
 166     S390CPU *cpu = opaque;
 167
 168     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 169 }
 170 #endif
 171
 172 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 173 {
 174     info->mach = bfd_mach_s390_64;
 175     info->print_insn = print_insn_s390;
 176 }
 177
 178 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 179 {
 180     CPUState *cs = CPU(dev);
 181     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 182 #if !defined(CONFIG_USER_ONLY)
 183     S390CPU *cpu = S390_CPU(dev);
 184 #endif
 185     Error *err = NULL;
 186
 187     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 188     s390_realize_cpu_model(cs, &err);
 189     if (err) {
 190         goto out;
 191     }
 192
 193 #if !defined(CONFIG_USER_ONLY)
 194     if (cpu->env.core_id >= max_cpus) {
 195         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 196                    ", maximum core-id: %d", cpu->env.core_id,
 197                    max_cpus - 1);
 198         goto out;
 199     }
 200
 201     if (cpu_exists(cpu->env.core_id)) {
 202         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 203                    ", it already exists", cpu->env.core_id);
 204         goto out;
 205     }
 206
 207     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 208     cs->cpu_index = cpu->env.core_id;
 209 #endif
 210
 211     cpu_exec_realizefn(cs, &err);
 212     if (err != NULL) {
 213         goto out;
 214     }
 215
 216 #if !defined(CONFIG_USER_ONLY)
 217     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 218 #endif
 219     s390_cpu_gdb_init(cs);
 220     qemu_init_vcpu(cs);
 221 #if !defined(CONFIG_USER_ONLY)
 222     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 223 #else
 224     cpu_reset(cs);
 225 #endif
 226
 227     scc->parent_realize(dev, &err);
 228 out:
 229     error_propagate(errp, err);
 230 }
 231
 232 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 233 {
 234     GuestPanicInformation *panic_info;
 235     S390CPU *cpu = S390_CPU(cs);
 236
 237     cpu_synchronize_state(cs);
 238     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 239
 240     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 241 #if !defined(CONFIG_USER_ONLY)
 242     panic_info->u.s390.core = cpu->env.core_id;
 243 #else
 244     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 245 #endif
 246     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 247     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 248     panic_info->u.s390.reason = cpu->env.crash_reason;
 249
 250     return panic_info;
 251 }
 252
 253 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 254                                         const char *name, void *opaque,
 255                                         Error **errp)
 256 {
 257     CPUState *cs = CPU(obj);
 258     GuestPanicInformation *panic_info;
 259
 260     if (!cs->crash_occurred) {
 261         error_setg(errp, "No crash occurred");
 262         return;
 263     }
 264
 265     panic_info = s390_cpu_get_crash_info(cs);
 266
 267     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 268                                      errp);
 269     qapi_free_GuestPanicInformation(panic_info);
 270 }
 271
 272 static void s390_cpu_initfn(Object *obj)
 273 {
 274     CPUState *cs = CPU(obj);
 275     S390CPU *cpu = S390_CPU(obj);
 276     CPUS390XState *env = &cpu->env;
 277
 278     cs->env_ptr = env;
 279     cs->halted = 1;
 280     cs->exception_index = EXCP_HLT;
 281     object_property_add(obj, "crash-information", "GuestPanicInformation",
 282                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 283     s390_cpu_model_register_props(obj);
 284 #if !defined(CONFIG_USER_ONLY)
 285     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 286     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 287     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 288 #endif
 289 }
 290
 291 static void s390_cpu_finalize(Object *obj)
 292 {
 293 #if !defined(CONFIG_USER_ONLY)
 294     S390CPU *cpu = S390_CPU(obj);
 295
 296     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 297     g_free(cpu->irqstate);
 298 #endif
 299 }
 300
 301 #if !defined(CONFIG_USER_ONLY)
 302 static bool disabled_wait(CPUState *cpu)
 303 {
 304     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 305                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 306 }
 307
 308 static unsigned s390_count_running_cpus(void)
 309 {
 310     CPUState *cpu;
 311     int nr_running = 0;
 312
 313     CPU_FOREACH(cpu) {
 314         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 315         if (state == S390_CPU_STATE_OPERATING ||
 316             state == S390_CPU_STATE_LOAD) {
 317             if (!disabled_wait(cpu)) {
 318                 nr_running++;
 319             }
 320         }
 321     }
 322
 323     return nr_running;
 324 }
 325
 326 unsigned int s390_cpu_halt(S390CPU *cpu)
 327 {
 328     CPUState *cs = CPU(cpu);
 329     trace_cpu_halt(cs->cpu_index);
 330
 331     if (!cs->halted) {
 332         cs->halted = 1;
 333         cs->exception_index = EXCP_HLT;
 334     }
 335
 336     return s390_count_running_cpus();
 337 }
 338
 339 void s390_cpu_unhalt(S390CPU *cpu)
 340 {
 341     CPUState *cs = CPU(cpu);
 342     trace_cpu_unhalt(cs->cpu_index);
 343
 344     if (cs->halted) {
 345         cs->halted = 0;
 346         cs->exception_index = -1;
 347     }
 348 }
 349
 350 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 351  {
 352     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 353
 354     switch (cpu_state) {
 355     case S390_CPU_STATE_STOPPED:
 356     case S390_CPU_STATE_CHECK_STOP:
 357         /* halt the cpu for common infrastructure */
 358         s390_cpu_halt(cpu);
 359         break;
 360     case S390_CPU_STATE_OPERATING:
 361     case S390_CPU_STATE_LOAD:
 362         /*
 363          * Starting a CPU with a PSW WAIT bit set:
 364          * KVM: handles this internally and triggers another WAIT exit.
