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 "qemu/bitops.h" 21 #include "qemu/error-report.h" 22 #include "qemu/module.h" 23 #include "hw/virtio/virtio-access.h" 24 #include "hw/virtio/virtio-bus.h" 25 #include "hw/s390x/adapter.h" 26 #include "hw/s390x/s390_flic.h" 27 28 #include "hw/s390x/ioinst.h" 29 #include "hw/s390x/css.h" 30 #include "virtio-ccw.h" 31 #include "trace.h" 32 #include "hw/s390x/css-bridge.h" 33 #include "hw/s390x/s390-virtio-ccw.h" 34 35 #define NR_CLASSIC_INDICATOR_BITS 64 36 37 bool have_virtio_ccw = true; 38 39 static int virtio_ccw_dev_post_load(void *opaque, int version_id) 40 { 41 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(opaque); 42 CcwDevice *ccw_dev = CCW_DEVICE(dev); 43 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 44 45 ccw_dev->sch->driver_data = dev; 46 if (ccw_dev->sch->thinint_active) { 47 dev->routes.adapter.adapter_id = css_get_adapter_id( 48 CSS_IO_ADAPTER_VIRTIO, 49 dev->thinint_isc); 50 } 51 /* Re-fill subch_id after loading the subchannel states.*/ 52 if (ck->refill_ids) { 53 ck->refill_ids(ccw_dev); 54 } 55 return 0; 56 } 57 58 typedef struct VirtioCcwDeviceTmp { 59 VirtioCcwDevice *parent; 60 uint16_t config_vector; 61 } VirtioCcwDeviceTmp; 62 63 static int virtio_ccw_dev_tmp_pre_save(void *opaque) 64 { 65 VirtioCcwDeviceTmp *tmp = opaque; 66 VirtioCcwDevice *dev = tmp->parent; 67 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 68 69 tmp->config_vector = vdev->config_vector; 70 71 return 0; 72 } 73 74 static int virtio_ccw_dev_tmp_post_load(void *opaque, int version_id) 75 { 76 VirtioCcwDeviceTmp *tmp = opaque; 77 VirtioCcwDevice *dev = tmp->parent; 78 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 79 80 vdev->config_vector = tmp->config_vector; 81 return 0; 82 } 83 84 const VMStateDescription vmstate_virtio_ccw_dev_tmp = { 85 .name = "s390_virtio_ccw_dev_tmp", 86 .pre_save = virtio_ccw_dev_tmp_pre_save, 87 .post_load = virtio_ccw_dev_tmp_post_load, 88 .fields = (VMStateField[]) { 89 VMSTATE_UINT16(config_vector, VirtioCcwDeviceTmp), 90 VMSTATE_END_OF_LIST() 91 } 92 }; 93 94 const VMStateDescription vmstate_virtio_ccw_dev = { 95 .name = "s390_virtio_ccw_dev", 96 .version_id = 1, 97 .minimum_version_id = 1, 98 .post_load = virtio_ccw_dev_post_load, 99 .fields = (VMStateField[]) { 100 VMSTATE_CCW_DEVICE(parent_obj, VirtioCcwDevice), 101 VMSTATE_PTR_TO_IND_ADDR(indicators, VirtioCcwDevice), 102 VMSTATE_PTR_TO_IND_ADDR(indicators2, VirtioCcwDevice), 103 VMSTATE_PTR_TO_IND_ADDR(summary_indicator, VirtioCcwDevice), 104 /* 105 * Ugly hack because VirtIODevice does not migrate itself. 106 * This also makes legacy via vmstate_save_state possible. 107 */ 108 VMSTATE_WITH_TMP(VirtioCcwDevice, VirtioCcwDeviceTmp, 109 vmstate_virtio_ccw_dev_tmp), 110 VMSTATE_STRUCT(routes, VirtioCcwDevice, 1, vmstate_adapter_routes, 111 AdapterRoutes), 112 VMSTATE_UINT8(thinint_isc, VirtioCcwDevice), 113 VMSTATE_INT32(revision, VirtioCcwDevice), 114 VMSTATE_END_OF_LIST() 115 } 116 }; 117 118 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 119 VirtioCcwDevice *dev); 120 121 VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch) 122 { 123 VirtIODevice *vdev = NULL; 124 VirtioCcwDevice *dev = sch->driver_data; 125 126 if (dev) { 127 vdev = virtio_bus_get_device(&dev->bus); 128 } 129 return vdev; 130 } 131 132 static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev) 133 { 134 virtio_bus_start_ioeventfd(&dev->bus); 135 } 136 137 static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev) 138 { 139 virtio_bus_stop_ioeventfd(&dev->bus); 140 } 141 142 static bool virtio_ccw_ioeventfd_enabled(DeviceState *d) 143 { 144 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 145 146 return (dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) != 0; 147 } 148 149 static int virtio_ccw_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, 150 int n, bool assign) 151 { 152 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 153 CcwDevice *ccw_dev = CCW_DEVICE(dev); 154 SubchDev *sch = ccw_dev->sch; 155 uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid; 156 157 return s390_assign_subch_ioeventfd(notifier, sch_id, n, assign); 158 } 159 160 /* Communication blocks used by several channel commands. */ 161 typedef struct VqInfoBlockLegacy { 162 uint64_t queue; 163 uint32_t align; 164 uint16_t index; 165 uint16_t num; 166 } QEMU_PACKED VqInfoBlockLegacy; 167 168 typedef struct VqInfoBlock { 169 uint64_t desc; 170 uint32_t res0; 171 uint16_t index; 172 uint16_t num; 173 uint64_t avail; 174 uint64_t used; 175 } QEMU_PACKED