hw/vfio/ccw.c

   1 /*
   2  * vfio based subchannel assignment support
   3  *
   4  * Copyright 2017 IBM Corp.
   5  * Copyright 2019 Red Hat, Inc.
   6  *
   7  * Author(s): Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
   8  *            Xiao Feng Ren <renxiaof@linux.vnet.ibm.com>
   9  *            Pierre Morel <pmorel@linux.vnet.ibm.com>
  10  *            Cornelia Huck <cohuck@redhat.com>
  11  *
  12  * This work is licensed under the terms of the GNU GPL, version 2 or (at
  13  * your option) any later version. See the COPYING file in the top-level
  14  * directory.
  15  */
  16
  17 #include "qemu/osdep.h"
  18 #include <linux/vfio.h>
  19 #include <linux/vfio_ccw.h>
  20 #include <sys/ioctl.h>
  21
  22 #include "qapi/error.h"
  23 #include "hw/sysbus.h"
  24 #include "hw/vfio/vfio.h"
  25 #include "hw/vfio/vfio-common.h"
  26 #include "hw/s390x/s390-ccw.h"
  27 #include "hw/s390x/vfio-ccw.h"
  28 #include "hw/s390x/ccw-device.h"
  29 #include "exec/address-spaces.h"
  30 #include "qemu/error-report.h"
  31 #include "qemu/module.h"
  32
  33 struct VFIOCCWDevice {
  34     S390CCWDevice cdev;
  35     VFIODevice vdev;
  36     uint64_t io_region_size;
  37     uint64_t io_region_offset;
  38     struct ccw_io_region *io_region;
  39     uint64_t async_cmd_region_size;
  40     uint64_t async_cmd_region_offset;
  41     struct ccw_cmd_region *async_cmd_region;
  42     EventNotifier io_notifier;
  43     bool force_orb_pfch;
  44     bool warned_orb_pfch;
  45 };
  46
  47 static inline void warn_once_pfch(VFIOCCWDevice *vcdev, SubchDev *sch,
  48                                   const char *msg)
  49 {
  50     warn_report_once_cond(&vcdev->warned_orb_pfch,
  51                           "vfio-ccw (devno %x.%x.%04x): %s",
  52                           sch->cssid, sch->ssid, sch->devno, msg);
  53 }
  54
  55 static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
  56 {
  57     vdev->needs_reset = false;
  58 }
  59
  60 /*
  61  * We don't need vfio_hot_reset_multi and vfio_eoi operations for
  62  * vfio_ccw device now.
  63  */
  64 struct VFIODeviceOps vfio_ccw_ops = {
  65     .vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
  66 };
  67
  68 static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
  69 {
  70     S390CCWDevice *cdev = sch->driver_data;
  71     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
  72     struct ccw_io_region *region = vcdev->io_region;
  73     int ret;
  74
  75     if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH)) {
  76         if (!(vcdev->force_orb_pfch)) {
  77             warn_once_pfch(vcdev, sch, "requires PFCH flag set");
  78             sch_gen_unit_exception(sch);
  79             css_inject_io_interrupt(sch);
  80             return IOINST_CC_EXPECTED;
  81         } else {
  82             sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
  83             warn_once_pfch(vcdev, sch, "PFCH flag forced");
  84         }
  85     }
  86
  87     QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));
  88     QEMU_BUILD_BUG_ON(sizeof(region->scsw_area) != sizeof(SCSW));
  89     QEMU_BUILD_BUG_ON(sizeof(region->irb_area) != sizeof(IRB));
  90
  91     memset(region, 0, sizeof(*region));
  92
  93     memcpy(region->orb_area, &sch->orb, sizeof(ORB));
  94     memcpy(region->scsw_area, &sch->curr_status.scsw, sizeof(SCSW));
  95
  96 again:
  97     ret = pwrite(vcdev->vdev.fd, region,
  98                  vcdev->io_region_size, vcdev->io_region_offset);
  99     if (ret != vcdev->io_region_size) {
 100         if (errno == EAGAIN) {
 101             goto again;
 102         }
 103         error_report("vfio-ccw: wirte I/O region failed with errno=%d", errno);
 104         ret = -errno;
 105     } else {
 106         ret = region->ret_code;
 107     }
 108     switch (ret) {
 109     case 0:
 110         return IOINST_CC_EXPECTED;
 111     case -EBUSY:
 112         return IOINST_CC_BUSY;
 113     case -ENODEV:
 114     case -EACCES:
 115         return IOINST_CC_NOT_OPERATIONAL;
 116     case -EFAULT:
 117     default:
 118         sch_gen_unit_exception(sch);
 119         css_inject_io_interrupt(sch);
 120         return IOINST_CC_EXPECTED;
 121     }
 122 }
 123
 124 static int vfio_ccw_handle_clear(SubchDev *sch)
