| 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| 2 | /* |
| 3 | * libblkio BlockDriver |
| 4 | * |
| 5 | * Copyright Red Hat, Inc. |
| 6 | * |
| 7 | * Author: |
| 8 | * Stefan Hajnoczi <stefanha@redhat.com> |
| 9 | */ |
| 10 | |
| 11 | #include "qemu/osdep.h" |
| 12 | #include <blkio.h> |
| 13 | #include "block/block_int.h" |
| 14 | #include "system/memory.h" |
| 15 | #include "system/ramblock.h" |
| 16 | #include "qemu/defer-call.h" |
| 17 | #include "qapi/error.h" |
| 18 | #include "qemu/error-report.h" |
| 19 | #include "qobject/qdict.h" |
| 20 | #include "qemu/module.h" |
| 21 | #include "system/block-backend.h" |
| 22 | #include "system/memory.h" /* for ram_block_discard_disable() */ |
| 23 | |
| 24 | #include "block/block-io.h" |
| 25 | |
| 26 | /* |
| 27 | * Allocated bounce buffers are kept in a list sorted by buffer address. |
| 28 | */ |
| 29 | typedef struct BlkioBounceBuf { |
| 30 | QLIST_ENTRY(BlkioBounceBuf) next; |
| 31 | |
| 32 | /* The bounce buffer */ |
| 33 | struct iovec buf; |
| 34 | } BlkioBounceBuf; |
| 35 | |
| 36 | typedef struct { |
| 37 | /* |
| 38 | * libblkio is not thread-safe so this lock protects ->blkio and |
| 39 | * ->blkioq. |
| 40 | */ |
| 41 | QemuMutex blkio_lock; |
| 42 | struct blkio *blkio; |
| 43 | struct blkioq *blkioq; /* make this multi-queue in the future... */ |
| 44 | int completion_fd; |
| 45 | |
| 46 | /* |
| 47 | * Polling fetches the next completion into this field. |
| 48 | * |
| 49 | * No lock is necessary since only one thread calls aio_poll() and invokes |
| 50 | * fd and poll handlers. |
| 51 | */ |
| 52 | struct blkio_completion poll_completion; |
| 53 | |
| 54 | /* |
| 55 | * Protects ->bounce_pool, ->bounce_bufs, ->bounce_available. |
| 56 | * |
| 57 | * Lock ordering: ->bounce_lock before ->blkio_lock. |
| 58 | */ |
| 59 | CoMutex bounce_lock; |
| 60 | |
| 61 | /* Bounce buffer pool */ |
| 62 | struct blkio_mem_region bounce_pool; |
| 63 | |
| 64 | /* Sorted list of allocated bounce buffers */ |
| 65 | QLIST_HEAD(, BlkioBounceBuf) bounce_bufs; |
| 66 | |
| 67 | /* Queue for coroutines waiting for bounce buffer space */ |
| 68 | CoQueue bounce_available; |
| 69 | |
| 70 | /* The value of the "mem-region-alignment" property */ |
| 71 | uint64_t mem_region_alignment; |
| 72 | |
| 73 | /* Can we skip adding/deleting blkio_mem_regions? */ |
| 74 | bool needs_mem_regions; |
| 75 | |
| 76 | /* Are file descriptors necessary for blkio_mem_regions? */ |
| 77 | bool needs_mem_region_fd; |
| 78 | |
| 79 | /* Are madvise(MADV_DONTNEED)-style operations unavailable? */ |
| 80 | bool may_pin_mem_regions; |
| 81 | } BDRVBlkioState; |
| 82 | |
| 83 | /* Called with s->bounce_lock held */ |
| 84 | static int blkio_resize_bounce_pool(BDRVBlkioState *s, int64_t bytes) |
| 85 | { |
| 86 | /* There can be no allocated bounce buffers during resize */ |
| 87 | assert(QLIST_EMPTY(&s->bounce_bufs)); |
| 88 | |
| 89 | /* Pad size to reduce frequency of resize calls */ |
| 90 | bytes += 128 * 1024; |
| 91 | |
| 92 | /* Align the pool size to avoid blkio_alloc_mem_region() failure */ |
| 93 | bytes = QEMU_ALIGN_UP(bytes, s->mem_region_alignment); |
| 94 | |
| 95 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 96 | int ret; |
| 97 | |
| 98 | if (s->bounce_pool.addr) { |
| 99 | blkio_unmap_mem_region(s->blkio, &s->bounce_pool); |
| 100 | blkio_free_mem_region(s->blkio, &s->bounce_pool); |
| 101 | memset(&s->bounce_pool, 0, sizeof(s->bounce_pool)); |
| 102 | } |
| 103 | |
| 104 | /* Automatically freed when s->blkio is destroyed */ |
| 105 | ret = blkio_alloc_mem_region(s->blkio, &s->bounce_pool, bytes); |
| 106 | if (ret < 0) { |
| 107 | return ret; |
| 108 | } |
| 109 | |
| 110 | ret = blkio_map_mem_region(s->blkio, &s->bounce_pool); |
| 111 | if (ret < 0) { |
| 112 | blkio_free_mem_region(s->blkio, &s->bounce_pool); |
| 113 | memset(&s->bounce_pool, 0, sizeof(s->bounce_pool)); |
| 114 | return ret; |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | /* Called with s->bounce_lock held */ |
| 122 | static bool |
| 123 | blkio_do_alloc_bounce_buffer(BDRVBlkioState *s, BlkioBounceBuf *bounce, |
| 124 | int64_t bytes) |
| 125 | { |
| 126 | void *addr = s->bounce_pool.addr; |
| 127 | BlkioBounceBuf *cur; |
| 128 | BlkioBounceBuf *prev = NULL; |
| 129 | ptrdiff_t space; |
| 130 | |
| 131 | /* |
| 132 | * This is just a linear search over the holes between requests. An |
| 133 | * efficient allocator would be nice. |
| 134 | */ |
| 135 | QLIST_FOREACH(cur, &s->bounce_bufs, next) { |
| 136 | space = cur->buf.iov_base - addr; |
| 137 | if (bytes <= space) { |
| 138 | QLIST_INSERT_BEFORE(cur, bounce, next); |
| 139 | bounce->buf.iov_base = addr; |
| 140 | bounce->buf.iov_len = bytes; |
| 141 | return true; |
| 142 | } |
| 143 | |
| 144 | addr = cur->buf.iov_base + cur->buf.iov_len; |
| 145 | prev = cur; |
| 146 | } |
| 147 | |
