hw/acpi/cpu.c

   1 #include "qemu/osdep.h"
   2 #include "hw/boards.h"
   3 #include "migration/vmstate.h"
   4 #include "hw/acpi/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             info->has_device = true;
  40         }
  41     }
  42     return info;
  43 }
  44
  45 void acpi_cpu_ospm_status(CPUHotplugState *cpu_st, ACPIOSTInfoList ***list)
  46 {
  47     int i;
  48
  49     for (i = 0; i < cpu_st->dev_count; i++) {
  50         ACPIOSTInfoList *elem = g_new0(ACPIOSTInfoList, 1);
  51         elem->value = acpi_cpu_device_status(i, &cpu_st->devs[i]);
  52         elem->next = NULL;
  53         **list = elem;
  54         *list = &elem->next;
  55     }
  56 }
  57
  58 static uint64_t cpu_hotplug_rd(void *opaque, hwaddr addr, unsigned size)
  59 {
  60     uint64_t val = 0;
  61     CPUHotplugState *cpu_st = opaque;
  62     AcpiCpuStatus *cdev;
  63
  64     if (cpu_st->selector >= cpu_st->dev_count) {
  65         return val;
  66     }
  67
  68     cdev = &cpu_st->devs[cpu_st->selector];
  69     switch (addr) {
  70     case ACPI_CPU_FLAGS_OFFSET_RW: /* pack and return is_* fields */
  71         val |= cdev->cpu ? 1 : 0;
  72         val |= cdev->is_inserting ? 2 : 0;
  73         val |= cdev->is_removing  ? 4 : 0;
  74         val |= cdev->fw_remove  ? 16 : 0;
  75         trace_cpuhp_acpi_read_flags(cpu_st->selector, val);
  76         break;
  77     case ACPI_CPU_CMD_DATA_OFFSET_RW:
  78         switch (cpu_st->command) {
  79         case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
  80            val = cpu_st->selector;
  81            break;
  82         case CPHP_GET_CPU_ID_CMD:
  83            val = cdev->arch_id & 0xFFFFFFFF;
  84            break;
  85         default:
  86            break;
  87         }
  88         trace_cpuhp_acpi_read_cmd_data(cpu_st->selector, val);
  89         break;
  90     case ACPI_CPU_CMD_DATA2_OFFSET_R:
  91         switch (cpu_st->command) {
  92         case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
  93            val = 0;
  94            break;
  95         case CPHP_GET_CPU_ID_CMD:
  96            val = cdev->arch_id >> 32;
  97            break;
  98         default:
  99            break;
 100         }
 101         trace_cpuhp_acpi_read_cmd_data2(cpu_st->selector, val);
 102         break;
 103     default:
 104         break;
 105     }
 106     return val;
 107 }
 108
 109 static void cpu_hotplug_wr(void *opaque, hwaddr addr, uint64_t data,
 110                            unsigned int size)
 111 {
 112     CPUHotplugState *cpu_st = opaque;
 113     AcpiCpuStatus *cdev;
 114     ACPIOSTInfo *info;
 115
 116     assert(cpu_st->dev_count);
 117
 118     if (addr) {
 119         if (cpu_st->selector >= cpu_st->dev_count) {
 120             trace_cpuhp_acpi_invalid_idx_selected(cpu_st->selector);
 121             return;
 122         }
 123     }
 124
 125     switch (addr) {
 126     case ACPI_CPU_SELECTOR_OFFSET_WR: /* current CPU selector */
 127         cpu_st->selector = data;
 128         trace_cpuhp_acpi_write_idx(cpu_st->selector);
 129         break;
 130     case ACPI_CPU_FLAGS_OFFSET_RW: /* set is_* fields  */
 131         cdev = &cpu_st->devs[cpu_st->selector];
 132         if (data & 2) { /* clear insert event */
 133             cdev->is_inserting = false;
 134             trace_cpuhp_acpi_clear_inserting_evt(cpu_st->selector);
 135         } else if (data & 4) { /* clear remove event */
 136             cdev->is_removing = false;
