hw/acpi/cpu.c

   1 #include "qemu/osdep.h"
   2 #include "migration/vmstate.h"
   3 #include "hw/acpi/cpu.h"
   4 #include "hw/core/cpu.h"
   5 #include "qapi/error.h"
   6 #include "qapi/qapi-events-acpi.h"
   7 #include "trace.h"
   8 #include "sysemu/numa.h"
   9
  10 #define ACPI_CPU_HOTPLUG_REG_LEN 12
  11 #define ACPI_CPU_SELECTOR_OFFSET_WR 0
  12 #define ACPI_CPU_FLAGS_OFFSET_RW 4
  13 #define ACPI_CPU_CMD_OFFSET_WR 5
  14 #define ACPI_CPU_CMD_DATA_OFFSET_RW 8
  15 #define ACPI_CPU_CMD_DATA2_OFFSET_R 0
  16
  17 #define OVMF_CPUHP_SMI_CMD 4
  18
  19 enum {
  20     CPHP_GET_NEXT_CPU_WITH_EVENT_CMD = 0,
  21     CPHP_OST_EVENT_CMD = 1,
  22     CPHP_OST_STATUS_CMD = 2,
  23     CPHP_GET_CPU_ID_CMD = 3,
  24     CPHP_CMD_MAX
  25 };
  26
  27 static ACPIOSTInfo *acpi_cpu_device_status(int idx, AcpiCpuStatus *cdev)
  28 {
  29     ACPIOSTInfo *info = g_new0(ACPIOSTInfo, 1);
  30
  31     info->slot_type = ACPI_SLOT_TYPE_CPU;
  32     info->slot = g_strdup_printf("%d", idx);
  33     info->source = cdev->ost_event;
  34     info->status = cdev->ost_status;
  35     if (cdev->cpu) {
  36         DeviceState *dev = DEVICE(cdev->cpu);
  37         if (dev->id) {
  38             info->device = g_strdup(dev->id);
  39         }
  40     }
  41     return info;
  42 }
  43
  44 void acpi_cpu_ospm_status(CPUHotplugState *cpu_st, ACPIOSTInfoList ***list)
  45 {
  46     ACPIOSTInfoList ***tail = list;
  47     int i;
  48
  49     for (i = 0; i < cpu_st->dev_count; i++) {
  50         QAPI_LIST_APPEND(*tail, acpi_cpu_device_status(i, &cpu_st->devs[i]));
  51     }
  52 }
  53
  54 static uint64_t cpu_hotplug_rd(void *opaque, hwaddr addr, unsigned size)
  55 {
  56     uint64_t val = 0;
  57     CPUHotplugState *cpu_st = opaque;
  58     AcpiCpuStatus *cdev;
  59
  60     if (cpu_st->selector >= cpu_st->dev_count) {
  61         return val;
  62     }
  63
  64     cdev = &cpu_st->devs[cpu_st->selector];
  65     switch (addr) {
  66     case ACPI_CPU_FLAGS_OFFSET_RW: /* pack and return is_* fields */
  67         val |= cdev->cpu ? 1 : 0;
  68         val |= cdev->is_inserting ? 2 : 0;
  69         val |= cdev->is_removing  ? 4 : 0;
  70         val |= cdev->fw_remove  ? 16 : 0;
  71         trace_cpuhp_acpi_read_flags(cpu_st->selector, val);
  72         break;
  73     case ACPI_CPU_CMD_DATA_OFFSET_RW:
  74         switch (cpu_st->command) {
  75         case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
  76            val = cpu_st->selector;
  77            break;
  78         case CPHP_GET_CPU_ID_CMD:
  79            val = cdev->arch_id & 0xFFFFFFFF;
  80            break;
  81         default:
  82            break;
  83         }
  84         trace_cpuhp_acpi_read_cmd_data(cpu_st->selector, val);
  85         break;
  86     case ACPI_CPU_CMD_DATA2_OFFSET_R:
  87         switch (cpu_st->command) {
  88         case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
  89            val = 0;
  90            break;
  91         case CPHP_GET_CPU_ID_CMD:
  92            val = cdev->arch_id >> 32;
  93            break;
  94         default:
  95            break;
  96         }
  97         trace_cpuhp_acpi_read_cmd_data2(cpu_st->selector, val);
  98         break;
  99     default:
 100         break;
 101     }
 102     return val;
 103 }
 104
 105 static void cpu_hotplug_wr(void *opaque, hwaddr addr, uint64_t data,
 106                            unsigned int size)
 107 {
 108     CPUHotplugState *cpu_st = opaque;
 109     AcpiCpuStatus *cdev;
 110     ACPIOSTInfo *info;
 111
 112     assert(cpu_st->dev_count);
 113
 114     if (addr) {
