hw/s390x/s390-virtio-bus.c

   1 /*
   2  * QEMU S390 virtio target
   3  *
   4  * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "hw/hw.h"
  21 #include "block/block.h"
  22 #include "sysemu/sysemu.h"
  23 #include "hw/boards.h"
  24 #include "monitor/monitor.h"
  25 #include "hw/loader.h"
  26 #include "elf.h"
  27 #include "hw/virtio.h"
  28 #include "hw/virtio-rng.h"
  29 #include "hw/virtio-serial.h"
  30 #include "hw/virtio-net.h"
  31 #include "hw/sysbus.h"
  32 #include "sysemu/kvm.h"
  33
  34 #include "hw/s390x/s390-virtio-bus.h"
  35 #include "hw/virtio-bus.h"
  36
  37 /* #define DEBUG_S390 */
  38
  39 #ifdef DEBUG_S390
  40 #define dprintf(fmt, ...) \
  41     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  42 #else
  43 #define dprintf(fmt, ...) \
  44     do { } while (0)
  45 #endif
  46
  47 #define VIRTIO_EXT_CODE   0x2603
  48
  49 static const TypeInfo s390_virtio_bus_info = {
  50     .name = TYPE_S390_VIRTIO_BUS,
  51     .parent = TYPE_BUS,
  52     .instance_size = sizeof(VirtIOS390Bus),
  53 };
  54
  55 static const VirtIOBindings virtio_s390_bindings;
  56
  57 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev);
  58
  59 /* length of VirtIO device pages */
  60 const hwaddr virtio_size = S390_DEVICE_PAGES * TARGET_PAGE_SIZE;
  61
  62 static void s390_virtio_bus_reset(void *opaque)
  63 {
  64     VirtIOS390Bus *bus = opaque;
  65     bus->next_ring = bus->dev_page + TARGET_PAGE_SIZE;
  66 }
  67
  68 void s390_virtio_reset_idx(VirtIOS390Device *dev)
  69 {
  70     int i;
  71     hwaddr idx_addr;
  72     uint8_t num_vq;
  73
  74     num_vq = s390_virtio_device_num_vq(dev);
  75     for (i = 0; i < num_vq; i++) {
  76         idx_addr = virtio_queue_get_avail_addr(dev->vdev, i) +
  77             VIRTIO_VRING_AVAIL_IDX_OFFS;
  78         stw_phys(idx_addr, 0);
  79         idx_addr = virtio_queue_get_used_addr(dev->vdev, i) +
  80             VIRTIO_VRING_USED_IDX_OFFS;
  81         stw_phys(idx_addr, 0);
  82     }
  83 }
  84
  85 VirtIOS390Bus *s390_virtio_bus_init(ram_addr_t *ram_size)
  86 {
  87     VirtIOS390Bus *bus;
  88     BusState *_bus;
  89     DeviceState *dev;
  90
  91     /* Create bridge device */
  92     dev = qdev_create(NULL, "s390-virtio-bridge");
  93     qdev_init_nofail(dev);
  94
  95     /* Create bus on bridge device */
  96
  97     _bus = qbus_create(TYPE_S390_VIRTIO_BUS, dev, "s390-virtio");
  98     bus = DO_UPCAST(VirtIOS390Bus, bus, _bus);
  99
 100     bus->dev_page = *ram_size;
 101     bus->dev_offs = bus->dev_page;
 102     bus->next_ring = bus->dev_page + TARGET_PAGE_SIZE;
 103
 104     /* Enable hotplugging */
 105     _bus->allow_hotplug = 1;
 106
 107     /* Allocate RAM for VirtIO device pages (descriptors, queues, rings) */
 108     *ram_size += S390_DEVICE_PAGES * TARGET_PAGE_SIZE;
 109
 110     qemu_register_reset(s390_virtio_bus_reset, bus);
 111     return bus;
 112 }
 113
 114 static void s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
 115 {
 116     if (kvm_enabled()) {
 117         kvm_s390_virtio_irq(cpu, config_change, token);
 118     } else {
 119         cpu_inject_ext(cpu, VIRTIO_EXT_CODE, config_change, token);
 120     }
 121 }
 122
 123 static int s390_virtio_device_init(VirtIOS390Device *dev, VirtIODevice *vdev)
 124 {
 125     VirtIOS390Bus *bus;
 126     int dev_len;
 127
