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 "sysemu/blockdev.h" 26 #include "sysemu/block-ram-registrar.h" 27 #include "sysemu/sysemu.h" 28 #include "sysemu/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/virtio-access.h" 37 #include "hw/virtio/virtio-blk-common.h" 38 #include "qemu/coroutine.h" 39 40 static void virtio_blk_ioeventfd_attach(VirtIOBlock *s); 41 42 static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq, 43 VirtIOBlockReq *req) 44 { 45 req->dev = s; 46 req->vq = vq; 47 req->qiov.size = 0; 48 req->in_len = 0; 49 req->next = NULL; 50 req->mr_next = NULL; 51 } 52 53 static void virtio_blk_free_request(VirtIOBlockReq *req) 54 { 55 g_free(req); 56 } 57 58 static void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status) 59 { 60 VirtIOBlock *s = req->dev; 61 VirtIODevice *vdev = VIRTIO_DEVICE(s); 62 63 trace_virtio_blk_req_complete(vdev, req, status); 64 65 stb_p(&req->in->status, status); 66 iov_discard_undo(&req->inhdr_undo); 67 iov_discard_undo(&req->outhdr_undo); 68 virtqueue_push(req->vq, &req->elem, req->in_len); 69 if (qemu_in_iothread()) { 70 virtio_notify_irqfd(vdev, req->vq); 71 } else { 72 virtio_notify(vdev, req->vq); 73 } 74 } 75 76 static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, 77 bool is_read, bool acct_failed) 78 { 79 VirtIOBlock *s = req->dev; 80 BlockErrorAction action = blk_get_error_action(s->blk, is_read, error); 81 82 if (action == BLOCK_ERROR_ACTION_STOP) { 83 /* Break the link as the next request is going to be parsed from the 84 * ring again. Otherwise we may end up doing a double completion! */ 85 req->mr_next = NULL; 86 87 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 88 req->next = s->rq; 89 s->rq = req; 90 } 91 } else if (action == BLOCK_ERROR_ACTION_REPORT) { 92 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); 93 if (acct_failed) { 94 block_acct_failed(blk_get_stats(s->blk), &req->acct); 95 } 96 virtio_blk_free_request(req); 97 } 98 99 blk_error_action(s->blk, action, is_read, error); 100 return action != BLOCK_ERROR_ACTION_IGNORE; 101 } 102 103 static void virtio_blk_rw_complete(void *opaque, int ret) 104 { 105 VirtIOBlockReq *next = opaque; 106 VirtIOBlock *s = next->dev; 107 VirtIODevice *vdev = VIRTIO_DEVICE(s); 108 109 while (next) { 110 VirtIOBlockReq *req = next; 111 next = req->mr_next; 112 trace_virtio_blk_rw_complete(vdev, req, ret); 113 114 if (req->qiov.nalloc != -1) { 115 /* If nalloc is != -1 req->qiov is a local copy of the original 116 * external iovec. It was allocated in submit_requests to be 117 * able to merge requests. */ 118 qemu_iovec_destroy(&req->qiov); 119 } 120 121 if (ret) { 122 int p = virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type); 123 bool is_read = !(p & VIRTIO_BLK_T_OUT); 124 /* Note that memory may be dirtied on read failure. If the 125 * virtio request is not completed here, as is the case for 126 * BLOCK_ERROR_ACTION_STOP, the memory may not be copied 127 * correctly during live migration. While this is ugly, 128 * it is acceptable because the device is free to write to 129 * the memory until the request is completed (which will 130 * happen on the other side of the migration). 131 */ 132 if (virtio_blk_handle_rw_error(req, -ret, is_read, true)) { 133 continue; 134 } 135 } 136 137 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 138 block_acct_done(blk_get_stats(s->blk), &req->acct); 139 virtio_blk_free_request(req); 140 } 141 } 142 143 static void virtio_blk_flush_complete(void *opaque, int ret) 144 { 145 VirtIOBlockReq *req = opaque; 146 VirtIOBlock *s = req->dev; 147 148 if (ret && virtio_blk_handle_rw_error(req, -ret, 0, true)) { 149 return; 150 } 151 152 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 153 block_acct_done(blk_get_stats(s->blk), &req->acct); 154 virtio_blk_free_request(req); 155 } 156 157 static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret) 158 { 159 VirtIOBlockReq *req = opaque; 160 VirtIOBlock *s = req->dev; 161 bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) & 162 ~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES; 163 164 if (ret && virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) { 165 return; 166 } 167 168 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 169 if (is_write_zeroes) { 170 block_acct_done(blk_get_stats(s->blk), &req->acct); 171 } 172 virtio_blk_free_request(req); 173 } 174 175 static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq) 176 { 177 VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq)); 178 179 if (req) { 180 virtio_blk_init_request(s, vq, req); 181 } 182 return req; 183 } 184 185 static void virtio_blk_handle_scsi(VirtIOBlockReq *req) 186 { 187 int status; 188 struct virtio_scsi_inhdr *scsi; 189 VirtIOBlock *blk = req->dev; 190 VirtIODevice *vdev = VIRTIO_DEVICE(blk); 191 VirtQueueElement *elem = &req->elem; 192 193 /* 194 * We require at least one output segment each for the virtio_blk_outhdr 195 * and the SCSI command block. 196 * 197 * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr 198 * and the sense buffer pointer in the input segments. 199 */ 200 if (elem->out_num < 2 || elem->in_num < 3) { 201 status = VIRTIO_BLK_S_IOERR; 202 goto fail; 203 } 204 205 /* 206 * The scsi inhdr is placed in the second-to-last input segment, just 207 * before the regular inhdr. 208 * 209 * Just put anything nonzero so that the ioctl fails in the guest. 210 */ 211 scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base; 212 virtio_stl_p(vdev, &scsi->errors, 255); 213 status = VIRTIO_BLK_S_UNSUPP; 214 215 fail: 216 virtio_blk_req_complete(req, status); 217 virtio_blk_free_request(req); 218 } 219 220 static inline void submit_requests(VirtIOBlock *s, MultiReqBuffer *mrb, 221 int start, int num_reqs, int niov) 222 { 223 BlockBackend *blk = s->blk; 224 QEMUIOVector *qiov = &mrb->reqs[start]->qiov; 225 int64_t sector_num = mrb->reqs[start]->sector_num; 226 bool is_write = mrb->is_write; 227 BdrvRequestFlags flags = 0; 228 229 if (num_reqs > 1) { 230 int i; 231 struct iovec *tmp_iov = qiov->iov; 232 int tmp_niov = qiov->niov; 233 234 /* mrb->reqs[start]->qiov was initialized from external so we can't 235 * modify it here. We need to initialize it locally and then add the 236 * external iovecs. */ 237 qemu_iovec_init(qiov, niov); 238 239 for (i = 0; i < tmp_niov; i++) { 240 qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len); 241 } 242 243 for (i = start + 1; i < start + num_reqs; i++) { 244 qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0, 245 mrb->reqs[i]->qiov.size); 246 mrb->reqs[i - 1]->mr_next = mrb->reqs[i]; 247 } 248 249 trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev), 250 mrb, start, num_reqs, 251 sector_num << BDRV_SECTOR_BITS, 252 qiov->size, is_write); 253 block_acct_merge_done(blk_get_stats(blk), 254 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ, 255 num_reqs - 1); 256 } 257 258 if (blk_ram_registrar_ok(&s->blk_ram_registrar)) { 259 flags |= BDRV_REQ_REGISTERED_BUF; 260 } 261 262 if (is_write) { 263 blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, 264 flags, virtio_blk_rw_complete, 265 mrb->reqs[start]); 266 } else { 267 blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, 268 flags, virtio_blk_rw_complete, 269 mrb->reqs[start]); 270 } 271 } 272 273 static int multireq_compare(const void *a, const void *b) 274 { 275 const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a, 276 *req2 = *(VirtIOBlockReq **)b; 277 278 /* 279 * Note that we can't simply subtract sector_num1 from sector_num2 280 * here as that could overflow the return value. 