1 /* 2 * Virtio Block Device 3 * 4 * Copyright IBM, Corp. 2007 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 */ 13 14 #include "qemu/osdep.h" 15 #include "qemu/defer-call.h" 16 #include "qapi/error.h" 17 #include "qemu/iov.h" 18 #include "qemu/module.h" 19 #include "qemu/error-report.h" 20 #include "qemu/main-loop.h" 21 #include "block/block_int.h" 22 #include "trace.h" 23 #include "hw/block/block.h" 24 #include "hw/qdev-properties.h" 25 #include "system/blockdev.h" 26 #include "system/block-ram-registrar.h" 27 #include "system/system.h" 28 #include "system/runstate.h" 29 #include "hw/virtio/virtio-blk.h" 30 #include "scsi/constants.h" 31 #ifdef __linux__ 32 # include <scsi/sg.h> 33 #endif 34 #include "hw/virtio/virtio-bus.h" 35 #include "migration/qemu-file-types.h" 36 #include "hw/virtio/iothread-vq-mapping.h" 37 #include "hw/virtio/virtio-access.h" 38 #include "hw/virtio/virtio-blk-common.h" 39 #include "qemu/coroutine.h" 40 41 static void virtio_blk_ioeventfd_attach(VirtIOBlock *s); 42 43 static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq, 44 VirtIOBlockReq *req) 45 { 46 req->dev = s; 47 req->vq = vq; 48 req->qiov.size = 0; 49 req->in_len = 0; 50 req->next = NULL; 51 req->mr_next = NULL; 52 } 53 54 void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status) 55 { 56 VirtIOBlock *s = req->dev; 57 VirtIODevice *vdev = VIRTIO_DEVICE(s); 58 59 trace_virtio_blk_req_complete(vdev, req, status); 60 61 stb_p(&req->in->status, status); 62 iov_discard_undo(&req->inhdr_undo); 63 iov_discard_undo(&req->outhdr_undo); 64 virtqueue_push(req->vq, &req->elem, req->in_len); 65 if (qemu_in_iothread()) { 66 virtio_notify_irqfd(vdev, req->vq); 67 } else { 68 virtio_notify(vdev, req->vq); 69 } 70 } 71 72 static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, 73 bool is_read, bool acct_failed) 74 { 75 VirtIOBlock *s = req->dev; 76 BlockErrorAction action = blk_get_error_action(s->blk, is_read, error); 77 78 if (action == BLOCK_ERROR_ACTION_STOP) { 79 /* Break the link as the next request is going to be parsed from the 80 * ring again. Otherwise we may end up doing a double completion! */ 81 req->mr_next = NULL; 82 83 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 84 req->next = s->rq; 85 s->rq = req; 86 } 87 } else if (action == BLOCK_ERROR_ACTION_REPORT) { 88 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); 89 if (acct_failed) { 90 block_acct_failed(blk_get_stats(s->blk), &req->acct); 91 } 92 g_free(req); 93 } 94 95 blk_error_action(s->blk, action, is_read, error); 96 return action != BLOCK_ERROR_ACTION_IGNORE; 97 } 98 99 static void virtio_blk_rw_complete(void *opaque, int ret) 100 { 101 VirtIOBlockReq *next = opaque; 102 VirtIOBlock *s = next->dev; 103 VirtIODevice *vdev = VIRTIO_DEVICE(s); 104 105 while (next) { 106 VirtIOBlockReq *req = next; 107 next = req->mr_next; 108 trace_virtio_blk_rw_complete(vdev, req, ret); 109 110 if (req->qiov.nalloc != -1) { 111 /* If nalloc is != -1 req->qiov is a local copy of the original 112 * external iovec. It was allocated in submit_requests to be 113 * able to merge requests. */ 114 qemu_iovec_destroy(&req->qiov); 115 } 116 117 if (ret) { 118 int p = virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type); 119 bool is_read = !(p & VIRTIO_BLK_T_OUT); 120 /* Note that memory may be dirtied on read failure. If the 121 * virtio request is not completed here, as is the case for 122 * BLOCK_ERROR_ACTION_STOP, the memory may not be copied 123 * correctly during live migration. While this is ugly, 124 * it is acceptable because the device is free to write to 125 * the memory until the request is completed (which will 126 * happen on the other side of the migration). 127 */ 128 if (virtio_blk_handle_rw_error(req, -ret, is_read, true)) { 129 continue; 130 } 131 } 132 133 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 134 block_acct_done(blk_get_stats(s->blk), &req->acct); 135 g_free(req); 136 } 137 } 138 139 static void virtio_blk_flush_complete(void *opaque, int ret) 140 { 141 VirtIOBlockReq *req = opaque; 142 VirtIOBlock *s = req->dev; 143 144 if (ret && virtio_blk_handle_rw_error(req, -ret, 0, true)) { 145 return; 146 } 147 148 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 149 block_acct_done(blk_get_stats(s->blk), &req->acct); 150 g_free(req); 151 } 152 153 static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret) 154 { 155 VirtIOBlockReq *req = opaque; 156 VirtIOBlock *s = req->dev; 157 bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) & 158 ~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES; 159 160 if (ret && virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) { 161 return; 162 } 163 164 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 165 if (is_write_zeroes) { 166 block_acct_done(blk_get_stats(s->blk), &req->acct); 167 } 168 g_free(req); 169 } 170 171 static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq) 172 { 173 VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq)); 174 175 if (req) { 176 virtio_blk_init_request(s, vq, req); 177 } 178 return req; 179 } 180 181 static void virtio_blk_handle_scsi(VirtIOBlockReq *req) 182 { 183 int status; 184 struct virtio_scsi_inhdr *scsi; 185 VirtIOBlock *blk = req->dev; 186 VirtIODevice *vdev = VIRTIO_DEVICE(blk); 187 VirtQueueElement *elem = &req->elem; 188 189 /* 190 * We require at least one output segment each for the virtio_blk_outhdr 191 * and the SCSI command block. 192 * 193 * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr 194 * and the sense buffer pointer in the input segments. 195 */ 196 if (elem->out_num < 2 || elem->in_num < 3) { 197 status = VIRTIO_BLK_S_IOERR; 198 goto fail; 199 } 200 201 /* 202 * The scsi inhdr is placed in the second-to-last input segment, just 203 * before the regular inhdr. 204 * 205 * Just put anything nonzero so that the ioctl fails in the guest. 206 */ 207 scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base; 208 virtio_stl_p(vdev, &scsi->errors, 255); 209 status = VIRTIO_BLK_S_UNSUPP; 210 211 fail: 212 virtio_blk_req_complete(req, status); 213 g_free(req); 214 } 215 216 static inline void submit_requests(VirtIOBlock *s, MultiReqBuffer *mrb, 217 int start, int num_reqs, int niov) 218 { 219 BlockBackend *blk = s->blk; 220 QEMUIOVector *qiov = &mrb->reqs[start]->qiov; 221 int64_t sector_num = mrb->reqs[start]->sector_num; 222 bool is_write = mrb->is_write; 223 BdrvRequestFlags flags = 0; 224 225 if (num_reqs > 1) { 226 int i; 227 struct iovec *tmp_iov = qiov->iov; 228 int tmp_niov = qiov->niov; 229 230 /* mrb->reqs[start]->qiov was initialized from external so we can't 231 * modify it here. We need to initialize it locally and then add the 232 * external iovecs. */ 233 qemu_iovec_init(qiov, niov); 234 235 for (i = 0; i < tmp_niov; i++) { 236 qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len); 237 } 238 239 for (i = start + 1; i < start + num_reqs; i++) { 240 qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0, 241 mrb->reqs[i]->qiov.size); 242 mrb->reqs[i - 1]->mr_next = mrb->reqs[i]; 243 } 244 245 trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev), 246 mrb, start, num_reqs, 247 sector_num << BDRV_SECTOR_BITS, 248 qiov->size, is_write); 249 block_acct_merge_done(blk_get_stats(blk), 250 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ, 251 num_reqs - 1); 252 } 253 254 if (blk_ram_registrar_ok(&s->blk_ram_registrar)) { 255 flags |= BDRV_REQ_REGISTERED_BUF; 256 } 257 258 if (is_write) { 259 blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, 260 flags, virtio_blk_rw_complete, 261 mrb->reqs[start]); 262 } else { 263 blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, 264 flags, virtio_blk_rw_complete, 265 mrb->reqs[start]); 266 } 267 } 268 269 static int multireq_compare(const void *a, const void *b) 270 { 271 const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a, 272 *req2 = *(VirtIOBlockReq **)b; 273 274 /* 275 * Note that we can't simply subtract sector_num1 from sector_num2 276 * here as that could overflow the return value. 