 125 {
 126     S390CCWDevice *cdev = sch->driver_data;
 127     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 128     struct ccw_cmd_region *region = vcdev->async_cmd_region;
 129     int ret;
 130
 131     if (!vcdev->async_cmd_region) {
 132         /* Async command region not available, fall back to emulation */
 133         return -ENOSYS;
 134     }
 135
 136     memset(region, 0, sizeof(*region));
 137     region->command = VFIO_CCW_ASYNC_CMD_CSCH;
 138
 139 again:
 140     ret = pwrite(vcdev->vdev.fd, region,
 141                  vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
 142     if (ret != vcdev->async_cmd_region_size) {
 143         if (errno == EAGAIN) {
 144             goto again;
 145         }
 146         error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
 147         ret = -errno;
 148     } else {
 149         ret = region->ret_code;
 150     }
 151     switch (ret) {
 152     case 0:
 153     case -ENODEV:
 154     case -EACCES:
 155         return 0;
 156     case -EFAULT:
 157     default:
 158         sch_gen_unit_exception(sch);
 159         css_inject_io_interrupt(sch);
 160         return 0;
 161     }
 162 }
 163
 164 static int vfio_ccw_handle_halt(SubchDev *sch)
 165 {
 166     S390CCWDevice *cdev = sch->driver_data;
 167     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 168     struct ccw_cmd_region *region = vcdev->async_cmd_region;
 169     int ret;
 170
 171     if (!vcdev->async_cmd_region) {
 172         /* Async command region not available, fall back to emulation */
 173         return -ENOSYS;
 174     }
 175
 176     memset(region, 0, sizeof(*region));
 177     region->command = VFIO_CCW_ASYNC_CMD_HSCH;
 178
 179 again:
 180     ret = pwrite(vcdev->vdev.fd, region,
 181                  vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
 182     if (ret != vcdev->async_cmd_region_size) {
 183         if (errno == EAGAIN) {
 184             goto again;
 185         }
 186         error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
 187         ret = -errno;
 188     } else {
 189         ret = region->ret_code;
 190     }
 191     switch (ret) {
 192     case 0:
 193     case -EBUSY:
 194     case -ENODEV:
 195     case -EACCES:
 196         return 0;
 197     case -EFAULT:
 198     default:
 199         sch_gen_unit_exception(sch);
 200         css_inject_io_interrupt(sch);
 201         return 0;
 202     }
 203 }
 204
 205 static void vfio_ccw_reset(DeviceState *dev)
 206 {
 207     CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
 208     S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
 209     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 210
 211     ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
 212 }
 213
 214 static void vfio_ccw_io_notifier_handler(void *opaque)
 215 {
 216     VFIOCCWDevice *vcdev = opaque;
 217     struct ccw_io_region *region = vcdev->io_region;
 218     S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev);
 219     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 220     SubchDev *sch = ccw_dev->sch;
 221     SCHIB *schib = &sch->curr_status;
 222     SCSW s;
 223     IRB irb;
 224     int size;
 225
 226     if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
 227         return;
 228     }
 229
 230     size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
 231                  vcdev->io_region_offset);
 232     if (size == -1) {
 233         switch (errno) {
 234         case ENODEV:
 235             /* Generate a deferred cc 3 condition. */
 236             schib->scsw.flags |= SCSW_FLAGS_MASK_CC;
 237             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 238             schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
 239             goto read_err;
 240         case EFAULT:
 241             /* Memory problem, generate channel data check. */
 242             schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 243             schib->scsw.cstat = SCSW_CSTAT_DATA_CHECK;
 244             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 245             schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
 246                        SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
