1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2011 NetApp, Inc. 5 * All rights reserved. 6 * Copyright 2020-2021 Joyent, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 /* 30 * This file and its contents are supplied under the terms of the 31 * Common Development and Distribution License ("CDDL"), version 1.0. 32 * You may only use this file in accordance with the terms of version 33 * 1.0 of the CDDL. 34 * 35 * A full copy of the text of the CDDL should have accompanied this 36 * source. A copy of the CDDL is also available via the Internet at 37 * http://www.illumos.org/license/CDDL. 38 * 39 * Copyright 2014 Pluribus Networks Inc. 40 */ 41 42 43 #include <sys/param.h> 44 #include <sys/linker_set.h> 45 #include <sys/stat.h> 46 #include <sys/uio.h> 47 #include <sys/ioctl.h> 48 #include <sys/disk.h> 49 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <stdint.h> 55 #include <string.h> 56 #include <strings.h> 57 #include <unistd.h> 58 #include <assert.h> 59 #include <pthread.h> 60 #include <md5.h> 61 62 #include "bhyverun.h" 63 #include "config.h" 64 #include "debug.h" 65 #include "pci_emul.h" 66 #include "virtio.h" 67 #include "block_if.h" 68 69 #define VTBLK_BSIZE 512 70 #define VTBLK_RINGSZ 128 71 72 _Static_assert(VTBLK_RINGSZ <= BLOCKIF_RING_MAX, "Each ring entry must be able to queue a request"); 73 74 #define VTBLK_S_OK 0 75 #define VTBLK_S_IOERR 1 76 #define VTBLK_S_UNSUPP 2 77 78 #define VTBLK_BLK_ID_BYTES 20 + 1 79 80 /* Capability bits */ 81 #define VTBLK_F_BARRIER (1 << 0) /* Does host support barriers? */ 82 #define VTBLK_F_SIZE_MAX (1 << 1) /* Indicates maximum segment size */ 83 #define VTBLK_F_SEG_MAX (1 << 2) /* Indicates maximum # of segments */ 84 #define VTBLK_F_GEOMETRY (1 << 4) /* Legacy geometry available */ 85 #define VTBLK_F_RO (1 << 5) /* Disk is read-only */ 86 #define VTBLK_F_BLK_SIZE (1 << 6) /* Block size of disk is available*/ 87 #define VTBLK_F_SCSI (1 << 7) /* Supports scsi command passthru */ 88 #define VTBLK_F_FLUSH (1 << 9) /* Writeback mode enabled after reset */ 89 #define VTBLK_F_WCE (1 << 9) /* Legacy alias for FLUSH */ 90 #define VTBLK_F_TOPOLOGY (1 << 10) /* Topology information is available */ 91 #define VTBLK_F_CONFIG_WCE (1 << 11) /* Writeback mode available in config */ 92 #define VTBLK_F_MQ (1 << 12) /* Multi-Queue */ 93 #define VTBLK_F_DISCARD (1 << 13) /* Trim blocks */ 94 #define VTBLK_F_WRITE_ZEROES (1 << 14) /* Write zeros */ 95 96 /* 97 * Host capabilities 98 */ 99 #define VTBLK_S_HOSTCAPS \ 100 ( VTBLK_F_SEG_MAX | \ 101 VTBLK_F_BLK_SIZE | \ 102 VTBLK_F_FLUSH | \ 103 VTBLK_F_TOPOLOGY | \ 104 VIRTIO_RING_F_INDIRECT_DESC ) /* indirect descriptors */ 105 106 /* 107 * The current blockif_delete() interface only allows a single delete 108 * request at a time. 109 */ 110 #define VTBLK_MAX_DISCARD_SEG 1 111 112 /* 113 * An arbitrary limit to prevent excessive latency due to large 114 * delete requests. 