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 "exec/address-spaces.h" 16 #include "sysemu/kvm.h" 17 #include "net/net.h" 18 #include "hw/virtio/virtio.h" 19 #include "migration/qemu-file-types.h" 20 #include "hw/virtio/virtio-net.h" 21 #include "qemu/bitops.h" 22 #include "qemu/error-report.h" 23 #include "qemu/log.h" 24 #include "qemu/module.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 #include "sysemu/replay.h" 36 37 #define NR_CLASSIC_INDICATOR_BITS 64 38 39 bool have_virtio_ccw = true; 40 41 static int virtio_ccw_dev_post_load(void *opaque, int version_id) 42 { 43 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(opaque); 44 CcwDevice *ccw_dev = CCW_DEVICE(dev); 45 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 46 47 ccw_dev->sch->driver_data = dev; 48 if (ccw_dev->sch->thinint_active) { 49 dev->routes.adapter.adapter_id = css_get_adapter_id( 50 CSS_IO_ADAPTER_VIRTIO, 51 dev->thinint_isc); 52 } 53 /* Re-fill subch_id after loading the subchannel states.*/ 54 if (ck->refill_ids) { 55 ck->refill_ids(ccw_dev); 56 } 57 return 0; 58 } 59 60 typedef struct VirtioCcwDeviceTmp { 61 VirtioCcwDevice *parent; 62 uint16_t config_vector; 63 } VirtioCcwDeviceTmp; 64 65 static int virtio_ccw_dev_tmp_pre_save(void *opaque) 66 { 67 VirtioCcwDeviceTmp *tmp = opaque; 68 VirtioCcwDevice *dev = tmp->parent; 69 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 70 71 tmp->config_vector = vdev->config_vector; 72 73 return 0; 74 } 75 76 static int virtio_ccw_dev_tmp_post_load(void *opaque, int version_id) 77 { 78 VirtioCcwDeviceTmp *tmp = opaque; 79 VirtioCcwDevice *dev = tmp->parent; 80 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 81 82 vdev->config_vector = tmp->config_vector; 83 return 0; 84 } 85 86 const VMStateDescription vmstate_virtio_ccw_dev_tmp = { 87 .name = "s390_virtio_ccw_dev_tmp", 88 .pre_save = virtio_ccw_dev_tmp_pre_save, 89 .post_load = virtio_ccw_dev_tmp_post_load, 90 .fields = (const VMStateField[]) { 91 VMSTATE_UINT16(config_vector, VirtioCcwDeviceTmp), 92 VMSTATE_END_OF_LIST() 93 } 94 }; 95 96 const VMStateDescription vmstate_virtio_ccw_dev = { 97 .name = "s390_virtio_ccw_dev", 98 .version_id = 1, 99 .minimum_version_id = 1, 100 .post_load = virtio_ccw_dev_post_load, 101 .fields = (const VMStateField[]) { 102 VMSTATE_CCW_DEVICE(parent_obj, VirtioCcwDevice), 103 VMSTATE_PTR_TO_IND_ADDR(indicators, VirtioCcwDevice), 104 VMSTATE_PTR_TO_IND_ADDR(indicators2, VirtioCcwDevice), 105 VMSTATE_PTR_TO_IND_ADDR(summary_indicator, VirtioCcwDevice), 106 /* 107 * Ugly hack because VirtIODevice does not migrate itself. 108 * This also makes legacy via vmstate_save_state possible. 109 */ 110 VMSTATE_WITH_TMP(VirtioCcwDevice, VirtioCcwDeviceTmp, 111 vmstate_virtio_ccw_dev_tmp), 112 VMSTATE_STRUCT(routes, VirtioCcwDevice, 1, vmstate_adapter_routes, 113 AdapterRoutes), 114 VMSTATE_UINT8(thinint_isc, VirtioCcwDevice), 115 VMSTATE_INT32(revision, VirtioCcwDevice), 116 VMSTATE_END_OF_LIST() 117 } 118 }; 119 120 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 121 VirtioCcwDevice *dev); 122 123 VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch) 124 { 125 VirtIODevice *vdev = NULL; 126 VirtioCcwDevice *dev = sch->driver_data; 127 128 if (dev) { 129 vdev = virtio_bus_get_device(&dev->bus); 130 } 131 return vdev; 132 } 133 134 static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev) 135 { 136 virtio_bus_start_ioeventfd(&dev->bus); 137 } 138 139 static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev) 140 { 141 virtio_bus_stop_ioeventfd(&dev->bus); 142 } 143 144 static bool virtio_ccw_ioeventfd_enabled(DeviceState *d) 145 { 146 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 147 148 return (dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) != 0; 149 } 150 151 static int virtio_ccw_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, 152 int n, bool assign) 153 { 154 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 155 CcwDevice *ccw_dev = CCW_DEVICE(dev); 156 SubchDev *sch = ccw_dev->sch; 157 uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid; 158 159 return s390_assign_subch_ioeventfd(notifier, sch_id, n, assign); 160 } 161 162 /* Communication blocks used by several channel commands. */ 163 typedef struct VqInfoBlockLegacy { 164 uint64_t queue; 165 uint32_t align; 166 uint16_t index; 167 uint16_t num; 168 } QEMU_PACKED VqInfoBlockLegacy; 169 170 typedef struct VqInfoBlock { 171 uint64_t desc; 172 uint32_t res0; 173 uint16_t index; 174 uint16_t num; 175 uint64_t avail; 176 uint64_t used; 177 } QEMU_PACKED VqInfoBlock; 178 179 