| 148 | /* Is there space after the last request? */ |
| 149 | space = s->bounce_pool.addr + s->bounce_pool.len - addr; |
| 150 | if (bytes > space) { |
| 151 | return false; |
| 152 | } |
| 153 | if (prev) { |
| 154 | QLIST_INSERT_AFTER(prev, bounce, next); |
| 155 | } else { |
| 156 | QLIST_INSERT_HEAD(&s->bounce_bufs, bounce, next); |
| 157 | } |
| 158 | bounce->buf.iov_base = addr; |
| 159 | bounce->buf.iov_len = bytes; |
| 160 | return true; |
| 161 | } |
| 162 | |
| 163 | static int coroutine_fn |
| 164 | blkio_alloc_bounce_buffer(BDRVBlkioState *s, BlkioBounceBuf *bounce, |
| 165 | int64_t bytes) |
| 166 | { |
| 167 | /* |
| 168 | * Ensure fairness: first time around we join the back of the queue, |
| 169 | * subsequently we join the front so we don't lose our place. |
| 170 | */ |
| 171 | CoQueueWaitFlags wait_flags = 0; |
| 172 | |
| 173 | QEMU_LOCK_GUARD(&s->bounce_lock); |
| 174 | |
| 175 | /* Ensure fairness: don't even try if other requests are already waiting */ |
| 176 | if (!qemu_co_queue_empty(&s->bounce_available)) { |
| 177 | qemu_co_queue_wait_flags(&s->bounce_available, &s->bounce_lock, |
| 178 | wait_flags); |
| 179 | wait_flags = CO_QUEUE_WAIT_FRONT; |
| 180 | } |
| 181 | |
| 182 | while (true) { |
| 183 | if (blkio_do_alloc_bounce_buffer(s, bounce, bytes)) { |
| 184 | /* Kick the next queued request since there may be space */ |
| 185 | qemu_co_queue_next(&s->bounce_available); |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * If there are no in-flight requests then the pool was simply too |
| 191 | * small. |
| 192 | */ |
| 193 | if (QLIST_EMPTY(&s->bounce_bufs)) { |
| 194 | bool ok; |
| 195 | int ret; |
| 196 | |
| 197 | ret = blkio_resize_bounce_pool(s, bytes); |
| 198 | if (ret < 0) { |
| 199 | /* Kick the next queued request since that may fail too */ |
| 200 | qemu_co_queue_next(&s->bounce_available); |
| 201 | return ret; |
| 202 | } |
| 203 | |
| 204 | ok = blkio_do_alloc_bounce_buffer(s, bounce, bytes); |
| 205 | assert(ok); /* must have space this time */ |
| 206 | return 0; |
| 207 | } |
| 208 | |
| 209 | qemu_co_queue_wait_flags(&s->bounce_available, &s->bounce_lock, |
| 210 | wait_flags); |
| 211 | wait_flags = CO_QUEUE_WAIT_FRONT; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | static void coroutine_fn blkio_free_bounce_buffer(BDRVBlkioState *s, |
| 216 | BlkioBounceBuf *bounce) |
| 217 | { |
| 218 | QEMU_LOCK_GUARD(&s->bounce_lock); |
| 219 | |
| 220 | QLIST_REMOVE(bounce, next); |
| 221 | |
| 222 | /* Wake up waiting coroutines since space may now be available */ |
| 223 | qemu_co_queue_next(&s->bounce_available); |
| 224 | } |
| 225 | |
| 226 | /* For async to .bdrv_co_*() conversion */ |
| 227 | typedef struct { |
| 228 | Coroutine *coroutine; |
| 229 | int ret; |
| 230 | } BlkioCoData; |
| 231 | |
| 232 | static void blkio_completion_fd_read(void *opaque) |
| 233 | { |
| 234 | BlockDriverState *bs = opaque; |
| 235 | BDRVBlkioState *s = bs->opaque; |
| 236 | uint64_t val; |
| 237 | int ret; |
| 238 | |
| 239 | /* Polling may have already fetched a completion */ |
| 240 | if (s->poll_completion.user_data != NULL) { |
| 241 | BlkioCoData *cod = s->poll_completion.user_data; |
| 242 | cod->ret = s->poll_completion.ret; |
| 243 | |
| 244 | /* Clear it in case aio_co_wake() enters a nested event loop */ |
| 245 | s->poll_completion.user_data = NULL; |
| 246 | |
| 247 | aio_co_wake(cod->coroutine); |
| 248 | } |
| 249 | |
| 250 | /* Reset completion fd status */ |
| 251 | ret = read(s->completion_fd, &val, sizeof(val)); |
| 252 | |
| 253 | /* Ignore errors, there's nothing we can do */ |
| 254 | (void)ret; |
| 255 | |
| 256 | /* |
| 257 | * Reading one completion at a time makes nested event loop re-entrancy |
| 258 | * simple. Change this loop to get multiple completions in one go if it |
| 259 | * becomes a performance bottleneck. |
| 260 | */ |
| 261 | while (true) { |
| 262 | struct blkio_completion completion; |
| 263 | |
| 264 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 265 | ret = blkioq_do_io(s->blkioq, &completion, 0, 1, NULL); |
| 266 | } |
| 267 | if (ret != 1) { |
| 268 | break; |
| 269 | } |
| 270 | |
| 271 | BlkioCoData *cod = completion.user_data; |
| 272 | cod->ret = completion.ret; |
| 273 | aio_co_wake(cod->coroutine); |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | static bool blkio_completion_fd_poll(void *opaque) |
| 278 | { |
| 279 | BlockDriverState *bs = opaque; |
| 280 | BDRVBlkioState *s = bs->opaque; |
| 281 | int ret; |
| 282 | |
| 283 | /* Just in case we already fetched a completion */ |
| 284 | if (s->poll_completion.user_data != NULL) { |
| 285 | return true; |
| 286 | } |
| 287 | |
| 288 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 289 | ret = blkioq_do_io(s->blkioq, &s->poll_completion, 0, 1, NULL); |
| 290 | } |
| 291 | return ret == 1; |
| 292 | } |
| 293 | |
