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 "exec/exec-all.h"
  39 #include "hw/qdev-properties.h"
  40 #ifndef CONFIG_USER_ONLY
  41 #include "hw/hw.h"
  42 #include "sysemu/arch_init.h"
  43 #include "sysemu/sysemu.h"
  44 #include "hw/s390x/sclp.h"
  45 #endif
  46
  47 #define CR0_RESET       0xE0UL
  48 #define CR14_RESET      0xC2000000UL;
  49
  50 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  51 {
  52     S390CPU *cpu = S390_CPU(cs);
  53
  54     cpu->env.psw.addr = value;
  55 }
  56
  57 static bool s390_cpu_has_work(CPUState *cs)
  58 {
  59     S390CPU *cpu = S390_CPU(cs);
  60     CPUS390XState *env = &cpu->env;
  61
  62     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  63            (env->psw.mask & PSW_MASK_EXT);
  64 }
  65
  66 #if !defined(CONFIG_USER_ONLY)
  67 /* S390CPUClass::load_normal() */
  68 static void s390_cpu_load_normal(CPUState *s)
  69 {
  70     S390CPU *cpu = S390_CPU(s);
  71     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  72     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  73     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  74 }
  75 #endif
  76
  77 /* S390CPUClass::cpu_reset() */
  78 static void s390_cpu_reset(CPUState *s)
  79 {
  80     S390CPU *cpu = S390_CPU(s);
  81     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  82     CPUS390XState *env = &cpu->env;
  83
  84     env->pfault_token = -1UL;
  85     scc->parent_reset(s);
  86     cpu->env.sigp_order = 0;
  87     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
  88 }
  89
  90 /* S390CPUClass::initial_reset() */
  91 static void s390_cpu_initial_reset(CPUState *s)
  92 {
  93     S390CPU *cpu = S390_CPU(s);
  94     CPUS390XState *env = &cpu->env;
  95     int i;
  96
  97     s390_cpu_reset(s);
  98     /* initial reset does not clear everything! */
  99     memset(&env->start_initial_reset_fields, 0,
 100         offsetof(CPUS390XState, end_reset_fields) -
 101         offsetof(CPUS390XState, start_initial_reset_fields));
 102
 103     /* architectured initial values for CR 0 and 14 */
 104     env->cregs[0] = CR0_RESET;
 105     env->cregs[14] = CR14_RESET;
 106
 107     /* architectured initial value for Breaking-Event-Address register */
 108     env->gbea = 1;
 109
 110     env->pfault_token = -1UL;
 111     env->ext_index = -1;
 112     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 113         env->io_index[i] = -1;
 114     }
 115
 116     /* tininess for underflow is detected before rounding */
 117     set_float_detect_tininess(float_tininess_before_rounding,
 118                               &env->fpu_status);
 119
 120     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 121     if (kvm_enabled()) {
 122         kvm_s390_reset_vcpu(cpu);
 123     }
 124 }
 125
 126 /* CPUClass:reset() */
 127 static void s390_cpu_full_reset(CPUState *s)
 128 {
 129     S390CPU *cpu = S390_CPU(s);
 130     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 131     CPUS390XState *env = &cpu->env;
 132     int i;
 133
 134     scc->parent_reset(s);
 135     cpu->env.sigp_order = 0;
 136     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 137
 138     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 139
 140     /* architectured initial values for CR 0 and 14 */
 141     env->cregs[0] = CR0_RESET;
 142     env->cregs[14] = CR14_RESET;
 143
 144     /* architectured initial value for Breaking-Event-Address register */
 145     env->gbea = 1;
 146
 147     env->pfault_token = -1UL;
 148     env->ext_index = -1;
 149     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 150         env->io_index[i] = -1;
 151     }
 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     S390CPU *cpu = S390_CPU(dev);
 183     CPUS390XState *env = &cpu->env;
 184     Error *err = NULL;
 185
 186     /* the model has to be realized before qemu_init_vcpu() due to kvm */
 187     s390_realize_cpu_model(cs, &err);
 188     if (err) {
 189         goto out;
 190     }
 191
 192 #if !defined(CONFIG_USER_ONLY)
 193     if (cpu->env.core_id >= max_cpus) {
 194         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 195                    ", maximum core-id: %d", cpu->env.core_id,
 196                    max_cpus - 1);