281 */ 282 if (req1->sector_num > req2->sector_num) { 283 return 1; 284 } else if (req1->sector_num < req2->sector_num) { 285 return -1; 286 } else { 287 return 0; 288 } 289 } 290 291 static void virtio_blk_submit_multireq(VirtIOBlock *s, MultiReqBuffer *mrb) 292 { 293 int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0; 294 uint32_t max_transfer; 295 int64_t sector_num = 0; 296 297 if (mrb->num_reqs == 1) { 298 submit_requests(s, mrb, 0, 1, -1); 299 mrb->num_reqs = 0; 300 return; 301 } 302 303 max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk); 304 305 qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs), 306 &multireq_compare); 307 308 for (i = 0; i < mrb->num_reqs; i++) { 309 VirtIOBlockReq *req = mrb->reqs[i]; 310 if (num_reqs > 0) { 311 /* 312 * NOTE: We cannot merge the requests in below situations: 313 * 1. requests are not sequential 314 * 2. merge would exceed maximum number of IOVs 315 * 3. merge would exceed maximum transfer length of backend device 316 */ 317 if (sector_num + nb_sectors != req->sector_num || 318 niov > blk_get_max_iov(s->blk) - req->qiov.niov || 319 req->qiov.size > max_transfer || 320 nb_sectors > (max_transfer - 321 req->qiov.size) / BDRV_SECTOR_SIZE) { 322 submit_requests(s, mrb, start, num_reqs, niov); 323 num_reqs = 0; 324 } 325 } 326 327 if (num_reqs == 0) { 328 sector_num = req->sector_num; 329 nb_sectors = niov = 0; 330 start = i; 331 } 332 333 nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE; 334 niov += req->qiov.niov; 335 num_reqs++; 336 } 337 338 submit_requests(s, mrb, start, num_reqs, niov); 339 mrb->num_reqs = 0; 340 } 341 342 static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) 343 { 344 VirtIOBlock *s = req->dev; 345 346 block_acct_start(blk_get_stats(s->blk), &req->acct, 0, 347 BLOCK_ACCT_FLUSH); 348 349 /* 350 * Make sure all outstanding writes are posted to the backing device. 351 */ 352 if (mrb->is_write && mrb->num_reqs > 0) { 353 virtio_blk_submit_multireq(s, mrb); 354 } 355 blk_aio_flush(s->blk, virtio_blk_flush_complete, req); 356 } 357 358 static bool virtio_blk_sect_range_ok(VirtIOBlock *dev, 359 uint64_t sector, size_t size) 360 { 361 uint64_t nb_sectors = size >> BDRV_SECTOR_BITS; 362 uint64_t total_sectors; 363 364 if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) { 365 return false; 366 } 367 if (sector & dev->sector_mask) { 368 return false; 369 } 370 if (size % dev->conf.conf.logical_block_size) { 371 return false; 372 } 373 blk_get_geometry(dev->blk, &total_sectors); 374 if (sector > total_sectors || nb_sectors > total_sectors - sector) { 375 return false; 376 } 377 return true; 378 } 379 380 static uint8_t virtio_blk_handle_discard_write_zeroes(VirtIOBlockReq *req, 381 struct virtio_blk_discard_write_zeroes *dwz_hdr, bool is_write_zeroes) 382 { 383 VirtIOBlock *s = req->dev; 384 VirtIODevice *vdev = VIRTIO_DEVICE(s); 385 uint64_t sector; 386 uint32_t num_sectors, flags, max_sectors; 387 uint8_t err_status; 388 int bytes; 389 390 sector = virtio_ldq_p(vdev, &dwz_hdr->sector); 391 num_sectors = virtio_ldl_p(vdev, &dwz_hdr->num_sectors); 392 flags = virtio_ldl_p(vdev, &dwz_hdr->flags); 393 max_sectors = is_write_zeroes ? s->conf.max_write_zeroes_sectors : 394 s->conf.max_discard_sectors; 395 396 /* 397 * max_sectors is at most BDRV_REQUEST_MAX_SECTORS, this check 398 * make us sure that "num_sectors << BDRV_SECTOR_BITS" can fit in 399 * the integer variable. 400 */ 401 if (unlikely(num_sectors > max_sectors)) { 402 err_status = VIRTIO_BLK_S_IOERR; 403 goto err; 404 } 405 406 bytes = num_sectors << BDRV_SECTOR_BITS; 407 408 if (unlikely(!virtio_blk_sect_range_ok(s, sector, bytes))) { 409 err_status = VIRTIO_BLK_S_IOERR; 410 goto err; 411 } 412 413 /* 414 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for discard 415 * and write zeroes commands if any unknown flag is set. 416 */ 417 if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { 418 err_status = VIRTIO_BLK_S_UNSUPP; 419 goto err; 420 } 421 422 if (is_write_zeroes) { /* VIRTIO_BLK_T_WRITE_ZEROES */ 423 int blk_aio_flags = 0; 424 425 if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) { 426 blk_aio_flags |= BDRV_REQ_MAY_UNMAP; 427 } 428 429 block_acct_start(blk_get_stats(s->blk), &req->acct, bytes, 430 BLOCK_ACCT_WRITE); 431 432 blk_aio_pwrite_zeroes(s->blk, sector << BDRV_SECTOR_BITS, 433 bytes, blk_aio_flags, 434 virtio_blk_discard_write_zeroes_complete, req); 435 } else { /* VIRTIO_BLK_T_DISCARD */ 436 /* 437 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for 438 * discard commands if the unmap flag is set. 439 */ 440 if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { 441 err_status = VIRTIO_BLK_S_UNSUPP; 442 goto err; 443 } 444 445 blk_aio_pdiscard(s->blk, sector << BDRV_SECTOR_BITS, bytes, 446 virtio_blk_discard_write_zeroes_complete, req); 447 } 448 449 return VIRTIO_BLK_S_OK; 450 451 err: 452 if (is_write_zeroes) { 453 block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_WRITE); 454 } 455 return err_status; 456 } 457 458 typedef struct ZoneCmdData { 459 VirtIOBlockReq *req; 460 struct iovec *in_iov; 461 unsigned in_num; 462 union { 463 struct { 464 unsigned int nr_zones; 465 BlockZoneDescriptor *zones; 466 } zone_report_data; 467 struct { 468 int64_t offset; 469 } zone_append_data; 470 }; 471 } ZoneCmdData; 472 473 /* 474 * check zoned_request: error checking before issuing requests. If all checks 475 * passed, return true. 476 * append: true if only zone append requests issued. 477 */ 478 static bool check_zoned_request(VirtIOBlock *s, int64_t offset, int64_t len, 479 bool append, uint8_t *status) { 480 BlockDriverState *bs = blk_bs(s->blk); 481 int index; 482 483 if (!virtio_has_feature(s->host_features, VIRTIO_BLK_F_ZONED)) { 484 *status = VIRTIO_BLK_S_UNSUPP; 485 return false; 486 } 487 488 if (offset < 0 || len < 0 || len > (bs->total_sectors << BDRV_SECTOR_BITS) 489 || offset > (bs->total_sectors << BDRV_SECTOR_BITS) - len) { 490 *status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 491 return false; 492 } 493 494 if (append) { 495 if (bs->bl.write_granularity) { 496 if ((offset % bs->bl.write_granularity) != 0) { 497 *status = VIRTIO_BLK_S_ZONE_UNALIGNED_WP; 498 return false; 499 } 500 } 501 502 index = offset / bs->bl.zone_size; 503 if (BDRV_ZT_IS_CONV(bs->wps->wp[index])) { 504 *status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 505 return false; 506 } 507 508 if (len / 512 > bs->bl.max_append_sectors) { 509 if (bs->bl.max_append_sectors == 0) { 510 *status = VIRTIO_BLK_S_UNSUPP; 511 } else { 512 *status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 513 } 514 return false; 515 } 516 } 517 return true; 518 } 519 520 static void virtio_blk_zone_report_complete(void *opaque, int ret) 521 { 522 ZoneCmdData *data = opaque; 523 VirtIOBlockReq *req = data->req; 524 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 525 struct iovec *in_iov = data->in_iov; 526 unsigned in_num = data->in_num; 527 int64_t zrp_size, n, j = 0; 528 int64_t nz = data->zone_report_data.nr_zones; 529 int8_t err_status = VIRTIO_BLK_S_OK; 530 struct virtio_blk_zone_report zrp_hdr = (struct virtio_blk_zone_report) { 531 .nr_zones = cpu_to_le64(nz), 532 }; 533 534 trace_virtio_blk_zone_report_complete(vdev, req, nz, ret); 535 if (ret) { 536 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 537 goto out; 538 } 539 540 zrp_size = sizeof(struct virtio_blk_zone_report) 541 + sizeof(struct virtio_blk_zone_descriptor) * nz; 542 n = iov_from_buf(in_iov, in_num, 0, &zrp_hdr, sizeof(zrp_hdr)); 543 if (n != sizeof(zrp_hdr)) { 544 virtio_error(vdev, "Driver provided input buffer that is too small!"); 545 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 546 goto out; 547 } 548 549 for (size_t i = sizeof(zrp_hdr); i < zrp_size; 550 i += sizeof(struct virtio_blk_zone_descriptor), ++j) { 551 struct virtio_blk_zone_descriptor desc = 552 (struct virtio_blk_zone_descriptor) { 553 .z_start = cpu_to_le64(data->zone_report_data.zones[j].start 554 >> BDRV_SECTOR_BITS), 555 .z_cap = cpu_to_le64(data->zone_report_data.zones[j].cap 556 >> BDRV_SECTOR_BITS), 557 .z_wp = cpu_to_le64(data->zone_report_data.zones[j].wp 558 >> BDRV_SECTOR_BITS), 559 }; 560 561 switch (data->zone_report_data.zones[j].type) { 562 case BLK_ZT_CONV: 563 desc.z_type = VIRTIO_BLK_ZT_CONV; 564 break; 565 case BLK_ZT_SWR: 566 desc.z_type = VIRTIO_BLK_ZT_SWR; 567 break; 568 case BLK_ZT_SWP: 569 desc.z_type = VIRTIO_BLK_ZT_SWP; 570 break; 571 default: 572 g_assert_not_reached(); 573 } 574 575 switch (data->zone_report_data.zones[j].state) { 576 case BLK_ZS_RDONLY: 577 desc.z_state = VIRTIO_BLK_ZS_RDONLY; 578 break; 579 case BLK_ZS_OFFLINE: 580 desc.z_state = VIRTIO_BLK_ZS_OFFLINE; 581 break; 582 case BLK_ZS_EMPTY: 583 desc.z_state = VIRTIO_BLK_ZS_EMPTY; 584 break; 585 case BLK_ZS_CLOSED: 586 desc.z_state = VIRTIO_BLK_ZS_CLOSED; 587 break; 588 case BLK_ZS_FULL: 589 desc.z_state = VIRTIO_BLK_ZS_FULL; 590 break; 591 case BLK_ZS_EOPEN: 592 desc.z_state = VIRTIO_BLK_ZS_EOPEN; 593 break; 594 case BLK_ZS_IOPEN: 595 desc.z_state = VIRTIO_BLK_ZS_IOPEN; 596 break; 597 case BLK_ZS_NOT_WP: 598 desc.z_state = VIRTIO_BLK_ZS_NOT_WP; 599 break; 600 default: 601 g_assert_not_reached(); 602 } 603 604 /* TODO: it takes O(n^2) time complexity. Optimizations required. */ 605 n = iov_from_buf(in_iov, in_num, i, &desc, sizeof(desc)); 606 if (n != sizeof(desc)) { 607 virtio_error(vdev, "Driver provided input buffer " 608 "for descriptors that is too small!"); 609 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 610 } 611 } 612 613 out: 614 virtio_blk_req_complete(req, err_status); 615 virtio_blk_free_request(req); 616 g_free(data->zone_report_data.zones); 617 g_free(data); 618 } 619 620 static void virtio_blk_handle_zone_report(VirtIOBlockReq *req, 621 struct iovec *in_iov, 622 unsigned in_num) 623 { 624 VirtIOBlock *s = req->dev; 625 VirtIODevice *vdev = VIRTIO_DEVICE(s); 626 unsigned int nr_zones; 627 ZoneCmdData *data; 628 int64_t zone_size, offset; 629 uint8_t err_status; 630 631 if (req->in_len < sizeof(struct virtio_blk_inhdr) + 632 sizeof(struct virtio_blk_zone_report) + 633 sizeof(struct virtio_blk_zone_descriptor)) { 634 virtio_error(vdev, "in buffer too small for zone report"); 635 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 636 goto out; 637 } 638 639 /* start byte offset of the zone report */ 640 offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS; 641 if (!check_zoned_request(s, offset, 0, false, &err_status)) { 642 goto out; 643 } 644 nr_zones = (req->in_len - sizeof(struct virtio_blk_inhdr) - 645 sizeof(struct virtio_blk_zone_report)) / 646 sizeof(struct virtio_blk_zone_descriptor); 647 trace_virtio_blk_handle_zone_report(vdev, req, 648 offset >> BDRV_SECTOR_BITS, nr_zones); 649 650 zone_size = sizeof(BlockZoneDescriptor) * nr_zones; 651 data = g_malloc(sizeof(ZoneCmdData)); 652 data->req = req; 653 data->in_iov = in_iov; 654 data->in_num = in_num; 655 data->zone_report_data.nr_zones = nr_zones; 656 data->zone_report_data.zones = g_malloc(zone_size), 657 658 blk_aio_zone_report(s->blk, offset, &data->zone_report_data.nr_zones, 659 data->zone_report_data.zones, 660 virtio_blk_zone_report_complete, data); 661 return; 662 out: 663 virtio_blk_req_complete(req, err_status); 664 virtio_blk_free_request(req); 665 } 666 667 static void virtio_blk_zone_mgmt_complete(void *opaque, int ret) 668 { 669 VirtIOBlockReq *req = opaque; 670 VirtIOBlock *s = req->dev; 671 VirtIODevice *vdev = VIRTIO_DEVICE(s); 672 int8_t err_status = VIRTIO_BLK_S_OK; 673 trace_virtio_blk_zone_mgmt_complete(vdev, req,ret); 674 675 if (ret) { 676 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 677 } 678 679 virtio_blk_req_complete(req, err_status); 680 virtio_blk_free_request(req); 681 } 682 683 static int virtio_blk_handle_zone_mgmt(VirtIOBlockReq *req, BlockZoneOp op) 684 { 685 VirtIOBlock *s = req->dev; 686 VirtIODevice *vdev = VIRTIO_DEVICE(s); 687 BlockDriverState *bs = blk_bs(s->blk); 688 int64_t offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS; 689 uint64_t len; 690 uint64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS; 691 uint8_t err_status = VIRTIO_BLK_S_OK; 692 693 uint32_t type = virtio_ldl_p(vdev, &req->out.type); 694 if (type == VIRTIO_BLK_T_ZONE_RESET_ALL) { 695 /* Entire drive capacity */ 696 offset = 0; 697 len = capacity; 698 trace_virtio_blk_handle_zone_reset_all(vdev, req, 0, 699 bs->total_sectors); 700 } else { 701 if (bs->bl.zone_size > capacity - offset) { 702 /* The zoned device allows the last smaller zone. */ 703 len = capacity - bs->bl.zone_size * (bs->bl.nr_zones - 1ull); 704 } else { 705 len = bs->bl.zone_size; 706 } 707 trace_virtio_blk_handle_zone_mgmt(vdev, req, op, 708 offset >> BDRV_SECTOR_BITS, 709 len >> BDRV_SECTOR_BITS); 710 } 711 712 if (!check_zoned_request(s, offset, len, false, &err_status)) { 713 goto out; 714 } 715 716 blk_aio_zone_mgmt(s->blk, op, offset, len, 717 virtio_blk_zone_mgmt_complete, req); 718 719 return 0; 720 out: 721 virtio_blk_req_complete(req, err_status); 722 virtio_blk_free_request(req); 723 return err_status; 724 } 725 726 static void virtio_blk_zone_append_complete(void *opaque, int ret) 727 { 728 ZoneCmdData *data = opaque; 729 VirtIOBlockReq *req = data->req; 730 VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); 731 int64_t append_sector, n; 732 uint8_t err_status = VIRTIO_BLK_S_OK; 733 734 if (ret) { 735 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 736 goto out; 737 } 738 739 virtio_stq_p(vdev, &append_sector, 740 data->zone_append_data.offset >> BDRV_SECTOR_BITS); 741 n = iov_from_buf(data->in_iov, data->in_num, 0, &append_sector, 742 sizeof(append_sector)); 743 if (n != sizeof(append_sector)) { 744 virtio_error(vdev, "Driver provided input buffer less than size of " 745 "append_sector"); 746 err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; 747 goto out; 748 } 749 trace_virtio_blk_zone_append_complete(vdev, req, append_sector, ret); 750 751 out: 752 virtio_blk_req_complete(req, err_status); 753 virtio_blk_free_request(req); 754 g_free(data); 755 } 756 757 static int virtio_blk_handle_zone_append(VirtIOBlockReq *req, 758 struct iovec *out_iov, 759 struct iovec *in_iov, 760 uint64_t out_num, 761 unsigned in_num) { 762 VirtIOBlock *s = req->dev; 763 VirtIODevice *vdev = VIRTIO_DEVICE(s); 764 uint8_t err_status = VIRTIO_BLK_S_OK; 765 766 int64_t offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS; 767 int64_t len = iov_size(out_iov, out_num); 768 ZoneCmdData *data; 769 770 trace_virtio_blk_handle_zone_append(vdev, req, offset >> BDRV_SECTOR_BITS); 771 if (!check_zoned_request(s, offset, len, true, &err_status)) { 772 goto out; 773 } 774 775 data = g_malloc(sizeof(ZoneCmdData)); 776 data->req = req; 777 data->in_iov = in_iov; 778 data->in_num = in_num; 779 data->zone_append_data.offset = offset; 780 qemu_iovec_init_external(&req->qiov, out_iov, out_num); 781 782 block_acct_start(blk_get_stats(s->blk), &req->acct, len, 783 BLOCK_ACCT_ZONE_APPEND); 784 785 blk_aio_zone_append(s->blk, &data->zone_append_data.offset, &req->qiov, 0, 786 virtio_blk_zone_append_complete, data); 787 return 0; 788 789 out: 790 virtio_blk_req_complete(req, err_status); 791 virtio_blk_free_request(req); 792 return err_status; 793 } 794 795 static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) 796 { 797 uint32_t type; 798 struct iovec *in_iov = req->elem.in_sg; 799 struct iovec *out_iov = req->elem.out_sg; 800 unsigned in_num = req->elem.in_num; 801 unsigned out_num = req->elem.out_num; 802 VirtIOBlock *s = req->dev; 803 VirtIODevice *vdev = VIRTIO_DEVICE(s); 804 805 if (req->elem.out_num < 1 || req->elem.in_num < 1) { 806 virtio_error(vdev, "virtio-blk missing headers"); 807 return -1; 808 } 809 810 if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out, 811 sizeof(req->out)) != sizeof(req->out))) { 812 virtio_error(vdev, "virtio-blk request outhdr too short"); 813 return -1; 814 } 815 816 iov_discard_front_undoable(&out_iov, &out_num, sizeof(req->out), 817 &req->outhdr_undo); 818 819 if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) { 820 