typedef struct VqConfigBlock { 180 uint16_t index; 181 uint16_t num_max; 182 } QEMU_PACKED VqConfigBlock; 183 184 typedef struct VirtioFeatDesc { 185 uint32_t features; 186 uint8_t index; 187 } QEMU_PACKED VirtioFeatDesc; 188 189 typedef struct VirtioThinintInfo { 190 hwaddr summary_indicator; 191 hwaddr device_indicator; 192 uint64_t ind_bit; 193 uint8_t isc; 194 } QEMU_PACKED VirtioThinintInfo; 195 196 typedef struct VirtioRevInfo { 197 uint16_t revision; 198 uint16_t length; 199 uint8_t data[]; 200 } QEMU_PACKED VirtioRevInfo; 201 202 /* Specify where the virtqueues for the subchannel are in guest memory. */ 203 static int virtio_ccw_set_vqs(SubchDev *sch, VqInfoBlock *info, 204 VqInfoBlockLegacy *linfo) 205 { 206 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 207 uint16_t index = info ? info->index : linfo->index; 208 uint16_t num = info ? info->num : linfo->num; 209 uint64_t desc = info ? info->desc : linfo->queue; 210 211 if (index >= VIRTIO_QUEUE_MAX) { 212 return -EINVAL; 213 } 214 215 /* Current code in virtio.c relies on 4K alignment. */ 216 if (linfo && desc && (linfo->align != 4096)) { 217 return -EINVAL; 218 } 219 220 if (!vdev) { 221 return -EINVAL; 222 } 223 224 if (info) { 225 virtio_queue_set_rings(vdev, index, desc, info->avail, info->used); 226 } else { 227 virtio_queue_set_addr(vdev, index, desc); 228 } 229 if (!desc) { 230 virtio_queue_set_vector(vdev, index, VIRTIO_NO_VECTOR); 231 } else { 232 if (info) { 233 /* virtio-1 allows changing the ring size. */ 234 if (virtio_queue_get_max_num(vdev, index) < num) { 235 /* Fail if we exceed the maximum number. */ 236 return -EINVAL; 237 } 238 virtio_queue_set_num(vdev, index, num); 239 virtio_init_region_cache(vdev, index); 240 } else if (virtio_queue_get_num(vdev, index) > num) { 241 /* Fail if we don't have a big enough queue. */ 242 return -EINVAL; 243 } 244 /* We ignore possible increased num for legacy for compatibility. */ 245 virtio_queue_set_vector(vdev, index, index); 246 } 247 /* tell notify handler in case of config change */ 248 vdev->config_vector = VIRTIO_QUEUE_MAX; 249 return 0; 250 } 251 252 static void virtio_ccw_reset_virtio(VirtioCcwDevice *dev) 253 { 254 CcwDevice *ccw_dev = CCW_DEVICE(dev); 255 256 virtio_bus_reset(&dev->bus); 257 if (dev->indicators) { 258 release_indicator(&dev->routes.adapter, dev->indicators); 259 dev->indicators = NULL; 260 } 261 if (dev->indicators2) { 262 release_indicator(&dev->routes.adapter, dev->indicators2); 263 dev->indicators2 = NULL; 264 } 265 if (dev->summary_indicator) { 266 release_indicator(&dev->routes.adapter, dev->summary_indicator); 267 dev->summary_indicator = NULL; 268 } 269 ccw_dev->sch->thinint_active = false; 270 } 271 272 static int virtio_ccw_handle_set_vq(SubchDev *sch, CCW1 ccw, bool check_len, 273 bool is_legacy) 274 { 275 int ret; 276 VqInfoBlock info; 277 VqInfoBlockLegacy linfo; 278 size_t info_len = is_legacy ? sizeof(linfo) : sizeof(info); 279 280 if (check_len) { 281 if (ccw.count != info_len) { 282 return -EINVAL; 283 } 284 } else if (ccw.count < info_len) { 285 /* Can't execute command. */ 286 return -EINVAL; 287 } 288 if (!ccw.cda) { 289 return -EFAULT; 290 } 291 if (is_legacy) { 292 ret = ccw_dstream_read(&sch->cds, linfo); 293 if (ret) { 294 return ret; 295 } 296 linfo.queue = be64_to_cpu(linfo.queue); 297 linfo.align = be32_to_cpu(linfo.align); 298 linfo.index = be16_to_cpu(linfo.index); 299 linfo.num = be16_to_cpu(linfo.num); 300 ret = virtio_ccw_set_vqs(sch, NULL, &linfo); 301 } else { 302 ret = ccw_dstream_read(&sch->cds, info); 303 if (ret) { 304 return ret; 305 } 306 info.desc = be64_to_cpu(info.desc); 307 info.index = be16_to_cpu(info.index); 308 info.num = be16_to_cpu(info.num); 309 info.avail = be64_to_cpu(info.avail); 310 info.used = be64_to_cpu(info.used); 311 ret = virtio_ccw_set_vqs(sch, &info, NULL); 312 } 313 sch->curr_status.scsw.count = 0; 314 return ret; 315 } 316 317 static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) 318 { 319 int ret; 320 VirtioRevInfo revinfo; 321 uint8_t status; 322 VirtioFeatDesc features; 323 hwaddr indicators; 324 VqConfigBlock vq_config; 325 VirtioCcwDevice *dev = sch->driver_data; 326 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 327 bool check_len; 328 int len; 329 VirtioThinintInfo thinint; 330 331 if (!dev) { 332 return -EINVAL; 333 } 334 335 trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid, 336 ccw.cmd_code); 337 check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); 338 339 if (dev->revision < 0 && ccw.cmd_code != CCW_CMD_SET_VIRTIO_REV) { 340 if (dev->force_revision_1) { 341 /* 342 * virtio-1 drivers must start with negotiating to a revision >= 1, 343 * so post a command reject for all other commands 344 */ 345 return -ENOSYS; 346 } else { 347 /* 348 * If the driver issues any command that is not SET_VIRTIO_REV, 349 * we'll have to operate the device in legacy mode. 350 */ 351 dev->revision = 0; 352 } 353 } 354 355 /* Look at the command. */ 356 switch (ccw.cmd_code) { 357 case CCW_CMD_SET_VQ: 358 ret = virtio_ccw_handle_set_vq(sch, ccw, check_len, dev->revision < 1); 359 break; 360 case CCW_CMD_VDEV_RESET: 361 virtio_ccw_reset_virtio(dev); 362 ret = 0; 363 break; 364 case CCW_CMD_READ_FEAT: 365 if (check_len) { 366 if (ccw.count != sizeof(features)) { 367 ret = -EINVAL; 368 break; 369 } 370 } else if (ccw.count < sizeof(features)) { 371 /* Can't execute command. */ 372 ret = -EINVAL; 373 break; 374 } 375 if (!ccw.cda) { 376 ret = -EFAULT; 377 } else { 378 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 379 380 ccw_dstream_advance(&sch->cds, sizeof(features.features)); 381 ret = ccw_dstream_read(&sch->cds, features.index); 382 if (ret) { 383 break; 384 } 385 if (features.index == 0) { 386 if (dev->revision >= 1) { 387 /* Don't offer legacy features for modern devices. */ 388 features.features = (uint32_t) 389 (vdev->host_features & ~vdc->legacy_features); 390 } else { 391 features.features = (uint32_t)vdev->host_features; 392 } 393 } else if ((features.index == 1) && (dev->revision >= 1)) { 394 /* 395 * Only offer feature bits beyond 31 if the guest has 396 * negotiated at least revision 1. 397 */ 398 features.features = (uint32_t)(vdev->host_features >> 32); 399 } else { 400 /* Return zeroes if the guest supports more feature bits. */ 401 features.features = 0; 402 } 403 ccw_dstream_rewind(&sch->cds); 404 features.features = cpu_to_le32(features.features); 405 ret = ccw_dstream_write(&sch->cds, features.features); 406 if (!ret) { 407 sch->curr_status.scsw.count = ccw.count - sizeof(features); 408 } 409 } 410 break; 411 case CCW_CMD_WRITE_FEAT: 412 if (check_len) { 413 if (ccw.count != sizeof(features)) { 414 ret = -EINVAL; 415 break; 416 } 417 } else if (ccw.count < sizeof(features)) { 418 /* Can't execute command. */ 419 ret = -EINVAL; 420 break; 421 } 422 if (!ccw.cda) { 423 ret = -EFAULT; 424 } else { 425 ret = ccw_dstream_read(&sch->cds, features); 426 if (ret) { 427 break; 428 } 429 features.features = le32_to_cpu(features.features); 430 if (features.index == 0) { 431 virtio_set_features(vdev, 432 (vdev->guest_features & 0xffffffff00000000ULL) | 433 features.features); 434 } else if ((features.index == 1) && (dev->revision >= 1)) { 435 /* 436 * If the guest did not negotiate at least revision 1, 437 * we did not offer it any feature bits beyond 31. Such a 438 * guest passing us any bit here is therefore buggy. 439 */ 440 virtio_set_features(vdev, 441 (vdev->guest_features & 0x00000000ffffffffULL) | 442 ((uint64_t)features.features << 32)); 443 } else { 444 /* 445 * If the guest supports more feature bits, assert that it 446 * passes us zeroes for those we don't support. 447 */ 448 if (features.features) { 449 qemu_log_mask(LOG_GUEST_ERROR, 450 "Guest bug: features[%i]=%x (expected 0)", 451 features.index, features.features); 452 /* XXX: do a unit check here? */ 453 } 454 } 455 sch->curr_status.scsw.count = ccw.count - sizeof(features); 456 ret = 0; 457 } 458 break; 459 case CCW_CMD_READ_CONF: 460 if (check_len) { 461 if (ccw.count > vdev->config_len) { 462 ret = -EINVAL; 463 break; 464 } 465 } 466 len = MIN(ccw.count, vdev->config_len); 467 if (!ccw.cda) { 468 ret = -EFAULT; 469 } else { 470 virtio_bus_get_vdev_config(&dev->bus, vdev->config); 471 ret = ccw_dstream_write_buf(&sch->cds, vdev->config, len); 472 if (ret) { 473 sch->curr_status.scsw.count = ccw.count - len; 474 } 475 } 476 break; 477 case CCW_CMD_WRITE_CONF: 478 if (check_len) { 479 if (ccw.count > vdev->config_len) { 480 ret = -EINVAL; 481 break; 482 } 483 } 484 len = MIN(ccw.count, vdev->config_len); 485 if (!ccw.cda) { 486 ret = -EFAULT; 487 } else { 488 ret = ccw_dstream_read_buf(&sch->cds, vdev->config, len); 489 if (!ret) { 490 virtio_bus_set_vdev_config(&dev->bus, vdev->config); 491 sch->curr_status.scsw.count = ccw.count - len; 492 } 493 } 494 break; 495 case CCW_CMD_READ_STATUS: 496 if (check_len) { 497 if (ccw.count != sizeof(status)) { 498 ret = -EINVAL; 499 break; 500 } 501 } else if (ccw.count < sizeof(status)) { 502 /* Can't execute command. */ 503 ret = -EINVAL; 504 break; 505 } 506 if (!ccw.cda) { 507 ret = -EFAULT; 508 } else { 509 