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     ACPIOSTInfoList ***tail = list;
  48     int i;
  49
  50     for (i = 0; i < cpu_st->dev_count; i++) {
  51         QAPI_LIST_APPEND(*tail, acpi_cpu_device_status(i, &cpu_st->devs[i]));
  52     }
  53 }
  54
  55 static uint64_t cpu_hotplug_rd(void *opaque, hwaddr addr, unsigned size)
  56 {
  57     uint64_t val = 0;
  58     CPUHotplugState *cpu_st = opaque;
  59     AcpiCpuStatus *cdev;
  60
  61     if (cpu_st->selector >= cpu_st->dev_count) {
  62         return val;
  63     }
  64
  65     cdev = &cpu_st->devs[cpu_st->selector];
  66     switch (addr) {
  67     case ACPI_CPU_FLAGS_OFFSET_RW: /* pack and return is_* fields */
  68         val |= cdev->cpu ? 1 : 0;
  69         val |= cdev->is_inserting ? 2 : 0;
  70         val |= cdev->is_removing  ? 4 : 0;
  71         val |= cdev->fw_remove  ? 16 : 0;
  72         trace_cpuhp_acpi_read_flags(cpu_st->selector, val);
  73         break;
  74     case ACPI_CPU_CMD_DATA_OFFSET_RW:
  75         switch (cpu_st->command) {
  76         case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
  77            val = cpu_st->selector;
  78            break;
  79         case CPHP_GET_CPU_ID_CMD:
  80            val = cdev->arch_id & 0xFFFFFFFF;
  81            break;
  82         default:
  83            break;
  84         }
  85         trace_cpuhp_acpi_read_cmd_data(cpu_st->selector, val);
  86         break;
  87     case ACPI_CPU_CMD_DATA2_OFFSET_R:
  88         switch (cpu_st->command) {
  89         case CPHP_GET_NEXT_CPU_WITH_EVENT_CMD:
  90            val = 0;
  91            break;
  92         case CPHP_GET_CPU_ID_CMD:
  93            val = cdev->arch_id >> 32;
  94            break;
  95         default:
  96            break;
  97         }
  98         trace_cpuhp_acpi_read_cmd_data2(cpu_st->selector, val);
  99         break;
 100     default:
 101         break;
 102     }
 103     return val;
 104 }
 105
 106 static void cpu_hotplug_wr(void *opaque, hwaddr addr, uint64_t data,
 107                            unsigned int size)
 108 {
 109     CPUHotplugState *cpu_st = opaque;
 110     AcpiCpuStatus *cdev;
 111     ACPIOSTInfo *info;
 112
 113     assert(cpu_st->dev_count);
 114
 115     if (addr) {
 116         if (cpu_st->selector >= cpu_st->dev_count) {
 117             trace_cpuhp_acpi_invalid_idx_selected(cpu_st->selector);
 118             return;
 119         }
 120     }
 121
 122     switch (addr) {
 123     case ACPI_CPU_SELECTOR_OFFSET_WR: /* current CPU selector */
 124         cpu_st->selector = data;
 125         trace_cpuhp_acpi_write_idx(cpu_st->selector);
 126         break;
 127     case ACPI_CPU_FLAGS_OFFSET_RW: /* set is_* fields  */
 128         cdev = &cpu_st->devs[cpu_st->selector];
 129         if (data & 2) { /* clear insert event */
 130             cdev->is_inserting = false;
 131             trace_cpuhp_acpi_clear_inserting_evt(cpu_st->selector);
 132         } else if (data & 4) { /* clear remove event */
 133             cdev->is_removing = false;
 134             trace_cpuhp_acpi_clear_remove_evt(cpu_st->selector);
 135         } else if (data & 8) {
 136             DeviceState *dev = NULL;
 137             HotplugHandler *hotplug_ctrl = NULL;
 138
 139             if (!cdev->cpu || cdev->cpu == first_cpu) {
 140                 trace_cpuhp_acpi_ejecting_invalid_cpu(cpu_st->selector);
 141                 break;
