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
 222     /*
 223      * KVM requires the initial CPU reset ioctl to be executed on the target
 224      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 225      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 226      * the main thread is already running but the CPU hasn't been realized.
 227      */
 228     if (kvm_enabled()) {
 229         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 230     } else {
 231         cpu_reset(cs);
 232     }
 233
 234     scc->parent_realize(dev, &err);
 235 out:
 236     error_propagate(errp, err);
 237 }
 238
 239 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 240 {
 241     GuestPanicInformation *panic_info;
 242     S390CPU *cpu = S390_CPU(cs);
 243
 244     cpu_synchronize_state(cs);
 245     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 246
 247     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 248 #if !defined(CONFIG_USER_ONLY)
 249     panic_info->u.s390.core = cpu->env.core_id;
 250 #else
 251     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 252 #endif
 253     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 254     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 255     panic_info->u.s390.reason = cpu->env.crash_reason;
 256
 257     return panic_info;
 258 }
 259
 260 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 261                                         const char *name, void *opaque,
 262                                         Error **errp)
 263 {
 264     CPUState *cs = CPU(obj);
 265     GuestPanicInformation *panic_info;
 266
 267     if (!cs->crash_occurred) {
 268         error_setg(errp, "No crash occurred");
 269         return;
 270     }
 271
 272     panic_info = s390_cpu_get_crash_info(cs);
 273
 274     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 275                                      errp);
 276     qapi_free_GuestPanicInformation(panic_info);
 277 }
 278
 279 static void s390_cpu_initfn(Object *obj)
 280 {
 281     CPUState *cs = CPU(obj);
 282     S390CPU *cpu = S390_CPU(obj);
 283     CPUS390XState *env = &cpu->env;
 284
 285     cs->env_ptr = env;
 286     cs->halted = 1;
 287     cs->exception_index = EXCP_HLT;
 288     object_property_add(obj, "crash-information", "GuestPanicInformation",
 289                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 290     s390_cpu_model_register_props(obj);
 291 #if !defined(CONFIG_USER_ONLY)
 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)