hw/s390x/virtio-ccw.c

   1 /*
   2  * virtio ccw target implementation
   3  *
   4  * Copyright 2012,2014 IBM Corp.
   5  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   6  *
   7  * This work is licensed under the terms of the GNU GPL, version 2 or (at
   8  * your option) any later version. See the COPYING file in the top-level
   9  * directory.
  10  */
  11
  12 #include "hw/hw.h"
  13 #include "block/block.h"
  14 #include "sysemu/blockdev.h"
  15 #include "sysemu/sysemu.h"
  16 #include "net/net.h"
  17 #include "monitor/monitor.h"
  18 #include "hw/virtio/virtio.h"
  19 #include "hw/virtio/virtio-serial.h"
  20 #include "hw/virtio/virtio-net.h"
  21 #include "hw/sysbus.h"
  22 #include "qemu/bitops.h"
  23 #include "hw/virtio/virtio-bus.h"
  24 #include "hw/s390x/adapter.h"
  25 #include "hw/s390x/s390_flic.h"
  26
  27 #include "ioinst.h"
  28 #include "css.h"
  29 #include "virtio-ccw.h"
  30 #include "trace.h"
  31
  32 static QTAILQ_HEAD(, IndAddr) indicator_addresses =
  33     QTAILQ_HEAD_INITIALIZER(indicator_addresses);
  34
  35 static IndAddr *get_indicator(hwaddr ind_addr, int len)
  36 {
  37     IndAddr *indicator;
  38
  39     QTAILQ_FOREACH(indicator, &indicator_addresses, sibling) {
  40         if (indicator->addr == ind_addr) {
  41             indicator->refcnt++;
  42             return indicator;
  43         }
  44     }
  45     indicator = g_new0(IndAddr, 1);
  46     indicator->addr = ind_addr;
  47     indicator->len = len;
  48     indicator->refcnt = 1;
  49     QTAILQ_INSERT_TAIL(&indicator_addresses, indicator, sibling);
  50     return indicator;
  51 }
  52
  53 static int s390_io_adapter_map(AdapterInfo *adapter, uint64_t map_addr,
  54                                bool do_map)
  55 {
  56     S390FLICState *fs = s390_get_flic();
  57     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
  58
  59     return fsc->io_adapter_map(fs, adapter->adapter_id, map_addr, do_map);
  60 }
  61
  62 static void release_indicator(AdapterInfo *adapter, IndAddr *indicator)
  63 {
  64     assert(indicator->refcnt > 0);
  65     indicator->refcnt--;
  66     if (indicator->refcnt > 0) {
  67         return;
  68     }
  69     QTAILQ_REMOVE(&indicator_addresses, indicator, sibling);
  70     if (indicator->map) {
  71         s390_io_adapter_map(adapter, indicator->map, false);
  72     }
  73     g_free(indicator);
  74 }
  75
  76 static int map_indicator(AdapterInfo *adapter, IndAddr *indicator)
  77 {
  78     int ret;
  79
  80     if (indicator->map) {
  81         return 0; /* already mapped is not an error */
  82     }
  83     indicator->map = indicator->addr;
  84     ret = s390_io_adapter_map(adapter, indicator->map, true);
  85     if ((ret != 0) && (ret != -ENOSYS)) {
  86         goto out_err;
  87     }
  88     return 0;
  89
  90 out_err:
  91     indicator->map = 0;
  92     return ret;
  93 }
  94
  95 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size,
  96                                VirtioCcwDevice *dev);
  97
  98 static void virtual_css_bus_reset(BusState *qbus)
  99 {
 100     /* This should actually be modelled via the generic css */
 101     css_reset();
 102 }
 103
 104
 105 static void virtual_css_bus_class_init(ObjectClass *klass, void *data)
 106 {
 107     BusClass *k = BUS_CLASS(klass);
 108
 109     k->reset = virtual_css_bus_reset;
 110 }
 111
 112 static const TypeInfo virtual_css_bus_info = {
 113     .name = TYPE_VIRTUAL_CSS_BUS,
 114     .parent = TYPE_BUS,
 115     .instance_size = sizeof(VirtualCssBus),
 116     .class_init = virtual_css_bus_class_init,
 117 };
 118
 119 VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch)
 120 {
 121     VirtIODevice *vdev = NULL;
 122     VirtioCcwDevice *dev = sch->driver_data;
 123
 124     if (dev) {
 125         vdev = virtio_bus_get_device(&dev->bus);
 126     }
 127     return vdev;
 128 }
 129
 130 static int virtio_ccw_set_guest2host_notifier(VirtioCcwDevice *dev, int n,
 131                                               bool assign, bool set_handler)
 132 {
 133     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
 134     VirtQueue *vq = virtio_get_queue(vdev, n);
 135     EventNotifier *notifier = virtio_queue_get_host_notifier(vq);
 136     int r = 0;
 137     SubchDev *sch = dev->sch;
 138     uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid;
 139
 140     if (assign) {
 141         r = event_notifier_init(notifier, 1);
 142         if (r < 0) {
 143             error_report("%s: unable to init event notifier: %d", __func__, r);
 144             return r;
 145         }
 146         virtio_queue_set_host_notifier_fd_handler(vq, true, set_handler);
 147         r = s390_assign_subch_ioeventfd(notifier, sch_id, n, assign);
 148         if (r < 0) {
 149             error_report("%s: unable to assign ioeventfd: %d", __func__, r);
 150             virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 151             event_notifier_cleanup(notifier);
 152             return r;
 153         }
 154     } else {
 155         virtio_queue_set_host_notifier_fd_handler(vq, false, false);
 156         s390_assign_subch_ioeventfd(notifier, sch_id, n, assign);
 157         event_notifier_cleanup(notifier);
 158     }
 159     return r;
 160 }
 161
 162 static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev)
 163 {
 164     VirtIODevice *vdev;
 165     int n, r;
 166
 167     if (!(dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) ||
 168         dev->ioeventfd_disabled ||
 169         dev->ioeventfd_started) {
 170         return;
 171     }
 172     vdev = virtio_bus_get_device(&dev->bus);
 173     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 174         if (!virtio_queue_get_num(vdev, n)) {
 175             continue;
 176         }
 177         r = virtio_ccw_set_guest2host_notifier(dev, n, true, true);
 178         if (r < 0) {
 179             goto assign_error;
 180         }
 181     }
 182     dev->ioeventfd_started = true;
 183     return;
 184
 185   assign_error:
 186     while (--n >= 0) {
 187         if (!virtio_queue_get_num(vdev, n)) {
 188             continue;
 189         }
 190         r = virtio_ccw_set_guest2host_notifier(dev, n, false, false);
 191         assert(r >= 0);
 192     }
 193     dev->ioeventfd_started = false;
 194     /* Disable ioeventfd for this device. */
 195     dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD;
 196     error_report("%s: failed. Fallback to userspace (slower).", __func__);
 197 }
 198
 199 static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev)
 200 {
 201     VirtIODevice *vdev;
 202     int n, r;
 203
 204     if (!dev->ioeventfd_started) {
 205         return;
 206     }
 207     vdev = virtio_bus_get_device(&dev->bus);
 208     for (n = 0; n < VIRTIO_PCI_QUEUE_MAX; n++) {
 209         if (!virtio_queue_get_num(vdev, n)) {
 210             continue;
 211         }
 212         r = virtio_ccw_set_guest2host_notifier(dev, n, false, false);
 213         assert(r >= 0);
