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     CPUS390XState *env = &cpu->env;
  60
  61     return (cs->interrupt_request & CPU_INTERRUPT_HARD) &&
  62            (env->psw.mask & PSW_MASK_EXT);
  63 }
  64
  65 #if !defined(CONFIG_USER_ONLY)
  66 /* S390CPUClass::load_normal() */
  67 static void s390_cpu_load_normal(CPUState *s)
  68 {
  69     S390CPU *cpu = S390_CPU(s);
  70     cpu->env.psw.addr = ldl_phys(s->as, 4) & PSW_MASK_ESA_ADDR;
  71     cpu->env.psw.mask = PSW_MASK_32 | PSW_MASK_64;
  72     s390_cpu_set_state(CPU_STATE_OPERATING, cpu);
  73 }
  74 #endif
  75
  76 /* S390CPUClass::cpu_reset() */
  77 static void s390_cpu_reset(CPUState *s)
  78 {
  79     S390CPU *cpu = S390_CPU(s);
  80     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
  81     CPUS390XState *env = &cpu->env;
  82
  83     env->pfault_token = -1UL;
  84     scc->parent_reset(s);
  85     cpu->env.sigp_order = 0;
  86     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
  87 }
  88
  89 /* S390CPUClass::initial_reset() */
  90 static void s390_cpu_initial_reset(CPUState *s)
  91 {
  92     S390CPU *cpu = S390_CPU(s);
  93     CPUS390XState *env = &cpu->env;
  94     int i;
  95
  96     s390_cpu_reset(s);
  97     /* initial reset does not clear everything! */
  98     memset(&env->start_initial_reset_fields, 0,
  99         offsetof(CPUS390XState, end_reset_fields) -
 100         offsetof(CPUS390XState, start_initial_reset_fields));
 101
 102     /* architectured initial values for CR 0 and 14 */
 103     env->cregs[0] = CR0_RESET;
 104     env->cregs[14] = CR14_RESET;
 105
 106     /* architectured initial value for Breaking-Event-Address register */
 107     env->gbea = 1;
 108
 109     env->pfault_token = -1UL;
 110     env->ext_index = -1;
 111     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 112         env->io_index[i] = -1;
 113     }
 114
 115     /* tininess for underflow is detected before rounding */
 116     set_float_detect_tininess(float_tininess_before_rounding,
 117                               &env->fpu_status);
 118
 119     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 120     if (kvm_enabled()) {
 121         kvm_s390_reset_vcpu(cpu);
 122     }
 123 }
 124
 125 /* CPUClass:reset() */
 126 static void s390_cpu_full_reset(CPUState *s)
 127 {
 128     S390CPU *cpu = S390_CPU(s);
 129     S390CPUClass *scc = S390_CPU_GET_CLASS(cpu);
 130     CPUS390XState *env = &cpu->env;
 131     int i;
 132
 133     scc->parent_reset(s);
 134     cpu->env.sigp_order = 0;
 135     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 136
 137     memset(env, 0, offsetof(CPUS390XState, end_reset_fields));
 138
 139     /* architectured initial values for CR 0 and 14 */
 140     env->cregs[0] = CR0_RESET;
 141     env->cregs[14] = CR14_RESET;
 142
 143     /* architectured initial value for Breaking-Event-Address register */
 144     env->gbea = 1;
 145
 146     env->pfault_token = -1UL;
 147     env->ext_index = -1;
 148     for (i = 0; i < ARRAY_SIZE(env->io_index); i++) {
 149         env->io_index[i] = -1;
 150     }
 151
 152     /* tininess for underflow is detected before rounding */
 153     set_float_detect_tininess(float_tininess_before_rounding,
 154                               &env->fpu_status);
 155
 156     /* Reset state inside the kernel that we cannot access yet from QEMU. */
 157     if (kvm_enabled()) {
