qom/cpu.c

   1 /*
   2  * QEMU CPU model
   3  *
   4  * Copyright (c) 2012-2014 SUSE LINUX Products GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, see
  18  * <http://www.gnu.org/licenses/gpl-2.0.html>
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "qapi/error.h"
  23 #include "qemu-common.h"
  24 #include "qom/cpu.h"
  25 #include "sysemu/hw_accel.h"
  26 #include "qemu/notify.h"
  27 #include "qemu/log.h"
  28 #include "exec/log.h"
  29 #include "exec/cpu-common.h"
  30 #include "qemu/error-report.h"
  31 #include "sysemu/sysemu.h"
  32 #include "hw/boards.h"
  33 #include "hw/qdev-properties.h"
  34 #include "trace-root.h"
  35
  36 CPUInterruptHandler cpu_interrupt_handler;
  37
  38 CPUState *cpu_by_arch_id(int64_t id)
  39 {
  40     CPUState *cpu;
  41
  42     CPU_FOREACH(cpu) {
  43         CPUClass *cc = CPU_GET_CLASS(cpu);
  44
  45         if (cc->get_arch_id(cpu) == id) {
  46             return cpu;
  47         }
  48     }
  49     return NULL;
  50 }
  51
  52 bool cpu_exists(int64_t id)
  53 {
  54     return !!cpu_by_arch_id(id);
  55 }
  56
  57 CPUState *cpu_create(const char *typename)
  58 {
  59     Error *err = NULL;
  60     CPUState *cpu = CPU(object_new(typename));
  61     object_property_set_bool(OBJECT(cpu), true, "realized", &err);
  62     if (err != NULL) {
  63         error_report_err(err);
  64         object_unref(OBJECT(cpu));
  65         return NULL;
  66     }
  67     return cpu;
  68 }
  69
  70 const char *cpu_parse_cpu_model(const char *typename, const char *cpu_model)
  71 {
  72     ObjectClass *oc;
  73     CPUClass *cc;
  74     Error *err = NULL;
  75     gchar **model_pieces;
  76     const char *cpu_type;
  77
  78     model_pieces = g_strsplit(cpu_model, ",", 2);
  79
  80     oc = cpu_class_by_name(typename, model_pieces[0]);
  81     if (oc == NULL) {
  82         g_strfreev(model_pieces);
  83         return NULL;
  84     }
  85
  86     cpu_type = object_class_get_name(oc);
  87     cc = CPU_CLASS(oc);
  88     cc->parse_features(cpu_type, model_pieces[1], &err);
  89     g_strfreev(model_pieces);
  90     if (err != NULL) {
  91         error_report_err(err);
  92         return NULL;
  93     }
  94     return cpu_type;
  95 }
  96
  97 CPUState *cpu_generic_init(const char *typename, const char *cpu_model)
  98 {
  99     /* TODO: all callers of cpu_generic_init() need to be converted to
 100      * call cpu_parse_features() only once, before calling cpu_generic_init().
 101      */
 102     const char *cpu_type = cpu_parse_cpu_model(typename, cpu_model);
 103
 104     if (cpu_type) {
 105         return cpu_create(cpu_type);
 106     }
 107     return NULL;
 108 }
 109
 110 bool cpu_paging_enabled(const CPUState *cpu)
 111 {
 112     CPUClass *cc = CPU_GET_CLASS(cpu);
 113
 114     return cc->get_paging_enabled(cpu);
 115 }
 116
 117 static bool cpu_common_get_paging_enabled(const CPUState *cpu)
 118 {
 119     return false;
 120 }
 121
 122 void cpu_get_memory_mapping(CPUState *cpu, MemoryMappingList *list,
 123                             Error **errp)
 124 {
 125     CPUClass *cc = CPU_GET_CLASS(cpu);
 126
 127     cc->get_memory_mapping(cpu, list, errp);
 128 }
 129
 130 static void cpu_common_get_memory_mapping(CPUState *cpu,
 131                                           MemoryMappingList *list,
 132                                           Error **errp)
 133 {
 134     error_setg(errp, "Obtaining memory mappings is unsupported on this CPU.");
 135 }
 136
 137 /* Resetting the IRQ comes from across the code base so we take the
 138  * BQL here if we need to.  cpu_interrupt assumes it is held.*/
 139 void cpu_reset_interrupt(CPUState *cpu, int mask)