 214     }
 215     dev->ioeventfd_started = false;
 216 }
 217
 218 VirtualCssBus *virtual_css_bus_init(void)
 219 {
 220     VirtualCssBus *cbus;
 221     BusState *bus;
 222     DeviceState *dev;
 223
 224     /* Create bridge device */
 225     dev = qdev_create(NULL, "virtual-css-bridge");
 226     qdev_init_nofail(dev);
 227
 228     /* Create bus on bridge device */
 229     bus = qbus_create(TYPE_VIRTUAL_CSS_BUS, dev, "virtual-css");
 230     cbus = VIRTUAL_CSS_BUS(bus);
 231
 232     /* Enable hotplugging */
 233     qbus_set_hotplug_handler(bus, dev, &error_abort);
 234
 235     return cbus;
 236 }
 237
 238 /* Communication blocks used by several channel commands. */
 239 typedef struct VqInfoBlock {
 240     uint64_t queue;
 241     uint32_t align;
 242     uint16_t index;
 243     uint16_t num;
 244 } QEMU_PACKED VqInfoBlock;
 245
 246 typedef struct VqConfigBlock {
 247     uint16_t index;
 248     uint16_t num_max;
 249 } QEMU_PACKED VqConfigBlock;
 250
 251 typedef struct VirtioFeatDesc {
 252     uint32_t features;
 253     uint8_t index;
 254 } QEMU_PACKED VirtioFeatDesc;
 255
 256 typedef struct VirtioThinintInfo {
 257     hwaddr summary_indicator;
 258     hwaddr device_indicator;
 259     uint64_t ind_bit;
 260     uint8_t isc;
 261 } QEMU_PACKED VirtioThinintInfo;
 262
 263 /* Specify where the virtqueues for the subchannel are in guest memory. */
 264 static int virtio_ccw_set_vqs(SubchDev *sch, uint64_t addr, uint32_t align,
 265                               uint16_t index, uint16_t num)
 266 {
 267     VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
 268
 269     if (index > VIRTIO_PCI_QUEUE_MAX) {
 270         return -EINVAL;
 271     }
 272
 273     /* Current code in virtio.c relies on 4K alignment. */
 274     if (addr && (align != 4096)) {
 275         return -EINVAL;
 276     }
 277
 278     if (!vdev) {
 279         return -EINVAL;
 280     }
 281
 282     virtio_queue_set_addr(vdev, index, addr);
 283     if (!addr) {
 284         virtio_queue_set_vector(vdev, index, 0);
 285     } else {
 286         /* Fail if we don't have a big enough queue. */
 287         /* TODO: Add interface to handle vring.num changing */
 288         if (virtio_queue_get_num(vdev, index) > num) {
 289             return -EINVAL;
 290         }
 291         virtio_queue_set_vector(vdev, index, index);
 292     }
 293     /* tell notify handler in case of config change */
 294     vdev->config_vector = VIRTIO_PCI_QUEUE_MAX;
 295     return 0;
 296 }
 297
 298 static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw)
 299 {
 300     int ret;
 301     VqInfoBlock info;
 302     uint8_t status;
 303     VirtioFeatDesc features;
 304     void *config;
 305     hwaddr indicators;
 306     VqConfigBlock vq_config;
 307     VirtioCcwDevice *dev = sch->driver_data;
 308     VirtIODevice *vdev = virtio_ccw_get_vdev(sch);
 309     bool check_len;
 310     int len;
 311     hwaddr hw_len;
 312     VirtioThinintInfo *thinint;
 313
 314     if (!dev) {
 315         return -EINVAL;
 316     }
 317
 318     trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid,
 319                                    ccw.cmd_code);
 320     check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC));
 321
 322     /* Look at the command. */
 323     switch (ccw.cmd_code) {
 324     case CCW_CMD_SET_VQ:
 325         if (check_len) {
 326             if (ccw.count != sizeof(info)) {
 327                 ret = -EINVAL;
 328                 break;
 329             }
 330         } else if (ccw.count < sizeof(info)) {
 331             /* Can't execute command. */
 332             ret = -EINVAL;
 333             break;
 334         }
 335         if (!ccw.cda) {
 336             ret = -EFAULT;
 337         } else {
 338             info.queue = ldq_phys(&address_space_memory, ccw.cda);
 339             info.align = ldl_phys(&address_space_memory,
 340                                   ccw.cda + sizeof(info.queue));
 341             info.index = lduw_phys(&address_space_memory,
 342                                    ccw.cda + sizeof(info.queue)
 343                                    + sizeof(info.align));
 344             info.num = lduw_phys(&address_space_memory,
 345                                  ccw.cda + sizeof(info.queue)
 346                                  + sizeof(info.align)
 347                                  + sizeof(info.index));
 348             ret = virtio_ccw_set_vqs(sch, info.queue, info.align, info.index,
 349                                      info.num);
 350             sch->curr_status.scsw.count = 0;
 351         }
 352         break;
 353     case CCW_CMD_VDEV_RESET:
 354         virtio_ccw_stop_ioeventfd(dev);
 355         virtio_reset(vdev);
 356         ret = 0;
 357         break;
 358     case CCW_CMD_READ_FEAT:
 359         if (check_len) {
 360             if (ccw.count != sizeof(features)) {
 361                 ret = -EINVAL;
 362                 break;
 363             }
 364         } else if (ccw.count < sizeof(features)) {
 365             /* Can't execute command. */
 366             ret = -EINVAL;
 367             break;
 368         }
 369         if (!ccw.cda) {
 370             ret = -EFAULT;
 371         } else {
 372             features.index = ldub_phys(&address_space_memory,
 373                                        ccw.cda + sizeof(features.features));
 374             if (features.index < ARRAY_SIZE(dev->host_features)) {
 375                 features.features = dev->host_features[features.index];
 376             } else {
 377                 /* Return zeroes if the guest supports more feature bits. */
 378                 features.features = 0;
 379             }
 380             stl_le_phys(&address_space_memory, ccw.cda, features.features);
 381             sch->curr_status.scsw.count = ccw.count - sizeof(features);
 382             ret = 0;
 383         }
 384         break;
 385     case CCW_CMD_WRITE_FEAT:
 386         if (check_len) {
 387             if (ccw.count != sizeof(features)) {
 388                 ret = -EINVAL;
 389                 break;
 390             }
 391         } else if (ccw.count < sizeof(features)) {
 392             /* Can't execute command. */
 393             ret = -EINVAL;
 394             break;
 395         }
 396         if (!ccw.cda) {
 397             ret = -EFAULT;
 398         } else {
 399             features.index = ldub_phys(&address_space_memory,
 400                                        ccw.cda + sizeof(features.features));
 401             features.features = ldl_le_phys(&address_space_memory, ccw.cda);
 402             if (features.index < ARRAY_SIZE(dev->host_features)) {
 403                 virtio_bus_set_vdev_features(&dev->bus, features.features);
 404                 vdev->guest_features = features.features;
 405             } else {
 406                 /*
 407                  * If the guest supports more feature bits, assert that it
 408                  * passes us zeroes for those we don't support.
