virtio-ccw.c (41402B)
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#include "sysemu/replay.h" 35 36#define NR_CLASSIC_INDICATOR_BITS 64 37 38bool have_virtio_ccw = true; 39 40static int virtio_ccw_dev_post_load(void *opaque, int version_id) 41{ 42 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(opaque); 43 CcwDevice *ccw_dev = CCW_DEVICE(dev); 44 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 45 46 ccw_dev->sch->driver_data = dev; 47 if (ccw_dev->sch->thinint_active) { 48 dev->routes.adapter.adapter_id = css_get_adapter_id( 49 CSS_IO_ADAPTER_VIRTIO, 50 dev->thinint_isc); 51 } 52 /* Re-fill subch_id after loading the subchannel states.*/ 53 if (ck->refill_ids) { 54 ck->refill_ids(ccw_dev); 55 } 56 return 0; 57} 58 59typedef struct VirtioCcwDeviceTmp { 60 VirtioCcwDevice *parent; 61 uint16_t config_vector; 62} VirtioCcwDeviceTmp; 63 64static int virtio_ccw_dev_tmp_pre_save(void *opaque) 65{ 66 VirtioCcwDeviceTmp *tmp = opaque; 67 VirtioCcwDevice *dev = tmp->parent; 68 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 69 70 tmp->config_vector = vdev->config_vector; 71 72 return 0; 73} 74 75static int virtio_ccw_dev_tmp_post_load(void *opaque, int version_id) 76{ 77 VirtioCcwDeviceTmp *tmp = opaque; 78 VirtioCcwDevice *dev = tmp->parent; 79 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 80 81 vdev->config_vector = tmp->config_vector; 82 return 0; 83} 84 85const VMStateDescription vmstate_virtio_ccw_dev_tmp = { 86 .name = "s390_virtio_ccw_dev_tmp", 87 .pre_save = virtio_ccw_dev_tmp_pre_save, 88 .post_load = virtio_ccw_dev_tmp_post_load, 89 .fields = (VMStateField[]) { 90 VMSTATE_UINT16(config_vector, VirtioCcwDeviceTmp), 91 VMSTATE_END_OF_LIST() 92 } 93}; 94 95const VMStateDescription vmstate_virtio_ccw_dev = { 96 .name = "s390_virtio_ccw_dev", 97 .version_id = 1, 98 .minimum_version_id = 1, 99 .post_load = virtio_ccw_dev_post_load, 100 .fields = (VMStateField[]) { 101 VMSTATE_CCW_DEVICE(parent_obj, VirtioCcwDevice), 102 VMSTATE_PTR_TO_IND_ADDR(indicators, VirtioCcwDevice), 103 VMSTATE_PTR_TO_IND_ADDR(indicators2, VirtioCcwDevice), 104 VMSTATE_PTR_TO_IND_ADDR(summary_indicator, VirtioCcwDevice), 105 /* 106 * Ugly hack because VirtIODevice does not migrate itself. 107 * This also makes legacy via vmstate_save_state possible. 108 */ 109 VMSTATE_WITH_TMP(VirtioCcwDevice, VirtioCcwDeviceTmp, 110 vmstate_virtio_ccw_dev_tmp), 111 VMSTATE_STRUCT(routes, VirtioCcwDevice, 1, vmstate_adapter_routes, 112 AdapterRoutes), 113 VMSTATE_UINT8(thinint_isc, VirtioCcwDevice), 114 VMSTATE_INT32(revision, VirtioCcwDevice), 115 VMSTATE_END_OF_LIST() 116 } 117}; 118 119static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 120 VirtioCcwDevice *dev); 121 122VirtIODevice *virtio_ccw_get_vdev(SubchDev *sch) 123{ 124 VirtIODevice *vdev = NULL; 125 VirtioCcwDevice *dev = sch->driver_data; 126 127 if (dev) { 128 vdev = virtio_bus_get_device(&dev->bus); 129 } 130 return vdev; 131} 132 133static void virtio_ccw_start_ioeventfd(VirtioCcwDevice *dev) 134{ 135 virtio_bus_start_ioeventfd(&dev->bus); 136} 137 138static void virtio_ccw_stop_ioeventfd(VirtioCcwDevice *dev) 139{ 140 virtio_bus_stop_ioeventfd(&dev->bus); 141} 142 143static bool virtio_ccw_ioeventfd_enabled(DeviceState *d) 144{ 145 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 146 147 return (dev->flags & VIRTIO_CCW_FLAG_USE_IOEVENTFD) != 0; 148} 149 150static int virtio_ccw_ioeventfd_assign(DeviceState *d, EventNotifier *notifier, 151 int n, bool assign) 152{ 153 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 154 CcwDevice *ccw_dev = CCW_DEVICE(dev); 155 SubchDev *sch = ccw_dev->sch; 156 uint32_t sch_id = (css_build_subchannel_id(sch) << 16) | sch->schid; 157 158 return s390_assign_subch_ioeventfd(notifier, sch_id, n, assign); 159} 160 161/* Communication blocks used by several channel commands. */ 162typedef struct VqInfoBlockLegacy { 163 uint64_t queue; 164 uint32_t align; 165 uint16_t index; 166 uint16_t num; 167} QEMU_PACKED VqInfoBlockLegacy; 168 169typedef struct VqInfoBlock { 170 uint64_t desc; 171 uint32_t res0; 172 uint16_t index; 173 uint16_t num; 174 uint64_t avail; 175 uint64_t used; 176} QEMU_PACKED VqInfoBlock; 177 178typedef struct VqConfigBlock { 179 uint16_t index; 180 uint16_t num_max; 181} QEMU_PACKED VqConfigBlock; 182 183typedef struct VirtioFeatDesc { 184 uint32_t features; 185 uint8_t index; 186} QEMU_PACKED VirtioFeatDesc; 187 188typedef struct VirtioThinintInfo { 189 hwaddr summary_indicator; 190 hwaddr device_indicator; 191 uint64_t ind_bit; 192 uint8_t isc; 193} QEMU_PACKED