 137             trace_cpuhp_acpi_clear_remove_evt(cpu_st->selector);
 138         } else if (data & 8) {
 139             DeviceState *dev = NULL;
 140             HotplugHandler *hotplug_ctrl = NULL;
 141
 142             if (!cdev->cpu || cdev->cpu == first_cpu) {
 143                 trace_cpuhp_acpi_ejecting_invalid_cpu(cpu_st->selector);
 144                 break;
 145             }
 146
 147             trace_cpuhp_acpi_ejecting_cpu(cpu_st->selector);
 148             dev = DEVICE(cdev->cpu);
 149             hotplug_ctrl = qdev_get_hotplug_handler(dev);
 150             hotplug_handler_unplug(hotplug_ctrl, dev, NULL);
 151             object_unparent(OBJECT(dev));
 152             cdev->fw_remove = false;
 153         } else if (data & 16) {
 154             if (!cdev->cpu || cdev->cpu == first_cpu) {
 155                 trace_cpuhp_acpi_fw_remove_invalid_cpu(cpu_st->selector);
 156                 break;
 157             }
 158             trace_cpuhp_acpi_fw_remove_cpu(cpu_st->selector);
 159             cdev->fw_remove = true;
 160         }
 161         break;
 162     case ACPI_CPU_CMD_OFFSET_WR:
 163         trace_cpuhp_acpi_write_cmd(cpu_st->selector, data);
 164         if (data < CPHP_CMD_MAX) {
 165             cpu_st->command = data;
 166             if (cpu_st->command == CPHP_GET_NEXT_CPU_WITH_EVENT_CMD) {
 167                 uint32_t iter = cpu_st->selector;
 168
 169                 do {
 170                     cdev = &cpu_st->devs[iter];
 171                     if (cdev->is_inserting || cdev->is_removing ||
 172                         cdev->fw_remove) {
 173                         cpu_st->selector = iter;
 174                         trace_cpuhp_acpi_cpu_has_events(cpu_st->selector,
 175                             cdev->is_inserting, cdev->is_removing);
 176                         break;
 177                     }
 178                     iter = iter + 1 < cpu_st->dev_count ? iter + 1 : 0;
 179                 } while (iter != cpu_st->selector);
 180             }
 181         }
 182         break;
 183     case ACPI_CPU_CMD_DATA_OFFSET_RW:
 184         switch (cpu_st->command) {
 185         case CPHP_OST_EVENT_CMD: {
 186            cdev = &cpu_st->devs[cpu_st->selector];
 187            cdev->ost_event = data;
 188            trace_cpuhp_acpi_write_ost_ev(cpu_st->selector, cdev->ost_event);
 189            break;
 190         }
 191         case CPHP_OST_STATUS_CMD: {
 192            cdev = &cpu_st->devs[cpu_st->selector];
 193            cdev->ost_status = data;
 194            info = acpi_cpu_device_status(cpu_st->selector, cdev);
 195            qapi_event_send_acpi_device_ost(info);
 196            qapi_free_ACPIOSTInfo(info);
 197            trace_cpuhp_acpi_write_ost_status(cpu_st->selector,
 198                                              cdev->ost_status);
 199            break;
 200         }
 201         default:
 202            break;
 203         }
 204         break;
 205     default:
 206         break;
 207     }
 208 }
 209
 210 static const MemoryRegionOps cpu_hotplug_ops = {
 211     .read = cpu_hotplug_rd,
 212     .write = cpu_hotplug_wr,
 213     .endianness = DEVICE_LITTLE_ENDIAN,
 214     .valid = {
 215         .min_access_size = 1,
 216         .max_access_size = 4,
 217     },
 218 };
 219
 220 void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
 221                          CPUHotplugState *state, hwaddr base_addr)
 222 {