 409                  */
 410                 if (features.features) {
 411                     fprintf(stderr, "Guest bug: features[%i]=%x (expected 0)\n",
 412                             features.index, features.features);
 413                     /* XXX: do a unit check here? */
 414                 }
 415             }
 416             sch->curr_status.scsw.count = ccw.count - sizeof(features);
 417             ret = 0;
 418         }
 419         break;
 420     case CCW_CMD_READ_CONF:
 421         if (check_len) {
 422             if (ccw.count > vdev->config_len) {
 423                 ret = -EINVAL;
 424                 break;
 425             }
 426         }
 427         len = MIN(ccw.count, vdev->config_len);
 428         if (!ccw.cda) {
 429             ret = -EFAULT;
 430         } else {
 431             virtio_bus_get_vdev_config(&dev->bus, vdev->config);
 432             /* XXX config space endianness */
 433             cpu_physical_memory_write(ccw.cda, vdev->config, len);
 434             sch->curr_status.scsw.count = ccw.count - len;
 435             ret = 0;
 436         }
 437         break;
 438     case CCW_CMD_WRITE_CONF:
 439         if (check_len) {
 440             if (ccw.count > vdev->config_len) {
 441                 ret = -EINVAL;
 442                 break;
 443             }
 444         }
 445         len = MIN(ccw.count, vdev->config_len);
 446         hw_len = len;
 447         if (!ccw.cda) {
 448             ret = -EFAULT;
 449         } else {
 450             config = cpu_physical_memory_map(ccw.cda, &hw_len, 0);
 451             if (!config) {
 452                 ret = -EFAULT;
 453             } else {
 454                 len = hw_len;
 455                 /* XXX config space endianness */
 456                 memcpy(vdev->config, config, len);
 457                 cpu_physical_memory_unmap(config, hw_len, 0, hw_len);
 458                 virtio_bus_set_vdev_config(&dev->bus, vdev->config);
 459                 sch->curr_status.scsw.count = ccw.count - len;
 460                 ret = 0;
 461             }
 462         }
 463         break;
 464     case CCW_CMD_WRITE_STATUS:
 465         if (check_len) {
 466             if (ccw.count != sizeof(status)) {
 467                 ret = -EINVAL;
 468                 break;
 469             }
 470         } else if (ccw.count < sizeof(status)) {
 471             /* Can't execute command. */
 472             ret = -EINVAL;
 473             break;
 474         }
 475         if (!ccw.cda) {
 476             ret = -EFAULT;
 477         } else {
 478             status = ldub_phys(&address_space_memory, ccw.cda);
 479             if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) {
 480                 virtio_ccw_stop_ioeventfd(dev);
 481             }
 482             virtio_set_status(vdev, status);
 483             if (vdev->status == 0) {
 484                 virtio_reset(vdev);
 485             }
 486             if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
 487                 virtio_ccw_start_ioeventfd(dev);
 488             }
 489             sch->curr_status.scsw.count = ccw.count - sizeof(status);
 490             ret = 0;
 491         }
 492         break;
 493     case CCW_CMD_SET_IND:
 494         if (check_len) {
 495             if (ccw.count != sizeof(indicators)) {
 496                 ret = -EINVAL;
 497                 break;
 498             }
 499         } else if (ccw.count < sizeof(indicators)) {
 500             /* Can't execute command. */
 501             ret = -EINVAL;
 502             break;
 503         }
 504         if (sch->thinint_active) {
 505             /* Trigger a command reject. */
 506             ret = -ENOSYS;
 507             break;
 508         }
 509         if (!ccw.cda) {
 510             ret = -EFAULT;
 511         } else {
 512             indicators = ldq_phys(&address_space_memory, ccw.cda);
 513             dev->indicators = get_indicator(indicators, sizeof(uint64_t));
 514             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
 515             ret = 0;
 516         }
 517         break;
 518     case CCW_CMD_SET_CONF_IND:
 519         if (check_len) {
 520             if (ccw.count != sizeof(indicators)) {
 521                 ret = -EINVAL;
 522                 break;
 523             }
 524         } else if (ccw.count < sizeof(indicators)) {
 525             /* Can't execute command. */
 526             ret = -EINVAL;
 527             break;
 528         }
 529         if (!ccw.cda) {
 530             ret = -EFAULT;
 531         } else {
 532             indicators = ldq_phys(&address_space_memory, ccw.cda);
 533             dev->indicators2 = get_indicator(indicators, sizeof(uint64_t));
 534             sch->curr_status.scsw.count = ccw.count - sizeof(indicators);
 535             ret = 0;
 536         }
 537         break;
 538     case CCW_CMD_READ_VQ_CONF:
 539         if (check_len) {
 540             if (ccw.count != sizeof(vq_config)) {
 541                 ret = -EINVAL;
 542                 break;
 543             }
 544         } else if (ccw.count < sizeof(vq_config)) {
 545             /* Can't execute command. */
 546             ret = -EINVAL;
 547             break;
 548         }
 549         if (!ccw.cda) {
 550             ret = -EFAULT;
 551         } else {
 552             vq_config.index = lduw_phys(&address_space_memory, ccw.cda);
 553             vq_config.num_max = virtio_queue_get_num(vdev,
 554                                                      vq_config.index);
 555             stw_phys(&address_space_memory,
 556                      ccw.cda + sizeof(vq_config.index), vq_config.num_max);
 557             sch->curr_status.scsw.count = ccw.count - sizeof(vq_config);
 558             ret = 0;
 559         }
 560         break;
 561     case CCW_CMD_SET_IND_ADAPTER:
 562         if (check_len) {
 563             if (ccw.count != sizeof(*thinint)) {
 564                 ret = -EINVAL;
 565                 break;
 566             }
 567         } else if (ccw.count < sizeof(*thinint)) {
 568             /* Can't execute command. */
 569             ret = -EINVAL;
 570             break;
 571         }
 572         len = sizeof(*thinint);
 573         hw_len = len;
 574         if (!ccw.cda) {
 575             ret = -EFAULT;
 576         } else if (dev->indicators && !sch->thinint_active) {
 577             /* Trigger a command reject. */
 578             ret = -ENOSYS;
 579         } else {
 580             thinint = cpu_physical_memory_map(ccw.cda, &hw_len, 0);
 581             if (!thinint) {
 582                 ret = -EFAULT;
 583             } else {
 584                 len = hw_len;
 585                 dev->summary_indicator =
 586                     get_indicator(thinint->summary_indicator, sizeof(uint8_t));
 587                 dev->indicators = get_indicator(thinint->device_indicator,
 588                                                 thinint->ind_bit / 8 + 1);
 589                 dev->thinint_isc = thinint->isc;
 590                 dev->routes.adapter.ind_offset = thinint->ind_bit;
 591                 dev->routes.adapter.summary_offset = 7;
 592                 cpu_physical_memory_unmap(thinint, hw_len, 0, hw_len);
 593                 ret = css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
 594                                               dev->thinint_isc, true, false,
 595                                               &dev->routes.adapter.adapter_id);
 596                 assert(ret == 0);
 597                 sch->thinint_active = ((dev->indicators != NULL) &&
 598                                        (dev->summary_indicator != NULL));
 599                 sch->curr_status.scsw.count = ccw.count - len;
 600                 ret = 0;
 601             }
 602         }
 603         break;
 604     default:
 605         ret = -ENOSYS;
 606         break;
 607     }
 608     return ret;
 609 }
 610
 611 static int virtio_ccw_device_init(VirtioCcwDevice *dev, VirtIODevice *vdev)
 612 {
 613     unsigned int cssid = 0;
 614     unsigned int ssid = 0;
 615     unsigned int schid;
 616     unsigned int devno;
 617     bool have_devno = false;
 618     bool found = false;
 619     SubchDev *sch;
 620     int ret;
 621     int num;
 622     DeviceState *parent = DEVICE(dev);
 623
 624     sch = g_malloc0(sizeof(SubchDev));
 625
 626     sch->driver_data = dev;
 627     dev->sch = sch;
 628
 629     dev->indicators = NULL;
 630
 631     /* Initialize subchannel structure. */
 632     sch->channel_prog = 0x0;
 633     sch->last_cmd_valid = false;
 634     sch->thinint_active = false;
 635     /*
 636      * Use a device number if provided. Otherwise, fall back to subchannel
 637      * number.
