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 #include <sys/cdefs.h> 31 #include <sys/param.h> 32 #include <sys/linker_set.h> 33 #include <sys/stat.h> 34 #include <sys/uio.h> 35 #include <sys/ioctl.h> 36 #include <sys/disk.h> 37 38 #include <machine/vmm_snapshot.h> 39 40 #include <errno.h> 41 #include <fcntl.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <stdint.h> 45 #include <string.h> 46 #include <strings.h> 47 #include <unistd.h> 48 #include <assert.h> 49 #include <pthread.h> 50 #include <md5.h> 51 52 #include "bhyverun.h" 53 #include "config.h" 54 #include "debug.h" 55 #include "pci_emul.h" 56 #include "virtio.h" 57 #include "block_if.h" 58 59 #define VTBLK_BSIZE 512 60 #define VTBLK_RINGSZ 128 61 62 _Static_assert(VTBLK_RINGSZ <= BLOCKIF_RING_MAX, "Each ring entry must be able to queue a request"); 63 64 #define VTBLK_S_OK 0 65 #define VTBLK_S_IOERR 1 66 #define VTBLK_S_UNSUPP 2 67 68 #define VTBLK_BLK_ID_BYTES 20 + 1 69 70 /* Capability bits */ 71 #define VTBLK_F_BARRIER (1 << 0) /* Does host support barriers? */ 72 #define VTBLK_F_SIZE_MAX (1 << 1) /* Indicates maximum segment size */ 73 #define VTBLK_F_SEG_MAX (1 << 2) /* Indicates maximum # of segments */ 74 #define VTBLK_F_GEOMETRY (1 << 4) /* Legacy geometry available */ 75 #define VTBLK_F_RO (1 << 5) /* Disk is read-only */ 76 #define VTBLK_F_BLK_SIZE (1 << 6) /* Block size of disk is available*/ 77 #define VTBLK_F_SCSI (1 << 7) /* Supports scsi command passthru */ 78 #define VTBLK_F_FLUSH (1 << 9) /* Writeback mode enabled after reset */ 79 #define VTBLK_F_WCE (1 << 9) /* Legacy alias for FLUSH */ 80 #define VTBLK_F_TOPOLOGY (1 << 10) /* Topology information is available */ 81 #define VTBLK_F_CONFIG_WCE (1 << 11) /* Writeback mode available in config */ 82 #define VTBLK_F_MQ (1 << 12) /* Multi-Queue */ 83 #define VTBLK_F_DISCARD (1 << 13) /* Trim blocks */ 84 #define VTBLK_F_WRITE_ZEROES (1 << 14) /* Write zeros */ 85 86 /* 87 * Host capabilities 88 */ 89 #define VTBLK_S_HOSTCAPS \ 90 ( VTBLK_F_SEG_MAX | \ 91 VTBLK_F_BLK_SIZE | \ 92 VTBLK_F_FLUSH | \ 93 VTBLK_F_TOPOLOGY | \ 94 VIRTIO_RING_F_INDIRECT_DESC ) /* indirect descriptors */ 95 96 /* 97 * The current blockif_delete() interface only allows a single delete 98 * request at a time. 99 */ 100 #define VTBLK_MAX_DISCARD_SEG 1 101 102 /* 103 * An arbitrary limit to prevent excessive latency due to large 104 * delete requests. 105 */ 106 #define VTBLK_MAX_DISCARD_SECT ((16 << 20) / VTBLK_BSIZE) /* 16 MiB */ 107 108 /* 109 * Config space "registers" 110 */ 111 struct vtblk_config { 112 uint64_t vbc_capacity; 113 uint32_t vbc_size_max; 114 uint32_t vbc_seg_max; 115 struct { 116 uint16_t cylinders; 117 uint8_t heads; 118 uint8_t sectors; 119 } vbc_geometry; 120 uint32_t vbc_blk_size; 121 struct { 122 uint8_t physical_block_exp; 123 uint8_t alignment_offset; 124 uint16_t min_io_size; 125 uint32_t opt_io_size; 126 } vbc_topology; 127 uint8_t vbc_writeback; 128 uint8_t unused0[1]; 129 uint16_t num_queues; 130 uint32_t max_discard_sectors; 131 uint32_t max_discard_seg; 132 uint32_t discard_sector_alignment; 133 uint32_t max_write_zeroes_sectors; 134 uint32_t max_write_zeroes_seg; 135 uint8_t write_zeroes_may_unmap; 136 uint8_t unused1[3]; 137 } __packed; 138 139 /* 140 * Fixed-size block header 141 */ 142 struct virtio_blk_hdr { 143 #define VBH_OP_READ 0 144 #define VBH_OP_WRITE 1 145 #define VBH_OP_SCSI_CMD 2 146 #define VBH_OP_SCSI_CMD_OUT 3 147 #define VBH_OP_FLUSH 4 148 #define VBH_OP_FLUSH_OUT 5 149 #define VBH_OP_IDENT 8 150 #define VBH_OP_DISCARD 11 151 #define VBH_OP_WRITE_ZEROES 13 152 153 #define VBH_FLAG_BARRIER 0x80000000 /* OR'ed into vbh_type */ 154 uint32_t vbh_type; 155 uint32_t vbh_ioprio; 156 uint64_t vbh_sector; 157 } __packed; 158 159 /* 160 * Debug printf 161 */ 162 static int pci_vtblk_debug; 163 #define DPRINTF(params) if (pci_vtblk_debug) PRINTLN params 164 #define WPRINTF(params) PRINTLN params 165 166 struct pci_vtblk_ioreq { 167 struct blockif_req io_req; 168 struct pci_vtblk_softc *io_sc; 169 uint8_t *io_status; 170 uint16_t io_idx; 171 }; 172 173 struct virtio_blk_discard_write_zeroes { 174 uint64_t sector; 175 uint32_t num_sectors; 176 struct { 177 uint32_t unmap:1; 178 uint32_t reserved:31; 179 } flags; 180 }; 181 182 /* 183 * Per-device softc 184 */ 185 struct pci_vtblk_softc { 186 struct virtio_softc vbsc_vs; 187 pthread_mutex_t vsc_mtx; 188 struct vqueue_info vbsc_vq; 189 struct vtblk_config vbsc_cfg; 190 struct virtio_consts vbsc_consts; 191 struct blockif_ctxt *bc; 192 char vbsc_ident[VTBLK_BLK_ID_BYTES]; 193 struct pci_vtblk_ioreq vbsc_ios[VTBLK_RINGSZ]; 194 }; 195 196 static void pci_vtblk_reset(void *); 197 static void pci_vtblk_notify(void *, struct vqueue_info *); 198 static int pci_vtblk_cfgread(void *, int, int, uint32_t *); 199 static int pci_vtblk_cfgwrite(void *, int, int, uint32_t); 200 #ifdef BHYVE_SNAPSHOT 201 static void pci_vtblk_pause(void *); 202 static void pci_vtblk_resume(void *); 203 static int pci_vtblk_snapshot(void *, struct vm_snapshot_meta *); 204 #endif 205 206 static struct virtio_consts vtblk_vi_consts = { 207 .vc_name = "vtblk", 208 .vc_nvq = 1, 209 .vc_cfgsize = sizeof(struct vtblk_config), 210 .vc_reset = pci_vtblk_reset, 211 .vc_qnotify = pci_vtblk_notify, 212 .vc_cfgread = pci_vtblk_cfgread, 213 .vc_cfgwrite = pci_vtblk_cfgwrite, 214 .vc_apply_features = NULL, 215 .vc_hv_caps = VTBLK_S_HOSTCAPS, 216 #ifdef BHYVE_SNAPSHOT 217 .vc_pause = pci_vtblk_pause, 218 .vc_resume = pci_vtblk_resume, 219 .vc_snapshot = pci_vtblk_snapshot, 220 #endif 221 }; 222 223 static void 224 pci_vtblk_reset(void *vsc) 225 { 226 struct pci_vtblk_softc *sc = vsc; 227 228 DPRINTF(("vtblk: device reset requested !")); 229 vi_reset_dev(&sc->vbsc_vs); 230 } 231 232 static void 233 pci_vtblk_done_locked(struct pci_vtblk_ioreq *io, int err) 234 { 235 struct pci_vtblk_softc *sc = io->io_sc; 236 237 /* convert errno into a virtio block error return */ 238 if (err == EOPNOTSUPP || err == ENOSYS) 239 *io->io_status = VTBLK_S_UNSUPP; 240 else if (err != 0) 241 *io->io_status = VTBLK_S_IOERR; 242 else 243 *io->io_status = VTBLK_S_OK; 244 245 /* 246 * Return the descriptor back to the host. 247 * We wrote 1 byte (our status) to host. 248 */ 249 vq_relchain(&sc->vbsc_vq, io->io_idx, 1); 250 vq_endchains(&sc->vbsc_vq, 0); 251 } 252 253 #ifdef BHYVE_SNAPSHOT 254 static void 255 pci_vtblk_pause(void *vsc) 256 { 257 struct pci_vtblk_softc *sc = vsc; 258 259 DPRINTF(("vtblk: device pause requested !