| 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/core/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 | /* Internal buffer size limit for zone report */ |
| 42 | #define VIRTIO_BLK_MAX_ZONES_PER_BATCH 4096 |
| 43 | |
| 44 | static void virtio_blk_ioeventfd_attach(VirtIOBlock *s); |
| 45 | |
| 46 | static void virtio_blk_init_request(VirtIOBlock *s, VirtQueue *vq, |
| 47 | VirtIOBlockReq *req) |
| 48 | { |
| 49 | req->dev = s; |
| 50 | req->vq = vq; |
| 51 | req->qiov.size = 0; |
| 52 | req->in_len = 0; |
| 53 | req->next = NULL; |
| 54 | req->mr_next = NULL; |
| 55 | } |
| 56 | |
| 57 | void virtio_blk_req_complete(VirtIOBlockReq *req, unsigned char status) |
| 58 | { |
| 59 | VirtIOBlock *s = req->dev; |
| 60 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 61 | |
| 62 | trace_virtio_blk_req_complete(vdev, req, status); |
| 63 | |
| 64 | stb_p(&req->in->status, status); |
| 65 | iov_discard_undo(&req->inhdr_undo); |
| 66 | iov_discard_undo(&req->outhdr_undo); |
| 67 | virtqueue_push(req->vq, &req->elem, req->in_len); |
| 68 | virtio_notify(vdev, req->vq); |
| 69 | } |
| 70 | |
| 71 | static int virtio_blk_handle_rw_error(VirtIOBlockReq *req, int error, |
| 72 | bool is_read, bool acct_failed) |
| 73 | { |
| 74 | VirtIOBlock *s = req->dev; |
| 75 | BlockErrorAction action = blk_get_error_action(s->blk, is_read, error); |
| 76 | |
| 77 | if (action == BLOCK_ERROR_ACTION_STOP) { |
| 78 | /* Break the link as the next request is going to be parsed from the |
| 79 | * ring again. Otherwise we may end up doing a double completion! */ |
| 80 | req->mr_next = NULL; |
| 81 | |
| 82 | WITH_QEMU_LOCK_GUARD(&s->rq_lock) { |
| 83 | req->next = s->rq; |
| 84 | s->rq = req; |
| 85 | } |
| 86 | } else if (action == BLOCK_ERROR_ACTION_REPORT) { |
| 87 | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
| 88 | if (acct_failed) { |
| 89 | block_acct_failed(blk_get_stats(s->blk), &req->acct); |
| 90 | } |
| 91 | g_free(req); |
| 92 | } |
| 93 | |
| 94 | blk_error_action(s->blk, action, is_read, error); |
| 95 | return action != BLOCK_ERROR_ACTION_IGNORE; |
| 96 | } |
| 97 | |
| 98 | static void virtio_blk_rw_complete(void *opaque, int ret) |
| 99 | { |
| 100 | VirtIOBlockReq *next = opaque; |
| 101 | VirtIOBlock *s = next->dev; |
| 102 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 103 | |
| 104 | while (next) { |
| 105 | VirtIOBlockReq *req = next; |
| 106 | next = req->mr_next; |
| 107 | trace_virtio_blk_rw_complete(vdev, req, ret); |
| 108 | |
| 109 | if (req->qiov.nalloc != -1) { |
| 110 | /* If nalloc is != -1 req->qiov is a local copy of the original |
| 111 | * external iovec. It was allocated in submit_requests to be |
| 112 | * able to merge requests. */ |
| 113 | qemu_iovec_destroy(&req->qiov); |
| 114 | } |
| 115 | |
| 116 | if (ret) { |
| 117 | int p = virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type); |
| 118 | bool is_read = !(p & VIRTIO_BLK_T_OUT); |
| 119 | /* Note that memory may be dirtied on read failure. If the |
| 120 | * virtio request is not completed here, as is the case for |
| 121 | * BLOCK_ERROR_ACTION_STOP, the memory may not be copied |
| 122 | * correctly during live migration. While this is ugly, |
| 123 | * it is acceptable because the device is free to write to |
| 124 | * the memory until the request is completed (which will |
| 125 | * happen on the other side of the migration). |
| 126 | */ |
| 127 | if (virtio_blk_handle_rw_error(req, -ret, is_read, true)) { |
| 128 | continue; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
| 133 | block_acct_done(blk_get_stats(s->blk), &req->acct); |
| 134 | g_free(req); |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | static void virtio_blk_flush_complete(void *opaque, int ret) |
| 139 | { |
| 140 | VirtIOBlockReq *req = opaque; |
| 141 | VirtIOBlock *s = req->dev; |
| 142 | |
| 143 | if (ret && virtio_blk_handle_rw_error(req, -ret, 0, true)) { |
| 144 | return; |
| 145 | } |
| 146 | |
| 147 | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
| 148 | block_acct_done(blk_get_stats(s->blk), &req->acct); |
| 149 | g_free(req); |
| 150 | } |
| 151 | |
| 152 | static void virtio_blk_discard_write_zeroes_complete(void *opaque, int ret) |
| 153 | { |
| 154 | VirtIOBlockReq *req = opaque; |
| 155 | VirtIOBlock *s = req->dev; |
| 156 | bool is_write_zeroes = (virtio_ldl_p(VIRTIO_DEVICE(s), &req->out.type) & |
| 157 | ~VIRTIO_BLK_T_BARRIER) == VIRTIO_BLK_T_WRITE_ZEROES; |
| 158 | |
| 159 | if (ret && virtio_blk_handle_rw_error(req, -ret, false, is_write_zeroes)) { |
| 160 | return; |
| 161 | } |
| 162 | |
| 163 | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
| 164 | if (is_write_zeroes) { |
| 165 | block_acct_done(blk_get_stats(s->blk), &req->acct); |
| 166 | } |
| 167 | g_free(req); |
| 168 | } |
| 169 | |
| 170 | static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s, VirtQueue *vq) |
| 171 | { |
| 172 | VirtIOBlockReq *req = virtqueue_pop(vq, sizeof(VirtIOBlockReq)); |
| 173 | |
| 174 | if (req) { |
| 175 | virtio_blk_init_request(s, vq, req); |
| 176 | } |
| 177 | return req; |
| 178 | } |
| 179 | |
| 180 | static void virtio_blk_handle_scsi(VirtIOBlockReq *req) |
| 181 | { |
| 182 | int status; |
| 183 | struct virtio_scsi_inhdr *scsi; |
| 184 | VirtIOBlock *blk = req->dev; |
| 185 | VirtIODevice *vdev = VIRTIO_DEVICE(blk); |
| 186 | VirtQueueElement *elem = &req->elem; |
| 187 | |
| 188 | /* |
| 189 | * We require at least one output segment each for the virtio_blk_outhdr |
| 190 | * and the SCSI command block. |
| 191 | * |
| 192 | * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr |
| 193 | * and the sense buffer pointer in the input segments. |
| 194 | */ |
| 195 | if (elem->out_num < 2 || elem->in_num < 3) { |
| 196 | status = VIRTIO_BLK_S_IOERR; |
| 197 | goto fail; |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * The scsi inhdr is placed in the second-to-last input segment, just |
| 202 | * before the regular inhdr. VIRTIO implementations normally do not rely on |
| 203 | * the precise message framing, but legacy implementations did and so we do |
| 204 | * too for the legacy virtio-blk SCSI request type. |
| 205 | * |
| 206 | * Just put anything nonzero so that the ioctl fails in the guest. |
| 207 | */ |
| 208 | if (elem->in_sg[elem->in_num - 2].iov_len != sizeof(*scsi)) { |
| 209 | status = VIRTIO_BLK_S_IOERR; |
| 210 | goto fail; |
| 211 | } |
| 212 | scsi = (void *)elem->in_sg[elem->in_num - 2].iov_base; |
| 213 | virtio_stl_p(vdev, &scsi->errors, 255); |
| 214 | status = VIRTIO_BLK_S_UNSUPP; |
| 215 | |
| 216 | fail: |
| 217 | virtio_blk_req_complete(req, status); |
| 218 | g_free(req); |
| 219 | } |
| 220 | |
| 221 | static inline void submit_requests(VirtIOBlock *s, MultiReqBuffer *mrb, |
| 222 | int start, int num_reqs, int niov) |
| 223 | { |
| 224 | BlockBackend *blk = s->blk; |
| 225 | QEMUIOVector *qiov = &mrb->reqs[start]->qiov; |
| 226 | int64_t sector_num = mrb->reqs[start]->sector_num; |
| 227 | bool is_write = mrb->is_write; |
| 228 | BdrvRequestFlags flags = 0; |
| 229 | |
| 230 | if (num_reqs > 1) { |
| 231 | int i; |
| 232 | struct iovec *tmp_iov = qiov->iov; |
| 233 | int tmp_niov = qiov->niov; |
| 234 | |
| 235 | /* mrb->reqs[start]->qiov was initialized from external so we can't |
| 236 | * modify it here. We need to initialize it locally and then add the |
| 237 | * external iovecs. */ |
| 238 | qemu_iovec_init(qiov, niov); |
| 239 | |
| 240 | for (i = 0; i < tmp_niov; i++) { |
| 241 | qemu_iovec_add(qiov, tmp_iov[i].iov_base, tmp_iov[i].iov_len); |
| 242 | } |
| 243 | |
| 244 | for (i = start + 1; i < start + num_reqs; i++) { |
| 245 | qemu_iovec_concat(qiov, &mrb->reqs[i]->qiov, 0, |
| 246 | mrb->reqs[i]->qiov.size); |
| 247 | mrb->reqs[i - 1]->mr_next = mrb->reqs[i]; |
| 248 | } |
| 249 | |
| 250 | trace_virtio_blk_submit_multireq(VIRTIO_DEVICE(mrb->reqs[start]->dev), |
| 251 | mrb, start, num_reqs, |
| 252 | sector_num << BDRV_SECTOR_BITS, |
| 253 | qiov->size, is_write); |
| 254 | block_acct_merge_done(blk_get_stats(blk), |
| 255 | is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ, |
| 256 | num_reqs - 1); |
| 257 | } |
| 258 | |
| 259 | if (blk_ram_registrar_ok(&s->blk_ram_registrar)) { |
| 260 | flags |= BDRV_REQ_REGISTERED_BUF; |
| 261 | } |
| 262 | |
| 263 | if (is_write) { |
| 264 | blk_aio_pwritev(blk, sector_num << BDRV_SECTOR_BITS, qiov, |
| 265 | flags, virtio_blk_rw_complete, |
| 266 | mrb->reqs[start]); |
| 267 | } else { |
| 268 | blk_aio_preadv(blk, sector_num << BDRV_SECTOR_BITS, qiov, |
| 269 | flags, virtio_blk_rw_complete, |
| 270 | mrb->reqs[start]); |
| 271 | } |
| 272 | } |
| 273 | |
| 274 | static int multireq_compare(const void *a, const void *b) |
| 275 | { |
| 276 | const VirtIOBlockReq *req1 = *(VirtIOBlockReq **)a, |
| 277 | *req2 = *(VirtIOBlockReq **)b; |
| 278 | |
| 279 | /* |
| 280 | * Note that we can't simply subtract sector_num1 from sector_num2 |
| 281 | * here as that could overflow the return value. |