 115         if (cpu_st->selector >= cpu_st->dev_count) {
 116             trace_cpuhp_acpi_invalid_idx_selected(cpu_st->selector);
 117             return;
 118         }
 119     }
 120
 121     switch (addr) {
 122     case ACPI_CPU_SELECTOR_OFFSET_WR: /* current CPU selector */
 123         cpu_st->selector = data;
 124         trace_cpuhp_acpi_write_idx(cpu_st->selector);
 125         break;
 126     case ACPI_CPU_FLAGS_OFFSET_RW: /* set is_* fields  */
 127         cdev = &cpu_st->devs[cpu_st->selector];
 128         if (data & 2) { /* clear insert event */
 129             cdev->is_inserting = false;
 130             trace_cpuhp_acpi_clear_inserting_evt(cpu_st->selector);
 131         } else if (data & 4) { /* clear remove event */
 132             cdev->is_removing = false;
 133             trace_cpuhp_acpi_clear_remove_evt(cpu_st->selector);
 134         } else if (data & 8) {
 135             DeviceState *dev = NULL;
 136             HotplugHandler *hotplug_ctrl = NULL;
 137
 138             if (!cdev->cpu || cdev->cpu == first_cpu) {
 139                 trace_cpuhp_acpi_ejecting_invalid_cpu(cpu_st->selector);
 140                 break;
 141             }
 142
 143             trace_cpuhp_acpi_ejecting_cpu(cpu_st->selector);
 144             dev = DEVICE(cdev->cpu);
 145             hotplug_ctrl = qdev_get_hotplug_handler(dev);
 146             hotplug_handler_unplug(hotplug_ctrl, dev, NULL);
 147             object_unparent(OBJECT(dev));
 148             cdev->fw_remove = false;
 149         } else if (data & 16) {
 150             if (!cdev->cpu || cdev->cpu == first_cpu) {
 151                 trace_cpuhp_acpi_fw_remove_invalid_cpu(cpu_st->selector);
 152                 break;
 153             }
 154             trace_cpuhp_acpi_fw_remove_cpu(cpu_st->selector);
 155             cdev->fw_remove = true;
 156         }
 157         break;
 158     case ACPI_CPU_CMD_OFFSET_WR:
 159         trace_cpuhp_acpi_write_cmd(cpu_st->selector, data);
 160         if (data < CPHP_CMD_MAX) {
 161             cpu_st->command = data;
 162             if (cpu_st->command == CPHP_GET_NEXT_CPU_WITH_EVENT_CMD) {
 163                 uint32_t iter = cpu_st->selector;
 164
 165                 do {
 166                     cdev = &cpu_st->devs[iter];
 167                     if (cdev->is_inserting || cdev->is_removing ||
 168                         cdev->fw_remove) {
 169                         cpu_st->selector = iter;
 170                         trace_cpuhp_acpi_cpu_has_events(cpu_st->selector,
 171                             cdev->is_inserting, cdev->is_removing);
 172                         break;
 173                     }
 174                     iter = iter + 1 < cpu_st->dev_count ? iter + 1 : 0;
 175                 } while (iter != cpu_st->selector);
 176             }
 177         }
 178         break;
 179     case ACPI_CPU_CMD_DATA_OFFSET_RW:
 180         switch (cpu_st->command) {
 181         case CPHP_OST_EVENT_CMD: {
 182            cdev = &cpu_st->devs[cpu_st->selector];
 183            cdev->ost_event = data;
 184            trace_cpuhp_acpi_write_ost_ev(cpu_st->selector, cdev->ost_event);
 185            break;
 186         }
 187         case CPHP_OST_STATUS_CMD: {
 188            cdev = &cpu_st->devs[cpu_st->selector];
 189            cdev->ost_status = data;
 190            info = acpi_cpu_device_status(cpu_st->selector, cdev);
 191            qapi_event_send_acpi_device_ost(info);
 192            qapi_free_ACPIOSTInfo(info);
 193            trace_cpuhp_acpi_write_ost_status(cpu_st->selector,
 194                                              cdev->ost_status);
