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 "hw/core/cpu.h" 24 #include "system/hw_accel.h" 25 #include "qemu/log.h" 26 #include "qemu/main-loop.h" 27 #include "qemu/lockcnt.h" 28 #include "exec/log.h" 29 #include "exec/gdbstub.h" 30 #include "system/tcg.h" 31 #include "hw/boards.h" 32 #include "hw/qdev-properties.h" 33 #include "trace.h" 34 #ifdef CONFIG_PLUGIN 35 #include "qemu/plugin.h" 36 #endif 37 38 CPUState *cpu_by_arch_id(int64_t id) 39 { 40 CPUState *cpu; 41 42 CPU_FOREACH(cpu) { 43 if (cpu->cc->get_arch_id(cpu) == id) { 44 return cpu; 45 } 46 } 47 return NULL; 48 } 49 50 bool cpu_exists(int64_t id) 51 { 52 return !!cpu_by_arch_id(id); 53 } 54 55 CPUState *cpu_create(const char *typename) 56 { 57 Error *err = NULL; 58 CPUState *cpu = CPU(object_new(typename)); 59 if (!qdev_realize(DEVICE(cpu), NULL, &err)) { 60 error_report_err(err); 61 object_unref(OBJECT(cpu)); 62 exit(EXIT_FAILURE); 63 } 64 return cpu; 65 } 66 67 /* Resetting the IRQ comes from across the code base so we take the 68 * BQL here if we need to. cpu_interrupt assumes it is held.*/ 69 void cpu_reset_interrupt(CPUState *cpu, int mask) 70 { 71 bool need_lock = !bql_locked(); 72 73 if (need_lock) { 74 bql_lock(); 75 } 76 cpu->interrupt_request &= ~mask; 77 if (need_lock) { 78 bql_unlock(); 79 } 80 } 81 82 void cpu_exit(CPUState *cpu) 83 { 84 qatomic_set(&cpu->exit_request, 1); 85 /* Ensure cpu_exec will see the exit request after TCG has exited. */ 86 smp_wmb(); 87 qatomic_set(&cpu->neg.icount_decr.u16.high, -1); 88 } 89 90 static int cpu_common_gdb_read_register(CPUState *cpu, GByteArray *buf, int reg) 91 { 92 return 0; 93 } 94 95 static int cpu_common_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg) 96 { 97 return 0; 98 } 99 100 void cpu_dump_state(CPUState *cpu, FILE *f, int flags) 101 { 102 if (cpu->cc->dump_state) { 103 cpu_synchronize_state(cpu); 104 cpu->cc->dump_state(cpu, f, flags); 105 } 106 } 107 108 void cpu_reset(CPUState *cpu) 109 { 110 device_cold_reset(DEVICE(cpu)); 111 112 trace_cpu_reset(cpu->cpu_index); 113 } 114 115 static void cpu_common_reset_hold(Object *obj, ResetType type) 116 { 117 CPUState *cpu = CPU(obj); 118 119 if (qemu_loglevel_mask(CPU_LOG_RESET)) { 120 qemu_log("CPU Reset (CPU %d)\n", cpu->cpu_index); 121 log_cpu_state(cpu, cpu->cc->reset_dump_flags); 122 } 123 124 cpu->interrupt_request = 0; 125 cpu->halted = cpu->start_powered_off; 126 cpu->mem_io_pc = 0; 127 cpu->icount_extra = 0; 128 qatomic_set(&cpu->neg.icount_decr.u32, 0); 129 cpu->neg.can_do_io = true; 130 cpu->exception_index = -1; 131 cpu->crash_occurred = false; 132 cpu->cflags_next_tb = -1; 133 134 cpu_exec_reset_hold(cpu); 135 } 136 137 ObjectClass *cpu_class_by_name(const char *typename, const char *cpu_model) 138 { 139 ObjectClass *oc; 140 CPUClass *cc; 141 142 oc = object_class_by_name(typename); 143 cc = CPU_CLASS(oc); 144 assert(cc->class_by_name); 145 assert(cpu_model); 146 oc = cc->class_by_name(cpu_model); 147 if (object_class_dynamic_cast(oc, typename) && 148 !object_class_is_abstract(oc)) { 149 return oc; 150 } 151 152 return NULL; 153 } 154 155 static void cpu_common_parse_features(const char *typename, char *features, 156 Error **errp) 157 { 158 char *val; 159 static bool cpu_globals_initialized; 160 /* Single "key=value" string being parsed */ 161 char *featurestr = features ? strtok(features, ",") : NULL; 162 163 /* should be called only once, catch invalid users */ 164 assert(!cpu_globals_initialized); 165 cpu_globals_initialized = true; 166 167 while (featurestr) { 168 val = strchr(featurestr, '='); 169 if (val) { 170 GlobalProperty *prop = g_new0(typeof(*prop), 1); 171 *val = 0; 172 val++; 173 prop->driver = typename; 174 prop->property = g_strdup(featurestr); 175 prop->value = g_strdup(val); 176 qdev_prop_register_global(prop); 177 } else { 178 error_setg(errp, "Expected key=value format, found %s.", 179 featurestr); 180 return; 181 } 182 featurestr = strtok(NULL, ","); 183 } 184 } 185 186 bool cpu_exec_realizefn(CPUState *cpu, Error **errp) 187 { 188 if (!accel_cpu_common_realize(cpu, errp)) { 189 return false; 190 } 191 192 /* Wait until cpu initialization complete before exposing cpu. */ 193 cpu_list_add(cpu); 194 195 cpu_vmstate_register(cpu); 196 197 return true; 198 } 199 200 static void cpu_common_realizefn(DeviceState *dev, Error **errp) 201 { 202 CPUState *cpu = CPU(dev); 203 Object *machine = qdev_get_machine(); 204 205 /* qdev_get_machine() can return something that's not TYPE_MACHINE 206 * if this is one of the user-only emulators; in that case there's 207 * no need to check the ignore_memory_transaction_failures board flag. 208 */ 209 if (object_dynamic_cast(machine, TYPE_MACHINE)) { 210 MachineClass *mc = MACHINE_GET_CLASS(machine); 211 212 if (mc) { 213 cpu->ignore_memory_transaction_failures = 214 mc->ignore_memory_transaction_failures; 215 } 216 } 217 218 if (dev->hotplugged) { 219 cpu_synchronize_post_init(cpu); 220 cpu_resume(cpu); 221 } 222 223 /* NOTE: latest generic point where the cpu is fully realized */ 224 } 225 226 static void cpu_common_unrealizefn(DeviceState *dev) 227 { 228 CPUState *cpu = CPU(dev); 229 230 /* Call the plugin hook before clearing the cpu is fully unrealized */ 231 #ifdef CONFIG_PLUGIN 232 if (tcg_enabled()) { 233 qemu_plugin_vcpu_exit_hook(cpu); 234 } 235 #endif 236 237 /* NOTE: latest generic point before the cpu is fully unrealized */ 238 cpu_exec_unrealizefn(cpu); 239 } 240 241 void cpu_exec_unrealizefn(CPUState *cpu) 242 { 243 cpu_vmstate_unregister(cpu); 244 245 cpu_list_remove(cpu); 246 /* 247 * Now that the vCPU has been removed from the RCU list, we can call 248 * accel_cpu_common_unrealize, which may free fields using call_rcu. 249 */ 250 accel_cpu_common_unrealize(cpu); 251 } 252 253 static void cpu_common_initfn(Object *obj) 254 { 255 CPUState *cpu = CPU(obj); 256 257 cpu_exec_class_post_init(CPU_GET_CLASS(obj)); 258 259 /* cache the cpu class for the hotpath */ 260 cpu->cc = CPU_GET_CLASS(cpu); 261 262 gdb_init_cpu(cpu); 263 cpu->cpu_index = UNASSIGNED_CPU_INDEX; 264 cpu->cluster_index = UNASSIGNED_CLUSTER_INDEX; 265 cpu->as = NULL; 266 cpu->num_ases = 0; 267 /* user-mode doesn't have configurable SMP topology */ 268 /* the default value is changed by qemu_init_vcpu() for system-mode */ 269 cpu->nr_threads = 1; 270 271 /* allocate storage for thread info, initialise condition variables */ 272 cpu->thread = g_new0(QemuThread, 1); 273 cpu->halt_cond = g_new0(QemuCond, 1); 274 qemu_cond_init(cpu->halt_cond); 275 276 qemu_mutex_init(&cpu->work_mutex); 277 qemu_lockcnt_init(&cpu->in_ioctl_lock); 278 QSIMPLEQ_INIT(&cpu->work_list); 279 QTAILQ_INIT(&cpu->breakpoints); 280 QTAILQ_INIT(&cpu->watchpoints); 281 282 cpu_exec_initfn(cpu); 283 284 /* 285 * Plugin initialization must wait until the cpu start executing 286 * code, but we must queue this work before the threads are 287 * created to ensure we don't race. 288 */ 289 #ifdef CONFIG_PLUGIN 290 if (tcg_enabled()) { 291 cpu->plugin_state = qemu_plugin_create_vcpu_state(); 292 qemu_plugin_vcpu_init_hook(cpu); 293 } 294 #endif 295 } 296 297 static void cpu_common_finalize(Object *obj) 298 { 299 CPUState *cpu = CPU(obj); 300 301 #ifdef CONFIG_PLUGIN 302 if (tcg_enabled()) { 303 g_free(cpu->plugin_state); 304 } 305 #endif 306 free_queued_cpu_work(cpu); 307 /* If cleanup didn't happen in context to gdb_unregister_coprocessor_all */ 308 if (cpu->gdb_regs) { 309 g_array_free(cpu->gdb_regs, TRUE); 310 } 311 qemu_lockcnt_destroy(&cpu->in_ioctl_lock); 312 qemu_mutex_destroy(&cpu->work_mutex); 313 qemu_cond_destroy(cpu->halt_cond); 314 g_free(cpu->halt_cond); 315 g_free(cpu->thread); 316 } 317 318 static int64_t cpu_common_get_arch_id(CPUState *cpu) 319 { 320 return cpu->cpu_index; 321 } 322 323 static void cpu_common_class_init(ObjectClass *klass, void *data) 324 { 325 DeviceClass *dc = DEVICE_CLASS(klass); 326 ResettableClass *rc = RESETTABLE_CLASS(klass); 327 CPUClass *k = CPU_CLASS(klass); 328 329 k->parse_features = cpu_common_parse_features; 330 k->get_arch_id = cpu_common_get_arch_id; 331 k->gdb_read_register = cpu_common_gdb_read_register; 332 k->gdb_write_register = cpu_common_gdb_write_register; 333 set_bit(DEVICE_CATEGORY_CPU, dc->categories); 334 dc->realize = cpu_common_realizefn; 335 dc->unrealize = cpu_common_unrealizefn; 336 rc->phases.hold = cpu_common_reset_hold; 337 cpu_class_init_props(dc); 338 /* 339 * Reason: CPUs still need special care by board code: wiring up 340 * IRQs, adding reset handlers, halting non-first CPUs, ... 341 */ 342 dc->user_creatable = false; 343 } 344 345 static const TypeInfo cpu_type_info = { 346 .name = TYPE_CPU, 347 .parent = TYPE_DEVICE, 348 .instance_size = sizeof(CPUState), 349 .instance_init = cpu_common_initfn, 350 .instance_finalize = cpu_common_finalize, 351 .abstract = true, 352 .class_size = sizeof(CPUClass), 353 .class_init = cpu_common_class_init, 354 }; 355 356 static void cpu_register_types(void) 357 { 358 type_register_static(&cpu_type_info); 359 } 360 361 type_init(cpu_register_types) 362