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/qdev-properties.h"
  33 #include "trace-root.h"
  34
  35 CPUInterruptHandler cpu_interrupt_handler;
  36
  37 bool cpu_exists(int64_t id)
  38 {
  39     CPUState *cpu;
  40
  41     CPU_FOREACH(cpu) {
  42         CPUClass *cc = CPU_GET_CLASS(cpu);
  43
  44         if (cc->get_arch_id(cpu) == id) {
  45             return true;
  46         }
  47     }
  48     return false;
  49 }
  50
  51 CPUState *cpu_generic_init(const char *typename, const char *cpu_model)
  52 {
  53     char *str, *name, *featurestr;
  54     CPUState *cpu = NULL;
  55     ObjectClass *oc;
  56     CPUClass *cc;
  57     Error *err = NULL;
  58
  59     str = g_strdup(cpu_model);
  60     name = strtok(str, ",");
  61
  62     oc = cpu_class_by_name(typename, name);
  63     if (oc == NULL) {
  64         g_free(str);
  65         return NULL;
  66     }
  67
  68     cc = CPU_CLASS(oc);
  69     featurestr = strtok(NULL, ",");
  70     /* TODO: all callers of cpu_generic_init() need to be converted to
  71      * call parse_features() only once, before calling cpu_generic_init().
  72      */
  73     cc->parse_features(object_class_get_name(oc), featurestr, &err);
  74     g_free(str);
  75     if (err != NULL) {
  76         goto out;
  77     }
  78
  79     cpu = CPU(object_new(object_class_get_name(oc)));
  80     object_property_set_bool(OBJECT(cpu), true, "realized", &err);
  81
  82 out:
  83     if (err != NULL) {
  84         error_report_err(err);
  85         object_unref(OBJECT(cpu));
  86         return NULL;
  87     }
  88
  89     return cpu;
  90 }
  91
  92 bool cpu_paging_enabled(const CPUState *cpu)
  93 {
  94     CPUClass *cc = CPU_GET_CLASS(cpu);
  95
  96     return cc->get_paging_enabled(cpu);
  97 }
  98
  99 static bool cpu_common_get_paging_enabled(const CPUState *cpu)
 100 {
 101     return false;
 102 }
 103
 104 void cpu_get_memory_mapping(CPUState *cpu, MemoryMappingList *list,
 105                             Error **errp)
 106 {
 107     CPUClass *cc = CPU_GET_CLASS(cpu);
 108
 109     cc->get_memory_mapping(cpu, list, errp);
 110 }
 111
 112 static void cpu_common_get_memory_mapping(CPUState *cpu,
 113                                           MemoryMappingList *list,
 114                                           Error **errp)
 115 {
 116     error_setg(errp, "Obtaining memory mappings is unsupported on this CPU.");
 117 }
 118
 119 /* Resetting the IRQ comes from across the code base so we take the
 120  * BQL here if we need to.  cpu_interrupt assumes it is held.*/
 121 void cpu_reset_interrupt(CPUState *cpu, int mask)
 122 {
 123     bool need_lock = !qemu_mutex_iothread_locked();
 124
 125     if (need_lock) {
 126         qemu_mutex_lock_iothread();
 127     }
 128     cpu->interrupt_request &= ~mask;
 129     if (need_lock) {
 130         qemu_mutex_unlock_iothread();
 131     }
 132 }
 133
 134 void cpu_exit(CPUState *cpu)
 135 {
 136     atomic_set(&cpu->exit_request, 1);
 137     /* Ensure cpu_exec will see the exit request after TCG has exited.  */
 138     smp_wmb();
 139     atomic_set(&cpu->icount_decr.u16.high, -1);
 140 }
 141
 142 int cpu_write_elf32_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 143                              void *opaque)
 144 {
 145     CPUClass *cc = CPU_GET_CLASS(cpu);
 146
 147     return (*cc->write_elf32_qemunote)(f, cpu, opaque);
 148 }
 149
 150 static int cpu_common_write_elf32_qemunote(WriteCoreDumpFunction f,
