qemu/hw/acpi/cpu.c
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   1#include "qemu/osdep.h"
   2#include "hw/boards.h"
   3#include "hw/acpi/cpu.h"
   4#include "qapi/error.h"
   5#include "qapi-event.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
  15enum {
  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
  22static 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
  40void 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
  53static 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
  87static 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) {
 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        }
 130        break;
 131    case ACPI_CPU_CMD_OFFSET_WR:
 132        trace_cpuhp_acpi_write_cmd(cpu_st->selector, data);
 133        if (data < CPHP_CMD_MAX) {
 134            cpu_st->command = data;
 135            if (cpu_st->command == CPHP_GET_NEXT_CPU_WITH_EVENT_CMD) {
 136                uint32_t iter = cpu_st->selector;
 137
 138                do {
 139                    cdev = &cpu_st->devs[iter];
 140                    if (cdev->is_inserting || cdev->is_removing) {
 141                        cpu_st->selector = iter;
 142                        trace_cpuhp_acpi_cpu_has_events(cpu_st->selector,
 143                            cdev->is_inserting, cdev->is_removing);
 144                        break;
 145                    }
 146                    iter = iter + 1 < cpu_st->dev_count ? iter + 1 : 0;
 147                } while (iter != cpu_st->selector);
 148            }
 149        }
 150        break;
 151    case ACPI_CPU_CMD_DATA_OFFSET_RW:
 152        switch (cpu_st->command) {
 153        case CPHP_OST_EVENT_CMD: {
 154           cdev = &cpu_st->devs[cpu_st->selector];
 155           cdev->ost_event = data;
 156           trace_cpuhp_acpi_write_ost_ev(cpu_st->selector, cdev->ost_event);
 157           break;
 158        }
 159        case CPHP_OST_STATUS_CMD: {
 160           cdev = &cpu_st->devs[cpu_st->selector];
 161           cdev->ost_status = data;
 162           info = acpi_cpu_device_status(cpu_st->selector, cdev);
 163           qapi_event_send_acpi_device_ost(info, &error_abort);
 164           qapi_free_ACPIOSTInfo(info);
 165           trace_cpuhp_acpi_write_ost_status(cpu_st->selector,
 166                                             cdev->ost_status);
 167           break;
 168        }
 169        default:
 170           break;
 171        }
 172        break;
 173    default:
 174        break;
 175    }
 176}
 177
 178static const MemoryRegionOps cpu_hotplug_ops = {
 179    .read = cpu_hotplug_rd,
 180    .write = cpu_hotplug_wr,
 181    .endianness = DEVICE_LITTLE_ENDIAN,
 182    .valid = {
 183        .min_access_size = 1,
 184        .max_access_size = 4,
 185    },
 186};
 187
 188void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
 189                         CPUHotplugState *state, hwaddr base_addr)
 190{
 191    MachineState *machine = MACHINE(qdev_get_machine());
 192    MachineClass *mc = MACHINE_GET_CLASS(machine);
 193    const CPUArchIdList *id_list;
 194    int i;
 195
 196    assert(mc->possible_cpu_arch_ids);
 197    id_list = mc->possible_cpu_arch_ids(machine);
 198    state->dev_count = id_list->len;
 199    state->devs = g_new0(typeof(*state->devs), state->dev_count);
 200    for (i = 0; i < id_list->len; i++) {
 201        state->devs[i].cpu =  CPU(id_list->cpus[i].cpu);
 202        state->devs[i].arch_id = id_list->cpus[i].arch_id;
 203    }
 204    memory_region_init_io(&state->ctrl_reg, owner, &cpu_hotplug_ops, state,
 205                          "acpi-mem-hotplug", ACPI_CPU_HOTPLUG_REG_LEN);
 206    memory_region_add_subregion(as, base_addr, &state->ctrl_reg);
 207}
 208
 209static AcpiCpuStatus *get_cpu_status(CPUHotplugState *cpu_st, DeviceState *dev)