 142             }
 143
 144             trace_cpuhp_acpi_ejecting_cpu(cpu_st->selector);
 145             dev = DEVICE(cdev->cpu);
 146             hotplug_ctrl = qdev_get_hotplug_handler(dev);
 147             hotplug_handler_unplug(hotplug_ctrl, dev, NULL);
 148             object_unparent(OBJECT(dev));
 149             cdev->fw_remove = false;
 150         } else if (data & 16) {
 151             if (!cdev->cpu || cdev->cpu == first_cpu) {
 152                 trace_cpuhp_acpi_fw_remove_invalid_cpu(cpu_st->selector);
 153                 break;
 154             }
 155             trace_cpuhp_acpi_fw_remove_cpu(cpu_st->selector);
 156             cdev->fw_remove = true;
 157         }
 158         break;
 159     case ACPI_CPU_CMD_OFFSET_WR:
 160         trace_cpuhp_acpi_write_cmd(cpu_st->selector, data);
 161         if (data < CPHP_CMD_MAX) {
 162             cpu_st->command = data;
 163             if (cpu_st->command == CPHP_GET_NEXT_CPU_WITH_EVENT_CMD) {
 164                 uint32_t iter = cpu_st->selector;
 165
 166                 do {
 167                     cdev = &cpu_st->devs[iter];
 168                     if (cdev->is_inserting || cdev->is_removing ||
 169                         cdev->fw_remove) {
 170                         cpu_st->selector = iter;
 171                         trace_cpuhp_acpi_cpu_has_events(cpu_st->selector,
 172                             cdev->is_inserting, cdev->is_removing);
 173                         break;
 174                     }
 175                     iter = iter + 1 < cpu_st->dev_count ? iter + 1 : 0;
 176                 } while (iter != cpu_st->selector);
 177             }
 178         }
 179         break;
 180     case ACPI_CPU_CMD_DATA_OFFSET_RW:
 181         switch (cpu_st->command) {
 182         case CPHP_OST_EVENT_CMD: {
 183            cdev = &cpu_st->devs[cpu_st->selector];
 184            cdev->ost_event = data;
 185            trace_cpuhp_acpi_write_ost_ev(cpu_st->selector, cdev->ost_event);
 186            break;
 187         }
 188         case CPHP_OST_STATUS_CMD: {
 189            cdev = &cpu_st->devs[cpu_st->selector];
 190            cdev->ost_status = data;
 191            info = acpi_cpu_device_status(cpu_st->selector, cdev);
 192            qapi_event_send_acpi_device_ost(info);
 193            qapi_free_ACPIOSTInfo(info);
 194            trace_cpuhp_acpi_write_ost_status(cpu_st->selector,
 195                                              cdev->ost_status);
 196            break;
 197         }
 198         default:
 199            break;
 200         }
 201         break;
 202     default:
 203         break;
 204     }
 205 }
 206
 207 static const MemoryRegionOps cpu_hotplug_ops = {
 208     .read = cpu_hotplug_rd,
 209     .write = cpu_hotplug_wr,
 210     .endianness = DEVICE_LITTLE_ENDIAN,
 211     .valid = {
 212         .min_access_size = 1,
 213         .max_access_size = 4,
 214     },
 215 };
 216
 217 void cpu_hotplug_hw_init(MemoryRegion *as, Object *owner,
 218                          CPUHotplugState *state, hwaddr base_addr)
 219 {
 220     MachineState *machine = MACHINE(qdev_get_machine());
 221     MachineClass *mc = MACHINE_GET_CLASS(machine);
 222     const CPUArchIdList *id_list;
 223     int i;
 224
 225     assert(mc->possible_cpu_arch_ids);
 226     id_list = mc->possible_cpu_arch_ids(machine);
 227     state->dev_count = id_list->len;
 228     state->devs = g_new0(typeof(*state->devs), state->dev_count);