 151                                            CPUState *cpu, void *opaque)
 152 {
 153     return 0;
 154 }
 155
 156 int cpu_write_elf32_note(WriteCoreDumpFunction f, CPUState *cpu,
 157                          int cpuid, void *opaque)
 158 {
 159     CPUClass *cc = CPU_GET_CLASS(cpu);
 160
 161     return (*cc->write_elf32_note)(f, cpu, cpuid, opaque);
 162 }
 163
 164 static int cpu_common_write_elf32_note(WriteCoreDumpFunction f,
 165                                        CPUState *cpu, int cpuid,
 166                                        void *opaque)
 167 {
 168     return -1;
 169 }
 170
 171 int cpu_write_elf64_qemunote(WriteCoreDumpFunction f, CPUState *cpu,
 172                              void *opaque)
 173 {
 174     CPUClass *cc = CPU_GET_CLASS(cpu);
 175
 176     return (*cc->write_elf64_qemunote)(f, cpu, opaque);
 177 }
 178
 179 static int cpu_common_write_elf64_qemunote(WriteCoreDumpFunction f,
 180                                            CPUState *cpu, void *opaque)
 181 {
 182     return 0;
 183 }
 184
 185 int cpu_write_elf64_note(WriteCoreDumpFunction f, CPUState *cpu,
 186                          int cpuid, void *opaque)
 187 {
 188     CPUClass *cc = CPU_GET_CLASS(cpu);
 189
 190     return (*cc->write_elf64_note)(f, cpu, cpuid, opaque);
 191 }
 192
 193 static int cpu_common_write_elf64_note(WriteCoreDumpFunction f,
 194                                        CPUState *cpu, int cpuid,
 195                                        void *opaque)
 196 {
 197     return -1;
 198 }
 199
 200
 201 static int cpu_common_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg)
 202 {
 203     return 0;
 204 }
 205
 206 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg)
 207 {
 208     return 0;
 209 }
 210
 211 static bool cpu_common_debug_check_watchpoint(CPUState *cpu, CPUWatchpoint *wp)
 212 {
 213     /* If no extra check is required, QEMU watchpoint match can be considered
 214      * as an architectural match.
 215      */
 216     return true;
 217 }
 218
 219 bool target_words_bigendian(void);
 220 static bool cpu_common_virtio_is_big_endian(CPUState *cpu)
 221 {
 222     return target_words_bigendian();
 223 }
 224
 225 static void cpu_common_noop(CPUState *cpu)
 226 {
 227 }
 228
 229 static bool cpu_common_exec_interrupt(CPUState *cpu, int int_req)
 230 {
 231     return false;
 232 }
 233
 234 GuestPanicInformation *cpu_get_crash_info(CPUState *cpu)
 235 {
 236     CPUClass *cc = CPU_GET_CLASS(cpu);
 237     GuestPanicInformation *res = NULL;
 238
 239     if (cc->get_crash_info) {
 240         res = cc->get_crash_info(cpu);
 241     }
 242     return res;
 243 }
 244
 245 void cpu_dump_state(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
 246                     int flags)
 247 {
 248     CPUClass *cc = CPU_GET_CLASS(cpu);
 249
 250     if (cc->dump_state) {
 251         cpu_synchronize_state(cpu);
 252         cc->dump_state(cpu, f, cpu_fprintf, flags);
 253     }
 254 }
 255
 256 void cpu_dump_statistics(CPUState *cpu, FILE *f, fprintf_function cpu_fprintf,
 257                          int flags)
 258 {
 259     CPUClass *cc = CPU_GET_CLASS(cpu);
 260
 261     if (cc->dump_statistics) {
 262         cc->dump_statistics(cpu, f, cpu_fprintf, flags);
 263     }
 264 }
 265
 266 void cpu_reset(CPUState *cpu)
 267 {
 268     CPUClass *klass = CPU_GET_CLASS(cpu);
 269
 270     if (klass->reset != NULL) {
 271         (*klass->reset)(cpu);
 272     }
 273