 638      */
 639     if (dev->bus_id) {
 640         num = sscanf(dev->bus_id, "%x.%x.%04x", &cssid, &ssid, &devno);
 641         if (num == 3) {
 642             if ((cssid > MAX_CSSID) || (ssid > MAX_SSID)) {
 643                 ret = -EINVAL;
 644                 error_report("Invalid cssid or ssid: cssid %x, ssid %x",
 645                              cssid, ssid);
 646                 goto out_err;
 647             }
 648             /* Enforce use of virtual cssid. */
 649             if (cssid != VIRTUAL_CSSID) {
 650                 ret = -EINVAL;
 651                 error_report("cssid %x not valid for virtio devices", cssid);
 652                 goto out_err;
 653             }
 654             if (css_devno_used(cssid, ssid, devno)) {
 655                 ret = -EEXIST;
 656                 error_report("Device %x.%x.%04x already exists", cssid, ssid,
 657                              devno);
 658                 goto out_err;
 659             }
 660             sch->cssid = cssid;
 661             sch->ssid = ssid;
 662             sch->devno = devno;
 663             have_devno = true;
 664         } else {
 665             ret = -EINVAL;
 666             error_report("Malformed devno parameter '%s'", dev->bus_id);
 667             goto out_err;
 668         }
 669     }
 670
 671     /* Find the next free id. */
 672     if (have_devno) {
 673         for (schid = 0; schid <= MAX_SCHID; schid++) {
 674             if (!css_find_subch(1, cssid, ssid, schid)) {
 675                 sch->schid = schid;
 676                 css_subch_assign(cssid, ssid, schid, devno, sch);
 677                 found = true;
 678                 break;
 679             }
 680         }
 681         if (!found) {
 682             ret = -ENODEV;
 683             error_report("No free subchannel found for %x.%x.%04x", cssid, ssid,
 684                          devno);
 685             goto out_err;
 686         }
 687         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
 688                                     "user-configured");
 689     } else {
 690         cssid = VIRTUAL_CSSID;
 691         for (ssid = 0; ssid <= MAX_SSID; ssid++) {
 692             for (schid = 0; schid <= MAX_SCHID; schid++) {
 693                 if (!css_find_subch(1, cssid, ssid, schid)) {
 694                     sch->cssid = cssid;
 695                     sch->ssid = ssid;
 696                     sch->schid = schid;
 697                     devno = schid;
 698                     /*
 699                      * If the devno is already taken, look further in this
 700                      * subchannel set.
 701                      */
 702                     while (css_devno_used(cssid, ssid, devno)) {
 703                         if (devno == MAX_SCHID) {
 704                             devno = 0;
 705                         } else if (devno == schid - 1) {
 706                             ret = -ENODEV;
 707                             error_report("No free devno found");
 708                             goto out_err;
 709                         } else {
 710                             devno++;
 711                         }
 712                     }
 713                     sch->devno = devno;
 714                     css_subch_assign(cssid, ssid, schid, devno, sch);
 715                     found = true;
 716                     break;
 717                 }
 718             }
 719             if (found) {
 720                 break;
 721             }
 722         }
 723         if (!found) {
 724             ret = -ENODEV;
 725             error_report("Virtual channel subsystem is full!");
 726             goto out_err;
 727         }
 728         trace_virtio_ccw_new_device(cssid, ssid, schid, devno,
 729                                     "auto-configured");
 730     }
 731
 732     /* Build initial schib. */
 733     css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE);
 734
 735     sch->ccw_cb = virtio_ccw_cb;
 736
 737     /* Build senseid data. */
 738     memset(&sch->id, 0, sizeof(SenseId));
 739     sch->id.reserved = 0xff;
 740     sch->id.cu_type = VIRTIO_CCW_CU_TYPE;
 741     sch->id.cu_model = vdev->device_id;
 742
 743     /* Only the first 32 feature bits are used. */
 744     dev->host_features[0] = virtio_bus_get_vdev_features(&dev->bus,
 745                                                          dev->host_features[0]);
 746
 747     dev->host_features[0] |= 0x1 << VIRTIO_F_NOTIFY_ON_EMPTY;
 748     dev->host_features[0] |= 0x1 << VIRTIO_F_BAD_FEATURE;
 749
 750     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid,
 751                           parent->hotplugged, 1);
 752     return 0;
 753
 754 out_err:
 755     dev->sch = NULL;
 756     g_free(sch);
 757     return ret;
 758 }
 759
 760 static int virtio_ccw_exit(VirtioCcwDevice *dev)
 761 {
 762     SubchDev *sch = dev->sch;
 763
 764     if (sch) {
 765         css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL);
 766         g_free(sch);
 767     }
 768     if (dev->indicators) {
 769         release_indicator(&dev->routes.adapter, dev->indicators);
 770         dev->indicators = NULL;
 771     }
 772     return 0;
 773 }
 774
 775 static int virtio_ccw_net_init(VirtioCcwDevice *ccw_dev)
 776 {
 777     DeviceState *qdev = DEVICE(ccw_dev);
 778     VirtIONetCcw *dev = VIRTIO_NET_CCW(ccw_dev);
 779     DeviceState *vdev = DEVICE(&dev->vdev);
 780
 781     virtio_net_set_config_size(&dev->vdev, ccw_dev->host_features[0]);
 782     virtio_net_set_netclient_name(&dev->vdev, qdev->id,
 783                                   object_get_typename(OBJECT(qdev)));
 784     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 785     if (qdev_init(vdev) < 0) {
 786         return -1;
 787     }
 788
 789     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 790 }
 791
 792 static void virtio_ccw_net_instance_init(Object *obj)
 793 {
 794     VirtIONetCcw *dev = VIRTIO_NET_CCW(obj);
 795
 796     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 797                                 TYPE_VIRTIO_NET);
 798     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
 799                               "bootindex", &error_abort);
 800 }
 801
 802 static int virtio_ccw_blk_init(VirtioCcwDevice *ccw_dev)
 803 {
 804     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(ccw_dev);
 805     DeviceState *vdev = DEVICE(&dev->vdev);
 806     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 807     if (qdev_init(vdev) < 0) {
 808         return -1;
 809     }
 810
 811     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 812 }
 813
 814 static void virtio_ccw_blk_instance_init(Object *obj)
 815 {
 816     VirtIOBlkCcw *dev = VIRTIO_BLK_CCW(obj);
 817
 818     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 819                                 TYPE_VIRTIO_BLK);
 820     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev),"iothread",
 821                               &error_abort);
 822     object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
 823                               "bootindex", &error_abort);
 824 }
 825
 826 static int virtio_ccw_serial_init(VirtioCcwDevice *ccw_dev)
 827 {
 828     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(ccw_dev);
 829     DeviceState *vdev = DEVICE(&dev->vdev);
 830     DeviceState *proxy = DEVICE(ccw_dev);
 831     char *bus_name;
 832
 833     /*
 834      * For command line compatibility, this sets the virtio-serial-device bus
 835      * name as before.