VqInfoBlock; 176 177 typedef struct VqConfigBlock { 178 uint16_t index; 179 uint16_t num_max; 180 } QEMU_PACKED VqConfigBlock; 181 182 typedef struct VirtioFeatDesc { 183 uint32_t features; 184 uint8_t index; 185 } QEMU_PACKED VirtioFeatDesc; 186 187 typedef struct VirtioThinintInfo { 188 hwaddr summary_indicator; 189 hwaddr device_indicator; 190 uint64_t ind_bit; 191 uint8_t isc; 192 } QEMU_PACKED VirtioThinintInfo; 193 194 typedef struct VirtioRevInfo { 195 uint16_t revision; 196 uint16_t length; 197 uint8_t data[]; 198 } QEMU_PACKED VirtioRevInfo; 199 200 /* Specify where the virtqueues for the subchannel are in guest memory. */ 201 static int virtio_ccw_set_vqs(SubchDev *sch, VqInfoBlock *info, 202 VqInfoBlockLegacy *linfo) 203 { 204 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 205 uint16_t index = info ? info->index : linfo->index; 206 uint16_t num = info ? info->num : linfo->num; 207 uint64_t desc = info ? info->desc : linfo->queue; 208 209 if (index >= VIRTIO_QUEUE_MAX) { 210 return -EINVAL; 211 } 212 213 /* Current code in virtio.c relies on 4K alignment. */ 214 if (linfo && desc && (linfo->align != 4096)) { 215 return -EINVAL; 216 } 217 218 if (!vdev) { 219 return -EINVAL; 220 } 221 222 if (info) { 223 virtio_queue_set_rings(vdev, index, desc, info->avail, info->used); 224 } else { 225 virtio_queue_set_addr(vdev, index, desc); 226 } 227 if (!desc) { 228 virtio_queue_set_vector(vdev, index, VIRTIO_NO_VECTOR); 229 } else { 230 if (info) { 231 /* virtio-1 allows changing the ring size. */ 232 if (virtio_queue_get_max_num(vdev, index) < num) { 233 /* Fail if we exceed the maximum number. */ 234 return -EINVAL; 235 } 236 virtio_queue_set_num(vdev, index, num); 237 } else if (virtio_queue_get_num(vdev, index) > num) { 238 /* Fail if we don't have a big enough queue. */ 239 return -EINVAL; 240 } 241 /* We ignore possible increased num for legacy for compatibility. */ 242 virtio_queue_set_vector(vdev, index, index); 243 } 244 /* tell notify handler in case of config change */ 245 vdev->config_vector = VIRTIO_QUEUE_MAX; 246 return 0; 247 } 248 249 static void virtio_ccw_reset_virtio(VirtioCcwDevice *dev, VirtIODevice *vdev) 250 { 251 CcwDevice *ccw_dev = CCW_DEVICE(dev); 252 253 virtio_ccw_stop_ioeventfd(dev); 254 virtio_reset(vdev); 255 if (dev->indicators) { 256 release_indicator(&dev->routes.adapter, dev->indicators); 257 dev->indicators = NULL; 258 } 259 if (dev->indicators2) { 260 release_indicator(&dev->routes.adapter, dev->indicators2); 261 dev->indicators2 = NULL; 262 } 263 if (dev->summary_indicator) { 264 release_indicator(&dev->routes.adapter, dev->summary_indicator); 265 dev->summary_indicator = NULL; 266 } 267 ccw_dev->sch->thinint_active = false; 268 } 269 270 static int virtio_ccw_handle_set_vq(SubchDev *sch, CCW1 ccw, bool check_len, 271 bool is_legacy) 272 { 273 int ret; 274 VqInfoBlock info; 275 VqInfoBlockLegacy linfo; 276 size_t info_len = is_legacy ? sizeof(linfo) : sizeof(info); 277 278 if (check_len) { 279 if (ccw.count != info_len) { 280 return -EINVAL; 281 } 282 } else if (ccw.count < info_len) { 283 /* Can't execute command. */ 284 return -EINVAL; 285 } 286 if (!ccw.cda) { 287 return -EFAULT; 288 } 289 if (is_legacy) { 290 ret = ccw_dstream_read(&sch->cds, linfo); 291 if (ret) { 292 return ret; 293 } 294 linfo.queue = be64_to_cpu(linfo.queue); 295 linfo.align = be32_to_cpu(linfo.align); 296 linfo.index = be16_to_cpu(linfo.index); 297 linfo.num = be16_to_cpu(linfo.num); 298 ret = virtio_ccw_set_vqs(sch, NULL, &linfo); 299 } else { 300 ret = ccw_dstream_read(&sch->cds, info); 301 if (ret) { 302 return ret; 303 } 304 info.desc = be64_to_cpu(info.desc); 305 info.index = be16_to_cpu(info.index); 306 info.num = be16_to_cpu(info.num); 307 info.avail = be64_to_cpu(info.avail); 308 info.used = be64_to_cpu(info.used); 309 ret = virtio_ccw_set_vqs(sch, &info, NULL); 310 } 311 sch->curr_status.scsw.count = 0; 312 return ret; 313 } 314 315 static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) 316 { 317 int ret; 318 VirtioRevInfo revinfo; 319 uint8_t status; 320 VirtioFeatDesc features; 321 hwaddr indicators; 322 VqConfigBlock vq_config; 323 VirtioCcwDevice *dev = sch->driver_data; 324 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 325 bool check_len; 326 int len; 327 VirtioThinintInfo thinint; 328 329 if (!dev) { 330 return -EINVAL; 331 } 332 333 trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid, 334 ccw.cmd_code); 335 check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); 336 337 if (dev->revision < 0 && ccw.cmd_code != CCW_CMD_SET_VIRTIO_REV) { 