1 /* 2 * virtio ccw target implementation 3 * 4 * Copyright 2012,2015 IBM Corp. 5 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> 6 * Pierre Morel <pmorel@linux.vnet.ibm.com> 7 * 8 * This work is licensed under the terms of the GNU GPL, version 2 or (at 9 * your option) any later version. See the COPYING file in the top-level 10 * directory. 11 */ 12 13 #include "qemu/osdep.h" 14 #include "qapi/error.h" 15 #include "sysemu/kvm.h" 16 #include "net/net.h" 17 #include "hw/virtio/virtio.h" 18 #include "migration/qemu-file-types.h" 19 #include "hw/virtio/virtio-net.h" 20 #include "hw/sysbus.h" 21 #include "qemu/bitops.h" 22 #include "qemu/error-report.h" 23 #include "qemu/module.h" 24 #include "hw/virtio/virtio-access.h" 25 #include "hw/virtio/virtio-bus.h" 26 #include "hw/s390x/adapter.h" 27 #include "hw/s390x/s390_flic.h" 28 29 #include "hw/s390x/ioinst.h" 30 #include "hw/s390x/css.h" 31 #include "virtio-ccw.h" 32 #include "trace.h" 33 #include "hw/s390x/css-bridge.h" 34 #include "hw/s390x/s390-virtio-ccw.h" 35 36 #define NR_CLASSIC_INDICATOR_BITS 64 37 38 static int virtio_ccw_dev_post_load(void *opaque, int version_id) 39 { 40 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(opaque); 41 CcwDevice *ccw_dev = CCW_DEVICE(dev); 42 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 43 44 ccw_dev->sch->driver_data = dev; 45 if (ccw_dev->sch->thinint_active) { 46 dev->routes.adapter.adapter_id = css_get_adapter_id( 47 CSS_IO_ADAPTER_VIRTIO, 48 dev->thinint_isc); 49 } 50 /* Re-fill subch_id after loading the subchannel states.*/ 51 if (ck->refill_ids) { 52 ck->refill_ids(ccw_dev); 53 } 54 return 0; 55 } 56 57 typedef struct VirtioCcwDeviceTmp { 58 VirtioCcwDevice *parent; 59 uint16_t config_vector; 60 } VirtioCcwDeviceTmp; 61 62 static int virtio_ccw_dev_tmp_pre_save(void *opaque) 63 { 64 VirtioCcwDeviceTmp *tmp = opaque; 65 VirtioCcwDevice *dev = tmp->parent; 66 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 67 68 tmp->config_vector = vdev->config_vector; 69 70 return 0; 71 } 72 73 static int virtio_ccw_dev_tmp_post_load(void *opaque, int version_id) 74 { 75 VirtioCcwDeviceTmp *tmp = opaque; 76 VirtioCcwDevice *dev = tmp->parent; 77 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 78 79 vdev->config_vector = tmp->config_vector; 80 return 0; 81 } 82 83 const VMStateDescription vmstate_virtio_ccw_dev_tmp = { 84 .name = "s390_virtio_ccw_dev_tmp", 85 .pre_save = virtio_ccw_dev_tmp_pre_save, 86 .post_load = virtio_ccw_dev_tmp_post_load, 87 .fields = (VMStateField[]) { 88 VMSTATE_UINT16(config_vector, VirtioCcwDeviceTmp), 89 VMSTATE_END_OF_LIST() 90 } 91 }; 92 93 const VMStateDescription vmstate_virtio_ccw_dev = { 94 .name = "s390_virtio_ccw_dev", 95 .version_id = 1, 96 .minimum_version_id = 1, 97 .post_load = virtio_ccw_dev_post_load, 98 .fields = (VMStateField[]) { 99 VMSTATE_CCW_DEVICE(parent_obj, VirtioCcwDevice), 100 VMSTATE_PTR_TO_IND_ADDR(indicators, VirtioCcwDevice), 101 VMSTATE_PTR_TO_IND_ADDR(indicators2, VirtioCcwDevice), 102 VMSTATE_PTR_TO_IND_ADDR(summary_indicator, VirtioCcwDevice), 103 /* 104 * Ugly hack because VirtIODevice does not migrate itself. 105 * This also makes legacy via vmstate_save_state possible. 106 */ 107 VMSTATE_WITH_TMP(VirtioCcwDevice, VirtioCcwDeviceTmp, 108 vmstate_virtio_ccw_dev_tmp), 109 VMSTATE_STRUCT(routes, VirtioCcwDevice, 1, vmstate_adapter_routes, 110 AdapterRoutes), 111 VMSTATE_UINT8(thinint_isc, VirtioCcwDevice), 112 VMSTATE_INT32(revision, VirtioCcwDevice), 113 VMSTATE_END_OF_LIST() 114 } 115 }; 116 117 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 118 VirtioCcwDevice *dev); 119 120 VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch) 121 { 122 VirtIODevice *vdev = NULL; 123 VirtioCcwDevice *dev = sch->driver_data; 124 125 if (dev) { 126 vdev = virtio_bus_get_device(&dev->bus); 127 } 128 return vdev; 129 } 130 131 static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev) 132 { 133 virtio_bus_start_ioeventfd(&dev->bus); 134 } 135 136 static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev) 137 { 138 virtio_bus_stop_ioeventfd(&dev->bus); 139 } 140 141 static bool virtio_ccw_ioeventfd_enabled(DeviceState *d) 142 { 143 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 144 145 return (dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) != 0; 146 } 147 148 static int virtio_ccw_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, 149 int n, bool assign) 150 { 151 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 152 CcwDevice *ccw_dev = CCW_DEVICE(dev); 