\n")); 260 blockif_pause(sc->bc); 261 } 262 263 static void 264 pci_vtblk_resume(void *vsc) 265 { 266 struct pci_vtblk_softc *sc = vsc; 267 268 DPRINTF(("vtblk: device resume requested !\n")); 269 blockif_resume(sc->bc); 270 } 271 272 static int 273 pci_vtblk_snapshot(void *vsc, struct vm_snapshot_meta *meta) 274 { 275 int ret; 276 struct pci_vtblk_softc *sc = vsc; 277 278 SNAPSHOT_VAR_OR_LEAVE(sc->vbsc_cfg, meta, ret, done); 279 SNAPSHOT_BUF_OR_LEAVE(sc->vbsc_ident, sizeof(sc->vbsc_ident), 280 meta, ret, done); 281 282 done: 283 return (ret); 284 } 285 #endif 286 287 static void 288 pci_vtblk_done(struct blockif_req *br, int err) 289 { 290 struct pci_vtblk_ioreq *io = br->br_param; 291 struct pci_vtblk_softc *sc = io->io_sc; 292 293 pthread_mutex_lock(&sc->vsc_mtx); 294 pci_vtblk_done_locked(io, err); 295 pthread_mutex_unlock(&sc->vsc_mtx); 296 } 297 298 static void 299 pci_vtblk_proc(struct pci_vtblk_softc *sc, struct vqueue_info *vq) 300 { 301 struct virtio_blk_hdr *vbh; 302 struct pci_vtblk_ioreq *io; 303 int i, n; 304 int err; 305 ssize_t iolen; 306 int writeop, type; 307 struct vi_req req; 308 struct iovec iov[BLOCKIF_IOV_MAX + 2]; 309 struct virtio_blk_discard_write_zeroes *discard; 310 311 n = vq_getchain(vq, iov, BLOCKIF_IOV_MAX + 2, &req); 312 313 /* 314 * The first descriptor will be the read-only fixed header, 315 * and the last is for status (hence +2 above and below). 316 * The remaining iov's are the actual data I/O vectors. 317 * 318 * XXX - note - this fails on crash dump, which does a 319 * VIRTIO_BLK_T_FLUSH with a zero transfer length 320 */ 321 assert(n >= 2 && n <= BLOCKIF_IOV_MAX + 2); 322 323 io = &sc->vbsc_ios[req.idx]; 324 assert(req.readable != 0); 325 assert(iov[0].iov_len == sizeof(struct virtio_blk_hdr)); 326 vbh = (struct virtio_blk_hdr *)iov[0].iov_base; 327 memcpy(&io->io_req.br_iov, &iov[1], sizeof(struct iovec) * (n - 2)); 328 io->io_req.br_iovcnt = n - 2; 329 io->io_req.br_offset = vbh->vbh_sector * VTBLK_BSIZE; 330 io->io_status = (uint8_t *)iov[--n].iov_base; 331 assert(req.writable != 0); 332 assert(iov[n].iov_len == 1); 333 334 /* 335 * XXX 336 * The guest should not be setting the BARRIER flag because 337 * we don't advertise the capability. 338 */ 339 type = vbh->vbh_type & ~VBH_FLAG_BARRIER; 340 writeop = (type == VBH_OP_WRITE || type == VBH_OP_DISCARD); 341 /* 342 * - Write op implies read-only descriptor 343 * - Read/ident op implies write-only descriptor 344 * 345 * By taking away either the read-only fixed header or the write-only 346 * status iovec, the following condition should hold true. 347 */ 348 assert(n == (writeop ? req.readable : req.writable)); 349 350 iolen = 0; 351 for (i = 1; i < n; i++) { 352 iolen += iov[i].iov_len; 353 } 354 io->io_req.br_resid = iolen; 355 356 DPRINTF(("virtio-block: %s op, %zd bytes, %d segs, offset %ld", 357 writeop ? "write/discard" : "read/ident", iolen, i - 1, 358 io->io_req.br_offset)); 359 360 switch (type) { 361 case VBH_OP_READ: 362 err = blockif_read(sc->bc, &io->io_req); 363 break; 364 case VBH_OP_WRITE: 365 err = blockif_write(sc->bc, &io->io_req); 366 break; 367 case VBH_OP_DISCARD: 368 /* 369 * We currently only support a single request, if the guest 370 * has submitted a request that doesn't conform to the 371 * requirements, we return a error. 