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/qdev-properties.h"
  29 #include "hw/s390x/ccw-device.h"
  30 #include "exec/address-spaces.h"
  31 #include "qemu/error-report.h"
  32 #include "qemu/main-loop.h"
  33 #include "qemu/module.h"
  34
  35 struct VFIOCCWDevice {
  36     S390CCWDevice cdev;
  37     VFIODevice vdev;
  38     uint64_t io_region_size;
  39     uint64_t io_region_offset;
  40     struct ccw_io_region *io_region;
  41     uint64_t async_cmd_region_size;
  42     uint64_t async_cmd_region_offset;
  43     struct ccw_cmd_region *async_cmd_region;
  44     uint64_t schib_region_size;
  45     uint64_t schib_region_offset;
  46     struct ccw_schib_region *schib_region;
  47     EventNotifier io_notifier;
  48     bool force_orb_pfch;
  49     bool warned_orb_pfch;
  50 };
  51
  52 static inline void warn_once_pfch(VFIOCCWDevice *vcdev, SubchDev *sch,
  53                                   const char *msg)
  54 {
  55     warn_report_once_cond(&vcdev->warned_orb_pfch,
  56                           "vfio-ccw (devno %x.%x.%04x): %s",
  57                           sch->cssid, sch->ssid, sch->devno, msg);
  58 }
  59
  60 static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
  61 {
  62     vdev->needs_reset = false;
  63 }
  64
  65 /*
  66  * We don't need vfio_hot_reset_multi and vfio_eoi operations for
  67  * vfio_ccw device now.
  68  */
  69 struct VFIODeviceOps vfio_ccw_ops = {
  70     .vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
  71 };
  72
  73 static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
  74 {
  75     S390CCWDevice *cdev = sch->driver_data;
  76     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
  77     struct ccw_io_region *region = vcdev->io_region;
  78     int ret;
  79
  80     if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH) && vcdev->force_orb_pfch) {
  81         sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
  82         warn_once_pfch(vcdev, sch, "PFCH flag forced");
  83     }
  84
  85     QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));
  86     QEMU_BUILD_BUG_ON(sizeof(region->scsw_area) != sizeof(SCSW));
  87     QEMU_BUILD_BUG_ON(sizeof(region->irb_area) != sizeof(IRB));
  88
  89     memset(region, 0, sizeof(*region));
  90
  91     memcpy(region->orb_area, &sch->orb, sizeof(ORB));
  92     memcpy(region->scsw_area, &sch->curr_status.scsw, sizeof(SCSW));
  93
  94 again:
  95     ret = pwrite(vcdev->vdev.fd, region,
  96                  vcdev->io_region_size, vcdev->io_region_offset);
  97     if (ret != vcdev->io_region_size) {
  98         if (errno == EAGAIN) {
  99             goto again;
 100         }
 101         error_report("vfio-ccw: write I/O region failed with errno=%d", errno);
 102         ret = -errno;
 103     } else {
 104         ret = region->ret_code;
 105     }
 106     switch (ret) {
 107     case 0:
 108         return IOINST_CC_EXPECTED;
 109     case -EBUSY:
 110         return IOINST_CC_BUSY;
 111     case -ENODEV:
 112     case -EACCES:
 113         return IOINST_CC_NOT_OPERATIONAL;
 114     case -EFAULT:
 115     default:
 116         sch_gen_unit_exception(sch);
 117         css_inject_io_interrupt(sch);
 118         return IOINST_CC_EXPECTED;
 119     }
 120 }
 121
 122 static IOInstEnding vfio_ccw_handle_store(SubchDev *sch)
 123 {
 124     S390CCWDevice *cdev = sch->driver_data;
 125     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 126     SCHIB *schib = &sch->curr_status;
 127     struct ccw_schib_region *region = vcdev->schib_region;
 128     SCHIB *s;
 129     int ret;
 130
 131     /* schib region not available so nothing else to do */
 132     if (!region) {
 133         return IOINST_CC_EXPECTED;
 134     }
 135
 136     memset(region, 0, sizeof(*region));
 137     ret = pread(vcdev->vdev.fd, region, vcdev->schib_region_size,
 138                 vcdev->schib_region_offset);
 139
 140     if (ret == -1) {
 141         /*
 142          * Device is probably damaged, but store subchannel does not
 143          * have a nonzero cc defined for this scenario.  Log an error,
 144          * and presume things are otherwise fine.