 229     for (i = 0; i < id_list->len; i++) {
 230         state->devs[i].cpu =  CPU(id_list->cpus[i].cpu);
 231         state->devs[i].arch_id = id_list->cpus[i].arch_id;
 232     }
 233     memory_region_init_io(&state->ctrl_reg, owner, &cpu_hotplug_ops, state,
 234                           "acpi-cpu-hotplug", ACPI_CPU_HOTPLUG_REG_LEN);
 235     memory_region_add_subregion(as, base_addr, &state->ctrl_reg);
 236 }
 237
 238 static AcpiCpuStatus *get_cpu_status(CPUHotplugState *cpu_st, DeviceState *dev)
 239 {
 240     CPUClass *k = CPU_GET_CLASS(dev);
 241     uint64_t cpu_arch_id = k->get_arch_id(CPU(dev));
 242     int i;
 243
 244     for (i = 0; i < cpu_st->dev_count; i++) {
 245         if (cpu_arch_id == cpu_st->devs[i].arch_id) {
 246             return &cpu_st->devs[i];
 247         }
 248     }
 249     return NULL;
 250 }
 251
 252 void acpi_cpu_plug_cb(HotplugHandler *hotplug_dev,
 253                       CPUHotplugState *cpu_st, DeviceState *dev, Error **errp)
 254 {
 255     AcpiCpuStatus *cdev;
 256
 257     cdev = get_cpu_status(cpu_st, dev);
 258     if (!cdev) {
 259         return;
 260     }
 261
 262     cdev->cpu = CPU(dev);
 263     if (dev->hotplugged) {
 264         cdev->is_inserting = true;
 265         acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 266     }
 267 }
 268
 269 void acpi_cpu_unplug_request_cb(HotplugHandler *hotplug_dev,
 270                                 CPUHotplugState *cpu_st,
 271                                 DeviceState *dev, Error **errp)
 272 {
 273     AcpiCpuStatus *cdev;
 274
 275     cdev = get_cpu_status(cpu_st, dev);
 276     if (!cdev) {
 277         return;
 278     }
 279
 280     cdev->is_removing = true;
 281     acpi_send_event(DEVICE(hotplug_dev), ACPI_CPU_HOTPLUG_STATUS);
 282 }
 283
 284 void acpi_cpu_unplug_cb(CPUHotplugState *cpu_st,
 285                         DeviceState *dev, Error **errp)
 286 {
 287     AcpiCpuStatus *cdev;
 288
 289     cdev = get_cpu_status(cpu_st, dev);
 290     if (!cdev) {
 291         return;
 292     }
 293
 294     cdev->cpu = NULL;
 295 }
 296
 297 static const VMStateDescription vmstate_cpuhp_sts = {
 298     .name = "CPU hotplug device state",
 299     .version_id = 1,
 300     .minimum_version_id = 1,
 301     .minimum_version_id_old = 1,
 302     .fields      = (VMStateField[]) {
 303         VMSTATE_BOOL(is_inserting, AcpiCpuStatus),
 304         VMSTATE_BOOL(is_removing, AcpiCpuStatus),
 305         VMSTATE_UINT32(ost_event, AcpiCpuStatus),
 306         VMSTATE_UINT32(ost_status, AcpiCpuStatus),
 307         VMSTATE_END_OF_LIST()
 308     }
 309 };
 310
 311 const VMStateDescription vmstate_cpu_hotplug = {
 312     .name = "CPU hotplug state",
 313     .version_id = 1,
 314     .minimum_version_id = 1,
 315     .minimum_version_id_old = 1,
 316     .fields      = (VMStateField[]) {
 317         VMSTATE_UINT32(selector, CPUHotplugState),
 318         VMSTATE_UINT8(command, CPUHotplugState),
 319         VMSTATE_STRUCT_VARRAY_POINTER_UINT32(devs, CPUHotplugState, dev_count,
 320                                              vmstate_cpuhp_sts, AcpiCpuStatus),
 321         VMSTATE_END_OF_LIST()
 322     }
 323 };
 324
 325 #define CPU_NAME_FMT      "C%.03X"
 326 #define CPUHP_RES_DEVICE  "PRES"
 327 #define CPU_LOCK          "CPLK"
 328 #define CPU_STS_METHOD    "CSTA"
 329 #define CPU_SCAN_METHOD   "CSCN"
 330 #define CPU_NOTIFY_METHOD "CTFY"