338 if (dev->force_revision_1) { 339 /* 340 * virtio-1 drivers must start with negotiating to a revision >= 1, 341 * so post a command reject for all other commands 342 */ 343 return -ENOSYS; 344 } else { 345 /* 346 * If the driver issues any command that is not SET_VIRTIO_REV, 347 * we'll have to operate the device in legacy mode. 348 */ 349 dev->revision = 0; 350 } 351 } 352 353 /* Look at the command. */ 354 switch (ccw.cmd_code) { 355 case CCW_CMD_SET_VQ: 356 ret = virtio_ccw_handle_set_vq(sch, ccw, check_len, dev->revision < 1); 357 break; 358 case CCW_CMD_VDEV_RESET: 359 virtio_ccw_reset_virtio(dev, vdev); 360 ret = 0; 361 break; 362 case CCW_CMD_READ_FEAT: 363 if (check_len) { 364 if (ccw.count != sizeof(features)) { 365 ret = -EINVAL; 366 break; 367 } 368 } else if (ccw.count < sizeof(features)) { 369 /* Can't execute command. */ 370 ret = -EINVAL; 371 break; 372 } 373 if (!ccw.cda) { 374 ret = -EFAULT; 375 } else { 376 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 377 378 ccw_dstream_advance(&sch->cds, sizeof(features.features)); 379 ret = ccw_dstream_read(&sch->cds, features.index); 380 if (ret) { 381 break; 382 } 383 if (features.index == 0) { 384 if (dev->revision >= 1) { 385 /* Don't offer legacy features for modern devices. */ 386 features.features = (uint32_t) 387 (vdev->host_features & ~vdc->legacy_features); 388 } else { 389 features.features = (uint32_t)vdev->host_features; 390 } 391 } else if ((features.index == 1) && (dev->revision >= 1)) { 392 /* 393 * Only offer feature bits beyond 31 if the guest has 394 * negotiated at least revision 1. 395 */ 396 features.features = (uint32_t)(vdev->host_features >> 32); 397 } else { 398 /* Return zeroes if the guest supports more feature bits. */ 399 features.features = 0; 400 } 401 ccw_dstream_rewind(&sch->cds); 402 features.features = cpu_to_le32(features.features); 403 ret = ccw_dstream_write(&sch->cds, features.features); 404 if (!ret) { 405 sch->curr_status.scsw.count = ccw.count - sizeof(features); 406 } 407 } 408 break; 409 case CCW_CMD_WRITE_FEAT: 410 if (check_len) { 411 if (ccw.count != sizeof(features)) { 412 ret = -EINVAL; 413 break; 414 } 415 } else if (ccw.count < sizeof(features)) { 416 /* Can't execute command. */ 417 ret = -EINVAL; 418 break; 419 } 420 if (!ccw.cda) { 421 ret = -EFAULT; 422 } else { 423 ret = ccw_dstream_read(&sch->cds, features); 424 if (ret) { 425 break; 426 } 427 features.features = le32_to_cpu(features.features); 428 if (features.index == 0) { 429 virtio_set_features(vdev, 430 (vdev->guest_features & 0xffffffff00000000ULL) | 431 features.features); 432 } else if ((features.index == 1) && (dev->revision >= 1)) { 433 /* 434 * If the guest did not negotiate at least revision 1, 435 * we did not offer it any feature bits beyond 31. Such a 436 * guest passing us any bit here is therefore buggy. 437 */ 438 virtio_set_features(vdev, 439 (vdev->guest_features & 0x00000000ffffffffULL) | 440 ((uint64_t)features.features << 32)); 441 } else { 442 /* 443 * If the guest supports more feature bits, assert that it 444 * passes us zeroes for those we don't support. 445 */ 446 if (features.features) { 447 qemu_log_mask(LOG_GUEST_ERROR, 448 "Guest bug: features[%i]=%x (expected 0)", 449 features.index, features.features); 450 /* XXX: do a unit check here? */ 451 } 452 } 453 sch->curr_status.scsw.count = ccw.count - sizeof(features); 454 ret = 0; 455 } 456 break; 457 case CCW_CMD_READ_CONF: 458 if (check_len) { 459 if (ccw.count > vdev->config_len) { 460 ret = -EINVAL; 461 break; 462 } 463 } 464 len = MIN(ccw.count, vdev->config_len); 465 if (!ccw.cda) { 466 ret = -EFAULT; 467 } else { 468 virtio_bus_get_vdev_config(&dev->bus, vdev->config); 469 ret = ccw_dstream_write_buf(&sch->cds, vdev->config, len); 470 if (ret) { 471 sch->curr_status.scsw.count = ccw.count - len; 472 } 473 } 474 break; 475 case CCW_CMD_WRITE_CONF: 476 if (check_len) { 477 if (ccw.count > vdev->config_len) { 478 ret = -EINVAL; 479 break; 480 } 481 } 482 len = MIN(ccw.count, vdev->config_len); 483 if (!ccw.cda) { 484 ret = -EFAULT; 485 } else { 486 ret = ccw_dstream_read_buf(&sch->cds, vdev->config, len); 487 if (!ret) { 488 virtio_bus_set_vdev_config(&dev->bus, vdev->config); 489 sch->curr_status.scsw.count = ccw.count - len; 490 } 491 } 492 break; 493 case CCW_CMD_READ_STATUS: 494 if (check_len) { 495 if (ccw.count != sizeof(status)) { 496 ret = -EINVAL; 497 break; 498 } 499 } else if (ccw.count < sizeof(status)) { 500 /* Can't execute command. */ 501 ret = -EINVAL; 502 break; 503 } 504 if (!ccw.cda) { 505 ret = -EFAULT; 506 } else { 