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 program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program 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  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23 #include "qemu/osdep.h"
  24 #include "qapi/error.h"
  25 #include "cpu.h"
  26 #include "internal.h"
  27 #include "kvm_s390x.h"
  28 #include "sysemu/kvm.h"
  29 #include "sysemu/reset.h"
  30 #include "qemu/timer.h"
  31 #include "qemu/error-report.h"
  32 #include "qemu/module.h"
  33 #include "trace.h"
  34 #include "qapi/visitor.h"
  35 #include "qapi/qapi-types-machine.h"
  36 #include "qapi/qapi-visit-run-state.h"
  37 #include "sysemu/hw_accel.h"
  38 #include "hw/qdev-properties.h"
  39 #ifndef CONFIG_USER_ONLY
  40 #include "hw/hw.h"
  41 #include "hw/boards.h"
  42 #include "sysemu/arch_init.h"
  43 #include "sysemu/sysemu.h"
  44 #include "sysemu/tcg.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 #if defined(CONFIG_USER_ONLY)
 149     /* user mode should always be allowed to use the full FPU */
 150     env->cregs[0] |= CR0_AFP;
 151     if (s390_has_feat(S390_FEAT_VECTOR)) {
 152         env->cregs[0] |= CR0_VECTOR;
 153     }
 154 #endif
 155
 156     /* architectured initial value for Breaking-Event-Address register */
 157     env->gbea = 1;
 158
 159     env->pfault_token = -1UL;
 160
 161     /* tininess for underflow is detected before rounding */
 162     set_float_detect_tininess(float_tininess_before_rounding,
 163                               &env->fpu_status);
 164
 165     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 166     if (kvm_enabled()) {
 167         kvm_s390_reset_vcpu(cpu);
 168     }
 169 }
 170
 171 #if !defined(CONFIG_USER_ONLY)
 172 static void s390_cpu_machine_reset_cb(void *opaque)
 173 {
 174     S390CPU *cpu = opaque;
 175
 176     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 177 }
 178 #endif
 179
 180 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 181 {
 182     info->mach = bfd_mach_s390_64;
 183     info->print_insn = print_insn_s390;
 184 }
 185
 186 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 187 {
 188     CPUState *cs = CPU(dev);
 189     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 190 #if !defined(CONFIG_USER_ONLY)
 191     S390CPU *cpu = S390_CPU(dev);
 192 #endif
 193     Error *err = NULL;
 194
 195     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 196     s390_realize_cpu_model(cs, &err);
 197     if (err) {
 198         goto out;
 199     }
 200
 201 #if !defined(CONFIG_USER_ONLY)
 202     MachineState *ms = MACHINE(qdev_get_machine());
 203     unsigned int max_cpus = ms->smp.max_cpus;
 204     if (cpu->env.core_id >= max_cpus) {
 205         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 206                    ", maximum core-id: %d", cpu->env.core_id,
 207                    max_cpus - 1);
 208         goto out;
 209     }
 210
 211     if (cpu_exists(cpu->env.core_id)) {
 212         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 213                    ", it already exists", cpu->env.core_id);
 214         goto out;
 215     }
 216
 217     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 218     cs->cpu_index = cpu->env.core_id;
 219 #endif
 220
 221     cpu_exec_realizefn(cs, &err);
 222     if (err != NULL) {
 223         goto out;
 224     }
 225
 226 #if !defined(CONFIG_USER_ONLY)
 227     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 228 #endif
 229     s390_cpu_gdb_init(cs);
 230     qemu_init_vcpu(cs);
 231
 232     /*
 233      * KVM requires the initial CPU reset ioctl to be executed on the target
 234      * CPU thread. CPU hotplug under single-threaded TCG will not work with
 235      * run_on_cpu(), as run_on_cpu() will not work properly if called while
 236      * the main thread is already running but the CPU hasn't been realized.