 195            break;
 196         }
 197         default:
 198            break;
 199         }
 200         break;
 201     default:
 202         break;
 203     }
 204 }
 205
 206 static const MemoryRegionOps cpu_hotplug_ops = {
 207     .read = cpu_hotplug_rd,
 208     .write = cpu_hotplug_wr,
 209     .endianness = DEVICE_LITTLE_ENDIAN,
 210     .valid = {
 211         .min_access_size = 1,
 212         .max_access_size = 4,
 213     },
 214 };
 215
 216 void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
 217                          CPUHotplugState *state, hwaddr base_addr)
 218 {
 219     MachineState *machine = MACHINE(qdev_get_machine());
 220     MachineClass *mc = MACHINE_GET_CLASS(machine);
 221     const CPUArchIdList *id_list;
 222     int i;
 223
 224     assert(mc->possible_cpu_arch_ids);
 225     id_list = mc->possible_cpu_arch_ids(machine);
 226     state->dev_count = id_list->len;
 227     state->devs = g_new0(typeof(*state->devs), state->dev_count);
 228     for (i = 0; i < id_list->len; i++) {
 229         state->devs[i].cpu =  CPU(id_list->cpus[i].cpu);
 230         state->devs[i].arch_id = id_list->cpus[i].arch_id;
 231     }
 232     memory_region_init_io(&state->ctrl_reg, owner, &cpu_hotplug_ops, state,
 233                           "acpi-cpu-hotplug", ACPI_CPU_HOTPLUG_REG_LEN);
 234     memory_region_add_subregion(as, base_addr, &state->ctrl_reg);
 235 }
 236
 237 static AcpiCpuStatus *get_cpu_status(CPUHotplugState *cpu_st, DeviceState *dev)
 238 {
 239     CPUClass *k = CPU_GET_CLASS(dev);
 240     uint64_t cpu_arch_id = k->get_arch_id(CPU(dev));
 241     int i;
 242
 243     for (i = 0; i < cpu_st->dev_count; i++) {
 244         if (cpu_arch_id == cpu_st->devs[i].arch_id) {
 245             return &cpu_st->devs[i];
 246         }
 247     }
 248     return NULL;
 249 }
 250
 251 void acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
 252                       CPUHotplugState *cpu_st, DeviceState *dev, Error **errp)
 253 {
 254     AcpiCpuStatus *cdev;
 255
 256     cdev = get_cpu_status(cpu_st, dev);
 257     if (!cdev) {
 258         return;
 259     }
 260
 261     cdev->cpu = CPU(dev);
 262     if (dev->hotplugged) {
 263         cdev->is_inserting = true;
 264         acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 265     }
 266 }
 267
 268 void acpi_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
 269                                 CPUHotplugState *cpu_st,
 270                                 DeviceState *dev, Error **errp)
 271 {
 272     AcpiCpuStatus *cdev;
 273
 274     cdev = get_cpu_status(cpu_st, dev);
 275     if (!cdev) {
 276         return;
 277     }
 278
 279     cdev->is_removing = true;
 280     acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 281 }
 282
 283 void acpi_cpu_unplug_cb(CPUHotplugState *cpu_st,
 284                         DeviceState *dev, Error **errp)
 285 {
 286     AcpiCpuStatus *cdev;
 287
 288     cdev = get_cpu_status(cpu_st, dev);
 289     if (!cdev) {
 290         return;
 291     }
 292
 293     cdev->cpu = NULL;
 294 }
 295
 296 static const VMStateDescription vmstate_cpuhp_sts = {
 297     .name = "CPU hotplug device state",
 298     .version_id = 1,
 299     .minimum_version_id = 1,
 300     .fields = (const VMStateField[]) {
 301         VMSTATE_BOOL(is_inserting, AcpiCpuStatus),
 302         VMSTATE_BOOL(is_removing, AcpiCpuStatus),
 303         VMSTATE_UINT32(ost_event, AcpiCpuStatus),
 304         VMSTATE_UINT32(ost_status, AcpiCpuStatus),
 305         VMSTATE_END_OF_LIST()
 306     }
 307 };
 308
 309 const VMStateDescription vmstate_cpu_hotplug = {