| 294 | static void blkio_completion_fd_poll_ready(void *opaque) |
| 295 | { |
| 296 | blkio_completion_fd_read(opaque); |
| 297 | } |
| 298 | |
| 299 | static void blkio_attach_aio_context(BlockDriverState *bs, |
| 300 | AioContext *new_context) |
| 301 | { |
| 302 | BDRVBlkioState *s = bs->opaque; |
| 303 | |
| 304 | aio_set_fd_handler(new_context, s->completion_fd, |
| 305 | blkio_completion_fd_read, NULL, |
| 306 | blkio_completion_fd_poll, |
| 307 | blkio_completion_fd_poll_ready, bs); |
| 308 | } |
| 309 | |
| 310 | static void blkio_detach_aio_context(BlockDriverState *bs) |
| 311 | { |
| 312 | BDRVBlkioState *s = bs->opaque; |
| 313 | |
| 314 | aio_set_fd_handler(bdrv_get_aio_context(bs), s->completion_fd, NULL, NULL, |
| 315 | NULL, NULL, NULL); |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | * Called by defer_call_end() or immediately if not in a deferred section. |
| 320 | * Called without blkio_lock. |
| 321 | */ |
| 322 | static void blkio_deferred_fn(void *opaque) |
| 323 | { |
| 324 | BDRVBlkioState *s = opaque; |
| 325 | |
| 326 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 327 | blkioq_do_io(s->blkioq, NULL, 0, 0, NULL); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Schedule I/O submission after enqueuing a new request. Called without |
| 333 | * blkio_lock. |
| 334 | */ |
| 335 | static void blkio_submit_io(BlockDriverState *bs) |
| 336 | { |
| 337 | BDRVBlkioState *s = bs->opaque; |
| 338 | |
| 339 | defer_call(blkio_deferred_fn, s); |
| 340 | } |
| 341 | |
| 342 | static int coroutine_fn |
| 343 | blkio_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) |
| 344 | { |
| 345 | BDRVBlkioState *s = bs->opaque; |
| 346 | BlkioCoData cod = { |
| 347 | .coroutine = qemu_coroutine_self(), |
| 348 | }; |
| 349 | |
| 350 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 351 | blkioq_discard(s->blkioq, offset, bytes, &cod, 0); |
| 352 | } |
| 353 | |
| 354 | blkio_submit_io(bs); |
| 355 | qemu_coroutine_yield(); |
| 356 | return cod.ret; |
| 357 | } |
| 358 | |
| 359 | static int coroutine_fn |
| 360 | blkio_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, |
| 361 | QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 362 | { |
| 363 | BlkioCoData cod = { |
| 364 | .coroutine = qemu_coroutine_self(), |
| 365 | }; |
| 366 | BDRVBlkioState *s = bs->opaque; |
| 367 | bool use_bounce_buffer = |
| 368 | s->needs_mem_regions && !(flags & BDRV_REQ_REGISTERED_BUF); |
| 369 | BlkioBounceBuf bounce; |
| 370 | struct iovec *iov = qiov->iov; |
| 371 | int iovcnt = qiov->niov; |
| 372 | |
| 373 | if (use_bounce_buffer) { |
| 374 | int ret = blkio_alloc_bounce_buffer(s, &bounce, bytes); |
| 375 | if (ret < 0) { |
| 376 | return ret; |
| 377 | } |
| 378 | |
| 379 | iov = &bounce.buf; |
| 380 | iovcnt = 1; |
| 381 | } |
| 382 | |
| 383 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 384 | blkioq_readv(s->blkioq, offset, iov, iovcnt, &cod, 0); |
| 385 | } |
| 386 | |
| 387 | blkio_submit_io(bs); |
| 388 | qemu_coroutine_yield(); |
| 389 | |
| 390 | if (use_bounce_buffer) { |
| 391 | if (cod.ret == 0) { |
| 392 | qemu_iovec_from_buf(qiov, 0, |
| 393 | bounce.buf.iov_base, |
| 394 | bounce.buf.iov_len); |
| 395 | } |
| 396 | |
| 397 | blkio_free_bounce_buffer(s, &bounce); |
| 398 | } |
| 399 | |
| 400 | return cod.ret; |
| 401 | } |
| 402 | |
| 403 | static int coroutine_fn blkio_co_pwritev(BlockDriverState *bs, int64_t offset, |
| 404 | int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags) |
| 405 | { |
| 406 | uint32_t blkio_flags = (flags & BDRV_REQ_FUA) ? BLKIO_REQ_FUA : 0; |
| 407 | BlkioCoData cod = { |
| 408 | .coroutine = qemu_coroutine_self(), |
| 409 | }; |
| 410 | BDRVBlkioState *s = bs->opaque; |
| 411 | bool use_bounce_buffer = |
| 412 | s->needs_mem_regions && !(flags & BDRV_REQ_REGISTERED_BUF); |
| 413 | BlkioBounceBuf bounce; |
| 414 | struct iovec *iov = qiov->iov; |
| 415 | int iovcnt = qiov->niov; |
| 416 | |
| 417 | if (use_bounce_buffer) { |
| 418 | int ret = blkio_alloc_bounce_buffer(s, &bounce, bytes); |
| 419 | if (ret < 0) { |
| 420 | return ret; |
| 421 | } |
| 422 | |
| 423 | qemu_iovec_to_buf(qiov, 0, bounce.buf.iov_base, bytes); |
| 424 | iov = &bounce.buf; |
| 425 | iovcnt = 1; |
| 426 | } |
| 427 | |
| 428 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 429 | blkioq_writev(s->blkioq, offset, iov, iovcnt, &cod, blkio_flags); |
| 430 | } |
| 431 | |
| 432 | blkio_submit_io(bs); |
| 433 | qemu_coroutine_yield(); |
| 434 | |
| 435 | if (use_bounce_buffer) { |
| 436 | blkio_free_bounce_buffer(s, &bounce); |
| 437 | } |
| 438 | |
| 439 | return cod.ret; |
| 440 | } |
| 441 | |
| 442 | static int coroutine_fn blkio_co_flush(BlockDriverState *bs) |
| 443 | { |
| 444 | BDRVBlkioState *s = bs->opaque; |
| 445 | BlkioCoData cod = { |
| 446 | .coroutine = qemu_coroutine_self(), |
| 447 | }; |
| 448 | |