 197         goto out;
 198     }
 199 #else
 200     /* implicitly set for linux-user only */
 201     cpu->env.core_id = scc->next_core_id;
 202     scc->next_core_id++;
 203 #endif
 204
 205     if (cpu_exists(cpu->env.core_id)) {
 206         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 207                    ", it already exists", cpu->env.core_id);
 208         goto out;
 209     }
 210
 211     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 212     cs->cpu_index = env->core_id;
 213     cpu_exec_realizefn(cs, &err);
 214     if (err != NULL) {
 215         goto out;
 216     }
 217
 218 #if !defined(CONFIG_USER_ONLY)
 219     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 220 #endif
 221     s390_cpu_gdb_init(cs);
 222     qemu_init_vcpu(cs);
 223 #if !defined(CONFIG_USER_ONLY)
 224     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 225 #else
 226     cpu_reset(cs);
 227 #endif
 228
 229     scc->parent_realize(dev, &err);
 230
 231 #if !defined(CONFIG_USER_ONLY)
 232     if (dev->hotplugged) {
 233         raise_irq_cpu_hotplug();
 234     }
 235 #endif
 236
 237 out:
 238     error_propagate(errp, err);
 239 }
 240
 241 static void s390_cpu_initfn(Object *obj)
 242 {
 243     CPUState *cs = CPU(obj);
 244     S390CPU *cpu = S390_CPU(obj);
 245     CPUS390XState *env = &cpu->env;
 246     static bool inited;
 247 #if !defined(CONFIG_USER_ONLY)
 248     struct tm tm;
 249 #endif
 250
 251     cs->env_ptr = env;
 252     cs->halted = 1;
 253     cs->exception_index = EXCP_HLT;
 254     s390_cpu_model_register_props(obj);
 255 #if !defined(CONFIG_USER_ONLY)
 256     qemu_get_timedate(&tm, 0);
 257     env->tod_offset = TOD_UNIX_EPOCH +
 258                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 259     env->tod_basetime = 0;
 260     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 261     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 262     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 263 #endif
 264
 265     if (tcg_enabled() && !inited) {
 266         inited = true;
 267         s390x_translate_init();
 268     }
 269 }
 270
 271 static void s390_cpu_finalize(Object *obj)
 272 {
 273 #if !defined(CONFIG_USER_ONLY)
 274     S390CPU *cpu = S390_CPU(obj);
 275
 276     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 277     g_free(cpu->irqstate);
 278 #endif
 279 }
 280
 281 #if !defined(CONFIG_USER_ONLY)
 282 static bool disabled_wait(CPUState *cpu)
 283 {
 284     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 285                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 286 }
 287
 288 static unsigned s390_count_running_cpus(void)
 289 {
 290     CPUState *cpu;
 291     int nr_running = 0;
 292
 293     CPU_FOREACH(cpu) {
 294         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 295         if (state == CPU_STATE_OPERATING ||
 296             state == CPU_STATE_LOAD) {
 297             if (!disabled_wait(cpu)) {
 298                 nr_running++;
 299             }
 300         }
 301     }
 302
 303     return nr_running;
 304 }
 305
 306 unsigned int s390_cpu_halt(S390CPU *cpu)
 307 {
 308     CPUState *cs = CPU(cpu);
 309     trace_cpu_halt(cs->cpu_index);
 310
 311     if (!cs->halted) {
 312         cs->halted = 1;
 313         cs->exception_index = EXCP_HLT;
 314     }
 315
 316     return s390_count_running_cpus();
 317 }
 318
 319 void s390_cpu_unhalt(S390CPU *cpu)
 320 {
 321     CPUState *cs = CPU(cpu);
 322     trace_cpu_unhalt(cs->cpu_index);
 323
 324     if (cs->halted) {
 325         cs->halted = 0;
 326         cs->exception_index = -1;
 327     }
 328 }
 329
 330 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 331  {
 332     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 333
 334     switch (cpu_state) {
 335     case CPU_STATE_STOPPED:
 336     case CPU_STATE_CHECK_STOP:
 337         /* halt the cpu for common infrastructure */
 338         s390_cpu_halt(cpu);
 339         break;
 340     case CPU_STATE_OPERATING:
 341     case CPU_STATE_LOAD:
 342         /* unhalt the cpu for common infrastructure */
 343         s390_cpu_unhalt(cpu);
 344         break;
 345     default:
 346         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 347                      cpu_state);