 331 #define CPU_EJECT_METHOD  "CEJ0"
 332 #define CPU_OST_METHOD    "COST"
 333 #define CPU_ADDED_LIST    "CNEW"
 334
 335 #define CPU_ENABLED       "CPEN"
 336 #define CPU_SELECTOR      "CSEL"
 337 #define CPU_COMMAND       "CCMD"
 338 #define CPU_DATA          "CDAT"
 339 #define CPU_INSERT_EVENT  "CINS"
 340 #define CPU_REMOVE_EVENT  "CRMV"
 341 #define CPU_EJECT_EVENT   "CEJ0"
 342 #define CPU_FW_EJECT_EVENT "CEJF"
 343
 344 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
 345                     hwaddr io_base,
 346                     const char *res_root,
 347                     const char *event_handler_method)
 348 {
 349     Aml *ifctx;
 350     Aml *field;
 351     Aml *method;
 352     Aml *cpu_ctrl_dev;
 353     Aml *cpus_dev;
 354     Aml *zero = aml_int(0);
 355     Aml *one = aml_int(1);
 356     Aml *sb_scope = aml_scope("_SB");
 357     MachineClass *mc = MACHINE_GET_CLASS(machine);
 358     const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(machine);
 359     char *cphp_res_path = g_strdup_printf("%s." CPUHP_RES_DEVICE, res_root);
 360     Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, NULL);
 361     AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
 362     AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
 363
 364     cpu_ctrl_dev = aml_device("%s", cphp_res_path);
 365     {
 366         Aml *crs;
 367
 368         aml_append(cpu_ctrl_dev,
 369             aml_name_decl("_HID", aml_eisaid("PNP0A06")));
 370         aml_append(cpu_ctrl_dev,
 371             aml_name_decl("_UID", aml_string("CPU Hotplug resources")));
 372         aml_append(cpu_ctrl_dev, aml_mutex(CPU_LOCK, 0));
 373
 374         crs = aml_resource_template();
 375         aml_append(crs, aml_io(AML_DECODE16, io_base, io_base, 1,
 376                                ACPI_CPU_HOTPLUG_REG_LEN));
 377         aml_append(cpu_ctrl_dev, aml_name_decl("_CRS", crs));
 378
 379         /* declare CPU hotplug MMIO region with related access fields */
 380         aml_append(cpu_ctrl_dev,
 381             aml_operation_region("PRST", AML_SYSTEM_IO, aml_int(io_base),
 382                                  ACPI_CPU_HOTPLUG_REG_LEN));
 383
 384         field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK,
 385                           AML_WRITE_AS_ZEROS);
 386         aml_append(field, aml_reserved_field(ACPI_CPU_FLAGS_OFFSET_RW * 8));
 387         /* 1 if enabled, read only */
 388         aml_append(field, aml_named_field(CPU_ENABLED, 1));
 389         /* (read) 1 if has a insert event. (write) 1 to clear event */
 390         aml_append(field, aml_named_field(CPU_INSERT_EVENT, 1));
 391         /* (read) 1 if has a remove event. (write) 1 to clear event */
 392         aml_append(field, aml_named_field(CPU_REMOVE_EVENT, 1));
 393         /* initiates device eject, write only */
 394         aml_append(field, aml_named_field(CPU_EJECT_EVENT, 1));
 395         /* tell firmware to do device eject, write only */
 396         aml_append(field, aml_named_field(CPU_FW_EJECT_EVENT, 1));
 397         aml_append(field, aml_reserved_field(3));
 398         aml_append(field, aml_named_field(CPU_COMMAND, 8));
 399         aml_append(cpu_ctrl_dev, field);
 400
 401         field = aml_field("PRST", AML_DWORD_ACC, AML_NOLOCK, AML_PRESERVE);
 402         /* CPU selector, write only */
 403         aml_append(field, aml_named_field(CPU_SELECTOR, 32));