address_space_stb(&address_space_memory, ccw.cda, vdev->status, 510 MEMTXATTRS_UNSPECIFIED, NULL); 511 sch->curr_status.scsw.count = ccw.count - sizeof(vdev->status); 512 ret = 0; 513 } 514 break; 515 case CCW_CMD_WRITE_STATUS: 516 if (check_len) { 517 if (ccw.count != sizeof(status)) { 518 ret = -EINVAL; 519 break; 520 } 521 } else if (ccw.count < sizeof(status)) { 522 /* Can't execute command. */ 523 ret = -EINVAL; 524 break; 525 } 526 if (!ccw.cda) { 527 ret = -EFAULT; 528 } else { 529 ret = ccw_dstream_read(&sch->cds, status); 530 if (ret) { 531 break; 532 } 533 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { 534 virtio_ccw_stop_ioeventfd(dev); 535 } 536 if (virtio_set_status(vdev, status) == 0) { 537 if (vdev->status == 0) { 538 virtio_ccw_reset_virtio(dev); 539 } 540 if (status & VIRTIO_CONFIG_S_DRIVER_OK) { 541 virtio_ccw_start_ioeventfd(dev); 542 } 543 sch->curr_status.scsw.count = ccw.count - sizeof(status); 544 ret = 0; 545 } else { 546 /* Trigger a command reject. */ 547 ret = -ENOSYS; 548 } 549 } 550 break; 551 case CCW_CMD_SET_IND: 552 if (check_len) { 553 if (ccw.count != sizeof(indicators)) { 554 ret = -EINVAL; 555 break; 556 } 557 } else if (ccw.count < sizeof(indicators)) { 558 /* Can't execute command. */ 559 ret = -EINVAL; 560 break; 561 } 562 if (sch->thinint_active) { 563 /* Trigger a command reject. */ 564 ret = -ENOSYS; 565 break; 566 } 567 if (virtio_get_num_queues(vdev) > NR_CLASSIC_INDICATOR_BITS) { 568 /* More queues than indicator bits --> trigger a reject */ 569 ret = -ENOSYS; 570 break; 571 } 572 if (!ccw.cda) { 573 ret = -EFAULT; 574 } else { 575 ret = ccw_dstream_read(&sch->cds, indicators); 576 if (ret) { 577 break; 578 } 579 indicators = be64_to_cpu(indicators); 580 dev->indicators = get_indicator(indicators, sizeof(uint64_t)); 581 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 582 ret = 0; 583 } 584 break; 585 case CCW_CMD_SET_CONF_IND: 586 if (check_len) { 587 if (ccw.count != sizeof(indicators)) { 588 ret = -EINVAL; 589 break; 590 } 591 } else if (ccw.count < sizeof(indicators)) { 592 /* Can't execute command. */ 593 ret = -EINVAL; 594 break; 595 } 596 if (!ccw.cda) { 597 ret = -EFAULT; 598 } else { 599 ret = ccw_dstream_read(&sch->cds, indicators); 600 if (ret) { 601 break; 602 } 603 indicators = be64_to_cpu(indicators); 604 dev->indicators2 = get_indicator(indicators, sizeof(uint64_t)); 605 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 606 ret = 0; 607 } 608 break; 609 case CCW_CMD_READ_VQ_CONF: 610 if (check_len) { 611 if (ccw.count != sizeof(vq_config)) { 612 ret = -EINVAL; 613 break; 614 } 615 } else if (ccw.count < sizeof(vq_config)) { 616 /* Can't execute command. */ 617 ret = -EINVAL; 618 break; 619 } 620 if (!ccw.cda) { 621 ret = -EFAULT; 622 } else { 623 ret = ccw_dstream_read(&sch->cds, vq_config.index); 624 if (ret) { 625 break; 626 } 627 vq_config.index = be16_to_cpu(vq_config.index); 628 if (vq_config.index >= VIRTIO_QUEUE_MAX) { 629 ret = -EINVAL; 630 break; 631 } 632 vq_config.num_max = virtio_queue_get_num(vdev, 633 vq_config.index); 634 vq_config.num_max = cpu_to_be16(vq_config.num_max); 635 ret = ccw_dstream_write(&sch->cds, vq_config.num_max); 636 if (!ret) { 637 sch->curr_status.scsw.count = ccw.count - sizeof(vq_config); 638 } 639 } 640 break; 641 case CCW_CMD_SET_IND_ADAPTER: 642 if (check_len) { 643 if (ccw.count != sizeof(thinint)) { 644 ret = -EINVAL; 645 break; 646 } 647 } else if (ccw.count < sizeof(thinint)) { 648 /* Can't execute command. */ 649 ret = -EINVAL; 650 break; 651 } 652 if (!ccw.cda) { 653 ret = -EFAULT; 654 } else if (dev->indicators && !sch->thinint_active) { 655 /* Trigger a command reject. */ 656 ret = -ENOSYS; 657 } else { 658 if (ccw_dstream_read(&sch->cds, thinint)) { 659 ret = -EFAULT; 660 } else { 661 thinint.ind_bit = be64_to_cpu(thinint.ind_bit); 662 thinint.summary_indicator = 663 be64_to_cpu(thinint.summary_indicator); 664 thinint.device_indicator = 665 be64_to_cpu(thinint.device_indicator); 666 667 dev->summary_indicator = 668 get_indicator(thinint.summary_indicator, sizeof(uint8_t)); 669 dev->indicators = 670 get_indicator(thinint.device_indicator, 671 thinint.ind_bit / 8 + 1); 672 dev->thinint_isc = thinint.isc; 673 dev->routes.adapter.ind_offset = thinint.ind_bit; 674 dev->routes.adapter.summary_offset = 7; 675 dev->routes.adapter.adapter_id = css_get_adapter_id( 676 CSS_IO_ADAPTER_VIRTIO, 677 dev->thinint_isc); 678 sch->thinint_active = ((dev->indicators != NULL) && 679 (dev->summary_indicator != NULL)); 680 sch->curr_status.scsw.count = ccw.count - sizeof(thinint); 681 ret = 0; 682 } 683 } 684 break; 685 case CCW_CMD_SET_VIRTIO_REV: 686 len = sizeof(revinfo); 687 if (ccw.count < len) { 688 ret = -EINVAL; 689 break; 690 } 691 if (!ccw.cda) { 692 ret = -EFAULT; 693 break; 694 } 695 ret = ccw_dstream_read_buf(&sch->cds, &revinfo, 4); 696 if (ret < 0) { 697 break; 698 } 699 revinfo.revision = be16_to_cpu(revinfo.revision); 700 revinfo.length = be16_to_cpu(revinfo.length); 701 if (ccw.count < len + revinfo.length || 702 (check_len && ccw.count > len + revinfo.length)) { 703 ret = -EINVAL; 704 break; 705 } 706 /* 707 * Once we start to support revisions with additional data, we'll 708 * need to fetch it here. Nothing to do for now, though. 