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 "qemu/error-report.h"
  30 #include "sysemu/sysemu.h"
  31 #include "hw/qdev-properties.h"
  32 #include "trace-root.h"
  33
  34 bool cpu_exists(int64_t id)
  35 {
  36     CPUState *cpu;
  37
  38     CPU_FOREACH(cpu) {
  39         CPUClass *cc = CPU_GET_CLASS(cpu);
  40
  41         if (cc->get_arch_id(cpu) == id) {
  42             return true;
  43         }
  44     }
  45     return false;
  46 }
  47
  48 CPUState *cpu_generic_init(const char *typename, const char *cpu_model)
  49 {
  50     char *str, *name, *featurestr;
  51     CPUState *cpu = NULL;
  52     ObjectClass *oc;
  53     CPUClass *cc;
  54     Error *err = NULL;
  55
  56     str = g_strdup(cpu_model);
  57     name = strtok(str, ",");
  58
  59     oc = cpu_class_by_name(typename, name);
  60     if (oc == NULL) {
  61         g_free(str);
  62         return NULL;
  63     }
  64
  65     cc = CPU_CLASS(oc);
  66     featurestr = strtok(NULL, ",");
  67     /* TODO: all callers of cpu_generic_init() need to be converted to
  68      * call parse_features() only once, before calling cpu_generic_init().
  69      */
  70     cc->parse_features(object_class_get_name(oc), featurestr, &err);
  71     g_free(str);
  72     if (err != NULL) {
  73         goto out;
  74     }
  75
  76     cpu = CPU(object_new(object_class_get_name(oc)));
  77     object_property_set_bool(OBJECT(cpu), true, "realized", &err);
  78
  79 out:
  80     if (err != NULL) {
  81         error_report_err(err);
  82         object_unref(OBJECT(cpu));
  83         return NULL;
  84     }
  85
  86     return cpu;
  87 }
  88
  89 bool cpu_paging_enabled(const CPUState *cpu)
  90 {
  91     CPUClass *cc = CPU_GET_CLASS(cpu);
  92
  93     return cc->get_paging_enabled(cpu);
  94 }
  95
  96 static bool cpu_common_get_paging_enabled(const CPUState *cpu)
  97 {
  98     return false;
  99 }
 100
 101 void cpu_get_memory_mapping(CPUState *cpu, MemoryMappingList *list,
 102                             Error **errp)
 103 {
 104     CPUClass *cc = CPU_GET_CLASS(cpu);
 105
 106     cc->get_memory_mapping(cpu, list, errp);
 107 }
 108
 109 static void cpu_common_get_memory_mapping(CPUState *cpu,
 110                                           MemoryMappingList *list,
 111                                           Error **errp)
 112 {
 113     error_setg(errp, "Obtaining memory mappings is unsupported on this CPU.");
 114 }
 115
 116 /* Resetting the IRQ comes from across the code base so we take the
 117  * BQL here if we need to.  cpu_interrupt assumes it is held.*/
 118 void cpu_reset_interrupt(CPUState *cpu, int mask)
 119 {
 120     bool need_lock = !qemu_mutex_iothread_locked();
 121
 122     if (need_lock) {
 123         qemu_mutex_lock_iothread();
 124     }
 125     cpu->interrupt_request &= ~mask;
 126     if (need_lock) {
 127         qemu_mutex_unlock_iothread();
 128     }
 129 }
 130
 131 void cpu_exit(CPUState *cpu)
 132 {
 133     atomic_set(&cpu->exit_request, 1);
 134     /* Ensure cpu_exec will see the exit request after TCG has exited.  */
 135     smp_wmb();
 136     atomic_set(&cpu->icount_decr.u16.high, -1);
 137 }
 138
 139 int cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 140                              void *opaque)
 141 {
 142     CPUClass *cc = CPU_GET_CLASS(cpu);
 143
 144     return (*cc->write_elf32_qemunote)(f, cpu, opaque);
 145 }
 146