 836      */
 837     if (proxy->id) {
 838         bus_name = g_strdup_printf("%s.0", proxy->id);
 839         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
 840         g_free(bus_name);
 841     }
 842
 843     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 844     if (qdev_init(vdev) < 0) {
 845         return -1;
 846     }
 847
 848     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 849 }
 850
 851
 852 static void virtio_ccw_serial_instance_init(Object *obj)
 853 {
 854     VirtioSerialCcw *dev = VIRTIO_SERIAL_CCW(obj);
 855
 856     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 857                                 TYPE_VIRTIO_SERIAL);
 858 }
 859
 860 static int virtio_ccw_balloon_init(VirtioCcwDevice *ccw_dev)
 861 {
 862     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(ccw_dev);
 863     DeviceState *vdev = DEVICE(&dev->vdev);
 864
 865     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 866     if (qdev_init(vdev) < 0) {
 867         return -1;
 868     }
 869
 870     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 871 }
 872
 873 static void balloon_ccw_stats_get_all(Object *obj, struct Visitor *v,
 874                                       void *opaque, const char *name,
 875                                       Error **errp)
 876 {
 877     VirtIOBalloonCcw *dev = opaque;
 878     object_property_get(OBJECT(&dev->vdev), v, "guest-stats", errp);
 879 }
 880
 881 static void balloon_ccw_stats_get_poll_interval(Object *obj, struct Visitor *v,
 882                                                 void *opaque, const char *name,
 883                                                 Error **errp)
 884 {
 885     VirtIOBalloonCcw *dev = opaque;
 886     object_property_get(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
 887                         errp);
 888 }
 889
 890 static void balloon_ccw_stats_set_poll_interval(Object *obj, struct Visitor *v,
 891                                                 void *opaque, const char *name,
 892                                                 Error **errp)
 893 {
 894     VirtIOBalloonCcw *dev = opaque;
 895     object_property_set(OBJECT(&dev->vdev), v, "guest-stats-polling-interval",
 896                         errp);
 897 }
 898
 899 static void virtio_ccw_balloon_instance_init(Object *obj)
 900 {
 901     VirtIOBalloonCcw *dev = VIRTIO_BALLOON_CCW(obj);
 902     object_initialize(&dev->vdev, sizeof(dev->vdev), TYPE_VIRTIO_BALLOON);
 903     object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
 904     object_unref(OBJECT(&dev->vdev));
 905     object_property_add(obj, "guest-stats", "guest statistics",
 906                         balloon_ccw_stats_get_all, NULL, NULL, dev, NULL);
 907
 908     object_property_add(obj, "guest-stats-polling-interval", "int",
 909                         balloon_ccw_stats_get_poll_interval,
 910                         balloon_ccw_stats_set_poll_interval,
 911                         NULL, dev, NULL);
 912 }
 913
 914 static int virtio_ccw_scsi_init(VirtioCcwDevice *ccw_dev)
 915 {
 916     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(ccw_dev);
 917     DeviceState *vdev = DEVICE(&dev->vdev);
 918     DeviceState *qdev = DEVICE(ccw_dev);
 919     char *bus_name;
 920
 921     /*
 922      * For command line compatibility, this sets the virtio-scsi-device bus
 923      * name as before.
 924      */
 925     if (qdev->id) {
 926         bus_name = g_strdup_printf("%s.0", qdev->id);
 927         virtio_device_set_child_bus_name(VIRTIO_DEVICE(vdev), bus_name);
 928         g_free(bus_name);
 929     }
 930
 931     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 932     if (qdev_init(vdev) < 0) {
 933         return -1;
 934     }
 935
 936     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 937 }
 938
 939 static void virtio_ccw_scsi_instance_init(Object *obj)
 940 {
 941     VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(obj);
 942
 943     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 944                                 TYPE_VIRTIO_SCSI);
 945     object_property_add_alias(obj, "iothread", OBJECT(&dev->vdev), "iothread",
 946                               &error_abort);
 947 }
 948
 949 #ifdef CONFIG_VHOST_SCSI
 950 static int vhost_ccw_scsi_init(VirtioCcwDevice *ccw_dev)
 951 {
 952     VHostSCSICcw *dev = VHOST_SCSI_CCW(ccw_dev);
 953     DeviceState *vdev = DEVICE(&dev->vdev);
 954
 955     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 956     if (qdev_init(vdev) < 0) {
 957         return -1;
 958     }
 959
 960     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 961 }
 962
 963 static void vhost_ccw_scsi_instance_init(Object *obj)
 964 {
 965     VHostSCSICcw *dev = VHOST_SCSI_CCW(obj);
 966
 967     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
 968                                 TYPE_VHOST_SCSI);
 969 }
 970 #endif
 971
 972 static int virtio_ccw_rng_init(VirtioCcwDevice *ccw_dev)
 973 {
 974     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(ccw_dev);
 975     DeviceState *vdev = DEVICE(&dev->vdev);
 976
 977     qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
 978     if (qdev_init(vdev) < 0) {
 979         return -1;
 980     }
 981
 982     object_property_set_link(OBJECT(dev),
 983                              OBJECT(dev->vdev.conf.rng), "rng",
 984                              NULL);
 985
 986     return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 987 }
 988
 989 /* DeviceState to VirtioCcwDevice. Note: used on datapath,
 990  * be careful and test performance if you change this.
 991  */
 992 static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d)
 993 {
 994     return container_of(d, VirtioCcwDevice, parent_obj);
 995 }
 996
 997 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc,
 998                                      uint8_t to_be_set)
 999 {
1000     uint8_t ind_old, ind_new;
1001     hwaddr len = 1;
1002     uint8_t *ind_addr;
1003
1004     ind_addr = cpu_physical_memory_map(ind_loc, &len, 1);
1005     if (!ind_addr) {
1006         error_report("%s(%x.%x.%04x): unable to access indicator",
1007                      __func__, sch->cssid, sch->ssid, sch->schid);
1008         return -1;
1009     }
1010     do {
1011         ind_old = *ind_addr;
1012         ind_new = ind_old | to_be_set;
1013     } while (atomic_cmpxchg(ind_addr, ind_old, ind_new) != ind_old);
1014     cpu_physical_memory_unmap(ind_addr, len, 1, len);
1015
1016     return ind_old;
1017 }
1018
1019 static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
1020 {
1021     VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d);
1022     SubchDev *sch = dev->sch;
1023     uint64_t indicators;
1024
1025     if (vector >= 128) {
1026         return;
1027     }
1028
1029     if (vector < VIRTIO_PCI_QUEUE_MAX) {
1030         if (!dev->indicators) {
1031             return;
1032         }
1033         if (sch->thinint_active) {
1034             /*
1035              * In the adapter interrupt case, indicators points to a
1036              * memory area that may be (way) larger than 64 bit and
1037              * ind_bit indicates the start of the indicators in a big
1038              * endian notation.
