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 #endif
  45
  46 #define CR0_RESET       0xE0UL
  47 #define CR14_RESET      0xC2000000UL;
  48
  49 static void s390_cpu_set_pc(CPUState *cs, vaddr value)
  50 {
  51     S390CPU *cpu = S390_CPU(cs);
  52
  53     cpu->env.psw.addr = value;
  54 }
  55
  56 static bool s390_cpu_has_work(CPUState *cs)
  57 {
  58     S390CPU *cpu = S390_CPU(cs);
  59
  60     /* STOPPED cpus can never wake up */
  61     if (s390_cpu_get_state(cpu) != CPU_STATE_LOAD &&
  62         s390_cpu_get_state(cpu) != CPU_STATE_OPERATING) {
  63         return false;
  64     }
  65
  66     if (!(cs->interrupt_request & CPU_INTERRUPT_HARD)) {
  67         return false;
  68     }
  69
  70     return s390_cpu_has_int(cpu);
  71 }
  72
  73 #if !defined(CONFIG_USER_ONLY)
  74 /* S390CPUClass::load_normal() */
  75 static void s390_cpu_load_normal(CPUState *s)
  76 {
  77     S390CPU *cpu = S390_CPU(s);
  78     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  79     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  80     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  81 }
  82 #endif
  83
  84 /* S390CPUClass::cpu_reset() */
  85 static void s390_cpu_reset(CPUState *s)
  86 {
  87     S390CPU *cpu = S390_CPU(s);
  88     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  89     CPUS390XState *env = &cpu->env;
  90
  91     env->pfault_token = -1UL;
  92     env->bpbc = false;
  93     scc->parent_reset(s);
  94     cpu->env.sigp_order = 0;
  95     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
  96 }
  97
  98 /* S390CPUClass::initial_reset() */
  99 static void s390_cpu_initial_reset(CPUState *s)
 100 {
 101     S390CPU *cpu = S390_CPU(s);
 102     CPUS390XState *env = &cpu->env;
 103     int i;
 104
 105     s390_cpu_reset(s);
 106     /* initial reset does not clear everything! */
 107     memset(&env->start_initial_reset_fields, 0,
 108         offsetof(CPUS390XState, end_reset_fields) -
 109         offsetof(CPUS390XState, start_initial_reset_fields));
 110
 111     /* architectured initial values for CR 0 and 14 */
 112     env->cregs[0] = CR0_RESET;
 113     env->cregs[14] = CR14_RESET;
 114
 115     /* architectured initial value for Breaking-Event-Address register */
 116     env->gbea = 1;
 117
 118     env->pfault_token = -1UL;
 119     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 120         env->io_index[i] = -1;
 121     }
 122     env->mchk_index = -1;
 123
 124     /* tininess for underflow is detected before rounding */
 125     set_float_detect_tininess(float_tininess_before_rounding,
 126                               &env->fpu_status);
 127
 128     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 129     if (kvm_enabled()) {
 130         kvm_s390_reset_vcpu(cpu);
 131     }
 132 }
 133
 134 /* CPUClass:reset() */
 135 static void s390_cpu_full_reset(CPUState *s)
 136 {
 137     S390CPU *cpu = S390_CPU(s);
 138     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 139     CPUS390XState *env = &cpu->env;
 140     int i;
 141
 142     scc->parent_reset(s);
 143     cpu->env.sigp_order = 0;
 144     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 145
 146     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 147
 148     /* architectured initial values for CR 0 and 14 */
 149     env->cregs[0] = CR0_RESET;
 150     env->cregs[14] = CR14_RESET;
 151
 152     /* architectured initial value for Breaking-Event-Address register */
 153     env->gbea = 1;
 154
 155     env->pfault_token = -1UL;
 156     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 157         env->io_index[i] = -1;
 158     }
 159     env->mchk_index = -1;
 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     if (cpu->env.core_id >= max_cpus) {
 203         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 204                    ", maximum core-id: %d", cpu->env.core_id,
 205                    max_cpus - 1);