153 SubchDev *sch = ccw_dev->sch; 154 uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid; 155 156 return s390_assign_subch_ioeventfd(notifier, sch_id, n, assign); 157 } 158 159 /* Communication blocks used by several channel commands. */ 160 typedef struct VqInfoBlockLegacy { 161 uint64_t queue; 162 uint32_t align; 163 uint16_t index; 164 uint16_t num; 165 } QEMU_PACKED VqInfoBlockLegacy; 166 167 typedef struct VqInfoBlock { 168 uint64_t desc; 169 uint32_t res0; 170 uint16_t index; 171 uint16_t num; 172 uint64_t avail; 173 uint64_t used; 174 } QEMU_PACKED VqInfoBlock; 175 176 typedef struct VqConfigBlock { 177 uint16_t index; 178 uint16_t num_max; 179 } QEMU_PACKED VqConfigBlock; 180 181 typedef struct VirtioFeatDesc { 182 uint32_t features; 183 uint8_t index; 184 } QEMU_PACKED VirtioFeatDesc; 185 186 typedef struct VirtioThinintInfo { 187 hwaddr summary_indicator; 188 hwaddr device_indicator; 189 uint64_t ind_bit; 190 uint8_t isc; 191 } QEMU_PACKED VirtioThinintInfo; 192 193 typedef struct VirtioRevInfo { 194 uint16_t revision; 195 uint16_t length; 196 uint8_t data[]; 197 } QEMU_PACKED VirtioRevInfo; 198 199 /* Specify where the virtqueues for the subchannel are in guest memory. */ 200 static int virtio_ccw_set_vqs(SubchDev *sch, VqInfoBlock *info, 201 VqInfoBlockLegacy *linfo) 202 { 203 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 204 uint16_t index = info ? info->index : linfo->index; 205 uint16_t num = info ? info->num : linfo->num; 206 uint64_t desc = info ? info->desc : linfo->queue; 207 208 if (index >= VIRTIO_QUEUE_MAX) { 209 return -EINVAL; 210 } 211 212 /* Current code in virtio.c relies on 4K alignment. */ 213 if (linfo && desc && (linfo->align != 4096)) { 214 return -EINVAL; 215 } 216 217 if (!vdev) { 218 return -EINVAL; 219 } 220 221 if (info) { 222 virtio_queue_set_rings(vdev, index, desc, info->avail, info->used); 223 } else { 224 virtio_queue_set_addr(vdev, index, desc); 225 } 226 if (!desc) { 227 virtio_queue_set_vector(vdev, index, VIRTIO_NO_VECTOR); 228 } else { 229 if (info) { 230 /* virtio-1 allows changing the ring size. */ 231 if (virtio_queue_get_max_num(vdev, index) < num) { 232 /* Fail if we exceed the maximum number. */ 233 return -EINVAL; 234 } 235 virtio_queue_set_num(vdev, index, num); 236 } else if (virtio_queue_get_num(vdev, index) > num) { 237 /* Fail if we don't have a big enough queue. */ 238 return -EINVAL; 239 } 240 /* We ignore possible increased num for legacy for compatibility. */ 241 virtio_queue_set_vector(vdev, index, index); 242 } 243 /* tell notify handler in case of config change */ 244 vdev->config_vector = VIRTIO_QUEUE_MAX; 245 return 0; 246 } 247 248 static void virtio_ccw_reset_virtio(VirtioCcwDevice *dev, VirtIODevice *vdev) 249 { 250 CcwDevice *ccw_dev = CCW_DEVICE(dev); 251 252 virtio_ccw_stop_ioeventfd(dev); 253 virtio_reset(vdev); 254 if (dev->indicators) { 255 release_indicator(&dev->routes.adapter, dev->indicators); 256 dev->indicators = NULL; 257 } 258 if (dev->indicators2) { 259 release_indicator(&dev->routes.adapter, dev->indicators2); 260 dev->indicators2 = NULL; 261 } 262 if (dev->summary_indicator) { 263 release_indicator(&dev->routes.adapter, dev->summary_indicator); 264 dev->summary_indicator = NULL; 265 } 266 ccw_dev->sch->thinint_active = false; 267 } 268 269 static int virtio_ccw_handle_set_vq(SubchDev *sch, CCW1 ccw, bool check_len, 270 bool is_legacy) 271 { 272 int ret; 273 VqInfoBlock info; 274 VqInfoBlockLegacy linfo; 275 size_t info_len = is_legacy ? sizeof(linfo) : sizeof(info); 276 277 if (check_len) { 278 if (ccw.count != info_len) { 279 return -EINVAL; 280 } 281 } else if (ccw.count < info_len) { 282 /* Can't execute command. */ 283 return -EINVAL; 284 } 285 if (!ccw.cda) { 286 return -EFAULT; 287 } 288 if (is_legacy) { 289 ccw_dstream_read(&sch->cds, linfo); 290 linfo.queue = be64_to_cpu(linfo.queue); 291 linfo.align = be32_to_cpu(linfo.align); 292 linfo.index = be16_to_cpu(linfo.index); 293 linfo.num = be16_to_cpu(linfo.num); 294 ret = virtio_ccw_set_vqs(sch, NULL, &linfo); 295 } else { 296 ccw_dstream_read(&sch->cds, info); 297 info.desc = be64_to_cpu(info.desc); 298 info.index = be16_to_cpu(info.index); 299 info.num = be16_to_cpu(info.num); 300 info.avail = be64_to_cpu(info.avail); 301 info.used = be64_to_cpu(info.used); 302 ret = virtio_ccw_set_vqs(sch, &info, NULL); 303 } 304 sch->curr_status.scsw.count = 0; 305 return ret; 306 } 307 308 static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) 309 { 310 int ret; 311 VirtioRevInfo revinfo; 312 