| 449 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 450 | blkioq_flush(s->blkioq, &cod, 0); |
| 451 | } |
| 452 | |
| 453 | blkio_submit_io(bs); |
| 454 | qemu_coroutine_yield(); |
| 455 | return cod.ret; |
| 456 | } |
| 457 | |
| 458 | static int coroutine_fn blkio_co_pwrite_zeroes(BlockDriverState *bs, |
| 459 | int64_t offset, int64_t bytes, BdrvRequestFlags flags) |
| 460 | { |
| 461 | BDRVBlkioState *s = bs->opaque; |
| 462 | BlkioCoData cod = { |
| 463 | .coroutine = qemu_coroutine_self(), |
| 464 | }; |
| 465 | uint32_t blkio_flags = 0; |
| 466 | |
| 467 | if (flags & BDRV_REQ_FUA) { |
| 468 | blkio_flags |= BLKIO_REQ_FUA; |
| 469 | } |
| 470 | if (!(flags & BDRV_REQ_MAY_UNMAP)) { |
| 471 | blkio_flags |= BLKIO_REQ_NO_UNMAP; |
| 472 | } |
| 473 | if (flags & BDRV_REQ_NO_FALLBACK) { |
| 474 | blkio_flags |= BLKIO_REQ_NO_FALLBACK; |
| 475 | } |
| 476 | |
| 477 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 478 | blkioq_write_zeroes(s->blkioq, offset, bytes, &cod, blkio_flags); |
| 479 | } |
| 480 | |
| 481 | blkio_submit_io(bs); |
| 482 | qemu_coroutine_yield(); |
| 483 | return cod.ret; |
| 484 | } |
| 485 | |
| 486 | typedef enum { |
| 487 | BMRR_OK, |
| 488 | BMRR_SKIP, |
| 489 | BMRR_FAIL, |
| 490 | } BlkioMemRegionResult; |
| 491 | |
| 492 | /* |
| 493 | * Produce a struct blkio_mem_region for a given address and size. |
| 494 | * |
| 495 | * This function produces identical results when called multiple times with the |
| 496 | * same arguments. This property is necessary because blkio_unmap_mem_region() |
| 497 | * must receive the same struct blkio_mem_region field values that were passed |
| 498 | * to blkio_map_mem_region(). |
| 499 | */ |
| 500 | static BlkioMemRegionResult |
| 501 | blkio_mem_region_from_host(BlockDriverState *bs, |
| 502 | void *host, size_t size, |
| 503 | struct blkio_mem_region *region, |
| 504 | Error **errp) |
| 505 | { |
| 506 | BDRVBlkioState *s = bs->opaque; |
| 507 | int fd = -1; |
| 508 | ram_addr_t fd_offset = 0; |
| 509 | |
| 510 | if (((uintptr_t)host | size) % s->mem_region_alignment) { |
| 511 | error_setg(errp, "unaligned buf %p with size %zu", host, size); |
| 512 | return BMRR_FAIL; |
| 513 | } |
| 514 | |
| 515 | /* Attempt to find the fd for the underlying memory */ |
| 516 | if (s->needs_mem_region_fd) { |
| 517 | RAMBlock *ram_block; |
| 518 | RAMBlock *end_block; |
| 519 | ram_addr_t offset; |
| 520 | |
| 521 | /* |
| 522 | * bdrv_register_buf() is called with the BQL held so mr lives at least |
| 523 | * until this function returns. |
| 524 | */ |
| 525 | ram_block = qemu_ram_block_from_host(host, false, &fd_offset); |
| 526 | if (ram_block) { |
| 527 | fd = qemu_ram_get_fd(ram_block); |
| 528 | } |
| 529 | if (fd == -1) { |
| 530 | /* |
| 531 | * Ideally every RAMBlock would have an fd. pc-bios and other |
| 532 | * things don't. Luckily they are usually not I/O buffers and we |
| 533 | * can just ignore them. |
| 534 | */ |
| 535 | return BMRR_SKIP; |
| 536 | } |
| 537 | |
| 538 | /* Make sure the fd covers the entire range */ |
| 539 | end_block = qemu_ram_block_from_host(host + size - 1, false, &offset); |
| 540 | if (ram_block != end_block) { |
| 541 | error_setg(errp, "registered buffer at %p with size %zu extends " |
| 542 | "beyond RAMBlock", host, size); |
| 543 | return BMRR_FAIL; |
| 544 | } |
| 545 | } |
| 546 | |
| 547 | *region = (struct blkio_mem_region){ |
| 548 | .addr = host, |
| 549 | .len = size, |
| 550 | .fd = fd, |
| 551 | .fd_offset = fd_offset, |
| 552 | }; |
| 553 | return BMRR_OK; |
| 554 | } |
| 555 | |
| 556 | static bool blkio_register_buf(BlockDriverState *bs, void *host, size_t size, |
| 557 | Error **errp) |
| 558 | { |
| 559 | BDRVBlkioState *s = bs->opaque; |
| 560 | struct blkio_mem_region region; |
| 561 | BlkioMemRegionResult region_result; |
| 562 | int ret; |
| 563 | |
| 564 | /* |
| 565 | * Mapping memory regions conflicts with RAM discard (virtio-mem) when |
| 566 | * there is pinning, so only do it when necessary. |
| 567 | */ |
| 568 | if (!s->needs_mem_regions && s->may_pin_mem_regions) { |
| 569 | return true; |
| 570 | } |
| 571 | |
| 572 | region_result = blkio_mem_region_from_host(bs, host, size, ®ion, errp); |
| 573 | if (region_result == BMRR_SKIP) { |
| 574 | return true; |
| 575 | } else if (region_result != BMRR_OK) { |
| 576 | return false; |
| 577 | } |
| 578 | |
| 579 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 580 | ret = blkio_map_mem_region(s->blkio, ®ion); |
| 581 | } |
| 582 | |
| 583 | if (ret < 0) { |
| 584 | error_setg(errp, "Failed to add blkio mem region %p with size %zu: %s", |
| 585 | host, size, blkio_get_error_msg()); |
| 586 | return false; |
| 587 | } |
| 588 | return true; |
| 589 | } |
| 590 | |
| 591 | static void blkio_unregister_buf(BlockDriverState *bs, void *host, size_t size) |
| 592 | { |
| 593 | BDRVBlkioState *s = bs->opaque; |