 210{
 211    CPUClass *k = CPU_GET_CLASS(dev);
 212    uint64_t cpu_arch_id = k->get_arch_id(CPU(dev));
 213    int i;
 214
 215    for (i = 0; i < cpu_st->dev_count; i++) {
 216        if (cpu_arch_id == cpu_st->devs[i].arch_id) {
 217            return &cpu_st->devs[i];
 218        }
 219    }
 220    return NULL;
 221}
 222
 223void acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
 224                      CPUHotplugState *cpu_st, DeviceState *dev, Error **errp)
 225{
 226    AcpiCpuStatus *cdev;
 227
 228    cdev = get_cpu_status(cpu_st, dev);
 229    if (!cdev) {
 230        return;
 231    }
 232
 233    cdev->cpu = CPU(dev);
 234    if (dev->hotplugged) {
 235        cdev->is_inserting = true;
 236        acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 237    }
 238}
 239
 240void acpi_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
 241                                CPUHotplugState *cpu_st,
 242                                DeviceState *dev, Error **errp)
 243{
 244    AcpiCpuStatus *cdev;
 245
 246    cdev = get_cpu_status(cpu_st, dev);
 247    if (!cdev) {
 248        return;
 249    }
 250
 251    cdev->is_removing = true;
 252    acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 253}
 254
 255void acpi_cpu_unplug_cb(CPUHotplugState *cpu_st,
 256                        DeviceState *dev, Error **errp)
 257{
 258    AcpiCpuStatus *cdev;
 259
 260    cdev = get_cpu_status(cpu_st, dev);
 261    if (!cdev) {
 262        return;
 263    }
 264
 265    cdev->cpu = NULL;
 266}
 267
 268static const VMStateDescription vmstate_cpuhp_sts = {
 269    .name = "CPU hotplug device state",
 270    .version_id = 1,
 271    .minimum_version_id = 1,
 272    .minimum_version_id_old = 1,
 273    .fields      = (VMStateField[]) {
 274        VMSTATE_BOOL(is_inserting, AcpiCpuStatus),
 275        VMSTATE_BOOL(is_removing, AcpiCpuStatus),
 276        VMSTATE_UINT32(ost_event, AcpiCpuStatus),
 277        VMSTATE_UINT32(ost_status, AcpiCpuStatus),
 278        VMSTATE_END_OF_LIST()
 279    }
 280};
 281
 282const VMStateDescription vmstate_cpu_hotplug = {
 283    .name = "CPU hotplug state",
 284    .version_id = 1,
 285    .minimum_version_id = 1,
 286    .minimum_version_id_old = 1,
 287    .fields      = (VMStateField[]) {
 288        VMSTATE_UINT32(selector, CPUHotplugState),
 289        VMSTATE_UINT8(command, CPUHotplugState),
 290        VMSTATE_STRUCT_VARRAY_POINTER_UINT32(devs, CPUHotplugState, dev_count,
 291                                             vmstate_cpuhp_sts, AcpiCpuStatus),
 292        VMSTATE_END_OF_LIST()
 293    }
 294};
 295
 296#define CPU_NAME_FMT      "C%.03X"
 297#define CPUHP_RES_DEVICE  "PRES"
 298#define CPU_LOCK          "CPLK"
 299#define CPU_STS_METHOD    "CSTA"
 300#define CPU_SCAN_METHOD   "CSCN"
 301#define CPU_NOTIFY_METHOD "CTFY"
 302#define CPU_EJECT_METHOD  "CEJ0"
 303#define CPU_OST_METHOD    "COST"
 304
 305#define CPU_ENABLED       "CPEN"
 306#define CPU_SELECTOR      "CSEL"
 307#define CPU_COMMAND       "CCMD"
 308#define CPU_DATA          "CDAT"
 309#define CPU_INSERT_EVENT  "CINS"
 310#define CPU_REMOVE_EVENT  "CRMV"
 311#define CPU_EJECT_EVENT   "CEJ0"
 312
 313void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
 314                    hwaddr io_base,
 315                    const char *res_root,
 316                    const char *event_handler_method)
 317{
 318    Aml *ifctx;
 319    Aml *field;
 320    Aml *method;
 321    Aml *cpu_ctrl_dev;
 322    Aml *cpus_dev;
 323    Aml *zero = aml_int(0);
 324    Aml *one = aml_int(1);
 325    Aml *sb_scope = aml_scope("_SB");
 326    MachineClass *mc = MACHINE_GET_CLASS(machine);
 327    const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(machine);