 274     trace_guest_cpu_reset(cpu);
 275 }
 276
 277 static void cpu_common_reset(CPUState *cpu)
 278 {
 279     CPUClass *cc = CPU_GET_CLASS(cpu);
 280
 281     if (qemu_loglevel_mask(CPU_LOG_RESET)) {
 282         qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index);
 283         log_cpu_state(cpu, cc->reset_dump_flags);
 284     }
 285
 286     cpu->interrupt_request = 0;
 287     cpu->halted = 0;
 288     cpu->mem_io_pc = 0;
 289     cpu->mem_io_vaddr = 0;
 290     cpu->icount_extra = 0;
 291     cpu->icount_decr.u32 = 0;
 292     cpu->can_do_io = 1;
 293     cpu->exception_index = -1;
 294     cpu->crash_occurred = false;
 295
 296     if (tcg_enabled()) {
 297         cpu_tb_jmp_cache_clear(cpu);
 298
 299         tcg_flush_softmmu_tlb(cpu);
 300     }
 301 }
 302
 303 static bool cpu_common_has_work(CPUState *cs)
 304 {
 305     return false;
 306 }
 307
 308 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model)
 309 {
 310     CPUClass *cc = CPU_CLASS(object_class_by_name(typename));
 311
 312     return cc->class_by_name(cpu_model);
 313 }
 314
 315 static ObjectClass *cpu_common_class_by_name(const char *cpu_model)
 316 {
 317     return NULL;
 318 }
 319
 320 static void cpu_common_parse_features(const char *typename, char *features,
 321                                       Error **errp)
 322 {
 323     char *featurestr; /* Single "key=value" string being parsed */
 324     char *val;
 325     static bool cpu_globals_initialized;
 326
 327     /* TODO: all callers of ->parse_features() need to be changed to
 328      * call it only once, so we can remove this check (or change it
 329      * to assert(!cpu_globals_initialized).
 330      * Current callers of ->parse_features() are:
 331      * - cpu_generic_init()
 332      */
 333     if (cpu_globals_initialized) {
 334         return;
 335     }
 336     cpu_globals_initialized = true;
 337
 338     featurestr = features ? strtok(features, ",") : NULL;
 339
 340     while (featurestr) {
 341         val = strchr(featurestr, '=');
 342         if (val) {
 343             GlobalProperty *prop = g_new0(typeof(*prop), 1);
 344             *val = 0;
 345             val++;
 346             prop->driver = typename;
 347             prop->property = g_strdup(featurestr);
 348             prop->value = g_strdup(val);
 349             prop->errp = &error_fatal;
 350             qdev_prop_register_global(prop);
 351         } else {
 352             error_setg(errp, "Expected key=value format, found %s.",
 353                        featurestr);
 354             return;
 355         }
 356         featurestr = strtok(NULL, ",");
 357     }
 358 }
 359
 360 static void cpu_common_realizefn(DeviceState *dev, Error **errp)
 361 {
 362     CPUState *cpu = CPU(dev);
 363
 364     if (dev->hotplugged) {
 365         cpu_synchronize_post_init(cpu);
 366         cpu_resume(cpu);
 367     }
 368
 369     /* NOTE: latest generic point where the cpu is fully realized */
 370     trace_init_vcpu(cpu);
 371 }
 372
 373 static void cpu_common_unrealizefn(DeviceState *dev, Error **errp)
 374 {
 375     CPUState *cpu = CPU(dev);
 376     /* NOTE: latest generic point before the cpu is fully unrealized */
 377     trace_fini_vcpu(cpu);
 378     cpu_exec_unrealizefn(cpu);
 379 }
 380
 381 static void cpu_common_initfn(Object *obj)
 382 {
 383     uint32_t count;
 384     CPUState *cpu = CPU(obj);
 385     CPUClass *cc = CPU_GET_CLASS(obj);
 386