1039              */
1040             uint64_t ind_bit = dev->routes.adapter.ind_offset;
1041
1042             virtio_set_ind_atomic(sch, dev->indicators->addr +
1043                                   (ind_bit + vector) / 8,
1044                                   0x80 >> ((ind_bit + vector) % 8));
1045             if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr,
1046                                        0x01)) {
1047                 css_adapter_interrupt(dev->thinint_isc);
1048             }
1049         } else {
1050             indicators = ldq_phys(&address_space_memory, dev->indicators->addr);
1051             indicators |= 1ULL << vector;
1052             stq_phys(&address_space_memory, dev->indicators->addr, indicators);
1053             css_conditional_io_interrupt(sch);
1054         }
1055     } else {
1056         if (!dev->indicators2) {
1057             return;
1058         }
1059         vector = 0;
1060         indicators = ldq_phys(&address_space_memory, dev->indicators2->addr);
1061         indicators |= 1ULL << vector;
1062         stq_phys(&address_space_memory, dev->indicators2->addr, indicators);
1063         css_conditional_io_interrupt(sch);
1064     }
1065 }
1066
1067 static unsigned virtio_ccw_get_features(DeviceState *d)
1068 {
1069     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1070
1071     /* Only the first 32 feature bits are used. */
1072     return dev->host_features[0];
1073 }
1074
1075 static void virtio_ccw_reset(DeviceState *d)
1076 {
1077     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1078     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1079
1080     virtio_ccw_stop_ioeventfd(dev);
1081     virtio_reset(vdev);
1082     css_reset_sch(dev->sch);
1083     if (dev->indicators) {
1084         release_indicator(&dev->routes.adapter, dev->indicators);
1085         dev->indicators = NULL;
1086     }
1087     if (dev->indicators2) {
1088         release_indicator(&dev->routes.adapter, dev->indicators2);
1089         dev->indicators2 = NULL;
1090     }
1091     if (dev->summary_indicator) {
1092         release_indicator(&dev->routes.adapter, dev->summary_indicator);
1093         dev->summary_indicator = NULL;
1094     }
1095 }
1096
1097 static void virtio_ccw_vmstate_change(DeviceState *d, bool running)
1098 {
1099     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1100
1101     if (running) {
1102         virtio_ccw_start_ioeventfd(dev);
1103     } else {
1104         virtio_ccw_stop_ioeventfd(dev);
1105     }
1106 }
1107
1108 static bool virtio_ccw_query_guest_notifiers(DeviceState *d)
1109 {
1110     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1111
1112     return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA);
1113 }
1114
1115 static int virtio_ccw_set_host_notifier(DeviceState *d, int n, bool assign)
1116 {
1117     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1118
1119     /* Stop using the generic ioeventfd, we are doing eventfd handling
1120      * ourselves below */
1121     dev->ioeventfd_disabled = assign;
1122     if (assign) {
1123         virtio_ccw_stop_ioeventfd(dev);
1124     }
1125     return virtio_ccw_set_guest2host_notifier(dev, n, assign, false);
1126 }
1127
1128 static int virtio_ccw_get_mappings(VirtioCcwDevice *dev)
1129 {
1130     int r;
1131
1132     if (!dev->sch->thinint_active) {
1133         return -EINVAL;
1134     }
1135
1136     r = map_indicator(&dev->routes.adapter, dev->summary_indicator);
1137     if (r) {
1138         return r;
1139     }
1140     r = map_indicator(&dev->routes.adapter, dev->indicators);
1141     if (r) {
1142         return r;
1143     }
1144     dev->routes.adapter.summary_addr = dev->summary_indicator->map;
1145     dev->routes.adapter.ind_addr = dev->indicators->map;
1146
1147     return 0;
1148 }
1149
1150 static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs)
1151 {
1152     int i;
1153     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1154     int ret;
1155     S390FLICState *fs = s390_get_flic();
1156     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1157
1158     ret = virtio_ccw_get_mappings(dev);
1159     if (ret) {
1160         return ret;
1161     }
1162     for (i = 0; i < nvqs; i++) {
1163         if (!virtio_queue_get_num(vdev, i)) {
1164             break;
1165         }
1166     }
1167     dev->routes.num_routes = i;
1168     return fsc->add_adapter_routes(fs, &dev->routes);
1169 }
1170
1171 static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs)
1172 {
1173     S390FLICState *fs = s390_get_flic();
1174     S390FLICStateClass *fsc = S390_FLIC_COMMON_GET_CLASS(fs);
1175
1176     fsc->release_adapter_routes(fs, &dev->routes);
1177 }
1178
1179 static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n)
1180 {
1181     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1182     VirtQueue *vq = virtio_get_queue(vdev, n);
1183     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1184
1185     return kvm_irqchip_add_irqfd_notifier(kvm_state, notifier, NULL,
1186                                           dev->routes.gsi[n]);
1187 }
1188
1189 static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n)
1190 {
1191     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1192     VirtQueue *vq = virtio_get_queue(vdev, n);
1193     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1194     int ret;
1195
1196     ret = kvm_irqchip_remove_irqfd_notifier(kvm_state, notifier,
1197                                             dev->routes.gsi[n]);
1198     assert(ret == 0);
1199 }
1200
1201 static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n,
1202                                          bool assign, bool with_irqfd)
1203 {
1204     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1205     VirtQueue *vq = virtio_get_queue(vdev, n);
1206     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
1207     VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
1208
1209     if (assign) {
1210         int r = event_notifier_init(notifier, 0);
1211
1212         if (r < 0) {
1213             return r;
1214         }
1215         virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd);
1216         if (with_irqfd) {
1217             r = virtio_ccw_add_irqfd(dev, n);
1218             if (r) {
1219                 virtio_queue_set_guest_notifier_fd_handler(vq, false,
1220                                                            with_irqfd);
1221                 return r;
1222             }
1223         }
1224         /*
1225          * We do not support individual masking for channel devices, so we
1226          * need to manually trigger any guest masking callbacks here.
1227          */
1228         if (k->guest_notifier_mask) {
1229             k->guest_notifier_mask(vdev, n, false);
1230         }
1231         /* get lost events and re-inject */
1232         if (k->guest_notifier_pending &&
1233             k->guest_notifier_pending(vdev, n)) {
1234             event_notifier_set(notifier);
1235         }
1236     } else {
1237         if (k->guest_notifier_mask) {
1238             k->guest_notifier_mask(vdev, n, true);
1239         }
1240         if (with_irqfd) {
1241             virtio_ccw_remove_irqfd(dev, n);
1242         }
1243         virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd);
1244         event_notifier_cleanup(notifier);
1245     }
1246     return 0;
1247 }
1248
1249 static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs,
1250                                           bool assigned)
1251 {
1252     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1253     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1254     bool with_irqfd = dev->sch->thinint_active && kvm_irqfds_enabled();
1255     int r, n;
1256
1257     if (with_irqfd && assigned) {
1258         /* irq routes need to be set up before assigning irqfds */
1259         r = virtio_ccw_setup_irqroutes(dev, nvqs);
1260         if (r < 0) {
1261             goto irqroute_error;
1262         }
1263     }
1264     for (n = 0; n < nvqs; n++) {
1265         if (!virtio_queue_get_num(vdev, n)) {
1266             break;
1267         }
1268         r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd);
1269         if (r < 0) {
1270             goto assign_error;