VirtioThinintInfo; 194 195typedef struct VirtioRevInfo { 196 uint16_t revision; 197 uint16_t length; 198 uint8_t data[]; 199} QEMU_PACKED VirtioRevInfo; 200 201/* Specify where the virtqueues for the subchannel are in guest memory. */ 202static int virtio_ccw_set_vqs(SubchDev *sch, VqInfoBlock *info, 203 VqInfoBlockLegacy *linfo) 204{ 205 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 206 uint16_t index = info ? info->index : linfo->index; 207 uint16_t num = info ? info->num : linfo->num; 208 uint64_t desc = info ? info->desc : linfo->queue; 209 210 if (index >= VIRTIO_QUEUE_MAX) { 211 return -EINVAL; 212 } 213 214 /* Current code in virtio.c relies on 4K alignment. */ 215 if (linfo && desc && (linfo->align != 4096)) { 216 return -EINVAL; 217 } 218 219 if (!vdev) { 220 return -EINVAL; 221 } 222 223 if (info) { 224 virtio_queue_set_rings(vdev, index, desc, info->avail, info->used); 225 } else { 226 virtio_queue_set_addr(vdev, index, desc); 227 } 228 if (!desc) { 229 virtio_queue_set_vector(vdev, index, VIRTIO_NO_VECTOR); 230 } else { 231 if (info) { 232 /* virtio-1 allows changing the ring size. */ 233 if (virtio_queue_get_max_num(vdev, index) < num) { 234 /* Fail if we exceed the maximum number. */ 235 return -EINVAL; 236 } 237 virtio_queue_set_num(vdev, index, num); 238 } else if (virtio_queue_get_num(vdev, index) > num) { 239 /* Fail if we don't have a big enough queue. */ 240 return -EINVAL; 241 } 242 /* We ignore possible increased num for legacy for compatibility. */ 243 virtio_queue_set_vector(vdev, index, index); 244 } 245 /* tell notify handler in case of config change */ 246 vdev->config_vector = VIRTIO_QUEUE_MAX; 247 return 0; 248} 249 250static void virtio_ccw_reset_virtio(VirtioCcwDevice *dev, VirtIODevice *vdev) 251{ 252 CcwDevice *ccw_dev = CCW_DEVICE(dev); 253 254 virtio_ccw_stop_ioeventfd(dev); 255 virtio_reset(vdev); 256 if (dev->indicators) { 257 release_indicator(&dev->routes.adapter, dev->indicators); 258 dev->indicators = NULL; 259 } 260 if (dev->indicators2) { 261 release_indicator(&dev->routes.adapter, dev->indicators2); 262 dev->indicators2 = NULL; 263 } 264 if (dev->summary_indicator) { 265 release_indicator(&dev->routes.adapter, dev->summary_indicator); 266 dev->summary_indicator = NULL; 267 } 268 ccw_dev->sch->thinint_active = false; 269} 270 271static int virtio_ccw_handle_set_vq(SubchDev *sch, CCW1 ccw, bool check_len, 272 bool is_legacy) 273{ 274 int ret; 275 VqInfoBlock info; 276 VqInfoBlockLegacy linfo; 277 size_t info_len = is_legacy ? sizeof(linfo) : sizeof(info); 278 279 if (check_len) { 280 if (ccw.count != info_len) { 281 return -EINVAL; 282 } 283 } else if (ccw.count < info_len) { 284 /* Can't execute command. */ 285 return -EINVAL; 286 } 287 if (!ccw.cda) { 288 return -EFAULT; 289 } 290 if (is_legacy) { 291 ret = ccw_dstream_read(&sch->cds, linfo); 292 if (ret) { 293 return ret; 294 } 295 linfo.queue = be64_to_cpu(linfo.queue); 296 linfo.align = be32_to_cpu(linfo.align); 297 linfo.index = be16_to_cpu(linfo.index); 298 linfo.num = be16_to_cpu(linfo.num); 299 ret = virtio_ccw_set_vqs(sch, NULL, &linfo); 300 } else { 301 ret = ccw_dstream_read(&sch->cds, info); 302 if (ret) { 303 return ret; 304 } 305 info.desc = be64_to_cpu(info.desc); 306 info.index = be16_to_cpu(info.index); 307 info.num = be16_to_cpu(info.num); 308 info.avail = be64_to_cpu(info.avail); 309 info.used = be64_to_cpu(info.used); 310 ret = virtio_ccw_set_vqs(sch, &info, NULL); 311 } 312 sch->curr_status.scsw.count = 0; 313 return ret; 314} 315 316static int virtio_ccw_cb(SubchDev *sch, CCW1 ccw) 317{ 318 int ret; 319 VirtioRevInfo revinfo; 320 uint8_t status; 321 VirtioFeatDesc features; 322 hwaddr indicators; 323 VqConfigBlock vq_config; 324 VirtioCcwDevice *dev = sch->driver_data; 325 VirtIODevice *vdev = virtio_ccw_get_vdev(sch); 326 bool check_len; 327 int len; 328 VirtioThinintInfo thinint; 329 330 if (!dev) { 331 return -EINVAL; 332 } 333 334 trace_virtio_ccw_interpret_ccw(sch->cssid, sch->ssid, sch->schid, 335 ccw.cmd_code); 336 check_len = !((ccw.flags & CCW_FLAG_SLI) && !