 328    char *cphp_res_path = g_strdup_printf("%s." CPUHP_RES_DEVICE, res_root);
 329    Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
 330    AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 331    AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
 332
 333    cpu_ctrl_dev = aml_device("%s", cphp_res_path);
 334    {
 335        Aml *crs;
 336
 337        aml_append(cpu_ctrl_dev,
 338            aml_name_decl("_HID", aml_eisaid("PNP0A06")));
 339        aml_append(cpu_ctrl_dev,
 340            aml_name_decl("_UID", aml_string("CPU Hotplug resources")));
 341        aml_append(cpu_ctrl_dev, aml_mutex(CPU_LOCK, 0));
 342
 343        crs = aml_resource_template();
 344        aml_append(crs, aml_io(AML_DECODE16, io_base, io_base, 1,
 345                               ACPI_CPU_HOTPLUG_REG_LEN));
 346        aml_append(cpu_ctrl_dev, aml_name_decl("_CRS", crs));
 347
 348        /* declare CPU hotplug MMIO region with related access fields */
 349        aml_append(cpu_ctrl_dev,
 350            aml_operation_region("PRST", AML_SYSTEM_IO, aml_int(io_base),
 351                                 ACPI_CPU_HOTPLUG_REG_LEN));
 352
 353        field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK,
 354                          AML_WRITE_AS_ZEROS);
 355        aml_append(field, aml_reserved_field(ACPI_CPU_FLAGS_OFFSET_RW * 8));
 356        /* 1 if enabled, read only */
 357        aml_append(field, aml_named_field(CPU_ENABLED, 1));
 358        /* (read) 1 if has a insert event. (write) 1 to clear event */
 359        aml_append(field, aml_named_field(CPU_INSERT_EVENT, 1));
 360        /* (read) 1 if has a remove event. (write) 1 to clear event */
 361        aml_append(field, aml_named_field(CPU_REMOVE_EVENT, 1));
 362        /* initiates device eject, write only */
 363        aml_append(field, aml_named_field(CPU_EJECT_EVENT, 1));
 364        aml_append(field, aml_reserved_field(4));
 365        aml_append(field, aml_named_field(CPU_COMMAND, 8));
 366        aml_append(cpu_ctrl_dev, field);
 367
 368        field = aml_field("PRST", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
 369        /* CPU selector, write only */
 370        aml_append(field, aml_named_field(CPU_SELECTOR, 32));
 371        /* flags + cmd + 2byte align */
 372        aml_append(field, aml_reserved_field(4 * 8));
 373        aml_append(field, aml_named_field(CPU_DATA, 32));
 374        aml_append(cpu_ctrl_dev, field);
 375
 376        if (opts.has_legacy_cphp) {
 377            method = aml_method("_INI", 0, AML_SERIALIZED);
 378            /* switch off legacy CPU hotplug HW and use new one,
 379             * on reboot system is in new mode and writing 0
 380             * in CPU_SELECTOR selects BSP, which is NOP at
 381             * the time _INI is called */
 382            aml_append(method, aml_store(zero, aml_name(CPU_SELECTOR)));
 383            aml_append(cpu_ctrl_dev, method);
 384        }
 385    }
 386    aml_append(sb_scope, cpu_ctrl_dev);
 387
 388    cpus_dev = aml_device("\\_SB.CPUS");
 389    {
 390        int i;
 391        Aml *ctrl_lock = aml_name("%s.%s", cphp_res_path, CPU_LOCK);
 392        Aml *cpu_selector = aml_name("%s.%s", cphp_res_path, CPU_SELECTOR);
 393        Aml *is_enabled = aml_name("%s.%s", cphp_res_path, CPU_ENABLED);
 394        Aml *cpu_cmd = aml_name("%s.%s", cphp_res_path, CPU_COMMAND);
 395        Aml *cpu_data = aml_name("%s.%s", cphp_res_path, CPU_DATA);
 396        Aml *ins_evt = aml_name("%s.%s", cphp_res_path, CPU_INSERT_EVENT);
 397        Aml *rm_evt = aml_name("%s.%s", cphp_res_path, CPU_REMOVE_EVENT);
 398        Aml *ej_evt = aml_name("%s.%s", cphp_res_path, CPU_EJECT_EVENT);
 399
 400        aml_append(cpus_dev, aml_name_decl("_HID", aml_string("ACPI0010")));
 401        aml_append(cpus_dev, aml_name_decl("_CID", aml_eisaid("PNP0A05")));