 237      */
 238     if (kvm_enabled()) {
 239         run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 240     } else {
 241         cpu_reset(cs);
 242     }
 243
 244     scc->parent_realize(dev, &err);
 245 out:
 246     error_propagate(errp, err);
 247 }
 248
 249 static GuestPanicInformation *s390_cpu_get_crash_info(CPUState *cs)
 250 {
 251     GuestPanicInformation *panic_info;
 252     S390CPU *cpu = S390_CPU(cs);
 253
 254     cpu_synchronize_state(cs);
 255     panic_info = g_malloc0(sizeof(GuestPanicInformation));
 256
 257     panic_info->type = GUEST_PANIC_INFORMATION_TYPE_S390;
 258 #if !defined(CONFIG_USER_ONLY)
 259     panic_info->u.s390.core = cpu->env.core_id;
 260 #else
 261     panic_info->u.s390.core = 0; /* sane default for non system emulation */
 262 #endif
 263     panic_info->u.s390.psw_mask = cpu->env.psw.mask;
 264     panic_info->u.s390.psw_addr = cpu->env.psw.addr;
 265     panic_info->u.s390.reason = cpu->env.crash_reason;
 266
 267     return panic_info;
 268 }
 269
 270 static void s390_cpu_get_crash_info_qom(Object *obj, Visitor *v,
 271                                         const char *name, void *opaque,
 272                                         Error **errp)
 273 {
 274     CPUState *cs = CPU(obj);
 275     GuestPanicInformation *panic_info;
 276
 277     if (!cs->crash_occurred) {
 278         error_setg(errp, "No crash occurred");
 279         return;
 280     }
 281
 282     panic_info = s390_cpu_get_crash_info(cs);
 283
 284     visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
 285                                      errp);
 286     qapi_free_GuestPanicInformation(panic_info);
 287 }
 288
 289 static void s390_cpu_initfn(Object *obj)
 290 {
 291     CPUState *cs = CPU(obj);
 292     S390CPU *cpu = S390_CPU(obj);
 293
 294     cpu_set_cpustate_pointers(cpu);
 295     cs->halted = 1;
 296     cs->exception_index = EXCP_HLT;
 297     object_property_add(obj, "crash-information", "GuestPanicInformation",
 298                         s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
 299     s390_cpu_model_register_props(obj);
 300 #if !defined(CONFIG_USER_ONLY)
 301     cpu->env.tod_timer =
 302         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 303     cpu->env.cpu_timer =
 304         timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 305     s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
 306 #endif
 307 }
 308
 309 static void s390_cpu_finalize(Object *obj)
 310 {
 311 #if !defined(CONFIG_USER_ONLY)
 312     S390CPU *cpu = S390_CPU(obj);
 313
 314     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 315     g_free(cpu->irqstate);
 316 #endif
 317 }
 318
 319 #if !defined(CONFIG_USER_ONLY)
 320 static bool disabled_wait(CPUState *cpu)
 321 {
 322     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 323                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 324 }
 325
 326 static unsigned s390_count_running_cpus(void)
 327 {
 328     CPUState *cpu;
 329     int nr_running = 0;
 330
 331     CPU_FOREACH(cpu) {
 332         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 333         if (state == S390_CPU_STATE_OPERATING ||
 334             state == S390_CPU_STATE_LOAD) {
 335             if (!disabled_wait(cpu)) {
 336                 nr_running++;
 337             }
 338         }
 339     }
 340
 341     return nr_running;
 342 }
 343
 344 unsigned int s390_cpu_halt(S390CPU *cpu)
 345 {
 346     CPUState *cs = CPU(cpu);
 347     trace_cpu_halt(cs->cpu_index);
 348
 349     if (!cs->halted) {
 350         cs->halted = 1;
 351         cs->exception_index = EXCP_HLT;
 352     }
 353
 354     return s390_count_running_cpus();
 355 }
 356
 357 void s390_cpu_unhalt(S390CPU *cpu)
 358 {
 359     CPUState *cs = CPU(cpu);
 360     trace_cpu_unhalt(cs->cpu_index);
 361
 362     if (cs->halted) {
 363         cs->halted = 0;
 364         cs->exception_index = -1;
 365     }
 366 }
 367
 368 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 369  {
 370     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 371
 372     switch (cpu_state) {
 373     case S390_CPU_STATE_STOPPED:
 374     case S390_CPU_STATE_CHECK_STOP:
 375         /* halt the cpu for common infrastructure */
 376         s390_cpu_halt(cpu);
 377         break;
 378     case S390_CPU_STATE_OPERATING:
 379     case S390_CPU_STATE_LOAD:
 380         /*
 381          * Starting a CPU with a PSW WAIT bit set:
 382          * KVM: handles this internally and triggers another WAIT exit.
 383          * TCG: will actually try to continue to run. Don't unhalt, will
 384          *      be done when the CPU actually has work (an interrupt).