| 594 | struct blkio_mem_region region; |
| 595 | |
| 596 | /* See blkio_register_buf() */ |
| 597 | if (!s->needs_mem_regions && s->may_pin_mem_regions) { |
| 598 | return; |
| 599 | } |
| 600 | |
| 601 | if (blkio_mem_region_from_host(bs, host, size, ®ion, NULL) != BMRR_OK) { |
| 602 | return; |
| 603 | } |
| 604 | |
| 605 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
| 606 | blkio_unmap_mem_region(s->blkio, ®ion); |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | static int blkio_io_uring_connect(BlockDriverState *bs, QDict *options, |
| 611 | int flags, Error **errp) |
| 612 | { |
| 613 | const char *filename = qdict_get_str(options, "filename"); |
| 614 | BDRVBlkioState *s = bs->opaque; |
| 615 | int ret; |
| 616 | |
| 617 | ret = blkio_set_str(s->blkio, "path", filename); |
| 618 | qdict_del(options, "filename"); |
| 619 | if (ret < 0) { |
| 620 | error_setg_errno(errp, -ret, "failed to set path: %s", |
| 621 | blkio_get_error_msg()); |
| 622 | return ret; |
| 623 | } |
| 624 | |
| 625 | if (flags & BDRV_O_NOCACHE) { |
| 626 | ret = blkio_set_bool(s->blkio, "direct", true); |
| 627 | if (ret < 0) { |
| 628 | error_setg_errno(errp, -ret, "failed to set direct: %s", |
| 629 | blkio_get_error_msg()); |
| 630 | return ret; |
| 631 | } |
| 632 | } |
| 633 | |
| 634 | ret = blkio_connect(s->blkio); |
| 635 | if (ret < 0) { |
| 636 | error_setg_errno(errp, -ret, "blkio_connect failed: %s", |
| 637 | blkio_get_error_msg()); |
| 638 | return ret; |
| 639 | } |
| 640 | |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | static int blkio_nvme_io_uring_connect(BlockDriverState *bs, QDict *options, |
| 645 | int flags, Error **errp) |
| 646 | { |
| 647 | const char *path = qdict_get_try_str(options, "path"); |
| 648 | BDRVBlkioState *s = bs->opaque; |
| 649 | int ret; |
| 650 | |
| 651 | if (!path) { |
| 652 | error_setg(errp, "missing 'path' option"); |
| 653 | return -EINVAL; |
| 654 | } |
| 655 | |
| 656 | ret = blkio_set_str(s->blkio, "path", path); |
| 657 | qdict_del(options, "path"); |
| 658 | if (ret < 0) { |
| 659 | error_setg_errno(errp, -ret, "failed to set path: %s", |
| 660 | blkio_get_error_msg()); |
| 661 | return ret; |
| 662 | } |
| 663 | |
| 664 | if (!(flags & BDRV_O_NOCACHE)) { |
| 665 | error_setg(errp, "cache.direct=off is not supported"); |
| 666 | return -EINVAL; |
| 667 | } |
| 668 | |
| 669 | ret = blkio_connect(s->blkio); |
| 670 | if (ret < 0) { |
| 671 | error_setg_errno(errp, -ret, "blkio_connect failed: %s", |
| 672 | blkio_get_error_msg()); |
| 673 | return ret; |
| 674 | } |
| 675 | |
| 676 | return 0; |
| 677 | } |
| 678 | |
| 679 | static int blkio_virtio_blk_connect(BlockDriverState *bs, QDict *options, |
| 680 | int flags, Error **errp) |
| 681 | { |
| 682 | const char *path = qdict_get_try_str(options, "path"); |
| 683 | BDRVBlkioState *s = bs->opaque; |
| 684 | bool fd_supported = false; |
| 685 | int fd = -1, ret; |
| 686 | |
| 687 | if (!path) { |
| 688 | error_setg(errp, "missing 'path' option"); |
| 689 | return -EINVAL; |
| 690 | } |
| 691 | |
| 692 | if (!(flags & BDRV_O_NOCACHE)) { |
| 693 | error_setg(errp, "cache.direct=off is not supported"); |
| 694 | return -EINVAL; |
| 695 | } |
| 696 | |
| 697 | if (blkio_set_int(s->blkio, "fd", -1) == 0) { |
| 698 | fd_supported = true; |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * If the libblkio driver supports fd passing, let's always use qemu_open() |
| 703 | * to open the `path`, so we can handle fd passing from the management |
| 704 | * layer through the "/dev/fdset/N" special path. |
| 705 | */ |
| 706 | if (fd_supported) { |
| 707 | /* |
| 708 | * `path` can contain the path of a character device |
| 709 | * (e.g. /dev/vhost-vdpa-0 or /dev/vfio/vfio) or a unix socket. |
| 710 | * |
| 711 | * So, we should always open it with O_RDWR flag, also if BDRV_O_RDWR |
| 712 | * is not set in the open flags, because the exchange of IOCTL commands |
| 713 | * for example will fail. |
| 714 | * |
| 715 | * In order to open the device read-only, we are using the `read-only` |
| 716 | * property of the libblkio driver in blkio_open(). |
| 717 | */ |
| 718 | fd = qemu_open(path, O_RDWR, NULL); |
| 719 | if (fd < 0) { |
| 720 | /* |
| 721 | * qemu_open() can fail if the user specifies a path that is not |
| 722 | * a file or device, for example in the case of Unix Domain Socket |
| 723 | * for the virtio-blk-vhost-user driver. In such cases let's have |
| 724 | * libblkio open the path directly. |
| 725 | */ |
| 726 | fd_supported = false; |
| 727 | } else { |
| 728 | ret = blkio_set_int(s->blkio, "fd", fd); |
| 729 | if (ret < 0) { |
| 730 | fd_supported = false; |
| 731 | qemu_close(fd); |
| 732 | fd = -1; |
| 733 | } |
| 734 | } |
| 735 | } |
| 736 | |
| 737 | if (!fd_supported) { |
| 738 | ret = blkio_set_str(s->blkio, "path", path); |
| 739 | if (ret < 0) { |
