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 #include <sys/cdefs.h> 43 44 #include <sys/param.h> 45 #include <sys/linker_set.h> 46 #include <sys/stat.h> 47 #include <sys/uio.h> 48 #include <sys/ioctl.h> 49 #include <sys/disk.h> 50 51 #include <errno.h> 52 #include <fcntl.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <stdint.h> 56 #include <string.h> 57 #include <strings.h> 58 #include <unistd.h> 59 #include <assert.h> 60 #include <pthread.h> 61 #include <md5.h> 62 63 #include "bhyverun.h" 64 #include "config.h" 65 #include "debug.h" 66 #include "pci_emul.h" 67 #include "virtio.h" 68 #include "block_if.h" 69 70 #define VTBLK_BSIZE 512 71 #define VTBLK_RINGSZ 128 72 73 _Static_assert(VTBLK_RINGSZ <= BLOCKIF_RING_MAX, "Each ring entry must be able to queue a request"); 74 75 #define VTBLK_S_OK 0 76 #define VTBLK_S_IOERR 1 77 #define VTBLK_S_UNSUPP 2 78 79 #define VTBLK_BLK_ID_BYTES 20 + 1 80 81 /* Capability bits */ 82 #define VTBLK_F_BARRIER (1 << 0) /* Does host support barriers? */ 83 #define VTBLK_F_SIZE_MAX (1 << 1) /* Indicates maximum segment size */ 84 #define VTBLK_F_SEG_MAX (1 << 2) /* Indicates maximum # of segments */ 85 #define VTBLK_F_GEOMETRY (1 << 4) /* Legacy geometry available */ 86 #define VTBLK_F_RO (1 << 5) /* Disk is read-only */ 87 #define VTBLK_F_BLK_SIZE (1 << 6) /* Block size of disk is available*/ 88 #define VTBLK_F_SCSI (1 << 7) /* Supports scsi command passthru */ 89 #define VTBLK_F_FLUSH (1 << 9) /* Writeback mode enabled after reset */ 90 #define VTBLK_F_WCE (1 << 9) /* Legacy alias for FLUSH */ 91 #define VTBLK_F_TOPOLOGY (1 << 10) /* Topology information is available */ 92 #define VTBLK_F_CONFIG_WCE (1 << 11) /* Writeback mode available in config */ 93 #define VTBLK_F_MQ (1 << 12) /* Multi-Queue */ 94 #define VTBLK_F_DISCARD (1 << 13) /* Trim blocks */ 95 #define VTBLK_F_WRITE_ZEROES (1 << 14) /* Write zeros */ 96 97 /* 98 * Host capabilities 99 */ 100 #define VTBLK_S_HOSTCAPS \ 101 ( VTBLK_F_SEG_MAX | \ 102 VTBLK_F_BLK_SIZE | \ 103 VTBLK_F_FLUSH | \ 104 VTBLK_F_TOPOLOGY | \ 105 VIRTIO_RING_F_INDIRECT_DESC ) /* indirect descriptors */ 106 107 /* 108 * The current blockif_delete() interface only allows a single delete 109 * request at a time. 110 */ 111 #define VTBLK_MAX_DISCARD_SEG 1 112 113 /* 114 * An arbitrary limit to prevent excessive latency due to large 115 * delete requests. 116 */ 117 #define VTBLK_MAX_DISCARD_SECT ((16 << 20) / VTBLK_BSIZE) /* 16 MiB */ 118 119 /* 120 * Config space "registers" 121 */ 122 struct vtblk_config { 123 uint64_t vbc_capacity; 124 uint32_t vbc_size_max; 125 uint32_t vbc_seg_max; 126 struct { 127 uint16_t cylinders; 128 uint8_t heads; 129 uint8_t sectors; 130 } vbc_geometry; 131 uint32_t vbc_blk_size; 132 struct { 133 uint8_t physical_block_exp; 134 uint8_t alignment_offset; 135 uint16_t min_io_size; 136 uint32_t opt_io_size; 137 } vbc_topology; 138 uint8_t vbc_writeback; 139 uint8_t unused0[1]; 140 uint16_t num_queues; 141 uint32_t max_discard_sectors; 142 uint32_t max_discard_seg; 143 uint32_t discard_sector_alignment; 144 uint32_t max_write_zeroes_sectors; 145 uint32_t max_write_zeroes_seg; 146 uint8_t write_zeroes_may_unmap; 147 uint8_t unused1[3]; 148 } __packed; 149 150 /* 151 * Fixed-size block header 152 */ 153 struct virtio_blk_hdr { 154 #define VBH_OP_READ 0 155 #define VBH_OP_WRITE 1 156 #define VBH_OP_SCSI_CMD 2 