 404         /* flags + cmd + 2byte align */
 405         aml_append(field, aml_reserved_field(4 * 8));
 406         aml_append(field, aml_named_field(CPU_DATA, 32));
 407         aml_append(cpu_ctrl_dev, field);
 408
 409         if (opts.has_legacy_cphp) {
 410             method = aml_method("_INI", 0, AML_SERIALIZED);
 411             /* switch off legacy CPU hotplug HW and use new one,
 412              * on reboot system is in new mode and writing 0
 413              * in CPU_SELECTOR selects BSP, which is NOP at
 414              * the time _INI is called */
 415             aml_append(method, aml_store(zero, aml_name(CPU_SELECTOR)));
 416             aml_append(cpu_ctrl_dev, method);
 417         }
 418     }
 419     aml_append(sb_scope, cpu_ctrl_dev);
 420
 421     cpus_dev = aml_device("\\_SB.CPUS");
 422     {
 423         int i;
 424         Aml *ctrl_lock = aml_name("%s.%s", cphp_res_path, CPU_LOCK);
 425         Aml *cpu_selector = aml_name("%s.%s", cphp_res_path, CPU_SELECTOR);
 426         Aml *is_enabled = aml_name("%s.%s", cphp_res_path, CPU_ENABLED);
 427         Aml *cpu_cmd = aml_name("%s.%s", cphp_res_path, CPU_COMMAND);
 428         Aml *cpu_data = aml_name("%s.%s", cphp_res_path, CPU_DATA);
 429         Aml *ins_evt = aml_name("%s.%s", cphp_res_path, CPU_INSERT_EVENT);
 430         Aml *rm_evt = aml_name("%s.%s", cphp_res_path, CPU_REMOVE_EVENT);
 431         Aml *ej_evt = aml_name("%s.%s", cphp_res_path, CPU_EJECT_EVENT);
 432         Aml *fw_ej_evt = aml_name("%s.%s", cphp_res_path, CPU_FW_EJECT_EVENT);
 433
 434         aml_append(cpus_dev, aml_name_decl("_HID", aml_string("ACPI0010")));
 435         aml_append(cpus_dev, aml_name_decl("_CID", aml_eisaid("PNP0A05")));
 436
 437         method = aml_method(CPU_NOTIFY_METHOD, 2, AML_NOTSERIALIZED);
 438         for (i = 0; i < arch_ids->len; i++) {
 439             Aml *cpu = aml_name(CPU_NAME_FMT, i);
 440             Aml *uid = aml_arg(0);
 441             Aml *event = aml_arg(1);
 442
 443             ifctx = aml_if(aml_equal(uid, aml_int(i)));
 444             {
 445                 aml_append(ifctx, aml_notify(cpu, event));
 446             }
 447             aml_append(method, ifctx);
 448         }
 449         aml_append(cpus_dev, method);
 450
 451         method = aml_method(CPU_STS_METHOD, 1, AML_SERIALIZED);
 452         {
 453             Aml *idx = aml_arg(0);
 454             Aml *sta = aml_local(0);
 455
 456             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 457             aml_append(method, aml_store(idx, cpu_selector));
 458             aml_append(method, aml_store(zero, sta));
 459             ifctx = aml_if(aml_equal(is_enabled, one));
 460             {
 461                 aml_append(ifctx, aml_store(aml_int(0xF), sta));
 462             }
 463             aml_append(method, ifctx);
 464             aml_append(method, aml_release(ctrl_lock));
 465             aml_append(method, aml_return(sta));
 466         }
 467         aml_append(cpus_dev, method);
 468
 469         method = aml_method(CPU_EJECT_METHOD, 1, AML_SERIALIZED);
 470         {
 471             Aml *idx = aml_arg(0);
 472
 473             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 474             aml_append(method, aml_store(idx, cpu_selector));
 475             if (opts.fw_unplugs_cpu) {
 476                 aml_append(method, aml_store(one, fw_ej_evt));