 247             goto read_err;
 248         default:
 249             /* Error, generate channel program check. */
 250             schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 251             schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK;
 252             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 253             schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
 254                        SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
 255             goto read_err;
 256         }
 257     } else if (size != vcdev->io_region_size) {
 258         /* Information transfer error, generate channel-control check. */
 259         schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 260         schib->scsw.cstat = SCSW_CSTAT_CHN_CTRL_CHK;
 261         schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 262         schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
 263                    SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
 264         goto read_err;
 265     }
 266
 267     memcpy(&irb, region->irb_area, sizeof(IRB));
 268
 269     /* Update control block via irb. */
 270     s = schib->scsw;
 271     copy_scsw_to_guest(&s, &irb.scsw);
 272     schib->scsw = s;
 273
 274     /* If a uint check is pending, copy sense data. */
 275     if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
 276         (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
 277         memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
 278     }
 279
 280 read_err:
 281     css_inject_io_interrupt(sch);
 282 }
 283
 284 static void vfio_ccw_register_io_notifier(VFIOCCWDevice *vcdev, Error **errp)
 285 {
 286     VFIODevice *vdev = &vcdev->vdev;
 287     struct vfio_irq_info *irq_info;
 288     size_t argsz;
 289     int fd;
 290
 291     if (vdev->num_irqs < VFIO_CCW_IO_IRQ_INDEX + 1) {
 292         error_setg(errp, "vfio: unexpected number of io irqs %u",
 293                    vdev->num_irqs);
 294         return;
 295     }
 296
 297     argsz = sizeof(*irq_info);
 298     irq_info = g_malloc0(argsz);
 299     irq_info->index = VFIO_CCW_IO_IRQ_INDEX;
 300     irq_info->argsz = argsz;
 301     if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
 302               irq_info) < 0 || irq_info->count < 1) {
 303         error_setg_errno(errp, errno, "vfio: Error getting irq info");
 304         goto out_free_info;
 305     }
 306
 307     if (event_notifier_init(&vcdev->io_notifier, 0)) {
 308         error_setg_errno(errp, errno,
 309                          "vfio: Unable to init event notifier for IO");
 310         goto out_free_info;
 311     }
 312
 313     fd = event_notifier_get_fd(&vcdev->io_notifier);
 314     qemu_set_fd_handler(fd, vfio_ccw_io_notifier_handler, NULL, vcdev);
 315
 316     if (vfio_set_irq_signaling(vdev, VFIO_CCW_IO_IRQ_INDEX, 0,
 317                                VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
 318         qemu_set_fd_handler(fd, NULL, NULL, vcdev);
 319         event_notifier_cleanup(&vcdev->io_notifier);
 320     }
 321
 322 out_free_info:
 323     g_free(irq_info);
 324 }
 325
 326 static void vfio_ccw_unregister_io_notifier(VFIOCCWDevice *vcdev)
 327 {
 328     Error *err = NULL;
 329
 330     vfio_set_irq_signaling(&vcdev->vdev, VFIO_CCW_IO_IRQ_INDEX, 0,
 331                            VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err);
 332     if (err) {
 333         error_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
 334     }
 335
 336     qemu_set_fd_handler(event_notifier_get_fd(&vcdev->io_notifier),
 337                         NULL, NULL, vcdev);
 338     event_notifier_cleanup(&vcdev->io_notifier);
 339 }
 340
 341 static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
 342 {
 343     VFIODevice *vdev = &vcdev->vdev;
 344     struct vfio_region_info *info;
 345     int ret;
 346
 347     /* Sanity check device */
 348     if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
 349         error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
 350         return;
 351     }
 352
 353     /*
 354      * We always expect at least the I/O region to be present. We also
 355      * may have a variable number of regions governed by capabilities.