uint8_t status; 313 VirtioFeatDesc features; 314 hwaddr indicators; 315 VqConfigBlock vq_config; 316 VirtioCcwDevice *dev = sch->driver_data; 317 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 318 bool check_len; 319 int len; 320 VirtioThinintInfo thinint; 321 322 if (!dev) { 323 return -EINVAL; 324 } 325 326 trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid, 327 ccw.cmd_code); 328 check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); 329 330 if (dev->force_revision_1 && dev->revision < 0 && 331 ccw.cmd_code != CCW_CMD_SET_VIRTIO_REV) { 332 /* 333 * virtio-1 drivers must start with negotiating to a revision >= 1, 334 * so post a command reject for all other commands 335 */ 336 return -ENOSYS; 337 } 338 339 /* Look at the command. */ 340 switch (ccw.cmd_code) { 341 case CCW_CMD_SET_VQ: 342 ret = virtio_ccw_handle_set_vq(sch, ccw, check_len, dev->revision < 1); 343 break; 344 case CCW_CMD_VDEV_RESET: 345 virtio_ccw_reset_virtio(dev, vdev); 346 ret = 0; 347 break; 348 case CCW_CMD_READ_FEAT: 349 if (check_len) { 350 if (ccw.count != sizeof(features)) { 351 ret = -EINVAL; 352 break; 353 } 354 } else if (ccw.count < sizeof(features)) { 355 /* Can't execute command. */ 356 ret = -EINVAL; 357 break; 358 } 359 if (!ccw.cda) { 360 ret = -EFAULT; 361 } else { 362 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 363 364 ccw_dstream_advance(&sch->cds, sizeof(features.features)); 365 ccw_dstream_read(&sch->cds, features.index); 366 if (features.index == 0) { 367 if (dev->revision >= 1) { 368 /* Don't offer legacy features for modern devices. */ 369 features.features = (uint32_t) 370 (vdev->host_features & ~vdc->legacy_features); 371 } else { 372 features.features = (uint32_t)vdev->host_features; 373 } 374 } else if ((features.index == 1) && (dev->revision >= 1)) { 375 /* 376 * Only offer feature bits beyond 31 if the guest has 377 * negotiated at least revision 1. 378 */ 379 features.features = (uint32_t)(vdev->host_features >> 32); 380 } else { 381 /* Return zeroes if the guest supports more feature bits. */ 382 features.features = 0; 383 } 384 ccw_dstream_rewind(&sch->cds); 385 features.features = cpu_to_le32(features.features); 386 ccw_dstream_write(&sch->cds, features.features); 387 sch->curr_status.scsw.count = ccw.count - sizeof(features); 388 ret = 0; 389 } 390 break; 391 case CCW_CMD_WRITE_FEAT: 392 if (check_len) { 393 if (ccw.count != sizeof(features)) { 394 ret = -EINVAL; 395 break; 396 } 397 } else if (ccw.count < sizeof(features)) { 398 /* Can't execute command. */ 399 ret = -EINVAL; 400 break; 401 } 402 if (!ccw.cda) { 403 ret = -EFAULT; 404 } else { 405 ccw_dstream_read(&sch->cds, features); 406 features.features = le32_to_cpu(features.features); 407 if (features.index == 0) { 408 virtio_set_features(vdev, 409 (vdev->guest_features & 0xffffffff00000000ULL) | 410 features.features); 411 } else if ((features.index == 1) && (dev->revision >= 1)) { 412 /* 413 * If the guest did not negotiate at least revision 1, 414 * we did not offer it any feature bits beyond 31. Such a 415 * guest passing us any bit here is therefore buggy. 416 */ 417 virtio_set_features(vdev, 418 (vdev->guest_features & 0x00000000ffffffffULL) | 419 ((uint64_t)features.features << 32)); 420 } else { 421 /* 422 * If the guest supports more feature bits, assert that it 423 * passes us zeroes for those we don't support. 424 */ 425 if (features.features) { 426 qemu_log_mask(LOG_GUEST_ERROR, 427 "Guest bug: features[%i]=%x (expected 0)", 428 features.index, features.features); 429 /* XXX: do a unit check here? */ 430 } 431 } 432 sch->curr_status.scsw.count = ccw.count - sizeof(features); 433 ret = 0; 434 } 435 break; 436 case CCW_CMD_READ_CONF: 437 if (check_len) { 438 if (ccw.count > vdev->config_len) { 439 ret = -EINVAL; 440 break; 441 } 442 } 443 len = MIN(ccw.count, vdev->config_len); 444 if (!ccw.cda) { 445 ret = -EFAULT; 446 } else { 447 virtio_bus_get_vdev_config(&dev->bus, vdev->config); 448 ccw_dstream_write_buf(&sch->cds, vdev->config, len); 449 sch->curr_status.scsw.count = ccw.count - len; 450 ret = 0; 451 } 452 break; 453 case CCW_CMD_WRITE_CONF: 454 if (check_len) { 455 if (ccw.count > vdev->config_len) { 456 ret = -EINVAL; 457 break; 458 } 459 } 460 len = MIN(ccw.count, vdev->config_len); 461 if (!ccw.cda) { 462 ret = -EFAULT; 463 } else { 464 ret = ccw_dstream_read_buf(&sch->cds, vdev->config, len); 465 if (!ret) { 466 virtio_bus_set_vdev_config(&dev->bus, vdev->config); 467 sch->curr_status.scsw.count = ccw.count - len; 468 } 469 } 470 