 402
 403        method = aml_method(CPU_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
 404        for (i = 0; i < arch_ids->len; i++) {
 405            Aml *cpu = aml_name(CPU_NAME_FMT, i);
 406            Aml *uid = aml_arg(0);
 407            Aml *event = aml_arg(1);
 408
 409            ifctx = aml_if(aml_equal(uid, aml_int(i)));
 410            {
 411                aml_append(ifctx, aml_notify(cpu, event));
 412            }
 413            aml_append(method, ifctx);
 414        }
 415        aml_append(cpus_dev, method);
 416
 417        method = aml_method(CPU_STS_METHOD, 1, AML_SERIALIZED);
 418        {
 419            Aml *idx = aml_arg(0);
 420            Aml *sta = aml_local(0);
 421
 422            aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 423            aml_append(method, aml_store(idx, cpu_selector));
 424            aml_append(method, aml_store(zero, sta));
 425            ifctx = aml_if(aml_equal(is_enabled, one));
 426            {
 427                aml_append(ifctx, aml_store(aml_int(0xF), sta));
 428            }
 429            aml_append(method, ifctx);
 430            aml_append(method, aml_release(ctrl_lock));
 431            aml_append(method, aml_return(sta));
 432        }
 433        aml_append(cpus_dev, method);
 434
 435        method = aml_method(CPU_EJECT_METHOD, 1, AML_SERIALIZED);
 436        {
 437            Aml *idx = aml_arg(0);
 438
 439            aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 440            aml_append(method, aml_store(idx, cpu_selector));
 441            aml_append(method, aml_store(one, ej_evt));
 442            aml_append(method, aml_release(ctrl_lock));
 443        }
 444        aml_append(cpus_dev, method);
 445
 446        method = aml_method(CPU_SCAN_METHOD, 0, AML_SERIALIZED);
 447        {
 448            Aml *else_ctx;
 449            Aml *while_ctx;
 450            Aml *has_event = aml_local(0);
 451            Aml *dev_chk = aml_int(1);
 452            Aml *eject_req = aml_int(3);
 453            Aml *next_cpu_cmd = aml_int(CPHP_GET_NEXT_CPU_WITH_EVENT_CMD);
 454
 455            aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 456            aml_append(method, aml_store(one, has_event));
 457            while_ctx = aml_while(aml_equal(has_event, one));
 458            {
 459                 /* clear loop exit condition, ins_evt/rm_evt checks
 460                  * will set it to 1 while next_cpu_cmd returns a CPU
 461                  * with events */
 462                 aml_append(while_ctx, aml_store(zero, has_event));
 463                 aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd));
 464                 ifctx = aml_if(aml_equal(ins_evt, one));
 465                 {
 466                     aml_append(ifctx,
 467                         aml_call2(CPU_NOTIFY_METHOD, cpu_data, dev_chk));
 468                     aml_append(ifctx, aml_store(one, ins_evt));
 469                     aml_append(ifctx, aml_store(one, has_event));
 470                 }
 471                 aml_append(while_ctx, ifctx);
 472                 else_ctx = aml_else();
 473                 ifctx = aml_if(aml_equal(rm_evt, one));
 474                 {
 475                     aml_append(ifctx,
 476                         aml_call2(CPU_NOTIFY_METHOD, cpu_data, eject_req));
 477                     aml_append(ifctx, aml_store(one, rm_evt));
 478                     aml_append(ifctx, aml_store(one, has_event));
 479                 }
 480                 aml_append(else_ctx, ifctx);
 481                 aml_append(while_ctx, else_ctx);
 482            }
 483            aml_append(method, while_ctx);
 484            aml_append(method, aml_release(ctrl_lock));
 485        }
 486        aml_append(cpus_dev, method);