 145          */
 146         error_report("vfio-ccw: store region read failed with errno=%d", errno);
 147         return IOINST_CC_EXPECTED;
 148     }
 149
 150     /*
 151      * Selectively copy path-related bits of the SCHIB,
 152      * rather than copying the entire struct.
 153      */
 154     s = (SCHIB *)region->schib_area;
 155     schib->pmcw.pnom = s->pmcw.pnom;
 156     schib->pmcw.lpum = s->pmcw.lpum;
 157     schib->pmcw.pam = s->pmcw.pam;
 158     schib->pmcw.pom = s->pmcw.pom;
 159
 160     if (s->scsw.flags & SCSW_FLAGS_MASK_PNO) {
 161         schib->scsw.flags |= SCSW_FLAGS_MASK_PNO;
 162     }
 163
 164     return IOINST_CC_EXPECTED;
 165 }
 166
 167 static int vfio_ccw_handle_clear(SubchDev *sch)
 168 {
 169     S390CCWDevice *cdev = sch->driver_data;
 170     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 171     struct ccw_cmd_region *region = vcdev->async_cmd_region;
 172     int ret;
 173
 174     if (!vcdev->async_cmd_region) {
 175         /* Async command region not available, fall back to emulation */
 176         return -ENOSYS;
 177     }
 178
 179     memset(region, 0, sizeof(*region));
 180     region->command = VFIO_CCW_ASYNC_CMD_CSCH;
 181
 182 again:
 183     ret = pwrite(vcdev->vdev.fd, region,
 184                  vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
 185     if (ret != vcdev->async_cmd_region_size) {
 186         if (errno == EAGAIN) {
 187             goto again;
 188         }
 189         error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
 190         ret = -errno;
 191     } else {
 192         ret = region->ret_code;
 193     }
 194     switch (ret) {
 195     case 0:
 196     case -ENODEV:
 197     case -EACCES:
 198         return 0;
 199     case -EFAULT:
 200     default:
 201         sch_gen_unit_exception(sch);
 202         css_inject_io_interrupt(sch);
 203         return 0;
 204     }
 205 }
 206
 207 static int vfio_ccw_handle_halt(SubchDev *sch)
 208 {
 209     S390CCWDevice *cdev = sch->driver_data;
 210     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 211     struct ccw_cmd_region *region = vcdev->async_cmd_region;
 212     int ret;
 213
 214     if (!vcdev->async_cmd_region) {
 215         /* Async command region not available, fall back to emulation */
 216         return -ENOSYS;
 217     }
 218
 219     memset(region, 0, sizeof(*region));
 220     region->command = VFIO_CCW_ASYNC_CMD_HSCH;
 221
 222 again:
 223     ret = pwrite(vcdev->vdev.fd, region,
 224                  vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
 225     if (ret != vcdev->async_cmd_region_size) {
 226         if (errno == EAGAIN) {
 227             goto again;
 228         }
 229         error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
 230         ret = -errno;
 231     } else {
 232         ret = region->ret_code;
 233     }
 234     switch (ret) {
 235     case 0:
 236     case -EBUSY:
 237     case -ENODEV:
 238     case -EACCES:
 239         return 0;
 240     case -EFAULT:
 241     default:
 242         sch_gen_unit_exception(sch);
 243         css_inject_io_interrupt(sch);
 244         return 0;
 245     }
 246 }
 247
 248 static void vfio_ccw_reset(DeviceState *dev)
 249 {
 250     CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
 251     S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
 252     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 253
 254     ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
 255 }
 256
 257 static void vfio_ccw_io_notifier_handler(void *opaque)
 258 {
 259     VFIOCCWDevice *vcdev = opaque;
 260     struct ccw_io_region *region = vcdev->io_region;
 261     S390CCWDevice *cdev = S390_CCW_DEVICE(vcdev);
 262     CcwDevice *ccw_dev = CCW_DEVICE(cdev);
 263     SubchDev *sch = ccw_dev->sch;
 264     SCHIB *schib = &sch->curr_status;
 265     SCSW s;
 266     IRB irb;
 267     int size;
 268
 269     if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
 270         return;
 271     }
 272
 273     size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
 274                  vcdev->io_region_offset);
 275     if (size == -1) {
 276         switch (errno) {
 277         case ENODEV:
 278             /* Generate a deferred cc 3 condition. */
 279             schib->scsw.flags |= SCSW_FLAGS_MASK_CC;
 280             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 281             schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
 282             goto read_err;
 283         case EFAULT:
 284             /* Memory problem, generate channel data check. */