| 740 | error_setg_errno(errp, -ret, "failed to set path: %s", |
| 741 | blkio_get_error_msg()); |
| 742 | return ret; |
| 743 | } |
| 744 | } |
| 745 | |
| 746 | ret = blkio_connect(s->blkio); |
| 747 | if (ret < 0 && fd >= 0) { |
| 748 | /* Failed to give the FD to libblkio, close it */ |
| 749 | qemu_close(fd); |
| 750 | fd = -1; |
| 751 | } |
| 752 | |
| 753 | /* |
| 754 | * Before https://gitlab.com/libblkio/libblkio/-/merge_requests/208 |
| 755 | * (libblkio <= v1.3.0), setting the `fd` property is not enough to check |
| 756 | * whether the driver supports the `fd` property or not. In that case, |
| 757 | * blkio_connect() will fail with -EINVAL. |
| 758 | * So let's try calling blkio_connect() again by directly setting `path` |
| 759 | * to cover this scenario. |
| 760 | */ |
| 761 | if (fd_supported && ret == -EINVAL) { |
| 762 | /* |
| 763 | * We need to clear the `fd` property we set previously by setting |
| 764 | * it to -1. |
| 765 | */ |
| 766 | ret = blkio_set_int(s->blkio, "fd", -1); |
| 767 | if (ret < 0) { |
| 768 | error_setg_errno(errp, -ret, "failed to set fd: %s", |
| 769 | blkio_get_error_msg()); |
| 770 | return ret; |
| 771 | } |
| 772 | |
| 773 | ret = blkio_set_str(s->blkio, "path", path); |
| 774 | if (ret < 0) { |
| 775 | error_setg_errno(errp, -ret, "failed to set path: %s", |
| 776 | blkio_get_error_msg()); |
| 777 | return ret; |
| 778 | } |
| 779 | |
| 780 | ret = blkio_connect(s->blkio); |
| 781 | } |
| 782 | |
| 783 | if (ret < 0) { |
| 784 | error_setg_errno(errp, -ret, "blkio_connect failed: %s", |
| 785 | blkio_get_error_msg()); |
| 786 | return ret; |
| 787 | } |
| 788 | |
| 789 | qdict_del(options, "path"); |
| 790 | |
| 791 | return 0; |
| 792 | } |
| 793 | |
| 794 | static int blkio_open(BlockDriverState *bs, QDict *options, int flags, |
| 795 | Error **errp) |
| 796 | { |
| 797 | const char *blkio_driver = bs->drv->protocol_name; |
| 798 | BDRVBlkioState *s = bs->opaque; |
| 799 | int ret; |
| 800 | |
| 801 | ret = blkio_create(blkio_driver, &s->blkio); |
| 802 | if (ret < 0) { |
| 803 | error_setg_errno(errp, -ret, "blkio_create failed: %s", |
| 804 | blkio_get_error_msg()); |
| 805 | return ret; |
| 806 | } |
| 807 | |
| 808 | if (!(flags & BDRV_O_RDWR)) { |
| 809 | ret = blkio_set_bool(s->blkio, "read-only", true); |
| 810 | if (ret < 0) { |
| 811 | error_setg_errno(errp, -ret, "failed to set read-only: %s", |
| 812 | blkio_get_error_msg()); |
| 813 | blkio_destroy(&s->blkio); |
| 814 | return ret; |
| 815 | } |
| 816 | } |
| 817 | |
| 818 | if (strcmp(blkio_driver, "io_uring") == 0) { |
| 819 | ret = blkio_io_uring_connect(bs, options, flags, errp); |
| 820 | } else if (strcmp(blkio_driver, "nvme-io_uring") == 0) { |
| 821 | ret = blkio_nvme_io_uring_connect(bs, options, flags, errp); |
| 822 | } else if (strcmp(blkio_driver, "virtio-blk-vfio-pci") == 0) { |
| 823 | ret = blkio_virtio_blk_connect(bs, options, flags, errp); |
| 824 | } else if (strcmp(blkio_driver, "virtio-blk-vhost-user") == 0) { |
| 825 | ret = blkio_virtio_blk_connect(bs, options, flags, errp); |
| 826 | } else if (strcmp(blkio_driver, "virtio-blk-vhost-vdpa") == 0) { |
| 827 | ret = blkio_virtio_blk_connect(bs, options, flags, errp); |
| 828 | } else { |
| 829 | g_assert_not_reached(); |
| 830 | } |
| 831 | if (ret < 0) { |
| 832 | blkio_destroy(&s->blkio); |
| 833 | return ret; |
| 834 | } |
| 835 | |
| 836 | ret = blkio_get_bool(s->blkio, |
| 837 | "needs-mem-regions", |
| 838 | &s->needs_mem_regions); |
| 839 | if (ret < 0) { |
| 840 | error_setg_errno(errp, -ret, |
| 841 | "failed to get needs-mem-regions: %s", |
| 842 | blkio_get_error_msg()); |
| 843 | blkio_destroy(&s->blkio); |
| 844 | return ret; |
| 845 | } |
| 846 | |
| 847 | ret = blkio_get_bool(s->blkio, |
| 848 | "needs-mem-region-fd", |
| 849 | &s->needs_mem_region_fd); |
| 850 | if (ret < 0) { |
| 851 | error_setg_errno(errp, -ret, |
| 852 | "failed to get needs-mem-region-fd: %s", |
| 853 | blkio_get_error_msg()); |
| 854 | blkio_destroy(&s->blkio); |
| 855 | return ret; |
| 856 | } |
| 857 | |
| 858 | ret = blkio_get_uint64(s->blkio, |
| 859 | "mem-region-alignment", |
| 860 | &s->mem_region_alignment); |
| 861 | if (ret < 0) { |
| 862 | error_setg_errno(errp, -ret, |
| 863 | "failed to get mem-region-alignment: %s", |
| 864 | blkio_get_error_msg()); |
| 865 | blkio_destroy(&s->blkio); |
| 866 | return ret; |
| 867 | } |
| 868 | |
| 869 | ret = blkio_get_bool(s->blkio, |
| 870 | "may-pin-mem-regions", |
| 871 | &s->may_pin_mem_regions); |
| 872 | if (ret < 0) { |
| 873 | /* Be conservative (assume pinning) if the property is not supported */ |
| 874 | s->may_pin_mem_regions = s->needs_mem_regions; |
| 875 | } |
| 876 | |
| 877 | /* |
| 878 | * Notify if libblkio drivers pin memory and prevent features like |
| 879 | * virtio-mem from working. |
| 880 | */ |
| 881 | if (s->may_pin_mem_regions) { |
