hw/acpi/cpu.c

   1 #include "qemu/osdep.h"
   2 #include "hw/boards.h"
   3 #include "hw/acpi/cpu.h"
   4 #include "qapi/error.h"
   5 #include "qapi/qapi-events-misc.h"
   6 #include "trace.h"
   7 #include "sysemu/numa.h"
   8
   9 #define ACPI_CPU_HOTPLUG_REG_LEN 12
  10 #define ACPI_CPU_SELECTOR_OFFSET_WR 0
  11 #define ACPI_CPU_FLAGS_OFFSET_RW 4
  12 #define ACPI_CPU_CMD_OFFSET_WR 5
  13 #define ACPI_CPU_CMD_DATA_OFFSET_RW 8
  14
  15 enum {
  16     CPHP_GET_NEXT_CPU_WITH_EVENT_CMD = 0,
  17     CPHP_OST_EVENT_CMD = 1,
  18     CPHP_OST_STATUS_CMD = 2,
  19     CPHP_CMD_MAX
  20 };
  21
  22 static ACPIOSTInfo *acpi_cpu_device_status(int idx, AcpiCpuStatus *cdev)
  23 {
  24     ACPIOSTInfo *info = g_new0(ACPIOSTInfo, 1);
  25
  26     info->slot_type = ACPI_SLOT_TYPE_CPU;
  27     info->slot = g_strdup_printf("%d", idx);
  28     info->source = cdev->ost_event;
  29     info->status = cdev->ost_status;
  30     if (cdev->cpu) {
  31         DeviceState *dev = DEVICE(cdev->cpu);
  32         if (dev->id) {
  33             info->device = g_strdup(dev->id);
  34             info->has_device = true;
  35         }
  36     }
  37     return info;
  38 }
  39
  40 void acpi_cpu_ospm_status(CPUHotplugState *cpu_st, ACPIOSTInfoList ***list)
  41 {
  42     int i;
  43
  44     for (i = 0; i < cpu_st->dev_count; i++) {
  45         ACPIOSTInfoList *elem = g_new0(ACPIOSTInfoList, 1);
  46         elem->value = acpi_cpu_device_status(i, &cpu_st->devs[i]);
  47         elem->next = NULL;
  48         **list = elem;
  49         *list = &elem->next;
  50     }
  51 }
  52
  53 static uint64_t cpu_hotplug_rd(void *opaque, hwaddr addr, unsigned size)
  54 {
  55     uint64_t val = 0;
  56     CPUHotplugState *cpu_st = opaque;
  57     AcpiCpuStatus *cdev;
  58
  59     if (cpu_st->selector >= cpu_st->dev_count) {
  60         return val;
  61     }
  62
  63     cdev = &cpu_st->devs[cpu_st->selector];
  64     switch (addr) {
  65     case ACPI_CPU_FLAGS_OFFSET_RW: /* pack and return is_* fields */
  66         val |= cdev->cpu ? 1 : 0;
  67         val |= cdev->is_inserting ? 2 : 0;
  68         val |= cdev->is_removing  ? 4 : 0;
  69         trace_cpuhp_acpi_read_flags(cpu_st->selector, val);
  70         break;
  71     case ACPI_CPU_CMD_DATA_OFFSET_RW:
  72         switch (cpu_st->command) {
  73         case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
  74            val = cpu_st->selector;
  75            break;
  76         default:
  77            break;
  78         }
  79         trace_cpuhp_acpi_read_cmd_data(cpu_st->selector, val);
  80         break;
  81     default:
  82         break;
  83     }
  84     return val;
  85 }
  86
  87 static void cpu_hotplug_wr(void *opaque, hwaddr addr, uint64_t data,
  88                            unsigned int size)
  89 {
  90     CPUHotplugState *cpu_st = opaque;
  91     AcpiCpuStatus *cdev;
  92     ACPIOSTInfo *info;
  93
  94     assert(cpu_st->dev_count);
  95
  96     if (addr) {
  97         if (cpu_st->selector >= cpu_st->dev_count) {
  98             trace_cpuhp_acpi_invalid_idx_selected(cpu_st->selector);
  99             return;
 100         }
 101     }
 102
 103     switch (addr) {
 104     case ACPI_CPU_SELECTOR_OFFSET_WR: /* current CPU selector */
 105         cpu_st->selector = data;
 106         trace_cpuhp_acpi_write_idx(cpu_st->selector);
 107         break;
 108     case ACPI_CPU_FLAGS_OFFSET_RW: /* set is_* fields  */
 109         cdev = &cpu_st->devs[cpu_st->selector];
 110         if (data & 2) { /* clear insert event */
 111             cdev->is_inserting = false;
 112             trace_cpuhp_acpi_clear_inserting_evt(cpu_st->selector);
 113         } else if (data & 4) { /* clear remove event */
 114             cdev->is_removing = false;
 115             trace_cpuhp_acpi_clear_remove_evt(cpu_st->selector);
 116         } else if (data & 8) {