709 */ 710 if (dev->revision >= 0 || 711 revinfo.revision > virtio_ccw_rev_max(dev) || 712 (dev->force_revision_1 && !revinfo.revision)) { 713 ret = -ENOSYS; 714 break; 715 } 716 ret = 0; 717 dev->revision = revinfo.revision; 718 break; 719 default: 720 ret = -ENOSYS; 721 break; 722 } 723 return ret; 724 } 725 726 static void virtio_sch_disable_cb(SubchDev *sch) 727 { 728 VirtioCcwDevice *dev = sch->driver_data; 729 730 dev->revision = -1; 731 } 732 733 static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) 734 { 735 VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 736 CcwDevice *ccw_dev = CCW_DEVICE(dev); 737 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 738 SubchDev *sch; 739 Error *err = NULL; 740 int i; 741 742 sch = css_create_sch(ccw_dev->devno, errp); 743 if (!sch) { 744 return; 745 } 746 if (!virtio_ccw_rev_max(dev) && dev->force_revision_1) { 747 error_setg(&err, "Invalid value of property max_rev " 748 "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); 749 goto out_err; 750 } 751 752 sch->driver_data = dev; 753 sch->ccw_cb = virtio_ccw_cb; 754 sch->disable_cb = virtio_sch_disable_cb; 755 sch->id.reserved = 0xff; 756 sch->id.cu_type = VIRTIO_CCW_CU_TYPE; 757 sch->do_subchannel_work = do_subchannel_work_virtual; 758 sch->irb_cb = build_irb_virtual; 759 ccw_dev->sch = sch; 760 dev->indicators = NULL; 761 dev->revision = -1; 762 for (i = 0; i < ADAPTER_ROUTES_MAX_GSI; i++) { 763 dev->routes.gsi[i] = -1; 764 } 765 css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE); 766 767 trace_virtio_ccw_new_device( 768 sch->cssid, sch->ssid, sch->schid, sch->devno, 769 ccw_dev->devno.valid ? "user-configured" : "auto-configured"); 770 771 /* fd-based ioevents can't be synchronized in record/replay */ 772 if (replay_mode != REPLAY_MODE_NONE) { 773 dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; 774 } 775 776 if (k->realize) { 777 k->realize(dev, &err); 778 if (err) { 779 goto out_err; 780 } 781 } 782 783 ck->realize(ccw_dev, &err); 784 if (err) { 785 goto out_err; 786 } 787 788 return; 789 790 out_err: 791 error_propagate(errp, err); 792 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 793 ccw_dev->sch = NULL; 794 g_free(sch); 795 } 796 797 static void virtio_ccw_device_unrealize(VirtioCcwDevice *dev) 798 { 799 VirtIOCCWDeviceClass *dc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 800 CcwDevice *ccw_dev = CCW_DEVICE(dev); 801 SubchDev *sch = ccw_dev->sch; 802 803 if (dc->unrealize) { 804 dc->unrealize(dev); 805 } 806 807 if (sch) { 808 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 809 g_free(sch); 810 ccw_dev->sch = NULL; 811 } 812 if (dev->indicators) { 813 release_indicator(&dev->routes.adapter, dev->indicators); 814 dev->indicators = NULL; 815 } 816 } 817 818 /* DeviceState to VirtioCcwDevice. Note: used on datapath, 819 * be careful and test performance if you change this. 820 */ 821 static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d) 822 { 823 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 824 825 return container_of(ccw_dev, VirtioCcwDevice, parent_obj); 826 } 827 828 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc, 829 uint8_t to_be_set) 830 { 831 uint8_t expected, actual; 832 hwaddr len = 1; 833 /* avoid multiple fetches */ 834 uint8_t volatile *ind_addr; 835 836 ind_addr = cpu_physical_memory_map(ind_loc, &len, true); 837 if (!ind_addr) { 838 error_report("%s(%x.%x.