hw/s390x/sclp.c

   1 /*
   2  * SCLP Support
   3  *
   4  * Copyright IBM, Corp. 2012
   5  *
   6  * Authors:
   7  *  Christian Borntraeger <borntraeger@de.ibm.com>
   8  *  Heinz Graalfs <graalfs@linux.vnet.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or (at your
  11  * option) any later version.  See the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 #include "qemu/osdep.h"
  16 #include "qapi/error.h"
  17 #include "cpu.h"
  18 #include "sysemu/kvm.h"
  19 #include "exec/memory.h"
  20 #include "sysemu/sysemu.h"
  21 #include "exec/address-spaces.h"
  22 #include "hw/boards.h"
  23 #include "hw/s390x/sclp.h"
  24 #include "hw/s390x/event-facility.h"
  25 #include "hw/s390x/s390-pci-bus.h"
  26 #include "hw/s390x/ipl.h"
  27
  28 static inline SCLPDevice *get_sclp_device(void)
  29 {
  30     static SCLPDevice *sclp;
  31
  32     if (!sclp) {
  33         sclp = SCLP(object_resolve_path_type("", TYPE_SCLP, NULL));
  34     }
  35     return sclp;
  36 }
  37
  38 static void prepare_cpu_entries(SCLPDevice *sclp, CPUEntry *entry, int count)
  39 {
  40     uint8_t features[SCCB_CPU_FEATURE_LEN] = { 0 };
  41     int i;
  42
  43     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CPU, features);
  44     for (i = 0; i < count; i++) {
  45         entry[i].address = i;
  46         entry[i].type = 0;
  47         memcpy(entry[i].features, features, sizeof(entry[i].features));
  48     }
  49 }
  50
  51 /* Provide information about the configuration, CPUs and storage */
  52 static void read_SCP_info(SCLPDevice *sclp, SCCB *sccb)
  53 {
  54     ReadInfo *read_info = (ReadInfo *) sccb;
  55     MachineState *machine = MACHINE(qdev_get_machine());
  56     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
  57     CPUState *cpu;
  58     int cpu_count = 0;
  59     int rnsize, rnmax;
  60     int slots = MIN(machine->ram_slots, s390_get_memslot_count(kvm_state));
  61     IplParameterBlock *ipib = s390_ipl_get_iplb();
  62
  63     CPU_FOREACH(cpu) {
  64         cpu_count++;
  65     }
  66
  67     /* CPU information */
  68     read_info->entries_cpu = cpu_to_be16(cpu_count);
  69     read_info->offset_cpu = cpu_to_be16(offsetof(ReadInfo, entries));
  70     read_info->highest_cpu = cpu_to_be16(max_cpus);
  71
  72     read_info->ibc_val = cpu_to_be32(s390_get_ibc_val());
  73
  74     /* Configuration Characteristic (Extension) */
  75     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR,
  76                          read_info->conf_char);
  77     s390_get_feat_block(S390_FEAT_TYPE_SCLP_CONF_CHAR_EXT,
  78                          read_info->conf_char_ext);
  79
  80     prepare_cpu_entries(sclp, read_info->entries, cpu_count);
  81
  82     read_info->facilities = cpu_to_be64(SCLP_HAS_CPU_INFO |
  83                                         SCLP_HAS_IOA_RECONFIG);
  84
  85     /* Memory Hotplug is only supported for the ccw machine type */
  86     if (mhd) {
  87         mhd->standby_subregion_size = MEM_SECTION_SIZE;
  88         /* Deduct the memory slot already used for core */
  89         if (slots > 0) {
  90             while ((mhd->standby_subregion_size * (slots - 1)
  91                     < mhd->standby_mem_size)) {
  92                 mhd->standby_subregion_size = mhd->standby_subregion_size << 1;
  93             }
  94         }
  95         /*
  96          * Initialize mapping of guest standby memory sections indicating which
  97          * are and are not online. Assume all standby memory begins offline.