115 */ 116 #define VTBLK_MAX_DISCARD_SECT ((16 << 20) / VTBLK_BSIZE) /* 16 MiB */ 117 118 /* 119 * Config space "registers" 120 */ 121 struct vtblk_config { 122 uint64_t vbc_capacity; 123 uint32_t vbc_size_max; 124 uint32_t vbc_seg_max; 125 struct { 126 uint16_t cylinders; 127 uint8_t heads; 128 uint8_t sectors; 129 } vbc_geometry; 130 uint32_t vbc_blk_size; 131 struct { 132 uint8_t physical_block_exp; 133 uint8_t alignment_offset; 134 uint16_t min_io_size; 135 uint32_t opt_io_size; 136 } vbc_topology; 137 uint8_t vbc_writeback; 138 uint8_t unused0[1]; 139 uint16_t num_queues; 140 uint32_t max_discard_sectors; 141 uint32_t max_discard_seg; 142 uint32_t discard_sector_alignment; 143 uint32_t max_write_zeroes_sectors; 144 uint32_t max_write_zeroes_seg; 145 uint8_t write_zeroes_may_unmap; 146 uint8_t unused1[3]; 147 } __packed; 148 149 /* 150 * Fixed-size block header 151 */ 152 struct virtio_blk_hdr { 153 #define VBH_OP_READ 0 154 #define VBH_OP_WRITE 1 155 #define VBH_OP_SCSI_CMD 2 156 #define VBH_OP_SCSI_CMD_OUT 3 157 #define VBH_OP_FLUSH 4 158 #define VBH_OP_FLUSH_OUT 5 159 #define VBH_OP_IDENT 8 160 #define VBH_OP_DISCARD 11 161 #define VBH_OP_WRITE_ZEROES 13 162 163 #define VBH_FLAG_BARRIER 0x80000000 /* OR'ed into vbh_type */ 164 uint32_t vbh_type; 165 uint32_t vbh_ioprio; 166 uint64_t vbh_sector; 167 } __packed; 168 169 /* 170 * Debug printf 171 */ 172 static int pci_vtblk_debug; 173 #define DPRINTF(params) if (pci_vtblk_debug) PRINTLN params 174 #define WPRINTF(params) PRINTLN params 175 176 struct pci_vtblk_ioreq { 177 struct blockif_req io_req; 178 struct pci_vtblk_softc *io_sc; 179 uint8_t *io_status; 180 uint16_t io_idx; 181 }; 182 183 struct virtio_blk_discard_write_zeroes { 184 uint64_t sector; 185 uint32_t num_sectors; 186 struct { 187 uint32_t unmap:1; 188 uint32_t reserved:31; 189 } flags; 190 }; 191 192 /* 193 * Per-device softc 194 */ 195 struct pci_vtblk_softc { 196 struct virtio_softc vbsc_vs; 197 pthread_mutex_t vsc_mtx; 198 struct vqueue_info vbsc_vq; 199 struct vtblk_config vbsc_cfg; 200 struct virtio_consts vbsc_consts; 201 struct blockif_ctxt *bc; 202 #ifndef __FreeBSD__ 203 int vbsc_wce; 204 #endif 205 char vbsc_ident[VTBLK_BLK_ID_BYTES]; 206 struct pci_vtblk_ioreq vbsc_ios[VTBLK_RINGSZ]; 207 }; 208 209 static void pci_vtblk_reset(void *); 210 static void pci_vtblk_notify(void *, struct vqueue_info *); 211 static int pci_vtblk_cfgread(void *, int, int, uint32_t *); 212 static int pci_vtblk_cfgwrite(void *, int, int, uint32_t); 213 #ifndef __FreeBSD__ 214 static void pci_vtblk_apply_feats(void *, uint64_t); 215 #endif 216 217 static struct virtio_consts vtblk_vi_consts = { 218 .vc_name = "vtblk", 219 .vc_nvq = 1, 220 .vc_cfgsize = sizeof(struct vtblk_config), 221 .vc_reset = pci_vtblk_reset, 222 .vc_qnotify = pci_vtblk_notify, 223 .vc_cfgread = pci_vtblk_cfgread, 224 .vc_cfgwrite = pci_vtblk_cfgwrite, 