 356      */
 357     if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
 358         error_setg(errp, "vfio: too few regions (%u), expected at least %u",
 359                    vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1);
 360         return;
 361     }
 362
 363     ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
 364     if (ret) {
 365         error_setg_errno(errp, -ret, "vfio: Error getting config info");
 366         return;
 367     }
 368
 369     vcdev->io_region_size = info->size;
 370     if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
 371         error_setg(errp, "vfio: Unexpected size of the I/O region");
 372         g_free(info);
 373         return;
 374     }
 375
 376     vcdev->io_region_offset = info->offset;
 377     vcdev->io_region = g_malloc0(info->size);
 378
 379     /* check for the optional async command region */
 380     ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
 381                                    VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD, &info);
 382     if (!ret) {
 383         vcdev->async_cmd_region_size = info->size;
 384         if (sizeof(*vcdev->async_cmd_region) != vcdev->async_cmd_region_size) {
 385             error_setg(errp, "vfio: Unexpected size of the async cmd region");
 386             g_free(vcdev->io_region);
 387             g_free(info);
 388             return;
 389         }
 390         vcdev->async_cmd_region_offset = info->offset;
 391         vcdev->async_cmd_region = g_malloc0(info->size);
 392     }
 393
 394     g_free(info);
 395 }
 396
 397 static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
 398 {
 399     g_free(vcdev->async_cmd_region);
 400     g_free(vcdev->io_region);
 401 }
 402
 403 static void vfio_ccw_put_device(VFIOCCWDevice *vcdev)
 404 {
 405     g_free(vcdev->vdev.name);
 406     vfio_put_base_device(&vcdev->vdev);
 407 }
 408
 409 static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
 410                                 Error **errp)
 411 {
 412     char *name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
 413                                  vcdev->cdev.hostid.ssid,
 414                                  vcdev->cdev.hostid.devid);
 415     VFIODevice *vbasedev;
 416
 417     QLIST_FOREACH(vbasedev, &group->device_list, next) {
 418         if (strcmp(vbasedev->name, name) == 0) {
 419             error_setg(errp, "vfio: subchannel %s has already been attached",
 420                        name);
 421             goto out_err;
 422         }
 423     }
 424
 425     /*
 426      * All vfio-ccw devices are believed to operate in a way compatible with
 427      * memory ballooning, ie. pages pinned in the host are in the current
 428      * working set of the guest driver and therefore never overlap with pages
 429      * available to the guest balloon driver.  This needs to be set before
 430      * vfio_get_device() for vfio common to handle the balloon inhibitor.