 158         kvm_s390_reset_vcpu(cpu);
 159     }
 160 }
 161
 162 #if !defined(CONFIG_USER_ONLY)
 163 static void s390_cpu_machine_reset_cb(void *opaque)
 164 {
 165     S390CPU *cpu = opaque;
 166
 167     run_on_cpu(CPU(cpu), s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 168 }
 169 #endif
 170
 171 static void s390_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 172 {
 173     info->mach = bfd_mach_s390_64;
 174     info->print_insn = print_insn_s390;
 175 }
 176
 177 static void s390_cpu_realizefn(DeviceState *dev, Error **errp)
 178 {
 179     CPUState *cs = CPU(dev);
 180     S390CPUClass *scc = S390_CPU_GET_CLASS(dev);
 181 #if !defined(CONFIG_USER_ONLY)
 182     S390CPU *cpu = S390_CPU(dev);
 183 #endif
 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
 200     if (cpu_exists(cpu->env.core_id)) {
 201         error_setg(&err, "Unable to add CPU with core-id: %" PRIu32
 202                    ", it already exists", cpu->env.core_id);
 203         goto out;
 204     }
 205
 206     /* sync cs->cpu_index and env->core_id. The latter is needed for TCG. */
 207     cs->cpu_index = cpu->env.core_id;
 208 #endif
 209
 210     cpu_exec_realizefn(cs, &err);
 211     if (err != NULL) {
 212         goto out;
 213     }
 214
 215 #if !defined(CONFIG_USER_ONLY)
 216     qemu_register_reset(s390_cpu_machine_reset_cb, cpu);
 217 #endif
 218     s390_cpu_gdb_init(cs);
 219     qemu_init_vcpu(cs);
 220 #if !defined(CONFIG_USER_ONLY)
 221     run_on_cpu(cs, s390_do_cpu_full_reset, RUN_ON_CPU_NULL);
 222 #else
 223     cpu_reset(cs);
 224 #endif
 225
 226     scc->parent_realize(dev, &err);
 227 out:
 228     error_propagate(errp, err);
 229 }
 230
 231 static void s390_cpu_initfn(Object *obj)
 232 {
 233     CPUState *cs = CPU(obj);
 234     S390CPU *cpu = S390_CPU(obj);
 235     CPUS390XState *env = &cpu->env;
 236     static bool inited;
 237 #if !defined(CONFIG_USER_ONLY)
 238     struct tm tm;
 239 #endif
 240
 241     cs->env_ptr = env;
 242     cs->halted = 1;
 243     cs->exception_index = EXCP_HLT;
 244     s390_cpu_model_register_props(obj);
 245 #if !defined(CONFIG_USER_ONLY)
 246     qemu_get_timedate(&tm, 0);
 247     env->tod_offset = TOD_UNIX_EPOCH +
 248                       (time2tod(mktimegm(&tm)) * 1000000000ULL);
 249     env->tod_basetime = 0;
 250     env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
 251     env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
 252     s390_cpu_set_state(CPU_STATE_STOPPED, cpu);
 253 #endif
 254
 255     if (tcg_enabled() && !inited) {
 256         inited = true;
 257         s390x_translate_init();
 258     }
 259 }
 260
 261 static void s390_cpu_finalize(Object *obj)
 262 {
 263 #if !defined(CONFIG_USER_ONLY)
 264     S390CPU *cpu = S390_CPU(obj);
 265
 266     qemu_unregister_reset(s390_cpu_machine_reset_cb, cpu);
 267     g_free(cpu->irqstate);
 268 #endif
 269 }
 270
 271 #if !defined(CONFIG_USER_ONLY)
 272 static bool disabled_wait(CPUState *cpu)
 273 {
 274     return cpu->halted && !(S390_CPU(cpu)->env.psw.mask &
 275                             (PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK));
 276 }
 277
 278 static unsigned s390_count_running_cpus(void)
 279 {
 280     CPUState *cpu;
 281     int nr_running = 0;
 282
 283     CPU_FOREACH(cpu) {
 284         uint8_t state = S390_CPU(cpu)->env.cpu_state;
 285         if (state == CPU_STATE_OPERATING ||