 387     cpu->cpu_index = UNASSIGNED_CPU_INDEX;
 388     cpu->gdb_num_regs = cpu->gdb_num_g_regs = cc->gdb_num_core_regs;
 389     /* *-user doesn't have configurable SMP topology */
 390     /* the default value is changed by qemu_init_vcpu() for softmmu */
 391     cpu->nr_cores = 1;
 392     cpu->nr_threads = 1;
 393
 394     qemu_mutex_init(&cpu->work_mutex);
 395     QTAILQ_INIT(&cpu->breakpoints);
 396     QTAILQ_INIT(&cpu->watchpoints);
 397
 398     count = trace_get_vcpu_event_count();
 399     if (count) {
 400         cpu->trace_dstate = bitmap_new(count);
 401     }
 402
 403     cpu_exec_initfn(cpu);
 404 }
 405
 406 static void cpu_common_finalize(Object *obj)
 407 {
 408     CPUState *cpu = CPU(obj);
 409     g_free(cpu->trace_dstate);
 410 }
 411
 412 static int64_t cpu_common_get_arch_id(CPUState *cpu)
 413 {
 414     return cpu->cpu_index;
 415 }
 416
 417 static vaddr cpu_adjust_watchpoint_address(CPUState *cpu, vaddr addr, int len)
 418 {
 419     return addr;
 420 }
 421
 422 static void generic_handle_interrupt(CPUState *cpu, int mask)
 423 {
 424     cpu->interrupt_request |= mask;
 425
 426     if (!qemu_cpu_is_self(cpu)) {
 427         qemu_cpu_kick(cpu);
 428     }
 429 }
 430
 431 CPUInterruptHandler cpu_interrupt_handler = generic_handle_interrupt;
 432
 433 static void cpu_class_init(ObjectClass *klass, void *data)
 434 {
 435     DeviceClass *dc = DEVICE_CLASS(klass);
 436     CPUClass *k = CPU_CLASS(klass);
 437
 438     k->class_by_name = cpu_common_class_by_name;
 439     k->parse_features = cpu_common_parse_features;
 440     k->reset = cpu_common_reset;
 441     k->get_arch_id = cpu_common_get_arch_id;
 442     k->has_work = cpu_common_has_work;
 443     k->get_paging_enabled = cpu_common_get_paging_enabled;
 444     k->get_memory_mapping = cpu_common_get_memory_mapping;
 445     k->write_elf32_qemunote = cpu_common_write_elf32_qemunote;
 446     k->write_elf32_note = cpu_common_write_elf32_note;
 447     k->write_elf64_qemunote = cpu_common_write_elf64_qemunote;
 448     k->write_elf64_note = cpu_common_write_elf64_note;
 449     k->gdb_read_register = cpu_common_gdb_read_register;
 450     k->gdb_write_register = cpu_common_gdb_write_register;
 451     k->virtio_is_big_endian = cpu_common_virtio_is_big_endian;
 452     k->debug_excp_handler = cpu_common_noop;
 453     k->debug_check_watchpoint = cpu_common_debug_check_watchpoint;
 454     k->cpu_exec_enter = cpu_common_noop;
 455     k->cpu_exec_exit = cpu_common_noop;
 456     k->cpu_exec_interrupt = cpu_common_exec_interrupt;
 457     k->adjust_watchpoint_address = cpu_adjust_watchpoint_address;
 458     set_bit(DEVICE_CATEGORY_CPU, dc->categories);
 459     dc->realize = cpu_common_realizefn;
 460     dc->unrealize = cpu_common_unrealizefn;
 461     /*
 462      * Reason: CPUs still need special care by board code: wiring up
 463      * IRQs, adding reset handlers, halting non-first CPUs, ...
 464      */
 465     dc->user_creatable = false;
 466 }
 467
 468 static const TypeInfo cpu_type_info = {
 469     .name = TYPE_CPU,
 470     .parent = TYPE_DEVICE,
 471     .instance_size = sizeof(CPUState),
 472     .instance_init = cpu_common_initfn,
 473     .instance_finalize = cpu_common_finalize,
 474     .abstract = true,
 475     .class_size = sizeof(CPUClass),
 476     .class_init = cpu_class_init,
 477 };
 478
 479 static void cpu_register_types(void)
 480 {
 481     type_register_static(&cpu_type_info);
 482 }
 483
 484 type_init(cpu_register_types)