 223     MachineState *machine = MACHINE(qdev_get_machine());
 224     MachineClass *mc = MACHINE_GET_CLASS(machine);
 225     const CPUArchIdList *id_list;
 226     int i;
 227
 228     assert(mc->possible_cpu_arch_ids);
 229     id_list = mc->possible_cpu_arch_ids(machine);
 230     state->dev_count = id_list->len;
 231     state->devs = g_new0(typeof(*state->devs), state->dev_count);
 232     for (i = 0; i < id_list->len; i++) {
 233         state->devs[i].cpu =  CPU(id_list->cpus[i].cpu);
 234         state->devs[i].arch_id = id_list->cpus[i].arch_id;
 235     }
 236     memory_region_init_io(&state->ctrl_reg, owner, &cpu_hotplug_ops, state,
 237                           "acpi-cpu-hotplug", ACPI_CPU_HOTPLUG_REG_LEN);
 238     memory_region_add_subregion(as, base_addr, &state->ctrl_reg);
 239 }
 240
 241 static AcpiCpuStatus *get_cpu_status(CPUHotplugState *cpu_st, DeviceState *dev)
 242 {
 243     CPUClass *k = CPU_GET_CLASS(dev);
 244     uint64_t cpu_arch_id = k->get_arch_id(CPU(dev));
 245     int i;
 246
 247     for (i = 0; i < cpu_st->dev_count; i++) {
 248         if (cpu_arch_id == cpu_st->devs[i].arch_id) {
 249             return &cpu_st->devs[i];
 250         }
 251     }
 252     return NULL;
 253 }
 254
 255 void acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
 256                       CPUHotplugState *cpu_st, 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 = CPU(dev);
 266     if (dev->hotplugged) {
 267         cdev->is_inserting = true;
 268         acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 269     }
 270 }
 271
 272 void acpi_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
 273                                 CPUHotplugState *cpu_st,
 274                                 DeviceState *dev, Error **errp)
 275 {
 276     AcpiCpuStatus *cdev;
 277
 278     cdev = get_cpu_status(cpu_st, dev);
 279     if (!cdev) {
 280         return;
 281     }
 282
 283     cdev->is_removing = true;
 284     acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 285 }
 286
 287 void acpi_cpu_unplug_cb(CPUHotplugState *cpu_st,
 288                         DeviceState *dev, Error **errp)
 289 {
 290     AcpiCpuStatus *cdev;
 291
 292     cdev = get_cpu_status(cpu_st, dev);
 293     if (!cdev) {
 294         return;
 295     }
 296
 297     cdev->cpu = NULL;
 298 }
 299
 300 static const VMStateDescription vmstate_cpuhp_sts = {
 301     .name = "CPU hotplug device state",
 302     .version_id = 1,
 303     .minimum_version_id = 1,
 304     .minimum_version_id_old = 1,
 305     .fields      = (VMStateField[]) {
 306         VMSTATE_BOOL(is_inserting, AcpiCpuStatus),
 307         VMSTATE_BOOL(is_removing, AcpiCpuStatus),
 308         VMSTATE_UINT32(ost_event, AcpiCpuStatus),
 309         VMSTATE_UINT32(ost_status, AcpiCpuStatus),
 310         VMSTATE_END_OF_LIST()
 311     }
 312 };
 313
 314 const VMStateDescription vmstate_cpu_hotplug = {
 315     .name = "CPU hotplug state",
 316     .version_id = 1,
 317     .minimum_version_id = 1,
 318     .minimum_version_id_old = 1,
 319     .fields      = (VMStateField[]) {
 320         VMSTATE_UINT32(selector, CPUHotplugState),
 321         VMSTATE_UINT8(command, CPUHotplugState),
 322         VMSTATE_STRUCT_VARRAY_POINTER_UINT32(devs, CPUHotplugState, dev_count,
 323                                              vmstate_cpuhp_sts, AcpiCpuStatus),
 324         VMSTATE_END_OF_LIST()
 325     }
 326 };
 327
 328 #define CPU_NAME_FMT      "C%.03X"
 329 #define CPUHP_RES_DEVICE  "PRES"