 117             DeviceState *dev = NULL;
 118             HotplugHandler *hotplug_ctrl = NULL;
 119
 120             if (!cdev->cpu || cdev->cpu == first_cpu) {
 121                 trace_cpuhp_acpi_ejecting_invalid_cpu(cpu_st->selector);
 122                 break;
 123             }
 124
 125             trace_cpuhp_acpi_ejecting_cpu(cpu_st->selector);
 126             dev = DEVICE(cdev->cpu);
 127             hotplug_ctrl = qdev_get_hotplug_handler(dev);
 128             hotplug_handler_unplug(hotplug_ctrl, dev, NULL);
 129             object_unparent(OBJECT(dev));
 130         }
 131         break;
 132     case ACPI_CPU_CMD_OFFSET_WR:
 133         trace_cpuhp_acpi_write_cmd(cpu_st->selector, data);
 134         if (data < CPHP_CMD_MAX) {
 135             cpu_st->command = data;
 136             if (cpu_st->command == CPHP_GET_NEXT_CPU_WITH_EVENT_CMD) {
 137                 uint32_t iter = cpu_st->selector;
 138
 139                 do {
 140                     cdev = &cpu_st->devs[iter];
 141                     if (cdev->is_inserting || cdev->is_removing) {
 142                         cpu_st->selector = iter;
 143                         trace_cpuhp_acpi_cpu_has_events(cpu_st->selector,
 144                             cdev->is_inserting, cdev->is_removing);
 145                         break;
 146                     }
 147                     iter = iter + 1 < cpu_st->dev_count ? iter + 1 : 0;
 148                 } while (iter != cpu_st->selector);
 149             }
 150         }
 151         break;
 152     case ACPI_CPU_CMD_DATA_OFFSET_RW:
 153         switch (cpu_st->command) {
 154         case CPHP_OST_EVENT_CMD: {
 155            cdev = &cpu_st->devs[cpu_st->selector];
 156            cdev->ost_event = data;
 157            trace_cpuhp_acpi_write_ost_ev(cpu_st->selector, cdev->ost_event);
 158            break;
 159         }
 160         case CPHP_OST_STATUS_CMD: {
 161            cdev = &cpu_st->devs[cpu_st->selector];
 162            cdev->ost_status = data;
 163            info = acpi_cpu_device_status(cpu_st->selector, cdev);
 164            qapi_event_send_acpi_device_ost(info);
 165            qapi_free_ACPIOSTInfo(info);
 166            trace_cpuhp_acpi_write_ost_status(cpu_st->selector,
 167                                              cdev->ost_status);
 168            break;
 169         }
 170         default:
 171            break;
 172         }
 173         break;
 174     default:
 175         break;
 176     }
 177 }
 178
 179 static const MemoryRegionOps cpu_hotplug_ops = {
 180     .read = cpu_hotplug_rd,
 181     .write = cpu_hotplug_wr,
 182     .endianness = DEVICE_LITTLE_ENDIAN,
 183     .valid = {
 184         .min_access_size = 1,
 185         .max_access_size = 4,
 186     },
 187 };
 188
 189 void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
 190                          CPUHotplugState *state, hwaddr base_addr)
 191 {
 192     MachineState *machine = MACHINE(qdev_get_machine());
 193     MachineClass *mc = MACHINE_GET_CLASS(machine);
 194     const CPUArchIdList *id_list;
 195     int i;
 196
 197     assert(mc->possible_cpu_arch_ids);
 198     id_list = mc->possible_cpu_arch_ids(machine);
 199     state->dev_count = id_list->len;
 200     state->devs = g_new0(typeof(*state->devs), state->dev_count);
 201     for (i = 0; i < id_list->len; i++) {
 202         state->devs[i].cpu =  CPU(id_list->cpus[i].cpu);
 203         state->devs[i].arch_id = id_list->cpus[i].arch_id;
 204     }
 205     memory_region_init_io(&state->ctrl_reg, owner, &cpu_hotplug_ops, state,
 206                           "acpi-mem-hotplug", ACPI_CPU_HOTPLUG_REG_LEN);
 207     memory_region_add_subregion(as, base_addr, &state->ctrl_reg);
 208 }
 209
 210 static AcpiCpuStatus *get_cpu_status(CPUHotplugState *cpu_st, DeviceState *dev)
 211 {
 212     CPUClass *k = CPU_GET_CLASS(dev);