virtio_error(vdev, "virtio-blk request inhdr too short"); 821 iov_discard_undo(&req->outhdr_undo); 822 return -1; 823 } 824 825 /* We always touch the last byte, so just see how big in_iov is. */ 826 req->in_len = iov_size(in_iov, in_num); 827 req->in = (void *)in_iov[in_num - 1].iov_base 828 + in_iov[in_num - 1].iov_len 829 - sizeof(struct virtio_blk_inhdr); 830 iov_discard_back_undoable(in_iov, &in_num, sizeof(struct virtio_blk_inhdr), 831 &req->inhdr_undo); 832 833 type = virtio_ldl_p(vdev, &req->out.type); 834 835 /* VIRTIO_BLK_T_OUT defines the command direction. VIRTIO_BLK_T_BARRIER 836 * is an optional flag. Although a guest should not send this flag if 837 * not negotiated we ignored it in the past. So keep ignoring it. */ 838 switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) { 839 case VIRTIO_BLK_T_IN: 840 { 841 bool is_write = type & VIRTIO_BLK_T_OUT; 842 req->sector_num = virtio_ldq_p(vdev, &req->out.sector); 843 844 if (is_write) { 845 qemu_iovec_init_external(&req->qiov, out_iov, out_num); 846 trace_virtio_blk_handle_write(vdev, req, req->sector_num, 847 req->qiov.size / BDRV_SECTOR_SIZE); 848 } else { 849 qemu_iovec_init_external(&req->qiov, in_iov, in_num); 850 trace_virtio_blk_handle_read(vdev, req, req->sector_num, 851 req->qiov.size / BDRV_SECTOR_SIZE); 852 } 853 854 if (!virtio_blk_sect_range_ok(s, req->sector_num, req->qiov.size)) { 855 virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); 856 block_acct_invalid(blk_get_stats(s->blk), 857 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); 858 virtio_blk_free_request(req); 859 return 0; 860 } 861 862 block_acct_start(blk_get_stats(s->blk), &req->acct, req->qiov.size, 863 is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); 864 865 /* merge would exceed maximum number of requests or IO direction 866 * changes */ 867 if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS || 868 is_write != mrb->is_write || 869 !s->conf.request_merging)) { 870 virtio_blk_submit_multireq(s, mrb); 871 } 872 873 assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS); 874 mrb->reqs[mrb->num_reqs++] = req; 875 mrb->is_write = is_write; 876 break; 877 } 878 case VIRTIO_BLK_T_FLUSH: 879 virtio_blk_handle_flush(req, mrb); 880 break; 881 case VIRTIO_BLK_T_ZONE_REPORT: 882 virtio_blk_handle_zone_report(req, in_iov, in_num); 883 break; 884 case VIRTIO_BLK_T_ZONE_OPEN: 885 virtio_blk_handle_zone_mgmt(req, BLK_ZO_OPEN); 886 break; 887 case VIRTIO_BLK_T_ZONE_CLOSE: 888 virtio_blk_handle_zone_mgmt(req, BLK_ZO_CLOSE); 889 break; 890 case VIRTIO_BLK_T_ZONE_FINISH: 891 virtio_blk_handle_zone_mgmt(req, BLK_ZO_FINISH); 892 break; 893 case VIRTIO_BLK_T_ZONE_RESET: 894 virtio_blk_handle_zone_mgmt(req, BLK_ZO_RESET); 895 break; 896 case VIRTIO_BLK_T_ZONE_RESET_ALL: 897 virtio_blk_handle_zone_mgmt(req, BLK_ZO_RESET); 898 break; 899 case VIRTIO_BLK_T_SCSI_CMD: 900 virtio_blk_handle_scsi(req); 901 break; 902 case VIRTIO_BLK_T_GET_ID: 903 { 904 /* 905 * NB: per existing s/n string convention the string is 906 * terminated by '\0' only when shorter than buffer. 907 */ 908 const char *serial = s->conf.serial ? s->conf.serial : ""; 909 size_t size = MIN(strlen(serial) + 1, 910 MIN(iov_size(in_iov, in_num), 911 VIRTIO_BLK_ID_BYTES)); 912 iov_from_buf(in_iov, in_num, 0, serial, size); 913 virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); 914 virtio_blk_free_request(req); 915 break; 916 } 917 case VIRTIO_BLK_T_ZONE_APPEND & ~VIRTIO_BLK_T_OUT: 918 /* 919 * Passing out_iov/out_num and in_iov/in_num is not safe 920 * to access req->elem.out_sg directly because it may be 921 * modified by virtio_blk_handle_request(). 922 */ 923 virtio_blk_handle_zone_append(req, out_iov, in_iov, out_num, in_num); 924 break; 925 /* 926 * VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES are defined with 927 * VIRTIO_BLK_T_OUT flag set. We masked this flag in the switch statement, 928 * so we must mask it for these requests, then we will check if it is set. 929 */ 930 case VIRTIO_BLK_T_DISCARD & ~VIRTIO_BLK_T_OUT: 931 case VIRTIO_BLK_T_WRITE_ZEROES & ~VIRTIO_BLK_T_OUT: 932 { 933 struct virtio_blk_discard_write_zeroes dwz_hdr; 934 size_t out_len = iov_size(out_iov, out_num); 935 bool is_write_zeroes = (type & ~VIRTIO_BLK_T_BARRIER) == 936 VIRTIO_BLK_T_WRITE_ZEROES; 937 uint8_t err_status; 938 939 /* 940 * Unsupported if VIRTIO_BLK_T_OUT is not set or the request contains 941 * more than one segment. 942 */ 943 if (unlikely(!(type & VIRTIO_BLK_T_OUT) || 944 out_len > sizeof(dwz_hdr))) { 945 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); 946 virtio_blk_free_request(req); 947 return 0; 948 } 949 950 if (unlikely(iov_to_buf(out_iov, out_num, 0, &dwz_hdr, 951 sizeof(dwz_hdr)) != sizeof(dwz_hdr))) { 952 iov_discard_undo(&req->inhdr_undo); 953 iov_discard_undo(&req->outhdr_undo); 954 virtio_error(vdev, "virtio-blk discard/write_zeroes header" 955 " too short"); 956 return -1; 957 } 958 959 err_status = virtio_blk_handle_discard_write_zeroes(req, &dwz_hdr, 960 is_write_zeroes); 961 if (err_status != VIRTIO_BLK_S_OK) { 962 virtio_blk_req_complete(req, err_status); 963 virtio_blk_free_request(req); 964 } 965 966 break; 967 } 968 default: 969 virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); 970 virtio_blk_free_request(req); 971 } 972 return 0; 973 } 974 975 void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq) 976 { 977 VirtIOBlockReq *req; 978 MultiReqBuffer mrb = {}; 979 bool suppress_notifications = virtio_queue_get_notification(vq); 980 981 defer_call_begin(); 982 983 do { 984 if (suppress_notifications) { 985 virtio_queue_set_notification(vq, 0); 986 } 987 988 while ((req = virtio_blk_get_request(s, vq))) { 989 if (virtio_blk_handle_request(req, &mrb)) { 990 virtqueue_detach_element(req->vq, &req->elem, 0); 991 virtio_blk_free_request(req); 992 break; 993 } 994 } 995 996 if (suppress_notifications) { 997 virtio_queue_set_notification(vq, 1); 998 } 999 } while (!virtio_queue_empty(vq)); 1000 1001 if (mrb.num_reqs) { 1002 virtio_blk_submit_multireq(s, &mrb); 1003 } 1004 1005 defer_call_end(); 1006 } 1007 1008 static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) 1009 { 1010 VirtIOBlock *s = (VirtIOBlock *)vdev; 1011 1012 if (!s->ioeventfd_disabled && !s->ioeventfd_started) { 1013 /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start 1014 * ioeventfd here instead of waiting for .set_status(). 1015 */ 1016 virtio_device_start_ioeventfd(vdev); 1017 if (!s->ioeventfd_disabled) { 1018 return; 1019 } 1020 } 1021 1022 virtio_blk_handle_vq(s, vq); 1023 } 1024 1025 static void virtio_blk_dma_restart_bh(void *opaque) 1026 { 1027 VirtIOBlockReq *req = opaque; 1028 VirtIOBlock *s = req->dev; /* we're called with at least one request */ 1029 1030 MultiReqBuffer mrb = {}; 1031 1032 while (req) { 1033 VirtIOBlockReq *next = req->next; 1034 if (virtio_blk_handle_request(req, &mrb)) { 1035 /* Device is now broken and won't do any processing until it gets 1036 * reset. Already queued requests will be lost: let's purge them. 1037 */ 1038 while (req) { 1039 next = req->next; 1040 virtqueue_detach_element(req->vq, &req->elem, 0); 1041 virtio_blk_free_request(req); 1042 req = next; 1043 } 1044 break; 1045 } 1046 req = next; 1047 } 1048 1049 if (mrb.num_reqs) { 1050 virtio_blk_submit_multireq(s, &mrb); 1051 } 1052 1053 /* Paired with inc in virtio_blk_dma_restart_cb() */ 1054 blk_dec_in_flight(s->conf.conf.blk); 1055 } 1056 1057 static void virtio_blk_dma_restart_cb(void *opaque, bool running, 1058 RunState state) 1059 { 1060 VirtIOBlock *s = opaque; 1061 uint16_t num_queues = s->conf.num_queues; 1062 g_autofree VirtIOBlockReq **vq_rq = NULL; 1063 VirtIOBlockReq *rq; 1064 1065 if (!running) { 1066 return; 1067 } 1068 1069 /* Split the device-wide s->rq request list into per-vq request lists */ 1070 vq_rq = g_new0(VirtIOBlockReq *, num_queues); 1071 1072 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 