| 882 | ret = ram_block_discard_disable(true); |
| 883 | if (ret < 0) { |
| 884 | error_setg_errno(errp, -ret, "ram_block_discard_disable() failed"); |
| 885 | blkio_destroy(&s->blkio); |
| 886 | return ret; |
| 887 | } |
| 888 | } |
| 889 | |
| 890 | ret = blkio_start(s->blkio); |
| 891 | if (ret < 0) { |
| 892 | error_setg_errno(errp, -ret, "blkio_start failed: %s", |
| 893 | blkio_get_error_msg()); |
| 894 | blkio_destroy(&s->blkio); |
| 895 | if (s->may_pin_mem_regions) { |
| 896 | ram_block_discard_disable(false); |
| 897 | } |
| 898 | return ret; |
| 899 | } |
| 900 | |
| 901 | bs->supported_write_flags = BDRV_REQ_FUA | BDRV_REQ_REGISTERED_BUF; |
| 902 | bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK; |
| 903 | #ifdef CONFIG_BLKIO_WRITE_ZEROS_FUA |
| 904 | bs->supported_zero_flags |= BDRV_REQ_FUA; |
| 905 | #endif |
| 906 | |
| 907 | qemu_mutex_init(&s->blkio_lock); |
| 908 | qemu_co_mutex_init(&s->bounce_lock); |
| 909 | qemu_co_queue_init(&s->bounce_available); |
| 910 | QLIST_INIT(&s->bounce_bufs); |
| 911 | s->blkioq = blkio_get_queue(s->blkio, 0); |
| 912 | s->completion_fd = blkioq_get_completion_fd(s->blkioq); |
| 913 | blkioq_set_completion_fd_enabled(s->blkioq, true); |
| 914 | |
| 915 | blkio_attach_aio_context(bs, bdrv_get_aio_context(bs)); |
| 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | static void blkio_close(BlockDriverState *bs) |
| 920 | { |
| 921 | BDRVBlkioState *s = bs->opaque; |
| 922 | |
| 923 | /* There is no destroy() API for s->bounce_lock */ |
| 924 | |
| 925 | qemu_mutex_destroy(&s->blkio_lock); |
| 926 | blkio_detach_aio_context(bs); |
| 927 | blkio_destroy(&s->blkio); |
| 928 | |
| 929 | if (s->may_pin_mem_regions) { |
| 930 | ram_block_discard_disable(false); |
| 931 | } |
| 932 | } |
| 933 | |
| 934 | static int64_t coroutine_fn blkio_co_getlength(BlockDriverState *bs) |
| 935 | { |
| 936 | BDRVBlkioState *s = bs->opaque; |
| 937 | uint64_t capacity; |
| 938 | int ret; |
| 939 | |
| 940 | QEMU_LOCK_GUARD(&s->blkio_lock); |
| 941 | ret = blkio_get_uint64(s->blkio, "capacity", &capacity); |
| 942 | if (ret < 0) { |
| 943 | return -ret; |
| 944 | } |
| 945 | |
| 946 | return capacity; |
| 947 | } |
| 948 | |
| 949 | static int coroutine_fn blkio_truncate(BlockDriverState *bs, int64_t offset, |
| 950 | bool exact, PreallocMode prealloc, |
| 951 | BdrvRequestFlags flags, Error **errp) |
| 952 | { |
| 953 | int64_t current_length; |
| 954 | |
| 955 | if (prealloc != PREALLOC_MODE_OFF) { |
| 956 | error_setg(errp, "Unsupported preallocation mode '%s'", |
| 957 | PreallocMode_str(prealloc)); |
| 958 | return -ENOTSUP; |
| 959 | } |
| 960 | |
| 961 | current_length = blkio_co_getlength(bs); |
| 962 | |
| 963 | if (offset > current_length) { |
| 964 | error_setg(errp, "Cannot grow device"); |
| 965 | return -EINVAL; |
| 966 | } else if (exact && offset != current_length) { |
| 967 | error_setg(errp, "Cannot resize device"); |
| 968 | return -ENOTSUP; |
| 969 | } |
| 970 | |
| 971 | return 0; |
| 972 | } |
| 973 | |
| 974 | static int coroutine_fn |
| 975 | blkio_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
| 976 | { |
| 977 | return 0; |
| 978 | } |
| 979 | |
| 980 | static void blkio_refresh_limits(BlockDriverState *bs, Error **errp) |
| 981 | { |
| 982 | BDRVBlkioState *s = bs->opaque; |
| 983 | QEMU_LOCK_GUARD(&s->blkio_lock); |
| 984 | int value; |
| 985 | int ret; |
| 986 | |
| 987 | ret = blkio_get_int(s->blkio, "request-alignment", &value); |
| 988 | if (ret < 0) { |
| 989 | error_setg_errno(errp, -ret, "failed to get \"request-alignment\": %s", |
| 990 | blkio_get_error_msg()); |
| 991 | return; |
| 992 | } |
| 993 | bs->bl.request_alignment = value; |
| 994 | if (bs->bl.request_alignment < 1 || |
| 995 | bs->bl.request_alignment >= INT_MAX || |
| 996 | !is_power_of_2(bs->bl.request_alignment)) { |
| 997 | error_setg(errp, "invalid \"request-alignment\" value %" PRIu32 ", " |
| 998 | "must be a power of 2 less than INT_MAX", |
| 999 | bs->bl.request_alignment); |
| 1000 | return; |
| 1001 | } |
| 1002 | |
| 1003 | ret = blkio_get_int(s->blkio, "optimal-io-size", &value); |
| 1004 | if (ret < 0) { |
| 1005 | error_setg_errno(errp, -ret, "failed to get \"optimal-io-size\": %s", |
| 1006 | blkio_get_error_msg()); |
| 1007 | return; |
| 1008 | } |
| 1009 | bs->bl.opt_transfer = value; |
| 1010 | if (bs->bl.opt_transfer > INT_MAX || |
| 1011 | (bs->bl.opt_transfer % bs->bl.request_alignment)) { |
| 1012 | error_setg(errp, "invalid \"optimal-io-size\" value %" PRIu32 ", must " |
| 1013 | "be a multiple of %" PRIu32, bs->bl.opt_transfer, |
| 1014 | bs->bl.request_alignment); |
| 1015 | return; |
| 1016 | } |
| 1017 | |
| 1018 | ret = blkio_get_int(s->blkio, "max-transfer", &value); |
| 1019 | if (ret < 0) { |
| 1020 | error_setg_errno(errp, -ret, "failed to get \"max-transfer\": %s", |