 330 #define CPU_LOCK          "CPLK"
 331 #define CPU_STS_METHOD    "CSTA"
 332 #define CPU_SCAN_METHOD   "CSCN"
 333 #define CPU_NOTIFY_METHOD "CTFY"
 334 #define CPU_EJECT_METHOD  "CEJ0"
 335 #define CPU_OST_METHOD    "COST"
 336 #define CPU_ADDED_LIST    "CNEW"
 337
 338 #define CPU_ENABLED       "CPEN"
 339 #define CPU_SELECTOR      "CSEL"
 340 #define CPU_COMMAND       "CCMD"
 341 #define CPU_DATA          "CDAT"
 342 #define CPU_INSERT_EVENT  "CINS"
 343 #define CPU_REMOVE_EVENT  "CRMV"
 344 #define CPU_EJECT_EVENT   "CEJ0"
 345 #define CPU_FW_EJECT_EVENT "CEJF"
 346
 347 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
 348                     hwaddr io_base,
 349                     const char *res_root,
 350                     const char *event_handler_method)
 351 {
 352     Aml *ifctx;
 353     Aml *field;
 354     Aml *method;
 355     Aml *cpu_ctrl_dev;
 356     Aml *cpus_dev;
 357     Aml *zero = aml_int(0);
 358     Aml *one = aml_int(1);
 359     Aml *sb_scope = aml_scope("_SB");
 360     MachineClass *mc = MACHINE_GET_CLASS(machine);
 361     const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(machine);
 362     char *cphp_res_path = g_strdup_printf("%s." CPUHP_RES_DEVICE, res_root);
 363     Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
 364     AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 365     AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
 366
 367     cpu_ctrl_dev = aml_device("%s", cphp_res_path);
 368     {
 369         Aml *crs;
 370
 371         aml_append(cpu_ctrl_dev,
 372             aml_name_decl("_HID", aml_eisaid("PNP0A06")));
 373         aml_append(cpu_ctrl_dev,
 374             aml_name_decl("_UID", aml_string("CPU Hotplug resources")));
 375         aml_append(cpu_ctrl_dev, aml_mutex(CPU_LOCK, 0));
 376
 377         crs = aml_resource_template();
 378         aml_append(crs, aml_io(AML_DECODE16, io_base, io_base, 1,
 379                                ACPI_CPU_HOTPLUG_REG_LEN));
 380         aml_append(cpu_ctrl_dev, aml_name_decl("_CRS", crs));
 381
 382         /* declare CPU hotplug MMIO region with related access fields */
 383         aml_append(cpu_ctrl_dev,
 384             aml_operation_region("PRST", AML_SYSTEM_IO, aml_int(io_base),
 385                                  ACPI_CPU_HOTPLUG_REG_LEN));
 386
 387         field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK,
 388                           AML_WRITE_AS_ZEROS);
 389         aml_append(field, aml_reserved_field(ACPI_CPU_FLAGS_OFFSET_RW * 8));
 390         /* 1 if enabled, read only */
 391         aml_append(field, aml_named_field(CPU_ENABLED, 1));
 392         /* (read) 1 if has a insert event. (write) 1 to clear event */
 393         aml_append(field, aml_named_field(CPU_INSERT_EVENT, 1));
 394         /* (read) 1 if has a remove event. (write) 1 to clear event */
 395         aml_append(field, aml_named_field(CPU_REMOVE_EVENT, 1));
 396         /* initiates device eject, write only */
 397         aml_append(field, aml_named_field(CPU_EJECT_EVENT, 1));
 398         /* tell firmware to do device eject, write only */
 399         aml_append(field, aml_named_field(CPU_FW_EJECT_EVENT, 1));
 400         aml_append(field, aml_reserved_field(3));
 401         aml_append(field, aml_named_field(CPU_COMMAND, 8));
 402         aml_append(cpu_ctrl_dev, field);
 403
 404         field = aml_field("PRST", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