1073 rq = s->rq; 1074 s->rq = NULL; 1075 } 1076 1077 while (rq) { 1078 VirtIOBlockReq *next = rq->next; 1079 uint16_t idx = virtio_get_queue_index(rq->vq); 1080 1081 /* Only num_queues vqs were created so vq_rq[idx] is within bounds */ 1082 assert(idx < num_queues); 1083 rq->next = vq_rq[idx]; 1084 vq_rq[idx] = rq; 1085 rq = next; 1086 } 1087 1088 /* Schedule a BH to submit the requests in each vq's AioContext */ 1089 for (uint16_t i = 0; i < num_queues; i++) { 1090 if (!vq_rq[i]) { 1091 continue; 1092 } 1093 1094 /* Paired with dec in virtio_blk_dma_restart_bh() */ 1095 blk_inc_in_flight(s->conf.conf.blk); 1096 1097 aio_bh_schedule_oneshot(s->vq_aio_context[i], 1098 virtio_blk_dma_restart_bh, 1099 vq_rq[i]); 1100 } 1101 } 1102 1103 static void virtio_blk_reset(VirtIODevice *vdev) 1104 { 1105 VirtIOBlock *s = VIRTIO_BLK(vdev); 1106 VirtIOBlockReq *req; 1107 1108 /* Dataplane has stopped... */ 1109 assert(!s->ioeventfd_started); 1110 1111 /* ...but requests may still be in flight. */ 1112 blk_drain(s->blk); 1113 1114 /* We drop queued requests after blk_drain() because blk_drain() itself can 1115 * produce them. */ 1116 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 1117 while (s->rq) { 1118 req = s->rq; 1119 s->rq = req->next; 1120 1121 /* No other threads can access req->vq here */ 1122 virtqueue_detach_element(req->vq, &req->elem, 0); 1123 1124 virtio_blk_free_request(req); 1125 } 1126 } 1127 1128 blk_set_enable_write_cache(s->blk, s->original_wce); 1129 } 1130 1131 /* coalesce internal state, copy to pci i/o region 0 1132 */ 1133 static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) 1134 { 1135 VirtIOBlock *s = VIRTIO_BLK(vdev); 1136 BlockConf *conf = &s->conf.conf; 1137 BlockDriverState *bs = blk_bs(s->blk); 1138 struct virtio_blk_config blkcfg; 1139 uint64_t capacity; 1140 int64_t length; 1141 int blk_size = conf->logical_block_size; 1142 1143 blk_get_geometry(s->blk, &capacity); 1144 memset(&blkcfg, 0, sizeof(blkcfg)); 1145 virtio_stq_p(vdev, &blkcfg.capacity, capacity); 1146 virtio_stl_p(vdev, &blkcfg.seg_max, 1147 s->conf.seg_max_adjust ? s->conf.queue_size - 2 : 128 - 2); 1148 virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls); 1149 virtio_stl_p(vdev, &blkcfg.blk_size, blk_size); 1150 virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size); 1151 virtio_stl_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size); 1152 blkcfg.geometry.heads = conf->heads; 1153 /* 1154 * We must ensure that the block device capacity is a multiple of 1155 * the logical block size. If that is not the case, let's use 1156 * sector_mask to adopt the geometry to have a correct picture. 1157 * For those devices where the capacity is ok for the given geometry 1158 * we don't touch the sector value of the geometry, since some devices 1159 * (like s390 dasd) need a specific value. Here the capacity is already 1160 * cyls*heads*secs*blk_size and the sector value is not block size 1161 * divided by 512 - instead it is the amount of blk_size blocks 1162 * per track (cylinder). 1163 */ 1164 length = blk_getlength(s->blk); 1165 if (length > 0 && length / conf->heads / conf->secs % blk_size) { 1166 blkcfg.geometry.sectors = conf->secs & ~s->sector_mask; 1167 } else { 1168 blkcfg.geometry.sectors = conf->secs; 1169 } 1170 blkcfg.size_max = 0; 1171 blkcfg.physical_block_exp = get_physical_block_exp(conf); 1172 blkcfg.alignment_offset = 0; 1173 blkcfg.wce = blk_enable_write_cache(s->blk); 1174 virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues); 1175 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD)) { 1176 uint32_t discard_granularity = conf->discard_granularity; 1177 if (discard_granularity == -1 || !s->conf.report_discard_granularity) { 1178 discard_granularity = blk_size; 1179 } 1180 virtio_stl_p(vdev, &blkcfg.max_discard_sectors, 1181 s->conf.max_discard_sectors); 1182 virtio_stl_p(vdev, &blkcfg.discard_sector_alignment, 1183 discard_granularity >> BDRV_SECTOR_BITS); 1184 /* 1185 * We support only one segment per request since multiple segments 1186 * are not widely used and there are no userspace APIs that allow 1187 * applications to submit multiple segments in a single call. 1188 */ 1189 virtio_stl_p(vdev, &blkcfg.max_discard_seg, 1); 1190 } 1191 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES)) { 1192 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_sectors, 1193 s->conf.max_write_zeroes_sectors); 1194 blkcfg.write_zeroes_may_unmap = 1; 1195 virtio_stl_p(vdev, &blkcfg.max_write_zeroes_seg, 1); 1196 } 1197 if (bs->bl.zoned != BLK_Z_NONE) { 1198 switch (bs->bl.zoned) { 1199 case BLK_Z_HM: 1200 blkcfg.zoned.model = VIRTIO_BLK_Z_HM; 1201 break; 1202 case BLK_Z_HA: 1203 blkcfg.zoned.model = VIRTIO_BLK_Z_HA; 1204 break; 1205 default: 1206 g_assert_not_reached(); 1207 } 1208 1209 virtio_stl_p(vdev, &blkcfg.zoned.zone_sectors, 1210 bs->bl.zone_size / 512); 1211 virtio_stl_p(vdev, &blkcfg.zoned.max_active_zones, 1212 bs->bl.max_active_zones); 1213 virtio_stl_p(vdev, &blkcfg.zoned.max_open_zones, 1214 bs->bl.max_open_zones); 1215 virtio_stl_p(vdev, &blkcfg.zoned.write_granularity, blk_size); 1216 virtio_stl_p(vdev, &blkcfg.zoned.max_append_sectors, 1217 bs->bl.max_append_sectors); 1218 } else { 1219 blkcfg.zoned.model = VIRTIO_BLK_Z_NONE; 1220 } 1221 memcpy(config, &blkcfg, s->config_size); 1222 } 1223 1224 static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config) 1225 { 1226 VirtIOBlock *s = VIRTIO_BLK(vdev); 1227 struct virtio_blk_config blkcfg; 1228 1229 memcpy(&blkcfg, config, s->config_size); 1230 1231 blk_set_enable_write_cache(s->blk, blkcfg.wce != 0); 1232 } 1233 1234 static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features, 1235 Error **errp) 1236 { 1237 VirtIOBlock *s = VIRTIO_BLK(vdev); 1238 1239 /* Firstly sync all virtio-blk possible supported features */ 1240 features |= s->host_features; 1241 1242 virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX); 1243 virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY); 1244 virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY); 1245 virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE); 1246 if (!virtio_has_feature(features, VIRTIO_F_VERSION_1)) { 1247 virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT); 1248 /* Added for historical reasons, removing it could break migration. */ 1249 virtio_add_feature(&features, VIRTIO_BLK_F_SCSI); 1250 } 1251 1252 if (blk_enable_write_cache(s->blk) || 1253 (s->conf.x_enable_wce_if_config_wce && 1254 virtio_has_feature(features, VIRTIO_BLK_F_CONFIG_WCE))) { 1255 virtio_add_feature(&features, VIRTIO_BLK_F_WCE); 1256 } 1257 if (!blk_is_writable(s->blk)) { 1258 virtio_add_feature(&features, VIRTIO_BLK_F_RO); 1259 } 1260 if (s->conf.num_queues > 1) { 1261 virtio_add_feature(&features, VIRTIO_BLK_F_MQ); 1262 } 1263 1264 return features; 1265 } 1266 1267 static void virtio_blk_set_status(VirtIODevice *vdev, uint8_t status) 1268 { 1269 VirtIOBlock *s = VIRTIO_BLK(vdev); 1270 1271 if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) { 1272 assert(!s->ioeventfd_started); 1273 } 1274 1275 if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { 1276 return; 1277 } 1278 1279 /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send 1280 * cache flushes. Thus, the "auto writethrough" behavior is never 1281 * necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature. 