157 #define VBH_OP_SCSI_CMD_OUT 3 158 #define VBH_OP_FLUSH 4 159 #define VBH_OP_FLUSH_OUT 5 160 #define VBH_OP_IDENT 8 161 #define VBH_OP_DISCARD 11 162 #define VBH_OP_WRITE_ZEROES 13 163 164 #define VBH_FLAG_BARRIER 0x80000000 /* OR'ed into vbh_type */ 165 uint32_t vbh_type; 166 uint32_t vbh_ioprio; 167 uint64_t vbh_sector; 168 } __packed; 169 170 /* 171 * Debug printf 172 */ 173 static int pci_vtblk_debug; 174 #define DPRINTF(params) if (pci_vtblk_debug) PRINTLN params 175 #define WPRINTF(params) PRINTLN params 176 177 struct pci_vtblk_ioreq { 178 struct blockif_req io_req; 179 struct pci_vtblk_softc *io_sc; 180 uint8_t *io_status; 181 uint16_t io_idx; 182 }; 183 184 struct virtio_blk_discard_write_zeroes { 185 uint64_t sector; 186 uint32_t num_sectors; 187 struct { 188 uint32_t unmap:1; 189 uint32_t reserved:31; 190 } flags; 191 }; 192 193 /* 194 * Per-device softc 195 */ 196 struct pci_vtblk_softc { 197 struct virtio_softc vbsc_vs; 198 pthread_mutex_t vsc_mtx; 199 struct vqueue_info vbsc_vq; 200 struct vtblk_config vbsc_cfg; 201 struct virtio_consts vbsc_consts; 202 struct blockif_ctxt *bc; 203 #ifndef __FreeBSD__ 204 int vbsc_wce; 205 #endif 206 char vbsc_ident[VTBLK_BLK_ID_BYTES]; 207 struct pci_vtblk_ioreq vbsc_ios[VTBLK_RINGSZ]; 208 }; 209 210 static void pci_vtblk_reset(void *); 211 static void pci_vtblk_notify(void *, struct vqueue_info *); 212 static int pci_vtblk_cfgread(void *, int, int, uint32_t *); 213 static int pci_vtblk_cfgwrite(void *, int, int, uint32_t); 214 #ifndef __FreeBSD__ 215 static void pci_vtblk_apply_feats(void *, uint64_t); 216 #endif 217 218 static struct virtio_consts vtblk_vi_consts = { 219 .vc_name = "vtblk", 220 .vc_nvq = 1, 221 .vc_cfgsize = sizeof(struct vtblk_config), 222 .vc_reset = pci_vtblk_reset, 223 .vc_qnotify = pci_vtblk_notify, 224 .vc_cfgread = pci_vtblk_cfgread, 225 .vc_cfgwrite = pci_vtblk_cfgwrite, 226 #ifndef __FreeBSD__ 227 .vc_apply_features = pci_vtblk_apply_feats, 228 #else 229 .vc_apply_features = NULL, 230 #endif 231 .vc_hv_caps = VTBLK_S_HOSTCAPS, 232 }; 233 234 static void 235 pci_vtblk_reset(void *vsc) 236 { 237 struct pci_vtblk_softc *sc = vsc; 238 239 DPRINTF(("vtblk: device reset requested !")); 240 vi_reset_dev(&sc->vbsc_vs); 241 #ifndef __FreeBSD__ 242 /* Disable write cache until FLUSH feature is negotiated */ 243 (void) blockif_set_wce(sc->bc, 0); 244 sc->vbsc_wce = 0; 245 #endif 246 } 247 248 static void 249 pci_vtblk_done_locked(struct pci_vtblk_ioreq *io, int err) 250 { 251 struct pci_vtblk_softc *sc = io->io_sc; 252 253 /* convert errno into a virtio block error return */ 254 if (err == EOPNOTSUPP || err == ENOSYS) 255 *io->io_status = VTBLK_S_UNSUPP; 256 else if (err != 0) 257 *io->io_status = VTBLK_S_IOERR; 258 else 259 *io->io_status = VTBLK_S_OK; 260 261 /* 262 * Return the descriptor back to the host. 263 * We wrote 1 byte (our status) to host. 264 */ 265 vq_relchain(&sc->vbsc_vq, io->io_idx, 1); 266 vq_endchains(&sc->vbsc_vq, 0); 267 } 268 269 static void 270 pci_vtblk_done(struct blockif_req *br, int err) 271 { 272 struct pci_vtblk_ioreq *io = br->br_param; 273 struct pci_vtblk_softc *sc = io->io_sc; 274 275 pthread_mutex_lock(&sc->vsc_mtx); 276 pci_vtblk_done_locked(io, err); 277 pthread_mutex_unlock(&sc->vsc_mtx); 278 } 279 280 static void 281 pci_vtblk_proc(struct pci_vtblk_softc *sc, struct vqueue_info *vq) 282 { 283 struct virtio_blk_hdr *vbh; 284 struct pci_vtblk_ioreq *io; 285 int i, n; 286 int err; 287 ssize_t iolen; 288 int writeop, type; 289 struct vi_req req; 290 struct iovec iov[BLOCKIF_IOV_MAX + 2]; 291 struct virtio_blk_discard_write_zeroes *discard; 292 293 n = vq_getchain(vq, iov, BLOCKIF_IOV_MAX + 2, &req); 294 295 /* 296 * The first descriptor will be the read-only fixed header, 297 * and the last is for status (hence +2 above and below). 