break; 471 case CCW_CMD_READ_STATUS: 472 if (check_len) { 473 if (ccw.count != sizeof(status)) { 474 ret = -EINVAL; 475 break; 476 } 477 } else if (ccw.count < sizeof(status)) { 478 /* Can't execute command. */ 479 ret = -EINVAL; 480 break; 481 } 482 if (!ccw.cda) { 483 ret = -EFAULT; 484 } else { 485 address_space_stb(&address_space_memory, ccw.cda, vdev->status, 486 MEMTXATTRS_UNSPECIFIED, NULL); 487 sch->curr_status.scsw.count = ccw.count - sizeof(vdev->status); 488 ret = 0; 489 } 490 break; 491 case CCW_CMD_WRITE_STATUS: 492 if (check_len) { 493 if (ccw.count != sizeof(status)) { 494 ret = -EINVAL; 495 break; 496 } 497 } else if (ccw.count < sizeof(status)) { 498 /* Can't execute command. */ 499 ret = -EINVAL; 500 break; 501 } 502 if (!ccw.cda) { 503 ret = -EFAULT; 504 } else { 505 ccw_dstream_read(&sch->cds, status); 506 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { 507 virtio_ccw_stop_ioeventfd(dev); 508 } 509 if (virtio_set_status(vdev, status) == 0) { 510 if (vdev->status == 0) { 511 virtio_ccw_reset_virtio(dev, vdev); 512 } 513 if (status & VIRTIO_CONFIG_S_DRIVER_OK) { 514 virtio_ccw_start_ioeventfd(dev); 515 } 516 sch->curr_status.scsw.count = ccw.count - sizeof(status); 517 ret = 0; 518 } else { 519 /* Trigger a command reject. */ 520 ret = -ENOSYS; 521 } 522 } 523 break; 524 case CCW_CMD_SET_IND: 525 if (check_len) { 526 if (ccw.count != sizeof(indicators)) { 527 ret = -EINVAL; 528 break; 529 } 530 } else if (ccw.count < sizeof(indicators)) { 531 /* Can't execute command. */ 532 ret = -EINVAL; 533 break; 534 } 535 if (sch->thinint_active) { 536 /* Trigger a command reject. */ 537 ret = -ENOSYS; 538 break; 539 } 540 if (virtio_get_num_queues(vdev) > NR_CLASSIC_INDICATOR_BITS) { 541 /* More queues than indicator bits --> trigger a reject */ 542 ret = -ENOSYS; 543 break; 544 } 545 if (!ccw.cda) { 546 ret = -EFAULT; 547 } else { 548 ccw_dstream_read(&sch->cds, indicators); 549 indicators = be64_to_cpu(indicators); 550 dev->indicators = get_indicator(indicators, sizeof(uint64_t)); 551 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 552 ret = 0; 553 } 554 break; 555 case CCW_CMD_SET_CONF_IND: 556 if (check_len) { 557 if (ccw.count != sizeof(indicators)) { 558 ret = -EINVAL; 559 break; 560 } 561 } else if (ccw.count < sizeof(indicators)) { 562 /* Can't execute command. */ 563 ret = -EINVAL; 564 break; 565 } 566 if (!ccw.cda) { 567 ret = -EFAULT; 568 } else { 569 ccw_dstream_read(&sch->cds, indicators); 570 indicators = be64_to_cpu(indicators); 571 dev->indicators2 = get_indicator(indicators, sizeof(uint64_t)); 572 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 573 ret = 0; 574 } 575 break; 576 case CCW_CMD_READ_VQ_CONF: 577 if (check_len) { 578 if (ccw.count != sizeof(vq_config)) { 579 ret = -EINVAL; 580 break; 581 } 582 } else if (ccw.count < sizeof(vq_config)) { 583 /* Can't execute command. */ 584 ret = -EINVAL; 585 break; 586 } 587 if (!ccw.cda) { 588 ret = -EFAULT; 589 } else { 590 ccw_dstream_read(&sch->cds, vq_config.index); 591 vq_config.index = be16_to_cpu(vq_config.index); 592 if (vq_config.index >= VIRTIO_QUEUE_MAX) { 593 ret = -EINVAL; 594 break; 595 } 596 vq_config.num_max = virtio_queue_get_num(vdev, 597 vq_config.index); 598 vq_config.num_max = cpu_to_be16(vq_config.num_max); 599 ccw_dstream_write(&sch->cds, vq_config.num_max); 600 sch->curr_status.scsw.count = ccw.count - sizeof(vq_config); 601 ret = 0; 602 } 603 break; 604 case CCW_CMD_SET_IND_ADAPTER: 605 if (check_len) { 606 if (ccw.count != sizeof(thinint)) { 607 ret = -EINVAL; 608 break; 609 } 610 } else if (ccw.count < sizeof(thinint)) { 611 /* Can't execute command. */ 612 ret = -EINVAL; 613 break; 614 } 615 if (!ccw.cda) { 616 ret = -EFAULT; 617 } else if (dev->indicators && !sch->thinint_active) { 618 /* Trigger a command reject. */ 619 ret = -ENOSYS; 620 } else { 621 if (ccw_dstream_read(&sch->cds, thinint)) { 622 ret = -EFAULT; 623 } else { 624 thinint.ind_bit = be64_to_cpu(thinint.ind_bit); 625 thinint.summary_indicator = 626 be64_to_cpu(thinint.summary_indicator); 627 thinint.device_indicator = 628 be64_to_cpu(thinint.device_indicator); 629 630 dev->summary_indicator = 631 get_indicator(thinint.summary_indicator, sizeof(uint8_t)); 632 dev->indicators = 633 get_indicator(thinint.device_indicator, 634 thinint.ind_bit / 8 + 1); 635 dev->thinint_isc = thinint.isc; 636 dev->routes.adapter.ind_offset = thinint.ind_bit; 637 dev->routes.adapter.summary_offset = 7; 638 dev->routes.adapter.adapter_id = css_get_adapter_id( 639 CSS_IO_ADAPTER_VIRTIO, 