277 */ 278 if (req1->sector_num > req2->sector_num) { 279 return 1; 280 } else if (req1->sector_num < req2->sector_num) { 281 return -1; 282 } else { 283 return 0; 284 } 285 } 286 287 static void virtio_blk_submit_multireq(VirtIOBlock *s, MultiReqBuffer *mrb) 288 { 289 int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0; 290 uint32_t max_transfer; 291 int64_t sector_num = 0; 292 293 if (mrb->num_reqs == 1) { 294 submit_requests(s, mrb, 0, 1, -1); 295 mrb->num_reqs = 0; 296 return; 297 } 298 299 max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk); 300 301 qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs), 302 &multireq_compare); 303 304 for (i = 0; i < mrb->num_reqs; i++) { 305 VirtIOBlockReq *req = mrb->reqs[i]; 306 if (num_reqs > 0) { 307 /* 308 * NOTE: We cannot merge the requests in below situations: 309 * 1. requests are not sequential 310 * 2. merge would exceed maximum number of IOVs 311 * 3. merge would exceed maximum transfer length of backend device 312 */ 313 if (sector_num + nb_sectors != req->sector_num || 314 niov > blk_get_max_iov(s->blk) - req->qiov.niov || 315 req->qiov.size > max_transfer || 316 nb_sectors > (max_transfer - 317 req->qiov.size) / BDRV_SECTOR_SIZE) { 318 submit_requests(s, mrb, start, num_reqs, niov); 319 num_reqs = 0; 320 } 321 } 322 323 if (num_reqs == 0) { 324 sector_num = req->sector_num; 325 nb_sectors = niov = 0; 326 start = i; 327 } 328 329 nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE; 330 niov += req->qiov.niov; 331 num_reqs++; 332 } 333 334 submit_requests(s, mrb, start, num_reqs, niov); 335 mrb->num_reqs = 0; 336 } 337 338 static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) 339 { 340 VirtIOBlock *s = req->dev; 341 342 block_acct_start(blk_get_stats(s->blk), &req->acct, 0, 343 BLOCK_ACCT_FLUSH); 344 345 /* 346 * Make sure all outstanding writes are posted to the backing device. 347 */ 348 if (mrb->is_write && mrb->num_reqs > 0) { 349 virtio_blk_submit_multireq(s, mrb); 350 } 351 blk_aio_flush(s->blk, virtio_blk_flush_complete, req); 352 } 353 354 static bool virtio_blk_sect_range_ok(VirtIOBlock *dev, 355 uint64_t sector, size_t size) 356 { 357 uint64_t nb_sectors = size >> BDRV_SECTOR_BITS; 358 uint64_t total_sectors; 359 360 if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) { 361 return false; 362 } 363 if (sector & dev->sector_mask) { 364 return false; 365 } 366 if (size % dev->conf.conf.logical_block_size) { 367 return false; 368 } 369 blk_get_geometry(dev->blk, &total_sectors); 370 if (sector > total_sectors || nb_sectors > total_sectors - sector) { 371 return false; 372 } 373 return true; 374 } 375 376 static uint8_t virtio_blk_handle_discard_write_zeroes(VirtIOBlockReq *req, 377 struct virtio_blk_discard_write_zeroes *dwz_hdr, bool is_write_zeroes) 378 { 379 VirtIOBlock *s = req->dev; 380 VirtIODevice *vdev = VIRTIO_DEVICE(s); 381 uint64_t sector; 382 uint32_t num_sectors, flags, max_sectors; 383 uint8_t err_status; 384 int bytes; 385 386 sector = virtio_ldq_p(vdev, &dwz_hdr->sector); 387 num_sectors = virtio_ldl_p(vdev, &dwz_hdr->num_sectors); 388 flags = virtio_ldl_p(vdev, &dwz_hdr->flags); 389 max_sectors = is_write_zeroes ? s->conf.max_write_zeroes_sectors : 390 s->conf.max_discard_sectors; 391 392 /* 393 * max_sectors is at most BDRV_REQUEST_MAX_SECTORS, this check 394 * make us sure that "num_sectors << BDRV_SECTOR_BITS" can fit in 395 * the integer variable. 396 */ 397 if (unlikely(num_sectors > max_sectors)) { 398 err_status = VIRTIO_BLK_S_IOERR; 399 goto err; 400 } 401 402 bytes = num_sectors << BDRV_SECTOR_BITS; 403 404 if (unlikely(!virtio_blk_sect_range_ok(s, sector, bytes))) { 405 err_status = VIRTIO_BLK_S_IOERR; 406 goto err; 407 } 408 409 /* 410 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for discard 411 * and write zeroes commands if any unknown flag is set. 412 */ 413 if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { 414 err_status = VIRTIO_BLK_S_UNSUPP; 415 goto err; 416 } 417 418 if (is_write_zeroes) { /* VIRTIO_BLK_T_WRITE_ZEROES */ 419 int blk_aio_flags = 0; 420 421 if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) { 422 blk_aio_flags |= BDRV_REQ_MAY_UNMAP; 423 } 424 425 block_acct_start(blk_get_stats(s->blk), &req->acct, bytes, 426 BLOCK_ACCT_WRITE); 427 428 blk_aio_pwrite_zeroes(s->blk, sector << BDRV_SECTOR_BITS, 429 bytes, blk_aio_flags, 430 virtio_blk_discard_write_zeroes_complete, req); 431 } else { /* VIRTIO_BLK_T_DISCARD */ 432 /* 433 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for 434 * discard commands if the unmap flag is set. 435 */ 436 if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { 437 err_status = VIRTIO_BLK_S_UNSUPP; 438 goto err; 439 } 440 441 blk_aio_pdiscard(s->blk, sector << BDRV_SECTOR_BITS, bytes, 442 virtio_blk_discard_write_zeroes_complete, req); 443 } 444 445 return VIRTIO_BLK_S_OK; 446 447 err: 448 if (is_write_zeroes) { 449 block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_WRITE); 450 } 451 return err_status; 452 } 453 454 typedef struct ZoneCmdData { 455 VirtIOBlockReq *req; 456 struct iovec *in_iov; 457 unsigned in_num; 458 union { 459 struct { 460 unsigned int nr_zones; 461 BlockZoneDescriptor *zones; 462 } zone_report_data; 463 struct { 464 int64_t offset; 465 } zone_append_data; 466 }; 467 } ZoneCmdData; 468 469 /* 470 * check zoned_request: error checking before issuing requests. If all checks 471 * passed, return true. 472 * append: true if only zone append requests issued. 473 */ 474 static bool check_zoned_request(VirtIOBlock *s, int64_t offset, int64_t len, 475 bool append, uint8_t *status) { 476 BlockDriverState *bs = blk_bs(s->blk); 477 int index; 478 479 if (!virtio_has_feature(s->host_features, VIRTIO_BLK_F_ZONED)) { 480 *status = VIRTIO_BLK_S_UNSUPP; 481 return false; 482 } 483 484 if (offset < 0 || len < 0 || len > (bs->total_sectors << BDRV_SECTOR_BITS) 485 || offset > (bs->total_sectors << BDRV_SECTOR_BITS) - len) { 486 *status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 487 return false; 488 } 489 490 if (append) { 491 if (bs->bl.write_granularity) { 492 if ((offset % bs->bl.write_granularity) != 0) { 493 *status = VIRTIO_BLK_S_ZONE_UNALIGNED_WP; 494 return false; 495 } 496 } 497 498 index = offset / bs->bl.zone_size; 499 if (BDRV_ZT_IS_CONV(bs->wps->wp[index])) { 500 *status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 501 return false; 502 } 503 504 if (len / 512 > bs->bl.max_append_sectors) { 505 if (bs->bl.max_append_sectors == 0) { 506 *status = VIRTIO_BLK_S_UNSUPP; 507 } else { 508 *status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 509 } 510 return false; 511 } 512 } 513 return true; 514 } 515 516 static void virtio_blk_zone_report_complete(void *opaque, int ret) 517 { 518 ZoneCmdData *data = opaque; 519 VirtIOBlockReq *req = data->req; 520 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 521 