 206         goto out;
 207     }
 208
 209     if (cpu_exists(cpu->env.core_id)) {
 210         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 211                    ", it already exists", cpu->env.core_id);
 212         goto out;
 213     }
 214
 215     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 216     cs->cpu_index = cpu->env.core_id;
 217 #endif
 218
 219     cpu_exec_realizefn(cs, &err);
 220     if (err != NULL) {
 221         goto out;
 222     }
 223
 224 #if !defined(CONFIG_USER_ONLY)
 225     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 226 #endif
 227     s390_cpu_gdb_init(cs);
 228     qemu_init_vcpu(cs);
 229 #if !defined(CONFIG_USER_ONLY)
 230     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 231 #else
 232     cpu_reset(cs);
 233 #endif
 234
 235     scc->parent_realize(dev, &err);
 236 out:
 237     error_propagate(errp, err);
 238 }
 239
 240 static void s390_cpu_initfn(Object *obj)
 241 {
 242     CPUState *cs = CPU(obj);
 243     S390CPU *cpu = S390_CPU(obj);
 244     CPUS390XState *env = &cpu->env;
 245 #if !defined(CONFIG_USER_ONLY)
 246     struct tm tm;
 247 #endif
 248
 249     cs->env_ptr = env;
 250     cs->halted = 1;
 251     cs->exception_index = EXCP_HLT;
 252     s390_cpu_model_register_props(obj);
 253 #if !defined(CONFIG_USER_ONLY)
 254     qemu_get_timedate(&tm, 0);
 255     env->tod_offset = TOD_UNIX_EPOCH +
 256                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 257     env->tod_basetime = 0;
 258     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 259     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 260     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 261 #endif
 262 }
 263
 264 static void s390_cpu_finalize(Object *obj)
 265 {
 266 #if !defined(CONFIG_USER_ONLY)
 267     S390CPU *cpu = S390_CPU(obj);
 268
 269     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 270     g_free(cpu->irqstate);
 271 #endif
 272 }
 273
 274 #if !defined(CONFIG_USER_ONLY)
 275 static bool disabled_wait(CPUState *cpu)
 276 {
 277     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 278                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 279 }
 280
 281 static unsigned s390_count_running_cpus(void)
 282 {
 283     CPUState *cpu;
 284     int nr_running = 0;
 285
 286     CPU_FOREACH(cpu) {
 287         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 288         if (state == CPU_STATE_OPERATING ||
 289             state == CPU_STATE_LOAD) {
 290             if (!disabled_wait(cpu)) {
 291                 nr_running++;
 292             }
 293         }
 294     }
 295
 296     return nr_running;
 297 }
 298
 299 unsigned int s390_cpu_halt(S390CPU *cpu)
 300 {
 301     CPUState *cs = CPU(cpu);
 302     trace_cpu_halt(cs->cpu_index);
 303
 304     if (!cs->halted) {
 305         cs->halted = 1;
 306         cs->exception_index = EXCP_HLT;
 307     }
 308
 309     return s390_count_running_cpus();
 310 }
 311
 312 void s390_cpu_unhalt(S390CPU *cpu)
 313 {
 314     CPUState *cs = CPU(cpu);
 315     trace_cpu_unhalt(cs->cpu_index);
 316
 317     if (cs->halted) {
 318         cs->halted = 0;
 319         cs->exception_index = -1;
 320     }
 321 }
 322
 323 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 324  {
 325     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 326
 327     switch (cpu_state) {
 328     case CPU_STATE_STOPPED:
 329     case CPU_STATE_CHECK_STOP:
 330         /* halt the cpu for common infrastructure */
 331         s390_cpu_halt(cpu);
 332         break;
 333     case CPU_STATE_OPERATING:
 334     case CPU_STATE_LOAD:
 335         /*
 336          * Starting a CPU with a PSW WAIT bit set:
 337          * KVM: handles this internally and triggers another WAIT exit.
 338          * TCG: will actually try to continue to run. Don't unhalt, will
 339          *      be done when the CPU actually has work (an interrupt).