 405         /* CPU selector, write only */
 406         aml_append(field, aml_named_field(CPU_SELECTOR, 32));
 407         /* flags + cmd + 2byte align */
 408         aml_append(field, aml_reserved_field(4 * 8));
 409         aml_append(field, aml_named_field(CPU_DATA, 32));
 410         aml_append(cpu_ctrl_dev, field);
 411
 412         if (opts.has_legacy_cphp) {
 413             method = aml_method("_INI", 0, AML_SERIALIZED);
 414             /* switch off legacy CPU hotplug HW and use new one,
 415              * on reboot system is in new mode and writing 0
 416              * in CPU_SELECTOR selects BSP, which is NOP at
 417              * the time _INI is called */
 418             aml_append(method, aml_store(zero, aml_name(CPU_SELECTOR)));
 419             aml_append(cpu_ctrl_dev, method);
 420         }
 421     }
 422     aml_append(sb_scope, cpu_ctrl_dev);
 423
 424     cpus_dev = aml_device("\\_SB.CPUS");
 425     {
 426         int i;
 427         Aml *ctrl_lock = aml_name("%s.%s", cphp_res_path, CPU_LOCK);
 428         Aml *cpu_selector = aml_name("%s.%s", cphp_res_path, CPU_SELECTOR);
 429         Aml *is_enabled = aml_name("%s.%s", cphp_res_path, CPU_ENABLED);
 430         Aml *cpu_cmd = aml_name("%s.%s", cphp_res_path, CPU_COMMAND);
 431         Aml *cpu_data = aml_name("%s.%s", cphp_res_path, CPU_DATA);
 432         Aml *ins_evt = aml_name("%s.%s", cphp_res_path, CPU_INSERT_EVENT);
 433         Aml *rm_evt = aml_name("%s.%s", cphp_res_path, CPU_REMOVE_EVENT);
 434         Aml *ej_evt = aml_name("%s.%s", cphp_res_path, CPU_EJECT_EVENT);
 435         Aml *fw_ej_evt = aml_name("%s.%s", cphp_res_path, CPU_FW_EJECT_EVENT);
 436
 437         aml_append(cpus_dev, aml_name_decl("_HID", aml_string("ACPI0010")));
 438         aml_append(cpus_dev, aml_name_decl("_CID", aml_eisaid("PNP0A05")));
 439
 440         method = aml_method(CPU_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
 441         for (i = 0; i < arch_ids->len; i++) {
 442             Aml *cpu = aml_name(CPU_NAME_FMT, i);
 443             Aml *uid = aml_arg(0);
 444             Aml *event = aml_arg(1);
 445
 446             ifctx = aml_if(aml_equal(uid, aml_int(i)));
 447             {
 448                 aml_append(ifctx, aml_notify(cpu, event));
 449             }
 450             aml_append(method, ifctx);
 451         }
 452         aml_append(cpus_dev, method);
 453
 454         method = aml_method(CPU_STS_METHOD, 1, AML_SERIALIZED);
 455         {
 456             Aml *idx = aml_arg(0);
 457             Aml *sta = aml_local(0);
 458
 459             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 460             aml_append(method, aml_store(idx, cpu_selector));
 461             aml_append(method, aml_store(zero, sta));
 462             ifctx = aml_if(aml_equal(is_enabled, one));
 463             {
 464                 aml_append(ifctx, aml_store(aml_int(0xF), sta));
 465             }
 466             aml_append(method, ifctx);
 467             aml_append(method, aml_release(ctrl_lock));
 468             aml_append(method, aml_return(sta));
 469         }
 470         aml_append(cpus_dev, method);
 471
 472         method = aml_method(CPU_EJECT_METHOD, 1, AML_SERIALIZED);
 473         {
 474             Aml *idx = aml_arg(0);
 475
 476             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 477             aml_append(method, aml_store(idx, cpu_selector));
 478             if (opts.fw_unplugs_cpu) {
 479                 aml_append(method, aml_store(one, fw_ej_evt));