 365          * TCG: will actually try to continue to run. Don't unhalt, will
 366          *      be done when the CPU actually has work (an interrupt).
 367          */
 368         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 369             s390_cpu_unhalt(cpu);
 370         }
 371         break;
 372     default:
 373         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 374                      cpu_state);
 375         exit(1);
 376     }
 377     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 378         kvm_s390_set_cpu_state(cpu, cpu_state);
 379     }
 380     cpu->env.cpu_state = cpu_state;
 381
 382     return s390_count_running_cpus();
 383 }
 384
 385 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 386 {
 387     if (kvm_enabled()) {
 388         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 389     }
 390     return 0;
 391 }
 392
 393 void s390_cmma_reset(void)
 394 {
 395     if (kvm_enabled()) {
 396         kvm_s390_cmma_reset();
 397     }
 398 }
 399
 400 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 401                                 int vq, bool assign)
 402 {
 403     if (kvm_enabled()) {
 404         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 405     } else {
 406         return 0;
 407     }
 408 }
 409
 410 void s390_crypto_reset(void)
 411 {
 412     if (kvm_enabled()) {
 413         kvm_s390_crypto_reset();
 414     }
 415 }
 416
 417 bool s390_get_squash_mcss(void)
 418 {
 419     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 420                                  NULL)) {
 421         return true;
 422     }
 423
 424     return false;
 425 }
 426
 427 void s390_enable_css_support(S390CPU *cpu)
 428 {
 429     if (kvm_enabled()) {
 430         kvm_s390_enable_css_support(cpu);
 431     }
 432 }
 433 #endif
 434
 435 static gchar *s390_gdb_arch_name(CPUState *cs)
 436 {
 437     return g_strdup("s390:64-bit");
 438 }
 439
 440 static Property s390x_cpu_properties[] = {
 441 #if !defined(CONFIG_USER_ONLY)
 442     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 443 #endif
 444     DEFINE_PROP_END_OF_LIST()
 445 };
 446
 447 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 448 {
 449     S390CPUClass *scc = S390_CPU_CLASS(oc);
 450     CPUClass *cc = CPU_CLASS(scc);
 451     DeviceClass *dc = DEVICE_CLASS(oc);
 452
 453     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 454                                     &scc->parent_realize);
 455     dc->props = s390x_cpu_properties;
 456     dc->user_creatable = true;
 457
 458     scc->parent_reset = cc->reset;
 459 #if !defined(CONFIG_USER_ONLY)
 460     scc->load_normal = s390_cpu_load_normal;
 461 #endif
 462     scc->cpu_reset = s390_cpu_reset;
 463     scc->initial_cpu_reset = s390_cpu_initial_reset;
 464     cc->reset = s390_cpu_full_reset;
 465     cc->class_by_name = s390_cpu_class_by_name,
 466     cc->has_work = s390_cpu_has_work;
 467 #ifdef CONFIG_TCG
 468     cc->do_interrupt = s390_cpu_do_interrupt;
 469 #endif
 470     cc->dump_state = s390_cpu_dump_state;
 471     cc->get_crash_info = s390_cpu_get_crash_info;
 472     cc->set_pc = s390_cpu_set_pc;
 473     cc->gdb_read_register = s390_cpu_gdb_read_register;
 474     cc->gdb_write_register = s390_cpu_gdb_write_register;
 475 #ifdef CONFIG_USER_ONLY
 476     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 477 #else
 478     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 479     cc->vmsd = &vmstate_s390_cpu;
 480     cc->write_elf64_note = s390_cpu_write_elf64_note;
 481 #ifdef CONFIG_TCG
 482     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 483     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 484     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 485 #endif
 486 #endif
 487     cc->disas_set_info = s390_cpu_disas_set_info;
 488 #ifdef CONFIG_TCG
 489     cc->tcg_initialize = s390x_translate_init;
 490 #endif
 491
 492     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 493     cc->gdb_core_xml_file = "s390x-core64.xml";
 494     cc->gdb_arch_name = s390_gdb_arch_name;
 495
 496     s390_cpu_model_class_register_props(oc);
 497 }
 498
 499 static const TypeInfo s390_cpu_type_info = {
 500     .name = TYPE_S390_CPU,
 501     .parent = TYPE_CPU,
 502     .instance_size = sizeof(S390CPU),
 503     .instance_init = s390_cpu_initfn,
 504     .instance_finalize = s390_cpu_finalize,
 505     .abstract = true,
 506     .class_size = sizeof(S390CPUClass),
 507     .class_init = s390_cpu_class_init,
 508 };
 509
 510 static void s390_cpu_register_types(void)
 511 {
 512     type_register_static(&s390_cpu_type_info);
 513 }
 514
 515 type_init(s390_cpu_register_types)