1282 * Leaving it enabled would break the following sequence: 1283 * 1284 * Guest started with "-drive cache=writethrough" 1285 * Guest sets status to 0 1286 * Guest sets DRIVER bit in status field 1287 * Guest reads host features (WCE=0, CONFIG_WCE=1) 1288 * Guest writes guest features (WCE=0, CONFIG_WCE=1) 1289 * Guest writes 1 to the WCE configuration field (writeback mode) 1290 * Guest sets DRIVER_OK bit in status field 1291 * 1292 * s->blk would erroneously be placed in writethrough mode. 1293 */ 1294 if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) { 1295 blk_set_enable_write_cache(s->blk, 1296 virtio_vdev_has_feature(vdev, 1297 VIRTIO_BLK_F_WCE)); 1298 } 1299 } 1300 1301 static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f) 1302 { 1303 VirtIOBlock *s = VIRTIO_BLK(vdev); 1304 1305 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 1306 VirtIOBlockReq *req = s->rq; 1307 1308 while (req) { 1309 qemu_put_sbyte(f, 1); 1310 1311 if (s->conf.num_queues > 1) { 1312 qemu_put_be32(f, virtio_get_queue_index(req->vq)); 1313 } 1314 1315 qemu_put_virtqueue_element(vdev, f, &req->elem); 1316 req = req->next; 1317 } 1318 } 1319 1320 qemu_put_sbyte(f, 0); 1321 } 1322 1323 static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f, 1324 int version_id) 1325 { 1326 VirtIOBlock *s = VIRTIO_BLK(vdev); 1327 1328 while (qemu_get_sbyte(f)) { 1329 unsigned nvqs = s->conf.num_queues; 1330 unsigned vq_idx = 0; 1331 VirtIOBlockReq *req; 1332 1333 if (nvqs > 1) { 1334 vq_idx = qemu_get_be32(f); 1335 1336 if (vq_idx >= nvqs) { 1337 error_report("Invalid virtqueue index in request list: %#x", 1338 vq_idx); 1339 return -EINVAL; 1340 } 1341 } 1342 1343 req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq)); 1344 virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req); 1345 1346 WITH_QEMU_LOCK_GUARD(&s->rq_lock) { 1347 req->next = s->rq; 1348 s->rq = req; 1349 } 1350 } 1351 1352 return 0; 1353 } 1354 1355 static void virtio_resize_cb(void *opaque) 1356 { 1357 VirtIODevice *vdev = opaque; 1358 1359 assert(qemu_get_current_aio_context() == qemu_get_aio_context()); 1360 virtio_notify_config(vdev); 1361 } 1362 1363 static void virtio_blk_resize(void *opaque) 1364 { 1365 VirtIODevice *vdev = VIRTIO_DEVICE(opaque); 1366 1367 /* 1368 * virtio_notify_config() needs to acquire the BQL, 1369 * so it can't be called from an iothread. Instead, schedule 1370 * it to be run in the main context BH. 1371 */ 1372 aio_bh_schedule_oneshot(qemu_get_aio_context(), virtio_resize_cb, vdev); 1373 } 1374 1375 static void virtio_blk_ioeventfd_detach(VirtIOBlock *s) 1376 { 1377 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1378 1379 for (uint16_t i = 0; i < s->conf.num_queues; i++) { 1380 VirtQueue *vq = virtio_get_queue(vdev, i); 1381 virtio_queue_aio_detach_host_notifier(vq, s->vq_aio_context[i]); 1382 } 1383 } 1384 1385 static void virtio_blk_ioeventfd_attach(VirtIOBlock *s) 1386 { 1387 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1388 1389 for (uint16_t i = 0; i < s->conf.num_queues; i++) { 1390 VirtQueue *vq = virtio_get_queue(vdev, i); 1391 virtio_queue_aio_attach_host_notifier(vq, s->vq_aio_context[i]); 1392 } 1393 } 1394 1395 /* Suspend virtqueue ioeventfd processing during drain */ 1396 static void virtio_blk_drained_begin(void *opaque) 1397 { 1398 VirtIOBlock *s = opaque; 1399 1400 if (s->ioeventfd_started) { 1401 virtio_blk_ioeventfd_detach(s); 1402 } 1403 } 1404 1405 /* Resume virtqueue ioeventfd processing after drain */ 1406 static void virtio_blk_drained_end(void *opaque) 1407 { 1408 VirtIOBlock *s = opaque; 1409 1410 if (s->ioeventfd_started) { 1411 virtio_blk_ioeventfd_attach(s); 1412 } 1413 } 1414 1415 static const BlockDevOps virtio_block_ops = { 1416 .resize_cb = virtio_blk_resize, 1417 .drained_begin = virtio_blk_drained_begin, 1418 .drained_end = virtio_blk_drained_end, 1419 }; 1420 1421 static bool 1422 validate_iothread_vq_mapping_list(IOThreadVirtQueueMappingList *list, 1423 uint16_t num_queues, Error **errp) 1424 { 1425 g_autofree unsigned long *vqs = bitmap_new(num_queues); 1426 g_autoptr(GHashTable) iothreads = 1427 g_hash_table_new(g_str_hash, g_str_equal); 1428 1429 for (IOThreadVirtQueueMappingList *node = list; node; node = node->next) { 1430 const char *name = node->value->iothread; 1431 uint16List *vq; 1432 1433 if (!iothread_by_id(name)) { 1434 error_setg(errp, "IOThread \"%s\" object does not exist", name); 1435 return false; 1436 } 1437 1438 if (!g_hash_table_add(iothreads, (gpointer)name)) { 1439 error_setg(errp, 1440 "duplicate IOThread name \"%s\" in iothread-vq-mapping", 1441 name); 1442 return false; 1443 } 1444 1445 if (node != list) { 1446 if (!!node->value->vqs != !!list->value->vqs) { 1447 error_setg(errp, "either all items in iothread-vq-mapping " 1448 "must have vqs or none of them must have it"); 1449 return false; 1450 } 1451 } 1452 1453 for (vq = node->value->vqs; vq; vq = vq->next) { 1454 if (vq->value >= num_queues) { 1455 error_setg(errp, "vq index %u for IOThread \"%s\" must be " 1456 "less than num_queues %u in iothread-vq-mapping", 1457 vq->value, name, num_queues); 1458 return false; 1459 } 1460 1461 if (test_and_set_bit(vq->value, vqs)) { 1462 error_setg(errp, "cannot assign vq %u to IOThread \"%s\" " 1463 "because it is already assigned", vq->value, name); 1464 return false; 1465 } 1466 } 1467 } 1468 1469 if (list->value->vqs) { 1470 for (uint16_t i = 0; i < num_queues; i++) { 1471 if (!test_bit(i, vqs)) { 1472 error_setg(errp, 1473 "missing vq %u IOThread assignment in iothread-vq-mapping", 1474 i); 1475 return false; 1476 } 1477 } 1478 } 1479 1480 return true; 1481 } 1482 1483 /** 1484 * apply_iothread_vq_mapping: 1485 * @iothread_vq_mapping_list: The mapping of virtqueues to IOThreads. 1486 * @vq_aio_context: The array of AioContext pointers to fill in. 1487 * @num_queues: The length of @vq_aio_context. 1488 * @errp: If an error occurs, a pointer to the area to store the error. 1489 * 1490 * Fill in the AioContext for each virtqueue in the @vq_aio_context array given 1491 * the iothread-vq-mapping parameter in @iothread_vq_mapping_list. 1492 * 1493 * Returns: %true on success, %false on failure. 1494 **/ 1495 static bool apply_iothread_vq_mapping( 1496 IOThreadVirtQueueMappingList *iothread_vq_mapping_list, 1497 AioContext **vq_aio_context, 1498 uint16_t num_queues, 1499 Error **errp) 1500 { 1501 IOThreadVirtQueueMappingList *node; 1502 size_t num_iothreads = 0; 1503 size_t cur_iothread = 0; 1504 1505 if (!validate_iothread_vq_mapping_list(iothread_vq_mapping_list, 1506 num_queues, errp)) { 1507 return false; 1508 } 1509 1510 for (node = iothread_vq_mapping_list; node; node = node->next) { 1511 num_iothreads++; 1512 } 1513 1514 for (node = iothread_vq_mapping_list; node; node = node->next) { 1515 IOThread *iothread = iothread_by_id(node->value->iothread); 1516 AioContext *ctx = iothread_get_aio_context(iothread); 1517 1518 /* Released in virtio_blk_vq_aio_context_cleanup() */ 1519 object_ref(OBJECT(iothread)); 1520 1521 if (node->value->vqs) { 1522 uint16List *vq; 1523 1524 /* Explicit vq:IOThread assignment */ 1525 for (vq = node->value->vqs; vq; vq = vq->next) { 1526 assert(vq->value < num_queues); 1527 vq_aio_context[vq->value] = ctx; 1528 } 1529 } else { 1530 /* Round-robin vq:IOThread assignment */ 1531 for (unsigned i = cur_iothread; i < num_queues; 1532 i += num_iothreads) { 1533 vq_aio_context[i] = ctx; 1534 } 1535 } 1536 1537 cur_iothread++; 1538 } 1539 1540 return true; 1541 } 1542 1543 /* Context: BQL held */ 1544 static bool virtio_blk_vq_aio_context_init(VirtIOBlock *s, Error **errp) 1545 { 1546 ERRP_GUARD(); 1547 VirtIODevice *vdev = VIRTIO_DEVICE(s); 1548 VirtIOBlkConf *conf = &s->conf; 1549 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); 1550 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 1551 1552 if (conf->iothread && conf->iothread_vq_mapping_list) { 1553 error_setg(errp, 1554 "iothread and iothread-vq-mapping properties cannot be set " 1555 "at the same time"); 1556 return false; 1557 } 1558 1559 if (conf->iothread || conf->iothread_vq_mapping_list) { 1560 if (!k->set_guest_notifiers || !k->ioeventfd_assign) { 1561 error_setg(errp, 1562 "device is incompatible with iothread " 1563 "(transport does not support notifiers)"); 1564 return false; 1565 } 1566 if (!virtio_device_ioeventfd_enabled(vdev)) { 1567 error_setg(errp, "ioeventfd is required for iothread"); 1568 return false; 1569 } 1570 1571 /* 1572 * If ioeventfd is (re-)enabled while the guest is running there could 1573 * be block jobs that can conflict. 