507 address_space_stb(&address_space_memory, ccw.cda, vdev->status, 508 MEMTXATTRS_UNSPECIFIED, NULL); 509 sch->curr_status.scsw.count = ccw.count - sizeof(vdev->status); 510 ret = 0; 511 } 512 break; 513 case CCW_CMD_WRITE_STATUS: 514 if (check_len) { 515 if (ccw.count != sizeof(status)) { 516 ret = -EINVAL; 517 break; 518 } 519 } else if (ccw.count < sizeof(status)) { 520 /* Can't execute command. */ 521 ret = -EINVAL; 522 break; 523 } 524 if (!ccw.cda) { 525 ret = -EFAULT; 526 } else { 527 ret = ccw_dstream_read(&sch->cds, status); 528 if (ret) { 529 break; 530 } 531 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { 532 virtio_ccw_stop_ioeventfd(dev); 533 } 534 if (virtio_set_status(vdev, status) == 0) { 535 if (vdev->status == 0) { 536 virtio_ccw_reset_virtio(dev, vdev); 537 } 538 if (status & VIRTIO_CONFIG_S_DRIVER_OK) { 539 virtio_ccw_start_ioeventfd(dev); 540 } 541 sch->curr_status.scsw.count = ccw.count - sizeof(status); 542 ret = 0; 543 } else { 544 /* Trigger a command reject. */ 545 ret = -ENOSYS; 546 } 547 } 548 break; 549 case CCW_CMD_SET_IND: 550 if (check_len) { 551 if (ccw.count != sizeof(indicators)) { 552 ret = -EINVAL; 553 break; 554 } 555 } else if (ccw.count < sizeof(indicators)) { 556 /* Can't execute command. */ 557 ret = -EINVAL; 558 break; 559 } 560 if (sch->thinint_active) { 561 /* Trigger a command reject. */ 562 ret = -ENOSYS; 563 break; 564 } 565 if (virtio_get_num_queues(vdev) > NR_CLASSIC_INDICATOR_BITS) { 566 /* More queues than indicator bits --> trigger a reject */ 567 ret = -ENOSYS; 568 break; 569 } 570 if (!ccw.cda) { 571 ret = -EFAULT; 572 } else { 573 ret = ccw_dstream_read(&sch->cds, indicators); 574 if (ret) { 575 break; 576 } 577 indicators = be64_to_cpu(indicators); 578 dev->indicators = get_indicator(indicators, sizeof(uint64_t)); 579 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 580 ret = 0; 581 } 582 break; 583 case CCW_CMD_SET_CONF_IND: 584 if (check_len) { 585 if (ccw.count != sizeof(indicators)) { 586 ret = -EINVAL; 587 break; 588 } 589 } else if (ccw.count < sizeof(indicators)) { 590 /* Can't execute command. */ 591 ret = -EINVAL; 592 break; 593 } 594 if (!ccw.cda) { 595 ret = -EFAULT; 596 } else { 597 ret = ccw_dstream_read(&sch->cds, indicators); 598 if (ret) { 599 break; 600 } 601 indicators = be64_to_cpu(indicators); 602 dev->indicators2 = get_indicator(indicators, sizeof(uint64_t)); 603 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 604 ret = 0; 605 } 606 break; 607 case CCW_CMD_READ_VQ_CONF: 608 if (check_len) { 609 if (ccw.count != sizeof(vq_config)) { 610 ret = -EINVAL; 611 break; 612 } 613 } else if (ccw.count < sizeof(vq_config)) { 614 /* Can't execute command. */ 615 ret = -EINVAL; 616 break; 617 } 618 if (!ccw.cda) { 619 ret = -EFAULT; 620 } else { 621 ret = ccw_dstream_read(&sch->cds, vq_config.index); 622 if (ret) { 623 break; 624 } 625 vq_config.index = be16_to_cpu(vq_config.index); 626 if (vq_config.index >= VIRTIO_QUEUE_MAX) { 627 ret = -EINVAL; 628 break; 629 } 630 vq_config.num_max = virtio_queue_get_num(vdev, 631 vq_config.index); 632 vq_config.num_max = cpu_to_be16(vq_config.num_max); 633 ret = ccw_dstream_write(&sch->cds, vq_config.num_max); 634 if (!ret) { 635 sch->curr_status.scsw.count = ccw.count - sizeof(vq_config); 636 } 637 } 638 break; 639 case CCW_CMD_SET_IND_ADAPTER: 640 if (check_len) { 641 if (ccw.count != sizeof(thinint)) { 642 ret = -EINVAL; 643 break; 644 } 645 } else if (ccw.count < sizeof(thinint)) { 646 /* Can't execute command. */ 647 ret = -EINVAL; 648 break; 649 } 650 if (!ccw.cda) { 651 ret = -EFAULT; 652 } else if (dev->indicators && !sch->thinint_active) { 653 /* Trigger a command reject. */ 654 ret = -ENOSYS; 655 } else { 656 if (ccw_dstream_read(&sch->cds, thinint)) { 657 ret = -EFAULT; 658 } else { 659 thinint.ind_bit = be64_to_cpu(thinint.ind_bit); 660 thinint.summary_indicator = 661 be64_to_cpu(thinint.summary_indicator); 662 thinint.device_indicator = 663 be64_to_cpu(thinint.device_indicator); 664 665 dev->summary_indicator = 666 get_indicator(thinint.summary_indicator, sizeof(uint8_t)); 667 dev->indicators = 668 get_indicator(thinint.device_indicator, 669 thinint.ind_bit / 8 + 1); 670 dev->thinint_isc = thinint.isc; 671 dev->routes.adapter.ind_offset = thinint.ind_bit; 672 dev->routes.adapter.summary_offset = 7; 673 dev->routes.adapter.adapter_id = css_get_adapter_id( 674 CSS_IO_ADAPTER_VIRTIO, 675 dev->thinint_isc); 676 sch->thinint_active = ((dev->indicators != NULL) && 677 (dev->summary_indicator != NULL)); 678 sch->curr_status.scsw.count = ccw.count - sizeof(thinint); 679 ret = 0; 680 } 681 } 682 break; 683 case CCW_CMD_SET_VIRTIO_REV: 684 len = sizeof(revinfo); 685 if (ccw.count < len) { 686 ret = -EINVAL; 687 break; 688 } 689 if (!ccw.cda) { 690 ret = -EFAULT; 691 break; 692 } 693 ret = ccw_dstream_read_buf(&sch->cds, &revinfo, 4); 694 if (ret < 0) { 695 break; 696 } 697 revinfo.revision = be16_to_cpu(revinfo.revision); 698 revinfo.length = be16_to_cpu(revinfo.length); 699 if (ccw.count < len + revinfo.length || 700 (check_len && ccw.count > len + revinfo.length)) { 701 ret = -EINVAL; 702 break; 703 } 704 /* 705 * Once we start to support revisions with additional data, we'll 706 * need to fetch it here. Nothing to do for now, though. 