  98          */
  99         if (mhd->standby_state_map == 0) {
 100             if (mhd->standby_mem_size % mhd->standby_subregion_size) {
 101                 mhd->standby_state_map = g_malloc0((mhd->standby_mem_size /
 102                                              mhd->standby_subregion_size + 1) *
 103                                              (mhd->standby_subregion_size /
 104                                              MEM_SECTION_SIZE));
 105             } else {
 106                 mhd->standby_state_map = g_malloc0(mhd->standby_mem_size /
 107                                                    MEM_SECTION_SIZE);
 108             }
 109         }
 110         mhd->padded_ram_size = ram_size + mhd->pad_size;
 111         mhd->rzm = 1 << mhd->increment_size;
 112
 113         read_info->facilities |= cpu_to_be64(SCLP_FC_ASSIGN_ATTACH_READ_STOR);
 114     }
 115     read_info->mha_pow = s390_get_mha_pow();
 116     read_info->hmfai = cpu_to_be32(s390_get_hmfai());
 117
 118     rnsize = 1 << (sclp->increment_size - 20);
 119     if (rnsize <= 128) {
 120         read_info->rnsize = rnsize;
 121     } else {
 122         read_info->rnsize = 0;
 123         read_info->rnsize2 = cpu_to_be32(rnsize);
 124     }
 125
 126     rnmax = machine->maxram_size >> sclp->increment_size;
 127     if (rnmax < 0x10000) {
 128         read_info->rnmax = cpu_to_be16(rnmax);
 129     } else {
 130         read_info->rnmax = cpu_to_be16(0);
 131         read_info->rnmax2 = cpu_to_be64(rnmax);
 132     }
 133
 134     if (ipib && ipib->flags & DIAG308_FLAGS_LP_VALID) {
 135         memcpy(&read_info->loadparm, &ipib->loadparm,
 136                sizeof(read_info->loadparm));
 137     } else {
 138         s390_ipl_set_loadparm(read_info->loadparm);
 139     }
 140
 141     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 142 }
 143
 144 static void read_storage_element0_info(SCLPDevice *sclp, SCCB *sccb)
 145 {
 146     int i, assigned;
 147     int subincrement_id = SCLP_STARTING_SUBINCREMENT_ID;
 148     ReadStorageElementInfo *storage_info = (ReadStorageElementInfo *) sccb;
 149     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 150
 151     if (!mhd) {
 152         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 153         return;
 154     }
 155
 156     if ((ram_size >> mhd->increment_size) >= 0x10000) {
 157         sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
 158         return;
 159     }
 160
 161     /* Return information regarding core memory */
 162     storage_info->max_id = cpu_to_be16(mhd->standby_mem_size ? 1 : 0);
 163     assigned = ram_size >> mhd->increment_size;
 164     storage_info->assigned = cpu_to_be16(assigned);
 165
 166     for (i = 0; i < assigned; i++) {
 167         storage_info->entries[i] = cpu_to_be32(subincrement_id);
 168         subincrement_id += SCLP_INCREMENT_UNIT;
 169     }
 170     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 171 }
 172
 173 static void read_storage_element1_info(SCLPDevice *sclp, SCCB *sccb)
 174 {
 175     ReadStorageElementInfo *storage_info = (ReadStorageElementInfo *) sccb;
 176     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 177
 178     if (!mhd) {
 179         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 180         return;
 181     }
 182
 183     if ((mhd->standby_mem_size >> mhd->increment_size) >= 0x10000) {
 184         sccb->h.response_code = cpu_to_be16(SCLP_RC_SCCB_BOUNDARY_VIOLATION);
 185         return;
 186     }
