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/vfio/vfio-common.h"
  24 #include "hw/s390x/s390-ccw.h"
  25 #include "hw/s390x/vfio-ccw.h"
  26 #include "hw/qdev-properties.h"
  27 #include "hw/s390x/ccw-device.h"
  28 #include "exec/address-spaces.h"
  29 #include "qemu/error-report.h"
  30 #include "qemu/main-loop.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     uint64_t schib_region_size;
  43     uint64_t schib_region_offset;
  44     struct ccw_schib_region *schib_region;
  45     uint64_t crw_region_size;
  46     uint64_t crw_region_offset;
  47     struct ccw_crw_region *crw_region;
  48     EventNotifier io_notifier;
  49     EventNotifier crw_notifier;
  50     EventNotifier req_notifier;
  51     bool force_orb_pfch;
  52     bool warned_orb_pfch;
  53 };
  54
  55 static inline void warn_once_pfch(VFIOCCWDevice *vcdev, SubchDev *sch,
  56                                   const char *msg)
  57 {
  58     warn_report_once_cond(&vcdev->warned_orb_pfch,
  59                           "vfio-ccw (devno %x.%x.%04x): %s",
  60                           sch->cssid, sch->ssid, sch->devno, msg);
  61 }
  62
  63 static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
  64 {
  65     vdev->needs_reset = false;
  66 }
  67
  68 /*
  69  * We don't need vfio_hot_reset_multi and vfio_eoi operations for
  70  * vfio_ccw device now.
  71  */
  72 struct VFIODeviceOps vfio_ccw_ops = {
  73     .vfio_compute_needs_reset = vfio_ccw_compute_needs_reset,
  74 };
  75
  76 static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
  77 {
  78     VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
  79     struct ccw_io_region *region = vcdev->io_region;
  80     int ret;
  81
  82     if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH) && vcdev->force_orb_pfch) {
  83         sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
  84         warn_once_pfch(vcdev, sch, "PFCH flag forced");
  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: write I/O region failed with errno=%d", errno);
 104         ret = errno ? -errno : -EFAULT;
 105     } else {
 106         ret = 0;
 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 IOInstEnding vfio_ccw_handle_store(SubchDev *sch)
 125 {
 126     VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
 127     SCHIB *schib = &sch->curr_status;
 128     struct ccw_schib_region *region = vcdev->schib_region;
 129     SCHIB *s;
 130     int ret;
 131
 132     /* schib region not available so nothing else to do */
 133     if (!region) {
 134         return IOINST_CC_EXPECTED;
 135     }
 136
 137     memset(region, 0, sizeof(*region));
 138     ret = pread(vcdev->vdev.fd, region, vcdev->schib_region_size,
 139                 vcdev->schib_region_offset);
 140
 141     if (ret == -1) {
 142         /*
 143          * Device is probably damaged, but store subchannel does not
 144          * have a nonzero cc defined for this scenario.  Log an error,
 145          * and presume things are otherwise fine.
 146          */
 147         error_report("vfio-ccw: store region read failed with errno=%d", errno);
 148         return IOINST_CC_EXPECTED;
 149     }
 150
 151     /*
 152      * Selectively copy path-related bits of the SCHIB,
 153      * rather than copying the entire struct.