 480                 aml_append(method, aml_store(aml_int(OVMF_CPUHP_SMI_CMD),
 481                            aml_name("%s", opts.smi_path)));
 482             } else {
 483                 aml_append(method, aml_store(one, ej_evt));
 484             }
 485             aml_append(method, aml_release(ctrl_lock));
 486         }
 487         aml_append(cpus_dev, method);
 488
 489         method = aml_method(CPU_SCAN_METHOD, 0, AML_SERIALIZED);
 490         {
 491             const uint8_t max_cpus_per_pass = 255;
 492             Aml *else_ctx;
 493             Aml *while_ctx, *while_ctx2;
 494             Aml *has_event = aml_local(0);
 495             Aml *dev_chk = aml_int(1);
 496             Aml *eject_req = aml_int(3);
 497             Aml *next_cpu_cmd = aml_int(CPHP_GET_NEXT_CPU_WITH_EVENT_CMD);
 498             Aml *num_added_cpus = aml_local(1);
 499             Aml *cpu_idx = aml_local(2);
 500             Aml *uid = aml_local(3);
 501             Aml *has_job = aml_local(4);
 502             Aml *new_cpus = aml_name(CPU_ADDED_LIST);
 503
 504             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 505
 506             /*
 507              * Windows versions newer than XP (including Windows 10/Windows
 508              * Server 2019), do support* VarPackageOp but, it is cripled to hold
 509              * the same elements number as old PackageOp.
 510              * For compatibility with Windows XP (so it won't crash) use ACPI1.0
 511              * PackageOp which can hold max 255 elements.
 512              *
 513              * use named package as old Windows don't support it in local var
 514              */
 515             aml_append(method, aml_name_decl(CPU_ADDED_LIST,
 516                                              aml_package(max_cpus_per_pass)));
 517
 518             aml_append(method, aml_store(zero, uid));
 519             aml_append(method, aml_store(one, has_job));
 520             /*
 521              * CPU_ADDED_LIST can hold limited number of elements, outer loop
 522              * allows to process CPUs in batches which let us to handle more
 523              * CPUs than CPU_ADDED_LIST can hold.
 524              */
 525             while_ctx2 = aml_while(aml_equal(has_job, one));
 526             {
 527                 aml_append(while_ctx2, aml_store(zero, has_job));
 528
 529                 aml_append(while_ctx2, aml_store(one, has_event));
 530                 aml_append(while_ctx2, aml_store(zero, num_added_cpus));
 531
 532                 /*
 533                  * Scan CPUs, till there are CPUs with events or
 534                  * CPU_ADDED_LIST capacity is exhausted
 535                  */
 536                 while_ctx = aml_while(aml_land(aml_equal(has_event, one),
 537                                       aml_lless(uid, aml_int(arch_ids->len))));
 538                 {
 539                      /*
 540                       * clear loop exit condition, ins_evt/rm_evt checks will
 541                       * set it to 1 while next_cpu_cmd returns a CPU with events
 542                       */
 543                      aml_append(while_ctx, aml_store(zero, has_event));
 544
 545                      aml_append(while_ctx, aml_store(uid, cpu_selector));
 546                      aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd));
 547
 548                      /*
 549                       * wrap around case, scan is complete, exit loop.