640 dev->thinint_isc); 641 sch->thinint_active = ((dev->indicators != NULL) && 642 (dev->summary_indicator != NULL)); 643 sch->curr_status.scsw.count = ccw.count - sizeof(thinint); 644 ret = 0; 645 } 646 } 647 break; 648 case CCW_CMD_SET_VIRTIO_REV: 649 len = sizeof(revinfo); 650 if (ccw.count < len) { 651 ret = -EINVAL; 652 break; 653 } 654 if (!ccw.cda) { 655 ret = -EFAULT; 656 break; 657 } 658 ccw_dstream_read_buf(&sch->cds, &revinfo, 4); 659 revinfo.revision = be16_to_cpu(revinfo.revision); 660 revinfo.length = be16_to_cpu(revinfo.length); 661 if (ccw.count < len + revinfo.length || 662 (check_len && ccw.count > len + revinfo.length)) { 663 ret = -EINVAL; 664 break; 665 } 666 /* 667 * Once we start to support revisions with additional data, we'll 668 * need to fetch it here. Nothing to do for now, though. 669 */ 670 if (dev->revision >= 0 || 671 revinfo.revision > virtio_ccw_rev_max(dev) || 672 (dev->force_revision_1 && !revinfo.revision)) { 673 ret = -ENOSYS; 674 break; 675 } 676 ret = 0; 677 dev->revision = revinfo.revision; 678 break; 679 default: 680 ret = -ENOSYS; 681 break; 682 } 683 return ret; 684 } 685 686 static void virtio_sch_disable_cb(SubchDev *sch) 687 { 688 VirtioCcwDevice *dev = sch->driver_data; 689 690 dev->revision = -1; 691 } 692 693 static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) 694 { 695 VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 696 CcwDevice *ccw_dev = CCW_DEVICE(dev); 697 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 698 SubchDev *sch; 699 Error *err = NULL; 700 int i; 701 702 sch = css_create_sch(ccw_dev->devno, errp); 703 if (!sch) { 704 return; 705 } 706 if (!virtio_ccw_rev_max(dev) && dev->force_revision_1) { 707 error_setg(&err, "Invalid value of property max_rev " 708 "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); 709 goto out_err; 710 } 711 712 sch->driver_data = dev; 713 sch->ccw_cb = virtio_ccw_cb; 714 sch->disable_cb = virtio_sch_disable_cb; 715 sch->id.reserved = 0xff; 716 sch->id.cu_type = VIRTIO_CCW_CU_TYPE; 717 sch->do_subchannel_work = do_subchannel_work_virtual; 718 ccw_dev->sch = sch; 719 dev->indicators = NULL; 720 dev->revision = -1; 721 for (i = 0; i < ADAPTER_ROUTES_MAX_GSI; i++) { 722 dev->routes.gsi[i] = -1; 723 } 724 css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE); 725 726 trace_virtio_ccw_new_device( 727 sch->cssid, sch->ssid, sch->schid, sch->devno, 728 ccw_dev->devno.valid ? "user-configured" : "auto-configured"); 729 730 if (kvm_enabled() && !kvm_eventfds_enabled()) { 731 dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; 732 } 733 734 if (k->realize) { 735 k->realize(dev, &err); 736 if (err) { 737 goto out_err; 738 } 739 } 740 741 ck->realize(ccw_dev, &err); 742 if (err) { 743 goto out_err; 744 } 745 746 return; 747 748 out_err: 749 error_propagate(errp, err); 750 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 751 ccw_dev->sch = NULL; 752 g_free(sch); 753 } 754 755 static void virtio_ccw_device_unrealize(VirtioCcwDevice *dev) 756 { 757 VirtIOCCWDeviceClass *dc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 758 CcwDevice *ccw_dev = CCW_DEVICE(dev); 759 SubchDev *sch = ccw_dev->sch; 760 761 if (dc->unrealize) { 762 dc->unrealize(dev); 763 } 764 765 if (sch) { 766 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 767 g_free(sch); 768 ccw_dev->sch = NULL; 769 } 770 if (dev->indicators) { 771 release_indicator(&dev->routes.adapter, dev->indicators); 772 dev->indicators = NULL; 773 } 774 } 775 776 /* DeviceState to VirtioCcwDevice. Note: used on datapath, 777 * be careful and test performance if you change this. 778 */ 779 static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d) 780 { 781 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 782 783 return container_of(ccw_dev, VirtioCcwDevice, parent_obj); 784 } 785 786 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc, 787 uint8_t to_be_set) 788 { 789 uint8_t expected, actual; 790 hwaddr len = 1; 791 /* avoid multiple fetches */ 792 uint8_t volatile *ind_addr; 793 794 ind_addr = cpu_physical_memory_map(ind_loc, &len, true); 795 if (!ind_addr) { 796 error_report("%s(%x.%x.