 477                 aml_append(method, aml_store(aml_int(OVMF_CPUHP_SMI_CMD),
 478                            aml_name("%s", opts.smi_path)));
 479             } else {
 480                 aml_append(method, aml_store(one, ej_evt));
 481             }
 482             aml_append(method, aml_release(ctrl_lock));
 483         }
 484         aml_append(cpus_dev, method);
 485
 486         method = aml_method(CPU_SCAN_METHOD, 0, AML_SERIALIZED);
 487         {
 488             const uint8_t max_cpus_per_pass = 255;
 489             Aml *else_ctx;
 490             Aml *while_ctx, *while_ctx2;
 491             Aml *has_event = aml_local(0);
 492             Aml *dev_chk = aml_int(1);
 493             Aml *eject_req = aml_int(3);
 494             Aml *next_cpu_cmd = aml_int(CPHP_GET_NEXT_CPU_WITH_EVENT_CMD);
 495             Aml *num_added_cpus = aml_local(1);
 496             Aml *cpu_idx = aml_local(2);
 497             Aml *uid = aml_local(3);
 498             Aml *has_job = aml_local(4);
 499             Aml *new_cpus = aml_name(CPU_ADDED_LIST);
 500
 501             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 502
 503             /*
 504              * Windows versions newer than XP (including Windows 10/Windows
 505              * Server 2019), do support* VarPackageOp but, it is cripled to hold
 506              * the same elements number as old PackageOp.
 507              * For compatibility with Windows XP (so it won't crash) use ACPI1.0
 508              * PackageOp which can hold max 255 elements.
 509              *
 510              * use named package as old Windows don't support it in local var
 511              */
 512             aml_append(method, aml_name_decl(CPU_ADDED_LIST,
 513                                              aml_package(max_cpus_per_pass)));
 514
 515             aml_append(method, aml_store(zero, uid));
 516             aml_append(method, aml_store(one, has_job));
 517             /*
 518              * CPU_ADDED_LIST can hold limited number of elements, outer loop
 519              * allows to process CPUs in batches which let us to handle more
 520              * CPUs than CPU_ADDED_LIST can hold.
 521              */
 522             while_ctx2 = aml_while(aml_equal(has_job, one));
 523             {
 524                 aml_append(while_ctx2, aml_store(zero, has_job));
 525
 526                 aml_append(while_ctx2, aml_store(one, has_event));
 527                 aml_append(while_ctx2, aml_store(zero, num_added_cpus));
 528
 529                 /*
 530                  * Scan CPUs, till there are CPUs with events or
 531                  * CPU_ADDED_LIST capacity is exhausted
 532                  */
 533                 while_ctx = aml_while(aml_land(aml_equal(has_event, one),
 534                                       aml_lless(uid, aml_int(arch_ids->len))));
 535                 {
 536                      /*
 537                       * clear loop exit condition, ins_evt/rm_evt checks will
 538                       * set it to 1 while next_cpu_cmd returns a CPU with events
 539                       */
 540                      aml_append(while_ctx, aml_store(zero, has_event));
 541
 542                      aml_append(while_ctx, aml_store(uid, cpu_selector));
 543                      aml_append(while_ctx, aml_store(next_cpu_cmd, cpu_cmd));
 544
 545                      /*
 546                       * wrap around case, scan is complete, exit loop.