 550                       * It happens since events are not cleared in scan loop,
 551                       * so next_cpu_cmd continues to find already processed CPUs
 552                       */
 553                      ifctx = aml_if(aml_lless(cpu_data, uid));
 554                      {
 555                          aml_append(ifctx, aml_break());
 556                      }
 557                      aml_append(while_ctx, ifctx);
 558
 559                      /*
 560                       * if CPU_ADDED_LIST is full, exit inner loop and process
 561                       * collected CPUs
 562                       */
 563                      ifctx = aml_if(
 564                          aml_equal(num_added_cpus, aml_int(max_cpus_per_pass)));
 565                      {
 566                          aml_append(ifctx, aml_store(one, has_job));
 567                          aml_append(ifctx, aml_break());
 568                      }
 569                      aml_append(while_ctx, ifctx);
 570
 571                      aml_append(while_ctx, aml_store(cpu_data, uid));
 572                      ifctx = aml_if(aml_equal(ins_evt, one));
 573                      {
 574                          /* cache added CPUs to Notify/Wakeup later */
 575                          aml_append(ifctx, aml_store(uid,
 576                              aml_index(new_cpus, num_added_cpus)));
 577                          aml_append(ifctx, aml_increment(num_added_cpus));
 578                          aml_append(ifctx, aml_store(one, has_event));
 579                      }
 580                      aml_append(while_ctx, ifctx);
 581                      else_ctx = aml_else();
 582                      ifctx = aml_if(aml_equal(rm_evt, one));
 583                      {
 584                          aml_append(ifctx,
 585                              aml_call2(CPU_NOTIFY_METHOD, uid, eject_req));
 586                          aml_append(ifctx, aml_store(one, rm_evt));
 587                          aml_append(ifctx, aml_store(one, has_event));
 588                      }
 589                      aml_append(else_ctx, ifctx);
 590                      aml_append(while_ctx, else_ctx);
 591                      aml_append(while_ctx, aml_increment(uid));
 592                 }
 593                 aml_append(while_ctx2, while_ctx);
 594
 595                 /*
 596                  * in case FW negotiated ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT,
 597                  * make upcall to FW, so it can pull in new CPUs before
 598                  * OS is notified and wakes them up
 599                  */
 600                 if (opts.smi_path) {
 601                     ifctx = aml_if(aml_lgreater(num_added_cpus, zero));
 602                     {
 603                         aml_append(ifctx, aml_store(aml_int(OVMF_CPUHP_SMI_CMD),
 604                             aml_name("%s", opts.smi_path)));
 605                     }
 606                     aml_append(while_ctx2, ifctx);
 607                 }
 608
 609                 /* Notify OSPM about new CPUs and clear insert events */
 610                 aml_append(while_ctx2, aml_store(zero, cpu_idx));
 611                 while_ctx = aml_while(aml_lless(cpu_idx, num_added_cpus));
 612                 {
 613                     aml_append(while_ctx,
 614                         aml_store(aml_derefof(aml_index(new_cpus, cpu_idx)),
 615                                   uid));
 616                     aml_append(while_ctx,
 617                         aml_call2(CPU_NOTIFY_METHOD, uid, dev_chk));
 618                     aml_append(while_ctx, aml_store(uid, aml_debug()));
 619                     aml_append(while_ctx, aml_store(uid, cpu_selector));
 620                     aml_append(while_ctx, aml_store(one, ins_evt));
 621                     aml_append(while_ctx, aml_increment(cpu_idx));
 622                 }
 623                 aml_append(while_ctx2, while_ctx);
 624                 /*
 625                  * If another batch is needed, then it will resume scanning
 626                  * exactly at -- and not after -- the last CPU that's currently
 627                  * in CPU_ADDED_LIST. In other words, the last CPU in
 628                  * CPU_ADDED_LIST is going to be re-checked. That's OK: we've
 629                  * just cleared the insert event for *all* CPUs in
 630                  * CPU_ADDED_LIST, including the last one. So the scan will
 631                  * simply seek past it.