707 */ 708 if (dev->revision >= 0 || 709 revinfo.revision > virtio_ccw_rev_max(dev) || 710 (dev->force_revision_1 && !revinfo.revision)) { 711 ret = -ENOSYS; 712 break; 713 } 714 ret = 0; 715 dev->revision = revinfo.revision; 716 break; 717 default: 718 ret = -ENOSYS; 719 break; 720 } 721 return ret; 722 } 723 724 static void virtio_sch_disable_cb(SubchDev *sch) 725 { 726 VirtioCcwDevice *dev = sch->driver_data; 727 728 dev->revision = -1; 729 } 730 731 static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) 732 { 733 VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 734 CcwDevice *ccw_dev = CCW_DEVICE(dev); 735 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 736 SubchDev *sch; 737 Error *err = NULL; 738 int i; 739 740 sch = css_create_sch(ccw_dev->devno, errp); 741 if (!sch) { 742 return; 743 } 744 if (!virtio_ccw_rev_max(dev) && dev->force_revision_1) { 745 error_setg(&err, "Invalid value of property max_rev " 746 "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); 747 goto out_err; 748 } 749 750 sch->driver_data = dev; 751 sch->ccw_cb = virtio_ccw_cb; 752 sch->disable_cb = virtio_sch_disable_cb; 753 sch->id.reserved = 0xff; 754 sch->id.cu_type = VIRTIO_CCW_CU_TYPE; 755 sch->do_subchannel_work = do_subchannel_work_virtual; 756 ccw_dev->sch = sch; 757 dev->indicators = NULL; 758 dev->revision = -1; 759 for (i = 0; i < ADAPTER_ROUTES_MAX_GSI; i++) { 760 dev->routes.gsi[i] = -1; 761 } 762 css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE); 763 764 trace_virtio_ccw_new_device( 765 sch->cssid, sch->ssid, sch->schid, sch->devno, 766 ccw_dev->devno.valid ? "user-configured" : "auto-configured"); 767 768 if (kvm_enabled() && !kvm_eventfds_enabled()) { 769 dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; 770 } 771 772 if (k->realize) { 773 k->realize(dev, &err); 774 if (err) { 775 goto out_err; 776 } 777 } 778 779 ck->realize(ccw_dev, &err); 780 if (err) { 781 goto out_err; 782 } 783 784 return; 785 786 out_err: 787 error_propagate(errp, err); 788 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 789 ccw_dev->sch = NULL; 790 g_free(sch); 791 } 792 793 static void virtio_ccw_device_unrealize(VirtioCcwDevice *dev) 794 { 795 VirtIOCCWDeviceClass *dc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 796 CcwDevice *ccw_dev = CCW_DEVICE(dev); 797 SubchDev *sch = ccw_dev->sch; 798 799 if (dc->unrealize) { 800 dc->unrealize(dev); 801 } 802 803 if (sch) { 804 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 805 g_free(sch); 806 ccw_dev->sch = NULL; 807 } 808 if (dev->indicators) { 809 release_indicator(&dev->routes.adapter, dev->indicators); 810 dev->indicators = NULL; 811 } 812 } 813 814 /* DeviceState to VirtioCcwDevice. Note: used on datapath, 815 * be careful and test performance if you change this. 816 */ 817 static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d) 818 { 819 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 820 821 return container_of(ccw_dev, VirtioCcwDevice, parent_obj); 822 } 823 824 static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc, 825 uint8_t to_be_set) 826 { 827 uint8_t expected, actual; 828 hwaddr len = 1; 829 /* avoid multiple fetches */ 830 uint8_t volatile *ind_addr; 831 832 ind_addr = cpu_physical_memory_map(ind_loc, &len, true); 833 if (!ind_addr) { 834 error_report("%s(%x.%x.