 213     uint64_t cpu_arch_id = k->get_arch_id(CPU(dev));
 214     int i;
 215
 216     for (i = 0; i < cpu_st->dev_count; i++) {
 217         if (cpu_arch_id == cpu_st->devs[i].arch_id) {
 218             return &cpu_st->devs[i];
 219         }
 220     }
 221     return NULL;
 222 }
 223
 224 void acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
 225                       CPUHotplugState *cpu_st, DeviceState *dev, Error **errp)
 226 {
 227     AcpiCpuStatus *cdev;
 228
 229     cdev = get_cpu_status(cpu_st, dev);
 230     if (!cdev) {
 231         return;
 232     }
 233
 234     cdev->cpu = CPU(dev);
 235     if (dev->hotplugged) {
 236         cdev->is_inserting = true;
 237         acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 238     }
 239 }
 240
 241 void acpi_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
 242                                 CPUHotplugState *cpu_st,
 243                                 DeviceState *dev, Error **errp)
 244 {
 245     AcpiCpuStatus *cdev;
 246
 247     cdev = get_cpu_status(cpu_st, dev);
 248     if (!cdev) {
 249         return;
 250     }
 251
 252     cdev->is_removing = true;
 253     acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 254 }
 255
 256 void acpi_cpu_unplug_cb(CPUHotplugState *cpu_st,
 257                         DeviceState *dev, Error **errp)
 258 {
 259     AcpiCpuStatus *cdev;
 260
 261     cdev = get_cpu_status(cpu_st, dev);
 262     if (!cdev) {
 263         return;
 264     }
 265
 266     cdev->cpu = NULL;
 267 }
 268
 269 static const VMStateDescription vmstate_cpuhp_sts = {
 270     .name = "CPU hotplug device state",
 271     .version_id = 1,
 272     .minimum_version_id = 1,
 273     .minimum_version_id_old = 1,
 274     .fields      = (VMStateField[]) {
 275         VMSTATE_BOOL(is_inserting, AcpiCpuStatus),
 276         VMSTATE_BOOL(is_removing, AcpiCpuStatus),
 277         VMSTATE_UINT32(ost_event, AcpiCpuStatus),
 278         VMSTATE_UINT32(ost_status, AcpiCpuStatus),
 279         VMSTATE_END_OF_LIST()
 280     }
 281 };
 282
 283 const VMStateDescription vmstate_cpu_hotplug = {
 284     .name = "CPU hotplug state",
 285     .version_id = 1,
 286     .minimum_version_id = 1,
 287     .minimum_version_id_old = 1,
 288     .fields      = (VMStateField[]) {
 289         VMSTATE_UINT32(selector, CPUHotplugState),
 290         VMSTATE_UINT8(command, CPUHotplugState),
 291         VMSTATE_STRUCT_VARRAY_POINTER_UINT32(devs, CPUHotplugState, dev_count,
 292                                              vmstate_cpuhp_sts, AcpiCpuStatus),
 293         VMSTATE_END_OF_LIST()
 294     }
 295 };
 296
 297 #define CPU_NAME_FMT      "C%.03X"
 298 #define CPUHP_RES_DEVICE  "PRES"
 299 #define CPU_LOCK          "CPLK"
 300 #define CPU_STS_METHOD    "CSTA"
 301 #define CPU_SCAN_METHOD   "CSCN"
 302 #define CPU_NOTIFY_METHOD "CTFY"
 303 #define CPU_EJECT_METHOD  "CEJ0"
 304 #define CPU_OST_METHOD    "COST"
 305
 306 #define CPU_ENABLED       "CPEN"
 307 #define CPU_SELECTOR      "CSEL"
 308 #define CPU_COMMAND       "CCMD"
 309 #define CPU_DATA          "CDAT"
 310 #define CPU_INSERT_EVENT  "CINS"
 311 #define CPU_REMOVE_EVENT  "CRMV"
 312 #define CPU_EJECT_EVENT   "CEJ0"
 313
 314 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
 315                     hwaddr io_base,
 316                     const char *res_root,
 317                     const char *event_handler_method)
 318 {
 319     Aml *ifctx;
 320     Aml *field;
 321     Aml *method;
 322     Aml *cpu_ctrl_dev;
 323     Aml *cpus_dev;
 324     Aml *zero = aml_int(0);
 325     Aml *one = aml_int(1);
 326     Aml *sb_scope = aml_scope("_SB");
 327     MachineClass *mc = MACHINE_GET_CLASS(machine);
 328     const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(machine);
 329     char *cphp_res_path = g_strdup_printf("%s." CPUHP_RES_DEVICE, res_root);