struct iovec *in_iov = data->in_iov; 522 unsigned in_num = data->in_num; 523 int64_t zrp_size, n, j = 0; 524 int64_t nz = data->zone_report_data.nr_zones; 525 int8_t err_status = VIRTIO_BLK_S_OK; 526 struct virtio_blk_zone_report zrp_hdr = (struct virtio_blk_zone_report) { 527 .nr_zones = cpu_to_le64(nz), 528 }; 529 530 trace_virtio_blk_zone_report_complete(vdev, req, nz, ret); 531 if (ret) { 532 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 533 goto out; 534 } 535 536 zrp_size = sizeof(struct virtio_blk_zone_report) 537 + sizeof(struct virtio_blk_zone_descriptor) * nz; 538 n = iov_from_buf(in_iov, in_num, 0, &zrp_hdr, sizeof(zrp_hdr)); 539 if (n != sizeof(zrp_hdr)) { 540 virtio_error(vdev, "Driver provided input buffer that is too small!"); 541 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 542 goto out; 543 } 544 545 for (size_t i = sizeof(zrp_hdr); i < zrp_size; 546 i += sizeof(struct virtio_blk_zone_descriptor), ++j) { 547 struct virtio_blk_zone_descriptor desc = 548 (struct virtio_blk_zone_descriptor) { 549 .z_start = cpu_to_le64(data->zone_report_data.zones[j].start 550 >> BDRV_SECTOR_BITS), 551 .z_cap = cpu_to_le64(data->zone_report_data.zones[j].cap 552 >> BDRV_SECTOR_BITS), 553 .z_wp = cpu_to_le64(data->zone_report_data.zones[j].wp 554 >> BDRV_SECTOR_BITS), 555 }; 556 557 switch (data->zone_report_data.zones[j].type) { 558 case BLK_ZT_CONV: 559 desc.z_type = VIRTIO_BLK_ZT_CONV; 560 break; 561 case BLK_ZT_SWR: 562 desc.z_type = VIRTIO_BLK_ZT_SWR; 563 break; 564 case BLK_ZT_SWP: 565 desc.z_type = VIRTIO_BLK_ZT_SWP; 566 break; 567 default: 568 g_assert_not_reached(); 569 } 570 571 switch (data->zone_report_data.zones[j].state) { 572 case BLK_ZS_RDONLY: 573 desc.z_state = VIRTIO_BLK_ZS_RDONLY; 574 break; 575 case BLK_ZS_OFFLINE: 576 desc.z_state = VIRTIO_BLK_ZS_OFFLINE; 577 break; 578 case BLK_ZS_EMPTY: 579 desc.z_state = VIRTIO_BLK_ZS_EMPTY; 580 break; 581 case BLK_ZS_CLOSED: 582 desc.z_state = VIRTIO_BLK_ZS_CLOSED; 583 break; 584 case BLK_ZS_FULL: 585 desc.z_state = VIRTIO_BLK_ZS_FULL; 586 break; 587 case BLK_ZS_EOPEN: 588 desc.z_state = VIRTIO_BLK_ZS_EOPEN; 589 break; 590 case BLK_ZS_IOPEN: 591 desc.z_state = VIRTIO_BLK_ZS_IOPEN; 592 break; 593 case BLK_ZS_NOT_WP: 594 desc.z_state = VIRTIO_BLK_ZS_NOT_WP; 595 break; 596 default: 597 g_assert_not_reached(); 598 } 599 600 /* TODO: it takes O(n^2) time complexity. Optimizations required. */ 601 n = iov_from_buf(in_iov, in_num, i, &desc, sizeof(desc)); 602 if (n != sizeof(desc)) { 603 virtio_error(vdev, "Driver provided input buffer " 604 "for descriptors that is too small!"); 605 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 606 } 607 } 608 609 out: 610 virtio_blk_req_complete(req, err_status); 611 g_free(req); 612 g_free(data->zone_report_data.zones); 613 g_free(data); 614 } 615 616 static void virtio_blk_handle_zone_report(VirtIOBlockReq *req, 617 struct iovec *in_iov, 618 unsigned in_num) 619 { 620 VirtIOBlock *s = req->dev; 621 VirtIODevice *vdev = VIRTIO_DEVICE(s); 622 unsigned int nr_zones; 623 ZoneCmdData *data; 624 int64_t zone_size, offset; 625 uint8_t err_status; 626 627 if (req->in_len < sizeof(struct virtio_blk_inhdr) + 628 sizeof(struct virtio_blk_zone_report) + 629 sizeof(struct virtio_blk_zone_descriptor)) { 630 virtio_error(vdev, "in buffer too small for zone report"); 631 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 632 goto out; 633 } 634 635 /* start byte offset of the zone report */ 636 offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS; 637 if (!check_zoned_request(s, offset, 0, false, &err_status)) { 638 goto out; 639 } 640 nr_zones = (req->in_len - sizeof(struct virtio_blk_inhdr) - 641 sizeof(struct virtio_blk_zone_report)) / 642 sizeof(struct virtio_blk_zone_descriptor); 643 trace_virtio_blk_handle_zone_report(vdev, req, 644 offset >> BDRV_SECTOR_BITS, nr_zones); 645 646 zone_size = sizeof(BlockZoneDescriptor) * nr_zones; 647 data = g_malloc(sizeof(ZoneCmdData)); 648 data->req = req; 649 data->in_iov = in_iov; 650 data->in_num = in_num; 651 data->zone_report_data.nr_zones = nr_zones; 652 data->zone_report_data.zones = g_malloc(zone_size), 653 654 blk_aio_zone_report(s->blk, offset, &data->zone_report_data.nr_zones, 655 data->zone_report_data.zones, 656 virtio_blk_zone_report_complete, data); 657 return; 658 out: 659 virtio_blk_req_complete(req, err_status); 660 g_free(req); 661 } 662 663 static void virtio_blk_zone_mgmt_complete(void *opaque, int ret) 664 { 665 VirtIOBlockReq *req = opaque; 666 VirtIOBlock *s = req->dev; 667 VirtIODevice *vdev = VIRTIO_DEVICE(s); 668 int8_t err_status = VIRTIO_BLK_S_OK; 669 trace_virtio_blk_zone_mgmt_complete(vdev, req,ret); 670 671 if (ret) { 672 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 673 } 674 675 virtio_blk_req_complete(req, err_status); 676 g_free(req); 677 } 678 679 static int virtio_blk_handle_zone_mgmt(VirtIOBlockReq *req, BlockZoneOp op) 680 { 681 VirtIOBlock *s = req->dev; 682 VirtIODevice *vdev = VIRTIO_DEVICE(s); 683 BlockDriverState *bs = blk_bs(s->blk); 684 int64_t offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS; 685 uint64_t len; 686 uint64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS; 687 uint8_t err_status = VIRTIO_BLK_S_OK; 688 689 uint32_t type = virtio_ldl_p(vdev, &req->out.type); 690 if (type == VIRTIO_BLK_T_ZONE_RESET_ALL) { 691 /* Entire drive capacity */ 692 offset = 0; 693 len = capacity; 694 trace_virtio_blk_handle_zone_reset_all(vdev, req, 0, 695 bs->total_sectors); 696 } else { 697 if (bs->bl.zone_size > capacity - offset) { 698 /* The zoned device allows the last smaller zone. */ 699 len = capacity - bs->bl.zone_size * (bs->bl.nr_zones - 1ull); 700 } else { 701 len = bs->bl.zone_size; 702 } 703 trace_virtio_blk_handle_zone_mgmt(vdev, req, op, 704 offset >> BDRV_SECTOR_BITS, 705 len >> BDRV_SECTOR_BITS); 706 } 707 708 if (!check_zoned_request(s, offset, len, false, &err_status)) { 709 goto out; 710 } 711 712 blk_aio_zone_mgmt(s->blk, op, offset, len, 713 virtio_blk_zone_mgmt_complete, req); 714 715 return 0; 716 out: 717 virtio_blk_req_complete(req, err_status); 718 g_free(req); 719 return err_status; 720 } 721 722 static void virtio_blk_zone_append_complete(void *opaque, int ret) 723 { 724 ZoneCmdData *data = opaque; 725 VirtIOBlockReq *req = data->req; 726 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 727 int64_t append_sector, n; 728 uint8_t err_status = VIRTIO_BLK_S_OK; 729 730 if (ret) { 731 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 732 goto out; 733 } 734 735 virtio_stq_p(vdev, &append_sector, 736 data->zone_append_data.offset >> BDRV_SECTOR_BITS); 737 n = iov_from_buf(data->in_iov, data->in_num, 0, &append_sector, 738 sizeof(append_sector)); 739 if (n != sizeof(append_sector)) { 740 virtio_error(vdev, "Driver provided input buffer less than size of " 741 "append_sector"); 742 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 743 goto out; 744 } 745 trace_virtio_blk_zone_append_complete(vdev, req, append_sector, ret); 746 747 out: 748 virtio_blk_req_complete(req, err_status); 749 g_free(req); 750 g_free(data); 751 } 752 753 static int virtio_blk_handle_zone_append(VirtIOBlockReq *req, 754 struct iovec *out_iov, 755 struct iovec *in_iov, 756 uint64_t out_num, 757 unsigned in_num) { 758 VirtIOBlock *s = req->dev; 759 VirtIODevice *vdev = VIRTIO_DEVICE(s); 760 uint8_t err_status = VIRTIO_BLK_S_OK; 761 762 int64_t offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS; 