 285             schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 286             schib->scsw.cstat = SCSW_CSTAT_DATA_CHECK;
 287             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 288             schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
 289                        SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
 290             goto read_err;
 291         default:
 292             /* Error, generate channel program check. */
 293             schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 294             schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK;
 295             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 296             schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
 297                        SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
 298             goto read_err;
 299         }
 300     } else if (size != vcdev->io_region_size) {
 301         /* Information transfer error, generate channel-control check. */
 302         schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 303         schib->scsw.cstat = SCSW_CSTAT_CHN_CTRL_CHK;
 304         schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 305         schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
 306                    SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
 307         goto read_err;
 308     }
 309
 310     memcpy(&irb, region->irb_area, sizeof(IRB));
 311
 312     /* Update control block via irb. */
 313     s = schib->scsw;
 314     copy_scsw_to_guest(&s, &irb.scsw);
 315     schib->scsw = s;
 316
 317     /* If a uint check is pending, copy sense data. */
 318     if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
 319         (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
 320         memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
 321     }
 322
 323 read_err:
 324     css_inject_io_interrupt(sch);
 325 }
 326
 327 static void vfio_ccw_register_io_notifier(VFIOCCWDevice *vcdev, Error **errp)
 328 {
 329     VFIODevice *vdev = &vcdev->vdev;
 330     struct vfio_irq_info *irq_info;
 331     size_t argsz;
 332     int fd;
 333
 334     if (vdev->num_irqs < VFIO_CCW_IO_IRQ_INDEX + 1) {
 335         error_setg(errp, "vfio: unexpected number of io irqs %u",
 336                    vdev->num_irqs);
 337         return;
 338     }
 339
 340     argsz = sizeof(*irq_info);
 341     irq_info = g_malloc0(argsz);
 342     irq_info->index = VFIO_CCW_IO_IRQ_INDEX;
 343     irq_info->argsz = argsz;
 344     if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
 345               irq_info) < 0 || irq_info->count < 1) {
 346         error_setg_errno(errp, errno, "vfio: Error getting irq info");
 347         goto out_free_info;
 348     }
 349
 350     if (event_notifier_init(&vcdev->io_notifier, 0)) {
 351         error_setg_errno(errp, errno,
 352                          "vfio: Unable to init event notifier for IO");
 353         goto out_free_info;
 354     }
 355
 356     fd = event_notifier_get_fd(&vcdev->io_notifier);
 357     qemu_set_fd_handler(fd, vfio_ccw_io_notifier_handler, NULL, vcdev);
 358
 359     if (vfio_set_irq_signaling(vdev, VFIO_CCW_IO_IRQ_INDEX, 0,
 360                                VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
 361         qemu_set_fd_handler(fd, NULL, NULL, vcdev);
 362         event_notifier_cleanup(&vcdev->io_notifier);
 363     }
 364
 365 out_free_info:
 366     g_free(irq_info);
 367 }
 368
 369 static void vfio_ccw_unregister_io_notifier(VFIOCCWDevice *vcdev)
 370 {
 371     Error *err = NULL;
 372
 373     if (vfio_set_irq_signaling(&vcdev->vdev, VFIO_CCW_IO_IRQ_INDEX, 0,
 374                                VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
 375         error_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
 376     }
 377
 378     qemu_set_fd_handler(event_notifier_get_fd(&vcdev->io_notifier),
 379                         NULL, NULL, vcdev);
 380     event_notifier_cleanup(&vcdev->io_notifier);
 381 }
 382
 383 static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
 384 {
 385     VFIODevice *vdev = &vcdev->vdev;
 386     struct vfio_region_info *info;
 387     int ret;
 388
 389     /* Sanity check device */
 390     if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
 391         error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
 392         return;
 393     }
 394
 395     /*
 396      * We always expect at least the I/O region to be present. We also
 397      * may have a variable number of regions governed by capabilities.