225 #ifndef __FreeBSD__ 226 .vc_apply_features = pci_vtblk_apply_feats, 227 #else 228 .vc_apply_features = NULL, 229 #endif 230 .vc_hv_caps = VTBLK_S_HOSTCAPS, 231 }; 232 233 static void 234 pci_vtblk_reset(void *vsc) 235 { 236 struct pci_vtblk_softc *sc = vsc; 237 238 DPRINTF(("vtblk: device reset requested !")); 239 vi_reset_dev(&sc->vbsc_vs); 240 #ifndef __FreeBSD__ 241 /* Disable write cache until FLUSH feature is negotiated */ 242 (void) blockif_set_wce(sc->bc, 0); 243 sc->vbsc_wce = 0; 244 #endif 245 } 246 247 static void 248 pci_vtblk_done_locked(struct pci_vtblk_ioreq *io, int err) 249 { 250 struct pci_vtblk_softc *sc = io->io_sc; 251 252 /* convert errno into a virtio block error return */ 253 if (err == EOPNOTSUPP || err == ENOSYS) 254 *io->io_status = VTBLK_S_UNSUPP; 255 else if (err != 0) 256 *io->io_status = VTBLK_S_IOERR; 257 else 258 *io->io_status = VTBLK_S_OK; 259 260 /* 261 * Return the descriptor back to the host. 262 * We wrote 1 byte (our status) to host. 263 */ 264 vq_relchain(&sc->vbsc_vq, io->io_idx, 1); 265 vq_endchains(&sc->vbsc_vq, 0); 266 } 267 268 static void 269 pci_vtblk_done(struct blockif_req *br, int err) 270 { 271 struct pci_vtblk_ioreq *io = br->br_param; 272 struct pci_vtblk_softc *sc = io->io_sc; 273 274 pthread_mutex_lock(&sc->vsc_mtx); 275 pci_vtblk_done_locked(io, err); 276 pthread_mutex_unlock(&sc->vsc_mtx); 277 } 278 279 static void 280 pci_vtblk_proc(struct pci_vtblk_softc *sc, struct vqueue_info *vq) 281 { 282 struct virtio_blk_hdr *vbh; 283 struct pci_vtblk_ioreq *io; 284 int i, n; 285 int err; 286 ssize_t iolen; 287 int writeop, type; 288 struct vi_req req; 289 struct iovec iov[BLOCKIF_IOV_MAX + 2]; 290 struct virtio_blk_discard_write_zeroes *discard; 291 292 n = vq_getchain(vq, iov, BLOCKIF_IOV_MAX + 2, &req); 293 294 /* 295 * The first descriptor will be the read-only fixed header, 296 * and the last is for status (hence +2 above and below). 297 * The remaining iov's are the actual data I/O vectors. 298 * 299 * XXX - note - this fails on crash dump, which does a 300 * VIRTIO_BLK_T_FLUSH with a zero transfer length 301 */ 302 assert(n >= 2 && n <= BLOCKIF_IOV_MAX + 2); 303 304 io = &sc->vbsc_ios[req.idx]; 305 assert(req.readable != 0); 306 assert(iov[0].iov_len == sizeof(struct virtio_blk_hdr)); 307 vbh = (struct virtio_blk_hdr *)iov[0].iov_base; 308 memcpy(&io->io_req.br_iov, &iov[1], sizeof(struct iovec) * (n - 2)); 309 io->io_req.br_iovcnt = n - 2; 310 io->io_req.br_offset = vbh->vbh_sector * VTBLK_BSIZE; 311 io->io_status = (uint8_t *)iov[--n].iov_base; 312 assert(req.writable != 0); 313 assert(iov[n].iov_len == 1); 314 315 /* 316 * XXX 317 * The guest should not be setting the BARRIER flag because 318 * we don't advertise the capability. 