 187
 188     /* Return information regarding standby memory */
 189     storage_info->max_id = cpu_to_be16(mhd->standby_mem_size ? 1 : 0);
 190     storage_info->assigned = cpu_to_be16(mhd->standby_mem_size >>
 191                                          mhd->increment_size);
 192     storage_info->standby = cpu_to_be16(mhd->standby_mem_size >>
 193                                         mhd->increment_size);
 194     sccb->h.response_code = cpu_to_be16(SCLP_RC_STANDBY_READ_COMPLETION);
 195 }
 196
 197 static void attach_storage_element(SCLPDevice *sclp, SCCB *sccb,
 198                                    uint16_t element)
 199 {
 200     int i, assigned, subincrement_id;
 201     AttachStorageElement *attach_info = (AttachStorageElement *) sccb;
 202     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 203
 204     if (!mhd) {
 205         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 206         return;
 207     }
 208
 209     if (element != 1) {
 210         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 211         return;
 212     }
 213
 214     assigned = mhd->standby_mem_size >> mhd->increment_size;
 215     attach_info->assigned = cpu_to_be16(assigned);
 216     subincrement_id = ((ram_size >> mhd->increment_size) << 16)
 217                       + SCLP_STARTING_SUBINCREMENT_ID;
 218     for (i = 0; i < assigned; i++) {
 219         attach_info->entries[i] = cpu_to_be32(subincrement_id);
 220         subincrement_id += SCLP_INCREMENT_UNIT;
 221     }
 222     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
 223 }
 224
 225 static void assign_storage(SCLPDevice *sclp, SCCB *sccb)
 226 {
 227     MemoryRegion *mr = NULL;
 228     uint64_t this_subregion_size;
 229     AssignStorage *assign_info = (AssignStorage *) sccb;
 230     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 231     ram_addr_t assign_addr;
 232     MemoryRegion *sysmem = get_system_memory();
 233
 234     if (!mhd) {
 235         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 236         return;
 237     }
 238     assign_addr = (assign_info->rn - 1) * mhd->rzm;
 239
 240     if ((assign_addr % MEM_SECTION_SIZE == 0) &&
 241         (assign_addr >= mhd->padded_ram_size)) {
 242         /* Re-use existing memory region if found */
 243         mr = memory_region_find(sysmem, assign_addr, 1).mr;
 244         memory_region_unref(mr);
 245         if (!mr) {
 246
 247             MemoryRegion *standby_ram = g_new(MemoryRegion, 1);
 248
 249             /* offset to align to standby_subregion_size for allocation */
 250             ram_addr_t offset = assign_addr -
 251                                 (assign_addr - mhd->padded_ram_size)
 252                                 % mhd->standby_subregion_size;
 253
 254             /* strlen("standby.ram") + 4 (Max of KVM_MEMORY_SLOTS) +  NULL */
 255             char id[16];
 256             snprintf(id, 16, "standby.ram%d",
 257                      (int)((offset - mhd->padded_ram_size) /
 258                      mhd->standby_subregion_size) + 1);
 259
 260             /* Allocate a subregion of the calculated standby_subregion_size */
 261             if (offset + mhd->standby_subregion_size >
 262                 mhd->padded_ram_size + mhd->standby_mem_size) {
 263                 this_subregion_size = mhd->padded_ram_size +
 264                   mhd->standby_mem_size - offset;
 265             } else {
 266                 this_subregion_size = mhd->standby_subregion_size;