 398      */
 399     if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
 400         error_setg(errp, "vfio: too few regions (%u), expected at least %u",
 401                    vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1);
 402         return;
 403     }
 404
 405     ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
 406     if (ret) {
 407         error_setg_errno(errp, -ret, "vfio: Error getting config info");
 408         return;
 409     }
 410
 411     vcdev->io_region_size = info->size;
 412     if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
 413         error_setg(errp, "vfio: Unexpected size of the I/O region");
 414         goto out_err;
 415     }
 416
 417     vcdev->io_region_offset = info->offset;
 418     vcdev->io_region = g_malloc0(info->size);
 419
 420     /* check for the optional async command region */
 421     ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
 422                                    VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD, &info);
 423     if (!ret) {
 424         vcdev->async_cmd_region_size = info->size;
 425         if (sizeof(*vcdev->async_cmd_region) != vcdev->async_cmd_region_size) {
 426             error_setg(errp, "vfio: Unexpected size of the async cmd region");
 427             goto out_err;
 428         }
 429         vcdev->async_cmd_region_offset = info->offset;
 430         vcdev->async_cmd_region = g_malloc0(info->size);
 431     }
 432
 433     ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
 434                                    VFIO_REGION_SUBTYPE_CCW_SCHIB, &info);
 435     if (!ret) {
 436         vcdev->schib_region_size = info->size;
 437         if (sizeof(*vcdev->schib_region) != vcdev->schib_region_size) {
 438             error_setg(errp, "vfio: Unexpected size of the schib region");
 439             goto out_err;
 440         }
 441         vcdev->schib_region_offset = info->offset;
 442         vcdev->schib_region = g_malloc(info->size);
 443     }
 444
 445     g_free(info);
 446     return;
 447
 448 out_err:
 449     g_free(vcdev->schib_region);
 450     g_free(vcdev->async_cmd_region);
 451     g_free(vcdev->io_region);
 452     g_free(info);
 453     return;
 454 }
 455
 456 static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
 457 {
 458     g_free(vcdev->schib_region);
 459     g_free(vcdev->async_cmd_region);
 460     g_free(vcdev->io_region);
 461 }
 462
 463 static void vfio_ccw_put_device(VFIOCCWDevice *vcdev)
 464 {
 465     g_free(vcdev->vdev.name);
 466     vfio_put_base_device(&vcdev->vdev);
 467 }
 468
 469 static void vfio_ccw_get_device(VFIOGroup *group, VFIOCCWDevice *vcdev,
 470                                 Error **errp)
 471 {
 472     char *name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
 473                                  vcdev->cdev.hostid.ssid,
 474                                  vcdev->cdev.hostid.devid);
 475     VFIODevice *vbasedev;
 476
 477     QLIST_FOREACH(vbasedev, &group->device_list, next) {
 478         if (strcmp(vbasedev->name, name) == 0) {
 479             error_setg(errp, "vfio: subchannel %s has already been attached",
 480                        name);
 481             goto out_err;
 482         }
 483     }
 484
 485     /*
 486      * All vfio-ccw devices are believed to operate in a way compatible with
 487      * memory ballooning, ie. pages pinned in the host are in the current
 488      * working set of the guest driver and therefore never overlap with pages
 489      * available to the guest balloon driver.  This needs to be set before
 490      * vfio_get_device() for vfio common to handle the balloon inhibitor.
 491      */
 492     vcdev->vdev.balloon_allowed = true;
 493
 494     if (vfio_get_device(group, vcdev->cdev.mdevid, &vcdev->vdev, errp)) {
 495         goto out_err;
 496     }
 497
 498     vcdev->vdev.ops = &vfio_ccw_ops;
 499     vcdev->vdev.type = VFIO_DEVICE_TYPE_CCW;
 500     vcdev->vdev.name = name;
 501     vcdev->vdev.dev = &vcdev->cdev.parent_obj.parent_obj;
 502
 503     return;
 504
 505 out_err:
 506     g_free(name);
 507 }
 508
 509 static VFIOGroup *vfio_ccw_get_group(S390CCWDevice *cdev, Error **errp)
 510 {
 511     char *tmp, group_path[PATH_MAX];
 512     ssize_t len;
 513     int groupid;
 514