319 */ 320 type = vbh->vbh_type & ~VBH_FLAG_BARRIER; 321 writeop = (type == VBH_OP_WRITE || type == VBH_OP_DISCARD); 322 /* 323 * - Write op implies read-only descriptor 324 * - Read/ident op implies write-only descriptor 325 * 326 * By taking away either the read-only fixed header or the write-only 327 * status iovec, the following condition should hold true. 328 */ 329 assert(n == (writeop ? req.readable : req.writable)); 330 331 iolen = 0; 332 for (i = 1; i < n; i++) { 333 iolen += iov[i].iov_len; 334 } 335 io->io_req.br_resid = iolen; 336 337 DPRINTF(("virtio-block: %s op, %zd bytes, %d segs, offset %ld", 338 writeop ? "write/discard" : "read/ident", iolen, i - 1, 339 io->io_req.br_offset)); 340 341 switch (type) { 342 case VBH_OP_READ: 343 err = blockif_read(sc->bc, &io->io_req); 344 break; 345 case VBH_OP_WRITE: 346 err = blockif_write(sc->bc, &io->io_req); 347 break; 348 case VBH_OP_DISCARD: 349 /* 350 * We currently only support a single request, if the guest 351 * has submitted a request that doesn't conform to the 352 * requirements, we return a error. 353 */ 354 if (iov[1].iov_len != sizeof (*discard)) { 355 pci_vtblk_done_locked(io, EINVAL); 356 return; 357 } 358 359 /* The segments to discard are provided rather than data */ 360 discard = (struct virtio_blk_discard_write_zeroes *) 361 iov[1].iov_base; 362 363 /* 364 * virtio v1.1 5.2.6.2: 365 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP 366 * for discard and write zeroes commands if any unknown flag is 367 * set. Furthermore, the device MUST set the status byte to 368 * VIRTIO_BLK_S_UNSUPP for discard commands if the unmap flag 369 * is set. 370 * 371 * Currently there are no known flags for a DISCARD request. 372 */ 373 if (discard->flags.unmap != 0 || discard->flags.reserved != 0) { 374 pci_vtblk_done_locked(io, ENOTSUP); 375 return; 376 } 377 378 /* Make sure the request doesn't exceed our size limit */ 379 if (discard->num_sectors > VTBLK_MAX_DISCARD_SECT) { 380 pci_vtblk_done_locked(io, EINVAL); 381 return; 382 } 383 384 io->io_req.br_offset = discard->sector * VTBLK_BSIZE; 385 io->io_req.br_resid = discard->num_sectors * VTBLK_BSIZE; 386 err = blockif_delete(sc->bc, &io->io_req); 387 break; 388 case VBH_OP_FLUSH: 389 case VBH_OP_FLUSH_OUT: 390 err = blockif_flush(sc->bc, &io->io_req); 391 break; 392 case VBH_OP_IDENT: 393 /* Assume a single buffer */ 394 /* S/n equal to buffer is not zero-terminated. */ 395 memset(iov[1].iov_base, 0, iov[1].iov_len); 396 strncpy(iov[1].iov_base, sc->vbsc_ident, 397 MIN(iov[1].iov_len, sizeof(sc->vbsc_ident))); 398 pci_vtblk_done_locked(io, 0); 399 return; 400 default: 401 pci_vtblk_done_locked(io, EOPNOTSUPP); 402 return; 403 } 404 assert(err == 0); 405 } 406 407 static void 408 pci_vtblk_notify(void *vsc, struct vqueue_info *vq) 409 { 410 struct pci_vtblk_softc *sc = vsc; 411 412 while (vq_has_descs(vq)) 413 pci_vtblk_proc(sc, vq); 414 } 415 416 static void 417 pci_vtblk_resized(struct blockif_ctxt *bctxt __unused, void *arg, 418 size_t new_size) 419 { 420 struct pci_vtblk_softc *sc; 