 154      */
 155     s = (SCHIB *)region->schib_area;
 156     schib->pmcw.pnom = s->pmcw.pnom;
 157     schib->pmcw.lpum = s->pmcw.lpum;
 158     schib->pmcw.pam = s->pmcw.pam;
 159     schib->pmcw.pom = s->pmcw.pom;
 160
 161     if (s->scsw.flags & SCSW_FLAGS_MASK_PNO) {
 162         schib->scsw.flags |= SCSW_FLAGS_MASK_PNO;
 163     }
 164
 165     return IOINST_CC_EXPECTED;
 166 }
 167
 168 static int vfio_ccw_handle_clear(SubchDev *sch)
 169 {
 170     VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
 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 ? -errno : -EFAULT;
 191     } else {
 192         ret = 0;
 193     }
 194     switch (ret) {
 195     case 0:
 196     case -ENODEV:
 197     case -EACCES:
 198         return ret;
 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     VFIOCCWDevice *vcdev = VFIO_CCW(sch->driver_data);
 210     struct ccw_cmd_region *region = vcdev->async_cmd_region;
 211     int ret;
 212
 213     if (!vcdev->async_cmd_region) {
 214         /* Async command region not available, fall back to emulation */
 215         return -ENOSYS;
 216     }
 217
 218     memset(region, 0, sizeof(*region));
 219     region->command = VFIO_CCW_ASYNC_CMD_HSCH;
 220
 221 again:
 222     ret = pwrite(vcdev->vdev.fd, region,
 223                  vcdev->async_cmd_region_size, vcdev->async_cmd_region_offset);
 224     if (ret != vcdev->async_cmd_region_size) {
 225         if (errno == EAGAIN) {
 226             goto again;
 227         }
 228         error_report("vfio-ccw: write cmd region failed with errno=%d", errno);
 229         ret = errno ? -errno : -EFAULT;
 230     } else {
 231         ret = 0;
 232     }
 233     switch (ret) {
 234     case 0:
 235     case -EBUSY:
 236     case -ENODEV:
 237     case -EACCES:
 238         return ret;
 239     case -EFAULT:
 240     default:
 241         sch_gen_unit_exception(sch);
 242         css_inject_io_interrupt(sch);
 243         return 0;
 244     }
 245 }
 246
 247 static void vfio_ccw_reset(DeviceState *dev)
 248 {
 249     VFIOCCWDevice *vcdev = VFIO_CCW(dev);
 250
 251     ioctl(vcdev->vdev.fd, VFIO_DEVICE_RESET);
 252 }
 253
 254 static void vfio_ccw_crw_read(VFIOCCWDevice *vcdev)
 255 {
 256     struct ccw_crw_region *region = vcdev->crw_region;
 257     CRW crw;
 258     int size;
 259
 260     /* Keep reading CRWs as long as data is returned */
 261     do {
 262         memset(region, 0, sizeof(*region));
 263         size = pread(vcdev->vdev.fd, region, vcdev->crw_region_size,
 264                      vcdev->crw_region_offset);
 265
 266         if (size == -1) {
 267             error_report("vfio-ccw: Read crw region failed with errno=%d",
 268                          errno);
 269             break;
 270         }
 271
 272         if (region->crw == 0) {
 273             /* No more CRWs to queue */
 274             break;
 275         }
 276
 277         memcpy(&crw, &region->crw, sizeof(CRW));
 278
 279         css_crw_add_to_queue(crw);
 280     } while (1);
 281 }
 282
 283 static void vfio_ccw_req_notifier_handler(void *opaque)
 284 {
 285     VFIOCCWDevice *vcdev = opaque;
 286     Error *err = NULL;
 287
 288     if (!event_notifier_test_and_clear(&vcdev->req_notifier)) {
 289         return;
 290     }
 291
 292     qdev_unplug(DEVICE(vcdev), &err);
 293     if (err) {
 294         warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
 295     }
 296 }
 297
 298 static void vfio_ccw_crw_notifier_handler(void *opaque)
 299 {
 300     VFIOCCWDevice *vcdev = opaque;
 301