(ccw.flags & CCW_FLAG_DC)); 337 338 if (dev->revision < 0 && ccw.cmd_code != CCW_CMD_SET_VIRTIO_REV) { 339 if (dev->force_revision_1) { 340 /* 341 * virtio-1 drivers must start with negotiating to a revision >= 1, 342 * so post a command reject for all other commands 343 */ 344 return -ENOSYS; 345 } else { 346 /* 347 * If the driver issues any command that is not SET_VIRTIO_REV, 348 * we'll have to operate the device in legacy mode. 349 */ 350 dev->revision = 0; 351 } 352 } 353 354 /* Look at the command. */ 355 switch (ccw.cmd_code) { 356 case CCW_CMD_SET_VQ: 357 ret = virtio_ccw_handle_set_vq(sch, ccw, check_len, dev->revision < 1); 358 break; 359 case CCW_CMD_VDEV_RESET: 360 virtio_ccw_reset_virtio(dev, vdev); 361 ret = 0; 362 break; 363 case CCW_CMD_READ_FEAT: 364 if (check_len) { 365 if (ccw.count != sizeof(features)) { 366 ret = -EINVAL; 367 break; 368 } 369 } else if (ccw.count < sizeof(features)) { 370 /* Can't execute command. */ 371 ret = -EINVAL; 372 break; 373 } 374 if (!ccw.cda) { 375 ret = -EFAULT; 376 } else { 377 VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev); 378 379 ccw_dstream_advance(&sch->cds, sizeof(features.features)); 380 ret = ccw_dstream_read(&sch->cds, features.index); 381 if (ret) { 382 break; 383 } 384 if (features.index == 0) { 385 if (dev->revision >= 1) { 386 /* Don't offer legacy features for modern devices. */ 387 features.features = (uint32_t) 388 (vdev->host_features & ~vdc->legacy_features); 389 } else { 390 features.features = (uint32_t)vdev->host_features; 391 } 392 } else if ((features.index == 1) && (dev->revision >= 1)) { 393 /* 394 * Only offer feature bits beyond 31 if the guest has 395 * negotiated at least revision 1. 396 */ 397 features.features = (uint32_t)(vdev->host_features >> 32); 398 } else { 399 /* Return zeroes if the guest supports more feature bits. */ 400 features.features = 0; 401 } 402 ccw_dstream_rewind(&sch->cds); 403 features.features = cpu_to_le32(features.features); 404 ret = ccw_dstream_write(&sch->cds, features.features); 405 if (!ret) { 406 sch->curr_status.scsw.count = ccw.count - sizeof(features); 407 } 408 } 409 break; 410 case CCW_CMD_WRITE_FEAT: 411 if (check_len) { 412 if (ccw.count != sizeof(features)) { 413 ret = -EINVAL; 414 break; 415 } 416 } else if (ccw.count < sizeof(features)) { 417 /* Can't execute command. */ 418 ret = -EINVAL; 419 break; 420 } 421 if (!ccw.cda) { 422 ret = -EFAULT; 423 } else { 424 ret = ccw_dstream_read(&sch->cds, features); 425 if (ret) { 426 break; 427 } 428 features.features = le32_to_cpu(features.features); 429 if (features.index == 0) { 430 virtio_set_features(vdev, 431 (vdev->guest_features & 0xffffffff00000000ULL) | 432 features.features); 433 } else if ((features.index == 1) && (dev->revision >= 1)) { 434 /* 435 * If the guest did not negotiate at least revision 1, 436 * we did not offer it any feature bits beyond 31. Such a 437 * guest passing us any bit here is therefore buggy. 438 */ 439 virtio_set_features(vdev, 440 (vdev->guest_features & 0x00000000ffffffffULL) | 441 ((uint64_t)features.features << 32)); 442 } else { 443 /* 444 * If the guest supports more feature bits, assert that it 445 * passes us zeroes for those we don't support. 446 */ 447 if (features.features) { 448 qemu_log_mask(LOG_GUEST_ERROR, 449 "Guest bug: features[%i]=%x (expected 0)", 450 features.index, features.features); 451 /* XXX: do a unit check here? */ 452 } 453 } 454 sch->curr_status.scsw.count = ccw.count - sizeof(features); 455 ret = 0; 456 } 457 break; 458 case CCW_CMD_READ_CONF: 459 if (check_len) { 460 if (ccw.count > vdev->config_len) { 461 ret = -EINVAL; 462 break; 463 } 464 } 465 len = MIN(ccw.count, vdev->config_len); 466 if (!ccw.cda) { 467 ret = -EFAULT; 468 } else { 469 virtio_bus_get_vdev_config(&dev->bus, vdev->config); 470 ret = ccw_dstream_write_buf(&sch->cds, vdev->config, len); 471 if (ret) { 472 sch->curr_status.scsw.count = ccw.count - len; 473 } 474 } 475 break; 476 case CCW_CMD_WRITE_CONF: 477 if (check_len) { 478 if (ccw.count > vdev->config_len) { 479 ret = -EINVAL; 480 break; 481 } 482 } 483 len = MIN(ccw.count, vdev->config_len); 484 if (!ccw.cda) { 485 ret = -EFAULT; 486 } else { 487 ret = ccw_dstream_read_buf(&sch->cds, vdev->config, len); 488 if (!ret) { 489 virtio_bus_set_vdev_config(&dev->bus, vdev->config); 490 sch->curr_status.scsw.count = ccw.count - len; 491 } 492 } 493 break; 494 case CCW_CMD_READ_STATUS: 495 if (check_len) { 496 if (ccw.count != sizeof(status)) { 497 ret = -EINVAL; 498 break; 499 } 500 } else if (ccw.count < sizeof(status)) { 501 /* Can't execute command. */ 502 ret = -EINVAL; 503 break; 504 } 505 if (!ccw.cda) { 506 ret = -EFAULT; 507 } else { 508 address_space_stb(&address_space_memory, ccw.cda, vdev->status, 509 MEMTXATTRS_UNSPECIFIED, NULL); 510 sch->curr_status.scsw.count = ccw.count - sizeof(vdev->status); 511 ret = 0; 512 } 513 break; 514 case CCW_CMD_WRITE_STATUS: 515 if (check_len) { 516 if (ccw.count != sizeof(status)) { 517 ret = -EINVAL; 518 break; 519 } 520 } else if (ccw.count < sizeof(status)) { 521 /* Can't execute command. */ 522 ret = -EINVAL; 523 break; 524 } 525 if (!ccw.cda) { 526 ret = -EFAULT; 527 } else { 528 ret = ccw_dstream_read(&sch->cds, status); 529 if (ret) { 530 break; 531 } 532 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { 533 virtio_ccw_stop_ioeventfd(dev); 534 } 535 if (virtio_set_status(vdev, status) == 0) { 536 if (vdev->status == 0) { 537 virtio_ccw_reset_virtio(dev, vdev); 538 } 539 if (status & VIRTIO_CONFIG_S_DRIVER_OK) { 540 virtio_ccw_start_ioeventfd(dev); 541 } 542 sch->curr_status.scsw.count = ccw.count - sizeof(status); 543 ret = 0; 544 } else { 545 /* Trigger a command reject. */ 546 ret = -ENOSYS; 547 } 548 } 549 break; 550 case CCW_CMD_SET_IND: 551 if (check_len) { 552 if (ccw.count != sizeof(indicators)) { 553 ret = -EINVAL; 554 break; 555 } 556 } else if (ccw.count < sizeof(indicators)) { 557 /* Can't execute command. */ 558 ret = -EINVAL; 559 break; 560 } 561 if (sch->thinint_active) { 562 /* Trigger a command reject. */ 563 ret = -ENOSYS; 564 break; 565 } 566 if (virtio_get_num_queues(vdev) > NR_CLASSIC_INDICATOR_BITS) { 567 /* More queues than indicator bits --> trigger a reject */ 568 ret = -ENOSYS; 569 break; 570 } 571 if (!ccw.cda) { 572 ret = -EFAULT; 573 } else { 574 ret = ccw_dstream_read(&sch->cds, indicators); 575 if (ret) { 576 break; 577 } 578 indicators = be64_to_cpu(indicators); 579 dev->indicators = get_indicator(indicators, sizeof(uint64_t)); 580 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 581 ret = 0; 582 } 583 break; 584 case CCW_CMD_SET_CONF_IND: 585 if (check_len) { 586 if (ccw.count != sizeof(indicators)) { 587 ret = -EINVAL; 588 break; 589 } 590 } else if (ccw.count < sizeof(indicators)) { 591 /* Can't execute command. */ 592 ret = -EINVAL; 593 break; 594 } 595 if (!ccw.cda) { 596 ret = -EFAULT; 597 } else { 598 ret = ccw_dstream_read(&sch->cds, indicators); 599 if (ret) { 600 break; 601 } 602 indicators = be64_to_cpu(indicators); 603 dev->indicators2 = get_indicator(indicators, sizeof(uint64_t)); 604 sch->curr_status.scsw.count = ccw.count - sizeof(indicators); 605 ret = 0; 606 } 607 break; 608 case CCW_CMD_READ_VQ_CONF: 609 if (check_len) { 610 if (ccw.count != sizeof(vq_config)) { 611 ret = -EINVAL; 612 break; 613 } 614 } else if (ccw.count < sizeof(vq_config)) { 615 /* Can't execute command. */ 616 ret = -EINVAL; 617 break; 618 } 619 if (!ccw.cda) { 620 ret = -EFAULT; 621 } else { 622 ret = ccw_dstream_read(&sch->cds, vq_config.index); 623 if (ret) { 624 break; 625 } 626 vq_config.index = be16_to_cpu(vq_config.index); 627 if (vq_config.index >= VIRTIO_QUEUE_MAX) { 628 ret = -EINVAL; 629 break; 630 } 631 vq_config.num_max = virtio_queue_get_num(vdev, 632 vq_config.index); 633 vq_config.num_max = cpu_to_be16(vq_config.num_max); 634 ret = ccw_dstream_write(&sch->cds, vq_config.num_max); 635 if (!ret) { 636 sch->curr_status.scsw.count = ccw.count - sizeof(vq_config); 637 } 638 } 639 break; 640 case CCW_CMD_SET_IND_ADAPTER: 641 if (check_len) { 642 if (ccw.count != sizeof(thinint)) { 643 ret = -EINVAL; 644 break; 645 } 646 } else if (ccw.count < sizeof(thinint)) { 647 /* Can't execute command. */ 648 ret = -EINVAL; 649 break; 650 } 651 if (!ccw.cda) { 652 ret = -EFAULT; 653 } else if (dev->indicators && !sch->thinint_active) { 654 /* Trigger a command reject. */ 655 ret = -ENOSYS; 656 } else { 657 if (ccw_dstream_read(&sch->cds, thinint)) { 658 ret = -EFAULT; 659 } else { 660 thinint.ind_bit = be64_to_cpu(thinint.ind_bit); 661 thinint.summary_indicator = 662 be64_to_cpu(thinint.summary_indicator); 663 thinint.device_indicator = 664 be64_to_cpu(thinint.device_indicator); 665 666 dev->summary_indicator = 667 get_indicator(thinint.summary_indicator, sizeof(uint8_t)); 668 dev->indicators = 669 get_indicator(thinint.device_indicator, 670 thinint.ind_bit / 8 + 1); 671 dev->thinint_isc = thinint.isc; 672 dev->routes.adapter.ind_offset = thinint.ind_bit; 673 dev->routes.adapter.summary_offset = 7; 674 dev->routes.adapter.adapter_id = css_get_adapter_id( 675 CSS_IO_ADAPTER_VIRTIO, 676 dev->thinint_isc); 677 sch->thinint_active = ((dev->indicators != NULL) && 678 (dev->summary_indicator != NULL)); 679 sch->curr_status.scsw.count = ccw.count - sizeof(thinint); 680 ret = 0; 681 } 682 } 683 break; 684 case CCW_CMD_SET_VIRTIO_REV: 685 len = sizeof(revinfo); 686 if (ccw.count < len) { 687 ret = -EINVAL; 688 break; 689 } 690 if (!ccw.cda) { 691 ret = -EFAULT; 692 break; 693 } 694 ret = ccw_dstream_read_buf(&sch->cds, &revinfo, 4); 695 if (ret < 0) { 696 break; 697 } 698 revinfo.revision = be16_to_cpu(revinfo.revision); 699 revinfo.length = be16_to_cpu(revinfo.length); 700 if (ccw.count < len + revinfo.length || 701 (check_len && ccw.count > len + revinfo.length)) { 702 ret = -EINVAL; 703 break; 704 } 705 /* 706 * Once we start to support revisions with additional data, we'll 707 * need to fetch it here. Nothing to do for now, though. 