| 282 | */ |
| 283 | if (req1->sector_num > req2->sector_num) { |
| 284 | return 1; |
| 285 | } else if (req1->sector_num < req2->sector_num) { |
| 286 | return -1; |
| 287 | } else { |
| 288 | return 0; |
| 289 | } |
| 290 | } |
| 291 | |
| 292 | static void virtio_blk_submit_multireq(VirtIOBlock *s, MultiReqBuffer *mrb) |
| 293 | { |
| 294 | int i = 0, start = 0, num_reqs = 0, niov = 0, nb_sectors = 0; |
| 295 | uint32_t max_transfer; |
| 296 | int64_t sector_num = 0; |
| 297 | |
| 298 | if (mrb->num_reqs == 1) { |
| 299 | submit_requests(s, mrb, 0, 1, -1); |
| 300 | mrb->num_reqs = 0; |
| 301 | return; |
| 302 | } |
| 303 | |
| 304 | max_transfer = blk_get_max_transfer(mrb->reqs[0]->dev->blk); |
| 305 | |
| 306 | qsort(mrb->reqs, mrb->num_reqs, sizeof(*mrb->reqs), |
| 307 | &multireq_compare); |
| 308 | |
| 309 | for (i = 0; i < mrb->num_reqs; i++) { |
| 310 | VirtIOBlockReq *req = mrb->reqs[i]; |
| 311 | if (num_reqs > 0) { |
| 312 | /* |
| 313 | * NOTE: We cannot merge the requests in below situations: |
| 314 | * 1. requests are not sequential |
| 315 | * 2. merge would exceed maximum number of IOVs |
| 316 | * 3. merge would exceed maximum transfer length of backend device |
| 317 | */ |
| 318 | if (sector_num + nb_sectors != req->sector_num || |
| 319 | niov > blk_get_max_iov(s->blk) - req->qiov.niov || |
| 320 | req->qiov.size > max_transfer || |
| 321 | nb_sectors > (max_transfer - |
| 322 | req->qiov.size) / BDRV_SECTOR_SIZE) { |
| 323 | submit_requests(s, mrb, start, num_reqs, niov); |
| 324 | num_reqs = 0; |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | if (num_reqs == 0) { |
| 329 | sector_num = req->sector_num; |
| 330 | nb_sectors = niov = 0; |
| 331 | start = i; |
| 332 | } |
| 333 | |
| 334 | nb_sectors += req->qiov.size / BDRV_SECTOR_SIZE; |
| 335 | niov += req->qiov.niov; |
| 336 | num_reqs++; |
| 337 | } |
| 338 | |
| 339 | submit_requests(s, mrb, start, num_reqs, niov); |
| 340 | mrb->num_reqs = 0; |
| 341 | } |
| 342 | |
| 343 | static void virtio_blk_handle_flush(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
| 344 | { |
| 345 | VirtIOBlock *s = req->dev; |
| 346 | |
| 347 | block_acct_start(blk_get_stats(s->blk), &req->acct, 0, |
| 348 | BLOCK_ACCT_FLUSH); |
| 349 | |
| 350 | /* |
| 351 | * Make sure all outstanding writes are posted to the backing device. |
| 352 | */ |
| 353 | if (mrb->is_write && mrb->num_reqs > 0) { |
| 354 | virtio_blk_submit_multireq(s, mrb); |
| 355 | } |
| 356 | blk_aio_flush(s->blk, virtio_blk_flush_complete, req); |
| 357 | } |
| 358 | |
| 359 | static bool virtio_blk_sect_range_ok(VirtIOBlock *dev, |
| 360 | uint64_t sector, size_t size) |
| 361 | { |
| 362 | uint64_t nb_sectors = size >> BDRV_SECTOR_BITS; |
| 363 | uint64_t total_sectors; |
| 364 | |
| 365 | if (nb_sectors > BDRV_REQUEST_MAX_SECTORS) { |
| 366 | return false; |
| 367 | } |
| 368 | if (sector & dev->sector_mask) { |
| 369 | return false; |
| 370 | } |
| 371 | if (size % dev->conf.conf.logical_block_size) { |
| 372 | return false; |
| 373 | } |
| 374 | blk_get_geometry(dev->blk, &total_sectors); |
| 375 | if (sector > total_sectors || nb_sectors > total_sectors - sector) { |
| 376 | return false; |
| 377 | } |
| 378 | return true; |
| 379 | } |
| 380 | |
| 381 | static uint8_t virtio_blk_handle_discard_write_zeroes(VirtIOBlockReq *req, |
| 382 | struct virtio_blk_discard_write_zeroes *dwz_hdr, bool is_write_zeroes) |
| 383 | { |
| 384 | VirtIOBlock *s = req->dev; |
| 385 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 386 | uint64_t sector; |
| 387 | uint32_t num_sectors, flags, max_sectors; |
| 388 | uint8_t err_status; |
| 389 | int bytes; |
| 390 | |
| 391 | sector = virtio_ldq_p(vdev, &dwz_hdr->sector); |
| 392 | num_sectors = virtio_ldl_p(vdev, &dwz_hdr->num_sectors); |
| 393 | flags = virtio_ldl_p(vdev, &dwz_hdr->flags); |
| 394 | max_sectors = is_write_zeroes ? s->conf.max_write_zeroes_sectors : |
| 395 | s->conf.max_discard_sectors; |
| 396 | |
| 397 | /* |
| 398 | * max_sectors is at most BDRV_REQUEST_MAX_SECTORS, this check |
| 399 | * make us sure that "num_sectors << BDRV_SECTOR_BITS" can fit in |
| 400 | * the integer variable. |
| 401 | */ |
| 402 | if (unlikely(num_sectors > max_sectors)) { |
| 403 | err_status = VIRTIO_BLK_S_IOERR; |
| 404 | goto err; |
| 405 | } |
| 406 | |
| 407 | bytes = num_sectors << BDRV_SECTOR_BITS; |
| 408 | |
| 409 | if (unlikely(!virtio_blk_sect_range_ok(s, sector, bytes))) { |
| 410 | err_status = VIRTIO_BLK_S_IOERR; |
| 411 | goto err; |
| 412 | } |
| 413 | |
| 414 | /* |
| 415 | * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for discard |
| 416 | * and write zeroes commands if any unknown flag is set. |
| 417 | */ |
| 418 | if (unlikely(flags & ~VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { |
| 419 | err_status = VIRTIO_BLK_S_UNSUPP; |
| 420 | goto err; |
| 421 | } |
| 422 | |
| 423 | if (is_write_zeroes) { /* VIRTIO_BLK_T_WRITE_ZEROES */ |
| 424 | int blk_aio_flags = 0; |
| 425 | |
| 426 | if (flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP) { |
| 427 | blk_aio_flags |= BDRV_REQ_MAY_UNMAP; |
| 428 | } |
| 429 | |
| 430 | block_acct_start(blk_get_stats(s->blk), &req->acct, bytes, |
| 431 | BLOCK_ACCT_WRITE); |
| 432 | |
| 433 | blk_aio_pwrite_zeroes(s->blk, sector << BDRV_SECTOR_BITS, |
| 434 | bytes, blk_aio_flags, |
| 435 | virtio_blk_discard_write_zeroes_complete, req); |
| 436 | } else { /* VIRTIO_BLK_T_DISCARD */ |
| 437 | /* |
| 438 | * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP for |
| 439 | * discard commands if the unmap flag is set. |
| 440 | */ |
| 441 | if (unlikely(flags & VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP)) { |
| 442 | err_status = VIRTIO_BLK_S_UNSUPP; |
| 443 | goto err; |
| 444 | } |
| 445 | |
| 446 | blk_aio_pdiscard(s->blk, sector << BDRV_SECTOR_BITS, bytes, |
| 447 | virtio_blk_discard_write_zeroes_complete, req); |
| 448 | } |
| 449 | |
| 450 | return VIRTIO_BLK_S_OK; |
| 451 | |
| 452 | err: |
| 453 | if (is_write_zeroes) { |
| 454 | block_acct_invalid(blk_get_stats(s->blk), BLOCK_ACCT_WRITE); |
| 455 | } |
| 456 | return err_status; |
| 457 | } |
| 458 | |
| 459 | typedef struct { |
| 460 | unsigned int total_nr_zones; /* max zones to fill in this request */ |
| 461 | unsigned int nr_zones_done; /* how many zones have been filled in */ |
| 462 | int64_t iov_offset; /* current byte position in in_iov[] */ |
| 463 | int64_t offset; /* current zone report disk offset */ |
| 464 | unsigned int nr_zones; /* for zone report calls */ |
| 465 | unsigned int zones_per_batch; /* size of zone report buffer */ |
| 466 | BlockZoneDescriptor *zones; /* zone report buffer */ |
| 467 | } ZoneReportData; |
| 468 | |
| 469 | typedef struct ZoneCmdData { |
| 470 | VirtIOBlockReq *req; |
| 471 | struct iovec *in_iov; |
| 472 | unsigned in_num; |
| 473 | union { |
| 474 | ZoneReportData zone_report_data; |
| 475 | struct { |
| 476 | int64_t offset; |
| 477 | } zone_append_data; |
| 478 | }; |
| 479 | } ZoneCmdData; |
| 480 | |
| 481 | /* |
| 482 | * check zoned_request: error checking before issuing requests. If all checks |
| 483 | * passed, return true. |
| 484 | * append: true if only zone append requests issued. |
| 485 | */ |
| 486 | static bool check_zoned_request(VirtIOBlock *s, int64_t offset, int64_t len, |
| 487 | bool append, uint8_t *status) { |
| 488 | BlockDriverState *bs = blk_bs(s->blk); |
| 489 | int index; |
| 490 | |
| 491 | if (!virtio_has_feature(s->host_features, VIRTIO_BLK_F_ZONED)) { |
| 492 | *status = VIRTIO_BLK_S_UNSUPP; |
| 493 | return false; |
| 494 | } |
| 495 | |
| 496 | if (offset < 0 || len < 0 || len > (bs->total_sectors << BDRV_SECTOR_BITS) |
| 497 | || offset > (bs->total_sectors << BDRV_SECTOR_BITS) - len) { |
| 498 | *status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 499 | return false; |
| 500 | } |
| 501 | |
| 502 | if (append) { |
| 503 | if (bs->bl.write_granularity) { |
| 504 | if ((offset % bs->bl.write_granularity) != 0) { |
| 505 | *status = VIRTIO_BLK_S_ZONE_UNALIGNED_WP; |
| 506 | return false; |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | index = offset / bs->bl.zone_size; |
| 511 | if (BDRV_ZT_IS_CONV(bs->wps->wp[index])) { |
| 512 | *status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 513 | return false; |
| 514 | } |
| 515 | |
| 516 | if (len / 512 > bs->bl.max_append_sectors) { |
| 517 | if (bs->bl.max_append_sectors == 0) { |
| 518 | *status = VIRTIO_BLK_S_UNSUPP; |
| 519 | } else { |
| 520 | *status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 521 | } |
| 522 | return false; |
| 523 | } |
| 524 | } |
| 525 | return true; |
| 526 | } |
| 527 | |
| 528 | static void virtio_blk_zone_report_complete(void *opaque, int ret) |
| 529 | { |
| 530 | ZoneCmdData *data = opaque; |
| 531 | ZoneReportData *zrd = &data->zone_report_data; |
| 532 | VirtIOBlockReq *req = data->req; |
| 533 | VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); |