 302     while (event_notifier_test_and_clear(&vcdev->crw_notifier)) {
 303         vfio_ccw_crw_read(vcdev);
 304     }
 305 }
 306
 307 static void vfio_ccw_io_notifier_handler(void *opaque)
 308 {
 309     VFIOCCWDevice *vcdev = opaque;
 310     struct ccw_io_region *region = vcdev->io_region;
 311     CcwDevice *ccw_dev = CCW_DEVICE(vcdev);
 312     SubchDev *sch = ccw_dev->sch;
 313     SCHIB *schib = &sch->curr_status;
 314     SCSW s;
 315     IRB irb;
 316     ESW esw;
 317     int size;
 318
 319     if (!event_notifier_test_and_clear(&vcdev->io_notifier)) {
 320         return;
 321     }
 322
 323     size = pread(vcdev->vdev.fd, region, vcdev->io_region_size,
 324                  vcdev->io_region_offset);
 325     if (size == -1) {
 326         switch (errno) {
 327         case ENODEV:
 328             /* Generate a deferred cc 3 condition. */
 329             schib->scsw.flags |= SCSW_FLAGS_MASK_CC;
 330             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 331             schib->scsw.ctrl |= (SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND);
 332             goto read_err;
 333         case EFAULT:
 334             /* Memory problem, generate channel data check. */
 335             schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 336             schib->scsw.cstat = SCSW_CSTAT_DATA_CHECK;
 337             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 338             schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
 339                        SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
 340             goto read_err;
 341         default:
 342             /* Error, generate channel program check. */
 343             schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 344             schib->scsw.cstat = SCSW_CSTAT_PROG_CHECK;
 345             schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 346             schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
 347                        SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
 348             goto read_err;
 349         }
 350     } else if (size != vcdev->io_region_size) {
 351         /* Information transfer error, generate channel-control check. */
 352         schib->scsw.ctrl &= ~SCSW_ACTL_START_PEND;
 353         schib->scsw.cstat = SCSW_CSTAT_CHN_CTRL_CHK;
 354         schib->scsw.ctrl &= ~SCSW_CTRL_MASK_STCTL;
 355         schib->scsw.ctrl |= SCSW_STCTL_PRIMARY | SCSW_STCTL_SECONDARY |
 356                    SCSW_STCTL_ALERT | SCSW_STCTL_STATUS_PEND;
 357         goto read_err;
 358     }
 359
 360     memcpy(&irb, region->irb_area, sizeof(IRB));
 361
 362     /* Update control block via irb. */
 363     s = schib->scsw;
 364     copy_scsw_to_guest(&s, &irb.scsw);
 365     schib->scsw = s;
 366
 367     copy_esw_to_guest(&esw, &irb.esw);
 368     sch->esw = esw;
 369
 370     /* If a uint check is pending, copy sense data. */
 371     if ((schib->scsw.dstat & SCSW_DSTAT_UNIT_CHECK) &&
 372         (schib->pmcw.chars & PMCW_CHARS_MASK_CSENSE)) {
 373         memcpy(sch->sense_data, irb.ecw, sizeof(irb.ecw));
 374     }
 375
 376 read_err:
 377     css_inject_io_interrupt(sch);
 378 }
 379
 380 static void vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev,
 381                                            unsigned int irq,
 382                                            Error **errp)
 383 {
 384     VFIODevice *vdev = &vcdev->vdev;
 385     struct vfio_irq_info *irq_info;
 386     size_t argsz;
 387     int fd;
 388     EventNotifier *notifier;