708 */ 709 if (dev->revision >= 0 || 710 revinfo.revision > virtio_ccw_rev_max(dev) || 711 (dev->force_revision_1 && !revinfo.revision)) { 712 ret = -ENOSYS; 713 break; 714 } 715 ret = 0; 716 dev->revision = revinfo.revision; 717 break; 718 default: 719 ret = -ENOSYS; 720 break; 721 } 722 return ret; 723} 724 725static void virtio_sch_disable_cb(SubchDev *sch) 726{ 727 VirtioCcwDevice *dev = sch->driver_data; 728 729 dev->revision = -1; 730} 731 732static void virtio_ccw_device_realize(VirtioCcwDevice *dev, Error **errp) 733{ 734 VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 735 CcwDevice *ccw_dev = CCW_DEVICE(dev); 736 CCWDeviceClass *ck = CCW_DEVICE_GET_CLASS(ccw_dev); 737 SubchDev *sch; 738 Error *err = NULL; 739 int i; 740 741 sch = css_create_sch(ccw_dev->devno, errp); 742 if (!sch) { 743 return; 744 } 745 if (!virtio_ccw_rev_max(dev) && dev->force_revision_1) { 746 error_setg(&err, "Invalid value of property max_rev " 747 "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); 748 goto out_err; 749 } 750 751 sch->driver_data = dev; 752 sch->ccw_cb = virtio_ccw_cb; 753 sch->disable_cb = virtio_sch_disable_cb; 754 sch->id.reserved = 0xff; 755 sch->id.cu_type = VIRTIO_CCW_CU_TYPE; 756 sch->do_subchannel_work = do_subchannel_work_virtual; 757 sch->irb_cb = build_irb_virtual; 758 ccw_dev->sch = sch; 759 dev->indicators = NULL; 760 dev->revision = -1; 761 for (i = 0; i < ADAPTER_ROUTES_MAX_GSI; i++) { 762 dev->routes.gsi[i] = -1; 763 } 764 css_sch_build_virtual_schib(sch, 0, VIRTIO_CCW_CHPID_TYPE); 765 766 trace_virtio_ccw_new_device( 767 sch->cssid, sch->ssid, sch->schid, sch->devno, 768 ccw_dev->devno.valid ? "user-configured" : "auto-configured"); 769 770 if (kvm_enabled() && !kvm_eventfds_enabled()) { 771 dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; 772 } 773 774 /* fd-based ioevents can't be synchronized in record/replay */ 775 if (replay_mode != REPLAY_MODE_NONE) { 776 dev->flags &= ~VIRTIO_CCW_FLAG_USE_IOEVENTFD; 777 } 778 779 if (k->realize) { 780 k->realize(dev, &err); 781 if (err) { 782 goto out_err; 783 } 784 } 785 786 ck->realize(ccw_dev, &err); 787 if (err) { 788 goto out_err; 789 } 790 791 return; 792 793out_err: 794 error_propagate(errp, err); 795 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 796 ccw_dev->sch = NULL; 797 g_free(sch); 798} 799 800static void virtio_ccw_device_unrealize(VirtioCcwDevice *dev) 801{ 802 VirtIOCCWDeviceClass *dc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 803 CcwDevice *ccw_dev = CCW_DEVICE(dev); 804 SubchDev *sch = ccw_dev->sch; 805 806 if (dc->unrealize) { 807 dc->unrealize(dev); 808 } 809 810 if (sch) { 811 css_subch_assign(sch->cssid, sch->ssid, sch->schid, sch->devno, NULL); 812 g_free(sch); 813 ccw_dev->sch = NULL; 814 } 815 if (dev->indicators) { 816 release_indicator(&dev->routes.adapter, dev->indicators); 817 dev->indicators = NULL; 818 } 819} 820 821/* DeviceState to VirtioCcwDevice. Note: used on datapath, 822 * be careful and test performance if you change this. 823 */ 824static inline VirtioCcwDevice *to_virtio_ccw_dev_fast(DeviceState *d) 825{ 826 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 827 828 return container_of(ccw_dev, VirtioCcwDevice, parent_obj); 829} 830 831static uint8_t virtio_set_ind_atomic(SubchDev *sch, uint64_t ind_loc, 832 uint8_t to_be_set) 833{ 834 uint8_t expected, actual; 835 hwaddr len = 1; 836 /* avoid multiple fetches */ 837 uint8_t volatile *ind_addr; 838 839 ind_addr = cpu_physical_memory_map(ind_loc, &len, true); 840 if (!ind_addr) { 841 error_report("%s(%x.%x.