 147 static int cpu_common_write_elf32_qemunote(WriteCoreDumpFunction f,
 148                                            CPUState *cpu, void *opaque)
 149 {
 150     return 0;
 151 }
 152
 153 int cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cpu,
 154                          int cpuid, void *opaque)
 155 {
 156     CPUClass *cc = CPU_GET_CLASS(cpu);
 157
 158     return (*cc->write_elf32_note)(f, cpu, cpuid, opaque);
 159 }
 160
 161 static int cpu_common_write_elf32_note(WriteCoreDumpFunction f,
 162                                        CPUState *cpu, int cpuid,
 163                                        void *opaque)
 164 {
 165     return -1;
 166 }
 167
 168 int cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 169                              void *opaque)
 170 {
 171     CPUClass *cc = CPU_GET_CLASS(cpu);
 172
 173     return (*cc->write_elf64_qemunote)(f, cpu, opaque);
 174 }
 175
 176 static int cpu_common_write_elf64_qemunote(WriteCoreDumpFunction f,
 177                                            CPUState *cpu, void *opaque)
 178 {
 179     return 0;
 180 }
 181
 182 int cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cpu,
 183                          int cpuid, void *opaque)
 184 {
 185     CPUClass *cc = CPU_GET_CLASS(cpu);
 186
 187     return (*cc->write_elf64_note)(f, cpu, cpuid, opaque);
 188 }
 189
 190 static int cpu_common_write_elf64_note(WriteCoreDumpFunction f,
 191                                        CPUState *cpu, int cpuid,
 192                                        void *opaque)
 193 {
 194     return -1;
 195 }
 196
 197
 198 static int cpu_common_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg)
 199 {
 200     return 0;
 201 }
 202
 203 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
 204 {
 205     return 0;
 206 }
 207
 208 static bool cpu_common_debug_check_watchpoint(CPUState *cpu, CPUWatchpoint *wp)
 209 {
 210     /* If no extra check is required, QEMU watchpoint match can be considered
 211      * as an architectural match.
 212      */
 213     return true;
 214 }
 215
 216 bool target_words_bigendian(void);
 217 static bool cpu_common_virtio_is_big_endian(CPUState *cpu)
 218 {
 219     return target_words_bigendian();
 220 }
 221
 222 static void cpu_common_noop(CPUState *cpu)
 223 {
 224 }
 225
 226 static bool cpu_common_exec_interrupt(CPUState *cpu, int int_req)
 227 {
 228     return false;
 229 }
 230
 231 GuestPanicInformation *cpu_get_crash_info(CPUState *cpu)
 232 {
 233     CPUClass *cc = CPU_GET_CLASS(cpu);
 234     GuestPanicInformation *res = NULL;
 235
 236     if (cc->get_crash_info) {
 237         res = cc->get_crash_info(cpu);
 238     }
 239     return res;
 240 }
 241
 242 void cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
 243                     int flags)
 244 {
 245     CPUClass *cc = CPU_GET_CLASS(cpu);
 246
 247     if (cc->dump_state) {
 248         cpu_synchronize_state(cpu);
 249         cc->dump_state(cpu, f, cpu_fprintf, flags);
 250     }
 251 }
 252
 253 void cpu_dump_statistics(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
 254                          int flags)
 255 {
 256     CPUClass *cc = CPU_GET_CLASS(cpu);
 257
 258     if (cc->dump_statistics) {
 259         cc->dump_statistics(cpu, f, cpu_fprintf, flags);
 260     }
 261 }
 262
 263 void cpu_reset(CPUState *cpu)
 264 {
 265     CPUClass *klass = CPU_GET_CLASS(cpu);
 266
 267     if (klass->reset != NULL) {