| 534 | struct iovec *in_iov = data->in_iov; |
| 535 | unsigned in_num = data->in_num; |
| 536 | int64_t n; |
| 537 | unsigned nz = zrd->nr_zones; |
| 538 | int8_t err_status = VIRTIO_BLK_S_OK; |
| 539 | struct virtio_blk_zone_report zrp_hdr = {}; |
| 540 | |
| 541 | trace_virtio_blk_zone_report_complete(vdev, req, nz, ret); |
| 542 | if (ret) { |
| 543 | err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 544 | goto out; |
| 545 | } |
| 546 | |
| 547 | for (unsigned j = 0; j < nz; j++) { |
| 548 | struct virtio_blk_zone_descriptor desc = |
| 549 | (struct virtio_blk_zone_descriptor) { |
| 550 | .z_start = cpu_to_le64(zrd->zones[j].start |
| 551 | >> BDRV_SECTOR_BITS), |
| 552 | .z_cap = cpu_to_le64(zrd->zones[j].cap |
| 553 | >> BDRV_SECTOR_BITS), |
| 554 | .z_wp = cpu_to_le64(zrd->zones[j].wp |
| 555 | >> BDRV_SECTOR_BITS), |
| 556 | }; |
| 557 | |
| 558 | switch (zrd->zones[j].type) { |
| 559 | case BLK_ZT_CONV: |
| 560 | desc.z_type = VIRTIO_BLK_ZT_CONV; |
| 561 | break; |
| 562 | case BLK_ZT_SWR: |
| 563 | desc.z_type = VIRTIO_BLK_ZT_SWR; |
| 564 | break; |
| 565 | case BLK_ZT_SWP: |
| 566 | desc.z_type = VIRTIO_BLK_ZT_SWP; |
| 567 | break; |
| 568 | default: |
| 569 | g_assert_not_reached(); |
| 570 | } |
| 571 | |
| 572 | switch (zrd->zones[j].state) { |
| 573 | case BLK_ZS_RDONLY: |
| 574 | desc.z_state = VIRTIO_BLK_ZS_RDONLY; |
| 575 | break; |
| 576 | case BLK_ZS_OFFLINE: |
| 577 | desc.z_state = VIRTIO_BLK_ZS_OFFLINE; |
| 578 | break; |
| 579 | case BLK_ZS_EMPTY: |
| 580 | desc.z_state = VIRTIO_BLK_ZS_EMPTY; |
| 581 | break; |
| 582 | case BLK_ZS_CLOSED: |
| 583 | desc.z_state = VIRTIO_BLK_ZS_CLOSED; |
| 584 | break; |
| 585 | case BLK_ZS_FULL: |
| 586 | desc.z_state = VIRTIO_BLK_ZS_FULL; |
| 587 | break; |
| 588 | case BLK_ZS_EOPEN: |
| 589 | desc.z_state = VIRTIO_BLK_ZS_EOPEN; |
| 590 | break; |
| 591 | case BLK_ZS_IOPEN: |
| 592 | desc.z_state = VIRTIO_BLK_ZS_IOPEN; |
| 593 | break; |
| 594 | case BLK_ZS_NOT_WP: |
| 595 | desc.z_state = VIRTIO_BLK_ZS_NOT_WP; |
| 596 | break; |
| 597 | default: |
| 598 | g_assert_not_reached(); |
| 599 | } |
| 600 | |
| 601 | /* TODO: it takes O(n^2) time complexity. Optimizations required. */ |
| 602 | n = iov_from_buf(in_iov, in_num, zrd->iov_offset, &desc, sizeof(desc)); |
| 603 | if (n != sizeof(desc)) { |
| 604 | virtio_error(vdev, "Driver provided input buffer " |
| 605 | "for descriptors that is too small!"); |
| 606 | err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 607 | goto out; |
| 608 | } |
| 609 | |
| 610 | zrd->iov_offset += sizeof(desc); |
| 611 | } |
| 612 | |
| 613 | if (nz > 0) { |
| 614 | BlockZoneDescriptor *zone = &zrd->zones[nz - 1]; |
| 615 | zrd->offset = zone->start + zone->length; |
| 616 | } |
| 617 | |
| 618 | zrd->nr_zones_done += nz; |
| 619 | |
| 620 | /* Call zone report again if the end hasn't been reached yet */ |
| 621 | if (nz == zrd->zones_per_batch && |
| 622 | zrd->nr_zones_done < zrd->total_nr_zones) { |
| 623 | zrd->nr_zones = MIN(zrd->zones_per_batch, |
| 624 | zrd->total_nr_zones - zrd->nr_zones_done); |
| 625 | blk_aio_zone_report(req->dev->blk, zrd->offset, &zrd->nr_zones, |
| 626 | zrd->zones, virtio_blk_zone_report_complete, data); |
| 627 | return; |
| 628 | } |
| 629 | |
| 630 | /* Fill in header now that all zones have been reported */ |
| 631 | zrp_hdr.nr_zones = cpu_to_le64(zrd->nr_zones_done); |
| 632 | n = iov_from_buf(in_iov, in_num, 0, &zrp_hdr, sizeof(zrp_hdr)); |
| 633 | if (n != sizeof(zrp_hdr)) { |
| 634 | virtio_error(vdev, "Driver provided input buffer that is too small!"); |
| 635 | err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 636 | goto out; |
| 637 | } |
| 638 | |
| 639 | out: |
| 640 | virtio_blk_req_complete(req, err_status); |
| 641 | g_free(req); |
| 642 | g_free(zrd->zones); |
| 643 | g_free(data); |
| 644 | } |
| 645 | |
| 646 | static void virtio_blk_handle_zone_report(VirtIOBlockReq *req, |
| 647 | struct iovec *in_iov, |
| 648 | unsigned in_num) |
| 649 | { |
| 650 | VirtIOBlock *s = req->dev; |
| 651 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 652 | unsigned int nr_zones; |
| 653 | ZoneCmdData *data; |
| 654 | ZoneReportData *zrd; |
| 655 | int64_t offset; |
| 656 | uint8_t err_status; |
| 657 | |
| 658 | if (req->in_len < sizeof(struct virtio_blk_inhdr) + |
| 659 | sizeof(struct virtio_blk_zone_report) + |
| 660 | sizeof(struct virtio_blk_zone_descriptor)) { |
| 661 | virtio_error(vdev, "in buffer too small for zone report"); |
| 662 | err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 663 | goto out; |
| 664 | } |
| 665 | |
| 666 | /* start byte offset of the zone report */ |
| 667 | offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS; |
| 668 | if (!check_zoned_request(s, offset, 0, false, &err_status)) { |
| 669 | goto out; |
| 670 | } |
| 671 | nr_zones = (req->in_len - sizeof(struct virtio_blk_inhdr) - |
| 672 | sizeof(struct virtio_blk_zone_report)) / |
| 673 | sizeof(struct virtio_blk_zone_descriptor); |
| 674 | trace_virtio_blk_handle_zone_report(vdev, req, |
| 675 | offset >> BDRV_SECTOR_BITS, nr_zones); |
| 676 | |
| 677 | data = g_malloc(sizeof(ZoneCmdData)); |
| 678 | data->req = req; |
| 679 | data->in_iov = in_iov; |
| 680 | data->in_num = in_num; |
| 681 | |
| 682 | zrd = &data->zone_report_data; |
| 683 | zrd->total_nr_zones = nr_zones; |
| 684 | zrd->nr_zones_done = 0; |
| 685 | zrd->iov_offset = sizeof(struct virtio_blk_zone_report); |
| 686 | zrd->offset = offset; |
| 687 | zrd->zones_per_batch = MIN(nr_zones, VIRTIO_BLK_MAX_ZONES_PER_BATCH); |
| 688 | zrd->zones = g_malloc(zrd->zones_per_batch * sizeof(BlockZoneDescriptor)); |
| 689 | |
| 690 | zrd->nr_zones = zrd->zones_per_batch; |
| 691 | blk_aio_zone_report(s->blk, offset, &zrd->nr_zones, zrd->zones, |
| 692 | virtio_blk_zone_report_complete, data); |
| 693 | return; |
| 694 | out: |
| 695 | virtio_blk_req_complete(req, err_status); |
| 696 | g_free(req); |
| 697 | } |
| 698 | |
| 699 | static void virtio_blk_zone_mgmt_complete(void *opaque, int ret) |
| 700 | { |
| 701 | VirtIOBlockReq *req = opaque; |
| 702 | VirtIOBlock *s = req->dev; |
| 703 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 704 | int8_t err_status = VIRTIO_BLK_S_OK; |
| 705 | trace_virtio_blk_zone_mgmt_complete(vdev, req,ret); |
| 706 | |
| 707 | if (ret) { |
| 708 | err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 709 | } |
| 710 | |
| 711 | virtio_blk_req_complete(req, err_status); |
| 712 | g_free(req); |
| 713 | } |
| 714 | |
| 715 | static int virtio_blk_handle_zone_mgmt(VirtIOBlockReq *req, BlockZoneOp op) |
| 716 | { |
| 717 | VirtIOBlock *s = req->dev; |
| 718 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 719 | BlockDriverState *bs = blk_bs(s->blk); |
| 720 | int64_t offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS; |
| 721 | uint64_t len; |
| 722 | uint64_t capacity = bs->total_sectors << BDRV_SECTOR_BITS; |
| 723 | uint8_t err_status = VIRTIO_BLK_S_OK; |
| 724 | |
| 725 | uint32_t type = virtio_ldl_p(vdev, &req->out.type); |
| 726 | if (type == VIRTIO_BLK_T_ZONE_RESET_ALL) { |
| 727 | /* Entire drive capacity */ |
| 728 | offset = 0; |
| 729 | len = capacity; |
| 730 | trace_virtio_blk_handle_zone_reset_all(vdev, req, 0, |
| 731 | bs->total_sectors); |
| 732 | } else { |
| 733 | if (bs->bl.zone_size > capacity - offset) { |
| 734 | /* The zoned device allows the last smaller zone. */ |
| 735 | len = capacity - bs->bl.zone_size * (bs->bl.nr_zones - 1ull); |
| 736 | } else { |
| 737 | len = bs->bl.zone_size; |
| 738 | } |
| 739 | trace_virtio_blk_handle_zone_mgmt(vdev, req, op, |
| 740 | offset >> BDRV_SECTOR_BITS, |
| 741 | len >> BDRV_SECTOR_BITS); |
| 742 | } |
| 743 | |
| 744 | if (!check_zoned_request(s, offset, len, false, &err_status)) { |
| 745 | goto out; |
| 746 | } |
| 747 | |
| 748 | blk_aio_zone_mgmt(s->blk, op, offset, len, |
| 749 | virtio_blk_zone_mgmt_complete, req); |
| 750 | |
| 751 | return 0; |
| 752 | out: |
| 753 | virtio_blk_req_complete(req, err_status); |
| 754 | g_free(req); |
| 755 | return err_status; |
| 756 | } |
| 757 | |
| 758 | static void virtio_blk_zone_append_complete(void *opaque, int ret) |
| 759 | { |
| 760 | ZoneCmdData *data = opaque; |
| 761 | VirtIOBlockReq *req = data->req; |
| 762 | VirtIODevice *vdev = VIRTIO_DEVICE(req->dev); |
| 763 | int64_t append_sector, n; |
| 764 | uint8_t err_status = VIRTIO_BLK_S_OK; |
| 765 | |
| 766 | if (ret) { |
| 767 | err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 768 | goto out; |
| 769 | } |
| 770 | |
| 771 | virtio_stq_p(vdev, &append_sector, |
| 772 | data->zone_append_data.offset >> BDRV_SECTOR_BITS); |
| 773 | n = iov_from_buf(data->in_iov, data->in_num, 0, &append_sector, |
| 774 | sizeof(append_sector)); |
| 775 | if (n != sizeof(append_sector)) { |
| 776 | virtio_error(vdev, "Driver provided input buffer less than size of " |
| 777 | "append_sector"); |
| 778 | err_status = VIRTIO_BLK_S_ZONE_INVALID_CMD; |
| 779 | goto out; |
| 780 | } |