 286             state == CPU_STATE_LOAD) {
 287             if (!disabled_wait(cpu)) {
 288                 nr_running++;
 289             }
 290         }
 291     }
 292
 293     return nr_running;
 294 }
 295
 296 unsigned int s390_cpu_halt(S390CPU *cpu)
 297 {
 298     CPUState *cs = CPU(cpu);
 299     trace_cpu_halt(cs->cpu_index);
 300
 301     if (!cs->halted) {
 302         cs->halted = 1;
 303         cs->exception_index = EXCP_HLT;
 304     }
 305
 306     return s390_count_running_cpus();
 307 }
 308
 309 void s390_cpu_unhalt(S390CPU *cpu)
 310 {
 311     CPUState *cs = CPU(cpu);
 312     trace_cpu_unhalt(cs->cpu_index);
 313
 314     if (cs->halted) {
 315         cs->halted = 0;
 316         cs->exception_index = -1;
 317     }
 318 }
 319
 320 unsigned int s390_cpu_set_state(uint8_t cpu_state, S390CPU *cpu)
 321  {
 322     trace_cpu_set_state(CPU(cpu)->cpu_index, cpu_state);
 323
 324     switch (cpu_state) {
 325     case CPU_STATE_STOPPED:
 326     case CPU_STATE_CHECK_STOP:
 327         /* halt the cpu for common infrastructure */
 328         s390_cpu_halt(cpu);
 329         break;
 330     case CPU_STATE_OPERATING:
 331     case CPU_STATE_LOAD:
 332         /* unhalt the cpu for common infrastructure */
 333         s390_cpu_unhalt(cpu);
 334         break;
 335     default:
 336         error_report("Requested CPU state is not a valid S390 CPU state: %u",
 337                      cpu_state);
 338         exit(1);
 339     }
 340     if (kvm_enabled() && cpu->env.cpu_state != cpu_state) {
 341         kvm_s390_set_cpu_state(cpu, cpu_state);
 342     }
 343     cpu->env.cpu_state = cpu_state;
 344
 345     return s390_count_running_cpus();
 346 }
 347
 348 int s390_get_clock(uint8_t *tod_high, uint64_t *tod_low)
 349 {
 350     int r = 0;
 351
 352     if (kvm_enabled()) {
 353         r = kvm_s390_get_clock_ext(tod_high, tod_low);
 354         if (r == -ENXIO) {
 355             return kvm_s390_get_clock(tod_high, tod_low);
 356         }
 357     } else {
 358         /* Fixme TCG */
 359         *tod_high = 0;
 360         *tod_low = 0;
 361     }
 362
 363     return r;
 364 }
 365
 366 int s390_set_clock(uint8_t *tod_high, uint64_t *tod_low)
 367 {
 368     int r = 0;
 369
 370     if (kvm_enabled()) {
 371         r = kvm_s390_set_clock_ext(tod_high, tod_low);
 372         if (r == -ENXIO) {
 373             return kvm_s390_set_clock(tod_high, tod_low);
 374         }
 375     }
 376     /* Fixme TCG */
 377     return r;
 378 }
 379
 380 int s390_set_memory_limit(uint64_t new_limit, uint64_t *hw_limit)
 381 {
 382     if (kvm_enabled()) {
 383         return kvm_s390_set_mem_limit(new_limit, hw_limit);
 384     }
 385     return 0;
 386 }
 387
 388 void s390_cmma_reset(void)
 389 {
 390     if (kvm_enabled()) {
 391         kvm_s390_cmma_reset();
 392     }
 393 }
 394
 395 int s390_cpu_restart(S390CPU *cpu)
 396 {
 397     if (kvm_enabled()) {
 398         return kvm_s390_cpu_restart(cpu);
 399     }
 400     return -ENOSYS;
 401 }
 402
 403 int s390_get_memslot_count(void)
 404 {
 405     if (kvm_enabled()) {
 406         return kvm_s390_get_memslot_count();
 407     } else {
 408         return MAX_AVAIL_SLOTS;
 409     }
 410 }
 411
 412 int s390_assign_subch_ioeventfd(EventNotifier *notifier, uint32_t sch_id,
 413                                 int vq, bool assign)
 414 {
 415     if (kvm_enabled()) {