 140 {
 141     bool need_lock = !qemu_mutex_iothread_locked();
 142
 143     if (need_lock) {
 144         qemu_mutex_lock_iothread();
 145     }
 146     cpu->interrupt_request &= ~mask;
 147     if (need_lock) {
 148         qemu_mutex_unlock_iothread();
 149     }
 150 }
 151
 152 void cpu_exit(CPUState *cpu)
 153 {
 154     atomic_set(&cpu->exit_request, 1);
 155     /* Ensure cpu_exec will see the exit request after TCG has exited.  */
 156     smp_wmb();
 157     atomic_set(&cpu->icount_decr.u16.high, -1);
 158 }
 159
 160 int cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 161                              void *opaque)
 162 {
 163     CPUClass *cc = CPU_GET_CLASS(cpu);
 164
 165     return (*cc->write_elf32_qemunote)(f, cpu, opaque);
 166 }
 167
 168 static int cpu_common_write_elf32_qemunote(WriteCoreDumpFunction f,
 169                                            CPUState *cpu, void *opaque)
 170 {
 171     return 0;
 172 }
 173
 174 int cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cpu,
 175                          int cpuid, void *opaque)
 176 {
 177     CPUClass *cc = CPU_GET_CLASS(cpu);
 178
 179     return (*cc->write_elf32_note)(f, cpu, cpuid, opaque);
 180 }
 181
 182 static int cpu_common_write_elf32_note(WriteCoreDumpFunction f,
 183                                        CPUState *cpu, int cpuid,
 184                                        void *opaque)
 185 {
 186     return -1;
 187 }
 188
 189 int cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 190                              void *opaque)
 191 {
 192     CPUClass *cc = CPU_GET_CLASS(cpu);
 193
 194     return (*cc->write_elf64_qemunote)(f, cpu, opaque);
 195 }
 196
 197 static int cpu_common_write_elf64_qemunote(WriteCoreDumpFunction f,
 198                                            CPUState *cpu, void *opaque)
 199 {
 200     return 0;
 201 }
 202
 203 int cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cpu,
 204                          int cpuid, void *opaque)
 205 {
 206     CPUClass *cc = CPU_GET_CLASS(cpu);
 207
 208     return (*cc->write_elf64_note)(f, cpu, cpuid, opaque);
 209 }
 210
 211 static int cpu_common_write_elf64_note(WriteCoreDumpFunction f,
 212                                        CPUState *cpu, int cpuid,
 213                                        void *opaque)
 214 {
 215     return -1;
 216 }
 217
 218
 219 static int cpu_common_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg)
 220 {
 221     return 0;
 222 }
 223
 224 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
 225 {
 226     return 0;
 227 }
 228
 229 static bool cpu_common_debug_check_watchpoint(CPUState *cpu, CPUWatchpoint *wp)
 230 {
 231     /* If no extra check is required, QEMU watchpoint match can be considered
 232      * as an architectural match.
 233      */
 234     return true;
 235 }
 236
 237 bool target_words_bigendian(void);
 238 static bool cpu_common_virtio_is_big_endian(CPUState *cpu)
 239 {
 240     return target_words_bigendian();
 241 }
 242
 243 static void cpu_common_noop(CPUState *cpu)
 244 {
 245 }
 246
 247 static bool cpu_common_exec_interrupt(CPUState *cpu, int int_req)
 248 {
 249     return false;
 250 }
 251
 252 GuestPanicInformation *cpu_get_crash_info(CPUState *cpu)
 253 {
 254     CPUClass *cc = CPU_GET_CLASS(cpu);
 255     GuestPanicInformation *res = NULL;
 256
 257     if (cc->get_crash_info) {
 258         res = cc->get_crash_info(cpu);
 259     }
 260     return res;
 261 }
 262
 263 void cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
 264                     int flags)
 265 {
 266     CPUClass *cc = CPU_GET_CLASS(cpu);
 267
 268     if (cc->dump_state) {