298 * The remaining iov's are the actual data I/O vectors. 299 * 300 * XXX - note - this fails on crash dump, which does a 301 * VIRTIO_BLK_T_FLUSH with a zero transfer length 302 */ 303 assert(n >= 2 && n <= BLOCKIF_IOV_MAX + 2); 304 305 io = &sc->vbsc_ios[req.idx]; 306 assert(req.readable != 0); 307 assert(iov[0].iov_len == sizeof(struct virtio_blk_hdr)); 308 vbh = (struct virtio_blk_hdr *)iov[0].iov_base; 309 memcpy(&io->io_req.br_iov, &iov[1], sizeof(struct iovec) * (n - 2)); 310 io->io_req.br_iovcnt = n - 2; 311 io->io_req.br_offset = vbh->vbh_sector * VTBLK_BSIZE; 312 io->io_status = (uint8_t *)iov[--n].iov_base; 313 assert(req.writable != 0); 314 assert(iov[n].iov_len == 1); 315 316 /* 317 * XXX 318 * The guest should not be setting the BARRIER flag because 319 * we don't advertise the capability. 320 */ 321 type = vbh->vbh_type & ~VBH_FLAG_BARRIER; 322 writeop = (type == VBH_OP_WRITE || type == VBH_OP_DISCARD); 323 /* 324 * - Write op implies read-only descriptor 325 * - Read/ident op implies write-only descriptor 326 * 327 * By taking away either the read-only fixed header or the write-only 328 * status iovec, the following condition should hold true. 329 */ 330 assert(n == (writeop ? req.readable : req.writable)); 331 332 iolen = 0; 333 for (i = 1; i < n; i++) { 334 iolen += iov[i].iov_len; 335 } 336 io->io_req.br_resid = iolen; 337 338 DPRINTF(("virtio-block: %s op, %zd bytes, %d segs, offset %ld", 339 writeop ? "write/discard" : "read/ident", iolen, i - 1, 340 io->io_req.br_offset)); 341 342 switch (type) { 343 case VBH_OP_READ: 344 err = blockif_read(sc->bc, &io->io_req); 345 break; 346 case VBH_OP_WRITE: 347 err = blockif_write(sc->bc, &io->io_req); 348 break; 349 case VBH_OP_DISCARD: 350 /* 351 * We currently only support a single request, if the guest 352 * has submitted a request that doesn't conform to the 353 * requirements, we return a error. 354 */ 355 if (iov[1].iov_len != sizeof (*discard)) { 356 pci_vtblk_done_locked(io, EINVAL); 357 return; 358 } 359 360 /* The segments to discard are provided rather than data */ 361 discard = (struct virtio_blk_discard_write_zeroes *) 362 iov[1].iov_base; 363 364 /* 365 * virtio v1.1 5.2.6.2: 366 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP 367 * for discard and write zeroes commands if any unknown flag is 368 * set. Furthermore, the device MUST set the status byte to 369 * VIRTIO_BLK_S_UNSUPP for discard commands if the unmap flag 370 * is set. 371 * 372 * Currently there are no known flags for a DISCARD request. 