 128     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 129     dev->vdev = vdev;
 130     dev->dev_offs = bus->dev_offs;
 131     dev->feat_len = sizeof(uint32_t); /* always keep 32 bits features */
 132
 133     dev_len = VIRTIO_DEV_OFFS_CONFIG;
 134     dev_len += s390_virtio_device_num_vq(dev) * VIRTIO_VQCONFIG_LEN;
 135     dev_len += dev->feat_len * 2;
 136     dev_len += vdev->config_len;
 137
 138     bus->dev_offs += dev_len;
 139
 140     virtio_bind_device(vdev, &virtio_s390_bindings, DEVICE(dev));
 141     dev->host_features = vdev->get_features(vdev, dev->host_features);
 142     s390_virtio_device_sync(dev);
 143     s390_virtio_reset_idx(dev);
 144     if (dev->qdev.hotplugged) {
 145         S390CPU *cpu = s390_cpu_addr2state(0);
 146         s390_virtio_irq(cpu, VIRTIO_PARAM_DEV_ADD, dev->dev_offs);
 147     }
 148
 149     return 0;
 150 }
 151
 152 static int s390_virtio_net_init(VirtIOS390Device *dev)
 153 {
 154     VirtIODevice *vdev;
 155
 156     vdev = virtio_net_init((DeviceState *)dev, &dev->nic, &dev->net,
 157                            dev->host_features);
 158     if (!vdev) {
 159         return -1;
 160     }
 161
 162     return s390_virtio_device_init(dev, vdev);
 163 }
 164
 165 static int s390_virtio_blk_init(VirtIOS390Device *s390_dev)
 166 {
 167     VirtIOBlkS390 *dev = VIRTIO_BLK_S390(s390_dev);
 168     DeviceState *vdev = DEVICE(&dev->vdev);
 169     virtio_blk_set_conf(vdev, &(dev->blk));
 170     qdev_set_parent_bus(vdev, BUS(&s390_dev->bus));
 171     if (qdev_init(vdev) < 0) {
 172         return -1;
 173     }
 174     return s390_virtio_device_init(s390_dev, VIRTIO_DEVICE(vdev));
 175 }
 176
 177 static void s390_virtio_blk_instance_init(Object *obj)
 178 {
 179     VirtIOBlkS390 *dev = VIRTIO_BLK_S390(obj);
 180     object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_BLK);
 181     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
 182 }
 183
 184 static int s390_virtio_serial_init(VirtIOS390Device *dev)
 185 {
 186     VirtIOS390Bus *bus;
 187     VirtIODevice *vdev;
 188     int r;
 189
 190     bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 191
 192     vdev = virtio_serial_init((DeviceState *)dev, &dev->serial);
 193     if (!vdev) {
 194         return -1;
 195     }
 196
 197     r = s390_virtio_device_init(dev, vdev);
 198     if (!r) {
 199         bus->console = dev;
 200     }
 201
 202     return r;
 203 }
 204
 205 static int s390_virtio_scsi_init(VirtIOS390Device *dev)
 206 {
 207     VirtIODevice *vdev;
 208
 209     vdev = virtio_scsi_init((DeviceState *)dev, &dev->scsi);
 210     if (!vdev) {
 211         return -1;
 212     }
 213
 214     return s390_virtio_device_init(dev, vdev);
 215 }
 216
 217 static int s390_virtio_rng_init(VirtIOS390Device *dev)
 218 {
 219     VirtIODevice *vdev;
 220
 221     vdev = virtio_rng_init((DeviceState *)dev, &dev->rng);
 222     if (!vdev) {
 223         return -1;
 224     }
 225
 226     return s390_virtio_device_init(dev, vdev);
 227 }
 228
 229 static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq)
 230 {
 231     ram_addr_t token_off;
 232
 233     token_off = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 234                 (vq * VIRTIO_VQCONFIG_LEN) +
 235                 VIRTIO_VQCONFIG_OFFS_TOKEN;
 236
 237     return ldq_be_phys(token_off);
 238 }
 239
 240 static ram_addr_t s390_virtio_device_num_vq(VirtIOS390Device *dev)