%04x): unable to access indicator", 842 __func__, sch->cssid, sch->ssid, sch->schid); 843 return -1; 844 } 845 actual = *ind_addr; 846 do { 847 expected = actual; 848 actual = qatomic_cmpxchg(ind_addr, expected, expected | to_be_set); 849 } while (actual != expected); 850 trace_virtio_ccw_set_ind(ind_loc, actual, actual | to_be_set); 851 cpu_physical_memory_unmap((void *)ind_addr, len, 1, len); 852 853 return actual; 854} 855 856static void virtio_ccw_notify(DeviceState *d, uint16_t vector) 857{ 858 VirtioCcwDevice *dev = to_virtio_ccw_dev_fast(d); 859 CcwDevice *ccw_dev = to_ccw_dev_fast(d); 860 SubchDev *sch = ccw_dev->sch; 861 uint64_t indicators; 862 863 if (vector == VIRTIO_NO_VECTOR) { 864 return; 865 } 866 /* 867 * vector < VIRTIO_QUEUE_MAX: notification for a virtqueue 868 * vector == VIRTIO_QUEUE_MAX: configuration change notification 869 * bits beyond that are unused and should never be notified for 870 */ 871 assert(vector <= VIRTIO_QUEUE_MAX); 872 873 if (vector < VIRTIO_QUEUE_MAX) { 874 if (!dev->indicators) { 875 return; 876 } 877 if (sch->thinint_active) { 878 /* 879 * In the adapter interrupt case, indicators points to a 880 * memory area that may be (way) larger than 64 bit and 881 * ind_bit indicates the start of the indicators in a big 882 * endian notation. 883 */ 884 uint64_t ind_bit = dev->routes.adapter.ind_offset; 885 886 virtio_set_ind_atomic(sch, dev->indicators->addr + 887 (ind_bit + vector) / 8, 888 0x80 >> ((ind_bit + vector) % 8)); 889 if (!virtio_set_ind_atomic(sch, dev->summary_indicator->addr, 890 0x01)) { 891 css_adapter_interrupt(CSS_IO_ADAPTER_VIRTIO, dev->thinint_isc); 892 } 893 } else { 894 assert(vector < NR_CLASSIC_INDICATOR_BITS); 895 indicators = address_space_ldq(&address_space_memory, 896 dev->indicators->addr, 897 MEMTXATTRS_UNSPECIFIED, 898 NULL); 899 indicators |= 1ULL << vector; 900 address_space_stq(&address_space_memory, dev->indicators->addr, 901 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 902 css_conditional_io_interrupt(sch); 903 } 904 } else { 905 if (!dev->indicators2) { 906 return; 907 } 908 indicators = address_space_ldq(&address_space_memory, 909 dev->indicators2->addr, 910 MEMTXATTRS_UNSPECIFIED, 911 NULL); 912 indicators |= 1ULL; 913 address_space_stq(&address_space_memory, dev->indicators2->addr, 914 indicators, MEMTXATTRS_UNSPECIFIED, NULL); 915 css_conditional_io_interrupt(sch); 916 } 917} 918 919static void virtio_ccw_reset(DeviceState *d) 920{ 921 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 922 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 923 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_GET_CLASS(dev); 924 925 virtio_ccw_reset_virtio(dev, vdev); 926 if (vdc->parent_reset) { 927 vdc->parent_reset(d); 928 } 929} 930 931static void virtio_ccw_vmstate_change(DeviceState *d, bool running) 932{ 933 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 934 935 if (running) { 936 virtio_ccw_start_ioeventfd(dev); 937 } else { 938 virtio_ccw_stop_ioeventfd(dev); 939 } 940} 941 942static bool virtio_ccw_query_guest_notifiers(DeviceState *d) 943{ 944 CcwDevice *dev = CCW_DEVICE(d); 945 946 return !!(dev->sch->curr_status.pmcw.flags & PMCW_FLAGS_MASK_ENA); 947} 948 949static int virtio_ccw_get_mappings(VirtioCcwDevice *dev) 950{ 951 int r; 952 CcwDevice *ccw_dev = CCW_DEVICE(dev); 953 954 if (!ccw_dev->sch->thinint_active) { 955 return -EINVAL; 956 } 957 958 r = map_indicator(&dev->routes.adapter, dev->summary_indicator); 959 if (r) { 960 return r; 961 } 962 r = map_indicator(&dev->routes.adapter, dev->indicators); 963 if (r) { 964 return r; 965 } 966 dev->routes.adapter.summary_addr = dev->summary_indicator->map; 967 dev->routes.adapter.ind_addr = dev->indicators->map; 968 969 return 0; 970} 971 972static int virtio_ccw_setup_irqroutes(VirtioCcwDevice *dev, int nvqs) 973{ 974 int i; 975 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 976 int ret; 977 S390FLICState *fs = s390_get_flic(); 978 S390FLICStateClass *fsc = s390_get_flic_class(fs); 979 980 ret = virtio_ccw_get_mappings(dev); 981 if (ret) { 982 return ret; 983 } 984 for (i = 0; i < nvqs; i++) { 985 if (!virtio_queue_get_num(vdev, i)) { 986 break; 987 } 988 } 989 dev->routes.num_routes = i; 990 return fsc->add_adapter_routes(fs, &dev->routes); 991} 992 993static void virtio_ccw_release_irqroutes(VirtioCcwDevice *dev, int nvqs) 994{ 995 S390FLICState *fs = s390_get_flic(); 996 S390FLICStateClass *fsc = s390_get_flic_class(fs); 997 998 fsc->release_adapter_routes(fs, &dev->routes); 999} 1000 1001static int virtio_ccw_add_irqfd(VirtioCcwDevice *dev, int n) 1002{ 1003 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1004 VirtQueue *vq = virtio_get_queue(vdev, n); 1005 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 1006 1007 return kvm_irqchip_add_irqfd_notifier_gsi(kvm_state, notifier, NULL, 1008 dev->routes.gsi[n]); 1009} 1010 1011static void virtio_ccw_remove_irqfd(VirtioCcwDevice *dev, int n) 1012{ 1013 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1014 VirtQueue *vq = virtio_get_queue(vdev, n); 1015 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 1016 int ret; 1017 1018 ret = kvm_irqchip_remove_irqfd_notifier_gsi(kvm_state, notifier, 