%04x): unable to access indicator", 835 __func__, sch->cssid, sch->ssid, sch->schid); 836 return -1; 837 } 838 actual = *ind_addr; 839 do { 840 expected = actual; 841 actual = qatomic_cmpxchg(ind_addr, expected, expected | to_be_set); 842 } while (actual != expected); 843 trace_virtio_ccw_set_ind(ind_loc, actual, actual | to_be_set); 844 cpu_physical_memory_unmap((void *)ind_addr, len, 1, len); 845 846 return actual; 847 } 848 849 static void virtio_ccw_notify(DeviceState *d, uint16_t vector) 850 { 851 VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d); 852 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 853 SubchDev *sch = ccw_dev->sch; 854 uint64_t indicators; 855 856 if (vector == VIRTIO_NO_VECTOR) { 857 return; 858 } 859 /* 860 * vector < VIRTIO_QUEUE_MAX: notification for a virtqueue 861 * vector == VIRTIO_QUEUE_MAX: configuration change notification 862 * bits beyond that are unused and should never be notified for 863 */ 864 assert(vector <= VIRTIO_QUEUE_MAX); 865 866 if (vector < VIRTIO_QUEUE_MAX) { 867 if (!dev->indicators) { 868 return; 869 } 870 if (sch->thinint_active) { 871 /* 872 * In the adapter interrupt case, indicators points to a 873 * memory area that may be (way) larger than 64 bit and 874 * ind_bit indicates the start of the indicators in a big 875 * endian notation. 876 */ 877 uint64_t ind_bit = dev->routes.adapter.ind_offset; 878 879 virtio_set_ind_atomic(sch, dev->indicators->addr + 880 (ind_bit + vector) / 8, 881 0x80 >> ((ind_bit + vector) % 8)); 882 if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr, 883 0x01)) { 884 css_adapter_interrupt(CSS_IO_ADAPTER_VIRTIO, dev->thinint_isc); 885 } 886 } else { 887 assert(vector < NR_CLASSIC_INDICATOR_BITS); 888 indicators = address_space_ldq(&address_space_memory, 889 dev->indicators->addr, 890 MEMTXATTRS_UNSPECIFIED, 891 NULL); 892 indicators |= 1ULL << vector; 893 address_space_stq(&address_space_memory, dev->indicators->addr, 894 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 895 css_conditional_io_interrupt(sch); 896 } 897 } else { 898 if (!dev->indicators2) { 899 return; 900 } 901 indicators = address_space_ldq(&address_space_memory, 902 dev->indicators2->addr, 903 MEMTXATTRS_UNSPECIFIED, 904 NULL); 905 indicators |= 1ULL; 906 address_space_stq(&address_space_memory, dev->indicators2->addr, 907 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 908 css_conditional_io_interrupt(sch); 909 } 910 } 911 912 static void virtio_ccw_reset(DeviceState *d) 913 { 914 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 915 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 916 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 917 918 virtio_ccw_reset_virtio(dev, vdev); 919 if (vdc->parent_reset) { 920 vdc->parent_reset(d); 921 } 922 } 923 924 static void virtio_ccw_vmstate_change(DeviceState *d, bool running) 925 { 926 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 927 928 if (running) { 929 virtio_ccw_start_ioeventfd(dev); 930 } else { 931 virtio_ccw_stop_ioeventfd(dev); 932 } 933 } 934 935 static bool virtio_ccw_query_guest_notifiers(DeviceState *d) 936 { 937 CcwDevice *dev = CCW_DEVICE(d); 938 939 return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA); 940 } 941 942 static int virtio_ccw_get_mappings(VirtioCcwDevice *dev) 943 { 944 int r; 945 CcwDevice *ccw_dev = CCW_DEVICE(dev); 946 947 if (!ccw_dev->sch->thinint_active) { 948 return -EINVAL; 949 } 950 951 r = map_indicator(&dev->routes.adapter, dev->summary_indicator); 952 if (r) { 953 return r; 954 } 955 r = map_indicator(&dev->routes.adapter, dev->indicators); 956 if (r) { 957 return r; 958 } 959 dev->routes.adapter.summary_addr = dev->summary_indicator->map; 960 dev->routes.adapter.ind_addr = dev->indicators->map; 961 962 return 0; 963 } 964 965 static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs) 966 { 967 int i; 968 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 969 int ret; 970 S390FLICState *fs = s390_get_flic(); 971 S390FLICStateClass *fsc = s390_get_flic_class(fs); 972 973 ret = virtio_ccw_get_mappings(dev); 974 if (ret) { 975 return ret; 976 } 977 for (i = 0; i < nvqs; i++) { 978 if (!virtio_queue_get_num(vdev, i)) { 979 break; 980 } 981 } 982 dev->routes.num_routes = i; 983 return fsc->add_adapter_routes(fs, &dev->routes); 984 } 985 986 static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs) 987 { 988 S390FLICState *fs = s390_get_flic(); 989 S390FLICStateClass *fsc = s390_get_flic_class(fs); 990 991 fsc->release_adapter_routes(fs, &dev->routes); 992 } 993 994 static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n) 995 { 996 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 997 VirtQueue *vq = virtio_get_queue(vdev, n); 998 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 999 1000 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, notifier, NULL, 1001 dev->routes.gsi[n]); 1002 } 1003 1004 static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n) 1005 { 1006 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1007 VirtQueue *vq = virtio_get_queue(vdev, n); 1008 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 1009 int ret; 1010 