 267             }
 268
 269             memory_region_init_ram(standby_ram, NULL, id, this_subregion_size,
 270                                    &error_fatal);
 271             /* This is a hack to make memory hotunplug work again. Once we have
 272              * subdevices, we have to unparent them when unassigning memory,
 273              * instead of doing it via the ref count of the MemoryRegion. */
 274             object_ref(OBJECT(standby_ram));
 275             object_unparent(OBJECT(standby_ram));
 276             memory_region_add_subregion(sysmem, offset, standby_ram);
 277         }
 278         /* The specified subregion is no longer in standby */
 279         mhd->standby_state_map[(assign_addr - mhd->padded_ram_size)
 280                                / MEM_SECTION_SIZE] = 1;
 281     }
 282     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
 283 }
 284
 285 static void unassign_storage(SCLPDevice *sclp, SCCB *sccb)
 286 {
 287     MemoryRegion *mr = NULL;
 288     AssignStorage *assign_info = (AssignStorage *) sccb;
 289     sclpMemoryHotplugDev *mhd = get_sclp_memory_hotplug_dev();
 290     ram_addr_t unassign_addr;
 291     MemoryRegion *sysmem = get_system_memory();
 292
 293     if (!mhd) {
 294         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
 295         return;
 296     }
 297     unassign_addr = (assign_info->rn - 1) * mhd->rzm;
 298
 299     /* if the addr is a multiple of 256 MB */
 300     if ((unassign_addr % MEM_SECTION_SIZE == 0) &&
 301         (unassign_addr >= mhd->padded_ram_size)) {
 302         mhd->standby_state_map[(unassign_addr -
 303                            mhd->padded_ram_size) / MEM_SECTION_SIZE] = 0;
 304
 305         /* find the specified memory region and destroy it */
 306         mr = memory_region_find(sysmem, unassign_addr, 1).mr;
 307         memory_region_unref(mr);
 308         if (mr) {
 309             int i;
 310             int is_removable = 1;
 311             ram_addr_t map_offset = (unassign_addr - mhd->padded_ram_size -
 312                                      (unassign_addr - mhd->padded_ram_size)
 313                                      % mhd->standby_subregion_size);
 314             /* Mark all affected subregions as 'standby' once again */
 315             for (i = 0;
 316                  i < (mhd->standby_subregion_size / MEM_SECTION_SIZE);
 317                  i++) {
 318
 319                 if (mhd->standby_state_map[i + map_offset / MEM_SECTION_SIZE]) {
 320                     is_removable = 0;
 321                     break;
 322                 }
 323             }
 324             if (is_removable) {
 325                 memory_region_del_subregion(sysmem, mr);
 326                 object_unref(OBJECT(mr));
 327             }
 328         }
 329     }
 330     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);
 331 }
 332
 333 /* Provide information about the CPU */
 334 static void sclp_read_cpu_info(SCLPDevice *sclp, SCCB *sccb)
 335 {
 336     ReadCpuInfo *cpu_info = (ReadCpuInfo *) sccb;
 337     CPUState *cpu;
 338     int cpu_count = 0;
 339
 340     CPU_FOREACH(cpu) {
 341         cpu_count++;
 342     }
 343
 344     cpu_info->nr_configured = cpu_to_be16(cpu_count);
 345     cpu_info->offset_configured = cpu_to_be16(offsetof(ReadCpuInfo, entries));
 346     cpu_info->nr_standby = cpu_to_be16(0);
 347
 348     /* The standby offset is 16-byte for each CPU */
 349     cpu_info->offset_standby = cpu_to_be16(cpu_info->offset_configured