%04x): unable to access indicator", 839 __func__, sch->cssid, sch->ssid, sch->schid); 840 return -1; 841 } 842 actual = *ind_addr; 843 do { 844 expected = actual; 845 actual = qatomic_cmpxchg(ind_addr, expected, expected | to_be_set); 846 } while (actual != expected); 847 trace_virtio_ccw_set_ind(ind_loc, actual, actual | to_be_set); 848 cpu_physical_memory_unmap((void *)ind_addr, len, 1, len); 849 850 return actual; 851 } 852 853 static void virtio_ccw_notify(DeviceState *d, uint16_t vector) 854 { 855 VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d); 856 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 857 SubchDev *sch = ccw_dev->sch; 858 uint64_t indicators; 859 860 if (vector == VIRTIO_NO_VECTOR) { 861 return; 862 } 863 /* 864 * vector < VIRTIO_QUEUE_MAX: notification for a virtqueue 865 * vector == VIRTIO_QUEUE_MAX: configuration change notification 866 * bits beyond that are unused and should never be notified for 867 */ 868 assert(vector <= VIRTIO_QUEUE_MAX); 869 870 if (vector < VIRTIO_QUEUE_MAX) { 871 if (!dev->indicators) { 872 return; 873 } 874 if (sch->thinint_active) { 875 /* 876 * In the adapter interrupt case, indicators points to a 877 * memory area that may be (way) larger than 64 bit and 878 * ind_bit indicates the start of the indicators in a big 879 * endian notation. 880 */ 881 uint64_t ind_bit = dev->routes.adapter.ind_offset; 882 883 virtio_set_ind_atomic(sch, dev->indicators->addr + 884 (ind_bit + vector) / 8, 885 0x80 >> ((ind_bit + vector) % 8)); 886 if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr, 887 0x01)) { 888 css_adapter_interrupt(CSS_IO_ADAPTER_VIRTIO, dev->thinint_isc); 889 } 890 } else { 891 assert(vector < NR_CLASSIC_INDICATOR_BITS); 892 indicators = address_space_ldq(&address_space_memory, 893 dev->indicators->addr, 894 MEMTXATTRS_UNSPECIFIED, 895 NULL); 896 indicators |= 1ULL << vector; 897 address_space_stq(&address_space_memory, dev->indicators->addr, 898 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 899 css_conditional_io_interrupt(sch); 900 } 901 } else { 902 if (!dev->indicators2) { 903 return; 904 } 905 indicators = address_space_ldq(&address_space_memory, 906 dev->indicators2->addr, 907 MEMTXATTRS_UNSPECIFIED, 908 NULL); 909 indicators |= 1ULL; 910 address_space_stq(&address_space_memory, dev->indicators2->addr, 911 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 912 css_conditional_io_interrupt(sch); 913 } 914 } 915 916 static void virtio_ccw_reset(DeviceState *d) 917 { 918 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 919 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 920 921 virtio_ccw_reset_virtio(dev); 922 if (vdc->parent_reset) { 923 vdc->parent_reset(d); 924 } 925 } 926 927 static void virtio_ccw_vmstate_change(DeviceState *d, bool running) 928 { 929 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 930 931 if (running) { 932 virtio_ccw_start_ioeventfd(dev); 933 } else { 934 virtio_ccw_stop_ioeventfd(dev); 935 } 936 } 937 938 static bool virtio_ccw_query_guest_notifiers(DeviceState *d) 939 { 940 CcwDevice *dev = CCW_DEVICE(d); 941 942 return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA); 943 } 944 945 static int virtio_ccw_get_mappings(VirtioCcwDevice *dev) 946 { 947 int r; 948 CcwDevice *ccw_dev = CCW_DEVICE(dev); 949 950 if (!ccw_dev->sch->thinint_active) { 951 return -EINVAL; 952 } 953 954 r = map_indicator(&dev->routes.adapter, dev->summary_indicator); 955 if (r) { 956 return r; 957 } 958 r = map_indicator(&dev->routes.adapter, dev->indicators); 959 if (r) { 960 return r; 961 } 962 dev->routes.adapter.summary_addr = dev->summary_indicator->map; 963 dev->routes.adapter.ind_addr = dev->indicators->map; 964 965 return 0; 966 } 967 968 static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs) 969 { 970 int i; 971 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 972 int ret; 973 S390FLICState *fs = s390_get_flic(); 974 S390FLICStateClass *fsc = s390_get_flic_class(fs); 975 976 ret = virtio_ccw_get_mappings(dev); 977 if (ret) { 978 return ret; 979 } 980 for (i = 0; i < nvqs; i++) { 981 if (!virtio_queue_get_num(vdev, i)) { 982 break; 983 } 984 } 985 dev->routes.num_routes = i; 986 return fsc->add_adapter_routes(fs, &dev->routes); 987 } 988 989 static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs) 990 { 991 S390FLICState *fs = s390_get_flic(); 992 S390FLICStateClass *fsc = s390_get_flic_class(fs); 993 994 fsc->release_adapter_routes(fs, &dev->routes); 995 } 996 997 static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n) 998 { 999 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1000 VirtQueue *vq = virtio_get_queue(vdev, n); 1001 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 1002 1003 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, notifier, NULL, 1004 dev->routes.gsi[n]); 1005 } 1006 1007 static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n) 1008 { 1009 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1010 VirtQueue *vq = virtio_get_queue(vdev, n); 1011 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 