 310     .name = "CPU hotplug state",
 311     .version_id = 1,
 312     .minimum_version_id = 1,
 313     .fields = (const VMStateField[]) {
 314         VMSTATE_UINT32(selector, CPUHotplugState),
 315         VMSTATE_UINT8(command, CPUHotplugState),
 316         VMSTATE_STRUCT_VARRAY_POINTER_UINT32(devs, CPUHotplugState, dev_count,
 317                                              vmstate_cpuhp_sts, AcpiCpuStatus),
 318         VMSTATE_END_OF_LIST()
 319     }
 320 };
 321
 322 #define CPU_NAME_FMT      "C%.03X"
 323 #define CPUHP_RES_DEVICE  "PRES"
 324 #define CPU_LOCK          "CPLK"
 325 #define CPU_STS_METHOD    "CSTA"
 326 #define CPU_SCAN_METHOD   "CSCN"
 327 #define CPU_NOTIFY_METHOD "CTFY"
 328 #define CPU_EJECT_METHOD  "CEJ0"
 329 #define CPU_OST_METHOD    "COST"
 330 #define CPU_ADDED_LIST    "CNEW"
 331
 332 #define CPU_ENABLED       "CPEN"
 333 #define CPU_SELECTOR      "CSEL"
 334 #define CPU_COMMAND       "CCMD"
 335 #define CPU_DATA          "CDAT"
 336 #define CPU_INSERT_EVENT  "CINS"
 337 #define CPU_REMOVE_EVENT  "CRMV"
 338 #define CPU_EJECT_EVENT   "CEJ0"
 339 #define CPU_FW_EJECT_EVENT "CEJF"
 340
 341 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
 342                     build_madt_cpu_fn build_madt_cpu, hwaddr io_base,
 343                     const char *res_root,
 344                     const char *event_handler_method)
 345 {
 346     Aml *ifctx;
 347     Aml *field;
 348     Aml *method;
 349     Aml *cpu_ctrl_dev;
 350     Aml *cpus_dev;
 351     Aml *zero = aml_int(0);
 352     Aml *one = aml_int(1);
 353     Aml *sb_scope = aml_scope("_SB");
 354     MachineClass *mc = MACHINE_GET_CLASS(machine);
 355     const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(machine);
 356     char *cphp_res_path = g_strdup_printf("%s." CPUHP_RES_DEVICE, res_root);
 357
 358     cpu_ctrl_dev = aml_device("%s", cphp_res_path);
 359     {
 360         Aml *crs;
 361
 362         aml_append(cpu_ctrl_dev,
 363             aml_name_decl("_HID", aml_eisaid("PNP0A06")));
 364         aml_append(cpu_ctrl_dev,
 365             aml_name_decl("_UID", aml_string("CPU Hotplug resources")));
 366         aml_append(cpu_ctrl_dev, aml_mutex(CPU_LOCK, 0));
 367
 368         crs = aml_resource_template();
 369         aml_append(crs, aml_io(AML_DECODE16, io_base, io_base, 1,
 370                                ACPI_CPU_HOTPLUG_REG_LEN));
 371         aml_append(cpu_ctrl_dev, aml_name_decl("_CRS", crs));
 372
 373         /* declare CPU hotplug MMIO region with related access fields */
 374         aml_append(cpu_ctrl_dev,
 375             aml_operation_region("PRST", AML_SYSTEM_IO, aml_int(io_base),
 376                                  ACPI_CPU_HOTPLUG_REG_LEN));
 377
 378         field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK,
 379                           AML_WRITE_AS_ZEROS);
 380         aml_append(field, aml_reserved_field(ACPI_CPU_FLAGS_OFFSET_RW * 8));
 381         /* 1 if enabled, read only */
 382         aml_append(field, aml_named_field(CPU_ENABLED, 1));
 383         /* (read) 1 if has a insert event. (write) 1 to clear event */
 384         aml_append(field, aml_named_field(CPU_INSERT_EVENT, 1));
 385         /* (read) 1 if has a remove event. (write) 1 to clear event */
 386         aml_append(field, aml_named_field(CPU_REMOVE_EVENT, 1));
 387         /* initiates device eject, write only */
 388         aml_append(field, aml_named_field(CPU_EJECT_EVENT, 1));
 389         /* tell firmware to do device eject, write only */
 390         aml_append(field, aml_named_field(CPU_FW_EJECT_EVENT, 1));