1574 */ 1575 if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { 1576 error_prepend(errp, "cannot start virtio-blk ioeventfd: "); 1577 return false; 1578 } 1579 } 1580 1581 s->vq_aio_context = g_new(AioContext *, conf->num_queues); 1582 1583 if (conf->iothread_vq_mapping_list) { 1584 if (!apply_iothread_vq_mapping(conf->iothread_vq_mapping_list, 1585 s->vq_aio_context, 1586 conf->num_queues, 1587 errp)) { 1588 g_free(s->vq_aio_context); 1589 s->vq_aio_context = NULL; 1590 return false; 1591 } 1592 } else if (conf->iothread) { 1593 AioContext *ctx = iothread_get_aio_context(conf->iothread); 1594 for (unsigned i = 0; i < conf->num_queues; i++) { 1595 s->vq_aio_context[i] = ctx; 1596 } 1597 1598 /* Released in virtio_blk_vq_aio_context_cleanup() */ 1599 object_ref(OBJECT(conf->iothread)); 1600 } else { 1601 AioContext *ctx = qemu_get_aio_context(); 1602 for (unsigned i = 0; i < conf->num_queues; i++) { 1603 s->vq_aio_context[i] = ctx; 1604 } 1605 } 1606 1607 return true; 1608 } 1609 1610 /* Context: BQL held */ 1611 static void virtio_blk_vq_aio_context_cleanup(VirtIOBlock *s) 1612 { 1613 VirtIOBlkConf *conf = &s->conf; 1614 1615 assert(!s->ioeventfd_started); 1616 1617 if (conf->iothread_vq_mapping_list) { 1618 IOThreadVirtQueueMappingList *node; 1619 1620 for (node = conf->iothread_vq_mapping_list; node; node = node->next) { 1621 IOThread *iothread = iothread_by_id(node->value->iothread); 1622 object_unref(OBJECT(iothread)); 1623 } 1624 } 1625 1626 if (conf->iothread) { 1627 object_unref(OBJECT(conf->iothread)); 1628 } 1629 1630 g_free(s->vq_aio_context); 1631 s->vq_aio_context = NULL; 1632 } 1633 1634 /* Context: BQL held */ 1635 static int virtio_blk_start_ioeventfd(VirtIODevice *vdev) 1636 { 1637 VirtIOBlock *s = VIRTIO_BLK(vdev); 1638 BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s))); 1639 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 1640 unsigned i; 1641 unsigned nvqs = s->conf.num_queues; 1642 Error *local_err = NULL; 1643 int r; 1644 1645 if (s->ioeventfd_started || s->ioeventfd_starting) { 1646 return 0; 1647 } 1648 1649 s->ioeventfd_starting = true; 1650 1651 /* Set up guest notifier (irq) */ 1652 r = k->set_guest_notifiers(qbus->parent, nvqs, true); 1653 if (r != 0) { 1654 error_report("virtio-blk failed to set guest notifier (%d), " 1655 "ensure -accel kvm is set.", r); 1656 goto fail_guest_notifiers; 1657 } 1658 1659 /* 1660 * Batch all the host notifiers in a single transaction to avoid 1661 * quadratic time complexity in address_space_update_ioeventfds(). 1662 */ 1663 memory_region_transaction_begin(); 1664 1665 /* Set up virtqueue notify */ 1666 for (i = 0; i < nvqs; i++) { 1667 r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, true); 1668 if (r != 0) { 1669 int j = i; 1670 1671 fprintf(stderr, "virtio-blk failed to set host notifier (%d)\n", r); 1672 while (i--) { 1673 virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false); 1674 } 1675 1676 /* 1677 * The transaction expects the ioeventfds to be open when it 1678 * commits. Do it now, before the cleanup loop. 1679 */ 1680 memory_region_transaction_commit(); 1681 1682 while (j--) { 1683 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), j); 1684 } 1685 goto fail_host_notifiers; 1686 } 1687 } 1688 1689 memory_region_transaction_commit(); 1690 1691 /* 1692 * Try to change the AioContext so that block jobs and other operations can 1693 * co-locate their activity in the same AioContext. If it fails, nevermind. 1694 */ 1695 assert(nvqs > 0); /* enforced during ->realize() */ 1696 r = blk_set_aio_context(s->conf.conf.blk, s->vq_aio_context[0], 1697 &local_err); 1698 if (r < 0) { 1699 warn_report_err(local_err); 1700 } 1701 1702 /* 1703 * These fields must be visible to the IOThread when it processes the 1704 * virtqueue, otherwise it will think ioeventfd has not started yet. 1705 * 1706 * Make sure ->ioeventfd_started is false when blk_set_aio_context() is 1707 * called above so that draining does not cause the host notifier to be 1708 * detached/attached prematurely. 1709 */ 1710 s->ioeventfd_starting = false; 1711 s->ioeventfd_started = true; 1712 smp_wmb(); /* paired with aio_notify_accept() on the read side */ 1713 1714 /* 1715 * Get this show started by hooking up our callbacks. If drained now, 1716 * virtio_blk_drained_end() will do this later. 1717 * Attaching the notifier also kicks the virtqueues, processing any requests 1718 * they may already have. 1719 */ 1720 if (!blk_in_drain(s->conf.conf.blk)) { 1721 virtio_blk_ioeventfd_attach(s); 1722 } 1723 return 0; 1724 1725 fail_host_notifiers: 1726 k->set_guest_notifiers(qbus->parent, nvqs, false); 1727 fail_guest_notifiers: 1728 s->ioeventfd_disabled = true; 1729 s->ioeventfd_starting = false; 1730 return -ENOSYS; 1731 } 1732 1733 /* Stop notifications for new requests from guest. 1734 * 1735 * Context: BH in IOThread 1736 */ 1737 static void virtio_blk_ioeventfd_stop_vq_bh(void *opaque) 1738 { 1739 VirtQueue *vq = opaque; 1740 EventNotifier *host_notifier = virtio_queue_get_host_notifier(vq); 1741 1742 virtio_queue_aio_detach_host_notifier(vq, qemu_get_current_aio_context()); 1743 1744 /* 1745 * Test and clear notifier after disabling event, in case poll callback 1746 * didn't have time to run. 1747 */ 1748 virtio_queue_host_notifier_read(host_notifier); 1749 } 1750 1751 /* Context: BQL held */ 1752 static void virtio_blk_stop_ioeventfd(VirtIODevice *vdev) 1753 { 1754 VirtIOBlock *s = VIRTIO_BLK(vdev); 1755 BusState *qbus = qdev_get_parent_bus(DEVICE(s)); 1756 VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); 1757 unsigned i; 1758 unsigned nvqs = s->conf.num_queues; 1759 1760 if (!s->ioeventfd_started || s->ioeventfd_stopping) { 1761 return; 1762 } 1763 1764 /* Better luck next time. */ 1765 if (s->ioeventfd_disabled) { 1766 s->ioeventfd_disabled = false; 1767 s->ioeventfd_started = false; 1768 return; 1769 } 1770 s->ioeventfd_stopping = true; 1771 1772 if (!blk_in_drain(s->conf.conf.blk)) { 1773 for (i = 0; i < nvqs; i++) { 1774 VirtQueue *vq = virtio_get_queue(vdev, i); 1775 AioContext *ctx = s->vq_aio_context[i]; 1776 1777 aio_wait_bh_oneshot(ctx, virtio_blk_ioeventfd_stop_vq_bh, vq); 1778 } 1779 } 1780 1781 /* 1782 * Batch all the host notifiers in a single transaction to avoid 1783 * quadratic time complexity in address_space_update_ioeventfds(). 1784 */ 1785 memory_region_transaction_begin(); 1786 1787 for (i = 0; i < nvqs; i++) { 1788 virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false); 1789 } 1790 1791 /* 1792 * The transaction expects the ioeventfds to be open when it 1793 * commits. Do it now, before the cleanup loop. 1794 */ 1795 memory_region_transaction_commit(); 1796 1797 for (i = 0; i < nvqs; i++) { 1798 virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), i); 1799 } 1800 1801 /* 1802 * Set ->ioeventfd_started to false before draining so that host notifiers 1803 * are not detached/attached anymore. 