 348         exit(1);
 349     }
 350     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 351         kvm_s390_set_cpu_state(cpu, cpu_state);
 352     }
 353     cpu->env.cpu_state = cpu_state;
 354
 355     return s390_count_running_cpus();
 356 }
 357
 358 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 359 {
 360     if (kvm_enabled()) {
 361         return kvm_s390_get_clock(tod_high, tod_low);
 362     }
 363     /* Fixme TCG */
 364     *tod_high = 0;
 365     *tod_low = 0;
 366     return 0;
 367 }
 368
 369 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 370 {
 371     if (kvm_enabled()) {
 372         return kvm_s390_set_clock(tod_high, tod_low);
 373     }
 374     /* Fixme TCG */
 375     return 0;
 376 }
 377
 378 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 379 {
 380     if (kvm_enabled()) {
 381         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 382     }
 383     return 0;
 384 }
 385
 386 void s390_cmma_reset(void)
 387 {
 388     if (kvm_enabled()) {
 389         kvm_s390_cmma_reset();
 390     }
 391 }
 392
 393 int s390_cpu_restart(S390CPU *cpu)
 394 {
 395     if (kvm_enabled()) {
 396         return kvm_s390_cpu_restart(cpu);
 397     }
 398     return -ENOSYS;
 399 }
 400
 401 int s390_get_memslot_count(void)
 402 {
 403     if (kvm_enabled()) {
 404         return kvm_s390_get_memslot_count();
 405     } else {
 406         return MAX_AVAIL_SLOTS;
 407     }
 408 }
 409
 410 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 411                                 int vq, bool assign)
 412 {
 413     if (kvm_enabled()) {
 414         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 415     } else {
 416         return 0;
 417     }
 418 }
 419
 420 void s390_crypto_reset(void)
 421 {
 422     if (kvm_enabled()) {
 423         kvm_s390_crypto_reset();
 424     }
 425 }
 426
 427 bool s390_get_squash_mcss(void)
 428 {
 429     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 430                                  NULL)) {
 431         return true;
 432     }
 433
 434     return false;
 435 }
 436
 437 void s390_enable_css_support(S390CPU *cpu)
 438 {
 439     if (kvm_enabled()) {
 440         kvm_s390_enable_css_support(cpu);
 441     }
 442 }
 443 #endif
 444
 445 static gchar *s390_gdb_arch_name(CPUState *cs)
 446 {
 447     return g_strdup("s390:64-bit");
 448 }
 449
 450 static Property s390x_cpu_properties[] = {
 451     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 452     DEFINE_PROP_END_OF_LIST()
 453 };
 454
 455 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 456 {
 457     S390CPUClass *scc = S390_CPU_CLASS(oc);
 458     CPUClass *cc = CPU_CLASS(scc);
 459     DeviceClass *dc = DEVICE_CLASS(oc);
 460
 461     scc->parent_realize = dc->realize;
 462     dc->realize = s390_cpu_realizefn;
 463     dc->props = s390x_cpu_properties;
 464     dc->user_creatable = true;
 465
 466     scc->parent_reset = cc->reset;
 467 #if !defined(CONFIG_USER_ONLY)
 468     scc->load_normal = s390_cpu_load_normal;
 469 #endif
 470     scc->cpu_reset = s390_cpu_reset;
 471     scc->initial_cpu_reset = s390_cpu_initial_reset;
 472     cc->reset = s390_cpu_full_reset;
 473     cc->class_by_name = s390_cpu_class_by_name,
 474     cc->has_work = s390_cpu_has_work;
 475 #ifdef CONFIG_TCG
 476     cc->do_interrupt = s390_cpu_do_interrupt;
 477 #endif
 478     cc->dump_state = s390_cpu_dump_state;
 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
 496     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 497     cc->gdb_core_xml_file = "s390x-core64.xml";
 498     cc->gdb_arch_name = s390_gdb_arch_name;
 499
 500     s390_cpu_model_class_register_props(oc);
 501 }
 502
 503 static const TypeInfo s390_cpu_type_info = {
 504     .name = TYPE_S390_CPU,
 505     .parent = TYPE_CPU,
 506     .instance_size = sizeof(S390CPU),
 507     .instance_init = s390_cpu_initfn,
 508     .instance_finalize = s390_cpu_finalize,
 509     .abstract = true,
 510     .class_size = sizeof(S390CPUClass),
 511     .class_init = s390_cpu_class_init,
 512 };
 513
 514 static void s390_cpu_register_types(void)
 515 {
 516     type_register_static(&s390_cpu_type_info);
 517 }
 518
 519 type_init(s390_cpu_register_types)