 350         + cpu_info->nr_configured*sizeof(CPUEntry));
 351
 352     prepare_cpu_entries(sclp, cpu_info->entries, cpu_count);
 353
 354     sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_READ_COMPLETION);
 355 }
 356
 357 static void sclp_configure_io_adapter(SCLPDevice *sclp, SCCB *sccb,
 358                                       bool configure)
 359 {
 360     int rc;
 361
 362     if (be16_to_cpu(sccb->h.length) < 16) {
 363         rc = SCLP_RC_INSUFFICIENT_SCCB_LENGTH;
 364         goto out_err;
 365     }
 366
 367     switch (((IoaCfgSccb *)sccb)->atype) {
 368     case SCLP_RECONFIG_PCI_ATYPE:
 369         if (s390_has_feat(S390_FEAT_ZPCI)) {
 370             if (configure) {
 371                 s390_pci_sclp_configure(sccb);
 372             } else {
 373                 s390_pci_sclp_deconfigure(sccb);
 374             }
 375             return;
 376         }
 377         /* fallthrough */
 378     default:
 379         rc = SCLP_RC_ADAPTER_TYPE_NOT_RECOGNIZED;
 380     }
 381
 382  out_err:
 383     sccb->h.response_code = cpu_to_be16(rc);
 384 }
 385
 386 static void sclp_execute(SCLPDevice *sclp, SCCB *sccb, uint32_t code)
 387 {
 388     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 389     SCLPEventFacility *ef = sclp->event_facility;
 390     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 391
 392     switch (code & SCLP_CMD_CODE_MASK) {
 393     case SCLP_CMDW_READ_SCP_INFO:
 394     case SCLP_CMDW_READ_SCP_INFO_FORCED:
 395         sclp_c->read_SCP_info(sclp, sccb);
 396         break;
 397     case SCLP_CMDW_READ_CPU_INFO:
 398         sclp_c->read_cpu_info(sclp, sccb);
 399         break;
 400     case SCLP_READ_STORAGE_ELEMENT_INFO:
 401         if (code & 0xff00) {
 402             sclp_c->read_storage_element1_info(sclp, sccb);
 403         } else {
 404             sclp_c->read_storage_element0_info(sclp, sccb);
 405         }
 406         break;
 407     case SCLP_ATTACH_STORAGE_ELEMENT:
 408         sclp_c->attach_storage_element(sclp, sccb, (code & 0xff00) >> 8);
 409         break;
 410     case SCLP_ASSIGN_STORAGE:
 411         sclp_c->assign_storage(sclp, sccb);
 412         break;
 413     case SCLP_UNASSIGN_STORAGE:
 414         sclp_c->unassign_storage(sclp, sccb);
 415         break;
 416     case SCLP_CMDW_CONFIGURE_IOA:
 417         sclp_configure_io_adapter(sclp, sccb, true);
 418         break;
 419     case SCLP_CMDW_DECONFIGURE_IOA:
 420         sclp_configure_io_adapter(sclp, sccb, false);
 421         break;
 422     default:
 423         efc->command_handler(ef, sccb, code);
 424         break;
 425     }
 426 }
 427
 428 int sclp_service_call(CPUS390XState *env, uint64_t sccb, uint32_t code)
 429 {
 430     SCLPDevice *sclp = get_sclp_device();
 431     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 432     int r = 0;
 433     SCCB work_sccb;
 434
 435     hwaddr sccb_len = sizeof(SCCB);
 436
 437     /* first some basic checks on program checks */
 438     if (env->psw.mask & PSW_MASK_PSTATE) {
 439         r = -PGM_PRIVILEGED;
 440         goto out;
 441     }
 442     if (cpu_physical_memory_is_io(sccb)) {
 443         r = -PGM_ADDRESSING;
 444         goto out;
 445     }
 446     if ((sccb & ~0x1fffUL) == 0 || (sccb & ~0x1fffUL) == env->psa
 447         || (sccb & ~0x7ffffff8UL) != 0) {
 448         r = -PGM_SPECIFICATION;
 449         goto out;
 450     }
 451
 452     /*
 453      * we want to work on a private copy of the sccb, to prevent guests