1804 */ 1805 s->ioeventfd_started = false; 1806 1807 /* Wait for virtio_blk_dma_restart_bh() and in flight I/O to complete */ 1808 blk_drain(s->conf.conf.blk); 1809 1810 /* 1811 * Try to switch bs back to the QEMU main loop. If other users keep the 1812 * BlockBackend in the iothread, that's ok 1813 */ 1814 blk_set_aio_context(s->conf.conf.blk, qemu_get_aio_context(), NULL); 1815 1816 /* Clean up guest notifier (irq) */ 1817 k->set_guest_notifiers(qbus->parent, nvqs, false); 1818 1819 s->ioeventfd_stopping = false; 1820 } 1821 1822 static void virtio_blk_device_realize(DeviceState *dev, Error **errp) 1823 { 1824 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1825 VirtIOBlock *s = VIRTIO_BLK(dev); 1826 VirtIOBlkConf *conf = &s->conf; 1827 BlockDriverState *bs; 1828 Error *err = NULL; 1829 unsigned i; 1830 1831 if (!conf->conf.blk) { 1832 error_setg(errp, "drive property not set"); 1833 return; 1834 } 1835 if (!blk_is_inserted(conf->conf.blk)) { 1836 error_setg(errp, "Device needs media, but drive is empty"); 1837 return; 1838 } 1839 if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) { 1840 conf->num_queues = 1; 1841 } 1842 if (!conf->num_queues) { 1843 error_setg(errp, "num-queues property must be larger than 0"); 1844 return; 1845 } 1846 if (conf->queue_size <= 2) { 1847 error_setg(errp, "invalid queue-size property (%" PRIu16 "), " 1848 "must be > 2", conf->queue_size); 1849 return; 1850 } 1851 if (!is_power_of_2(conf->queue_size) || 1852 conf->queue_size > VIRTQUEUE_MAX_SIZE) { 1853 error_setg(errp, "invalid queue-size property (%" PRIu16 "), " 1854 "must be a power of 2 (max %d)", 1855 conf->queue_size, VIRTQUEUE_MAX_SIZE); 1856 return; 1857 } 1858 1859 if (!blkconf_apply_backend_options(&conf->conf, 1860 !blk_supports_write_perm(conf->conf.blk), 1861 true, errp)) { 1862 return; 1863 } 1864 s->original_wce = blk_enable_write_cache(conf->conf.blk); 1865 if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) { 1866 return; 1867 } 1868 1869 if (!blkconf_blocksizes(&conf->conf, errp)) { 1870 return; 1871 } 1872 1873 bs = blk_bs(conf->conf.blk); 1874 if (bs->bl.zoned != BLK_Z_NONE) { 1875 virtio_add_feature(&s->host_features, VIRTIO_BLK_F_ZONED); 1876 if (bs->bl.zoned == BLK_Z_HM) { 1877 virtio_clear_feature(&s->host_features, VIRTIO_BLK_F_DISCARD); 1878 } 1879 } 1880 1881 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD) && 1882 (!conf->max_discard_sectors || 1883 conf->max_discard_sectors > BDRV_REQUEST_MAX_SECTORS)) { 1884 error_setg(errp, "invalid max-discard-sectors property (%" PRIu32 ")" 1885 ", must be between 1 and %d", 1886 conf->max_discard_sectors, (int)BDRV_REQUEST_MAX_SECTORS); 1887 return; 1888 } 1889 1890 if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES) && 1891 (!conf->max_write_zeroes_sectors || 1892 conf->max_write_zeroes_sectors > BDRV_REQUEST_MAX_SECTORS)) { 1893 error_setg(errp, "invalid max-write-zeroes-sectors property (%" PRIu32 1894 "), must be between 1 and %d", 1895 conf->max_write_zeroes_sectors, 1896 (int)BDRV_REQUEST_MAX_SECTORS); 1897 return; 1898 } 1899 1900 s->config_size = virtio_get_config_size(&virtio_blk_cfg_size_params, 1901 s->host_features); 1902 virtio_init(vdev, VIRTIO_ID_BLOCK, s->config_size); 1903 1904 qemu_mutex_init(&s->rq_lock); 1905 1906 s->blk = conf->conf.blk; 1907 s->rq = NULL; 1908 s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1; 1909 1910 for (i = 0; i < conf->num_queues; i++) { 1911 virtio_add_queue(vdev, conf->queue_size, virtio_blk_handle_output); 1912 } 1913 qemu_coroutine_inc_pool_size(conf->num_queues * conf->queue_size / 2); 1914 1915 /* Don't start ioeventfd if transport does not support notifiers. */ 1916 if (!virtio_device_ioeventfd_enabled(vdev)) { 1917 s->ioeventfd_disabled = true; 1918 } 1919 1920 virtio_blk_vq_aio_context_init(s, &err); 1921 if (err != NULL) { 1922 error_propagate(errp, err); 1923 for (i = 0; i < conf->num_queues; i++) { 1924 virtio_del_queue(vdev, i); 1925 } 1926 virtio_cleanup(vdev); 1927 return; 1928 } 1929 1930 /* 1931 * This must be after virtio_init() so virtio_blk_dma_restart_cb() gets 1932 * called after ->start_ioeventfd() has already set blk's AioContext. 1933 */ 1934 s->change = 1935 qdev_add_vm_change_state_handler(dev, virtio_blk_dma_restart_cb, s); 1936 1937 blk_ram_registrar_init(&s->blk_ram_registrar, s->blk); 1938 blk_set_dev_ops(s->blk, &virtio_block_ops, s); 1939 1940 blk_iostatus_enable(s->blk); 1941 1942 add_boot_device_lchs(dev, "/disk@0,0", 1943 conf->conf.lcyls, 1944 conf->conf.lheads, 1945 conf->conf.lsecs); 1946 } 1947 1948 static void virtio_blk_device_unrealize(DeviceState *dev) 1949 { 1950 VirtIODevice *vdev = VIRTIO_DEVICE(dev); 1951 VirtIOBlock *s = VIRTIO_BLK(dev); 1952 VirtIOBlkConf *conf = &s->conf; 1953 unsigned i; 1954 1955 blk_drain(s->blk); 1956 del_boot_device_lchs(dev, "/disk@0,0"); 1957 virtio_blk_vq_aio_context_cleanup(s); 1958 for (i = 0; i < conf->num_queues; i++) { 1959 virtio_del_queue(vdev, i); 1960 } 1961 qemu_coroutine_dec_pool_size(conf->num_queues * conf->queue_size / 2); 1962 qemu_mutex_destroy(&s->rq_lock); 1963 blk_ram_registrar_destroy(&s->blk_ram_registrar); 1964 qemu_del_vm_change_state_handler(s->change); 1965 blockdev_mark_auto_del(s->blk); 1966 virtio_cleanup(vdev); 1967 } 1968 1969 static void virtio_blk_instance_init(Object *obj) 1970 { 1971 VirtIOBlock *s = VIRTIO_BLK(obj); 1972 1973 device_add_bootindex_property(obj, &s->conf.conf.bootindex, 1974 "bootindex", "/disk@0,0", 1975 DEVICE(obj)); 1976 } 1977 1978 static const VMStateDescription vmstate_virtio_blk = { 1979 .name = "virtio-blk", 1980 .minimum_version_id = 2, 1981 .version_id = 2, 1982 .fields = (const VMStateField[]) { 1983 VMSTATE_VIRTIO_DEVICE, 1984 VMSTATE_END_OF_LIST() 1985 }, 1986 }; 1987 1988 static Property virtio_blk_properties[] = { 1989 DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf), 1990 DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf), 1991 DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf), 1992 DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial), 1993 DEFINE_PROP_BIT64("config-wce", VirtIOBlock, host_features, 1994 VIRTIO_BLK_F_CONFIG_WCE, true), 1995 DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0, 1996 true), 1997 DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues, 1998 VIRTIO_BLK_AUTO_NUM_QUEUES), 1999 DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 256), 2000 DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, true), 2001 DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD, 2002 IOThread *), 2003 DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST("iothread-vq-mapping", VirtIOBlock, 2004 conf.iothread_vq_mapping_list), 2005 DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features, 2006 VIRTIO_BLK_F_DISCARD, true), 2007 DEFINE_PROP_BOOL("report-discard-granularity", VirtIOBlock, 2008 conf.report_discard_granularity, true), 2009 DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features, 2010 VIRTIO_BLK_F_WRITE_ZEROES, true), 2011 DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock, 2012 conf.max_discard_sectors, BDRV_REQUEST_MAX_SECTORS), 2013 DEFINE_PROP_UINT32("max-write-zeroes-sectors", VirtIOBlock, 2014 conf.max_write_zeroes_sectors, BDRV_REQUEST_MAX_SECTORS), 2015 DEFINE_PROP_BOOL("x-enable-wce-if-config-wce", VirtIOBlock, 2016 conf.x_enable_wce_if_config_wce, true), 2017 DEFINE_PROP_END_OF_LIST(), 2018 }; 2019 2020 static void virtio_blk_class_init(ObjectClass *klass, void *data) 2021 { 2022 DeviceClass *dc = DEVICE_CLASS(klass); 2023 VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); 2024 2025 device_class_set_props(dc, virtio_blk_properties); 2026 dc->vmsd = &vmstate_virtio_blk; 2027 set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); 2028 vdc->realize = virtio_blk_device_realize; 2029 vdc->unrealize = virtio_blk_device_unrealize; 2030 vdc->get_config = virtio_blk_update_config; 2031 vdc->set_config = virtio_blk_set_config; 2032 vdc->get_features = virtio_blk_get_features; 2033 vdc->set_status = virtio_blk_set_status; 2034 vdc->reset = virtio_blk_reset; 2035 vdc->save = virtio_blk_save_device; 2036 vdc->load = virtio_blk_load_device; 2037 vdc->start_ioeventfd = virtio_blk_start_ioeventfd; 2038 vdc->stop_ioeventfd = virtio_blk_stop_ioeventfd; 2039 } 2040 2041 static const TypeInfo virtio_blk_info = { 2042 .name = TYPE_VIRTIO_BLK, 2043 .parent = TYPE_VIRTIO_DEVICE, 2044 .instance_size = sizeof(VirtIOBlock), 2045 .instance_init = virtio_blk_instance_init, 2046 .class_init = virtio_blk_class_init, 2047 }; 2048 2049 static void virtio_register_types(void) 2050 { 2051 type_register_static(&virtio_blk_info); 2052 } 2053 2054 type_init(virtio_register_types) 2055