 269         cpu_synchronize_state(cpu);
 270         cc->dump_state(cpu, f, cpu_fprintf, flags);
 271     }
 272 }
 273
 274 void cpu_dump_statistics(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
 275                          int flags)
 276 {
 277     CPUClass *cc = CPU_GET_CLASS(cpu);
 278
 279     if (cc->dump_statistics) {
 280         cc->dump_statistics(cpu, f, cpu_fprintf, flags);
 281     }
 282 }
 283
 284 void cpu_reset(CPUState *cpu)
 285 {
 286     CPUClass *klass = CPU_GET_CLASS(cpu);
 287
 288     if (klass->reset != NULL) {
 289         (*klass->reset)(cpu);
 290     }
 291
 292     trace_guest_cpu_reset(cpu);
 293 }
 294
 295 static void cpu_common_reset(CPUState *cpu)
 296 {
 297     CPUClass *cc = CPU_GET_CLASS(cpu);
 298
 299     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
 300         qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
 301         log_cpu_state(cpu, cc->reset_dump_flags);
 302     }
 303
 304     cpu->interrupt_request = 0;
 305     cpu->halted = 0;
 306     cpu->mem_io_pc = 0;
 307     cpu->mem_io_vaddr = 0;
 308     cpu->icount_extra = 0;
 309     cpu->icount_decr.u32 = 0;
 310     cpu->can_do_io = 1;
 311     cpu->exception_index = -1;
 312     cpu->crash_occurred = false;
 313
 314     if (tcg_enabled()) {
 315         cpu_tb_jmp_cache_clear(cpu);
 316
 317         tcg_flush_softmmu_tlb(cpu);
 318     }
 319 }
 320
 321 static bool cpu_common_has_work(CPUState *cs)
 322 {
 323     return false;
 324 }
 325
 326 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
 327 {
 328     CPUClass *cc = CPU_CLASS(object_class_by_name(typename));
 329
 330     return cc->class_by_name(cpu_model);
 331 }
 332
 333 static ObjectClass *cpu_common_class_by_name(const char *cpu_model)
 334 {
 335     return NULL;
 336 }
 337
 338 static void cpu_common_parse_features(const char *typename, char *features,
 339                                       Error **errp)
 340 {
 341     char *featurestr; /* Single "key=value" string being parsed */
 342     char *val;
 343     static bool cpu_globals_initialized;
 344
 345     /* TODO: all callers of ->parse_features() need to be changed to
 346      * call it only once, so we can remove this check (or change it
 347      * to assert(!cpu_globals_initialized).
 348      * Current callers of ->parse_features() are:
 349      * - cpu_generic_init()
 350      */
 351     if (cpu_globals_initialized) {
 352         return;
 353     }
 354     cpu_globals_initialized = true;
 355
 356     featurestr = features ? strtok(features, ",") : NULL;
 357
 358     while (featurestr) {
 359         val = strchr(featurestr, '=');
 360         if (val) {
 361             GlobalProperty *prop = g_new0(typeof(*prop), 1);
 362             *val = 0;
 363             val++;
 364             prop->driver = typename;
 365             prop->property = g_strdup(featurestr);
 366             prop->value = g_strdup(val);
 367             prop->errp = &error_fatal;
 368             qdev_prop_register_global(prop);
 369         } else {
 370             error_setg(errp, "Expected key=value format, found %s.",
 371                        featurestr);
 372             return;
 373         }
 374         featurestr = strtok(NULL, ",");
 375     }
 376 }
 377
 378 static void cpu_common_realizefn(DeviceState *dev, Error **errp)
 379 {
 380     CPUState *cpu = CPU(dev);
 381     Object *machine = qdev_get_machine();
 382
 383     /* qdev_get_machine() can return something that's not TYPE_MACHINE
 384      * if this is one of the user-only emulators; in that case there's
 385      * no need to check the ignore_memory_transaction_failures board flag.