 330     Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
 331     AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 332     AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
 333
 334     cpu_ctrl_dev = aml_device("%s", cphp_res_path);
 335     {
 336         Aml *crs;
 337
 338         aml_append(cpu_ctrl_dev,
 339             aml_name_decl("_HID", aml_eisaid("PNP0A06")));
 340         aml_append(cpu_ctrl_dev,
 341             aml_name_decl("_UID", aml_string("CPU Hotplug resources")));
 342         aml_append(cpu_ctrl_dev, aml_mutex(CPU_LOCK, 0));
 343
 344         crs = aml_resource_template();
 345         aml_append(crs, aml_io(AML_DECODE16, io_base, io_base, 1,
 346                                ACPI_CPU_HOTPLUG_REG_LEN));
 347         aml_append(cpu_ctrl_dev, aml_name_decl("_CRS", crs));
 348
 349         /* declare CPU hotplug MMIO region with related access fields */
 350         aml_append(cpu_ctrl_dev,
 351             aml_operation_region("PRST", AML_SYSTEM_IO, aml_int(io_base),
 352                                  ACPI_CPU_HOTPLUG_REG_LEN));
 353
 354         field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK,
 355                           AML_WRITE_AS_ZEROS);
 356         aml_append(field, aml_reserved_field(ACPI_CPU_FLAGS_OFFSET_RW * 8));
 357         /* 1 if enabled, read only */
 358         aml_append(field, aml_named_field(CPU_ENABLED, 1));
 359         /* (read) 1 if has a insert event. (write) 1 to clear event */
 360         aml_append(field, aml_named_field(CPU_INSERT_EVENT, 1));
 361         /* (read) 1 if has a remove event. (write) 1 to clear event */
 362         aml_append(field, aml_named_field(CPU_REMOVE_EVENT, 1));
 363         /* initiates device eject, write only */
 364         aml_append(field, aml_named_field(CPU_EJECT_EVENT, 1));
 365         aml_append(field, aml_reserved_field(4));
 366         aml_append(field, aml_named_field(CPU_COMMAND, 8));
 367         aml_append(cpu_ctrl_dev, field);
 368
 369         field = aml_field("PRST", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
 370         /* CPU selector, write only */
 371         aml_append(field, aml_named_field(CPU_SELECTOR, 32));
 372         /* flags + cmd + 2byte align */
 373         aml_append(field, aml_reserved_field(4 * 8));
 374         aml_append(field, aml_named_field(CPU_DATA, 32));
 375         aml_append(cpu_ctrl_dev, field);
 376
 377         if (opts.has_legacy_cphp) {
 378             method = aml_method("_INI", 0, AML_SERIALIZED);
 379             /* switch off legacy CPU hotplug HW and use new one,
 380              * on reboot system is in new mode and writing 0
 381              * in CPU_SELECTOR selects BSP, which is NOP at
 382              * the time _INI is called */
 383             aml_append(method, aml_store(zero, aml_name(CPU_SELECTOR)));
 384             aml_append(cpu_ctrl_dev, method);
 385         }
 386     }
 387     aml_append(sb_scope, cpu_ctrl_dev);
 388
 389     cpus_dev = aml_device("\\_SB.CPUS");
 390     {
 391         int i;
 392         Aml *ctrl_lock = aml_name("%s.%s", cphp_res_path, CPU_LOCK);
 393         Aml *cpu_selector = aml_name("%s.%s", cphp_res_path, CPU_SELECTOR);
 394         Aml *is_enabled = aml_name("%s.%s", cphp_res_path, CPU_ENABLED);
 395         Aml *cpu_cmd = aml_name("%s.%s", cphp_res_path, CPU_COMMAND);
 396         Aml *cpu_data = aml_name("%s.%s", cphp_res_path, CPU_DATA);
 397         Aml *ins_evt = aml_name("%s.%s", cphp_res_path, CPU_INSERT_EVENT);
 398         Aml *rm_evt = aml_name("%s.%s", cphp_res_path, CPU_REMOVE_EVENT);
 399         Aml *ej_evt = aml_name("%s.%s", cphp_res_path, CPU_EJECT_EVENT);
 400
 401         aml_append(cpus_dev, aml_name_decl("_HID", aml_string("ACPI0010")));
 402         aml_append(cpus_dev, aml_name_decl("_CID", aml_eisaid("PNP0A05")));
 403