1012 int ret; 1013 1014 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, notifier, 1015 dev->routes.gsi[n]); 1016 assert(ret == 0); 1017 } 1018 1019 static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n, 1020 bool assign, bool with_irqfd) 1021 { 1022 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1023 VirtQueue *vq = virtio_get_queue(vdev, n); 1024 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 1025 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 1026 1027 if (assign) { 1028 int r = event_notifier_init(notifier, 0); 1029 1030 if (r < 0) { 1031 return r; 1032 } 1033 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 1034 if (with_irqfd) { 1035 r = virtio_ccw_add_irqfd(dev, n); 1036 if (r) { 1037 virtio_queue_set_guest_notifier_fd_handler(vq, false, 1038 with_irqfd); 1039 return r; 1040 } 1041 } 1042 /* 1043 * We do not support individual masking for channel devices, so we 1044 * need to manually trigger any guest masking callbacks here. 1045 */ 1046 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1047 k->guest_notifier_mask(vdev, n, false); 1048 } 1049 /* get lost events and re-inject */ 1050 if (k->guest_notifier_pending && 1051 k->guest_notifier_pending(vdev, n)) { 1052 event_notifier_set(notifier); 1053 } 1054 } else { 1055 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1056 k->guest_notifier_mask(vdev, n, true); 1057 } 1058 if (with_irqfd) { 1059 virtio_ccw_remove_irqfd(dev, n); 1060 } 1061 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 1062 event_notifier_cleanup(notifier); 1063 } 1064 return 0; 1065 } 1066 1067 static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs, 1068 bool assigned) 1069 { 1070 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1071 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1072 CcwDevice *ccw_dev = CCW_DEVICE(d); 1073 bool with_irqfd = ccw_dev->sch->thinint_active && kvm_irqfds_enabled(); 1074 int r, n; 1075 1076 if (with_irqfd && assigned) { 1077 /* irq routes need to be set up before assigning irqfds */ 1078 r = virtio_ccw_setup_irqroutes(dev, nvqs); 1079 if (r < 0) { 1080 goto irqroute_error; 1081 } 1082 } 1083 for (n = 0; n < nvqs; n++) { 1084 if (!virtio_queue_get_num(vdev, n)) { 1085 break; 1086 } 1087 r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd); 1088 if (r < 0) { 1089 goto assign_error; 1090 } 1091 } 1092 if (with_irqfd && !assigned) { 1093 /* release irq routes after irqfds have been released */ 1094 virtio_ccw_release_irqroutes(dev, nvqs); 1095 } 1096 return 0; 1097 1098 assign_error: 1099 while (--n >= 0) { 1100 virtio_ccw_set_guest_notifier(dev, n, !assigned, false); 1101 } 1102 irqroute_error: 1103 if (with_irqfd && assigned) { 1104 virtio_ccw_release_irqroutes(dev, nvqs); 1105 } 1106 return r; 1107 } 1108 1109 static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f) 1110 { 1111 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1112 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1113 1114 qemu_put_be16(f, virtio_queue_vector(vdev, n)); 1115 } 1116 1117 static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f) 1118 { 1119 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1120 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1121 uint16_t vector; 1122 1123 qemu_get_be16s(f, &vector); 1124 virtio_queue_set_vector(vdev, n , vector); 1125 1126 return 0; 1127 } 1128 1129 static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f) 1130 { 1131 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1132 vmstate_save_state(f, &vmstate_virtio_ccw_dev, dev, NULL); 1133 } 1134 1135 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f) 1136 { 1137 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1138 return vmstate_load_state(f, &vmstate_virtio_ccw_dev, dev, 1); 1139 } 1140 1141 static void virtio_ccw_pre_plugged(DeviceState *d, Error **errp) 1142 { 1143 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1144 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1145 1146 if (dev->max_rev >= 1) { 1147 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 1148 } 1149 } 1150 1151 /* This is called by virtio-bus just after the device is plugged. */ 1152 static void virtio_ccw_device_plugged(DeviceState *d, Error **errp) 1153 { 1154 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1155 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1156 CcwDevice *ccw_dev = CCW_DEVICE(d); 1157 SubchDev *sch = ccw_dev->sch; 1158 int n = virtio_get_num_queues(vdev); 1159 S390FLICState *flic = s390_get_flic(); 1160 1161 if (!virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { 1162 dev->max_rev = 0; 1163 } 1164 1165 if (!virtio_ccw_rev_max(dev) && !virtio_legacy_allowed(vdev)) { 1166 /* 1167 * To avoid migration issues, we allow legacy mode when legacy 1168 * check is disabled in the old machine types (< 5.1). 