 268         (*klass->reset)(cpu);
 269     }
 270
 271     trace_guest_cpu_reset(cpu);
 272 }
 273
 274 static void cpu_common_reset(CPUState *cpu)
 275 {
 276     CPUClass *cc = CPU_GET_CLASS(cpu);
 277     int i;
 278
 279     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
 280         qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
 281         log_cpu_state(cpu, cc->reset_dump_flags);
 282     }
 283
 284     cpu->interrupt_request = 0;
 285     cpu->halted = 0;
 286     cpu->mem_io_pc = 0;
 287     cpu->mem_io_vaddr = 0;
 288     cpu->icount_extra = 0;
 289     cpu->icount_decr.u32 = 0;
 290     cpu->can_do_io = 1;
 291     cpu->exception_index = -1;
 292     cpu->crash_occurred = false;
 293
 294     if (tcg_enabled()) {
 295         for (i = 0; i < TB_JMP_CACHE_SIZE; ++i) {
 296             atomic_set(&cpu->tb_jmp_cache[i], NULL);
 297         }
 298
 299 #ifdef CONFIG_SOFTMMU
 300         tlb_flush(cpu, 0);
 301 #endif
 302     }
 303 }
 304
 305 static bool cpu_common_has_work(CPUState *cs)
 306 {
 307     return false;
 308 }
 309
 310 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
 311 {
 312     CPUClass *cc = CPU_CLASS(object_class_by_name(typename));
 313
 314     return cc->class_by_name(cpu_model);
 315 }
 316
 317 static ObjectClass *cpu_common_class_by_name(const char *cpu_model)
 318 {
 319     return NULL;
 320 }
 321
 322 static void cpu_common_parse_features(const char *typename, char *features,
 323                                       Error **errp)
 324 {
 325     char *featurestr; /* Single "key=value" string being parsed */
 326     char *val;
 327     static bool cpu_globals_initialized;
 328
 329     /* TODO: all callers of ->parse_features() need to be changed to
 330      * call it only once, so we can remove this check (or change it
 331      * to assert(!cpu_globals_initialized).
 332      * Current callers of ->parse_features() are:
 333      * - cpu_generic_init()
 334      */
 335     if (cpu_globals_initialized) {
 336         return;
 337     }
 338     cpu_globals_initialized = true;
 339
 340     featurestr = features ? strtok(features, ",") : NULL;
 341
 342     while (featurestr) {
 343         val = strchr(featurestr, '=');
 344         if (val) {
 345             GlobalProperty *prop = g_new0(typeof(*prop), 1);
 346             *val = 0;
 347             val++;
 348             prop->driver = typename;
 349             prop->property = g_strdup(featurestr);
 350             prop->value = g_strdup(val);
 351             prop->errp = &error_fatal;
 352             qdev_prop_register_global(prop);
 353         } else {
 354             error_setg(errp, "Expected key=value format, found %s.",
 355                        featurestr);
 356             return;
 357         }
 358         featurestr = strtok(NULL, ",");
 359     }
 360 }
 361
 362 static void cpu_common_realizefn(DeviceState *dev, Error **errp)
 363 {
 364     CPUState *cpu = CPU(dev);
 365
 366     if (dev->hotplugged) {
 367         cpu_synchronize_post_init(cpu);
 368         cpu_resume(cpu);
 369     }
 370
 371     /* NOTE: latest generic point where the cpu is fully realized */
 372     trace_init_vcpu(cpu);
 373 }
 374
 375 static void cpu_common_unrealizefn(DeviceState *dev, Error **errp)
 376 {
 377     CPUState *cpu = CPU(dev);
 378     /* NOTE: latest generic point before the cpu is fully unrealized */
 379     trace_fini_vcpu(cpu);