 454      * from playing dirty tricks by modifying the memory content after
 455      * the host has checked the values
 456      */
 457     cpu_physical_memory_read(sccb, &work_sccb, sccb_len);
 458
 459     /* Valid sccb sizes */
 460     if (be16_to_cpu(work_sccb.h.length) < sizeof(SCCBHeader) ||
 461         be16_to_cpu(work_sccb.h.length) > SCCB_SIZE) {
 462         r = -PGM_SPECIFICATION;
 463         goto out;
 464     }
 465
 466     sclp_c->execute(sclp, &work_sccb, code);
 467
 468     cpu_physical_memory_write(sccb, &work_sccb,
 469                               be16_to_cpu(work_sccb.h.length));
 470
 471     sclp_c->service_interrupt(sclp, sccb);
 472
 473 out:
 474     return r;
 475 }
 476
 477 static void service_interrupt(SCLPDevice *sclp, uint32_t sccb)
 478 {
 479     SCLPEventFacility *ef = sclp->event_facility;
 480     SCLPEventFacilityClass *efc = EVENT_FACILITY_GET_CLASS(ef);
 481
 482     uint32_t param = sccb & ~3;
 483
 484     /* Indicate whether an event is still pending */
 485     param |= efc->event_pending(ef) ? 1 : 0;
 486
 487     if (!param) {
 488         /* No need to send an interrupt, there's nothing to be notified about */
 489         return;
 490     }
 491     s390_sclp_extint(param);
 492 }
 493
 494 void sclp_service_interrupt(uint32_t sccb)
 495 {
 496     SCLPDevice *sclp = get_sclp_device();
 497     SCLPDeviceClass *sclp_c = SCLP_GET_CLASS(sclp);
 498
 499     sclp_c->service_interrupt(sclp, sccb);
 500 }
 501
 502 /* qemu object creation and initialization functions */
 503
 504 void s390_sclp_init(void)
 505 {
 506     Object *new = object_new(TYPE_SCLP);
 507
 508     object_property_add_child(qdev_get_machine(), TYPE_SCLP, new,
 509                               NULL);
 510     object_unref(OBJECT(new));
 511     qdev_init_nofail(DEVICE(new));
 512 }
 513
 514 static void sclp_realize(DeviceState *dev, Error **errp)
 515 {
 516     MachineState *machine = MACHINE(qdev_get_machine());
 517     SCLPDevice *sclp = SCLP(dev);
 518     Error *err = NULL;
 519     uint64_t hw_limit;
 520     int ret;
 521
 522     object_property_set_bool(OBJECT(sclp->event_facility), true, "realized",
 523                              &err);
 524     if (err) {
 525         goto out;
 526     }
 527     /*
 528      * qdev_device_add searches the sysbus for TYPE_SCLP_EVENTS_BUS. As long
 529      * as we can't find a fitting bus via the qom tree, we have to add the
 530      * event facility to the sysbus, so e.g. a sclp console can be created.
 531      */
 532     qdev_set_parent_bus(DEVICE(sclp->event_facility), sysbus_get_default());
 533
 534     ret = s390_set_memory_limit(machine->maxram_size, &hw_limit);
 535     if (ret == -E2BIG) {
 536         error_setg(&err, "host supports a maximum of %" PRIu64 " GB",
 537                    hw_limit >> 30);
 538     } else if (ret) {
 539         error_setg(&err, "setting the guest size failed");
 540     }
 541
 542 out:
 543     error_propagate(errp, err);
 544 }
 545
 546 static void sclp_memory_init(SCLPDevice *sclp)
 547 {
 548     MachineState *machine = MACHINE(qdev_get_machine());
 549     ram_addr_t initial_mem = machine->ram_size;
 550     ram_addr_t max_mem = machine->maxram_size;
 551     ram_addr_t standby_mem = max_mem - initial_mem;
 552     ram_addr_t pad_mem = 0;
 553     int increment_size = 20;
 554
 555     /* The storage increment size is a multiple of 1M and is a power of 2.
 556      * The number of storage increments must be MAX_STORAGE_INCREMENTS or fewer.