 389     IOHandler *fd_read;
 390
 391     switch (irq) {
 392     case VFIO_CCW_IO_IRQ_INDEX:
 393         notifier = &vcdev->io_notifier;
 394         fd_read = vfio_ccw_io_notifier_handler;
 395         break;
 396     case VFIO_CCW_CRW_IRQ_INDEX:
 397         notifier = &vcdev->crw_notifier;
 398         fd_read = vfio_ccw_crw_notifier_handler;
 399         break;
 400     case VFIO_CCW_REQ_IRQ_INDEX:
 401         notifier = &vcdev->req_notifier;
 402         fd_read = vfio_ccw_req_notifier_handler;
 403         break;
 404     default:
 405         error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
 406         return;
 407     }
 408
 409     if (vdev->num_irqs < irq + 1) {
 410         error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
 411                    irq, vdev->num_irqs);
 412         return;
 413     }
 414
 415     argsz = sizeof(*irq_info);
 416     irq_info = g_malloc0(argsz);
 417     irq_info->index = irq;
 418     irq_info->argsz = argsz;
 419     if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
 420               irq_info) < 0 || irq_info->count < 1) {
 421         error_setg_errno(errp, errno, "vfio: Error getting irq info");
 422         goto out_free_info;
 423     }
 424
 425     if (event_notifier_init(notifier, 0)) {
 426         error_setg_errno(errp, errno,
 427                          "vfio: Unable to init event notifier for irq (%d)",
 428                          irq);
 429         goto out_free_info;
 430     }
 431
 432     fd = event_notifier_get_fd(notifier);
 433     qemu_set_fd_handler(fd, fd_read, NULL, vcdev);
 434
 435     if (vfio_set_irq_signaling(vdev, irq, 0,
 436                                VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
 437         qemu_set_fd_handler(fd, NULL, NULL, vcdev);
 438         event_notifier_cleanup(notifier);
 439     }
 440
 441 out_free_info:
 442     g_free(irq_info);
 443 }
 444
 445 static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
 446                                              unsigned int irq)
 447 {
 448     Error *err = NULL;
 449     EventNotifier *notifier;
 450
 451     switch (irq) {
 452     case VFIO_CCW_IO_IRQ_INDEX:
 453         notifier = &vcdev->io_notifier;
 454         break;
 455     case VFIO_CCW_CRW_IRQ_INDEX:
 456         notifier = &vcdev->crw_notifier;
 457         break;
 458     case VFIO_CCW_REQ_IRQ_INDEX:
 459         notifier = &vcdev->req_notifier;
 460         break;
 461     default:
 462         error_report("vfio: Unsupported device irq(%d)", irq);
 463         return;
 464     }
 465
 466     if (vfio_set_irq_signaling(&vcdev->vdev, irq, 0,
 467                                VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
 468         warn_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
 469     }
 470
 471     qemu_set_fd_handler(event_notifier_get_fd(notifier),
 472                         NULL, NULL, vcdev);
 473     event_notifier_cleanup(notifier);
 474 }
 475
 476 static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
 477 {
 478     VFIODevice *vdev = &vcdev->vdev;
 479     struct vfio_region_info *info;
 480     int ret;
 481
 482     /* Sanity check device */
 483     if (!(vdev->flags & VFIO_DEVICE_FLAGS_CCW)) {
 484         error_setg(errp, "vfio: Um, this isn't a vfio-ccw device");
 485         return;
 486     }
 487
 488     /*
 489      * We always expect at least the I/O region to be present. We also
 490      * may have a variable number of regions governed by capabilities.