421 422 sc = arg; 423 424 sc->vbsc_cfg.vbc_capacity = new_size / VTBLK_BSIZE; /* 512-byte units */ 425 vi_interrupt(&sc->vbsc_vs, VIRTIO_PCI_ISR_CONFIG, 426 sc->vbsc_vs.vs_msix_cfg_idx); 427 } 428 429 static int 430 pci_vtblk_init(struct pci_devinst *pi, nvlist_t *nvl) 431 { 432 char bident[sizeof("XXX:XXX")]; 433 struct blockif_ctxt *bctxt; 434 const char *path, *serial; 435 MD5_CTX mdctx; 436 u_char digest[16]; 437 struct pci_vtblk_softc *sc; 438 off_t size; 439 int i, sectsz, sts, sto; 440 441 /* 442 * The supplied backing file has to exist 443 */ 444 snprintf(bident, sizeof(bident), "%u:%u", pi->pi_slot, pi->pi_func); 445 bctxt = blockif_open(nvl, bident); 446 if (bctxt == NULL) { 447 perror("Could not open backing file"); 448 return (1); 449 } 450 451 if (blockif_add_boot_device(pi, bctxt)) { 452 perror("Invalid boot device"); 453 return (1); 454 } 455 456 size = blockif_size(bctxt); 457 sectsz = blockif_sectsz(bctxt); 458 blockif_psectsz(bctxt, &sts, &sto); 459 460 sc = calloc(1, sizeof(struct pci_vtblk_softc)); 461 sc->bc = bctxt; 462 for (i = 0; i < VTBLK_RINGSZ; i++) { 463 struct pci_vtblk_ioreq *io = &sc->vbsc_ios[i]; 464 io->io_req.br_callback = pci_vtblk_done; 465 io->io_req.br_param = io; 466 io->io_sc = sc; 467 io->io_idx = i; 468 } 469 470 bcopy(&vtblk_vi_consts, &sc->vbsc_consts, sizeof (vtblk_vi_consts)); 471 if (blockif_candelete(sc->bc)) 472 sc->vbsc_consts.vc_hv_caps |= VTBLK_F_DISCARD; 473 474 #ifndef __FreeBSD__ 475 /* Disable write cache until FLUSH feature is negotiated */ 476 (void) blockif_set_wce(sc->bc, 0); 477 sc->vbsc_wce = 0; 478 #endif 479 480 pthread_mutex_init(&sc->vsc_mtx, NULL); 481 482 /* init virtio softc and virtqueues */ 483 vi_softc_linkup(&sc->vbsc_vs, &sc->vbsc_consts, sc, pi, &sc->vbsc_vq); 484 sc->vbsc_vs.vs_mtx = &sc->vsc_mtx; 485 486 sc->vbsc_vq.vq_qsize = VTBLK_RINGSZ; 487 /* sc->vbsc_vq.vq_notify = we have no per-queue notify */ 488 489 /* 490 * If an explicit identifier is not given, create an 491 * identifier using parts of the md5 sum of the filename. 492 */ 493 bzero(sc->vbsc_ident, VTBLK_BLK_ID_BYTES); 494 if ((serial = get_config_value_node(nvl, "serial")) != NULL || 495 (serial = get_config_value_node(nvl, "ser")) != NULL) { 496 strlcpy(sc->vbsc_ident, serial, VTBLK_BLK_ID_BYTES); 497 } else { 498 path = get_config_value_node(nvl, "path"); 499 MD5Init(&mdctx); 500 MD5Update(&mdctx, path, strlen(path)); 501 MD5Final(digest, &mdctx); 502 snprintf(sc->vbsc_ident, VTBLK_BLK_ID_BYTES, 503 "BHYVE-%02X%02X-%02X%02X-%02X%02X", 504 digest[0], digest[1], digest[2], digest[3], digest[4], 505 digest[5]); 506 } 507 508 /* setup virtio block config space */ 509 sc->vbsc_cfg.vbc_capacity = size / VTBLK_BSIZE; /* 512-byte units */ 510 sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */ 511 512 /* 513 * If Linux is presented with a seg_max greater than the virtio queue 514 * size, it can stumble into situations where it violates its own 515 * invariants and panics. For safety, we keep seg_max clamped, paying 516 * heed to the two extra descriptors needed for the header and status 517 * of a request. 