| 1021 | blkio_get_error_msg()); |
| 1022 | return; |
| 1023 | } |
| 1024 | bs->bl.max_transfer = value; |
| 1025 | if ((bs->bl.max_transfer % bs->bl.request_alignment) || |
| 1026 | (bs->bl.opt_transfer && (bs->bl.max_transfer % bs->bl.opt_transfer))) { |
| 1027 | error_setg(errp, "invalid \"max-transfer\" value %" PRIu32 ", must be " |
| 1028 | "a multiple of %" PRIu32 " and %" PRIu32 " (if non-zero)", |
| 1029 | bs->bl.max_transfer, bs->bl.request_alignment, |
| 1030 | bs->bl.opt_transfer); |
| 1031 | return; |
| 1032 | } |
| 1033 | |
| 1034 | ret = blkio_get_int(s->blkio, "buf-alignment", &value); |
| 1035 | if (ret < 0) { |
| 1036 | error_setg_errno(errp, -ret, "failed to get \"buf-alignment\": %s", |
| 1037 | blkio_get_error_msg()); |
| 1038 | return; |
| 1039 | } |
| 1040 | if (value < 1) { |
| 1041 | error_setg(errp, "invalid \"buf-alignment\" value %d, must be " |
| 1042 | "positive", value); |
| 1043 | return; |
| 1044 | } |
| 1045 | bs->bl.min_mem_alignment = value; |
| 1046 | |
| 1047 | ret = blkio_get_int(s->blkio, "optimal-buf-alignment", &value); |
| 1048 | if (ret < 0) { |
| 1049 | error_setg_errno(errp, -ret, |
| 1050 | "failed to get \"optimal-buf-alignment\": %s", |
| 1051 | blkio_get_error_msg()); |
| 1052 | return; |
| 1053 | } |
| 1054 | if (value < 1) { |
| 1055 | error_setg(errp, "invalid \"optimal-buf-alignment\" value %d, " |
| 1056 | "must be positive", value); |
| 1057 | return; |
| 1058 | } |
| 1059 | bs->bl.opt_mem_alignment = value; |
| 1060 | |
| 1061 | ret = blkio_get_int(s->blkio, "max-segments", &value); |
| 1062 | if (ret < 0) { |
| 1063 | error_setg_errno(errp, -ret, "failed to get \"max-segments\": %s", |
| 1064 | blkio_get_error_msg()); |
| 1065 | return; |
| 1066 | } |
| 1067 | if (value < 1) { |
| 1068 | error_setg(errp, "invalid \"max-segments\" value %d, must be positive", |
| 1069 | value); |
| 1070 | return; |
| 1071 | } |
| 1072 | bs->bl.max_iov = value; |
| 1073 | } |
| 1074 | |
| 1075 | /* |
| 1076 | * TODO |
| 1077 | * Missing libblkio APIs: |
| 1078 | * - block_status |
| 1079 | * - co_invalidate_cache |
| 1080 | * |
| 1081 | * Out of scope? |
| 1082 | * - create |
| 1083 | * - truncate |
| 1084 | */ |
| 1085 | |
| 1086 | /* |
| 1087 | * Do not include .format_name and .protocol_name because module_block.py |
| 1088 | * does not parse macros in the source code. |
| 1089 | */ |
| 1090 | #define BLKIO_DRIVER_COMMON \ |
| 1091 | .instance_size = sizeof(BDRVBlkioState), \ |
| 1092 | .bdrv_open = blkio_open, \ |
| 1093 | .bdrv_close = blkio_close, \ |
| 1094 | .bdrv_co_getlength = blkio_co_getlength, \ |
| 1095 | .bdrv_co_truncate = blkio_truncate, \ |
| 1096 | .bdrv_co_get_info = blkio_co_get_info, \ |
| 1097 | .bdrv_attach_aio_context = blkio_attach_aio_context, \ |
| 1098 | .bdrv_detach_aio_context = blkio_detach_aio_context, \ |
| 1099 | .bdrv_co_pdiscard = blkio_co_pdiscard, \ |
| 1100 | .bdrv_co_preadv = blkio_co_preadv, \ |
| 1101 | .bdrv_co_pwritev = blkio_co_pwritev, \ |
| 1102 | .bdrv_co_flush_to_disk = blkio_co_flush, \ |
| 1103 | .bdrv_co_pwrite_zeroes = blkio_co_pwrite_zeroes, \ |
| 1104 | .bdrv_refresh_limits = blkio_refresh_limits, \ |
| 1105 | .bdrv_register_buf = blkio_register_buf, \ |
| 1106 | .bdrv_unregister_buf = blkio_unregister_buf, |
| 1107 | |
| 1108 | /* |
| 1109 | * Use the same .format_name and .protocol_name as the libblkio driver name for |
| 1110 | * consistency. |
| 1111 | */ |
| 1112 | |
| 1113 | static BlockDriver bdrv_io_uring = { |
| 1114 | .format_name = "io_uring", |
| 1115 | .protocol_name = "io_uring", |
| 1116 | .bdrv_needs_filename = true, |
| 1117 | BLKIO_DRIVER_COMMON |
| 1118 | }; |
| 1119 | |
| 1120 | static BlockDriver bdrv_nvme_io_uring = { |
| 1121 | .format_name = "nvme-io_uring", |
| 1122 | .protocol_name = "nvme-io_uring", |
| 1123 | BLKIO_DRIVER_COMMON |
| 1124 | }; |
| 1125 | |
| 1126 | static BlockDriver bdrv_virtio_blk_vfio_pci = { |
| 1127 | .format_name = "virtio-blk-vfio-pci", |
| 1128 | .protocol_name = "virtio-blk-vfio-pci", |
| 1129 | BLKIO_DRIVER_COMMON |
| 1130 | }; |
| 1131 | |
| 1132 | static BlockDriver bdrv_virtio_blk_vhost_user = { |
| 1133 | .format_name = "virtio-blk-vhost-user", |
| 1134 | .protocol_name = "virtio-blk-vhost-user", |
| 1135 | BLKIO_DRIVER_COMMON |
| 1136 | }; |
| 1137 | |
| 1138 | static BlockDriver bdrv_virtio_blk_vhost_vdpa = { |
| 1139 | .format_name = "virtio-blk-vhost-vdpa", |
| 1140 | .protocol_name = "virtio-blk-vhost-vdpa", |
| 1141 | BLKIO_DRIVER_COMMON |
| 1142 | }; |
| 1143 | |
| 1144 | static void bdrv_blkio_init(void) |
| 1145 | { |
| 1146 | bdrv_register(&bdrv_io_uring); |
| 1147 | bdrv_register(&bdrv_nvme_io_uring); |
| 1148 | bdrv_register(&bdrv_virtio_blk_vfio_pci); |
| 1149 | bdrv_register(&bdrv_virtio_blk_vhost_user); |
| 1150 | bdrv_register(&bdrv_virtio_blk_vhost_vdpa); |
| 1151 | } |
| 1152 | |
| 1153 | block_init(bdrv_blkio_init); |