1019 dev->routes.gsi[n]); 1020 assert(ret == 0); 1021} 1022 1023static int virtio_ccw_set_guest_notifier(VirtioCcwDevice *dev, int n, 1024 bool assign, bool with_irqfd) 1025{ 1026 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1027 VirtQueue *vq = virtio_get_queue(vdev, n); 1028 EventNotifier *notifier = virtio_queue_get_guest_notifier(vq); 1029 VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev); 1030 1031 if (assign) { 1032 int r = event_notifier_init(notifier, 0); 1033 1034 if (r < 0) { 1035 return r; 1036 } 1037 virtio_queue_set_guest_notifier_fd_handler(vq, true, with_irqfd); 1038 if (with_irqfd) { 1039 r = virtio_ccw_add_irqfd(dev, n); 1040 if (r) { 1041 virtio_queue_set_guest_notifier_fd_handler(vq, false, 1042 with_irqfd); 1043 return r; 1044 } 1045 } 1046 /* 1047 * We do not support individual masking for channel devices, so we 1048 * need to manually trigger any guest masking callbacks here. 1049 */ 1050 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1051 k->guest_notifier_mask(vdev, n, false); 1052 } 1053 /* get lost events and re-inject */ 1054 if (k->guest_notifier_pending && 1055 k->guest_notifier_pending(vdev, n)) { 1056 event_notifier_set(notifier); 1057 } 1058 } else { 1059 if (k->guest_notifier_mask && vdev->use_guest_notifier_mask) { 1060 k->guest_notifier_mask(vdev, n, true); 1061 } 1062 if (with_irqfd) { 1063 virtio_ccw_remove_irqfd(dev, n); 1064 } 1065 virtio_queue_set_guest_notifier_fd_handler(vq, false, with_irqfd); 1066 event_notifier_cleanup(notifier); 1067 } 1068 return 0; 1069} 1070 1071static int virtio_ccw_set_guest_notifiers(DeviceState *d, int nvqs, 1072 bool assigned) 1073{ 1074 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1075 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1076 CcwDevice *ccw_dev = CCW_DEVICE(d); 1077 bool with_irqfd = ccw_dev->sch->thinint_active && kvm_irqfds_enabled(); 1078 int r, n; 1079 1080 if (with_irqfd && assigned) { 1081 /* irq routes need to be set up before assigning irqfds */ 1082 r = virtio_ccw_setup_irqroutes(dev, nvqs); 1083 if (r < 0) { 1084 goto irqroute_error; 1085 } 1086 } 1087 for (n = 0; n < nvqs; n++) { 1088 if (!virtio_queue_get_num(vdev, n)) { 1089 break; 1090 } 1091 r = virtio_ccw_set_guest_notifier(dev, n, assigned, with_irqfd); 1092 if (r < 0) { 1093 goto assign_error; 1094 } 1095 } 1096 if (with_irqfd && !assigned) { 1097 /* release irq routes after irqfds have been released */ 1098 virtio_ccw_release_irqroutes(dev, nvqs); 1099 } 1100 return 0; 1101 1102assign_error: 1103 while (--n >= 0) { 1104 virtio_ccw_set_guest_notifier(dev, n, !assigned, false); 1105 } 1106irqroute_error: 1107 if (with_irqfd && assigned) { 1108 virtio_ccw_release_irqroutes(dev, nvqs); 1109 } 1110 return r; 1111} 1112 1113static void virtio_ccw_save_queue(DeviceState *d, int n, QEMUFile *f) 1114{ 1115 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1116 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1117 1118 qemu_put_be16(f, virtio_queue_vector(vdev, n)); 1119} 1120 1121static int virtio_ccw_load_queue(DeviceState *d, int n, QEMUFile *f) 1122{ 1123 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1124 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1125 uint16_t vector; 1126 1127 qemu_get_be16s(f, &vector); 1128 virtio_queue_set_vector(vdev, n , vector); 1129 1130 return 0; 1131} 1132 1133static void virtio_ccw_save_config(DeviceState *d, QEMUFile *f) 1134{ 1135 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1136 vmstate_save_state(f, &vmstate_virtio_ccw_dev, dev, NULL); 1137} 1138 1139static int virtio_ccw_load_config(DeviceState *d, QEMUFile *f) 1140{ 1141 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1142 return vmstate_load_state(f, &vmstate_virtio_ccw_dev, dev, 1); 1143} 1144 1145static void virtio_ccw_pre_plugged(DeviceState *d, Error **errp) 1146{ 1147 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1148 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1149 1150 if (dev->max_rev >= 1) { 1151 virtio_add_feature(&vdev->host_features, VIRTIO_F_VERSION_1); 1152 } 1153} 1154 1155/* This is called by virtio-bus just after the device is plugged. */ 1156static void virtio_ccw_device_plugged(DeviceState *d, Error **errp) 1157{ 1158 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1159 VirtIODevice *vdev = virtio_bus_get_device(&dev->bus); 1160 CcwDevice *ccw_dev = CCW_DEVICE(d); 1161 SubchDev *sch = ccw_dev->sch; 1162 int n = virtio_get_num_queues(vdev); 1163 S390FLICState *flic = s390_get_flic(); 1164 1165 if (!virtio_has_feature(vdev->host_features, VIRTIO_F_VERSION_1)) { 1166 dev->max_rev = 0; 1167 } 1168 1169 if (!virtio_ccw_rev_max(dev) && !virtio_legacy_allowed(vdev)) { 1170 /* 1171 * To avoid migration issues, we allow legacy mode when legacy 1172 * check is disabled in the old machine types (< 5.1). 