%04x): unable to access indicator", 797 __func__, sch->cssid, sch->ssid, sch->schid); 798 return -1; 799 } 800 actual = *ind_addr; 801 do { 802 expected = actual; 803 actual = atomic_cmpxchg(ind_addr, expected, expected | to_be_set); 804 } while (actual != expected); 805 trace_virtio_ccw_set_ind(ind_loc, actual, actual | to_be_set); 806 cpu_physical_memory_unmap((void *)ind_addr, len, 1, len); 807 808 return actual; 809 } 810 811 static void virtio_ccw_notify(DeviceState *d, uint16_t vector) 812 { 813 VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d); 814 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 815 SubchDev *sch = ccw_dev->sch; 816 uint64_t indicators; 817 818 if (vector == VIRTIO_NO_VECTOR) { 819 return; 820 } 821 /* 822 * vector < VIRTIO_QUEUE_MAX: notification for a virtqueue 823 * vector == VIRTIO_QUEUE_MAX: configuration change notification 824 * bits beyond that are unused and should never be notified for 825 */ 826 assert(vector <= VIRTIO_QUEUE_MAX); 827 828 if (vector < VIRTIO_QUEUE_MAX) { 829 if (!dev->indicators) { 830 return; 831 } 832 if (sch->thinint_active) { 833 /* 834 * In the adapter interrupt case, indicators points to a 835 * memory area that may be (way) larger than 64 bit and 836 * ind_bit indicates the start of the indicators in a big 837 * endian notation. 838 */ 839 uint64_t ind_bit = dev->routes.adapter.ind_offset; 840 841 virtio_set_ind_atomic(sch, dev->indicators->addr + 842 (ind_bit + vector) / 8, 843 0x80 >> ((ind_bit + vector) % 8)); 844 if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr, 845 0x01)) { 846 css_adapter_interrupt(CSS_IO_ADAPTER_VIRTIO, dev->thinint_isc); 847 } 848 } else { 849 assert(vector < NR_CLASSIC_INDICATOR_BITS); 850 indicators = address_space_ldq(&address_space_memory, 851 dev->indicators->addr, 852 MEMTXATTRS_UNSPECIFIED, 853 NULL); 854 indicators |= 1ULL << vector; 855 address_space_stq(&address_space_memory, dev->indicators->addr, 856 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 857 css_conditional_io_interrupt(sch); 858 } 859 } else { 860 if (!dev->indicators2) { 861 return; 862 } 863 indicators = address_space_ldq(&address_space_memory, 864 dev->indicators2->addr, 865 MEMTXATTRS_UNSPECIFIED, 866 NULL); 867 indicators |= 1ULL; 868 address_space_stq(&address_space_memory, dev->indicators2->addr, 869 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 870 css_conditional_io_interrupt(sch); 871 } 872 } 873 874 static void virtio_ccw_reset(DeviceState *d) 875 { 876 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 877 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 878 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 879 880 virtio_ccw_reset_virtio(dev, vdev); 881 if (vdc->parent_reset) { 882 vdc->parent_reset(d); 883 } 884 } 885 886 static void virtio_ccw_vmstate_change(DeviceState *d, bool running) 887 { 888 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 889 890 if (running) { 891 virtio_ccw_start_ioeventfd(dev); 892 } else { 893 virtio_ccw_stop_ioeventfd(dev); 894 } 895 } 896 897 static bool virtio_ccw_query_guest_notifiers(DeviceState *d) 898 { 899 CcwDevice *dev = CCW_DEVICE(d); 900 901 return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA); 902 } 903 904 static int virtio_ccw_get_mappings(VirtioCcwDevice *dev) 905 { 906 int r; 907 CcwDevice *ccw_dev = CCW_DEVICE(dev); 908 909 if (!ccw_dev->sch->thinint_active) { 910 return -EINVAL; 911 } 912 913 r = map_indicator(&dev->routes.adapter, dev->summary_indicator); 914 if (r) { 915 return r; 916 } 917 r = map_indicator(&dev->routes.adapter, dev->indicators); 918 if (r) { 919 return r; 920 } 921 dev->routes.adapter.summary_addr = dev->summary_indicator->map; 922 dev->routes.adapter.ind_addr = dev->indicators->map; 923 924 return 0; 925 } 926 927 static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs) 928 { 929 int i; 930 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 931 int ret; 932 S390FLICState *fs = s390_get_flic(); 933 S390FLICStateClass *fsc = s390_get_flic_class(fs); 934 935 ret = virtio_ccw_get_mappings(dev); 936 if (ret) { 937 return ret; 938 } 939 for (i = 0; i < nvqs; i++) { 940 if (!virtio_queue_get_num(vdev, i)) { 941 break; 942 } 943 } 944 dev->routes.num_routes = i; 945 return fsc->add_adapter_routes(fs, &dev->routes); 946 } 947 948 static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs) 949 { 950 S390FLICState *fs = s390_get_flic(); 951 S390FLICStateClass *fsc = s390_get_flic_class(fs); 952 953 fsc->release_adapter_routes(fs, &dev->routes); 954 } 955 956 static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n) 957 { 958 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 959 VirtQueue *vq = virtio_get_queue(vdev, n); 960 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 961 962 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, notifier, NULL, 963 dev->routes.gsi[n]); 964 } 965 966 