1271         }
1272     }
1273     if (with_irqfd && !assigned) {
1274         /* release irq routes after irqfds have been released */
1275         virtio_ccw_release_irqroutes(dev, nvqs);
1276     }
1277     return 0;
1278
1279 assign_error:
1280     while (--n >= 0) {
1281         virtio_ccw_set_guest_notifier(dev, n, !assigned, false);
1282     }
1283 irqroute_error:
1284     if (with_irqfd && assigned) {
1285         virtio_ccw_release_irqroutes(dev, nvqs);
1286     }
1287     return r;
1288 }
1289
1290 static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f)
1291 {
1292     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1293     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1294
1295     qemu_put_be16(f, virtio_queue_vector(vdev, n));
1296 }
1297
1298 static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f)
1299 {
1300     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1301     VirtIODevice *vdev = virtio_bus_get_device(&dev->bus);
1302     uint16_t vector;
1303
1304     qemu_get_be16s(f, &vector);
1305     virtio_queue_set_vector(vdev, n , vector);
1306
1307     return 0;
1308 }
1309
1310 static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f)
1311 {
1312     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1313     SubchDev *s = dev->sch;
1314
1315     subch_device_save(s, f);
1316     if (dev->indicators != NULL) {
1317         qemu_put_be32(f, dev->indicators->len);
1318         qemu_put_be64(f, dev->indicators->addr);
1319     } else {
1320         qemu_put_be32(f, 0);
1321         qemu_put_be64(f, 0UL);
1322     }
1323     if (dev->indicators2 != NULL) {
1324         qemu_put_be32(f, dev->indicators2->len);
1325         qemu_put_be64(f, dev->indicators2->addr);
1326     } else {
1327         qemu_put_be32(f, 0);
1328         qemu_put_be64(f, 0UL);
1329     }
1330     if (dev->summary_indicator != NULL) {
1331         qemu_put_be32(f, dev->summary_indicator->len);
1332         qemu_put_be64(f, dev->summary_indicator->addr);
1333     } else {
1334         qemu_put_be32(f, 0);
1335         qemu_put_be64(f, 0UL);
1336     }
1337     qemu_put_be64(f, dev->routes.adapter.ind_offset);
1338     qemu_put_byte(f, dev->thinint_isc);
1339 }
1340
1341 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f)
1342 {
1343     VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d);
1344     SubchDev *s = dev->sch;
1345     int len;
1346
1347     s->driver_data = dev;
1348     subch_device_load(s, f);
1349     len = qemu_get_be32(f);
1350     if (len != 0) {
1351         dev->indicators = get_indicator(qemu_get_be64(f), len);
1352     } else {
1353         qemu_get_be64(f);
1354         dev->indicators = NULL;
1355     }
1356     len = qemu_get_be32(f);
1357     if (len != 0) {
1358         dev->indicators2 = get_indicator(qemu_get_be64(f), len);
1359     } else {
1360         qemu_get_be64(f);
1361         dev->indicators2 = NULL;
1362     }
1363     len = qemu_get_be32(f);
1364     if (len != 0) {
1365         dev->summary_indicator = get_indicator(qemu_get_be64(f), len);
1366     } else {
1367         qemu_get_be64(f);
1368         dev->summary_indicator = NULL;
1369     }
1370     dev->routes.adapter.ind_offset = qemu_get_be64(f);
1371     dev->thinint_isc = qemu_get_byte(f);
1372     if (s->thinint_active) {
1373         return css_register_io_adapter(CSS_IO_ADAPTER_VIRTIO,
1374                                        dev->thinint_isc, true, false,
1375                                        &dev->routes.adapter.adapter_id);
1376     }
1377
1378     return 0;
1379 }
1380
1381 /**************** Virtio-ccw Bus Device Descriptions *******************/
1382
1383 static Property virtio_ccw_net_properties[] = {
1384     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1385     DEFINE_VIRTIO_NET_FEATURES(VirtioCcwDevice, host_features[0]),
1386     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1387                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1388     DEFINE_PROP_END_OF_LIST(),
1389 };
1390
1391 static void virtio_ccw_net_class_init(ObjectClass *klass, void *data)
1392 {
1393     DeviceClass *dc = DEVICE_CLASS(klass);
1394     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1395
1396     k->init = virtio_ccw_net_init;
1397     k->exit = virtio_ccw_exit;
1398     dc->reset = virtio_ccw_reset;
1399     dc->props = virtio_ccw_net_properties;
1400 }
1401
1402 static const TypeInfo virtio_ccw_net = {
1403     .name          = TYPE_VIRTIO_NET_CCW,
1404     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1405     .instance_size = sizeof(VirtIONetCcw),
1406     .instance_init = virtio_ccw_net_instance_init,
1407     .class_init    = virtio_ccw_net_class_init,
1408 };
1409
1410 static Property virtio_ccw_blk_properties[] = {
1411     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1412     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1413                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1414     DEFINE_PROP_END_OF_LIST(),
1415 };
1416
1417 static void virtio_ccw_blk_class_init(ObjectClass *klass, void *data)
1418 {
1419     DeviceClass *dc = DEVICE_CLASS(klass);
1420     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1421
1422     k->init = virtio_ccw_blk_init;
1423     k->exit = virtio_ccw_exit;
1424     dc->reset = virtio_ccw_reset;
1425     dc->props = virtio_ccw_blk_properties;
1426 }
1427
1428 static const TypeInfo virtio_ccw_blk = {
1429     .name          = TYPE_VIRTIO_BLK_CCW,
1430     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1431     .instance_size = sizeof(VirtIOBlkCcw),
1432     .instance_init = virtio_ccw_blk_instance_init,
1433     .class_init    = virtio_ccw_blk_class_init,
1434 };
1435
1436 static Property virtio_ccw_serial_properties[] = {
1437     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1438     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1439                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1440     DEFINE_PROP_END_OF_LIST(),
1441 };
1442
1443 static void virtio_ccw_serial_class_init(ObjectClass *klass, void *data)
1444 {
1445     DeviceClass *dc = DEVICE_CLASS(klass);
1446     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1447
1448     k->init = virtio_ccw_serial_init;
1449     k->exit = virtio_ccw_exit;
1450     dc->reset = virtio_ccw_reset;
1451     dc->props = virtio_ccw_serial_properties;
1452 }
1453
1454 static const TypeInfo virtio_ccw_serial = {
1455     .name          = TYPE_VIRTIO_SERIAL_CCW,
1456     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1457     .instance_size = sizeof(VirtioSerialCcw),
1458     .instance_init = virtio_ccw_serial_instance_init,
1459     .class_init    = virtio_ccw_serial_class_init,
1460 };
1461
1462 static Property virtio_ccw_balloon_properties[] = {
1463     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1464     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1465                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1466     DEFINE_PROP_END_OF_LIST(),
1467 };
1468
1469 static void virtio_ccw_balloon_class_init(ObjectClass *klass, void *data)
1470 {
1471     DeviceClass *dc = DEVICE_CLASS(klass);
1472     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1473
1474     k->init = virtio_ccw_balloon_init;
1475     k->exit = virtio_ccw_exit;
1476     dc->reset = virtio_ccw_reset;
1477     dc->props = virtio_ccw_balloon_properties;
1478 }
1479
1480 static const TypeInfo virtio_ccw_balloon = {
1481     .name          = TYPE_VIRTIO_BALLOON_CCW,
1482     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1483     .instance_size = sizeof(VirtIOBalloonCcw),
1484     .instance_init = virtio_ccw_balloon_instance_init,
1485     .class_init    = virtio_ccw_balloon_class_init,
1486 };
1487
1488 static Property virtio_ccw_scsi_properties[] = {
1489     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1490     DEFINE_VIRTIO_SCSI_FEATURES(VirtioCcwDevice, host_features[0]),
1491     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1492                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1493     DEFINE_PROP_END_OF_LIST(),
1494 };
1495
1496 static void virtio_ccw_scsi_class_init(ObjectClass *klass, void *data)
1497 {
1498     DeviceClass *dc = DEVICE_CLASS(klass);