 547                       * It happens since events are not cleared in scan loop,
 548                       * so next_cpu_cmd continues to find already processed CPUs
 549                       */
 550                      ifctx = aml_if(aml_lless(cpu_data, uid));
 551                      {
 552                          aml_append(ifctx, aml_break());
 553                      }
 554                      aml_append(while_ctx, ifctx);
 555
 556                      /*
 557                       * if CPU_ADDED_LIST is full, exit inner loop and process
 558                       * collected CPUs
 559                       */
 560                      ifctx = aml_if(
 561                          aml_equal(num_added_cpus, aml_int(max_cpus_per_pass)));
 562                      {
 563                          aml_append(ifctx, aml_store(one, has_job));
 564                          aml_append(ifctx, aml_break());
 565                      }
 566                      aml_append(while_ctx, ifctx);
 567
 568                      aml_append(while_ctx, aml_store(cpu_data, uid));
 569                      ifctx = aml_if(aml_equal(ins_evt, one));
 570                      {
 571                          /* cache added CPUs to Notify/Wakeup later */
 572                          aml_append(ifctx, aml_store(uid,
 573                              aml_index(new_cpus, num_added_cpus)));
 574                          aml_append(ifctx, aml_increment(num_added_cpus));
 575                          aml_append(ifctx, aml_store(one, has_event));
 576                      }
 577                      aml_append(while_ctx, ifctx);
 578                      else_ctx = aml_else();
 579                      ifctx = aml_if(aml_equal(rm_evt, one));
 580                      {
 581                          aml_append(ifctx,
 582                              aml_call2(CPU_NOTIFY_METHOD, uid, eject_req));
 583                          aml_append(ifctx, aml_store(one, rm_evt));
 584                          aml_append(ifctx, aml_store(one, has_event));
 585                      }
 586                      aml_append(else_ctx, ifctx);
 587                      aml_append(while_ctx, else_ctx);
 588                      aml_append(while_ctx, aml_increment(uid));
 589                 }
 590                 aml_append(while_ctx2, while_ctx);
 591
 592                 /*
 593                  * in case FW negotiated ICH9_LPC_SMI_F_CPU_HOTPLUG_BIT,
 594                  * make upcall to FW, so it can pull in new CPUs before
 595                  * OS is notified and wakes them up
 596                  */
 597                 if (opts.smi_path) {
 598                     ifctx = aml_if(aml_lgreater(num_added_cpus, zero));
 599                     {
 600                         aml_append(ifctx, aml_store(aml_int(OVMF_CPUHP_SMI_CMD),
 601                             aml_name("%s", opts.smi_path)));
 602                     }
 603                     aml_append(while_ctx2, ifctx);
 604                 }
 605
 606                 /* Notify OSPM about new CPUs and clear insert events */
 607                 aml_append(while_ctx2, aml_store(zero, cpu_idx));
 608                 while_ctx = aml_while(aml_lless(cpu_idx, num_added_cpus));
 609                 {
 610                     aml_append(while_ctx,
 611                         aml_store(aml_derefof(aml_index(new_cpus, cpu_idx)),
 612                                   uid));
 613                     aml_append(while_ctx,
 614                         aml_call2(CPU_NOTIFY_METHOD, uid, dev_chk));
 615                     aml_append(while_ctx, aml_store(uid, aml_debug()));
 616                     aml_append(while_ctx, aml_store(uid, cpu_selector));
 617                     aml_append(while_ctx, aml_store(one, ins_evt));
 618                     aml_append(while_ctx, aml_increment(cpu_idx));
 619                 }
 620                 aml_append(while_ctx2, while_ctx);
 621                 /*
 622                  * If another batch is needed, then it will resume scanning
 623                  * exactly at -- and not after -- the last CPU that's currently
 624                  * in CPU_ADDED_LIST. In other words, the last CPU in
 625                  * CPU_ADDED_LIST is going to be re-checked. That's OK: we've
 626                  * just cleared the insert event for *all* CPUs in
 627                  * CPU_ADDED_LIST, including the last one. So the scan will
 628                  * simply seek past it.