 491      */
 492     if (vdev->num_regions < VFIO_CCW_CONFIG_REGION_INDEX + 1) {
 493         error_setg(errp, "vfio: too few regions (%u), expected at least %u",
 494                    vdev->num_regions, VFIO_CCW_CONFIG_REGION_INDEX + 1);
 495         return;
 496     }
 497
 498     ret = vfio_get_region_info(vdev, VFIO_CCW_CONFIG_REGION_INDEX, &info);
 499     if (ret) {
 500         error_setg_errno(errp, -ret, "vfio: Error getting config info");
 501         return;
 502     }
 503
 504     vcdev->io_region_size = info->size;
 505     if (sizeof(*vcdev->io_region) != vcdev->io_region_size) {
 506         error_setg(errp, "vfio: Unexpected size of the I/O region");
 507         goto out_err;
 508     }
 509
 510     vcdev->io_region_offset = info->offset;
 511     vcdev->io_region = g_malloc0(info->size);
 512     g_free(info);
 513
 514     /* check for the optional async command region */
 515     ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
 516                                    VFIO_REGION_SUBTYPE_CCW_ASYNC_CMD, &info);
 517     if (!ret) {
 518         vcdev->async_cmd_region_size = info->size;
 519         if (sizeof(*vcdev->async_cmd_region) != vcdev->async_cmd_region_size) {
 520             error_setg(errp, "vfio: Unexpected size of the async cmd region");
 521             goto out_err;
 522         }
 523         vcdev->async_cmd_region_offset = info->offset;
 524         vcdev->async_cmd_region = g_malloc0(info->size);
 525         g_free(info);
 526     }
 527
 528     ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
 529                                    VFIO_REGION_SUBTYPE_CCW_SCHIB, &info);
 530     if (!ret) {
 531         vcdev->schib_region_size = info->size;
 532         if (sizeof(*vcdev->schib_region) != vcdev->schib_region_size) {
 533             error_setg(errp, "vfio: Unexpected size of the schib region");
 534             goto out_err;
 535         }
 536         vcdev->schib_region_offset = info->offset;
 537         vcdev->schib_region = g_malloc(info->size);
 538         g_free(info);
 539     }
 540
 541     ret = vfio_get_dev_region_info(vdev, VFIO_REGION_TYPE_CCW,
 542                                    VFIO_REGION_SUBTYPE_CCW_CRW, &info);
 543
 544     if (!ret) {
 545         vcdev->crw_region_size = info->size;
 546         if (sizeof(*vcdev->crw_region) != vcdev->crw_region_size) {
 547             error_setg(errp, "vfio: Unexpected size of the CRW region");
 548             goto out_err;
 549         }
 550         vcdev->crw_region_offset = info->offset;
 551         vcdev->crw_region = g_malloc(info->size);
 552         g_free(info);
 553     }
 554
 555     return;
 556
 557 out_err:
 558     g_free(vcdev->crw_region);
 559     g_free(vcdev->schib_region);
 560     g_free(vcdev->async_cmd_region);
 561     g_free(vcdev->io_region);
 562     g_free(info);
 563     return;
 564 }
 565
 566 static void vfio_ccw_put_region(VFIOCCWDevice *vcdev)
 567 {
 568     g_free(vcdev->crw_region);
 569     g_free(vcdev->schib_region);
 570     g_free(vcdev->async_cmd_region);
 571     g_free(vcdev->io_region);
 572 }
 573
 574 static void vfio_ccw_realize(DeviceState *dev, Error **errp)
 575 {
 576     S390CCWDevice *cdev = S390_CCW_DEVICE(dev);
 577     VFIOCCWDevice *vcdev = VFIO_CCW(cdev);
 578     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
 579     VFIODevice *vbasedev = &vcdev->vdev;
 580     Error *err = NULL;
 581     int ret;
 582
 583     /* Call the class init function for subchannel. */
 584     if (cdc->realize) {
 585         cdc->realize(cdev, vcdev->vdev.sysfsdev, &err);
 586         if (err) {
 587             goto out_err_propagate;
 588         }
 589     }
 590
 591     vbasedev->ops = &vfio_ccw_ops;
 592     vbasedev->type = VFIO_DEVICE_TYPE_CCW;
 593     vbasedev->name = g_strdup_printf("%x.%x.%04x", vcdev->cdev.hostid.cssid,
 594                            vcdev->cdev.hostid.ssid,
 595                            vcdev->cdev.hostid.devid);
 596     vbasedev->dev = dev;
 597
 598     /*
 599      * All vfio-ccw devices are believed to operate in a way compatible with
 600      * discarding of memory in RAM blocks, ie. pages pinned in the host are
 601      * in the current working set of the guest driver and therefore never
 602      * overlap e.g., with pages available to the guest balloon driver.  This
 603      * needs to be set before vfio_get_device() for vfio common to handle
 604      * ram_block_discard_disable().