 487
 488        method = aml_method(CPU_OST_METHOD, 4, AML_SERIALIZED);
 489        {
 490            Aml *uid = aml_arg(0);
 491            Aml *ev_cmd = aml_int(CPHP_OST_EVENT_CMD);
 492            Aml *st_cmd = aml_int(CPHP_OST_STATUS_CMD);
 493
 494            aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 495            aml_append(method, aml_store(uid, cpu_selector));
 496            aml_append(method, aml_store(ev_cmd, cpu_cmd));
 497            aml_append(method, aml_store(aml_arg(1), cpu_data));
 498            aml_append(method, aml_store(st_cmd, cpu_cmd));
 499            aml_append(method, aml_store(aml_arg(2), cpu_data));
 500            aml_append(method, aml_release(ctrl_lock));
 501        }
 502        aml_append(cpus_dev, method);
 503
 504        /* build Processor object for each processor */
 505        for (i = 0; i < arch_ids->len; i++) {
 506            Aml *dev;
 507            Aml *uid = aml_int(i);
 508            GArray *madt_buf = g_array_new(0, 1, 1);
 509            int arch_id = arch_ids->cpus[i].arch_id;
 510
 511            if (opts.apci_1_compatible && arch_id < 255) {
 512                dev = aml_processor(i, 0, 0, CPU_NAME_FMT, i);
 513            } else {
 514                dev = aml_device(CPU_NAME_FMT, i);
 515                aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
 516                aml_append(dev, aml_name_decl("_UID", uid));
 517            }
 518
 519            method = aml_method("_STA", 0, AML_SERIALIZED);
 520            aml_append(method, aml_return(aml_call1(CPU_STS_METHOD, uid)));
 521            aml_append(dev, method);
 522
 523            /* build _MAT object */
 524            assert(adevc && adevc->madt_cpu);
 525            adevc->madt_cpu(adev, i, arch_ids, madt_buf);
 526            switch (madt_buf->data[0]) {
 527            case ACPI_APIC_PROCESSOR: {
 528                AcpiMadtProcessorApic *apic = (void *)madt_buf->data;
 529                apic->flags = cpu_to_le32(1);
 530                break;
 531            }
 532            case ACPI_APIC_LOCAL_X2APIC: {
 533                AcpiMadtProcessorX2Apic *apic = (void *)madt_buf->data;
 534                apic->flags = cpu_to_le32(1);
 535                break;
 536            }
 537            default:
 538                assert(0);
 539            }
 540            aml_append(dev, aml_name_decl("_MAT",
 541                aml_buffer(madt_buf->len, (uint8_t *)madt_buf->data)));
 542            g_array_free(madt_buf, true);
 543
 544            method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
 545            aml_append(method, aml_call1(CPU_EJECT_METHOD, uid));
 546            aml_append(dev, method);
 547
 548            method = aml_method("_OST", 3, AML_SERIALIZED);
 549            aml_append(method,
 550                aml_call4(CPU_OST_METHOD, uid, aml_arg(0),
 551                          aml_arg(1), aml_arg(2))
 552            );
 553            aml_append(dev, method);
 554
 555            /* Linux guests discard SRAT info for non-present CPUs
 556             * as a result _PXM is required for all CPUs which might
 557             * be hot-plugged. For simplicity, add it for all CPUs.
 558             */
 559            if (arch_ids->cpus[i].props.has_node_id) {
 560                aml_append(dev, aml_name_decl("_PXM",
 561                           aml_int(arch_ids->cpus[i].props.node_id)));
 562            }
 563
 564            aml_append(cpus_dev, dev);
 565        }
 566    }
 567    aml_append(sb_scope, cpus_dev);
 568    aml_append(table, sb_scope);
 569
 570    method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
 571    aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
 572    aml_append(table, method);
 573
 574    g_free(cphp_res_path);
 575}
 576