 431      */
 432     vcdev->vdev.balloon_allowed = true;
 433
 434     if (vfio_get_device(group, vcdev->cdev.mdevid, &vcdev->vdev, errp)) {
 435         goto out_err;
 436     }
 437
 438     vcdev->vdev.ops = &vfio_ccw_ops;
 439     vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
 440     vcdev->vdev.name = name;
 441     vcdev->vdev.dev = &vcdev->cdev.parent_obj.parent_obj;
 442
 443     return;
 444
 445 out_err:
 446     g_free(name);
 447 }
 448
 449 static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
 450 {
 451     char *tmp, group_path[PATH_MAX];
 452     ssize_t len;
 453     int groupid;
 454
 455     tmp = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s/iommu_group",
 456                           cdev->hostid.cssid, cdev->hostid.ssid,
 457                           cdev->hostid.devid, cdev->mdevid);
 458     len = readlink(tmp, group_path, sizeof(group_path));
 459     g_free(tmp);
 460
 461     if (len <= 0 || len >= sizeof(group_path)) {
 462         error_setg(errp, "vfio: no iommu_group found");
 463         return NULL;
 464     }
 465
 466     group_path[len] = 0;
 467
 468     if (sscanf(basename(group_path), "%d", &groupid) != 1) {
 469         error_setg(errp, "vfio: failed to read %s", group_path);
 470         return NULL;
 471     }
 472
 473     return vfio_get_group(groupid, &address_space_memory, errp);
 474 }
 475
 476 static void vfio_ccw_realize(DeviceState *dev, Error **errp)
 477 {
 478     VFIOGroup *group;
 479     CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
 480     S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
 481     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 482     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
 483     Error *err = NULL;
 484
 485     /* Call the class init function for subchannel. */
 486     if (cdc->realize) {
 487         cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
 488         if (err) {
 489             goto out_err_propagate;
 490         }
 491     }
 492
 493     group = vfio_ccw_get_group(cdev, &err);
 494     if (!group) {
 495         goto out_group_err;
 496     }
 497
 498     vfio_ccw_get_device(group, vcdev, &err);
 499     if (err) {
 500         goto out_device_err;
 501     }
 502
 503     vfio_ccw_get_region(vcdev, &err);
 504     if (err) {
 505         goto out_region_err;
 506     }
 507
 508     vfio_ccw_register_io_notifier(vcdev, &err);
 509     if (err) {
 510         goto out_notifier_err;
 511     }
 512
 513     return;
 514
 515 out_notifier_err:
 516     vfio_ccw_put_region(vcdev);
 517 out_region_err:
 518     vfio_ccw_put_device(vcdev);
 519 out_device_err:
 520     vfio_put_group(group);
 521 out_group_err:
 522     if (cdc->unrealize) {
 523         cdc->unrealize(cdev, NULL);
 524     }
 525 out_err_propagate:
 526     error_propagate(errp, err);
 527 }
 528
 529 static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
 530 {
 531     CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
 532     S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
 533     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 534     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
 535     VFIOGroup *group = vcdev->vdev.group;
 536
 537     vfio_ccw_unregister_io_notifier(vcdev);
 538     vfio_ccw_put_region(vcdev);
 539     vfio_ccw_put_device(vcdev);
 540     vfio_put_group(group);
 541
 542     if (cdc->unrealize) {
 543         cdc->unrealize(cdev, errp);
 544     }
 545 }
 546
 547 static Property vfio_ccw_properties[] = {
 548     DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
 549     DEFINE_PROP_BOOL("force-orb-pfch", VFIOCCWDevice, force_orb_pfch, false),
 550     DEFINE_PROP_END_OF_LIST(),
 551 };
 552
 553 static const VMStateDescription vfio_ccw_vmstate = {
 554     .name = "vfio-ccw",
 555     .unmigratable = 1,
 556 };
 557
 558 static void vfio_ccw_class_init(ObjectClass *klass, void *data)
 559 {
 560     DeviceClass *dc = DEVICE_CLASS(klass);
 561     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 562
 563     dc->props = vfio_ccw_properties;
 564     dc->vmsd = &vfio_ccw_vmstate;
 565     dc->desc = "VFIO-based subchannel assignment";
 566     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 567     dc->realize = vfio_ccw_realize;
 568     dc->unrealize = vfio_ccw_unrealize;
 569     dc->reset = vfio_ccw_reset;
 570
 571     cdc->handle_request = vfio_ccw_handle_request;
 572     cdc->handle_halt = vfio_ccw_handle_halt;
 573     cdc->handle_clear = vfio_ccw_handle_clear;
 574 }
 575
 576 static const TypeInfo vfio_ccw_info = {
 577     .name = TYPE_VFIO_CCW,
 578     .parent = TYPE_S390_CCW,
 579     .instance_size = sizeof(VFIOCCWDevice),
 580     .class_init = vfio_ccw_class_init,
 581 };
 582
 583 static void register_vfio_ccw_type(void)
 584 {
 585     type_register_static(&vfio_ccw_info);
 586 }
 587
 588 type_init(register_vfio_ccw_type)