763 int64_t len = iov_size(out_iov, out_num); 764 ZoneCmdData *data; 765 766 trace_virtio_blk_handle_zone_append(vdev, req, offset >> BDRV_SECTOR_BITS); 767 if (!check_zoned_request(s, offset, len, true, &err_status)) { 768 goto out; 769 } 770 771 data = g_malloc(sizeof(ZoneCmdData)); 772 data->req = req; 773 data->in_iov = in_iov; 774 data->in_num = in_num; 775 data->zone_append_data.offset = offset; 776 qemu_iovec_init_external(&req->qiov, out_iov, out_num); 777 778 block_acct_start(blk_get_stats(s->blk), &req->acct, len, 779 BLOCK_ACCT_ZONE_APPEND); 780 781 blk_aio_zone_append(s->blk, &data->zone_append_data.offset, &req->qiov, 0, 782 virtio_blk_zone_append_complete, data); 783 return 0; 784 785 out: 786 virtio_blk_req_complete(req, err_status); 787 g_free(req); 788 return err_status; 789 } 790 791 static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) 792 { 793 uint32_t type; 794 struct iovec *in_iov = req->elem.in_sg; 795 struct iovec *out_iov = req->elem.out_sg; 796 unsigned in_num = req->elem.in_num; 797 unsigned out_num = req->elem.out_num; 798 VirtIOBlock *s = req->dev; 799 VirtIODevice *vdev = VIRTIO_DEVICE(s); 800 801 if (req->elem.out_num < 1 || req->elem.in_num < 1) { 802 virtio_error(vdev, "virtio-blk missing headers"); 803 return -1; 804 } 805 806 if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out, 807 sizeof(req->out)) != sizeof(req->out))) { 808 virtio_error(vdev, "virtio-blk request outhdr too short"); 809 return -1; 810 } 811 812 iov_discard_front_undoable(&out_iov, &out_num, sizeof(req->out), 813 &req->outhdr_undo); 814 815 if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) { 816 virtio_error(vdev, "virtio-blk request inhdr too short"); 817 iov_discard_undo(&req->outhdr_undo); 818 return -1; 819 } 820 821 /* We always touch the last byte, so just see how big in_iov is. */ 822 req->in_len = iov_size(in_iov, in_num); 823 req->in = (void *)in_iov[in_num - 1].iov_base 824 + in_iov[in_num - 1].iov_len 825 - sizeof(struct virtio_blk_inhdr); 826 iov_discard_back_undoable(in_iov, &in_num, sizeof(struct virtio_blk_inhdr), 827 &req->inhdr_undo); 828 829 type = virtio_ldl_p(vdev, &req->out.type); 830 831 /* VIRTIO_BLK_T_OUT defines the command direction. VIRTIO_BLK_T_BARRIER 832 * is an optional flag. Although a guest should not send this flag if 833 * not negotiated we ignored it in the past. So keep ignoring it. */ 834 switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) { 835 case VIRTIO_BLK_T_IN: 836 { 837 bool is_write = type & VIRTIO_BLK_T_OUT; 838 req->sector_num = virtio_ldq_p(vdev, &req->out.sector); 839 840 if (is_write) { 841 qemu_iovec_init_external(&req->qiov, out_iov, out_num); 842 trace_virtio_blk_handle_write(vdev, req, req->sector_num, 843 req->qiov.size / BDRV_SECTOR_SIZE); 844 } else { 845 qemu_iovec_init_external(&req->qiov, in_iov, in_num); 846 trace_virtio_blk_handle_read(vdev, req, req->sector_num, 847 req->qiov.size / BDRV_SECTOR_SIZE); 848 } 849 850 if (!virtio_blk_sect_range_ok(s, req->sector_num, req->qiov.size)) { 851 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); 852 block_acct_invalid(blk_get_stats(s->blk), 853 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); 854 g_free(req); 855 return 0; 856 } 857 858 block_acct_start(blk_get_stats(s->blk), &req->acct, req->qiov.size, 859 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); 860 861 /* merge would exceed maximum number of requests or IO direction 862 * changes */ 863 if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS || 864 is_write != mrb->is_write || 865 !s->conf.request_merging)) { 866 virtio_blk_submit_multireq(s, mrb); 867 } 868 869 assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS); 870 mrb->reqs[mrb->num_reqs++] = req; 871 mrb->is_write = is_write; 872 break; 873 } 874 case VIRTIO_BLK_T_FLUSH: 875 virtio_blk_handle_flush(req, mrb); 876 break; 877 case VIRTIO_BLK_T_ZONE_REPORT: 878 virtio_blk_handle_zone_report(req, in_iov, in_num); 879 break; 880 case VIRTIO_BLK_T_ZONE_OPEN: 881 virtio_blk_handle_zone_mgmt(req, BLK_ZO_OPEN); 882 break; 883 case VIRTIO_BLK_T_ZONE_CLOSE: 884 virtio_blk_handle_zone_mgmt(req, BLK_ZO_CLOSE); 885 break; 886 case VIRTIO_BLK_T_ZONE_FINISH: 887 virtio_blk_handle_zone_mgmt(req, BLK_ZO_FINISH); 888 break; 889 case VIRTIO_BLK_T_ZONE_RESET: 890 virtio_blk_handle_zone_mgmt(req, BLK_ZO_RESET); 891 break; 892 case VIRTIO_BLK_T_ZONE_RESET_ALL: 893 virtio_blk_handle_zone_mgmt(req, BLK_ZO_RESET); 894 break; 895 case VIRTIO_BLK_T_SCSI_CMD: 896 virtio_blk_handle_scsi(req); 897 break; 898 case VIRTIO_BLK_T_GET_ID: 899 { 900 /* 901 * NB: per existing s/n string convention the string is 902 * terminated by '\0' only when shorter than buffer. 903 */ 904 const char *serial = s->conf.serial ? s->conf.serial : ""; 905 size_t size = MIN(strlen(serial) + 1, 906 MIN(iov_size(in_iov, in_num), 907 VIRTIO_BLK_ID_BYTES)); 908 iov_from_buf(in_iov, in_num, 0, serial, size); 909 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 910 g_free(req); 911 break; 912 } 913 case VIRTIO_BLK_T_ZONE_APPEND & ~VIRTIO_BLK_T_OUT: 914 /* 915 * Passing out_iov/out_num and in_iov/in_num is not safe 916 * to access req->elem.out_sg directly because it may be 917 * modified by virtio_blk_handle_request(). 918 */ 919 virtio_blk_handle_zone_append(req, out_iov, in_iov, out_num, in_num); 920 break; 921 /* 922 * VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES are defined with 923 * VIRTIO_BLK_T_OUT flag set. We masked this flag in the switch statement, 924 * so we must mask it for these requests, then we will check if it is set. 925 */ 926 case VIRTIO_BLK_T_DISCARD & ~VIRTIO_BLK_T_OUT: 927 case VIRTIO_BLK_T_WRITE_ZEROES & ~VIRTIO_BLK_T_OUT: 928 { 929 struct virtio_blk_discard_write_zeroes dwz_hdr; 930 size_t out_len = iov_size(out_iov, out_num); 931 bool is_write_zeroes = (type & ~VIRTIO_BLK_T_BARRIER) == 932 VIRTIO_BLK_T_WRITE_ZEROES; 933 uint8_t err_status; 934 935 /* 936 * Unsupported if VIRTIO_BLK_T_OUT is not set or the request contains 937 * more than one segment. 938 */ 939 if (unlikely(!(type & VIRTIO_BLK_T_OUT) || 940 out_len > sizeof(dwz_hdr))) { 941 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); 942 g_free(req); 943 return 0; 944 } 945 946 if (unlikely(iov_to_buf(out_iov, out_num, 0, &dwz_hdr, 947 sizeof(dwz_hdr)) != sizeof(dwz_hdr))) { 948 iov_discard_undo(&req->inhdr_undo); 949 iov_discard_undo(&req->outhdr_undo); 950 virtio_error(vdev, "virtio-blk discard/write_zeroes header" 951 " too short"); 952 return -1; 953 } 954 955 err_status = virtio_blk_handle_discard_write_zeroes(req, &dwz_hdr, 956 is_write_zeroes); 957 if (err_status != VIRTIO_BLK_S_OK) { 958 virtio_blk_req_complete(req, err_status); 959 g_free(req); 960 } 961 962 break; 963 } 964 default: 965 { 966 /* 967 * Give subclasses a chance to handle unknown requests. This way the 968 * class lookup is not in the hot path. 969 */ 970 VirtIOBlkClass *vbk = VIRTIO_BLK_GET_CLASS(s); 971 if (!vbk->handle_unknown_request || 972 !vbk->handle_unknown_request(req, mrb, type)) { 973 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); 974 g_free(req); 975 } 976 } 977 } 978 return 0; 979 } 980 981 void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq) 982 { 983 VirtIOBlockReq *req; 984 MultiReqBuffer mrb = {}; 985 bool suppress_notifications = virtio_queue_get_notification(vq); 986 987 defer_call_begin(); 988 989 do { 990 if (suppress_notifications) { 991 virtio_queue_set_notification(vq, 0); 992 } 993 994 while ((req = virtio_blk_get_request(s, vq))) { 995 if (virtio_blk_handle_request(req, &mrb)) { 996 virtqueue_detach_element(req->vq, &req->elem, 0); 997 g_free(req); 998 break; 999 } 1000 } 1001 1002 if (suppress_notifications) { 1003 virtio_queue_set_notification(vq, 1); 1004 } 1005 } while (!virtio_queue_empty(vq)); 1006 1007 if (mrb.num_reqs) { 1008 virtio_blk_submit_multireq(s, &mrb); 1009 } 1010 1011 defer_call_end(); 1012 } 1013 1014 static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) 1015 { 1016 VirtIOBlock *s = (VirtIOBlock *)vdev; 1017 1018 if (!s->ioeventfd_disabled && !s->ioeventfd_started) { 1019 /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start 1020 * ioeventfd here instead of waiting for .set_status(). 