static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n) 967 { 968 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 969 VirtQueue *vq = virtio_get_queue(vdev, n); 970 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 971 int ret; 972 973 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, notifier, 974 dev->routes.gsi[n]); 975 assert(ret == 0); 976 } 977 978 static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n, 979 bool assign, bool with_irqfd) 980 { 981 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 982 VirtQueue *vq = virtio_get_queue(vdev, n); 983 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 984 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 985 986 if (assign) { 987 int r = event_notifier_init(notifier, 0); 988 989 if (r < 0) { 990 return r; 991 } 992 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 993 if (with_irqfd) { 994 r = virtio_ccw_add_irqfd(dev, n); 995 if (r) { 996 virtio_queue_set_guest_notifier_fd_handler(vq, false, 997 with_irqfd); 998 return r; 999 } 1000 } 1001 /* 1002 * We do not support individual masking for channel devices, so we 1003 * need to manually trigger any guest masking callbacks here. 1004 */ 1005 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1006 k->guest_notifier_mask(vdev, n, false); 1007 } 1008 /* get lost events and re-inject */ 1009 if (k->guest_notifier_pending && 1010 k->guest_notifier_pending(vdev, n)) { 1011 event_notifier_set(notifier); 1012 } 1013 } else { 1014 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1015 k->guest_notifier_mask(vdev, n, true); 1016 } 1017 if (with_irqfd) { 1018 virtio_ccw_remove_irqfd(dev, n); 1019 } 1020 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 1021 event_notifier_cleanup(notifier); 1022 } 1023 return 0; 1024 } 1025 1026 static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs, 1027 bool assigned) 1028 { 1029 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1030 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1031 CcwDevice *ccw_dev = CCW_DEVICE(d); 1032 bool with_irqfd = ccw_dev->sch->thinint_active && kvm_irqfds_enabled(); 1033 int r, n; 1034 1035 if (with_irqfd && assigned) { 1036 /* irq routes need to be set up before assigning irqfds */ 1037 r = virtio_ccw_setup_irqroutes(dev, nvqs); 1038 if (r < 0) { 1039 goto irqroute_error; 1040 } 1041 } 1042 for (n = 0; n < nvqs; n++) { 1043 if (!virtio_queue_get_num(vdev, n)) { 1044 break; 1045 } 1046 r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd); 1047 if (r < 0) { 1048 goto assign_error; 1049 } 1050 } 1051 if (with_irqfd && !assigned) { 1052 /* release irq routes after irqfds have been released */ 1053 virtio_ccw_release_irqroutes(dev, nvqs); 1054 } 1055 return 0; 1056 1057 assign_error: 1058 while (--n >= 0) { 1059 virtio_ccw_set_guest_notifier(dev, n, !assigned, false); 1060 } 1061 irqroute_error: 1062 if (with_irqfd && assigned) { 1063 virtio_ccw_release_irqroutes(dev, nvqs); 1064 } 1065 return r; 1066 } 1067 1068 static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f) 1069 { 1070 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1071 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1072 1073 qemu_put_be16(f, virtio_queue_vector(vdev, n)); 1074 } 1075 1076 static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f) 1077 { 1078 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1079 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1080 uint16_t vector; 1081 1082 qemu_get_be16s(f, &vector); 1083 virtio_queue_set_vector(vdev, n , vector); 1084 1085 return 0; 1086 } 1087 1088 static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f) 1089 { 1090 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1091 vmstate_save_state(f, &vmstate_virtio_ccw_dev, dev, NULL); 1092 } 1093 1094 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f) 1095 { 1096 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1097 return vmstate_load_state(f, &vmstate_virtio_ccw_dev, dev, 1); 1098 } 1099 1100 static void virtio_ccw_pre_plugged(DeviceState *d, Error **errp) 1101 { 1102 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1103 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1104 1105 if (dev->max_rev >= 1) { 1106 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 1107 } 1108 } 1109 1110 /* This is called by virtio-bus just after the device is plugged. */ 1111 static void virtio_ccw_device_plugged(DeviceState *d, Error **errp) 1112 { 1113 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1114 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1115 