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