 391         aml_append(field, aml_reserved_field(3));
 392         aml_append(field, aml_named_field(CPU_COMMAND, 8));
 393         aml_append(cpu_ctrl_dev, field);
 394
 395         field = aml_field("PRST", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
 396         /* CPU selector, write only */
 397         aml_append(field, aml_named_field(CPU_SELECTOR, 32));
 398         /* flags + cmd + 2byte align */
 399         aml_append(field, aml_reserved_field(4 * 8));
 400         aml_append(field, aml_named_field(CPU_DATA, 32));
 401         aml_append(cpu_ctrl_dev, field);
 402
 403         if (opts.has_legacy_cphp) {
 404             method = aml_method("_INI", 0, AML_SERIALIZED);
 405             /* switch off legacy CPU hotplug HW and use new one,
 406              * on reboot system is in new mode and writing 0
 407              * in CPU_SELECTOR selects BSP, which is NOP at
 408              * the time _INI is called */
 409             aml_append(method, aml_store(zero, aml_name(CPU_SELECTOR)));
 410             aml_append(cpu_ctrl_dev, method);
 411         }
 412     }
 413     aml_append(sb_scope, cpu_ctrl_dev);
 414
 415     cpus_dev = aml_device("\\_SB.CPUS");
 416     {
 417         int i;
 418         Aml *ctrl_lock = aml_name("%s.%s", cphp_res_path, CPU_LOCK);
 419         Aml *cpu_selector = aml_name("%s.%s", cphp_res_path, CPU_SELECTOR);
 420         Aml *is_enabled = aml_name("%s.%s", cphp_res_path, CPU_ENABLED);
 421         Aml *cpu_cmd = aml_name("%s.%s", cphp_res_path, CPU_COMMAND);
 422         Aml *cpu_data = aml_name("%s.%s", cphp_res_path, CPU_DATA);
 423         Aml *ins_evt = aml_name("%s.%s", cphp_res_path, CPU_INSERT_EVENT);
 424         Aml *rm_evt = aml_name("%s.%s", cphp_res_path, CPU_REMOVE_EVENT);
 425         Aml *ej_evt = aml_name("%s.%s", cphp_res_path, CPU_EJECT_EVENT);
 426         Aml *fw_ej_evt = aml_name("%s.%s", cphp_res_path, CPU_FW_EJECT_EVENT);
 427
 428         aml_append(cpus_dev, aml_name_decl("_HID", aml_string("ACPI0010")));
 429         aml_append(cpus_dev, aml_name_decl("_CID", aml_eisaid("PNP0A05")));
 430
 431         method = aml_method(CPU_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
 432         for (i = 0; i < arch_ids->len; i++) {
 433             Aml *cpu = aml_name(CPU_NAME_FMT, i);
 434             Aml *uid = aml_arg(0);
 435             Aml *event = aml_arg(1);
 436
 437             ifctx = aml_if(aml_equal(uid, aml_int(i)));
 438             {
 439                 aml_append(ifctx, aml_notify(cpu, event));
 440             }
 441             aml_append(method, ifctx);
 442         }
 443         aml_append(cpus_dev, method);
 444
 445         method = aml_method(CPU_STS_METHOD, 1, AML_SERIALIZED);
 446         {
 447             Aml *idx = aml_arg(0);
 448             Aml *sta = aml_local(0);
 449
 450             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 451             aml_append(method, aml_store(idx, cpu_selector));
 452             aml_append(method, aml_store(zero, sta));
 453             ifctx = aml_if(aml_equal(is_enabled, one));
 454             {
 455                 aml_append(ifctx, aml_store(aml_int(0xF), sta));
 456             }
 457             aml_append(method, ifctx);
 458             aml_append(method, aml_release(ctrl_lock));
 459             aml_append(method, aml_return(sta));
 460         }
 461         aml_append(cpus_dev, method);
 462
 463         method = aml_method(CPU_EJECT_METHOD, 1, AML_SERIALIZED);
 464         {
 465             Aml *idx = aml_arg(0);
 466
 467             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 468             aml_append(method, aml_store(idx, cpu_selector));
