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