| 781 | trace_virtio_blk_zone_append_complete(vdev, req, append_sector, ret); |
| 782 | |
| 783 | out: |
| 784 | virtio_blk_req_complete(req, err_status); |
| 785 | g_free(req); |
| 786 | g_free(data); |
| 787 | } |
| 788 | |
| 789 | static int virtio_blk_handle_zone_append(VirtIOBlockReq *req, |
| 790 | struct iovec *out_iov, |
| 791 | struct iovec *in_iov, |
| 792 | uint64_t out_num, |
| 793 | unsigned in_num) { |
| 794 | VirtIOBlock *s = req->dev; |
| 795 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 796 | uint8_t err_status = VIRTIO_BLK_S_OK; |
| 797 | |
| 798 | int64_t offset = virtio_ldq_p(vdev, &req->out.sector) << BDRV_SECTOR_BITS; |
| 799 | int64_t len = iov_size(out_iov, out_num); |
| 800 | ZoneCmdData *data; |
| 801 | |
| 802 | trace_virtio_blk_handle_zone_append(vdev, req, offset >> BDRV_SECTOR_BITS); |
| 803 | if (!check_zoned_request(s, offset, len, true, &err_status)) { |
| 804 | goto out; |
| 805 | } |
| 806 | |
| 807 | data = g_malloc(sizeof(ZoneCmdData)); |
| 808 | data->req = req; |
| 809 | data->in_iov = in_iov; |
| 810 | data->in_num = in_num; |
| 811 | data->zone_append_data.offset = offset; |
| 812 | qemu_iovec_init_external(&req->qiov, out_iov, out_num); |
| 813 | |
| 814 | block_acct_start(blk_get_stats(s->blk), &req->acct, len, |
| 815 | BLOCK_ACCT_ZONE_APPEND); |
| 816 | |
| 817 | blk_aio_zone_append(s->blk, &data->zone_append_data.offset, &req->qiov, 0, |
| 818 | virtio_blk_zone_append_complete, data); |
| 819 | return 0; |
| 820 | |
| 821 | out: |
| 822 | virtio_blk_req_complete(req, err_status); |
| 823 | g_free(req); |
| 824 | return err_status; |
| 825 | } |
| 826 | |
| 827 | static int virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb) |
| 828 | { |
| 829 | uint32_t type; |
| 830 | struct iovec *in_iov = req->elem.in_sg; |
| 831 | struct iovec *out_iov = req->elem.out_sg; |
| 832 | unsigned in_num = req->elem.in_num; |
| 833 | unsigned out_num = req->elem.out_num; |
| 834 | VirtIOBlock *s = req->dev; |
| 835 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 836 | |
| 837 | if (req->elem.out_num < 1 || req->elem.in_num < 1) { |
| 838 | virtio_error(vdev, "virtio-blk missing headers"); |
| 839 | return -1; |
| 840 | } |
| 841 | |
| 842 | if (unlikely(iov_to_buf(out_iov, out_num, 0, &req->out, |
| 843 | sizeof(req->out)) != sizeof(req->out))) { |
| 844 | virtio_error(vdev, "virtio-blk request outhdr too short"); |
| 845 | return -1; |
| 846 | } |
| 847 | |
| 848 | iov_discard_front_undoable(&out_iov, &out_num, sizeof(req->out), |
| 849 | &req->outhdr_undo); |
| 850 | |
| 851 | if (in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) { |
| 852 | virtio_error(vdev, "virtio-blk request inhdr too short"); |
| 853 | iov_discard_undo(&req->outhdr_undo); |
| 854 | return -1; |
| 855 | } |
| 856 | |
| 857 | /* We always touch the last byte, so just see how big in_iov is. */ |
| 858 | req->in_len = iov_size(in_iov, in_num); |
| 859 | req->in = (void *)in_iov[in_num - 1].iov_base |
| 860 | + in_iov[in_num - 1].iov_len |
| 861 | - sizeof(struct virtio_blk_inhdr); |
| 862 | iov_discard_back_undoable(in_iov, &in_num, sizeof(struct virtio_blk_inhdr), |
| 863 | &req->inhdr_undo); |
| 864 | |
| 865 | type = virtio_ldl_p(vdev, &req->out.type); |
| 866 | |
| 867 | /* VIRTIO_BLK_T_OUT defines the command direction. VIRTIO_BLK_T_BARRIER |
| 868 | * is an optional flag. Although a guest should not send this flag if |
| 869 | * not negotiated we ignored it in the past. So keep ignoring it. */ |
| 870 | switch (type & ~(VIRTIO_BLK_T_OUT | VIRTIO_BLK_T_BARRIER)) { |
| 871 | case VIRTIO_BLK_T_IN: |
| 872 | { |
| 873 | bool is_write = type & VIRTIO_BLK_T_OUT; |
| 874 | req->sector_num = virtio_ldq_p(vdev, &req->out.sector); |
| 875 | |
| 876 | if (is_write) { |
| 877 | qemu_iovec_init_external(&req->qiov, out_iov, out_num); |
| 878 | trace_virtio_blk_handle_write(vdev, req, req->sector_num, |
| 879 | req->qiov.size / BDRV_SECTOR_SIZE); |
| 880 | } else { |
| 881 | qemu_iovec_init_external(&req->qiov, in_iov, in_num); |
| 882 | trace_virtio_blk_handle_read(vdev, req, req->sector_num, |
| 883 | req->qiov.size / BDRV_SECTOR_SIZE); |
| 884 | } |
| 885 | |
| 886 | if (!virtio_blk_sect_range_ok(s, req->sector_num, req->qiov.size)) { |
| 887 | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
| 888 | block_acct_invalid(blk_get_stats(s->blk), |
| 889 | is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); |
| 890 | g_free(req); |
| 891 | return 0; |
| 892 | } |
| 893 | |
| 894 | block_acct_start(blk_get_stats(s->blk), &req->acct, req->qiov.size, |
| 895 | is_write ? BLOCK_ACCT_WRITE : BLOCK_ACCT_READ); |
| 896 | |
| 897 | /* merge would exceed maximum number of requests or IO direction |
| 898 | * changes */ |
| 899 | if (mrb->num_reqs > 0 && (mrb->num_reqs == VIRTIO_BLK_MAX_MERGE_REQS || |
| 900 | is_write != mrb->is_write || |
| 901 | !s->conf.request_merging)) { |
| 902 | virtio_blk_submit_multireq(s, mrb); |
| 903 | } |
| 904 | |
| 905 | assert(mrb->num_reqs < VIRTIO_BLK_MAX_MERGE_REQS); |
| 906 | mrb->reqs[mrb->num_reqs++] = req; |
| 907 | mrb->is_write = is_write; |
| 908 | break; |
| 909 | } |
| 910 | case VIRTIO_BLK_T_FLUSH: |
| 911 | virtio_blk_handle_flush(req, mrb); |
| 912 | break; |
| 913 | case VIRTIO_BLK_T_ZONE_REPORT: |
| 914 | virtio_blk_handle_zone_report(req, in_iov, in_num); |
| 915 | break; |
| 916 | case VIRTIO_BLK_T_ZONE_OPEN: |
| 917 | virtio_blk_handle_zone_mgmt(req, BLK_ZO_OPEN); |
| 918 | break; |
| 919 | case VIRTIO_BLK_T_ZONE_CLOSE: |
| 920 | virtio_blk_handle_zone_mgmt(req, BLK_ZO_CLOSE); |
| 921 | break; |
| 922 | case VIRTIO_BLK_T_ZONE_FINISH: |
| 923 | virtio_blk_handle_zone_mgmt(req, BLK_ZO_FINISH); |
| 924 | break; |
| 925 | case VIRTIO_BLK_T_ZONE_RESET: |
| 926 | virtio_blk_handle_zone_mgmt(req, BLK_ZO_RESET); |
| 927 | break; |
| 928 | case VIRTIO_BLK_T_ZONE_RESET_ALL: |
| 929 | virtio_blk_handle_zone_mgmt(req, BLK_ZO_RESET); |
| 930 | break; |
| 931 | case VIRTIO_BLK_T_SCSI_CMD: |
| 932 | virtio_blk_handle_scsi(req); |
| 933 | break; |
| 934 | case VIRTIO_BLK_T_GET_ID: |
| 935 | { |
| 936 | /* |
| 937 | * NB: per existing s/n string convention the string is |
| 938 | * terminated by '\0' only when shorter than buffer. |
| 939 | */ |
| 940 | const char *serial = s->conf.serial ? s->conf.serial : ""; |
| 941 | size_t size = MIN(strlen(serial) + 1, |
| 942 | MIN(iov_size(in_iov, in_num), |
| 943 | VIRTIO_BLK_ID_BYTES)); |
| 944 | iov_from_buf(in_iov, in_num, 0, serial, size); |
| 945 | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
| 946 | g_free(req); |
| 947 | break; |
| 948 | } |
| 949 | case VIRTIO_BLK_T_ZONE_APPEND & ~VIRTIO_BLK_T_OUT: |
| 950 | /* |
| 951 | * Passing out_iov/out_num and in_iov/in_num is not safe |
| 952 | * to access req->elem.out_sg directly because it may be |
| 953 | * modified by virtio_blk_handle_request(). |
| 954 | */ |
| 955 | virtio_blk_handle_zone_append(req, out_iov, in_iov, out_num, in_num); |
| 956 | break; |
| 957 | /* |
| 958 | * VIRTIO_BLK_T_DISCARD and VIRTIO_BLK_T_WRITE_ZEROES are defined with |
| 959 | * VIRTIO_BLK_T_OUT flag set. We masked this flag in the switch statement, |
| 960 | * so we must mask it for these requests, then we will check if it is set. |
| 961 | */ |
| 962 | case VIRTIO_BLK_T_DISCARD & ~VIRTIO_BLK_T_OUT: |
| 963 | case VIRTIO_BLK_T_WRITE_ZEROES & ~VIRTIO_BLK_T_OUT: |
| 964 | { |
| 965 | struct virtio_blk_discard_write_zeroes dwz_hdr; |
| 966 | size_t out_len = iov_size(out_iov, out_num); |
| 967 | bool is_write_zeroes = (type & ~VIRTIO_BLK_T_BARRIER) == |
| 968 | VIRTIO_BLK_T_WRITE_ZEROES; |
| 969 | uint8_t err_status; |
| 970 | |
| 971 | /* |
| 972 | * Unsupported if VIRTIO_BLK_T_OUT is not set or the request contains |
| 973 | * more than one segment. |
| 974 | */ |
| 975 | if (unlikely(!(type & VIRTIO_BLK_T_OUT) || |
| 976 | out_len > sizeof(dwz_hdr))) { |
| 977 | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); |
| 978 | g_free(req); |
| 979 | return 0; |
| 980 | } |
| 981 | |
| 982 | if (unlikely(iov_to_buf(out_iov, out_num, 0, &dwz_hdr, |
| 983 | sizeof(dwz_hdr)) != sizeof(dwz_hdr))) { |
| 984 | iov_discard_undo(&req->inhdr_undo); |
| 985 | iov_discard_undo(&req->outhdr_undo); |
| 986 | virtio_error(vdev, "virtio-blk discard/write_zeroes header" |
| 987 | " too short"); |
| 988 | return -1; |
| 989 | } |
| 990 | |
| 991 | err_status = virtio_blk_handle_discard_write_zeroes(req, &dwz_hdr, |
| 992 | is_write_zeroes); |
| 993 | if (err_status != VIRTIO_BLK_S_OK) { |
| 994 | virtio_blk_req_complete(req, err_status); |
| 995 | g_free(req); |
| 996 | } |
| 997 | |
| 998 | break; |
| 999 | } |
| 1000 | default: |
| 1001 | { |
| 1002 | /* |
| 1003 | * Give subclasses a chance to handle unknown requests. This way the |
| 1004 | * class lookup is not in the hot path. |
| 1005 | */ |
| 1006 | VirtIOBlkClass *vbk = VIRTIO_BLK_GET_CLASS(s); |
| 1007 | if (!vbk->handle_unknown_request || |
| 1008 | !vbk->handle_unknown_request(req, mrb, type)) { |
| 1009 | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); |