1021 */ 1022 virtio_device_start_ioeventfd(vdev); 1023 if (!s->ioeventfd_disabled) { 1024 return; 1025 } 1026 } 1027 1028 virtio_blk_handle_vq(s, vq); 1029 } 1030 1031 static void virtio_blk_dma_restart_bh(void *opaque) 1032 { 1033 VirtIOBlockReq *req = opaque; 1034 VirtIOBlock *s = req->dev; /* we're called with at least one request */ 1035 1036 MultiReqBuffer mrb = {}; 1037 1038 while (req) { 1039 VirtIOBlockReq *next = req->next; 1040 if (virtio_blk_handle_request(req, &mrb)) { 1041 /* Device is now broken and won't do any processing until it gets 1042 * reset. Already queued requests will be lost: let's purge them. 1043 */ 1044 while (req) { 1045 next = req->next; 1046 virtqueue_detach_element(req->vq, &req->elem, 0); 1047 g_free(req); 1048 req = next; 1049 } 1050 break; 1051 } 1052 req = next; 1053 } 1054 1055 if (mrb.num_reqs) { 1056 virtio_blk_submit_multireq(s, &mrb); 1057 } 1058 1059 /* Paired with inc in virtio_blk_dma_restart_cb() */ 1060 blk_dec_in_flight(s->conf.conf.blk); 1061 } 1062 1063 static void virtio_blk_dma_restart_cb(void *opaque, bool running, 1064 RunState state) 1065 { 1066 VirtIOBlock *s = opaque; 1067 uint16_t num_queues = s->conf.num_queues; 1068 g_autofree VirtIOBlockReq **vq_rq = NULL; 1069 VirtIOBlockReq *rq = NULL; 1070 1071 if (!running) { 1072 return; 1073 } 1074 1075 /* Split the device-wide s->rq request list into per-vq request lists */ 1076 vq_rq = g_new0(VirtIOBlockReq *, num_queues); 1077 1078 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 1079 rq = s->rq; 1080 s->rq = NULL; 1081 } 1082 1083 while (rq) { 1084 VirtIOBlockReq *next = rq->next; 1085 uint16_t idx = virtio_get_queue_index(rq->vq); 1086 1087 /* Only num_queues vqs were created so vq_rq[idx] is within bounds */ 1088 assert(idx < num_queues); 1089 rq->next = vq_rq[idx]; 1090 vq_rq[idx] = rq; 1091 rq = next; 1092 } 1093 1094 /* Schedule a BH to submit the requests in each vq's AioContext */ 1095 for (uint16_t i = 0; i < num_queues; i++) { 1096 if (!vq_rq[i]) { 1097 continue; 1098 } 1099 1100 /* Paired with dec in virtio_blk_dma_restart_bh() */ 1101 blk_inc_in_flight(s->conf.conf.blk); 1102 1103 aio_bh_schedule_oneshot(s->vq_aio_context[i], 1104 virtio_blk_dma_restart_bh, 1105 vq_rq[i]); 1106 } 1107 } 1108 1109 static void virtio_blk_reset(VirtIODevice *vdev) 1110 { 1111 VirtIOBlock *s = VIRTIO_BLK(vdev); 1112 VirtIOBlockReq *req; 1113 1114 /* Dataplane has stopped... */ 1115 assert(!s->ioeventfd_started); 1116 1117 /* ...but requests may still be in flight. */ 1118 blk_drain(s->blk); 1119 1120 /* We drop queued requests after blk_drain() because blk_drain() itself can 1121 * produce them. */ 1122 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 1123 while (s->rq) { 1124 req = s->rq; 1125 s->rq = req->next; 1126 1127 /* No other threads can access req->vq here */ 1128 virtqueue_detach_element(req->vq, &req->elem, 0); 1129 1130 g_free(req); 1131 } 1132 } 1133 1134 blk_set_enable_write_cache(s->blk, s->original_wce); 1135 } 1136 1137 /* coalesce internal state, copy to pci i/o region 0 1138 */ 1139 static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) 1140 { 1141 VirtIOBlock *s = VIRTIO_BLK(vdev); 1142 BlockConf *conf = &s->conf.conf; 1143 BlockDriverState *bs = blk_bs(s->blk); 1144 struct virtio_blk_config blkcfg; 1145 uint64_t capacity; 1146 int64_t length; 1147 int blk_size = conf->logical_block_size; 1148 1149 blk_get_geometry(s->blk, &capacity); 1150 memset(&blkcfg, 0, sizeof(blkcfg)); 1151 virtio_stq_p(vdev, &blkcfg.capacity, capacity); 1152 virtio_stl_p(vdev, &blkcfg.seg_max, 1153 s->conf.seg_max_adjust ? s->conf.queue_size - 2 : 128 - 2); 1154 virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls); 1155 virtio_stl_p(vdev, &blkcfg.blk_size, blk_size); 1156 virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size); 1157 virtio_stl_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size); 1158 blkcfg.geometry.heads = conf->heads; 1159 /* 1160 * We must ensure that the block device capacity is a multiple of 1161 * the logical block size. If that is not the case, let's use 1162 * sector_mask to adopt the geometry to have a correct picture. 1163 * For those devices where the capacity is ok for the given geometry 1164 * we don't touch the sector value of the geometry, since some devices 1165 * (like s390 dasd) need a specific value. Here the capacity is already 1166 * cyls*heads*secs*blk_size and the sector value is not block size 1167 * divided by 512 - instead it is the amount of blk_size blocks 1168 * per track (cylinder). 1169 */ 1170 length = blk_getlength(s->blk); 1171 if (length > 0 && length / conf->heads / conf->secs % blk_size) { 1172 blkcfg.geometry.sectors = conf->secs & ~s->sector_mask; 1173 } else { 1174 blkcfg.geometry.sectors = conf->secs; 1175 } 1176 blkcfg.size_max = 0; 1177 blkcfg.physical_block_exp = get_physical_block_exp(conf); 1178 blkcfg.alignment_offset = 0; 1179 blkcfg.wce = blk_enable_write_cache(s->blk); 1180 virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues); 1181 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD)) { 1182 uint32_t discard_granularity = conf->discard_granularity; 1183 if (discard_granularity == -1 || !s->conf.report_discard_granularity) { 1184 discard_granularity = blk_size; 1185 } 1186 virtio_stl_p(vdev, &blkcfg.max_discard_sectors, 1187 s->conf.max_discard_sectors); 1188 virtio_stl_p(vdev, &blkcfg.discard_sector_alignment, 1189 discard_granularity >> BDRV_SECTOR_BITS); 1190 /* 1191 * We support only one segment per request since multiple segments 1192 * are not widely used and there are no userspace APIs that allow 1193 * applications to submit multiple segments in a single call. 1194 */ 1195 virtio_stl_p(vdev, &blkcfg.max_discard_seg, 1); 1196 } 1197 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES)) { 1198 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_sectors, 1199 s->conf.max_write_zeroes_sectors); 1200 blkcfg.write_zeroes_may_unmap = 1; 1201 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_seg, 1); 1202 } 1203 if (bs->bl.zoned != BLK_Z_NONE) { 1204 switch (bs->bl.zoned) { 1205 case BLK_Z_HM: 1206 blkcfg.zoned.model = VIRTIO_BLK_Z_HM; 1207 break; 1208 case BLK_Z_HA: 1209 blkcfg.zoned.model = VIRTIO_BLK_Z_HA; 1210 break; 1211 default: 1212 g_assert_not_reached(); 1213 } 1214 1215 virtio_stl_p(vdev, &blkcfg.zoned.zone_sectors, 1216 bs->bl.zone_size / 512); 1217 virtio_stl_p(vdev, &blkcfg.zoned.max_active_zones, 1218 bs->bl.max_active_zones); 1219 virtio_stl_p(vdev, &blkcfg.zoned.max_open_zones, 1220 bs->bl.max_open_zones); 1221 virtio_stl_p(vdev, &blkcfg.zoned.write_granularity, blk_size); 1222 virtio_stl_p(vdev, &blkcfg.zoned.max_append_sectors, 1223 