 241 {
 242     VirtIODevice *vdev = dev->vdev;
 243     int num_vq;
 244
 245     for (num_vq = 0; num_vq < VIRTIO_PCI_QUEUE_MAX; num_vq++) {
 246         if (!virtio_queue_get_num(vdev, num_vq)) {
 247             break;
 248         }
 249     }
 250
 251     return num_vq;
 252 }
 253
 254 static ram_addr_t s390_virtio_next_ring(VirtIOS390Bus *bus)
 255 {
 256     ram_addr_t r = bus->next_ring;
 257
 258     bus->next_ring += VIRTIO_RING_LEN;
 259     return r;
 260 }
 261
 262 void s390_virtio_device_sync(VirtIOS390Device *dev)
 263 {
 264     VirtIOS390Bus *bus = DO_UPCAST(VirtIOS390Bus, bus, dev->qdev.parent_bus);
 265     ram_addr_t cur_offs;
 266     uint8_t num_vq;
 267     int i;
 268
 269     virtio_reset(dev->vdev);
 270
 271     /* Sync dev space */
 272     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_TYPE, dev->vdev->device_id);
 273
 274     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, s390_virtio_device_num_vq(dev));
 275     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_FEATURE_LEN, dev->feat_len);
 276
 277     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG_LEN, dev->vdev->config_len);
 278
 279     num_vq = s390_virtio_device_num_vq(dev);
 280     stb_phys(dev->dev_offs + VIRTIO_DEV_OFFS_NUM_VQ, num_vq);
 281
 282     /* Sync virtqueues */
 283     for (i = 0; i < num_vq; i++) {
 284         ram_addr_t vq = (dev->dev_offs + VIRTIO_DEV_OFFS_CONFIG) +
 285                         (i * VIRTIO_VQCONFIG_LEN);
 286         ram_addr_t vring;
 287
 288         vring = s390_virtio_next_ring(bus);
 289         virtio_queue_set_addr(dev->vdev, i, vring);
 290         virtio_queue_set_vector(dev->vdev, i, i);
 291         stq_be_phys(vq + VIRTIO_VQCONFIG_OFFS_ADDRESS, vring);
 292         stw_be_phys(vq + VIRTIO_VQCONFIG_OFFS_NUM, virtio_queue_get_num(dev->vdev, i));
 293     }
 294
 295     cur_offs = dev->dev_offs;
 296     cur_offs += VIRTIO_DEV_OFFS_CONFIG;
 297     cur_offs += num_vq * VIRTIO_VQCONFIG_LEN;
 298
 299     /* Sync feature bitmap */
 300     stl_le_phys(cur_offs, dev->host_features);
 301
 302     dev->feat_offs = cur_offs + dev->feat_len;
 303     cur_offs += dev->feat_len * 2;
 304
 305     /* Sync config space */
 306     if (dev->vdev->get_config) {
 307         dev->vdev->get_config(dev->vdev, dev->vdev->config);
 308     }
 309
 310     cpu_physical_memory_write(cur_offs,
 311                               dev->vdev->config, dev->vdev->config_len);
 312     cur_offs += dev->vdev->config_len;
 313 }
 314
 315 void s390_virtio_device_update_status(VirtIOS390Device *dev)
 316 {
 317     VirtIODevice *vdev = dev->vdev;
 318     uint32_t features;
 319
 320     virtio_set_status(vdev, ldub_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS));
 321
 322     /* Update guest supported feature bitmap */
 323
 324     features = bswap32(ldl_be_phys(dev->feat_offs));
 325     virtio_set_features(vdev, features);
 326 }
 327
 328 VirtIOS390Device *s390_virtio_bus_console(VirtIOS390Bus *bus)
 329 {
 330     return bus->console;
 331 }
 332
 333 /* Find a device by vring address */
 334 VirtIOS390Device *s390_virtio_bus_find_vring(VirtIOS390Bus *bus,
 335                                              ram_addr_t mem,
 336                                              int *vq_num)
 337 {
 338     BusChild *kid;
 339     int i;
 340