| 1010 | g_free(req); |
| 1011 | } |
| 1012 | } |
| 1013 | } |
| 1014 | return 0; |
| 1015 | } |
| 1016 | |
| 1017 | void virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq) |
| 1018 | { |
| 1019 | VirtIOBlockReq *req; |
| 1020 | MultiReqBuffer mrb = {}; |
| 1021 | bool suppress_notifications = virtio_queue_get_notification(vq); |
| 1022 | |
| 1023 | defer_call_begin(); |
| 1024 | |
| 1025 | do { |
| 1026 | if (suppress_notifications) { |
| 1027 | virtio_queue_set_notification(vq, 0); |
| 1028 | } |
| 1029 | |
| 1030 | while ((req = virtio_blk_get_request(s, vq))) { |
| 1031 | if (virtio_blk_handle_request(req, &mrb)) { |
| 1032 | virtqueue_detach_element(req->vq, &req->elem, 0); |
| 1033 | g_free(req); |
| 1034 | break; |
| 1035 | } |
| 1036 | } |
| 1037 | |
| 1038 | if (suppress_notifications) { |
| 1039 | virtio_queue_set_notification(vq, 1); |
| 1040 | } |
| 1041 | } while (!virtio_queue_empty(vq)); |
| 1042 | |
| 1043 | if (mrb.num_reqs) { |
| 1044 | virtio_blk_submit_multireq(s, &mrb); |
| 1045 | } |
| 1046 | |
| 1047 | defer_call_end(); |
| 1048 | } |
| 1049 | |
| 1050 | static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
| 1051 | { |
| 1052 | VirtIOBlock *s = (VirtIOBlock *)vdev; |
| 1053 | |
| 1054 | if (!s->ioeventfd_disabled && !s->ioeventfd_started) { |
| 1055 | /* Some guests kick before setting VIRTIO_CONFIG_S_DRIVER_OK so start |
| 1056 | * ioeventfd here instead of waiting for .set_status(). |
| 1057 | */ |
| 1058 | virtio_device_start_ioeventfd(vdev); |
| 1059 | if (!s->ioeventfd_disabled) { |
| 1060 | return; |
| 1061 | } |
| 1062 | } |
| 1063 | |
| 1064 | virtio_blk_handle_vq(s, vq); |
| 1065 | } |
| 1066 | |
| 1067 | static void virtio_blk_dma_restart_bh(void *opaque) |
| 1068 | { |
| 1069 | VirtIOBlockReq *req = opaque; |
| 1070 | VirtIOBlock *s = req->dev; /* we're called with at least one request */ |
| 1071 | |
| 1072 | MultiReqBuffer mrb = {}; |
| 1073 | |
| 1074 | while (req) { |
| 1075 | VirtIOBlockReq *next = req->next; |
| 1076 | if (virtio_blk_handle_request(req, &mrb)) { |
| 1077 | /* Device is now broken and won't do any processing until it gets |
| 1078 | * reset. Already queued requests will be lost: let's purge them. |
| 1079 | */ |
| 1080 | while (req) { |
| 1081 | next = req->next; |
| 1082 | virtqueue_detach_element(req->vq, &req->elem, 0); |
| 1083 | g_free(req); |
| 1084 | req = next; |
| 1085 | } |
| 1086 | break; |
| 1087 | } |
| 1088 | req = next; |
| 1089 | } |
| 1090 | |
| 1091 | if (mrb.num_reqs) { |
| 1092 | virtio_blk_submit_multireq(s, &mrb); |
| 1093 | } |
| 1094 | |
| 1095 | /* Paired with inc in virtio_blk_dma_restart_cb() */ |
| 1096 | blk_dec_in_flight(s->conf.conf.blk); |
| 1097 | } |
| 1098 | |
| 1099 | static void virtio_blk_dma_restart_cb(void *opaque, bool running, |
| 1100 | RunState state) |
| 1101 | { |
| 1102 | VirtIOBlock *s = opaque; |
| 1103 | uint16_t num_queues = s->conf.num_queues; |
| 1104 | g_autofree VirtIOBlockReq **vq_rq = NULL; |
| 1105 | VirtIOBlockReq *rq = NULL; |
| 1106 | |
| 1107 | if (!running) { |
| 1108 | return; |
| 1109 | } |
| 1110 | |
| 1111 | /* Split the device-wide s->rq request list into per-vq request lists */ |
| 1112 | vq_rq = g_new0(VirtIOBlockReq *, num_queues); |
| 1113 | |
| 1114 | WITH_QEMU_LOCK_GUARD(&s->rq_lock) { |
| 1115 | rq = s->rq; |
| 1116 | s->rq = NULL; |
| 1117 | } |
| 1118 | |
| 1119 | while (rq) { |
| 1120 | VirtIOBlockReq *next = rq->next; |
| 1121 | uint16_t idx = virtio_get_queue_index(rq->vq); |
| 1122 | |
| 1123 | /* Only num_queues vqs were created so vq_rq[idx] is within bounds */ |
| 1124 | assert(idx < num_queues); |
| 1125 | rq->next = vq_rq[idx]; |
| 1126 | vq_rq[idx] = rq; |
| 1127 | rq = next; |
| 1128 | } |
| 1129 | |
| 1130 | /* Schedule a BH to submit the requests in each vq's AioContext */ |
| 1131 | for (uint16_t i = 0; i < num_queues; i++) { |
| 1132 | if (!vq_rq[i]) { |
| 1133 | continue; |
| 1134 | } |
| 1135 | |
| 1136 | /* Paired with dec in virtio_blk_dma_restart_bh() */ |
| 1137 | blk_inc_in_flight(s->conf.conf.blk); |
| 1138 | |
| 1139 | aio_bh_schedule_oneshot(s->vq_aio_context[i], |
| 1140 | virtio_blk_dma_restart_bh, |
| 1141 | vq_rq[i]); |
| 1142 | } |
| 1143 | } |
| 1144 | |
| 1145 | static void virtio_blk_reset(VirtIODevice *vdev) |
| 1146 | { |
| 1147 | VirtIOBlock *s = VIRTIO_BLK(vdev); |
| 1148 | VirtIOBlockReq *req; |
| 1149 | |
| 1150 | /* Dataplane has stopped... */ |
| 1151 | assert(!s->ioeventfd_started); |
| 1152 | |
| 1153 | /* ...but requests may still be in flight. */ |
| 1154 | blk_drain(s->blk); |
| 1155 | |
| 1156 | /* We drop queued requests after blk_drain() because blk_drain() itself can |
| 1157 | * produce them. */ |
| 1158 | WITH_QEMU_LOCK_GUARD(&s->rq_lock) { |
| 1159 | while (s->rq) { |
| 1160 | req = s->rq; |
| 1161 | s->rq = req->next; |
| 1162 | |
| 1163 | /* No other threads can access req->vq here */ |
| 1164 | virtqueue_detach_element(req->vq, &req->elem, 0); |
| 1165 | |
| 1166 | g_free(req); |
| 1167 | } |
| 1168 | } |
| 1169 | |
| 1170 | blk_set_enable_write_cache(s->blk, s->original_wce); |
| 1171 | } |
| 1172 | |
| 1173 | /* coalesce internal state, copy to pci i/o region 0 |
| 1174 | */ |
| 1175 | static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) |
| 1176 | { |
| 1177 | VirtIOBlock *s = VIRTIO_BLK(vdev); |
| 1178 | BlockConf *conf = &s->conf.conf; |
| 1179 | BlockDriverState *bs = blk_bs(s->blk); |
| 1180 | struct virtio_blk_config blkcfg; |
| 1181 | uint64_t capacity; |
| 1182 | int64_t length; |
| 1183 | int blk_size = conf->logical_block_size; |
| 1184 | |
| 1185 | blk_get_geometry(s->blk, &capacity); |
| 1186 | memset(&blkcfg, 0, sizeof(blkcfg)); |
| 1187 | virtio_stq_p(vdev, &blkcfg.capacity, capacity); |
| 1188 | virtio_stl_p(vdev, &blkcfg.seg_max, |
| 1189 | s->conf.seg_max_adjust ? s->conf.queue_size - 2 : 128 - 2); |
| 1190 | virtio_stw_p(vdev, &blkcfg.geometry.cylinders, conf->cyls); |
| 1191 | virtio_stl_p(vdev, &blkcfg.blk_size, blk_size); |
| 1192 | virtio_stw_p(vdev, &blkcfg.min_io_size, conf->min_io_size / blk_size); |
| 1193 | virtio_stl_p(vdev, &blkcfg.opt_io_size, conf->opt_io_size / blk_size); |
| 1194 | blkcfg.geometry.heads = conf->heads; |
| 1195 | /* |
| 1196 | * We must ensure that the block device capacity is a multiple of |
| 1197 | * the logical block size. If that is not the case, let's use |
| 1198 | * sector_mask to adopt the geometry to have a correct picture. |
| 1199 | * For those devices where the capacity is ok for the given geometry |
| 1200 | * we don't touch the sector value of the geometry, since some devices |
| 1201 | * (like s390 dasd) need a specific value. Here the capacity is already |
| 1202 | * cyls*heads*secs*blk_size and the sector value is not block size |
| 1203 | * divided by 512 - instead it is the amount of blk_size blocks |
| 1204 | * per track (cylinder). |
| 1205 | */ |
| 1206 | length = blk_getlength(s->blk); |
| 1207 | if (length > 0 && length / conf->heads / conf->secs % blk_size) { |
| 1208 | blkcfg.geometry.sectors = conf->secs & ~s->sector_mask; |
| 1209 | } else { |
| 1210 | blkcfg.geometry.sectors = conf->secs; |
| 1211 | } |
| 1212 | blkcfg.size_max = 0; |
| 1213 | blkcfg.physical_block_exp = get_physical_block_exp(conf); |
| 1214 | blkcfg.alignment_offset = 0; |
| 1215 | blkcfg.wce = blk_enable_write_cache(s->blk); |
| 1216 | virtio_stw_p(vdev, &blkcfg.num_queues, s->conf.num_queues); |
| 1217 | if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD)) { |
| 1218 | uint32_t discard_granularity = conf->discard_granularity; |
| 1219 | if (discard_granularity == -1 || !s->conf.report_discard_granularity) { |
| 1220 | discard_granularity = blk_size; |
| 1221 | } |
| 1222 | virtio_stl_p(vdev, &blkcfg.max_discard_sectors, |
| 1223 | s->conf.max_discard_sectors); |
| 1224 | virtio_stl_p(vdev, &blkcfg.discard_sector_alignment, |
| 1225 | discard_granularity >> BDRV_SECTOR_BITS); |
| 1226 | /* |
| 1227 | * We support only one segment per request since multiple segments |
| 1228 | * are not widely used and there are no userspace APIs that allow |
| 1229 | * applications to submit multiple segments in a single call. |
| 1230 | */ |
| 1231 | virtio_stl_p(vdev, &blkcfg.max_discard_seg, 1); |
| 1232 | } |
| 1233 | if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES)) { |
| 1234 | virtio_stl_p(vdev, &blkcfg.max_write_zeroes_sectors, |
| 1235 | s->conf.max_write_zeroes_sectors); |
| 1236 | blkcfg.write_zeroes_may_unmap = 1; |
| 1237 | virtio_stl_p(vdev, &blkcfg.max_write_zeroes_seg, 1); |
| 1238 | } |
| 1239 | if (bs->bl.zoned != BLK_Z_NONE) { |
| 1240 | switch (bs->bl.zoned) { |
| 1241 | case BLK_Z_HM: |
| 1242 | blkcfg.zoned.model = VIRTIO_BLK_Z_HM; |
| 1243 | break; |
| 1244 | case BLK_Z_HA: |
| 1245 | blkcfg.zoned.model = VIRTIO_BLK_Z_HA; |
| 1246 | break; |
| 1247 | default: |
| 1248 | g_assert_not_reached(); |
| 1249 | } |
| 1250 | |
| 1251 | virtio_stl_p(vdev, &blkcfg.zoned.zone_sectors, |
| 1252 | bs->bl.zone_size / 512); |