1499     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1500
1501     k->init = virtio_ccw_scsi_init;
1502     k->exit = virtio_ccw_exit;
1503     dc->reset = virtio_ccw_reset;
1504     dc->props = virtio_ccw_scsi_properties;
1505 }
1506
1507 static const TypeInfo virtio_ccw_scsi = {
1508     .name          = TYPE_VIRTIO_SCSI_CCW,
1509     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1510     .instance_size = sizeof(VirtIOSCSICcw),
1511     .instance_init = virtio_ccw_scsi_instance_init,
1512     .class_init    = virtio_ccw_scsi_class_init,
1513 };
1514
1515 #ifdef CONFIG_VHOST_SCSI
1516 static Property vhost_ccw_scsi_properties[] = {
1517     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1518     DEFINE_PROP_END_OF_LIST(),
1519 };
1520
1521 static void vhost_ccw_scsi_class_init(ObjectClass *klass, void *data)
1522 {
1523     DeviceClass *dc = DEVICE_CLASS(klass);
1524     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1525
1526     k->init = vhost_ccw_scsi_init;
1527     k->exit = virtio_ccw_exit;
1528     dc->reset = virtio_ccw_reset;
1529     dc->props = vhost_ccw_scsi_properties;
1530 }
1531
1532 static const TypeInfo vhost_ccw_scsi = {
1533     .name          = TYPE_VHOST_SCSI_CCW,
1534     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1535     .instance_size = sizeof(VHostSCSICcw),
1536     .instance_init = vhost_ccw_scsi_instance_init,
1537     .class_init    = vhost_ccw_scsi_class_init,
1538 };
1539 #endif
1540
1541 static void virtio_ccw_rng_instance_init(Object *obj)
1542 {
1543     VirtIORNGCcw *dev = VIRTIO_RNG_CCW(obj);
1544
1545     virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
1546                                 TYPE_VIRTIO_RNG);
1547     object_property_add_link(obj, "rng", TYPE_RNG_BACKEND,
1548                              (Object **)&dev->vdev.conf.rng,
1549                              qdev_prop_allow_set_link_before_realize,
1550                              OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
1551 }
1552
1553 static Property virtio_ccw_rng_properties[] = {
1554     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
1555     DEFINE_PROP_BIT("ioeventfd", VirtioCcwDevice, flags,
1556                     VIRTIO_CCW_FLAG_USE_IOEVENTFD_BIT, true),
1557     DEFINE_PROP_END_OF_LIST(),
1558 };
1559
1560 static void virtio_ccw_rng_class_init(ObjectClass *klass, void *data)
1561 {
1562     DeviceClass *dc = DEVICE_CLASS(klass);
1563     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
1564
1565     k->init = virtio_ccw_rng_init;
1566     k->exit = virtio_ccw_exit;
1567     dc->reset = virtio_ccw_reset;
1568     dc->props = virtio_ccw_rng_properties;
1569 }
1570
1571 static const TypeInfo virtio_ccw_rng = {
1572     .name          = TYPE_VIRTIO_RNG_CCW,
1573     .parent        = TYPE_VIRTIO_CCW_DEVICE,
1574     .instance_size = sizeof(VirtIORNGCcw),
1575     .instance_init = virtio_ccw_rng_instance_init,
1576     .class_init    = virtio_ccw_rng_class_init,
1577 };
1578
1579 static int virtio_ccw_busdev_init(DeviceState *dev)
1580 {
1581     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1582     VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
1583
1584     virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev);
1585
1586     return _info->init(_dev);
1587 }
1588
1589 static int virtio_ccw_busdev_exit(DeviceState *dev)
1590 {
1591     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1592     VirtIOCCWDeviceClass *_info = VIRTIO_CCW_DEVICE_GET_CLASS(dev);
1593
1594     return _info->exit(_dev);
1595 }
1596
1597 static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev,
1598                                      DeviceState *dev, Error **errp)
1599 {
1600     VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev;
1601     SubchDev *sch = _dev->sch;
1602
1603     virtio_ccw_stop_ioeventfd(_dev);
1604
1605     /*
1606      * We should arrive here only for device_del, since we don't support
1607      * direct hot(un)plug of channels, but only through virtio.
1608      */
1609     assert(sch != NULL);
1610     /* Subchannel is now disabled and no longer valid. */
1611     sch->curr_status.pmcw.flags &= ~(PMCW_FLAGS_MASK_ENA |
1612                                      PMCW_FLAGS_MASK_DNV);
1613
1614     css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1, 0);
1615
1616     object_unparent(OBJECT(dev));
1617 }
1618
1619 static Property virtio_ccw_properties[] = {
1620     DEFINE_VIRTIO_COMMON_FEATURES(VirtioCcwDevice, host_features[0]),
1621     DEFINE_PROP_END_OF_LIST(),
1622 };
1623
1624 static void virtio_ccw_device_class_init(ObjectClass *klass, void *data)
1625 {
1626     DeviceClass *dc = DEVICE_CLASS(klass);
1627
1628     dc->props = virtio_ccw_properties;
1629     dc->init = virtio_ccw_busdev_init;
1630     dc->exit = virtio_ccw_busdev_exit;
1631     dc->bus_type = TYPE_VIRTUAL_CSS_BUS;
1632 }
1633
1634 static const TypeInfo virtio_ccw_device_info = {
1635     .name = TYPE_VIRTIO_CCW_DEVICE,
1636     .parent = TYPE_DEVICE,
1637     .instance_size = sizeof(VirtioCcwDevice),
1638     .class_init = virtio_ccw_device_class_init,
1639     .class_size = sizeof(VirtIOCCWDeviceClass),
1640     .abstract = true,
1641 };
1642
1643 /***************** Virtual-css Bus Bridge Device ********************/
1644 /* Only required to have the virtio bus as child in the system bus */
1645
1646 static int virtual_css_bridge_init(SysBusDevice *dev)
1647 {
1648     /* nothing */
1649     return 0;
1650 }
1651
1652 static void virtual_css_bridge_class_init(ObjectClass *klass, void *data)
1653 {
1654     SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
1655     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(klass);
1656
1657     k->init = virtual_css_bridge_init;
1658     hc->unplug = virtio_ccw_busdev_unplug;
1659 }
1660
1661 static const TypeInfo virtual_css_bridge_info = {
1662     .name          = "virtual-css-bridge",
1663     .parent        = TYPE_SYS_BUS_DEVICE,
1664     .instance_size = sizeof(SysBusDevice),
1665     .class_init    = virtual_css_bridge_class_init,
1666     .interfaces = (InterfaceInfo[]) {
1667         { TYPE_HOTPLUG_HANDLER },
1668         { }
1669     }
1670 };
1671
1672 /* virtio-ccw-bus */
1673
1674 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size,
1675                                VirtioCcwDevice *dev)
1676 {
1677     DeviceState *qdev = DEVICE(dev);
1678     char virtio_bus_name[] = "virtio-bus";
1679
1680     qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_CCW_BUS,
1681                         qdev, virtio_bus_name);
1682 }
1683
1684 static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data)
1685 {
1686     VirtioBusClass *k = VIRTIO_BUS_CLASS(klass);
1687     BusClass *bus_class = BUS_CLASS(klass);
1688
1689     bus_class->max_dev = 1;
1690     k->notify = virtio_ccw_notify;
1691     k->get_features = virtio_ccw_get_features;
1692     k->vmstate_change = virtio_ccw_vmstate_change;
1693     k->query_guest_notifiers = virtio_ccw_query_guest_notifiers;
1694     k->set_host_notifier = virtio_ccw_set_host_notifier;
1695     k->set_guest_notifiers = virtio_ccw_set_guest_notifiers;
1696     k->save_queue = virtio_ccw_save_queue;
1697     k->load_queue = virtio_ccw_load_queue;
1698     k->save_config = virtio_ccw_save_config;
1699     k->load_config = virtio_ccw_load_config;
1700 }
1701
1702 static const TypeInfo virtio_ccw_bus_info = {
1703     .name = TYPE_VIRTIO_CCW_BUS,
1704     .parent = TYPE_VIRTIO_BUS,
1705     .instance_size = sizeof(VirtioCcwBusState),
1706     .class_init = virtio_ccw_bus_class_init,
1707 };
1708
1709 static void virtio_ccw_register(void)
1710 {
1711     type_register_static(&virtio_ccw_bus_info);
1712     type_register_static(&virtual_css_bus_info);
1713     type_register_static(&virtio_ccw_device_info);
1714     type_register_static(&virtio_ccw_serial);
1715     type_register_static(&virtio_ccw_blk);
1716     type_register_static(&virtio_ccw_net);
1717     type_register_static(&virtio_ccw_balloon);
1718     type_register_static(&virtio_ccw_scsi);
1719 #ifdef CONFIG_VHOST_SCSI
1720     type_register_static(&vhost_ccw_scsi);
1721 #endif
1722     type_register_static(&virtio_ccw_rng);
1723     type_register_static(&virtual_css_bridge_info);
1724 }
1725
1726 type_init(virtio_ccw_register)