 341     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 342         VirtIOS390Device *dev = (VirtIOS390Device *)kid->child;
 343
 344         for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
 345             if (!virtio_queue_get_addr(dev->vdev, i))
 346                 break;
 347             if (virtio_queue_get_addr(dev->vdev, i) == mem) {
 348                 if (vq_num) {
 349                     *vq_num = i;
 350                 }
 351                 return dev;
 352             }
 353         }
 354     }
 355
 356     return NULL;
 357 }
 358
 359 /* Find a device by device descriptor location */
 360 VirtIOS390Device *s390_virtio_bus_find_mem(VirtIOS390Bus *bus, ram_addr_t mem)
 361 {
 362     BusChild *kid;
 363
 364     QTAILQ_FOREACH(kid, &bus->bus.children, sibling) {
 365         VirtIOS390Device *dev = (VirtIOS390Device *)kid->child;
 366         if (dev->dev_offs == mem) {
 367             return dev;
 368         }
 369     }
 370
 371     return NULL;
 372 }
 373
 374 /* DeviceState to VirtIOS390Device. Note: used on datapath,
 375  * be careful and test performance if you change this.
 376  */
 377 static inline VirtIOS390Device *to_virtio_s390_device_fast(DeviceState *d)
 378 {
 379     return container_of(d, VirtIOS390Device, qdev);
 380 }
 381
 382 /* DeviceState to VirtIOS390Device. TODO: use QOM. */
 383 static inline VirtIOS390Device *to_virtio_s390_device(DeviceState *d)
 384 {
 385     return container_of(d, VirtIOS390Device, qdev);
 386 }
 387
 388 static void virtio_s390_notify(DeviceState *d, uint16_t vector)
 389 {
 390     VirtIOS390Device *dev = to_virtio_s390_device_fast(d);
 391     uint64_t token = s390_virtio_device_vq_token(dev, vector);
 392     S390CPU *cpu = s390_cpu_addr2state(0);
 393
 394     s390_virtio_irq(cpu, 0, token);
 395 }
 396
 397 static unsigned virtio_s390_get_features(DeviceState *d)
 398 {
 399     VirtIOS390Device *dev = to_virtio_s390_device(d);
 400     return dev->host_features;
 401 }
 402
 403 /**************** S390 Virtio Bus Device Descriptions *******************/
 404
 405 static const VirtIOBindings virtio_s390_bindings = {
 406     .notify = virtio_s390_notify,
 407     .get_features = virtio_s390_get_features,
 408 };
 409
 410 static Property s390_virtio_net_properties[] = {
 411     DEFINE_NIC_PROPERTIES(VirtIOS390Device, nic),
 412     DEFINE_VIRTIO_NET_FEATURES(VirtIOS390Device, host_features),
 413     DEFINE_PROP_UINT32("x-txtimer", VirtIOS390Device,
 414                        net.txtimer, TX_TIMER_INTERVAL),
 415     DEFINE_PROP_INT32("x-txburst", VirtIOS390Device,
 416                       net.txburst, TX_BURST),
 417     DEFINE_PROP_STRING("tx", VirtIOS390Device, net.tx),
 418     DEFINE_PROP_END_OF_LIST(),
 419 };
 420
 421 static void s390_virtio_net_class_init(ObjectClass *klass, void *data)
 422 {
 423     DeviceClass *dc = DEVICE_CLASS(klass);
 424     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 425
 426     k->init = s390_virtio_net_init;
 427     dc->props = s390_virtio_net_properties;
 428 }
 429
 430 static const TypeInfo s390_virtio_net = {
 431     .name          = "virtio-net-s390",
 432     .parent        = TYPE_VIRTIO_S390_DEVICE,
 433     .instance_size = sizeof(VirtIOS390Device),
 434     .class_init    = s390_virtio_net_class_init,
 435 };
 436
 437 static Property s390_virtio_blk_properties[] = {
 438     DEFINE_BLOCK_PROPERTIES(VirtIOBlkS390, blk.conf),