373 */ 374 if (discard->flags.unmap != 0 || discard->flags.reserved != 0) { 375 pci_vtblk_done_locked(io, ENOTSUP); 376 return; 377 } 378 379 /* Make sure the request doesn't exceed our size limit */ 380 if (discard->num_sectors > VTBLK_MAX_DISCARD_SECT) { 381 pci_vtblk_done_locked(io, EINVAL); 382 return; 383 } 384 385 io->io_req.br_offset = discard->sector * VTBLK_BSIZE; 386 io->io_req.br_resid = discard->num_sectors * VTBLK_BSIZE; 387 err = blockif_delete(sc->bc, &io->io_req); 388 break; 389 case VBH_OP_FLUSH: 390 case VBH_OP_FLUSH_OUT: 391 err = blockif_flush(sc->bc, &io->io_req); 392 break; 393 case VBH_OP_IDENT: 394 /* Assume a single buffer */ 395 /* S/n equal to buffer is not zero-terminated. */ 396 memset(iov[1].iov_base, 0, iov[1].iov_len); 397 strncpy(iov[1].iov_base, sc->vbsc_ident, 398 MIN(iov[1].iov_len, sizeof(sc->vbsc_ident))); 399 pci_vtblk_done_locked(io, 0); 400 return; 401 default: 402 pci_vtblk_done_locked(io, EOPNOTSUPP); 403 return; 404 } 405 assert(err == 0); 406 } 407 408 static void 409 pci_vtblk_notify(void *vsc, struct vqueue_info *vq) 410 { 411 struct pci_vtblk_softc *sc = vsc; 412 413 while (vq_has_descs(vq)) 414 pci_vtblk_proc(sc, vq); 415 } 416 417 static void 418 pci_vtblk_resized(struct blockif_ctxt *bctxt __unused, void *arg, 419 size_t new_size) 420 { 421 struct pci_vtblk_softc *sc; 422 423 sc = arg; 424 425 sc->vbsc_cfg.vbc_capacity = new_size / VTBLK_BSIZE; /* 512-byte units */ 426 vi_interrupt(&sc->vbsc_vs, VIRTIO_PCI_ISR_CONFIG, 427 sc->vbsc_vs.vs_msix_cfg_idx); 428 } 429 430 static int 431 pci_vtblk_init(struct pci_devinst *pi, nvlist_t *nvl) 432 { 433 char bident[sizeof("XXX:XXX")]; 434 struct blockif_ctxt *bctxt; 435 const char *path, *serial; 436 MD5_CTX mdctx; 437 u_char digest[16]; 438 struct pci_vtblk_softc *sc; 439 off_t size; 440 int i, sectsz, sts, sto; 441 442 /* 443 * The supplied backing file has to exist 444 */ 445 snprintf(bident, sizeof(bident), "%u:%u", pi->pi_slot, pi->pi_func); 446 bctxt = blockif_open(nvl, bident); 447 if (bctxt == NULL) { 448 perror("Could not open backing file"); 449 return (1); 450 } 451 452 if (blockif_add_boot_device(pi, bctxt)) { 453 perror("Invalid boot device"); 454 return (1); 455 } 456 457 size = blockif_size(bctxt); 458 sectsz = blockif_sectsz(bctxt); 459 blockif_psectsz(bctxt, &sts, &sto); 460 461 sc = calloc(1, sizeof(struct pci_vtblk_softc)); 462 sc->bc = bctxt; 463 for (i = 0; i < VTBLK_RINGSZ; i++) { 464 struct pci_vtblk_ioreq *io = &sc->vbsc_ios[i]; 465 io->io_req.br_callback = pci_vtblk_done; 466 io->io_req.br_param = io; 467 io->io_sc = sc; 468 io->io_idx = i; 469 } 470 471 bcopy(&vtblk_vi_consts, &sc->vbsc_consts, sizeof (vtblk_vi_consts)); 472 if (blockif_candelete(sc->bc)) 473 sc->vbsc_consts.vc_hv_caps |= VTBLK_F_DISCARD; 474 475 #ifndef __FreeBSD__ 476 /* Disable write cache until FLUSH feature is negotiated */ 477 (void) blockif_set_wce(sc->bc, 0); 478 sc->vbsc_wce = 0; 479 #endif 480 481 pthread_mutex_init(&sc->vsc_mtx, NULL); 482 483 /* init virtio softc and virtqueues */ 484 vi_softc_linkup(&sc->vbsc_vs, &sc->vbsc_consts, sc, pi, &sc->vbsc_vq); 485 sc->vbsc_vs.vs_mtx = &sc->vsc_mtx; 486 487 sc->vbsc_vq.vq_qsize = VTBLK_RINGSZ; 488 /* sc->vbsc_vq.vq_notify = we have no per-queue notify */ 489 490 /* 491 * If an explicit identifier is not given, create an 492 * identifier using parts of the md5 sum of the filename. 