| 1253 | virtio_stl_p(vdev, &blkcfg.zoned.max_active_zones, |
| 1254 | bs->bl.max_active_zones); |
| 1255 | virtio_stl_p(vdev, &blkcfg.zoned.max_open_zones, |
| 1256 | bs->bl.max_open_zones); |
| 1257 | virtio_stl_p(vdev, &blkcfg.zoned.write_granularity, blk_size); |
| 1258 | virtio_stl_p(vdev, &blkcfg.zoned.max_append_sectors, |
| 1259 | bs->bl.max_append_sectors); |
| 1260 | } else { |
| 1261 | blkcfg.zoned.model = VIRTIO_BLK_Z_NONE; |
| 1262 | } |
| 1263 | memcpy(config, &blkcfg, s->config_size); |
| 1264 | } |
| 1265 | |
| 1266 | static void virtio_blk_set_config(VirtIODevice *vdev, const uint8_t *config) |
| 1267 | { |
| 1268 | VirtIOBlock *s = VIRTIO_BLK(vdev); |
| 1269 | struct virtio_blk_config blkcfg; |
| 1270 | |
| 1271 | memcpy(&blkcfg, config, s->config_size); |
| 1272 | |
| 1273 | blk_set_enable_write_cache(s->blk, blkcfg.wce != 0); |
| 1274 | } |
| 1275 | |
| 1276 | static uint64_t virtio_blk_get_features(VirtIODevice *vdev, uint64_t features, |
| 1277 | Error **errp) |
| 1278 | { |
| 1279 | VirtIOBlock *s = VIRTIO_BLK(vdev); |
| 1280 | |
| 1281 | /* Firstly sync all virtio-blk possible supported features */ |
| 1282 | features |= s->host_features; |
| 1283 | |
| 1284 | virtio_add_feature(&features, VIRTIO_BLK_F_SEG_MAX); |
| 1285 | virtio_add_feature(&features, VIRTIO_BLK_F_GEOMETRY); |
| 1286 | virtio_add_feature(&features, VIRTIO_BLK_F_TOPOLOGY); |
| 1287 | virtio_add_feature(&features, VIRTIO_BLK_F_BLK_SIZE); |
| 1288 | if (!virtio_has_feature(features, VIRTIO_F_VERSION_1)) { |
| 1289 | virtio_clear_feature(&features, VIRTIO_F_ANY_LAYOUT); |
| 1290 | /* Added for historical reasons, removing it could break migration. */ |
| 1291 | virtio_add_feature(&features, VIRTIO_BLK_F_SCSI); |
| 1292 | } |
| 1293 | |
| 1294 | if (blk_enable_write_cache(s->blk) || |
| 1295 | (s->conf.x_enable_wce_if_config_wce && |
| 1296 | virtio_has_feature(features, VIRTIO_BLK_F_CONFIG_WCE))) { |
| 1297 | virtio_add_feature(&features, VIRTIO_BLK_F_WCE); |
| 1298 | } |
| 1299 | if (!blk_is_writable(s->blk)) { |
| 1300 | virtio_add_feature(&features, VIRTIO_BLK_F_RO); |
| 1301 | } |
| 1302 | if (s->conf.num_queues > 1) { |
| 1303 | virtio_add_feature(&features, VIRTIO_BLK_F_MQ); |
| 1304 | } |
| 1305 | |
| 1306 | return features; |
| 1307 | } |
| 1308 | |
| 1309 | static int virtio_blk_set_status(VirtIODevice *vdev, uint8_t status) |
| 1310 | { |
| 1311 | VirtIOBlock *s = VIRTIO_BLK(vdev); |
| 1312 | |
| 1313 | if (!(status & (VIRTIO_CONFIG_S_DRIVER | VIRTIO_CONFIG_S_DRIVER_OK))) { |
| 1314 | assert(!s->ioeventfd_started); |
| 1315 | } |
| 1316 | |
| 1317 | if (!(status & VIRTIO_CONFIG_S_DRIVER_OK)) { |
| 1318 | return 0; |
| 1319 | } |
| 1320 | |
| 1321 | /* A guest that supports VIRTIO_BLK_F_CONFIG_WCE must be able to send |
| 1322 | * cache flushes. Thus, the "auto writethrough" behavior is never |
| 1323 | * necessary for guests that support the VIRTIO_BLK_F_CONFIG_WCE feature. |
| 1324 | * Leaving it enabled would break the following sequence: |
| 1325 | * |
| 1326 | * Guest started with "-drive cache=writethrough" |
| 1327 | * Guest sets status to 0 |
| 1328 | * Guest sets DRIVER bit in status field |
| 1329 | * Guest reads host features (WCE=0, CONFIG_WCE=1) |
| 1330 | * Guest writes guest features (WCE=0, CONFIG_WCE=1) |
| 1331 | * Guest writes 1 to the WCE configuration field (writeback mode) |
| 1332 | * Guest sets DRIVER_OK bit in status field |
| 1333 | * |
| 1334 | * s->blk would erroneously be placed in writethrough mode. |
| 1335 | */ |
| 1336 | if (!virtio_vdev_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) { |
| 1337 | blk_set_enable_write_cache(s->blk, |
| 1338 | virtio_vdev_has_feature(vdev, |
| 1339 | VIRTIO_BLK_F_WCE)); |
| 1340 | } |
| 1341 | return 0; |
| 1342 | } |
| 1343 | |
| 1344 | static void virtio_blk_save_device(VirtIODevice *vdev, QEMUFile *f) |
| 1345 | { |
| 1346 | VirtIOBlock *s = VIRTIO_BLK(vdev); |
| 1347 | |
| 1348 | WITH_QEMU_LOCK_GUARD(&s->rq_lock) { |
| 1349 | VirtIOBlockReq *req = s->rq; |
| 1350 | |
| 1351 | while (req) { |
| 1352 | qemu_put_sbyte(f, 1); |
| 1353 | |
| 1354 | if (s->conf.num_queues > 1) { |
| 1355 | qemu_put_be32(f, virtio_get_queue_index(req->vq)); |
| 1356 | } |
| 1357 | |
| 1358 | qemu_put_virtqueue_element(vdev, f, &req->elem); |
| 1359 | req = req->next; |
| 1360 | } |
| 1361 | } |
| 1362 | |
| 1363 | qemu_put_sbyte(f, 0); |
| 1364 | } |
| 1365 | |
| 1366 | static int virtio_blk_load_device(VirtIODevice *vdev, QEMUFile *f, |
| 1367 | int version_id) |
| 1368 | { |
| 1369 | VirtIOBlock *s = VIRTIO_BLK(vdev); |
| 1370 | |
| 1371 | while (qemu_get_sbyte(f)) { |
| 1372 | unsigned nvqs = s->conf.num_queues; |
| 1373 | unsigned vq_idx = 0; |
| 1374 | VirtIOBlockReq *req; |
| 1375 | |
| 1376 | if (nvqs > 1) { |
| 1377 | vq_idx = qemu_get_be32(f); |
| 1378 | |
| 1379 | if (vq_idx >= nvqs) { |
| 1380 | error_report("Invalid virtqueue index in request list: %#x", |
| 1381 | vq_idx); |
| 1382 | return -EINVAL; |
| 1383 | } |
| 1384 | } |
| 1385 | |
| 1386 | req = qemu_get_virtqueue_element(vdev, f, sizeof(VirtIOBlockReq)); |
| 1387 | virtio_blk_init_request(s, virtio_get_queue(vdev, vq_idx), req); |
| 1388 | |
| 1389 | WITH_QEMU_LOCK_GUARD(&s->rq_lock) { |
| 1390 | req->next = s->rq; |
| 1391 | s->rq = req; |
| 1392 | } |
| 1393 | } |
| 1394 | |
| 1395 | return 0; |
| 1396 | } |
| 1397 | |
| 1398 | static void virtio_resize_cb(void *opaque) |
| 1399 | { |
| 1400 | VirtIODevice *vdev = opaque; |
| 1401 | |
| 1402 | assert(qemu_get_current_aio_context() == qemu_get_aio_context()); |
| 1403 | virtio_notify_config(vdev); |
| 1404 | } |
| 1405 | |
| 1406 | static void virtio_blk_resize(void *opaque) |
| 1407 | { |
| 1408 | VirtIODevice *vdev = VIRTIO_DEVICE(opaque); |
| 1409 | |
| 1410 | /* |
| 1411 | * virtio_notify_config() needs to acquire the BQL, |
| 1412 | * so it can't be called from an iothread. Instead, schedule |
| 1413 | * it to be run in the main context BH. |
| 1414 | */ |
| 1415 | aio_bh_schedule_oneshot(qemu_get_aio_context(), virtio_resize_cb, vdev); |
| 1416 | } |
| 1417 | |
| 1418 | static void virtio_blk_ioeventfd_detach(VirtIOBlock *s) |
| 1419 | { |
| 1420 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 1421 | |
| 1422 | for (uint16_t i = 0; i < s->conf.num_queues; i++) { |
| 1423 | VirtQueue *vq = virtio_get_queue(vdev, i); |
| 1424 | virtio_queue_aio_detach_host_notifier(vq, s->vq_aio_context[i]); |
| 1425 | } |
| 1426 | } |
| 1427 | |
| 1428 | static void virtio_blk_ioeventfd_attach(VirtIOBlock *s) |
| 1429 | { |
| 1430 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 1431 | |
| 1432 | for (uint16_t i = 0; i < s->conf.num_queues; i++) { |
| 1433 | VirtQueue *vq = virtio_get_queue(vdev, i); |
| 1434 | virtio_queue_aio_attach_host_notifier(vq, s->vq_aio_context[i]); |
| 1435 | } |
| 1436 | } |
| 1437 | |
| 1438 | /* Suspend virtqueue ioeventfd processing during drain */ |
| 1439 | static void virtio_blk_drained_begin(void *opaque) |
| 1440 | { |
| 1441 | VirtIOBlock *s = opaque; |
| 1442 | |
| 1443 | if (s->ioeventfd_started) { |
| 1444 | virtio_blk_ioeventfd_detach(s); |
| 1445 | } |
| 1446 | } |
| 1447 | |
| 1448 | /* Resume virtqueue ioeventfd processing after drain */ |
| 1449 | static void virtio_blk_drained_end(void *opaque) |
| 1450 | { |
| 1451 | VirtIOBlock *s = opaque; |
| 1452 | |
| 1453 | if (s->ioeventfd_started) { |
| 1454 | virtio_blk_ioeventfd_attach(s); |
| 1455 | } |
| 1456 | } |
| 1457 | |
| 1458 | static const BlockDevOps virtio_block_ops = { |
| 1459 | .resize_cb = virtio_blk_resize, |
| 1460 | .drained_begin = virtio_blk_drained_begin, |
| 1461 | .drained_end = virtio_blk_drained_end, |
| 1462 | }; |
| 1463 | |
| 1464 | /* Context: BQL held */ |
| 1465 | static bool virtio_blk_vq_aio_context_init(VirtIOBlock *s, Error **errp) |
| 1466 | { |
| 1467 | ERRP_GUARD(); |
| 1468 | VirtIODevice *vdev = VIRTIO_DEVICE(s); |
| 1469 | VirtIOBlkConf *conf = &s->conf; |
| 1470 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); |
| 1471 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 1472 | |
| 1473 | if (conf->iothread && conf->iothread_vq_mapping_list) { |
| 1474 | error_setg(errp, |
| 1475 | "iothread and iothread-vq-mapping properties cannot be set " |
| 1476 | "at the same time"); |
| 1477 | return false; |
| 1478 | } |
| 1479 | |
| 1480 | if (conf->iothread || conf->iothread_vq_mapping_list) { |
| 1481 | if (!k->set_guest_notifiers || !k->ioeventfd_assign) { |
| 1482 | error_setg(errp, |
| 1483 | "device is incompatible with iothread " |
| 1484 | "(transport does not support notifiers)"); |
| 1485 | return false; |
| 1486 | } |
| 1487 | if (!virtio_device_ioeventfd_enabled(vdev)) { |
| 1488 | error_setg(errp, "ioeventfd is required for iothread"); |
| 1489 | return false; |
| 1490 | } |
| 1491 | } |
| 1492 | |
| 1493 | s->vq_aio_context = g_new(AioContext *, conf->num_queues); |
| 1494 | |
| 1495 | if (conf->iothread_vq_mapping_list) { |
| 1496 | if (!iothread_vq_mapping_apply(conf->iothread_vq_mapping_list, |