bs->bl.max_append_sectors); 1224 } else { 1225 blkcfg.zoned.model = VIRTIO_BLK_Z_NONE; 1226 } 1227 memcpy(config, &blkcfg, s->config_size); 1228 } 1229 1230 static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config) 1231 { 1232 VirtIOBlock *s = VIRTIO_BLK(vdev); 1233 struct virtio_blk_config blkcfg; 1234 1235 memcpy(&blkcfg, config, s->config_size); 1236 1237 blk_set_enable_write_cache(s->blk, blkcfg.wce != 0); 1238 } 1239 1240 static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features, 1241 Error **errp) 1242 { 1243 VirtIOBlock *s = VIRTIO_BLK(vdev); 1244 1245 /* Firstly sync all virtio-blk possible supported features */ 1246 features |= s->host_features; 1247 1248 virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX); 1249 virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY); 1250 virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY); 1251 virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE); 1252 if (!virtio_has_feature(features, VIRTIO_F_VERSION_1)) { 1253 virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT); 1254 /* Added for historical reasons, removing it could break migration. */ 1255 virtio_add_feature(&features, VIRTIO_BLK_F_SCSI); 1256 } 1257 1258 if (blk_enable_write_cache(s->blk) || 1259 (s->conf.x_enable_wce_if_config_wce && 1260 virtio_has_feature(features, VIRTIO_BLK_F_CONFIG_WCE))) { 1261 virtio_add_feature(&features, VIRTIO_BLK_F_WCE); 1262 } 1263 if (!blk_is_writable(s->blk)) { 1264 virtio_add_feature(&features, VIRTIO_BLK_F_RO); 1265 } 1266 if (s->conf.num_queues > 1) { 1267 virtio_add_feature(&features, VIRTIO_BLK_F_MQ); 1268 } 1269 1270 return features; 1271 } 1272 1273 static int virtio_blk_set_status(VirtIODevice *vdev, uint8_t status) 1274 { 1275 VirtIOBlock *s = VIRTIO_BLK(vdev); 1276 1277 if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) { 1278 assert(!s->ioeventfd_started); 1279 } 1280 1281 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1282 return 0; 1283 } 1284 1285 /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send 1286 * cache flushes. Thus, the "auto writethrough" behavior is never 1287 * necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature. 1288 * Leaving it enabled would break the following sequence: 1289 * 1290 * Guest started with "-drive cache=writethrough" 1291 * Guest sets status to 0 1292 * Guest sets DRIVER bit in status field 1293 * Guest reads host features (WCE=0, CONFIG_WCE=1) 1294 * Guest writes guest features (WCE=0, CONFIG_WCE=1) 1295 * Guest writes 1 to the WCE configuration field (writeback mode) 1296 * Guest sets DRIVER_OK bit in status field 1297 * 1298 * s->blk would erroneously be placed in writethrough mode. 1299 */ 1300 if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) { 1301 blk_set_enable_write_cache(s->blk, 1302 virtio_vdev_has_feature(vdev, 1303 VIRTIO_BLK_F_WCE)); 1304 } 1305 return 0; 1306 } 1307 1308 static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f) 1309 { 1310 VirtIOBlock *s = VIRTIO_BLK(vdev); 1311 1312 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 1313 VirtIOBlockReq *req = s->rq; 1314 1315 while (req) { 1316 qemu_put_sbyte(f, 1); 1317 1318 if (s->conf.num_queues > 1) { 1319 qemu_put_be32(f, virtio_get_queue_index(req->vq)); 1320 } 1321 1322 qemu_put_virtqueue_element(vdev, f, &req->elem); 1323 req = req->next; 1324 } 1325 } 1326 1327 qemu_put_sbyte(f, 0); 1328 } 1329 1330 static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f, 1331 int version_id) 1332 { 1333 VirtIOBlock *s = VIRTIO_BLK(vdev); 1334 1335 while (qemu_get_sbyte(f)) { 1336 unsigned nvqs = s->conf.num_queues; 1337 unsigned vq_idx = 0; 1338 VirtIOBlockReq *req; 1339 1340 if (nvqs > 1) { 1341 vq_idx = qemu_get_be32(f); 1342 1343 if (vq_idx >= nvqs) { 1344 error_report("Invalid virtqueue index in request list: %#x", 1345 vq_idx); 1346 return -EINVAL; 1347 } 1348 } 1349 1350 req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq)); 1351 virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req); 1352 1353 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 1354 req->next = s->rq; 1355 s->rq = req; 1356 } 1357 } 1358 1359 return 0; 1360 } 1361 1362 static void virtio_resize_cb(void *opaque) 1363 { 1364 VirtIODevice *vdev = opaque; 1365 1366 assert(qemu_get_current_aio_context() == qemu_get_aio_context()); 1367 virtio_notify_config(vdev); 1368 } 1369 1370 static void virtio_blk_resize(void *opaque) 1371 { 1372 VirtIODevice *vdev = VIRTIO_DEVICE(opaque); 1373 1374 /* 1375 * virtio_notify_config() needs to acquire the BQL, 1376 * so it can't be called from an iothread. Instead, schedule 1377 * it to be run in the main context BH. 1378 */ 1379 aio_bh_schedule_oneshot(qemu_get_aio_context(), virtio_resize_cb, vdev); 1380 } 1381 1382 static void virtio_blk_ioeventfd_detach(VirtIOBlock *s) 1383 { 1384 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1385 1386 for (uint16_t i = 0; i < s->conf.num_queues; i++) { 1387 VirtQueue *vq = virtio_get_queue(vdev, i); 1388 virtio_queue_aio_detach_host_notifier(vq, s->vq_aio_context[i]); 1389 } 1390 } 1391 1392 static void virtio_blk_ioeventfd_attach(VirtIOBlock *s) 1393 { 1394 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1395 1396 for (uint16_t i = 0; i < s->conf.num_queues; i++) { 1397 VirtQueue *vq = virtio_get_queue(vdev, i); 1398 virtio_queue_aio_attach_host_notifier(vq, s->vq_aio_context[i]); 1399 } 1400 } 1401 1402 /* Suspend virtqueue ioeventfd processing during drain */ 1403 static void virtio_blk_drained_begin(void *opaque) 1404 { 1405 VirtIOBlock *s = opaque; 1406 1407 if (s->ioeventfd_started) { 1408 virtio_blk_ioeventfd_detach(s); 1409 } 1410 } 1411 1412 /* Resume virtqueue ioeventfd processing after drain */ 1413 static void virtio_blk_drained_end(void *opaque) 1414 { 1415 VirtIOBlock *s = opaque; 1416 1417 if (s->ioeventfd_started) { 1418 virtio_blk_ioeventfd_attach(s); 1419 } 1420 } 1421 1422 static const BlockDevOps virtio_block_ops = { 1423 .resize_cb = virtio_blk_resize, 1424 .drained_begin = virtio_blk_drained_begin, 1425 .drained_end = virtio_blk_drained_end, 1426 }; 1427 1428 /* Context: BQL held */ 1429 static bool virtio_blk_vq_aio_context_init(VirtIOBlock *s, Error **errp) 1430 { 1431 ERRP_GUARD(); 1432 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1433 VirtIOBlkConf *conf = &s->conf; 1434 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 1435 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 1436 1437 if (conf->iothread && conf->iothread_vq_mapping_list) { 1438 error_setg(errp, 1439 "iothread and iothread-vq-mapping properties cannot be set " 1440 "at the same time"); 1441 return false; 1442 } 1443 1444 if (conf->iothread || conf->iothread_vq_mapping_list) { 1445 if (!k->set_guest_notifiers || !k->ioeventfd_assign) { 1446 error_setg(errp, 1447 "device is incompatible with iothread " 1448 "(transport does not support notifiers)"); 1449 return false; 1450 } 1451 if (!virtio_device_ioeventfd_enabled(vdev)) { 1452 error_setg(errp, "ioeventfd is required for iothread"); 1453 return false; 1454 } 1455 } 1456 1457 s->vq_aio_context = g_new(AioContext *, conf->num_queues); 1458 1459 if (conf->iothread_vq_mapping_list) { 1460 if (!iothread_vq_mapping_apply(conf->iothread_vq_mapping_list, 1461 s->vq_aio_context, 1462 conf->num_queues, 1463 errp)) { 1464 g_free(s->vq_aio_context); 1465 s->vq_aio_context = NULL; 1466 return false; 1467 } 1468 } else if (conf->iothread) { 1469 AioContext *ctx = iothread_get_aio_context(conf->iothread); 1470 for (unsigned i = 0; i < conf->num_queues; i++) { 1471 s->vq_aio_context[i] = ctx; 1472 } 1473 1474 /* Released in virtio_blk_vq_aio_context_cleanup() */ 1475 object_ref(OBJECT(conf->iothread)); 1476 } else { 1477 AioContext *ctx = qemu_get_aio_context(); 1478 for (unsigned i = 0; i < conf->num_queues; i++) { 1479 s->vq_aio_context[i] = ctx; 1480 } 1481 } 1482 1483 return true; 1484 } 1485 1486 /* Context: BQL held */ 1487 static void virtio_blk_vq_aio_context_cleanup(VirtIOBlock *s) 1488 { 1489 VirtIOBlkConf *conf = &s->conf; 1490 1491 assert(!s->ioeventfd_started); 1492 1493 if (conf->iothread_vq_mapping_list) { 1494 iothread_vq_mapping_cleanup(conf->iothread_vq_mapping_list); 1495 } 1496 1497 if (conf->iothread) { 1498 object_unref(OBJECT(conf->iothread)); 1499 } 1500 1501 g_free(s->vq_aio_context); 1502 s->vq_aio_context = NULL; 1503 } 1504 1505 /* Context: BQL held */ 1506 static int virtio_blk_start_ioeventfd(VirtIODevice *vdev) 1507 { 1508 VirtIOBlock *s = VIRTIO_BLK(vdev); 1509 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s))); 1510 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 1511 unsigned i; 1512 unsigned nvqs = s->conf.num_queues; 1513 Error *local_err = NULL; 1514 int r; 1515 1516 if (s->ioeventfd_started || s->ioeventfd_starting) { 1517 return 0; 1518 } 1519 1520 s->ioeventfd_starting = true; 1521 1522 /* Set up guest notifier (irq) */ 1523 r = k->set_guest_notifiers(qbus->parent, nvqs, true); 1524 if (r != 0) { 1525 error_report("virtio-blk failed to set guest notifier (%d), " 1526 "ensure -accel kvm is set.", r); 1527 goto fail_guest_notifiers; 1528 } 1529 1530 /* 1531 * Batch all the host notifiers in a single transaction to avoid 1532 * quadratic time complexity in address_space_update_ioeventfds(). 1533 */ 1534 memory_region_transaction_begin(); 1535 1536 /* Set up virtqueue notify */ 1537 for (i = 0; i < nvqs; i++) { 1538 r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, true); 1539 if (r != 0) { 1540 int j = i; 1541 1542 fprintf(stderr, "virtio-blk failed to set host notifier (%d)\n", r); 1543 while (i--) { 1544 virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false); 1545 } 1546 1547 /* 1548 * The transaction expects the ioeventfds to be open when it 1549 * commits. Do it now, before the cleanup loop. 1550 */ 1551 memory_region_transaction_commit(); 1552 1553 while (j--) { 1554 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), j); 1555 } 1556 goto fail_host_notifiers; 1557 } 1558 } 1559 1560 memory_region_transaction_commit(); 1561 1562 /* 1563 * Try to change the AioContext so that block jobs and other operations can 1564 * co-locate their activity in the same AioContext. If it fails, nevermind. 1565 */ 1566 assert(nvqs > 0); /* enforced during ->realize() */ 1567 r = blk_set_aio_context(s->conf.conf.blk, s->vq_aio_context[0], 1568 &local_err); 1569 if (r < 0) { 1570 warn_report_err(local_err); 1571 } 1572 1573 /* 1574 * These fields must be visible to the IOThread when it processes the 1575 * virtqueue, otherwise it will think ioeventfd has not started yet. 1576 * 1577 * Make sure ->ioeventfd_started is false when blk_set_aio_context() is 1578 * called above so that draining does not cause the host notifier to be 1579 * detached/attached prematurely. 1580 */ 1581 s->ioeventfd_starting = false; 1582 s->ioeventfd_started = true; 1583 smp_wmb(); /* paired with aio_notify_accept() on the read side */ 1584 1585 /* 1586 * Get this show started by hooking up our callbacks. If drained now, 1587 * virtio_blk_drained_end() will do this later. 1588 * Attaching the notifier also kicks the virtqueues, processing any requests 1589 * they may already have. 1590 */ 1591 if (!blk_in_drain(s->conf.conf.blk)) { 1592 virtio_blk_ioeventfd_attach(s); 1593 } 1594 return 0; 1595 1596 fail_host_notifiers: 1597 k->set_guest_notifiers(qbus->parent, nvqs, false); 1598 fail_guest_notifiers: 1599 s->ioeventfd_disabled = true; 1600 s->ioeventfd_starting = false; 1601 return -ENOSYS; 1602 } 1603 1604 /* Stop notifications for new requests from guest. 1605 * 1606 * Context: BH in IOThread 1607 */ 1608 static void virtio_blk_ioeventfd_stop_vq_bh(void *opaque) 1609 { 1610 VirtQueue *vq = opaque; 1611 EventNotifier *host_notifier = virtio_queue_get_host_notifier(vq); 1612 1613 virtio_queue_aio_detach_host_notifier(vq, qemu_get_current_aio_context()); 1614 1615 /* 1616 * Test and clear notifier after disabling event, in case poll callback 1617 * didn't have time to run. 1618 */ 1619 virtio_queue_host_notifier_read(host_notifier); 1620 } 1621 1622 /* Context: BQL held */ 1623 static void virtio_blk_stop_ioeventfd(VirtIODevice *vdev) 1624 { 1625 VirtIOBlock *s = VIRTIO_BLK(vdev); 1626 BusState *qbus = qdev_get_parent_bus(DEVICE(s)); 1627 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 1628 unsigned i; 1629 unsigned nvqs = s->conf.num_queues; 1630 1631 if (!s->ioeventfd_started || s->ioeventfd_stopping) { 1632 return; 1633 } 1634 1635 /* Better luck next time. */ 1636 if (s->ioeventfd_disabled) { 1637 s->ioeventfd_disabled = false; 1638 s->ioeventfd_started = false; 1639 return; 1640 } 1641 s->ioeventfd_stopping = true; 1642 1643 if (!blk_in_drain(s->conf.conf.blk)) { 1644 for (i = 0; i < nvqs; i++) { 1645 VirtQueue *vq = virtio_get_queue(vdev, i); 1646 AioContext *ctx = s->vq_aio_context[i]; 1647 1648 aio_wait_bh_oneshot(ctx, virtio_blk_ioeventfd_stop_vq_bh, vq); 1649 } 1650 } 1651 1652 /* 1653 * Batch all the host notifiers in a single transaction to avoid 1654 * quadratic time complexity in address_space_update_ioeventfds(). 1655 */ 1656 memory_region_transaction_begin(); 1657 1658 for (i = 0; i < nvqs; i++) { 1659 virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false); 1660 } 1661 1662 /* 1663 * The transaction expects the ioeventfds to be open when it 1664 * commits. Do it now, before the cleanup loop. 1665 */ 1666 memory_region_transaction_commit(); 1667 1668 for (i = 0; i < nvqs; i++) { 1669 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), i); 1670 } 1671 1672 /* 1673 * Set ->ioeventfd_started to false before draining so that host notifiers 1674 * are not detached/attached anymore. 1675 */ 1676 s->ioeventfd_started = false; 1677 1678 /* Wait for virtio_blk_dma_restart_bh() and in flight I/O to complete */ 1679 blk_drain(s->conf.conf.blk); 1680 1681 /* 1682 * Try to switch bs back to the QEMU main loop. If other users keep the 1683 * BlockBackend in the iothread, that's ok 1684 */ 1685 blk_set_aio_context(s->conf.conf.blk, qemu_get_aio_context(), NULL); 1686 1687 /* Clean up guest notifier (irq) */ 1688 k->set_guest_notifiers(qbus->parent, nvqs, false); 1689 1690 s->ioeventfd_stopping = false; 1691 } 1692 1693 static void virtio_blk_device_realize(DeviceState *dev, Error **errp) 1694 { 1695 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1696 VirtIOBlock *s = VIRTIO_BLK(dev); 1697 VirtIOBlkConf *conf = &s->conf; 1698 BlockDriverState *bs; 1699 Error *err = NULL; 1700 unsigned i; 1701 1702 if (!conf->conf.blk) { 1703 error_setg(errp, "drive property not set"); 1704 return; 1705 } 1706 if (!blk_is_inserted(conf->conf.blk)) { 1707 error_setg(errp, "Device needs media, but drive is empty"); 1708 return; 1709 } 1710 if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) { 1711 conf->num_queues = 1; 1712 } 1713 if (!conf->num_queues) { 1714 error_setg(errp, "num-queues property must be larger than 0"); 1715 return; 1716 } 1717 if (conf->queue_size <= 2) { 1718 error_setg(errp, "invalid queue-size property (%" PRIu16 "), " 1719 "must be > 2", conf->queue_size); 1720 return; 1721 } 1722 if (!is_power_of_2(conf->queue_size) || 1723 conf->queue_size > VIRTQUEUE_MAX_SIZE) { 1724 error_setg(errp, "invalid queue-size property (%" PRIu16 "), " 1725 "must be a power of 2 (max %d)", 1726 conf->queue_size, VIRTQUEUE_MAX_SIZE); 1727 return; 1728 } 1729 1730 if (!blkconf_apply_backend_options(&conf->conf, 1731 !blk_supports_write_perm(conf->conf.blk), 1732 true, errp)) { 1733 return; 1734 } 1735 s->original_wce = blk_enable_write_cache(conf->conf.blk); 1736 if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) { 1737 return; 1738 } 1739 1740 if (!blkconf_blocksizes(&conf->conf, errp)) { 1741 return; 1742 } 1743 1744 bs = blk_bs(conf->conf.blk); 1745 if (bs->bl.zoned != BLK_Z_NONE) { 1746 virtio_add_feature(&s->host_features, VIRTIO_BLK_F_ZONED); 1747 if (bs->bl.zoned == BLK_Z_HM) { 1748 virtio_clear_feature(&s->host_features, VIRTIO_BLK_F_DISCARD); 1749 } 1750 } 1751 1752 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD) && 1753 (!conf->max_discard_sectors || 1754 conf->max_discard_sectors > BDRV_REQUEST_MAX_SECTORS)) { 1755 error_setg(errp, "invalid max-discard-sectors property (%" PRIu32 ")" 1756 ", must be between 1 and %d", 1757 conf->max_discard_sectors, (int)BDRV_REQUEST_MAX_SECTORS); 1758 return; 1759 } 1760 1761 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES) && 1762 (!conf->max_write_zeroes_sectors || 1763 conf->max_write_zeroes_sectors > BDRV_REQUEST_MAX_SECTORS)) { 1764 error_setg(errp, "invalid max-write-zeroes-sectors property (%" PRIu32 1765 "), must be between 1 and %d", 1766 conf->max_write_zeroes_sectors, 1767 (int)BDRV_REQUEST_MAX_SECTORS); 1768 return; 1769 } 1770 1771 s->config_size = virtio_get_config_size(&virtio_blk_cfg_size_params, 1772 s->host_features); 1773 virtio_init(vdev, VIRTIO_ID_BLOCK, s->config_size); 1774 1775 qemu_mutex_init(&s->rq_lock); 1776 1777 s->blk = conf->conf.blk; 1778 s->rq = NULL; 1779 s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1; 1780 1781 for (i = 0; i < conf->num_queues; i++) { 1782 virtio_add_queue(vdev, conf->queue_size, virtio_blk_handle_output); 1783 } 1784 qemu_coroutine_inc_pool_size(conf->num_queues * conf->queue_size / 2); 1785 1786 /* Don't start ioeventfd if transport does not support notifiers. */ 1787 if (!virtio_device_ioeventfd_enabled(vdev)) { 1788 s->ioeventfd_disabled = true; 1789 } 1790 1791 virtio_blk_vq_aio_context_init(s, &err); 1792 if (err != NULL) { 1793 error_propagate(errp, err); 1794 for (i = 0; i < conf->num_queues; i++) { 1795 virtio_del_queue(vdev, i); 1796 } 1797 virtio_cleanup(vdev); 1798 return; 1799 } 1800 1801 /* 1802 * This must be after virtio_init() so virtio_blk_dma_restart_cb() gets 1803 * called after ->start_ioeventfd() has already set blk's AioContext. 1804 */ 1805 s->change = 1806 qdev_add_vm_change_state_handler(dev, virtio_blk_dma_restart_cb, NULL, s); 1807 1808 blk_ram_registrar_init(&s->blk_ram_registrar, s->blk); 1809 blk_set_dev_ops(s->blk, &virtio_block_ops, s); 1810 1811 blk_iostatus_enable(s->blk); 1812 1813 add_boot_device_lchs(dev, "/disk@0,0", 1814 conf->conf.lcyls, 1815 conf->conf.lheads, 1816 conf->conf.lsecs); 1817 } 1818 1819 static void virtio_blk_device_unrealize(DeviceState *dev) 1820 { 1821 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1822 VirtIOBlock *s = VIRTIO_BLK(dev); 1823 VirtIOBlkConf *conf = &s->conf; 1824 unsigned i; 1825 1826 blk_drain(s->blk); 1827 del_boot_device_lchs(dev, "/disk@0,0"); 1828 virtio_blk_vq_aio_context_cleanup(s); 1829 for (i = 0; i < conf->num_queues; i++) { 1830 virtio_del_queue(vdev, i); 1831 } 1832 qemu_coroutine_dec_pool_size(conf->num_queues * conf->queue_size / 2); 1833 qemu_mutex_destroy(&s->rq_lock); 1834 blk_ram_registrar_destroy(&s->blk_ram_registrar); 1835 qemu_del_vm_change_state_handler(s->change); 1836 blockdev_mark_auto_del(s->blk); 1837 virtio_cleanup(vdev); 1838 } 1839 1840 static void virtio_blk_instance_init(Object *obj) 1841 { 1842 VirtIOBlock *s = VIRTIO_BLK(obj); 1843 1844 device_add_bootindex_property(obj, &s->conf.conf.bootindex, 1845 "bootindex", "/disk@0,0", 1846 DEVICE(obj)); 1847 } 1848 1849 static const VMStateDescription vmstate_virtio_blk = { 1850 .name = "virtio-blk", 1851 .minimum_version_id = 2, 1852 .version_id = 2, 1853 .fields = (const VMStateField[]) { 1854 VMSTATE_VIRTIO_DEVICE, 1855 VMSTATE_END_OF_LIST() 1856 }, 1857 }; 1858 1859 static const Property virtio_blk_properties[] = { 1860 DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf), 1861 DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf), 1862 DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf), 1863 DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial), 1864 DEFINE_PROP_BIT64("config-wce", VirtIOBlock, host_features, 1865 VIRTIO_BLK_F_CONFIG_WCE, true), 1866 DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0, 1867 true), 1868 DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues, 1869 VIRTIO_BLK_AUTO_NUM_QUEUES), 1870 DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 256), 1871 DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, true), 1872 DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD, 1873 IOThread *), 1874 DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST("iothread-vq-mapping", VirtIOBlock, 1875 conf.iothread_vq_mapping_list), 1876 DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features, 1877 VIRTIO_BLK_F_DISCARD, true), 1878 DEFINE_PROP_BOOL("report-discard-granularity", VirtIOBlock, 1879 conf.report_discard_granularity, true), 1880 DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features, 1881 VIRTIO_BLK_F_WRITE_ZEROES, true), 1882 DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock, 1883 conf.max_discard_sectors, BDRV_REQUEST_MAX_SECTORS), 1884 DEFINE_PROP_UINT32("max-write-zeroes-sectors", VirtIOBlock, 1885 conf.max_write_zeroes_sectors, BDRV_REQUEST_MAX_SECTORS), 1886 DEFINE_PROP_BOOL("x-enable-wce-if-config-wce", VirtIOBlock, 1887 conf.x_enable_wce_if_config_wce, true), 1888 }; 1889 1890 static void virtio_blk_class_init(ObjectClass *klass, const void *data) 1891 { 1892 DeviceClass *dc = DEVICE_CLASS(klass); 1893 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 1894 1895 device_class_set_props(dc, virtio_blk_properties); 1896 dc->vmsd = &vmstate_virtio_blk; 1897 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 1898 vdc->realize = virtio_blk_device_realize; 1899 vdc->unrealize = virtio_blk_device_unrealize; 1900 vdc->get_config = virtio_blk_update_config; 1901 vdc->set_config = virtio_blk_set_config; 1902 vdc->get_features = virtio_blk_get_features; 1903 vdc->set_status = virtio_blk_set_status; 1904 vdc->reset = virtio_blk_reset; 1905 vdc->save = virtio_blk_save_device; 1906 vdc->load = virtio_blk_load_device; 1907 vdc->start_ioeventfd = virtio_blk_start_ioeventfd; 1908 vdc->stop_ioeventfd = virtio_blk_stop_ioeventfd; 1909 } 1910 1911 static const TypeInfo virtio_blk_info = { 1912 .name = TYPE_VIRTIO_BLK, 1913 .parent = TYPE_VIRTIO_DEVICE, 1914 .instance_size = sizeof(VirtIOBlock), 1915 .instance_init = virtio_blk_instance_init, 1916 .class_init = virtio_blk_class_init, 1917 .class_size = sizeof(VirtIOBlkClass), 1918 }; 1919 1920 static void virtio_register_types(void) 1921 { 1922 type_register_static(&virtio_blk_info); 1923 } 1924 1925 type_init(virtio_register_types) 1926