518 */ 519 sc->vbsc_cfg.vbc_seg_max = MIN(VTBLK_RINGSZ - 2, BLOCKIF_IOV_MAX); 520 sc->vbsc_cfg.vbc_geometry.cylinders = 0; /* no geometry */ 521 sc->vbsc_cfg.vbc_geometry.heads = 0; 522 sc->vbsc_cfg.vbc_geometry.sectors = 0; 523 sc->vbsc_cfg.vbc_blk_size = sectsz; 524 sc->vbsc_cfg.vbc_topology.physical_block_exp = 525 (sts > sectsz) ? (ffsll(sts / sectsz) - 1) : 0; 526 sc->vbsc_cfg.vbc_topology.alignment_offset = 527 (sto != 0) ? ((sts - sto) / sectsz) : 0; 528 sc->vbsc_cfg.vbc_topology.min_io_size = 0; 529 sc->vbsc_cfg.vbc_topology.opt_io_size = 0; 530 sc->vbsc_cfg.vbc_writeback = 0; 531 sc->vbsc_cfg.max_discard_sectors = VTBLK_MAX_DISCARD_SECT; 532 sc->vbsc_cfg.max_discard_seg = VTBLK_MAX_DISCARD_SEG; 533 sc->vbsc_cfg.discard_sector_alignment = MAX(sectsz, sts) / VTBLK_BSIZE; 534 535 /* 536 * Should we move some of this into virtio.c? Could 537 * have the device, class, and subdev_0 as fields in 538 * the virtio constants structure. 539 */ 540 pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_BLOCK); 541 pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR); 542 pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_STORAGE); 543 pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_ID_BLOCK); 544 pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_VENDOR); 545 546 if (vi_intr_init(&sc->vbsc_vs, 1, fbsdrun_virtio_msix())) { 547 blockif_close(sc->bc); 548 free(sc); 549 return (1); 550 } 551 vi_set_io_bar(&sc->vbsc_vs, 0); 552 blockif_register_resize_callback(sc->bc, pci_vtblk_resized, sc); 553 return (0); 554 } 555 556 static int 557 pci_vtblk_cfgwrite(void *vsc __unused, int offset, int size __unused, 558 uint32_t value __unused) 559 { 560 561 DPRINTF(("vtblk: write to readonly reg %d", offset)); 562 return (1); 563 } 564 565 static int 566 pci_vtblk_cfgread(void *vsc, int offset, int size, uint32_t *retval) 567 { 568 struct pci_vtblk_softc *sc = vsc; 569 void *ptr; 570 571 /* our caller has already verified offset and size */ 572 ptr = (uint8_t *)&sc->vbsc_cfg + offset; 573 memcpy(retval, ptr, size); 574 return (0); 575 } 576 577 #ifndef __FreeBSD__ 578 void 579 pci_vtblk_apply_feats(void *vsc, uint64_t caps) 580 { 581 struct pci_vtblk_softc *sc = vsc; 582 const int wce_next = ((caps & VTBLK_F_FLUSH) != 0) ? 1 : 0; 583 584 if (sc->vbsc_wce != wce_next) { 585 (void) blockif_set_wce(sc->bc, wce_next); 586 sc->vbsc_wce = wce_next; 587 } 588 } 589 #endif /* __FreeBSD__ */ 590 591 static const struct pci_devemu pci_de_vblk = { 592 .pe_emu = "virtio-blk", 593 .pe_init = pci_vtblk_init, 594 .pe_legacy_config = blockif_legacy_config, 595 .pe_barwrite = vi_pci_write, 596 .pe_barread = vi_pci_read, 597 }; 598 PCI_EMUL_SET(pci_de_vblk); 599