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