 632                  */
 633             }
 634             aml_append(method, while_ctx2);
 635             aml_append(method, aml_release(ctrl_lock));
 636         }
 637         aml_append(cpus_dev, method);
 638
 639         method = aml_method(CPU_OST_METHOD, 4, AML_SERIALIZED);
 640         {
 641             Aml *uid = aml_arg(0);
 642             Aml *ev_cmd = aml_int(CPHP_OST_EVENT_CMD);
 643             Aml *st_cmd = aml_int(CPHP_OST_STATUS_CMD);
 644
 645             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 646             aml_append(method, aml_store(uid, cpu_selector));
 647             aml_append(method, aml_store(ev_cmd, cpu_cmd));
 648             aml_append(method, aml_store(aml_arg(1), cpu_data));
 649             aml_append(method, aml_store(st_cmd, cpu_cmd));
 650             aml_append(method, aml_store(aml_arg(2), cpu_data));
 651             aml_append(method, aml_release(ctrl_lock));
 652         }
 653         aml_append(cpus_dev, method);
 654
 655         /* build Processor object for each processor */
 656         for (i = 0; i < arch_ids->len; i++) {
 657             Aml *dev;
 658             Aml *uid = aml_int(i);
 659             GArray *madt_buf = g_array_new(0, 1, 1);
 660             int arch_id = arch_ids->cpus[i].arch_id;
 661
 662             if (opts.acpi_1_compatible && arch_id < 255) {
 663                 dev = aml_processor(i, 0, 0, CPU_NAME_FMT, i);
 664             } else {
 665                 dev = aml_device(CPU_NAME_FMT, i);
 666                 aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
 667                 aml_append(dev, aml_name_decl("_UID", uid));
 668             }
 669
 670             method = aml_method("_STA", 0, AML_SERIALIZED);
 671             aml_append(method, aml_return(aml_call1(CPU_STS_METHOD, uid)));
 672             aml_append(dev, method);
 673
 674             /* build _MAT object */
 675             assert(adevc && adevc->madt_cpu);
 676             adevc->madt_cpu(adev, i, arch_ids, madt_buf);
 677             switch (madt_buf->data[0]) {
 678             case ACPI_APIC_PROCESSOR: {
 679                 AcpiMadtProcessorApic *apic = (void *)madt_buf->data;
 680                 apic->flags = cpu_to_le32(1);
 681                 break;
 682             }
 683             case ACPI_APIC_LOCAL_X2APIC: {
 684                 AcpiMadtProcessorX2Apic *apic = (void *)madt_buf->data;
 685                 apic->flags = cpu_to_le32(1);
 686                 break;
 687             }
 688             default:
 689                 assert(0);
 690             }
 691             aml_append(dev, aml_name_decl("_MAT",
 692                 aml_buffer(madt_buf->len, (uint8_t *)madt_buf->data)));
 693             g_array_free(madt_buf, true);
 694
 695             if (CPU(arch_ids->cpus[i].cpu) != first_cpu) {
 696                 method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
 697                 aml_append(method, aml_call1(CPU_EJECT_METHOD, uid));
 698                 aml_append(dev, method);
 699             }
 700
 701             method = aml_method("_OST", 3, AML_SERIALIZED);
 702             aml_append(method,
 703                 aml_call4(CPU_OST_METHOD, uid, aml_arg(0),
 704                           aml_arg(1), aml_arg(2))
 705             );
 706             aml_append(dev, method);
 707
 708             /* Linux guests discard SRAT info for non-present CPUs
 709              * as a result _PXM is required for all CPUs which might
 710              * be hot-plugged. For simplicity, add it for all CPUs.
 711              */
 712             if (arch_ids->cpus[i].props.has_node_id) {
 713                 aml_append(dev, aml_name_decl("_PXM",
 714                            aml_int(arch_ids->cpus[i].props.node_id)));
 715             }
 716
 717             aml_append(cpus_dev, dev);
 718         }
 719     }
 720     aml_append(sb_scope, cpus_dev);
 721     aml_append(table, sb_scope);
 722
 723     method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
 724     aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
 725     aml_append(table, method);
 726
 727     g_free(cphp_res_path);
 728 }