 416         return kvm_s390_assign_subch_ioeventfd(notifier, sch_id, vq, assign);
 417     } else {
 418         return 0;
 419     }
 420 }
 421
 422 void s390_crypto_reset(void)
 423 {
 424     if (kvm_enabled()) {
 425         kvm_s390_crypto_reset();
 426     }
 427 }
 428
 429 bool s390_get_squash_mcss(void)
 430 {
 431     if (object_property_get_bool(OBJECT(qdev_get_machine()), "s390-squash-mcss",
 432                                  NULL)) {
 433         return true;
 434     }
 435
 436     return false;
 437 }
 438
 439 void s390_enable_css_support(S390CPU *cpu)
 440 {
 441     if (kvm_enabled()) {
 442         kvm_s390_enable_css_support(cpu);
 443     }
 444 }
 445 #endif
 446
 447 static gchar *s390_gdb_arch_name(CPUState *cs)
 448 {
 449     return g_strdup("s390:64-bit");
 450 }
 451
 452 static Property s390x_cpu_properties[] = {
 453 #if !defined(CONFIG_USER_ONLY)
 454     DEFINE_PROP_UINT32("core-id", S390CPU, env.core_id, 0),
 455 #endif
 456     DEFINE_PROP_END_OF_LIST()
 457 };
 458
 459 static void s390_cpu_class_init(ObjectClass *oc, void *data)
 460 {
 461     S390CPUClass *scc = S390_CPU_CLASS(oc);
 462     CPUClass *cc = CPU_CLASS(scc);
 463     DeviceClass *dc = DEVICE_CLASS(oc);
 464
 465     scc->parent_realize = dc->realize;
 466     dc->realize = s390_cpu_realizefn;
 467     dc->props = s390x_cpu_properties;
 468     dc->user_creatable = true;
 469
 470     scc->parent_reset = cc->reset;
 471 #if !defined(CONFIG_USER_ONLY)
 472     scc->load_normal = s390_cpu_load_normal;
 473 #endif
 474     scc->cpu_reset = s390_cpu_reset;
 475     scc->initial_cpu_reset = s390_cpu_initial_reset;
 476     cc->reset = s390_cpu_full_reset;
 477     cc->class_by_name = s390_cpu_class_by_name,
 478     cc->has_work = s390_cpu_has_work;
 479 #ifdef CONFIG_TCG
 480     cc->do_interrupt = s390_cpu_do_interrupt;
 481 #endif
 482     cc->dump_state = s390_cpu_dump_state;
 483     cc->set_pc = s390_cpu_set_pc;
 484     cc->gdb_read_register = s390_cpu_gdb_read_register;
 485     cc->gdb_write_register = s390_cpu_gdb_write_register;
 486 #ifdef CONFIG_USER_ONLY
 487     cc->handle_mmu_fault = s390_cpu_handle_mmu_fault;
 488 #else
 489     cc->get_phys_page_debug = s390_cpu_get_phys_page_debug;
 490     cc->vmsd = &vmstate_s390_cpu;
 491     cc->write_elf64_note = s390_cpu_write_elf64_note;
 492 #ifdef CONFIG_TCG
 493     cc->cpu_exec_interrupt = s390_cpu_exec_interrupt;
 494     cc->debug_excp_handler = s390x_cpu_debug_excp_handler;
 495     cc->do_unaligned_access = s390x_cpu_do_unaligned_access;
 496 #endif
 497 #endif
 498     cc->disas_set_info = s390_cpu_disas_set_info;
 499
 500     cc->gdb_num_core_regs = S390_NUM_CORE_REGS;
 501     cc->gdb_core_xml_file = "s390x-core64.xml";
 502     cc->gdb_arch_name = s390_gdb_arch_name;
 503
 504     s390_cpu_model_class_register_props(oc);
 505 }
 506
 507 static const TypeInfo s390_cpu_type_info = {
 508     .name = TYPE_S390_CPU,
 509     .parent = TYPE_CPU,
 510     .instance_size = sizeof(S390CPU),
 511     .instance_init = s390_cpu_initfn,
 512     .instance_finalize = s390_cpu_finalize,
 513     .abstract = true,
 514     .class_size = sizeof(S390CPUClass),
 515     .class_init = s390_cpu_class_init,
 516 };
 517
 518 static void s390_cpu_register_types(void)
 519 {
 520     type_register_static(&s390_cpu_type_info);
 521 }
 522
 523 type_init(s390_cpu_register_types)