CcwDevice *ccw_dev = CCW_DEVICE(d); 1116 SubchDev *sch = ccw_dev->sch; 1117 int n = virtio_get_num_queues(vdev); 1118 S390FLICState *flic = s390_get_flic(); 1119 1120 if (!virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { 1121 dev->max_rev = 0; 1122 } 1123 1124 if (!virtio_ccw_rev_max(dev) && !virtio_legacy_allowed(vdev)) { 1125 error_setg(errp, "Invalid value of property max_rev " 1126 "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); 1127 return; 1128 } 1129 1130 if (virtio_get_num_queues(vdev) > VIRTIO_QUEUE_MAX) { 1131 error_setg(errp, "The number of virtqueues %d " 1132 "exceeds virtio limit %d", n, 1133 VIRTIO_QUEUE_MAX); 1134 return; 1135 } 1136 if (virtio_get_num_queues(vdev) > flic->adapter_routes_max_batch) { 1137 error_setg(errp, "The number of virtqueues %d " 1138 "exceeds flic adapter route limit %d", n, 1139 flic->adapter_routes_max_batch); 1140 return; 1141 } 1142 1143 sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus); 1144 1145 1146 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1147 d->hotplugged, 1); 1148 } 1149 1150 static void virtio_ccw_device_unplugged(DeviceState *d) 1151 { 1152 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1153 1154 virtio_ccw_stop_ioeventfd(dev); 1155 } 1156 /**************** Virtio-ccw Bus Device Descriptions *******************/ 1157 1158 static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp) 1159 { 1160 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1161 1162 virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev); 1163 virtio_ccw_device_realize(_dev, errp); 1164 } 1165 1166 static void virtio_ccw_busdev_unrealize(DeviceState *dev) 1167 { 1168 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1169 1170 virtio_ccw_device_unrealize(_dev); 1171 } 1172 1173 static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev, 1174 DeviceState *dev, Error **errp) 1175 { 1176 VirtioCcwDevice *_dev = to_virtio_ccw_dev_fast(dev); 1177 1178 virtio_ccw_stop_ioeventfd(_dev); 1179 } 1180 1181 static void virtio_ccw_device_class_init(ObjectClass *klass, void *data) 1182 { 1183 DeviceClass *dc = DEVICE_CLASS(klass); 1184 CCWDeviceClass *k = CCW_DEVICE_CLASS(dc); 1185 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_CLASS(klass); 1186 1187 k->unplug = virtio_ccw_busdev_unplug; 1188 dc->realize = virtio_ccw_busdev_realize; 1189 dc->unrealize = virtio_ccw_busdev_unrealize; 1190 dc->bus_type = TYPE_VIRTUAL_CSS_BUS; 1191 device_class_set_parent_reset(dc, virtio_ccw_reset, &vdc->parent_reset); 1192 } 1193 1194 static const TypeInfo virtio_ccw_device_info = { 1195 .name = TYPE_VIRTIO_CCW_DEVICE, 1196 .parent = TYPE_CCW_DEVICE, 1197 .instance_size = sizeof(VirtioCcwDevice), 1198 .class_init = virtio_ccw_device_class_init, 1199 .class_size = sizeof(VirtIOCCWDeviceClass), 1200 .abstract = true, 1201 }; 1202 1203 /* virtio-ccw-bus */ 1204 1205 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 1206 VirtioCcwDevice *dev) 1207 { 1208 DeviceState *qdev = DEVICE(dev); 1209 char virtio_bus_name[] = "virtio-bus"; 1210 1211 qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_CCW_BUS, 1212 qdev, virtio_bus_name); 1213 } 1214 1215 static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data) 1216 { 1217 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 1218 BusClass *bus_class = BUS_CLASS(klass); 1219 1220 bus_class->max_dev = 1; 1221 k->notify = virtio_ccw_notify; 1222 k->vmstate_change = virtio_ccw_vmstate_change; 1223 k->query_guest_notifiers = virtio_ccw_query_guest_notifiers; 1224 k->set_guest_notifiers = virtio_ccw_set_guest_notifiers; 1225 k->save_queue = virtio_ccw_save_queue; 1226 k->load_queue = virtio_ccw_load_queue; 1227 k->save_config = virtio_ccw_save_config; 1228 k->load_config = virtio_ccw_load_config; 1229 k->pre_plugged = virtio_ccw_pre_plugged; 1230 k->device_plugged = virtio_ccw_device_plugged; 1231 k->device_unplugged = virtio_ccw_device_unplugged; 1232 k->ioeventfd_enabled = virtio_ccw_ioeventfd_enabled; 1233 k->ioeventfd_assign = virtio_ccw_ioeventfd_assign; 1234 } 1235 1236 static const TypeInfo virtio_ccw_bus_info = { 1237 .name = TYPE_VIRTIO_CCW_BUS, 1238 .parent = TYPE_VIRTIO_BUS, 1239 .instance_size = sizeof(VirtioCcwBusState), 1240 .class_size = sizeof(VirtioCcwBusClass), 1241 .class_init = virtio_ccw_bus_class_init, 1242 }; 1243 1244 static void virtio_ccw_register(void) 1245 { 1246 type_register_static(&virtio_ccw_bus_info); 1247 type_register_static(&virtio_ccw_device_info); 1248 } 1249 1250 type_init(virtio_ccw_register) 1251