 469             if (opts.fw_unplugs_cpu) {
 470                 aml_append(method, aml_store(one, fw_ej_evt));
 471                 aml_append(method, aml_store(aml_int(OVMF_CPUHP_SMI_CMD),
 472                            aml_name("%s", opts.smi_path)));
 473             } else {
 474                 aml_append(method, aml_store(one, ej_evt));
 475             }
 476             aml_append(method, aml_release(ctrl_lock));
 477         }
 478         aml_append(cpus_dev, method);
 479
 480         method = aml_method(CPU_SCAN_METHOD, 0, AML_SERIALIZED);
 481         {
 482             const uint8_t max_cpus_per_pass = 255;
 483             Aml *else_ctx;
 484             Aml *while_ctx, *while_ctx2;
 485             Aml *has_event = aml_local(0);
 486             Aml *dev_chk = aml_int(1);
 487             Aml *eject_req = aml_int(3);
 488             Aml *next_cpu_cmd = aml_int(CPHP_GET_NEXT_CPU_WITH_EVENT_CMD);
 489             Aml *num_added_cpus = aml_local(1);
 490             Aml *cpu_idx = aml_local(2);
 491             Aml *uid = aml_local(3);
 492             Aml *has_job = aml_local(4);
 493             Aml *new_cpus = aml_name(CPU_ADDED_LIST);
 494
 495             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 496
 497             /*
 498              * Windows versions newer than XP (including Windows 10/Windows
 499              * Server 2019), do support* VarPackageOp but, it is cripled to hold
 500              * the same elements number as old PackageOp.
 501              * For compatibility with Windows XP (so it won't crash) use ACPI1.0
 502              * PackageOp which can hold max 255 elements.
 503              *
 504              * use named package as old Windows don't support it in local var
 505              */
 506             aml_append(method, aml_name_decl(CPU_ADDED_LIST,
 507                                              aml_package(max_cpus_per_pass)));
 508
 509             aml_append(method, aml_store(zero, uid));
 510             aml_append(method, aml_store(one, has_job));
 511             /*
 512              * CPU_ADDED_LIST can hold limited number of elements, outer loop
 513              * allows to process CPUs in batches which let us to handle more
 514              * CPUs than CPU_ADDED_LIST can hold.
 515              */
 516             while_ctx2 = aml_while(aml_equal(has_job, one));
 517             {
 518                 aml_append(while_ctx2, aml_store(zero, has_job));
 519
 520                 aml_append(while_ctx2, aml_store(one, has_event));
 521                 aml_append(while_ctx2, aml_store(zero, num_added_cpus));
 522
 523                 /*
 524                  * Scan CPUs, till there are CPUs with events or
 525                  * CPU_ADDED_LIST capacity is exhausted
 526                  */
 527                 while_ctx = aml_while(aml_land(aml_equal(has_event, one),
 528                                       aml_lless(uid, aml_int(arch_ids->len))));
 529                 {
 530                      /*
 531                       * clear loop exit condition, ins_evt/rm_evt checks will
 532                       * set it to 1 while next_cpu_cmd returns a CPU with events
 533                       */
 534                      aml_append(while_ctx, aml_store(zero, has_event));
 535
 536                      aml_append(while_ctx, aml_store(uid, cpu_selector));
 537                      aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd));
 538
 539                      /*
 540                       * wrap around case, scan is complete, exit loop.