 629                  */
 630             }
 631             aml_append(method, while_ctx2);
 632             aml_append(method, aml_release(ctrl_lock));
 633         }
 634         aml_append(cpus_dev, method);
 635
 636         method = aml_method(CPU_OST_METHOD, 4, AML_SERIALIZED);
 637         {
 638             Aml *uid = aml_arg(0);
 639             Aml *ev_cmd = aml_int(CPHP_OST_EVENT_CMD);
 640             Aml *st_cmd = aml_int(CPHP_OST_STATUS_CMD);
 641
 642             aml_append(method, aml_acquire(ctrl_lock, 0xFFFF));
 643             aml_append(method, aml_store(uid, cpu_selector));
 644             aml_append(method, aml_store(ev_cmd, cpu_cmd));
 645             aml_append(method, aml_store(aml_arg(1), cpu_data));
 646             aml_append(method, aml_store(st_cmd, cpu_cmd));
 647             aml_append(method, aml_store(aml_arg(2), cpu_data));
 648             aml_append(method, aml_release(ctrl_lock));
 649         }
 650         aml_append(cpus_dev, method);
 651
 652         /* build Processor object for each processor */
 653         for (i = 0; i < arch_ids->len; i++) {
 654             Aml *dev;
 655             Aml *uid = aml_int(i);
 656             GArray *madt_buf = g_array_new(0, 1, 1);
 657             int arch_id = arch_ids->cpus[i].arch_id;
 658
 659             if (opts.acpi_1_compatible && arch_id < 255) {
 660                 dev = aml_processor(i, 0, 0, CPU_NAME_FMT, i);
 661             } else {
 662                 dev = aml_device(CPU_NAME_FMT, i);
 663                 aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
 664                 aml_append(dev, aml_name_decl("_UID", uid));
 665             }
 666
 667             method = aml_method("_STA", 0, AML_SERIALIZED);
 668             aml_append(method, aml_return(aml_call1(CPU_STS_METHOD, uid)));
 669             aml_append(dev, method);
 670
 671             /* build _MAT object */
 672             assert(adevc && adevc->madt_cpu);
 673             adevc->madt_cpu(adev, i, arch_ids, madt_buf);
 674             switch (madt_buf->data[0]) {
 675             case ACPI_APIC_PROCESSOR: {
 676                 AcpiMadtProcessorApic *apic = (void *)madt_buf->data;
 677                 apic->flags = cpu_to_le32(1);
 678                 break;
 679             }
 680             case ACPI_APIC_LOCAL_X2APIC: {
 681                 AcpiMadtProcessorX2Apic *apic = (void *)madt_buf->data;
 682                 apic->flags = cpu_to_le32(1);
 683                 break;
 684             }
 685             default:
 686                 assert(0);
 687             }
 688             aml_append(dev, aml_name_decl("_MAT",
 689                 aml_buffer(madt_buf->len, (uint8_t *)madt_buf->data)));
 690             g_array_free(madt_buf, true);
 691
 692             if (CPU(arch_ids->cpus[i].cpu) != first_cpu) {
 693                 method = aml_method("_EJ0", 1, AML_NOTSERIALIZED);
 694                 aml_append(method, aml_call1(CPU_EJECT_METHOD, uid));
 695                 aml_append(dev, method);
 696             }
 697
 698             method = aml_method("_OST", 3, AML_SERIALIZED);
 699             aml_append(method,
 700                 aml_call4(CPU_OST_METHOD, uid, aml_arg(0),
 701                           aml_arg(1), aml_arg(2))
 702             );
 703             aml_append(dev, method);
 704
 705             /* Linux guests discard SRAT info for non-present CPUs
 706              * as a result _PXM is required for all CPUs which might
 707              * be hot-plugged. For simplicity, add it for all CPUs.
 708              */
 709             if (arch_ids->cpus[i].props.has_node_id) {
 710                 aml_append(dev, aml_name_decl("_PXM",
 711                            aml_int(arch_ids->cpus[i].props.node_id)));
 712             }
 713
 714             aml_append(cpus_dev, dev);
 715         }
 716     }
 717     aml_append(sb_scope, cpus_dev);
 718     aml_append(table, sb_scope);
 719
 720     method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
 721     aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
 722     aml_append(table, method);
 723
 724     g_free(cphp_res_path);
 725 }