 386      */
 387     if (object_dynamic_cast(machine, TYPE_MACHINE)) {
 388         ObjectClass *oc = object_get_class(machine);
 389         MachineClass *mc = MACHINE_CLASS(oc);
 390
 391         if (mc) {
 392             cpu->ignore_memory_transaction_failures =
 393                 mc->ignore_memory_transaction_failures;
 394         }
 395     }
 396
 397     if (dev->hotplugged) {
 398         cpu_synchronize_post_init(cpu);
 399         cpu_resume(cpu);
 400     }
 401
 402     /* NOTE: latest generic point where the cpu is fully realized */
 403     trace_init_vcpu(cpu);
 404 }
 405
 406 static void cpu_common_unrealizefn(DeviceState *dev, Error **errp)
 407 {
 408     CPUState *cpu = CPU(dev);
 409     /* NOTE: latest generic point before the cpu is fully unrealized */
 410     trace_fini_vcpu(cpu);
 411     cpu_exec_unrealizefn(cpu);
 412 }
 413
 414 static void cpu_common_initfn(Object *obj)
 415 {
 416     CPUState *cpu = CPU(obj);
 417     CPUClass *cc = CPU_GET_CLASS(obj);
 418
 419     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
 420     cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
 421     /* *-user doesn't have configurable SMP topology */
 422     /* the default value is changed by qemu_init_vcpu() for softmmu */
 423     cpu->nr_cores = 1;
 424     cpu->nr_threads = 1;
 425
 426     qemu_mutex_init(&cpu->work_mutex);
 427     QTAILQ_INIT(&cpu->breakpoints);
 428     QTAILQ_INIT(&cpu->watchpoints);
 429
 430     cpu_exec_initfn(cpu);
 431 }
 432
 433 static void cpu_common_finalize(Object *obj)
 434 {
 435 }
 436
 437 static int64_t cpu_common_get_arch_id(CPUState *cpu)
 438 {
 439     return cpu->cpu_index;
 440 }
 441
 442 static vaddr cpu_adjust_watchpoint_address(CPUState *cpu, vaddr addr, int len)
 443 {
 444     return addr;
 445 }
 446
 447 static void generic_handle_interrupt(CPUState *cpu, int mask)
 448 {
 449     cpu->interrupt_request |= mask;
 450
 451     if (!qemu_cpu_is_self(cpu)) {
 452         qemu_cpu_kick(cpu);
 453     }
 454 }
 455
 456 CPUInterruptHandler cpu_interrupt_handler = generic_handle_interrupt;
 457
 458 static void cpu_class_init(ObjectClass *klass, void *data)
 459 {
 460     DeviceClass *dc = DEVICE_CLASS(klass);
 461     CPUClass *k = CPU_CLASS(klass);
 462
 463     k->class_by_name = cpu_common_class_by_name;
 464     k->parse_features = cpu_common_parse_features;
 465     k->reset = cpu_common_reset;
 466     k->get_arch_id = cpu_common_get_arch_id;
 467     k->has_work = cpu_common_has_work;
 468     k->get_paging_enabled = cpu_common_get_paging_enabled;
 469     k->get_memory_mapping = cpu_common_get_memory_mapping;
 470     k->write_elf32_qemunote = cpu_common_write_elf32_qemunote;
 471     k->write_elf32_note = cpu_common_write_elf32_note;
 472     k->write_elf64_qemunote = cpu_common_write_elf64_qemunote;
 473     k->write_elf64_note = cpu_common_write_elf64_note;
 474     k->gdb_read_register = cpu_common_gdb_read_register;
 475     k->gdb_write_register = cpu_common_gdb_write_register;
 476     k->virtio_is_big_endian = cpu_common_virtio_is_big_endian;
 477     k->debug_excp_handler = cpu_common_noop;
 478     k->debug_check_watchpoint = cpu_common_debug_check_watchpoint;
 479     k->cpu_exec_enter = cpu_common_noop;
 480     k->cpu_exec_exit = cpu_common_noop;
 481     k->cpu_exec_interrupt = cpu_common_exec_interrupt;
 482     k->adjust_watchpoint_address = cpu_adjust_watchpoint_address;
 483     set_bit(DEVICE_CATEGORY_CPU, dc->categories);
 484     dc->realize = cpu_common_realizefn;
 485     dc->unrealize = cpu_common_unrealizefn;
 486     dc->props = cpu_common_props;
 487     /*
 488      * Reason: CPUs still need special care by board code: wiring up
 489      * IRQs, adding reset handlers, halting non-first CPUs, ...
 490      */
 491     dc->user_creatable = false;
 492 }
 493
 494 static const TypeInfo cpu_type_info = {
 495     .name = TYPE_CPU,
 496     .parent = TYPE_DEVICE,
 497     .instance_size = sizeof(CPUState),
 498     .instance_init = cpu_common_initfn,
 499     .instance_finalize = cpu_common_finalize,
 500     .abstract = true,
 501     .class_size = sizeof(CPUClass),
 502     .class_init = cpu_class_init,
 503 };
 504
 505 static void cpu_register_types(void)
 506 {
 507     type_register_static(&cpu_type_info);
 508 }
 509
 510 type_init(cpu_register_types)