 541                       * It happens since events are not cleared in scan loop,
 542                       * so next_cpu_cmd continues to find already processed CPUs
 543                       */
 544                      ifctx = aml_if(aml_lless(cpu_data, uid));
 545                      {
 546                          aml_append(ifctx, aml_break());
 547                      }
 548                      aml_append(while_ctx, ifctx);
 549
 550                      /*
 551                       * if CPU_ADDED_LIST is full, exit inner loop and process
 552                       * collected CPUs
 553                       */
 554                      ifctx = aml_if(
 555                          aml_equal(num_added_cpus, aml_int(max_cpus_per_pass)));
 556                      {
 557                          aml_append(ifctx, aml_store(one, has_job));
 558                          aml_append(ifctx, aml_break());
 559                      }
 560                      aml_append(while_ctx, ifctx);
 561
 562                      aml_append(while_ctx, aml_store(cpu_data, uid));
 563                      ifctx = aml_if(aml_equal(ins_evt, one));
 564                      {
 565                          /* cache added CPUs to Notify/Wakeup later */
 566                          aml_append(ifctx, aml_store(uid,
 567                              aml_index(new_cpus, num_added_cpus)));
 568                          aml_append(ifctx, aml_increment(num_added_cpus));
 569                          aml_append(ifctx, aml_store(one, has_event));
 570                      }
 571                      aml_append(while_ctx, ifctx);
 572                      else_ctx = aml_else();
 573                      ifctx = aml_if(aml_equal(rm_evt, one));
 574                      {
 575                          aml_append(ifctx,
 576                              aml_call2(CPU_NOTIFY_METHOD, uid, eject_req));
 577                          aml_append(ifctx, aml_store(one, rm_evt));
 578                          aml_append(ifctx, aml_store(one, has_event));
 579                      }
 580                      aml_append(else_ctx, ifctx);
 581                      aml_append(while_ctx, else_ctx);
 582                      aml_append(while_ctx, aml_increment(uid));
 583                 }
 584                 aml_append(while_ctx2, while_ctx);
 585
 586                 /*
 587                  * in case FW negotiated ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT,
 588                  * make upcall to FW, so it can pull in new CPUs before
 589                  * OS is notified and wakes them up
 590                  */
 591                 if (opts.smi_path) {
 592                     ifctx = aml_if(aml_lgreater(num_added_cpus, zero));
 593                     {
 594                         aml_append(ifctx, aml_store(aml_int(OVMF_CPUHP_SMI_CMD),
 595                             aml_name("%s", opts.smi_path)));
 596                     }
 597                     aml_append(while_ctx2, ifctx);
 598                 }
 599
 600                 /* Notify OSPM about new CPUs and clear insert events */
 601                 aml_append(while_ctx2, aml_store(zero, cpu_idx));
 602                 while_ctx = aml_while(aml_lless(cpu_idx, num_added_cpus));
 603                 {
 604                     aml_append(while_ctx,
 605                         aml_store(aml_derefof(aml_index(new_cpus, cpu_idx)),
 606                                   uid));
 607                     aml_append(while_ctx,
 608                         aml_call2(CPU_NOTIFY_METHOD, uid, dev_chk));
 609                     aml_append(while_ctx, aml_store(uid, aml_debug()));
 610                     aml_append(while_ctx, aml_store(uid, cpu_selector));
 611                     aml_append(while_ctx, aml_store(one, ins_evt));
 612                     aml_append(while_ctx, aml_increment(cpu_idx));
 613                 }
 614                 aml_append(while_ctx2, while_ctx);
 615                 /*
 616                  * If another batch is needed, then it will resume scanning
 617                  * exactly at -- and not after -- the last CPU that's currently
 618                  * in CPU_ADDED_LIST. In other words, the last CPU in
 619                  * CPU_ADDED_LIST is going to be re-checked. That's OK: we've
 620                  * just cleared the insert event for *all* CPUs in
 621                  * CPU_ADDED_LIST, including the last one. So the scan will
 622                  * simply seek past it.