1169 */ 1170 if (virtio_legacy_check_disabled(vdev)) { 1171 warn_report("device requires revision >= 1, but for backward " 1172 "compatibility max_revision=0 is allowed"); 1173 } else { 1174 error_setg(errp, "Invalid value of property max_rev " 1175 "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); 1176 return; 1177 } 1178 } 1179 1180 if (virtio_get_num_queues(vdev) > VIRTIO_QUEUE_MAX) { 1181 error_setg(errp, "The number of virtqueues %d " 1182 "exceeds virtio limit %d", n, 1183 VIRTIO_QUEUE_MAX); 1184 return; 1185 } 1186 if (virtio_get_num_queues(vdev) > flic->adapter_routes_max_batch) { 1187 error_setg(errp, "The number of virtqueues %d " 1188 "exceeds flic adapter route limit %d", n, 1189 flic->adapter_routes_max_batch); 1190 return; 1191 } 1192 1193 sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus); 1194 1195 1196 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1197 d->hotplugged, 1); 1198 } 1199 1200 static void virtio_ccw_device_unplugged(DeviceState *d) 1201 { 1202 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1203 1204 virtio_ccw_stop_ioeventfd(dev); 1205 } 1206 /**************** Virtio-ccw Bus Device Descriptions *******************/ 1207 1208 static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp) 1209 { 1210 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1211 1212 virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev); 1213 virtio_ccw_device_realize(_dev, errp); 1214 } 1215 1216 static void virtio_ccw_busdev_unrealize(DeviceState *dev) 1217 { 1218 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1219 1220 virtio_ccw_device_unrealize(_dev); 1221 } 1222 1223 static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev, 1224 DeviceState *dev, Error **errp) 1225 { 1226 VirtioCcwDevice *_dev = to_virtio_ccw_dev_fast(dev); 1227 1228 virtio_ccw_stop_ioeventfd(_dev); 1229 } 1230 1231 static void virtio_ccw_device_class_init(ObjectClass *klass, void *data) 1232 { 1233 DeviceClass *dc = DEVICE_CLASS(klass); 1234 CCWDeviceClass *k = CCW_DEVICE_CLASS(dc); 1235 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_CLASS(klass); 1236 1237 k->unplug = virtio_ccw_busdev_unplug; 1238 dc->realize = virtio_ccw_busdev_realize; 1239 dc->unrealize = virtio_ccw_busdev_unrealize; 1240 device_class_set_parent_reset(dc, virtio_ccw_reset, &vdc->parent_reset); 1241 } 1242 1243 static const TypeInfo virtio_ccw_device_info = { 1244 .name = TYPE_VIRTIO_CCW_DEVICE, 1245 .parent = TYPE_CCW_DEVICE, 1246 .instance_size = sizeof(VirtioCcwDevice), 1247 .class_init = virtio_ccw_device_class_init, 1248 .class_size = sizeof(VirtIOCCWDeviceClass), 1249 .abstract = true, 1250 }; 1251 1252 /* virtio-ccw-bus */ 1253 1254 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 1255 VirtioCcwDevice *dev) 1256 { 1257 DeviceState *qdev = DEVICE(dev); 1258 char virtio_bus_name[] = "virtio-bus"; 1259 1260 qbus_init(bus, bus_size, TYPE_VIRTIO_CCW_BUS, qdev, virtio_bus_name); 1261 } 1262 1263 static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data) 1264 { 1265 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 1266 BusClass *bus_class = BUS_CLASS(klass); 1267 1268 bus_class->max_dev = 1; 1269 k->notify = virtio_ccw_notify; 1270 k->vmstate_change = virtio_ccw_vmstate_change; 1271 k->query_guest_notifiers = virtio_ccw_query_guest_notifiers; 1272 k->set_guest_notifiers = virtio_ccw_set_guest_notifiers; 1273 k->save_queue = virtio_ccw_save_queue; 1274 k->load_queue = virtio_ccw_load_queue; 1275 k->save_config = virtio_ccw_save_config; 1276 k->load_config = virtio_ccw_load_config; 1277 k->pre_plugged = virtio_ccw_pre_plugged; 1278 k->device_plugged = virtio_ccw_device_plugged; 1279 k->device_unplugged = virtio_ccw_device_unplugged; 1280 k->ioeventfd_enabled = virtio_ccw_ioeventfd_enabled; 1281 k->ioeventfd_assign = virtio_ccw_ioeventfd_assign; 1282 } 1283 1284 static const TypeInfo virtio_ccw_bus_info = { 1285 .name = TYPE_VIRTIO_CCW_BUS, 1286 .parent = TYPE_VIRTIO_BUS, 1287 .instance_size = sizeof(VirtioCcwBusState), 1288 .class_size = sizeof(VirtioCcwBusClass), 1289 .class_init = virtio_ccw_bus_class_init, 1290 }; 1291 1292 static void virtio_ccw_register(void) 1293 { 1294 type_register_static(&virtio_ccw_bus_info); 1295 type_register_static(&virtio_ccw_device_info); 1296 } 1297 1298 type_init(virtio_ccw_register) 1299