| 1497 | s->vq_aio_context, |
| 1498 | conf->num_queues, |
| 1499 | errp)) { |
| 1500 | g_free(s->vq_aio_context); |
| 1501 | s->vq_aio_context = NULL; |
| 1502 | return false; |
| 1503 | } |
| 1504 | } else if (conf->iothread) { |
| 1505 | AioContext *ctx = iothread_get_aio_context(conf->iothread); |
| 1506 | for (unsigned i = 0; i < conf->num_queues; i++) { |
| 1507 | s->vq_aio_context[i] = ctx; |
| 1508 | } |
| 1509 | |
| 1510 | /* Released in virtio_blk_vq_aio_context_cleanup() */ |
| 1511 | object_ref(OBJECT(conf->iothread)); |
| 1512 | } else { |
| 1513 | AioContext *ctx = qemu_get_aio_context(); |
| 1514 | for (unsigned i = 0; i < conf->num_queues; i++) { |
| 1515 | s->vq_aio_context[i] = ctx; |
| 1516 | } |
| 1517 | } |
| 1518 | |
| 1519 | return true; |
| 1520 | } |
| 1521 | |
| 1522 | /* Context: BQL held */ |
| 1523 | static void virtio_blk_vq_aio_context_cleanup(VirtIOBlock *s) |
| 1524 | { |
| 1525 | VirtIOBlkConf *conf = &s->conf; |
| 1526 | |
| 1527 | assert(!s->ioeventfd_started); |
| 1528 | |
| 1529 | if (conf->iothread_vq_mapping_list) { |
| 1530 | iothread_vq_mapping_cleanup(conf->iothread_vq_mapping_list); |
| 1531 | } |
| 1532 | |
| 1533 | if (conf->iothread) { |
| 1534 | object_unref(OBJECT(conf->iothread)); |
| 1535 | } |
| 1536 | |
| 1537 | g_free(s->vq_aio_context); |
| 1538 | s->vq_aio_context = NULL; |
| 1539 | } |
| 1540 | |
| 1541 | /* Context: BQL held */ |
| 1542 | static int virtio_blk_start_ioeventfd(VirtIODevice *vdev) |
| 1543 | { |
| 1544 | VirtIOBlock *s = VIRTIO_BLK(vdev); |
| 1545 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s))); |
| 1546 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 1547 | unsigned i; |
| 1548 | unsigned nvqs = s->conf.num_queues; |
| 1549 | Error *local_err = NULL; |
| 1550 | int r; |
| 1551 | |
| 1552 | if (s->ioeventfd_started || s->ioeventfd_starting) { |
| 1553 | return 0; |
| 1554 | } |
| 1555 | |
| 1556 | s->ioeventfd_starting = true; |
| 1557 | |
| 1558 | /* Set up guest notifier (irq) */ |
| 1559 | r = k->set_guest_notifiers(qbus->parent, nvqs, true); |
| 1560 | if (r != 0) { |
| 1561 | error_report("virtio-blk failed to set guest notifier (%d), " |
| 1562 | "ensure -accel kvm is set.", r); |
| 1563 | goto fail_guest_notifiers; |
| 1564 | } |
| 1565 | |
| 1566 | /* |
| 1567 | * Batch all the host notifiers in a single transaction to avoid |
| 1568 | * quadratic time complexity in address_space_update_ioeventfds(). |
| 1569 | */ |
| 1570 | memory_region_transaction_begin(); |
| 1571 | |
| 1572 | /* Set up virtqueue notify */ |
| 1573 | for (i = 0; i < nvqs; i++) { |
| 1574 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, true); |
| 1575 | if (r != 0) { |
| 1576 | int j = i; |
| 1577 | |
| 1578 | fprintf(stderr, "virtio-blk failed to set host notifier (%d)\n", r); |
| 1579 | while (i--) { |
| 1580 | virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false); |
| 1581 | } |
| 1582 | |
| 1583 | /* |
| 1584 | * The transaction expects the ioeventfds to be open when it |
| 1585 | * commits. Do it now, before the cleanup loop. |
| 1586 | */ |
| 1587 | memory_region_transaction_commit(); |
| 1588 | |
| 1589 | while (j--) { |
| 1590 | virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), j); |
| 1591 | } |
| 1592 | goto fail_host_notifiers; |
| 1593 | } |
| 1594 | } |
| 1595 | |
| 1596 | memory_region_transaction_commit(); |
| 1597 | |
| 1598 | /* |
| 1599 | * Try to change the AioContext so that block jobs and other operations can |
| 1600 | * co-locate their activity in the same AioContext. If it fails, nevermind. |
| 1601 | */ |
| 1602 | assert(nvqs > 0); /* enforced during ->realize() */ |
| 1603 | r = blk_set_aio_context(s->conf.conf.blk, s->vq_aio_context[0], |
| 1604 | &local_err); |
| 1605 | if (r < 0) { |
| 1606 | warn_report_err(local_err); |
| 1607 | } |
| 1608 | |
| 1609 | /* |
| 1610 | * These fields must be visible to the IOThread when it processes the |
| 1611 | * virtqueue, otherwise it will think ioeventfd has not started yet. |
| 1612 | * |
| 1613 | * Make sure ->ioeventfd_started is false when blk_set_aio_context() is |
| 1614 | * called above so that draining does not cause the host notifier to be |
| 1615 | * detached/attached prematurely. |
| 1616 | */ |
| 1617 | s->ioeventfd_starting = false; |
| 1618 | s->ioeventfd_started = true; |
| 1619 | smp_wmb(); /* paired with aio_notify_accept() on the read side */ |
| 1620 | |
| 1621 | /* |
| 1622 | * Get this show started by hooking up our callbacks. If drained now, |
| 1623 | * virtio_blk_drained_end() will do this later. |
| 1624 | * Attaching the notifier also kicks the virtqueues, processing any requests |
| 1625 | * they may already have. |
| 1626 | */ |
| 1627 | if (!blk_in_drain(s->conf.conf.blk)) { |
| 1628 | virtio_blk_ioeventfd_attach(s); |
| 1629 | } |
| 1630 | return 0; |
| 1631 | |
| 1632 | fail_host_notifiers: |
| 1633 | k->set_guest_notifiers(qbus->parent, nvqs, false); |
| 1634 | fail_guest_notifiers: |
| 1635 | s->ioeventfd_disabled = true; |
| 1636 | s->ioeventfd_starting = false; |
| 1637 | return -ENOSYS; |
| 1638 | } |
| 1639 | |
| 1640 | /* Stop notifications for new requests from guest. |
| 1641 | * |
| 1642 | * Context: BH in IOThread |
| 1643 | */ |
| 1644 | static void virtio_blk_ioeventfd_stop_vq_bh(void *opaque) |
| 1645 | { |
| 1646 | VirtQueue *vq = opaque; |
| 1647 | EventNotifier *host_notifier = virtio_queue_get_host_notifier(vq); |
| 1648 | |
| 1649 | virtio_queue_aio_detach_host_notifier(vq, qemu_get_current_aio_context()); |
| 1650 | |
| 1651 | /* |
| 1652 | * Test and clear notifier after disabling event, in case poll callback |
| 1653 | * didn't have time to run. |
| 1654 | */ |
| 1655 | virtio_queue_host_notifier_read(host_notifier); |
| 1656 | } |
| 1657 | |
| 1658 | /* Context: BQL held */ |
| 1659 | static void virtio_blk_stop_ioeventfd(VirtIODevice *vdev) |
| 1660 | { |
| 1661 | VirtIOBlock *s = VIRTIO_BLK(vdev); |
| 1662 | BusState *qbus = qdev_get_parent_bus(DEVICE(s)); |
| 1663 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); |
| 1664 | unsigned i; |
| 1665 | unsigned nvqs = s->conf.num_queues; |
| 1666 | |
| 1667 | if (!s->ioeventfd_started || s->ioeventfd_stopping) { |
| 1668 | return; |
| 1669 | } |
| 1670 | |
| 1671 | /* Better luck next time. */ |
| 1672 | if (s->ioeventfd_disabled) { |
| 1673 | s->ioeventfd_disabled = false; |
| 1674 | s->ioeventfd_started = false; |
| 1675 | return; |
| 1676 | } |
| 1677 | s->ioeventfd_stopping = true; |
| 1678 | |
| 1679 | if (!blk_in_drain(s->conf.conf.blk)) { |
| 1680 | for (i = 0; i < nvqs; i++) { |
| 1681 | VirtQueue *vq = virtio_get_queue(vdev, i); |
| 1682 | AioContext *ctx = s->vq_aio_context[i]; |
| 1683 | |
| 1684 | aio_wait_bh_oneshot(ctx, virtio_blk_ioeventfd_stop_vq_bh, vq); |
| 1685 | } |
| 1686 | } |
| 1687 | |
| 1688 | /* |
| 1689 | * Batch all the host notifiers in a single transaction to avoid |
| 1690 | * quadratic time complexity in address_space_update_ioeventfds(). |
| 1691 | */ |
| 1692 | memory_region_transaction_begin(); |
| 1693 | |
| 1694 | for (i = 0; i < nvqs; i++) { |
| 1695 | virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), i, false); |
| 1696 | } |
| 1697 | |
| 1698 | /* |
| 1699 | * The transaction expects the ioeventfds to be open when it |
| 1700 | * commits. Do it now, before the cleanup loop. |
| 1701 | */ |
| 1702 | memory_region_transaction_commit(); |
| 1703 | |
| 1704 | for (i = 0; i < nvqs; i++) { |
| 1705 | virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), i); |
| 1706 | } |
| 1707 | |
| 1708 | /* |
| 1709 | * Set ->ioeventfd_started to false before draining so that host notifiers |
| 1710 | * are not detached/attached anymore. |
| 1711 | */ |
| 1712 | s->ioeventfd_started = false; |
| 1713 | |
| 1714 | /* Wait for virtio_blk_dma_restart_bh() and in flight I/O to complete */ |
| 1715 | blk_drain(s->conf.conf.blk); |
| 1716 | |
| 1717 | /* |
| 1718 | * Try to switch bs back to the QEMU main loop. If other users keep the |
| 1719 | * BlockBackend in the iothread, that's ok |
| 1720 | */ |
| 1721 | blk_set_aio_context(s->conf.conf.blk, qemu_get_aio_context(), NULL); |
| 1722 | |
| 1723 | /* Clean up guest notifier (irq) */ |
| 1724 | k->set_guest_notifiers(qbus->parent, nvqs, false); |
| 1725 | |
| 1726 | s->ioeventfd_stopping = false; |
| 1727 | } |
| 1728 | |
| 1729 | static void virtio_blk_device_realize(DeviceState *dev, Error **errp) |
| 1730 | { |
| 1731 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 1732 | VirtIOBlock *s = VIRTIO_BLK(dev); |
| 1733 | VirtIOBlkConf *conf = &s->conf; |
| 1734 | BlockDriverState *bs; |
| 1735 | Error *err = NULL; |
| 1736 | unsigned i; |
| 1737 | |
| 1738 | if (!conf->conf.blk) { |
| 1739 | error_setg(errp, "drive property not set"); |
| 1740 | return; |
| 1741 | } |
| 1742 | if (!blk_is_inserted(conf->conf.blk)) { |
| 1743 | error_setg(errp, "Device needs media, but drive is empty"); |
| 1744 | return; |
| 1745 | } |