 623                  */
 624             }
 625             aml_append(method, while_ctx2);
 626             aml_append(method, aml_release(ctrl_lock));
 627         }
 628         aml_append(cpus_dev, method);
 629
 630         method = aml_method(CPU_OST_METHOD, 4, AML_SERIALIZED);
 631         {
 632             Aml *uid = aml_arg(0);
 633             Aml *ev_cmd = aml_int(CPHP_OST_EVENT_CMD);
 634             Aml *st_cmd = aml_int(CPHP_OST_STATUS_CMD);
 635
 636             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 637             aml_append(method, aml_store(uid, cpu_selector));
 638             aml_append(method, aml_store(ev_cmd, cpu_cmd));
 639             aml_append(method, aml_store(aml_arg(1), cpu_data));
 640             aml_append(method, aml_store(st_cmd, cpu_cmd));
 641             aml_append(method, aml_store(aml_arg(2), cpu_data));
 642             aml_append(method, aml_release(ctrl_lock));
 643         }
 644         aml_append(cpus_dev, method);
 645
 646         /* build Processor object for each processor */
 647         for (i = 0; i < arch_ids->len; i++) {
 648             Aml *dev;
 649             Aml *uid = aml_int(i);
 650             GArray *madt_buf = g_array_new(0, 1, 1);
 651             int arch_id = arch_ids->cpus[i].arch_id;
 652
 653             if (opts.acpi_1_compatible && arch_id < 255) {
 654                 dev = aml_processor(i, 0, 0, CPU_NAME_FMT, i);
 655             } else {
 656                 dev = aml_device(CPU_NAME_FMT, i);
 657                 aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
 658                 aml_append(dev, aml_name_decl("_UID", uid));
 659             }
 660
 661             method = aml_method("_STA", 0, AML_SERIALIZED);
 662             aml_append(method, aml_return(aml_call1(CPU_STS_METHOD, uid)));
 663             aml_append(dev, method);
 664
 665             /* build _MAT object */
 666             build_madt_cpu(i, arch_ids, madt_buf, true); /* set enabled flag */
 667             aml_append(dev, aml_name_decl("_MAT",
 668                 aml_buffer(madt_buf->len, (uint8_t *)madt_buf->data)));
 669             g_array_free(madt_buf, true);
 670
 671             if (CPU(arch_ids->cpus[i].cpu) != first_cpu) {
 672                 method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
 673                 aml_append(method, aml_call1(CPU_EJECT_METHOD, uid));
 674                 aml_append(dev, method);
 675             }
 676
 677             method = aml_method("_OST", 3, AML_SERIALIZED);
 678             aml_append(method,
 679                 aml_call4(CPU_OST_METHOD, uid, aml_arg(0),
 680                           aml_arg(1), aml_arg(2))
 681             );
 682             aml_append(dev, method);
 683
 684             /* Linux guests discard SRAT info for non-present CPUs
 685              * as a result _PXM is required for all CPUs which might
 686              * be hot-plugged. For simplicity, add it for all CPUs.
 687              */
 688             if (arch_ids->cpus[i].props.has_node_id) {
 689                 aml_append(dev, aml_name_decl("_PXM",
 690                            aml_int(arch_ids->cpus[i].props.node_id)));
 691             }
 692
 693             aml_append(cpus_dev, dev);
 694         }
 695     }
 696     aml_append(sb_scope, cpus_dev);
 697     aml_append(table, sb_scope);
 698
 699     method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
 700     aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
 701     aml_append(table, method);
 702
 703     g_free(cphp_res_path);
 704 }