 404         method = aml_method(CPU_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
 405         for (i = 0; i < arch_ids->len; i++) {
 406             Aml *cpu = aml_name(CPU_NAME_FMT, i);
 407             Aml *uid = aml_arg(0);
 408             Aml *event = aml_arg(1);
 409
 410             ifctx = aml_if(aml_equal(uid, aml_int(i)));
 411             {
 412                 aml_append(ifctx, aml_notify(cpu, event));
 413             }
 414             aml_append(method, ifctx);
 415         }
 416         aml_append(cpus_dev, method);
 417
 418         method = aml_method(CPU_STS_METHOD, 1, AML_SERIALIZED);
 419         {
 420             Aml *idx = aml_arg(0);
 421             Aml *sta = aml_local(0);
 422
 423             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 424             aml_append(method, aml_store(idx, cpu_selector));
 425             aml_append(method, aml_store(zero, sta));
 426             ifctx = aml_if(aml_equal(is_enabled, one));
 427             {
 428                 aml_append(ifctx, aml_store(aml_int(0xF), sta));
 429             }
 430             aml_append(method, ifctx);
 431             aml_append(method, aml_release(ctrl_lock));
 432             aml_append(method, aml_return(sta));
 433         }
 434         aml_append(cpus_dev, method);
 435
 436         method = aml_method(CPU_EJECT_METHOD, 1, AML_SERIALIZED);
 437         {
 438             Aml *idx = aml_arg(0);
 439
 440             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 441             aml_append(method, aml_store(idx, cpu_selector));
 442             aml_append(method, aml_store(one, ej_evt));
 443             aml_append(method, aml_release(ctrl_lock));
 444         }
 445         aml_append(cpus_dev, method);
 446
 447         method = aml_method(CPU_SCAN_METHOD, 0, AML_SERIALIZED);
 448         {
 449             Aml *else_ctx;
 450             Aml *while_ctx;
 451             Aml *has_event = aml_local(0);
 452             Aml *dev_chk = aml_int(1);
 453             Aml *eject_req = aml_int(3);
 454             Aml *next_cpu_cmd = aml_int(CPHP_GET_NEXT_CPU_WITH_EVENT_CMD);
 455
 456             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 457             aml_append(method, aml_store(one, has_event));
 458             while_ctx = aml_while(aml_equal(has_event, one));
 459             {
 460                  /* clear loop exit condition, ins_evt/rm_evt checks
 461                   * will set it to 1 while next_cpu_cmd returns a CPU
 462                   * with events */
 463                  aml_append(while_ctx, aml_store(zero, has_event));
 464                  aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd));
 465                  ifctx = aml_if(aml_equal(ins_evt, one));
 466                  {
 467                      aml_append(ifctx,
 468                          aml_call2(CPU_NOTIFY_METHOD, cpu_data, dev_chk));
 469                      aml_append(ifctx, aml_store(one, ins_evt));
 470                      aml_append(ifctx, aml_store(one, has_event));
 471                  }
 472                  aml_append(while_ctx, ifctx);
 473                  else_ctx = aml_else();
 474                  ifctx = aml_if(aml_equal(rm_evt, one));
 475                  {
 476                      aml_append(ifctx,
 477                          aml_call2(CPU_NOTIFY_METHOD, cpu_data, eject_req));
 478                      aml_append(ifctx, aml_store(one, rm_evt));
 479                      aml_append(ifctx, aml_store(one, has_event));
 480                  }
 481                  aml_append(else_ctx, ifctx);
 482                  aml_append(while_ctx, else_ctx);
 483             }
 484             aml_append(method, while_ctx);
 485             aml_append(method, aml_release(ctrl_lock));
 486         }
 487         aml_append(cpus_dev, method);
 488
 489         method = aml_method(CPU_OST_METHOD, 4, AML_SERIALIZED);
 490         {