 380     cpu_exec_unrealizefn(cpu);
 381 }
 382
 383 static void cpu_common_initfn(Object *obj)
 384 {
 385     uint32_t count;
 386     CPUState *cpu = CPU(obj);
 387     CPUClass *cc = CPU_GET_CLASS(obj);
 388
 389     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
 390     cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
 391     /* *-user doesn't have configurable SMP topology */
 392     /* the default value is changed by qemu_init_vcpu() for softmmu */
 393     cpu->nr_cores = 1;
 394     cpu->nr_threads = 1;
 395
 396     qemu_mutex_init(&cpu->work_mutex);
 397     QTAILQ_INIT(&cpu->breakpoints);
 398     QTAILQ_INIT(&cpu->watchpoints);
 399
 400     count = trace_get_vcpu_event_count();
 401     if (count) {
 402         cpu->trace_dstate = bitmap_new(count);
 403     }
 404
 405     cpu_exec_initfn(cpu);
 406 }
 407
 408 static void cpu_common_finalize(Object *obj)
 409 {
 410     CPUState *cpu = CPU(obj);
 411     g_free(cpu->trace_dstate);
 412 }
 413
 414 static int64_t cpu_common_get_arch_id(CPUState *cpu)
 415 {
 416     return cpu->cpu_index;
 417 }
 418
 419 static vaddr cpu_adjust_watchpoint_address(CPUState *cpu, vaddr addr, int len)
 420 {
 421     return addr;
 422 }
 423
 424 static void cpu_class_init(ObjectClass *klass, void *data)
 425 {
 426     DeviceClass *dc = DEVICE_CLASS(klass);
 427     CPUClass *k = CPU_CLASS(klass);
 428
 429     k->class_by_name = cpu_common_class_by_name;
 430     k->parse_features = cpu_common_parse_features;
 431     k->reset = cpu_common_reset;
 432     k->get_arch_id = cpu_common_get_arch_id;
 433     k->has_work = cpu_common_has_work;
 434     k->get_paging_enabled = cpu_common_get_paging_enabled;
 435     k->get_memory_mapping = cpu_common_get_memory_mapping;
 436     k->write_elf32_qemunote = cpu_common_write_elf32_qemunote;
 437     k->write_elf32_note = cpu_common_write_elf32_note;
 438     k->write_elf64_qemunote = cpu_common_write_elf64_qemunote;
 439     k->write_elf64_note = cpu_common_write_elf64_note;
 440     k->gdb_read_register = cpu_common_gdb_read_register;
 441     k->gdb_write_register = cpu_common_gdb_write_register;
 442     k->virtio_is_big_endian = cpu_common_virtio_is_big_endian;
 443     k->debug_excp_handler = cpu_common_noop;
 444     k->debug_check_watchpoint = cpu_common_debug_check_watchpoint;
 445     k->cpu_exec_enter = cpu_common_noop;
 446     k->cpu_exec_exit = cpu_common_noop;
 447     k->cpu_exec_interrupt = cpu_common_exec_interrupt;
 448     k->adjust_watchpoint_address = cpu_adjust_watchpoint_address;
 449     set_bit(DEVICE_CATEGORY_CPU, dc->categories);
 450     dc->realize = cpu_common_realizefn;
 451     dc->unrealize = cpu_common_unrealizefn;
 452     /*
 453      * Reason: CPUs still need special care by board code: wiring up
 454      * IRQs, adding reset handlers, halting non-first CPUs, ...
 455      */
 456     dc->user_creatable = false;
 457 }
 458
 459 static const TypeInfo cpu_type_info = {
 460     .name = TYPE_CPU,
 461     .parent = TYPE_DEVICE,
 462     .instance_size = sizeof(CPUState),
 463     .instance_init = cpu_common_initfn,
 464     .instance_finalize = cpu_common_finalize,
 465     .abstract = true,
 466     .class_size = sizeof(CPUClass),
 467     .class_init = cpu_class_init,
 468 };
 469
 470 static void cpu_register_types(void)
 471 {
 472     type_register_static(&cpu_type_info);
 473 }
 474
 475 type_init(cpu_register_types)