 439     DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlkS390, blk.conf),
 440     DEFINE_PROP_STRING("serial", VirtIOBlkS390, blk.serial),
 441 #ifdef __linux__
 442     DEFINE_PROP_BIT("scsi", VirtIOBlkS390, blk.scsi, 0, true),
 443 #endif
 444     DEFINE_PROP_END_OF_LIST(),
 445 };
 446
 447 static void s390_virtio_blk_class_init(ObjectClass *klass, void *data)
 448 {
 449     DeviceClass *dc = DEVICE_CLASS(klass);
 450     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 451
 452     k->init = s390_virtio_blk_init;
 453     dc->props = s390_virtio_blk_properties;
 454 }
 455
 456 static const TypeInfo s390_virtio_blk = {
 457     .name          = "virtio-blk-s390",
 458     .parent        = TYPE_VIRTIO_S390_DEVICE,
 459     .instance_size = sizeof(VirtIOBlkS390),
 460     .instance_init = s390_virtio_blk_instance_init,
 461     .class_init    = s390_virtio_blk_class_init,
 462 };
 463
 464 static Property s390_virtio_serial_properties[] = {
 465     DEFINE_PROP_UINT32("max_ports", VirtIOS390Device,
 466                        serial.max_virtserial_ports, 31),
 467     DEFINE_PROP_END_OF_LIST(),
 468 };
 469
 470 static void s390_virtio_serial_class_init(ObjectClass *klass, void *data)
 471 {
 472     DeviceClass *dc = DEVICE_CLASS(klass);
 473     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 474
 475     k->init = s390_virtio_serial_init;
 476     dc->props = s390_virtio_serial_properties;
 477 }
 478
 479 static const TypeInfo s390_virtio_serial = {
 480     .name          = "virtio-serial-s390",
 481     .parent        = TYPE_VIRTIO_S390_DEVICE,
 482     .instance_size = sizeof(VirtIOS390Device),
 483     .class_init    = s390_virtio_serial_class_init,
 484 };
 485
 486 static void s390_virtio_rng_initfn(Object *obj)
 487 {
 488     VirtIOS390Device *dev = VIRTIO_S390_DEVICE(obj);
 489
 490     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
 491                              (Object **)&dev->rng.rng, NULL);
 492 }
 493
 494 static void s390_virtio_rng_class_init(ObjectClass *klass, void *data)
 495 {
 496     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 497
 498     k->init = s390_virtio_rng_init;
 499 }
 500
 501 static const TypeInfo s390_virtio_rng = {
 502     .name          = "virtio-rng-s390",
 503     .parent        = TYPE_VIRTIO_S390_DEVICE,
 504     .instance_size = sizeof(VirtIOS390Device),
 505     .instance_init = s390_virtio_rng_initfn,
 506     .class_init    = s390_virtio_rng_class_init,
 507 };
 508
 509 static int s390_virtio_busdev_init(DeviceState *dev)
 510 {
 511     VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
 512     VirtIOS390DeviceClass *_info = VIRTIO_S390_DEVICE_GET_CLASS(dev);
 513
 514     virtio_s390_bus_new(&_dev->bus, _dev);
 515
 516     return _info->init(_dev);
 517 }
 518
 519 static void s390_virtio_busdev_reset(DeviceState *dev)
 520 {
 521     VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
 522
 523     virtio_reset(_dev->vdev);
 524 }
 525
 526 static void virtio_s390_device_class_init(ObjectClass *klass, void *data)
 527 {
 528     DeviceClass *dc = DEVICE_CLASS(klass);
 529
 530     dc->init = s390_virtio_busdev_init;
 531     dc->bus_type = TYPE_S390_VIRTIO_BUS;
 532     dc->unplug = qdev_simple_unplug_cb;
 533     dc->reset = s390_virtio_busdev_reset;
 534 }
 535
 536 static const TypeInfo virtio_s390_device_info = {