493 */ 494 bzero(sc->vbsc_ident, VTBLK_BLK_ID_BYTES); 495 if ((serial = get_config_value_node(nvl, "serial")) != NULL || 496 (serial = get_config_value_node(nvl, "ser")) != NULL) { 497 strlcpy(sc->vbsc_ident, serial, VTBLK_BLK_ID_BYTES); 498 } else { 499 path = get_config_value_node(nvl, "path"); 500 MD5Init(&mdctx); 501 MD5Update(&mdctx, path, strlen(path)); 502 MD5Final(digest, &mdctx); 503 snprintf(sc->vbsc_ident, VTBLK_BLK_ID_BYTES, 504 "BHYVE-%02X%02X-%02X%02X-%02X%02X", 505 digest[0], digest[1], digest[2], digest[3], digest[4], 506 digest[5]); 507 } 508 509 /* setup virtio block config space */ 510 sc->vbsc_cfg.vbc_capacity = size / VTBLK_BSIZE; /* 512-byte units */ 511 sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */ 512 513 /* 514 * If Linux is presented with a seg_max greater than the virtio queue 515 * size, it can stumble into situations where it violates its own 516 * invariants and panics. For safety, we keep seg_max clamped, paying 517 * heed to the two extra descriptors needed for the header and status 518 * of a request. 519 */ 520 sc->vbsc_cfg.vbc_seg_max = MIN(VTBLK_RINGSZ - 2, BLOCKIF_IOV_MAX); 521 sc->vbsc_cfg.vbc_geometry.cylinders = 0; /* no geometry */ 522 sc->vbsc_cfg.vbc_geometry.heads = 0; 523 sc->vbsc_cfg.vbc_geometry.sectors = 0; 524 sc->vbsc_cfg.vbc_blk_size = sectsz; 525 sc->vbsc_cfg.vbc_topology.physical_block_exp = 526 (sts > sectsz) ? (ffsll(sts / sectsz) - 1) : 0; 527 sc->vbsc_cfg.vbc_topology.alignment_offset = 528 (sto != 0) ? ((sts - sto) / sectsz) : 0; 529 sc->vbsc_cfg.vbc_topology.min_io_size = 0; 530 sc->vbsc_cfg.vbc_topology.opt_io_size = 0; 531 sc->vbsc_cfg.vbc_writeback = 0; 532 sc->vbsc_cfg.max_discard_sectors = VTBLK_MAX_DISCARD_SECT; 533 sc->vbsc_cfg.max_discard_seg = VTBLK_MAX_DISCARD_SEG; 534 sc->vbsc_cfg.discard_sector_alignment = MAX(sectsz, sts) / VTBLK_BSIZE; 535 536 /* 537 * Should we move some of this into virtio.c? Could 538 * have the device, class, and subdev_0 as fields in 539 * the virtio constants structure. 540 */ 541 pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_BLOCK); 542 pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR); 543 pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_STORAGE); 544 pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_ID_BLOCK); 545 pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_VENDOR); 546 547 if (vi_intr_init(&sc->vbsc_vs, 1, fbsdrun_virtio_msix())) { 548 blockif_close(sc->bc); 549 free(sc); 550 return (1); 551 } 552 vi_set_io_bar(&sc->vbsc_vs, 0); 553 blockif_register_resize_callback(sc->bc, pci_vtblk_resized, sc); 554 return (0); 555 } 556 557 static int 558 pci_vtblk_cfgwrite(void *vsc __unused, int offset, int size __unused, 559 uint32_t value __unused) 560 { 561 562 DPRINTF(("vtblk: write to readonly reg %d", offset)); 563 return (1); 564 } 565 566 static int 567 pci_vtblk_cfgread(void *vsc, int offset, int size, uint32_t *retval) 568 { 569 struct pci_vtblk_softc *sc = vsc; 570 void *ptr; 571 572 /* our caller has already verified offset and size */ 573 ptr = (uint8_t *)&sc->vbsc_cfg + offset; 574 memcpy(retval, ptr, size); 575 return (0); 576 } 577 578 #ifndef __FreeBSD__ 579 void 580 pci_vtblk_apply_feats(void *vsc, uint64_t caps) 581 { 582 struct pci_vtblk_softc *sc = vsc; 583 const int wce_next = ((caps & VTBLK_F_FLUSH) != 0) ? 1 : 0; 584 585 if (sc->vbsc_wce != wce_next) { 586 (void) blockif_set_wce(sc->bc, wce_next); 587 sc->vbsc_wce = wce_next; 588 } 589 } 590 #endif /* __FreeBSD__ */ 591 592 static const struct pci_devemu pci_de_vblk = { 593 .pe_emu = "virtio-blk", 594 .pe_init = pci_vtblk_init, 595 .pe_legacy_config = blockif_legacy_config, 596 .pe_barwrite = vi_pci_write, 597 .pe_barread = vi_pci_read, 598 }; 599 PCI_EMUL_SET(pci_de_vblk); 600