1173 */ 1174 if (virtio_legacy_check_disabled(vdev)) { 1175 warn_report("device requires revision >= 1, but for backward " 1176 "compatibility max_revision=0 is allowed"); 1177 } else { 1178 error_setg(errp, "Invalid value of property max_rev " 1179 "(is %d expected >= 1)", virtio_ccw_rev_max(dev)); 1180 return; 1181 } 1182 } 1183 1184 if (virtio_get_num_queues(vdev) > VIRTIO_QUEUE_MAX) { 1185 error_setg(errp, "The number of virtqueues %d " 1186 "exceeds virtio limit %d", n, 1187 VIRTIO_QUEUE_MAX); 1188 return; 1189 } 1190 if (virtio_get_num_queues(vdev) > flic->adapter_routes_max_batch) { 1191 error_setg(errp, "The number of virtqueues %d " 1192 "exceeds flic adapter route limit %d", n, 1193 flic->adapter_routes_max_batch); 1194 return; 1195 } 1196 1197 sch->id.cu_model = virtio_bus_get_vdev_id(&dev->bus); 1198 1199 1200 css_generate_sch_crws(sch->cssid, sch->ssid, sch->schid, 1201 d->hotplugged, 1); 1202} 1203 1204static void virtio_ccw_device_unplugged(DeviceState *d) 1205{ 1206 VirtioCcwDevice *dev = VIRTIO_CCW_DEVICE(d); 1207 1208 virtio_ccw_stop_ioeventfd(dev); 1209} 1210/**************** Virtio-ccw Bus Device Descriptions *******************/ 1211 1212static void virtio_ccw_busdev_realize(DeviceState *dev, Error **errp) 1213{ 1214 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1215 1216 virtio_ccw_bus_new(&_dev->bus, sizeof(_dev->bus), _dev); 1217 virtio_ccw_device_realize(_dev, errp); 1218} 1219 1220static void virtio_ccw_busdev_unrealize(DeviceState *dev) 1221{ 1222 VirtioCcwDevice *_dev = (VirtioCcwDevice *)dev; 1223 1224 virtio_ccw_device_unrealize(_dev); 1225} 1226 1227static void virtio_ccw_busdev_unplug(HotplugHandler *hotplug_dev, 1228 DeviceState *dev, Error **errp) 1229{ 1230 VirtioCcwDevice *_dev = to_virtio_ccw_dev_fast(dev); 1231 1232 virtio_ccw_stop_ioeventfd(_dev); 1233} 1234 1235static void virtio_ccw_device_class_init(ObjectClass *klass, void *data) 1236{ 1237 DeviceClass *dc = DEVICE_CLASS(klass); 1238 CCWDeviceClass *k = CCW_DEVICE_CLASS(dc); 1239 VirtIOCCWDeviceClass *vdc = VIRTIO_CCW_DEVICE_CLASS(klass); 1240 1241 k->unplug = virtio_ccw_busdev_unplug; 1242 dc->realize = virtio_ccw_busdev_realize; 1243 dc->unrealize = virtio_ccw_busdev_unrealize; 1244 device_class_set_parent_reset(dc, virtio_ccw_reset, &vdc->parent_reset); 1245} 1246 1247static const TypeInfo virtio_ccw_device_info = { 1248 .name = TYPE_VIRTIO_CCW_DEVICE, 1249 .parent = TYPE_CCW_DEVICE, 1250 .instance_size = sizeof(VirtioCcwDevice), 1251 .class_init = virtio_ccw_device_class_init, 1252 .class_size = sizeof(VirtIOCCWDeviceClass), 1253 .abstract = true, 1254}; 1255 1256/* virtio-ccw-bus */ 1257 1258static void virtio_ccw_bus_new(VirtioBusState *bus, size_t bus_size, 1259 VirtioCcwDevice *dev) 1260{ 1261 DeviceState *qdev = DEVICE(dev); 1262 char virtio_bus_name[] = "virtio-bus"; 1263 1264 qbus_init(bus, bus_size, TYPE_VIRTIO_CCW_BUS, qdev, virtio_bus_name); 1265} 1266 1267static void virtio_ccw_bus_class_init(ObjectClass *klass, void *data) 1268{ 1269 VirtioBusClass *k = VIRTIO_BUS_CLASS(klass); 1270 BusClass *bus_class = BUS_CLASS(klass); 1271 1272 bus_class->max_dev = 1; 1273 k->notify = virtio_ccw_notify; 1274 k->vmstate_change = virtio_ccw_vmstate_change; 1275 k->query_guest_notifiers = virtio_ccw_query_guest_notifiers; 1276 k->set_guest_notifiers = virtio_ccw_set_guest_notifiers; 1277 k->save_queue = virtio_ccw_save_queue; 1278 k->load_queue = virtio_ccw_load_queue; 1279 k->save_config = virtio_ccw_save_config; 1280 k->load_config = virtio_ccw_load_config; 1281 k->pre_plugged = virtio_ccw_pre_plugged; 1282 k->device_plugged = virtio_ccw_device_plugged; 1283 k->device_unplugged = virtio_ccw_device_unplugged; 1284 k->ioeventfd_enabled = virtio_ccw_ioeventfd_enabled; 1285 k->ioeventfd_assign = virtio_ccw_ioeventfd_assign; 1286} 1287 1288static const TypeInfo virtio_ccw_bus_info = { 1289 .name = TYPE_VIRTIO_CCW_BUS, 1290 .parent = TYPE_VIRTIO_BUS, 1291 .instance_size = sizeof(VirtioCcwBusState), 1292 .class_size = sizeof(VirtioCcwBusClass), 1293 .class_init = virtio_ccw_bus_class_init, 1294}; 1295 1296static void virtio_ccw_register(void) 1297{ 1298 type_register_static(&virtio_ccw_bus_info); 1299 type_register_static(&virtio_ccw_device_info); 1300} 1301 1302type_init(virtio_ccw_register)