1011 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, notifier, 1012 dev->routes.gsi[n]); 1013 assert(ret == 0); 1014 } 1015 1016 static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n, 1017 bool assign, bool with_irqfd) 1018 { 1019 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1020 VirtQueue *vq = virtio_get_queue(vdev, n); 1021 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 1022 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 1023 1024 if (assign) { 1025 int r = event_notifier_init(notifier, 0); 1026 1027 if (r < 0) { 1028 return r; 1029 } 1030 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 1031 if (with_irqfd) { 1032 r = virtio_ccw_add_irqfd(dev, n); 1033 if (r) { 1034 virtio_queue_set_guest_notifier_fd_handler(vq, false, 1035 with_irqfd); 1036 return r; 1037 } 1038 } 1039 /* 1040 * We do not support individual masking for channel devices, so we 1041 * need to manually trigger any guest masking callbacks here. 1042 */ 1043 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1044 k->guest_notifier_mask(vdev, n, false); 1045 } 1046 /* get lost events and re-inject */ 1047 if (k->guest_notifier_pending && 1048 k->guest_notifier_pending(vdev, n)) { 1049 event_notifier_set(notifier); 1050 } 1051 } else { 1052 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1053 k->guest_notifier_mask(vdev, n, true); 1054 } 1055 if (with_irqfd) { 1056 virtio_ccw_remove_irqfd(dev, n); 1057 } 1058 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 1059 event_notifier_cleanup(notifier); 1060 } 1061 return 0; 1062 } 1063 1064 static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs, 1065 bool assigned) 1066 { 1067 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1068 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1069 CcwDevice *ccw_dev = CCW_DEVICE(d); 1070 bool with_irqfd = ccw_dev->sch->thinint_active && kvm_irqfds_enabled(); 1071 int r, n; 1072 1073 if (with_irqfd && assigned) { 1074 /* irq routes need to be set up before assigning irqfds */ 1075 r = virtio_ccw_setup_irqroutes(dev, nvqs); 1076 if (r < 0) { 1077 goto irqroute_error; 1078 } 1079 } 1080 for (n = 0; n < nvqs; n++) { 1081 if (!virtio_queue_get_num(vdev, n)) { 1082 break; 1083 } 1084 r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd); 1085 if (r < 0) { 1086 goto assign_error; 1087 } 1088 } 1089 if (with_irqfd && !assigned) { 1090 /* release irq routes after irqfds have been released */ 1091 virtio_ccw_release_irqroutes(dev, nvqs); 1092 } 1093 return 0; 1094 1095 assign_error: 1096 while (--n >= 0) { 1097 virtio_ccw_set_guest_notifier(dev, n, !assigned, false); 1098 } 1099 irqroute_error: 1100 if (with_irqfd && assigned) { 1101 virtio_ccw_release_irqroutes(dev, nvqs); 1102 } 1103 return r; 1104 } 1105 1106 static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f) 1107 { 1108 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1109 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1110 1111 qemu_put_be16(f, virtio_queue_vector(vdev, n)); 1112 } 1113 1114 static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f) 1115 { 1116 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1117 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1118 uint16_t vector; 1119 1120 qemu_get_be16s(f, &vector); 1121 virtio_queue_set_vector(vdev, n , vector); 1122 1123 return 0; 1124 } 1125 1126 static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f) 1127 { 1128 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1129 vmstate_save_state(f, &vmstate_virtio_ccw_dev, dev, NULL); 1130 } 1131 1132 static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f) 1133 { 1134 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1135 return vmstate_load_state(f, &vmstate_virtio_ccw_dev, dev, 1); 1136 } 1137 1138 static void virtio_ccw_pre_plugged(DeviceState *d, Error **errp) 1139 { 1140 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1141 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1142 1143 if (dev->max_rev >= 1) { 1144 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 1145 } 1146 } 1147 1148 /* This is called by virtio-bus just after the device is plugged. */ 1149 static void virtio_ccw_device_plugged(DeviceState *d, Error **errp) 1150 { 1151 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1152 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1153 CcwDevice *ccw_dev = CCW_DEVICE(d); 1154 SubchDev *sch = ccw_dev->sch; 1155 int n = virtio_get_num_queues(vdev); 1156 S390FLICState *flic = s390_get_flic(); 1157 1158 if (!virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { 1159 dev->max_rev = 0; 1160 } 1161 1162 if (!virtio_ccw_rev_max(dev) && !virtio_legacy_allowed(vdev)) { 1163 /* 1164 * To avoid migration issues, we allow legacy mode when legacy 1165 * check is disabled in the old machine types (< 5.1). 