| 1746 | if (conf->num_queues == VIRTIO_BLK_AUTO_NUM_QUEUES) { |
| 1747 | conf->num_queues = 1; |
| 1748 | } |
| 1749 | if (!conf->num_queues) { |
| 1750 | error_setg(errp, "num-queues property must be larger than 0"); |
| 1751 | return; |
| 1752 | } |
| 1753 | if (conf->queue_size <= 2) { |
| 1754 | error_setg(errp, "invalid queue-size property (%" PRIu16 "), " |
| 1755 | "must be > 2", conf->queue_size); |
| 1756 | return; |
| 1757 | } |
| 1758 | if (!is_power_of_2(conf->queue_size) || |
| 1759 | conf->queue_size > VIRTQUEUE_MAX_SIZE) { |
| 1760 | error_setg(errp, "invalid queue-size property (%" PRIu16 "), " |
| 1761 | "must be a power of 2 (max %d)", |
| 1762 | conf->queue_size, VIRTQUEUE_MAX_SIZE); |
| 1763 | return; |
| 1764 | } |
| 1765 | |
| 1766 | if (!blkconf_apply_backend_options(&conf->conf, |
| 1767 | !blk_supports_write_perm(conf->conf.blk), |
| 1768 | true, errp)) { |
| 1769 | return; |
| 1770 | } |
| 1771 | s->original_wce = blk_enable_write_cache(conf->conf.blk); |
| 1772 | if (!blkconf_geometry(&conf->conf, NULL, 65535, 255, 255, errp)) { |
| 1773 | return; |
| 1774 | } |
| 1775 | |
| 1776 | if (!blkconf_blocksizes(&conf->conf, errp)) { |
| 1777 | return; |
| 1778 | } |
| 1779 | |
| 1780 | bs = blk_bs(conf->conf.blk); |
| 1781 | if (bs->bl.zoned != BLK_Z_NONE) { |
| 1782 | virtio_add_feature(&s->host_features, VIRTIO_BLK_F_ZONED); |
| 1783 | if (bs->bl.zoned == BLK_Z_HM) { |
| 1784 | virtio_clear_feature(&s->host_features, VIRTIO_BLK_F_DISCARD); |
| 1785 | } |
| 1786 | } |
| 1787 | |
| 1788 | if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_DISCARD) && |
| 1789 | (!conf->max_discard_sectors || |
| 1790 | conf->max_discard_sectors > BDRV_REQUEST_MAX_SECTORS)) { |
| 1791 | error_setg(errp, "invalid max-discard-sectors property (%" PRIu32 ")" |
| 1792 | ", must be between 1 and %d", |
| 1793 | conf->max_discard_sectors, (int)BDRV_REQUEST_MAX_SECTORS); |
| 1794 | return; |
| 1795 | } |
| 1796 | |
| 1797 | if (virtio_has_feature(s->host_features, VIRTIO_BLK_F_WRITE_ZEROES) && |
| 1798 | (!conf->max_write_zeroes_sectors || |
| 1799 | conf->max_write_zeroes_sectors > BDRV_REQUEST_MAX_SECTORS)) { |
| 1800 | error_setg(errp, "invalid max-write-zeroes-sectors property (%" PRIu32 |
| 1801 | "), must be between 1 and %d", |
| 1802 | conf->max_write_zeroes_sectors, |
| 1803 | (int)BDRV_REQUEST_MAX_SECTORS); |
| 1804 | return; |
| 1805 | } |
| 1806 | |
| 1807 | s->config_size = virtio_get_config_size(&virtio_blk_cfg_size_params, |
| 1808 | s->host_features); |
| 1809 | virtio_init(vdev, VIRTIO_ID_BLOCK, s->config_size); |
| 1810 | |
| 1811 | qemu_mutex_init(&s->rq_lock); |
| 1812 | |
| 1813 | s->blk = conf->conf.blk; |
| 1814 | s->rq = NULL; |
| 1815 | s->sector_mask = (s->conf.conf.logical_block_size / BDRV_SECTOR_SIZE) - 1; |
| 1816 | |
| 1817 | for (i = 0; i < conf->num_queues; i++) { |
| 1818 | virtio_add_queue(vdev, conf->queue_size, virtio_blk_handle_output); |
| 1819 | } |
| 1820 | qemu_coroutine_inc_pool_size(conf->num_queues * conf->queue_size / 2); |
| 1821 | |
| 1822 | /* Don't start ioeventfd if transport does not support notifiers. */ |
| 1823 | if (!virtio_device_ioeventfd_enabled(vdev)) { |
| 1824 | s->ioeventfd_disabled = true; |
| 1825 | } |
| 1826 | |
| 1827 | virtio_blk_vq_aio_context_init(s, &err); |
| 1828 | if (err != NULL) { |
| 1829 | error_propagate(errp, err); |
| 1830 | for (i = 0; i < conf->num_queues; i++) { |
| 1831 | virtio_del_queue(vdev, i); |
| 1832 | } |
| 1833 | virtio_cleanup(vdev); |
| 1834 | return; |
| 1835 | } |
| 1836 | |
| 1837 | /* |
| 1838 | * This must be after virtio_init() so virtio_blk_dma_restart_cb() gets |
| 1839 | * called after ->start_ioeventfd() has already set blk's AioContext. |
| 1840 | */ |
| 1841 | s->change = |
| 1842 | qdev_add_vm_change_state_handler(dev, virtio_blk_dma_restart_cb, NULL, s); |
| 1843 | |
| 1844 | blk_ram_registrar_init(&s->blk_ram_registrar, s->blk); |
| 1845 | blk_set_dev_ops(s->blk, &virtio_block_ops, s); |
| 1846 | |
| 1847 | blk_iostatus_enable(s->blk); |
| 1848 | |
| 1849 | add_boot_device_lchs(dev, "/disk@0,0", |
| 1850 | conf->conf.lcyls, |
| 1851 | conf->conf.lheads, |
| 1852 | conf->conf.lsecs); |
| 1853 | } |
| 1854 | |
| 1855 | static void virtio_blk_device_unrealize(DeviceState *dev) |
| 1856 | { |
| 1857 | VirtIODevice *vdev = VIRTIO_DEVICE(dev); |
| 1858 | VirtIOBlock *s = VIRTIO_BLK(dev); |
| 1859 | VirtIOBlkConf *conf = &s->conf; |
| 1860 | unsigned i; |
| 1861 | |
| 1862 | blk_drain(s->blk); |
| 1863 | del_boot_device_lchs(dev, "/disk@0,0"); |
| 1864 | virtio_blk_vq_aio_context_cleanup(s); |
| 1865 | for (i = 0; i < conf->num_queues; i++) { |
| 1866 | virtio_del_queue(vdev, i); |
| 1867 | } |
| 1868 | qemu_coroutine_dec_pool_size(conf->num_queues * conf->queue_size / 2); |
| 1869 | qemu_mutex_destroy(&s->rq_lock); |
| 1870 | blk_ram_registrar_destroy(&s->blk_ram_registrar); |
| 1871 | qemu_del_vm_change_state_handler(s->change); |
| 1872 | blockdev_mark_auto_del(s->blk); |
| 1873 | virtio_cleanup(vdev); |
| 1874 | } |
| 1875 | |
| 1876 | static void virtio_blk_instance_init(Object *obj) |
| 1877 | { |
| 1878 | VirtIOBlock *s = VIRTIO_BLK(obj); |
| 1879 | |
| 1880 | device_add_bootindex_property(obj, &s->conf.conf.bootindex, |
| 1881 | "bootindex", "/disk@0,0", |
| 1882 | DEVICE(obj)); |
| 1883 | } |
| 1884 | |
| 1885 | static const VMStateDescription vmstate_virtio_blk = { |
| 1886 | .name = "virtio-blk", |
| 1887 | .minimum_version_id = 2, |
| 1888 | .version_id = 2, |
| 1889 | .fields = (const VMStateField[]) { |
| 1890 | VMSTATE_VIRTIO_DEVICE, |
| 1891 | VMSTATE_END_OF_LIST() |
| 1892 | }, |
| 1893 | }; |
| 1894 | |
| 1895 | static const Property virtio_blk_properties[] = { |
| 1896 | DEFINE_BLOCK_PROPERTIES(VirtIOBlock, conf.conf), |
| 1897 | DEFINE_BLOCK_ERROR_PROPERTIES(VirtIOBlock, conf.conf), |
| 1898 | DEFINE_BLOCK_CHS_PROPERTIES(VirtIOBlock, conf.conf), |
| 1899 | DEFINE_PROP_STRING("serial", VirtIOBlock, conf.serial), |
| 1900 | DEFINE_PROP_BIT64("config-wce", VirtIOBlock, host_features, |
| 1901 | VIRTIO_BLK_F_CONFIG_WCE, true), |
| 1902 | DEFINE_PROP_BIT("request-merging", VirtIOBlock, conf.request_merging, 0, |
| 1903 | true), |
| 1904 | DEFINE_PROP_UINT16("num-queues", VirtIOBlock, conf.num_queues, |
| 1905 | VIRTIO_BLK_AUTO_NUM_QUEUES), |
| 1906 | DEFINE_PROP_UINT16("queue-size", VirtIOBlock, conf.queue_size, 256), |
| 1907 | DEFINE_PROP_BOOL("seg-max-adjust", VirtIOBlock, conf.seg_max_adjust, true), |
| 1908 | DEFINE_PROP_LINK("iothread", VirtIOBlock, conf.iothread, TYPE_IOTHREAD, |
| 1909 | IOThread *), |
| 1910 | DEFINE_PROP_IOTHREAD_VQ_MAPPING_LIST("iothread-vq-mapping", VirtIOBlock, |
| 1911 | conf.iothread_vq_mapping_list), |
| 1912 | DEFINE_PROP_BIT64("discard", VirtIOBlock, host_features, |
| 1913 | VIRTIO_BLK_F_DISCARD, true), |
| 1914 | DEFINE_PROP_BOOL("report-discard-granularity", VirtIOBlock, |
| 1915 | conf.report_discard_granularity, true), |
| 1916 | DEFINE_PROP_BIT64("write-zeroes", VirtIOBlock, host_features, |
| 1917 | VIRTIO_BLK_F_WRITE_ZEROES, true), |
| 1918 | DEFINE_PROP_UINT32("max-discard-sectors", VirtIOBlock, |
| 1919 | conf.max_discard_sectors, BDRV_REQUEST_MAX_SECTORS), |
| 1920 | DEFINE_PROP_UINT32("max-write-zeroes-sectors", VirtIOBlock, |
| 1921 | conf.max_write_zeroes_sectors, BDRV_REQUEST_MAX_SECTORS), |
| 1922 | DEFINE_PROP_BOOL("x-enable-wce-if-config-wce", VirtIOBlock, |
| 1923 | conf.x_enable_wce_if_config_wce, true), |
| 1924 | }; |
| 1925 | |
| 1926 | static void virtio_blk_class_init(ObjectClass *klass, const void *data) |
| 1927 | { |
| 1928 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 1929 | VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); |
| 1930 | |
| 1931 | device_class_set_props(dc, virtio_blk_properties); |
| 1932 | dc->vmsd = &vmstate_virtio_blk; |
| 1933 | set_bit(DEVICE_CATEGORY_STORAGE, dc->categories); |
| 1934 | vdc->realize = virtio_blk_device_realize; |
| 1935 | vdc->unrealize = virtio_blk_device_unrealize; |
| 1936 | vdc->get_config = virtio_blk_update_config; |
| 1937 | vdc->set_config = virtio_blk_set_config; |
| 1938 | vdc->get_features = virtio_blk_get_features; |
| 1939 | vdc->set_status = virtio_blk_set_status; |
| 1940 | vdc->reset = virtio_blk_reset; |
| 1941 | vdc->save = virtio_blk_save_device; |
| 1942 | vdc->load = virtio_blk_load_device; |
| 1943 | vdc->start_ioeventfd = virtio_blk_start_ioeventfd; |
| 1944 | vdc->stop_ioeventfd = virtio_blk_stop_ioeventfd; |
| 1945 | } |
| 1946 | |
| 1947 | static const TypeInfo virtio_blk_info = { |
| 1948 | .name = TYPE_VIRTIO_BLK, |
| 1949 | .parent = TYPE_VIRTIO_DEVICE, |
| 1950 | .instance_size = sizeof(VirtIOBlock), |
| 1951 | .instance_init = virtio_blk_instance_init, |
| 1952 | .class_init = virtio_blk_class_init, |
| 1953 | .class_size = sizeof(VirtIOBlkClass), |
| 1954 | }; |
| 1955 | |
| 1956 | static void virtio_register_types(void) |
| 1957 | { |
| 1958 | type_register_static(&virtio_blk_info); |
| 1959 | } |
| 1960 | |
| 1961 | type_init(virtio_register_types) |