 605      */
 606     vbasedev->ram_block_discard_allowed = true;
 607
 608     ret = vfio_attach_device(cdev->mdevid, vbasedev,
 609                              &address_space_memory, errp);
 610     if (ret) {
 611         goto out_attach_dev_err;
 612     }
 613
 614     vfio_ccw_get_region(vcdev, &err);
 615     if (err) {
 616         goto out_region_err;
 617     }
 618
 619     vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, &err);
 620     if (err) {
 621         goto out_io_notifier_err;
 622     }
 623
 624     if (vcdev->crw_region) {
 625         vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX, &err);
 626         if (err) {
 627             goto out_irq_notifier_err;
 628         }
 629     }
 630
 631     vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX, &err);
 632     if (err) {
 633         /*
 634          * Report this error, but do not make it a failing condition.
 635          * Lack of this IRQ in the host does not prevent normal operation.
 636          */
 637         error_report_err(err);
 638     }
 639
 640     return;
 641
 642 out_irq_notifier_err:
 643     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
 644     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
 645     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
 646 out_io_notifier_err:
 647     vfio_ccw_put_region(vcdev);
 648 out_region_err:
 649     vfio_detach_device(vbasedev);
 650 out_attach_dev_err:
 651     g_free(vbasedev->name);
 652     if (cdc->unrealize) {
 653         cdc->unrealize(cdev);
 654     }
 655 out_err_propagate:
 656     error_propagate(errp, err);
 657 }
 658
 659 static void vfio_ccw_unrealize(DeviceState *dev)
 660 {
 661     S390CCWDevice *cdev = S390_CCW_DEVICE(dev);
 662     VFIOCCWDevice *vcdev = VFIO_CCW(cdev);
 663     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
 664
 665     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_REQ_IRQ_INDEX);
 666     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_CRW_IRQ_INDEX);
 667     vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
 668     vfio_ccw_put_region(vcdev);
 669     vfio_detach_device(&vcdev->vdev);
 670     g_free(vcdev->vdev.name);
 671
 672     if (cdc->unrealize) {
 673         cdc->unrealize(cdev);
 674     }
 675 }
 676
 677 static Property vfio_ccw_properties[] = {
 678     DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
 679     DEFINE_PROP_BOOL("force-orb-pfch", VFIOCCWDevice, force_orb_pfch, false),
 680     DEFINE_PROP_END_OF_LIST(),
 681 };
 682
 683 static const VMStateDescription vfio_ccw_vmstate = {
 684     .name = "vfio-ccw",
 685     .unmigratable = 1,
 686 };
 687
 688 static void vfio_ccw_class_init(ObjectClass *klass, void *data)
 689 {
 690     DeviceClass *dc = DEVICE_CLASS(klass);
 691     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_CLASS(klass);
 692
 693     device_class_set_props(dc, vfio_ccw_properties);
 694     dc->vmsd = &vfio_ccw_vmstate;
 695     dc->desc = "VFIO-based subchannel assignment";
 696     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 697     dc->realize = vfio_ccw_realize;
 698     dc->unrealize = vfio_ccw_unrealize;
 699     dc->reset = vfio_ccw_reset;
 700
 701     cdc->handle_request = vfio_ccw_handle_request;
 702     cdc->handle_halt = vfio_ccw_handle_halt;
 703     cdc->handle_clear = vfio_ccw_handle_clear;
 704     cdc->handle_store = vfio_ccw_handle_store;
 705 }
 706
 707 static const TypeInfo vfio_ccw_info = {
 708     .name = TYPE_VFIO_CCW,
 709     .parent = TYPE_S390_CCW,
 710     .instance_size = sizeof(VFIOCCWDevice),
 711     .class_init = vfio_ccw_class_init,
 712 };
 713
 714 static void register_vfio_ccw_type(void)
 715 {
 716     type_register_static(&vfio_ccw_info);
 717 }
 718
 719 type_init(register_vfio_ccw_type)