 557      * The variable 'increment_size' is an exponent of 2 that can be
 558      * used to calculate the size (in bytes) of an increment. */
 559     while ((initial_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
 560         increment_size++;
 561     }
 562     if (machine->ram_slots) {
 563         while ((standby_mem >> increment_size) > MAX_STORAGE_INCREMENTS) {
 564             increment_size++;
 565         }
 566     }
 567     sclp->increment_size = increment_size;
 568
 569     /* The core and standby memory areas need to be aligned with
 570      * the increment size.  In effect, this can cause the
 571      * user-specified memory size to be rounded down to align
 572      * with the nearest increment boundary. */
 573     initial_mem = initial_mem >> increment_size << increment_size;
 574     standby_mem = standby_mem >> increment_size << increment_size;
 575
 576     /* If the size of ram is not on a MEM_SECTION_SIZE boundary,
 577        calculate the pad size necessary to force this boundary. */
 578     if (machine->ram_slots && standby_mem) {
 579         sclpMemoryHotplugDev *mhd = init_sclp_memory_hotplug_dev();
 580
 581         if (initial_mem % MEM_SECTION_SIZE) {
 582             pad_mem = MEM_SECTION_SIZE - initial_mem % MEM_SECTION_SIZE;
 583         }
 584         mhd->increment_size = increment_size;
 585         mhd->pad_size = pad_mem;
 586         mhd->standby_mem_size = standby_mem;
 587     }
 588     machine->ram_size = initial_mem;
 589     machine->maxram_size = initial_mem + pad_mem + standby_mem;
 590     /* let's propagate the changed ram size into the global variable. */
 591     ram_size = initial_mem;
 592 }
 593
 594 static void sclp_init(Object *obj)
 595 {
 596     SCLPDevice *sclp = SCLP(obj);
 597     Object *new;
 598
 599     new = object_new(TYPE_SCLP_EVENT_FACILITY);
 600     object_property_add_child(obj, TYPE_SCLP_EVENT_FACILITY, new, NULL);
 601     object_unref(new);
 602     sclp->event_facility = EVENT_FACILITY(new);
 603
 604     sclp_memory_init(sclp);
 605 }
 606
 607 static void sclp_class_init(ObjectClass *oc, void *data)
 608 {
 609     SCLPDeviceClass *sc = SCLP_CLASS(oc);
 610     DeviceClass *dc = DEVICE_CLASS(oc);
 611
 612     dc->desc = "SCLP (Service-Call Logical Processor)";
 613     dc->realize = sclp_realize;
 614     dc->hotpluggable = false;
 615     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 616
 617     sc->read_SCP_info = read_SCP_info;
 618     sc->read_storage_element0_info = read_storage_element0_info;
 619     sc->read_storage_element1_info = read_storage_element1_info;
 620     sc->attach_storage_element = attach_storage_element;
 621     sc->assign_storage = assign_storage;
 622     sc->unassign_storage = unassign_storage;
 623     sc->read_cpu_info = sclp_read_cpu_info;
 624     sc->execute = sclp_execute;
 625     sc->service_interrupt = service_interrupt;
 626 }
 627
 628 static TypeInfo sclp_info = {
 629     .name = TYPE_SCLP,
 630     .parent = TYPE_DEVICE,
 631     .instance_init = sclp_init,
 632     .instance_size = sizeof(SCLPDevice),
 633     .class_init = sclp_class_init,
 634     .class_size = sizeof(SCLPDeviceClass),
 635 };
 636
 637 sclpMemoryHotplugDev *init_sclp_memory_hotplug_dev(void)
 638 {
 639     DeviceState *dev;
 640     dev = qdev_create(NULL, TYPE_SCLP_MEMORY_HOTPLUG_DEV);
 641     object_property_add_child(qdev_get_machine(),
 642                               TYPE_SCLP_MEMORY_HOTPLUG_DEV,
 643                               OBJECT(dev), NULL);
 644     qdev_init_nofail(dev);
 645     return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
 646                                    TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
 647 }
 648
 649 sclpMemoryHotplugDev *get_sclp_memory_hotplug_dev(void)
 650 {
 651     return SCLP_MEMORY_HOTPLUG_DEV(object_resolve_path(
 652                                    TYPE_SCLP_MEMORY_HOTPLUG_DEV, NULL));
 653 }
 654
 655 static void sclp_memory_hotplug_dev_class_init(ObjectClass *klass,
 656                                                void *data)
 657 {
 658     DeviceClass *dc = DEVICE_CLASS(klass);
 659
 660     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 661 }
 662
 663 static TypeInfo sclp_memory_hotplug_dev_info = {
 664     .name = TYPE_SCLP_MEMORY_HOTPLUG_DEV,
 665     .parent = TYPE_SYS_BUS_DEVICE,
 666     .instance_size = sizeof(sclpMemoryHotplugDev),
 667     .class_init = sclp_memory_hotplug_dev_class_init,
 668 };
 669
 670 static void register_types(void)
 671 {
 672     type_register_static(&sclp_memory_hotplug_dev_info);
 673     type_register_static(&sclp_info);
 674 }
 675 type_init(register_types);