 340          */
 341         if (!tcg_enabled() || !(cpu->env.psw.mask & PSW_MASK_WAIT)) {
 342             s390_cpu_unhalt(cpu);
 343         }
 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     int r = 0;
 361
 362     if (kvm_enabled()) {
 363         r = kvm_s390_get_clock_ext(tod_high, tod_low);
 364         if (r == -ENXIO) {
 365             return kvm_s390_get_clock(tod_high, tod_low);
 366         }
 367     } else {
 368         /* Fixme TCG */
 369         *tod_high = 0;
 370         *tod_low = 0;
 371     }
 372
 373     return r;
 374 }
 375
 376 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 377 {
 378     int r = 0;
 379
 380     if (kvm_enabled()) {
 381         r = kvm_s390_set_clock_ext(tod_high, tod_low);
 382         if (r == -ENXIO) {
 383             return kvm_s390_set_clock(tod_high, tod_low);
 384         }
 385     }
 386     /* Fixme TCG */
 387     return r;
 388 }
 389
 390 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 391 {
 392     if (kvm_enabled()) {
 393         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 394     }
 395     return 0;
 396 }
 397
 398 void s390_cmma_reset(void)
 399 {
 400     if (kvm_enabled()) {
 401         kvm_s390_cmma_reset();
 402     }
 403 }
 404
 405 int s390_get_memslot_count(void)
 406 {
 407     if (kvm_enabled()) {
 408         return kvm_s390_get_memslot_count();
 409     } else {
 410         return MAX_AVAIL_SLOTS;
 411     }
 412 }
 413
 414 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 415                                 int vq, bool assign)
 416 {
 417     if (kvm_enabled()) {
 418         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 419     } else {
 420         return 0;
 421     }
 422 }
 423
 424 void s390_crypto_reset(void)
 425 {
 426     if (kvm_enabled()) {
 427         kvm_s390_crypto_reset();
 428     }
 429 }
 430
 431 bool s390_get_squash_mcss(void)
 432 {
 433     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 434                                  NULL)) {
 435         return true;
 436     }
 437
 438     return false;
 439 }
 440
 441 void s390_enable_css_support(S390CPU *cpu)
 442 {
 443     if (kvm_enabled()) {
 444         kvm_s390_enable_css_support(cpu);
 445     }
 446 }
 447 #endif
 448
 449 static gchar *s390_gdb_arch_name(CPUState *cs)
 450 {
 451     return g_strdup("s390:64-bit");
 452 }
 453
 454 static Property s390x_cpu_properties[] = {
 455 #if !defined(CONFIG_USER_ONLY)
 456     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 457 #endif
 458     DEFINE_PROP_END_OF_LIST()
 459 };
 460
 461 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 462 {
 463     S390CPUClass *scc = S390_CPU_CLASS(oc);
 464     CPUClass *cc = CPU_CLASS(scc);
 465     DeviceClass *dc = DEVICE_CLASS(oc);
 466
 467     device_class_set_parent_realize(dc, s390_cpu_realizefn,
 468                                     &scc->parent_realize);
 469     dc->props = s390x_cpu_properties;
 470     dc->user_creatable = true;
 471
 472     scc->parent_reset = cc->reset;
 473 #if !defined(CONFIG_USER_ONLY)
 474     scc->load_normal = s390_cpu_load_normal;
 475 #endif
 476     scc->cpu_reset = s390_cpu_reset;
 477     scc->initial_cpu_reset = s390_cpu_initial_reset;
 478     cc->reset = s390_cpu_full_reset;
 479     cc->class_by_name = s390_cpu_class_by_name,
 480     cc->has_work = s390_cpu_has_work;
 481 #ifdef CONFIG_TCG
 482     cc->do_interrupt = s390_cpu_do_interrupt;
 483 #endif
 484     cc->dump_state = s390_cpu_dump_state;
 485     cc->set_pc = s390_cpu_set_pc;
 486     cc->gdb_read_register = s390_cpu_gdb_read_register;
 487     cc->gdb_write_register = s390_cpu_gdb_write_register;
 488 #ifdef CONFIG_USER_ONLY
 489     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 490 #else
 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 #endif
 504
 505     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 506     cc->gdb_core_xml_file = "s390x-core64.xml";
 507     cc->gdb_arch_name = s390_gdb_arch_name;
 508
 509     s390_cpu_model_class_register_props(oc);
 510 }
 511
 512 static const TypeInfo s390_cpu_type_info = {
 513     .name = TYPE_S390_CPU,
 514     .parent = TYPE_CPU,
 515     .instance_size = sizeof(S390CPU),
 516     .instance_init = s390_cpu_initfn,
 517     .instance_finalize = s390_cpu_finalize,
 518     .abstract = true,
 519     .class_size = sizeof(S390CPUClass),
 520     .class_init = s390_cpu_class_init,
 521 };
 522
 523 static void s390_cpu_register_types(void)
 524 {
 525     type_register_static(&s390_cpu_type_info);
 526 }
 527
 528 type_init(s390_cpu_register_types)