 385          */
 386         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 387             s390_cpu_unhalt(cpu);
 388         }
 389         break;
 390     default:
 391         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 392                      cpu_state);
 393         exit(1);
 394     }
 395     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 396         kvm_s390_set_cpu_state(cpu, cpu_state);
 397     }
 398     cpu->env.cpu_state = cpu_state;
 399
 400     return s390_count_running_cpus();
 401 }
 402
 403 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 404 {
 405     if (kvm_enabled()) {
 406         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 407     }
 408     return 0;
 409 }
 410
 411 void s390_set_max_pagesize(uint64_t pagesize, Error **errp)
 412 {
 413     if (kvm_enabled()) {
 414         kvm_s390_set_max_pagesize(pagesize, errp);
 415     }
 416 }
 417
 418 void s390_cmma_reset(void)
 419 {
 420     if (kvm_enabled()) {
 421         kvm_s390_cmma_reset();
 422     }
 423 }
 424
 425 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 426                                 int vq, bool assign)
 427 {
 428     if (kvm_enabled()) {
 429         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 430     } else {
 431         return 0;
 432     }
 433 }
 434
 435 void s390_crypto_reset(void)
 436 {
 437     if (kvm_enabled()) {
 438         kvm_s390_crypto_reset();
 439     }
 440 }
 441
 442 void s390_enable_css_support(S390CPU *cpu)
 443 {
 444     if (kvm_enabled()) {
 445         kvm_s390_enable_css_support(cpu);
 446     }
 447 }
 448 #endif
 449
 450 static gchar *s390_gdb_arch_name(CPUState *cs)
 451 {
 452     return g_strdup("s390:64-bit");
 453 }
 454
 455 static Property s390x_cpu_properties[] = {
 456 #if !defined(CONFIG_USER_ONLY)
 457     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 458 #endif
 459     DEFINE_PROP_END_OF_LIST()
 460 };
 461
 462 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 463 {
 464     S390CPUClass *scc = S390_CPU_CLASS(oc);
 465     CPUClass *cc = CPU_CLASS(scc);
 466     DeviceClass *dc = DEVICE_CLASS(oc);
 467
 468     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 469                                     &scc->parent_realize);
 470     dc->props = s390x_cpu_properties;
 471     dc->user_creatable = true;
 472
 473     scc->parent_reset = cc->reset;
 474 #if !defined(CONFIG_USER_ONLY)
 475     scc->load_normal = s390_cpu_load_normal;
 476 #endif
 477     scc->cpu_reset = s390_cpu_reset;
 478     scc->initial_cpu_reset = s390_cpu_initial_reset;
 479     cc->reset = s390_cpu_full_reset;
 480     cc->class_by_name = s390_cpu_class_by_name,
 481     cc->has_work = s390_cpu_has_work;
 482 #ifdef CONFIG_TCG
 483     cc->do_interrupt = s390_cpu_do_interrupt;
 484 #endif
 485     cc->dump_state = s390_cpu_dump_state;
 486     cc->get_crash_info = s390_cpu_get_crash_info;
 487     cc->set_pc = s390_cpu_set_pc;
 488     cc->gdb_read_register = s390_cpu_gdb_read_register;
 489     cc->gdb_write_register = s390_cpu_gdb_write_register;
 490 #ifndef CONFIG_USER_ONLY
 491     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 492     cc->vmsd = &vmstate_s390_cpu;
 493     cc->write_elf64_note = s390_cpu_write_elf64_note;
 494 #ifdef CONFIG_TCG
 495     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 496     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 497     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 498 #endif
 499 #endif
 500     cc->disas_set_info = s390_cpu_disas_set_info;
 501 #ifdef CONFIG_TCG
 502     cc->tcg_initialize = s390x_translate_init;
 503     cc->tlb_fill = s390_cpu_tlb_fill;
 504 #endif
 505
 506     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 507     cc->gdb_core_xml_file = "s390x-core64.xml";
 508     cc->gdb_arch_name = s390_gdb_arch_name;
 509
 510     s390_cpu_model_class_register_props(oc);
 511 }
 512
 513 static const TypeInfo s390_cpu_type_info = {
 514     .name = TYPE_S390_CPU,
 515     .parent = TYPE_CPU,
 516     .instance_size = sizeof(S390CPU),
 517     .instance_init = s390_cpu_initfn,
 518     .instance_finalize = s390_cpu_finalize,
 519     .abstract = true,
 520     .class_size = sizeof(S390CPUClass),
 521     .class_init = s390_cpu_class_init,
 522 };
 523
 524 static void s390_cpu_register_types(void)
 525 {
 526     type_register_static(&s390_cpu_type_info);
 527 }
 528
 529 type_init(s390_cpu_register_types)