1166 */ 1167 if (virtio_legacy_check_disabled(vdev)) { 1168 warn_report("device requires revision >= 1, but for backward " 1169 "compatibility max_revision=0 is allowed"); 1170 } else { 1171 error_setg(errp, "Invalid value of property max_rev " 1172 "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); 1173 return; 1174 } 1175 } 1176 1177 if (virtio_get_num_queues(vdev) > VIRTIO_QUEUE_MAX) { 1178 error_setg(errp, "The number of virtqueues %d " 1179 "exceeds virtio limit %d", n, 1180 VIRTIO_QUEUE_MAX); 1181 return; 1182 } 1183 if (virtio_get_num_queues(vdev) > flic->adapter_routes_max_batch) { 1184 error_setg(errp, "The number of virtqueues %d " 1185 "exceeds flic adapter route limit %d", n, 1186 flic->adapter_routes_max_batch); 1187 return; 1188 } 1189 1190 sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus); 1191 1192 1193 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1194 d->hotplugged, 1); 1195 } 1196 1197 static void virtio_ccw_device_unplugged(DeviceState *d) 1198 { 1199 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1200 1201 virtio_ccw_stop_ioeventfd(dev); 1202 } 1203 /**************** Virtio-ccw Bus Device Descriptions *******************/ 1204 1205 static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp) 1206 { 1207 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1208 1209 virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev); 1210 virtio_ccw_device_realize(_dev, errp); 1211 } 1212 1213 static void virtio_ccw_busdev_unrealize(DeviceState *dev) 1214 { 1215 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1216 1217 virtio_ccw_device_unrealize(_dev); 1218 } 1219 1220 static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev, 1221 DeviceState *dev, Error **errp) 1222 { 1223 VirtioCcwDevice *_dev = to_virtio_ccw_dev_fast(dev); 1224 1225 virtio_ccw_stop_ioeventfd(_dev); 1226 } 1227 1228 static void virtio_ccw_device_class_init(ObjectClass *klass, void *data) 1229 { 1230 DeviceClass *dc = DEVICE_CLASS(klass); 1231 CCWDeviceClass *k = CCW_DEVICE_CLASS(dc); 1232 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_CLASS(klass); 1233 1234 k->unplug = virtio_ccw_busdev_unplug; 1235 dc->realize = virtio_ccw_busdev_realize; 1236 dc->unrealize = virtio_ccw_busdev_unrealize; 1237 device_class_set_parent_reset(dc, virtio_ccw_reset, &vdc->parent_reset); 1238 } 1239 1240 static const TypeInfo virtio_ccw_device_info = { 1241 .name = TYPE_VIRTIO_CCW_DEVICE, 1242 .parent = TYPE_CCW_DEVICE, 1243 .instance_size = sizeof(VirtioCcwDevice), 1244 .class_init = virtio_ccw_device_class_init, 1245 .class_size = sizeof(VirtIOCCWDeviceClass), 1246 .abstract = true, 1247 }; 1248 1249 /* virtio-ccw-bus */ 1250 1251 static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 1252 VirtioCcwDevice *dev) 1253 { 1254 DeviceState *qdev = DEVICE(dev); 1255 char virtio_bus_name[] = "virtio-bus"; 1256 1257 qbus_create_inplace(bus, bus_size, TYPE_VIRTIO_CCW_BUS, 1258 qdev, virtio_bus_name); 1259 } 1260 1261 static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data) 1262 { 1263 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 1264 BusClass *bus_class = BUS_CLASS(klass); 1265 1266 bus_class->max_dev = 1; 1267 k->notify = virtio_ccw_notify; 1268 k->vmstate_change = virtio_ccw_vmstate_change; 1269 k->query_guest_notifiers = virtio_ccw_query_guest_notifiers; 1270 k->set_guest_notifiers = virtio_ccw_set_guest_notifiers; 1271 k->save_queue = virtio_ccw_save_queue; 1272 k->load_queue = virtio_ccw_load_queue; 1273 k->save_config = virtio_ccw_save_config; 1274 k->load_config = virtio_ccw_load_config; 1275 k->pre_plugged = virtio_ccw_pre_plugged; 1276 k->device_plugged = virtio_ccw_device_plugged; 1277 k->device_unplugged = virtio_ccw_device_unplugged; 1278 k->ioeventfd_enabled = virtio_ccw_ioeventfd_enabled; 1279 k->ioeventfd_assign = virtio_ccw_ioeventfd_assign; 1280 } 1281 1282 static const TypeInfo virtio_ccw_bus_info = { 1283 .name = TYPE_VIRTIO_CCW_BUS, 1284 .parent = TYPE_VIRTIO_BUS, 1285 .instance_size = sizeof(VirtioCcwBusState), 1286 .class_size = sizeof(VirtioCcwBusClass), 1287 .class_init = virtio_ccw_bus_class_init, 1288 }; 1289 1290 static void virtio_ccw_register(void) 1291 { 1292 type_register_static(&virtio_ccw_bus_info); 1293 type_register_static(&virtio_ccw_device_info); 1294 } 1295 1296 type_init(virtio_ccw_register) 1297