 491             Aml *uid = aml_arg(0);
 492             Aml *ev_cmd = aml_int(CPHP_OST_EVENT_CMD);
 493             Aml *st_cmd = aml_int(CPHP_OST_STATUS_CMD);
 494
 495             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 496             aml_append(method, aml_store(uid, cpu_selector));
 497             aml_append(method, aml_store(ev_cmd, cpu_cmd));
 498             aml_append(method, aml_store(aml_arg(1), cpu_data));
 499             aml_append(method, aml_store(st_cmd, cpu_cmd));
 500             aml_append(method, aml_store(aml_arg(2), cpu_data));
 501             aml_append(method, aml_release(ctrl_lock));
 502         }
 503         aml_append(cpus_dev, method);
 504
 505         /* build Processor object for each processor */
 506         for (i = 0; i < arch_ids->len; i++) {
 507             Aml *dev;
 508             Aml *uid = aml_int(i);
 509             GArray *madt_buf = g_array_new(0, 1, 1);
 510             int arch_id = arch_ids->cpus[i].arch_id;
 511
 512             if (opts.acpi_1_compatible && arch_id < 255) {
 513                 dev = aml_processor(i, 0, 0, CPU_NAME_FMT, i);
 514             } else {
 515                 dev = aml_device(CPU_NAME_FMT, i);
 516                 aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
 517                 aml_append(dev, aml_name_decl("_UID", uid));
 518             }
 519
 520             method = aml_method("_STA", 0, AML_SERIALIZED);
 521             aml_append(method, aml_return(aml_call1(CPU_STS_METHOD, uid)));
 522             aml_append(dev, method);
 523
 524             /* build _MAT object */
 525             assert(adevc && adevc->madt_cpu);
 526             adevc->madt_cpu(adev, i, arch_ids, madt_buf);
 527             switch (madt_buf->data[0]) {
 528             case ACPI_APIC_PROCESSOR: {
 529                 AcpiMadtProcessorApic *apic = (void *)madt_buf->data;
 530                 apic->flags = cpu_to_le32(1);
 531                 break;
 532             }
 533             case ACPI_APIC_LOCAL_X2APIC: {
 534                 AcpiMadtProcessorX2Apic *apic = (void *)madt_buf->data;
 535                 apic->flags = cpu_to_le32(1);
 536                 break;
 537             }
 538             default:
 539                 assert(0);
 540             }
 541             aml_append(dev, aml_name_decl("_MAT",
 542                 aml_buffer(madt_buf->len, (uint8_t *)madt_buf->data)));
 543             g_array_free(madt_buf, true);
 544
 545             if (CPU(arch_ids->cpus[i].cpu) != first_cpu) {
 546                 method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
 547                 aml_append(method, aml_call1(CPU_EJECT_METHOD, uid));
 548                 aml_append(dev, method);
 549             }
 550
 551             method = aml_method("_OST", 3, AML_SERIALIZED);
 552             aml_append(method,
 553                 aml_call4(CPU_OST_METHOD, uid, aml_arg(0),
 554                           aml_arg(1), aml_arg(2))
 555             );
 556             aml_append(dev, method);
 557
 558             /* Linux guests discard SRAT info for non-present CPUs
 559              * as a result _PXM is required for all CPUs which might
 560              * be hot-plugged. For simplicity, add it for all CPUs.
 561              */
 562             if (arch_ids->cpus[i].props.has_node_id) {
 563                 aml_append(dev, aml_name_decl("_PXM",
 564                            aml_int(arch_ids->cpus[i].props.node_id)));
 565             }
 566
 567             aml_append(cpus_dev, dev);
 568         }
 569     }
 570     aml_append(sb_scope, cpus_dev);
 571     aml_append(table, sb_scope);
 572
 573     method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
 574     aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
 575     aml_append(table, method);
 576
 577     g_free(cphp_res_path);
 578 }