 515     tmp = g_strdup_printf("/sys/bus/css/devices/%x.%x.%04x/%s/iommu_group",
 516                           cdev->hostid.cssid, cdev->hostid.ssid,
 517                           cdev->hostid.devid, cdev->mdevid);
 518     len = readlink(tmp, group_path, sizeof(group_path));
 519     g_free(tmp);
 520
 521     if (len <= 0 || len >= sizeof(group_path)) {
 522         error_setg(errp, "vfio: no iommu_group found");
 523         return NULL;
 524     }
 525
 526     group_path[len] = 0;
 527
 528     if (sscanf(basename(group_path), "%d", &groupid) != 1) {
 529         error_setg(errp, "vfio: failed to read %s", group_path);
 530         return NULL;
 531     }
 532
 533     return vfio_get_group(groupid, &address_space_memory, errp);
 534 }
 535
 536 static void vfio_ccw_realize(DeviceState *dev, Error **errp)
 537 {
 538     VFIOGroup *group;
 539     CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
 540     S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
 541     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 542     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
 543     Error *err = NULL;
 544
 545     /* Call the class init function for subchannel. */
 546     if (cdc->realize) {
 547         cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
 548         if (err) {
 549             goto out_err_propagate;
 550         }
 551     }
 552
 553     group = vfio_ccw_get_group(cdev, &err);
 554     if (!group) {
 555         goto out_group_err;
 556     }
 557
 558     vfio_ccw_get_device(group, vcdev, &err);
 559     if (err) {
 560         goto out_device_err;
 561     }
 562
 563     vfio_ccw_get_region(vcdev, &err);
 564     if (err) {
 565         goto out_region_err;
 566     }
 567
 568     vfio_ccw_register_io_notifier(vcdev, &err);
 569     if (err) {
 570         goto out_notifier_err;
 571     }
 572
 573     return;
 574
 575 out_notifier_err:
 576     vfio_ccw_put_region(vcdev);
 577 out_region_err:
 578     vfio_ccw_put_device(vcdev);
 579 out_device_err:
 580     vfio_put_group(group);
 581 out_group_err:
 582     if (cdc->unrealize) {
 583         cdc->unrealize(cdev);
 584     }
 585 out_err_propagate:
 586     error_propagate(errp, err);
 587 }
 588
 589 static void vfio_ccw_unrealize(DeviceState *dev)
 590 {
 591     CcwDevice *ccw_dev = DO_UPCAST(CcwDevice, parent_obj, dev);
 592     S390CCWDevice *cdev = DO_UPCAST(S390CCWDevice, parent_obj, ccw_dev);
 593     VFIOCCWDevice *vcdev = DO_UPCAST(VFIOCCWDevice, cdev, cdev);
 594     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
 595     VFIOGroup *group = vcdev->vdev.group;
 596
 597     vfio_ccw_unregister_io_notifier(vcdev);
 598     vfio_ccw_put_region(vcdev);
 599     vfio_ccw_put_device(vcdev);
 600     vfio_put_group(group);
 601
 602     if (cdc->unrealize) {
 603         cdc->unrealize(cdev);
 604     }
 605 }
 606
 607 static Property vfio_ccw_properties[] = {
 608     DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
 609     DEFINE_PROP_BOOL("force-orb-pfch", VFIOCCWDevice, force_orb_pfch, false),
 610     DEFINE_PROP_END_OF_LIST(),
 611 };
 612
 613 static const VMStateDescription vfio_ccw_vmstate = {
 614     .name = "vfio-ccw",
 615     .unmigratable = 1,
 616 };
 617
 618 static void vfio_ccw_class_init(ObjectClass *klass, void *data)
 619 {
 620     DeviceClass *dc = DEVICE_CLASS(klass);
 621     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 622
 623     device_class_set_props(dc, vfio_ccw_properties);
 624     dc->vmsd = &vfio_ccw_vmstate;
 625     dc->desc = "VFIO-based subchannel assignment";
 626     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 627     dc->realize = vfio_ccw_realize;
 628     dc->unrealize = vfio_ccw_unrealize;
 629     dc->reset = vfio_ccw_reset;
 630
 631     cdc->handle_request = vfio_ccw_handle_request;
 632     cdc->handle_halt = vfio_ccw_handle_halt;
 633     cdc->handle_clear = vfio_ccw_handle_clear;
 634     cdc->handle_store = vfio_ccw_handle_store;
 635 }
 636
 637 static const TypeInfo vfio_ccw_info = {
 638     .name = TYPE_VFIO_CCW,
 639     .parent = TYPE_S390_CCW,
 640     .instance_size = sizeof(VFIOCCWDevice),
 641     .class_init = vfio_ccw_class_init,
 642 };
 643
 644 static void register_vfio_ccw_type(void)
 645 {
 646     type_register_static(&vfio_ccw_info);
 647 }
 648
 649 type_init(register_vfio_ccw_type)