 537     .name = TYPE_VIRTIO_S390_DEVICE,
 538     .parent = TYPE_DEVICE,
 539     .instance_size = sizeof(VirtIOS390Device),
 540     .class_init = virtio_s390_device_class_init,
 541     .class_size = sizeof(VirtIOS390DeviceClass),
 542     .abstract = true,
 543 };
 544
 545 static Property s390_virtio_scsi_properties[] = {
 546     DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOS390Device, host_features, scsi),
 547     DEFINE_PROP_END_OF_LIST(),
 548 };
 549
 550 static void s390_virtio_scsi_class_init(ObjectClass *klass, void *data)
 551 {
 552     DeviceClass *dc = DEVICE_CLASS(klass);
 553     VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
 554
 555     k->init = s390_virtio_scsi_init;
 556     dc->props = s390_virtio_scsi_properties;
 557 }
 558
 559 static const TypeInfo s390_virtio_scsi = {
 560     .name          = "virtio-scsi-s390",
 561     .parent        = TYPE_VIRTIO_S390_DEVICE,
 562     .instance_size = sizeof(VirtIOS390Device),
 563     .class_init    = s390_virtio_scsi_class_init,
 564 };
 565
 566 /***************** S390 Virtio Bus Bridge Device *******************/
 567 /* Only required to have the virtio bus as child in the system bus */
 568
 569 static int s390_virtio_bridge_init(SysBusDevice *dev)
 570 {
 571     /* nothing */
 572     return 0;
 573 }
 574
 575 static void s390_virtio_bridge_class_init(ObjectClass *klass, void *data)
 576 {
 577     DeviceClass *dc = DEVICE_CLASS(klass);
 578     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
 579
 580     k->init = s390_virtio_bridge_init;
 581     dc->no_user = 1;
 582 }
 583
 584 static const TypeInfo s390_virtio_bridge_info = {
 585     .name          = "s390-virtio-bridge",
 586     .parent        = TYPE_SYS_BUS_DEVICE,
 587     .instance_size = sizeof(SysBusDevice),
 588     .class_init    = s390_virtio_bridge_class_init,
 589 };
 590
 591 /* virtio-s390-bus */
 592
 593 void virtio_s390_bus_new(VirtioBusState *bus, VirtIOS390Device *dev)
 594 {
 595     DeviceState *qdev = DEVICE(dev);
 596     BusState *qbus;
 597     qbus_create_inplace((BusState *)bus, TYPE_VIRTIO_S390_BUS, qdev, NULL);
 598     qbus = BUS(bus);
 599     qbus->allow_hotplug = 1;
 600 }
 601
 602 static void virtio_s390_bus_class_init(ObjectClass *klass, void *data)
 603 {
 604     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
 605     BusClass *bus_class = BUS_CLASS(klass);
 606     bus_class->max_dev = 1;
 607     k->notify = virtio_s390_notify;
 608     k->get_features = virtio_s390_get_features;
 609 }
 610
 611 static const TypeInfo virtio_s390_bus_info = {
 612     .name          = TYPE_VIRTIO_S390_BUS,
 613     .parent        = TYPE_VIRTIO_BUS,
 614     .instance_size = sizeof(VirtioS390BusState),
 615     .class_init    = virtio_s390_bus_class_init,
 616 };
 617
 618 static void s390_virtio_register_types(void)
 619 {
 620     type_register_static(&virtio_s390_bus_info);
 621     type_register_static(&s390_virtio_bus_info);
 622     type_register_static(&virtio_s390_device_info);
 623     type_register_static(&s390_virtio_serial);
 624     type_register_static(&s390_virtio_blk);
 625     type_register_static(&s390_virtio_net);
 626     type_register_static(&s390_virtio_scsi);
 627     type_register_static(&s390_virtio_rng);
 628     type_register_static(&s390_virtio_bridge_info);
 629 }
 630
 631 type_init(s390_virtio_register_types)