372 */ 373 if (iov[1].iov_len != sizeof (*discard)) { 374 pci_vtblk_done_locked(io, EINVAL); 375 return; 376 } 377 378 /* The segments to discard are provided rather than data */ 379 discard = (struct virtio_blk_discard_write_zeroes *) 380 iov[1].iov_base; 381 382 /* 383 * virtio v1.1 5.2.6.2: 384 * The device MUST set the status byte to VIRTIO_BLK_S_UNSUPP 385 * for discard and write zeroes commands if any unknown flag is 386 * set. Furthermore, the device MUST set the status byte to 387 * VIRTIO_BLK_S_UNSUPP for discard commands if the unmap flag 388 * is set. 389 * 390 * Currently there are no known flags for a DISCARD request. 391 */ 392 if (discard->flags.unmap != 0 || discard->flags.reserved != 0) { 393 pci_vtblk_done_locked(io, ENOTSUP); 394 return; 395 } 396 397 /* Make sure the request doesn't exceed our size limit */ 398 if (discard->num_sectors > VTBLK_MAX_DISCARD_SECT) { 399 pci_vtblk_done_locked(io, EINVAL); 400 return; 401 } 402 403 io->io_req.br_offset = discard->sector * VTBLK_BSIZE; 404 io->io_req.br_resid = discard->num_sectors * VTBLK_BSIZE; 405 err = blockif_delete(sc->bc, &io->io_req); 406 break; 407 case VBH_OP_FLUSH: 408 case VBH_OP_FLUSH_OUT: 409 err = blockif_flush(sc->bc, &io->io_req); 410 break; 411 case VBH_OP_IDENT: 412 /* Assume a single buffer */ 413 /* S/n equal to buffer is not zero-terminated. */ 414 memset(iov[1].iov_base, 0, iov[1].iov_len); 415 strncpy(iov[1].iov_base, sc->vbsc_ident, 416 MIN(iov[1].iov_len, sizeof(sc->vbsc_ident))); 417 pci_vtblk_done_locked(io, 0); 418 return; 419 default: 420 pci_vtblk_done_locked(io, EOPNOTSUPP); 421 return; 422 } 423 assert(err == 0); 424 } 425 426 static void 427 pci_vtblk_notify(void *vsc, struct vqueue_info *vq) 428 { 429 struct pci_vtblk_softc *sc = vsc; 430 431 while (vq_has_descs(vq)) 432 pci_vtblk_proc(sc, vq); 433 } 434 435 static void 436 pci_vtblk_resized(struct blockif_ctxt *bctxt __unused, void *arg, 437 size_t new_size) 438 { 439 struct pci_vtblk_softc *sc; 440 441 sc = arg; 442 443 sc->vbsc_cfg.vbc_capacity = new_size / VTBLK_BSIZE; /* 512-byte units */ 444 vi_interrupt(&sc->vbsc_vs, VIRTIO_PCI_ISR_CONFIG, 445 sc->vbsc_vs.vs_msix_cfg_idx); 446 } 447 448 static int 449 pci_vtblk_init(struct pci_devinst *pi, nvlist_t *nvl) 450 { 451 char bident[sizeof("XXX:XXX")]; 452 struct blockif_ctxt *bctxt; 453 const char *path, *serial; 454 MD5_CTX mdctx; 455 u_char digest[16]; 456 struct pci_vtblk_softc *sc; 457 off_t size; 458 int i, sectsz, sts, sto; 459 460 /* 461 * The supplied backing file has to exist 462 */ 463 snprintf(bident, sizeof(bident), "%u:%u", pi->pi_slot, pi->pi_func); 464 bctxt = blockif_open(nvl, bident); 465 if (bctxt == NULL) { 466 perror("Could not open backing file"); 467 return (1); 468 } 469 470 if (blockif_add_boot_device(pi, bctxt)) { 471 perror("Invalid boot device"); 472 return (1); 473 } 474 475 size = blockif_size(bctxt); 476 sectsz = blockif_sectsz(bctxt); 477 blockif_psectsz(bctxt, &sts, &sto); 478 479 sc = calloc(1, sizeof(struct pci_vtblk_softc)); 480 sc->bc = bctxt; 481 for (i = 0; i < VTBLK_RINGSZ; i++) { 482 struct pci_vtblk_ioreq *io = &sc->vbsc_ios[i]; 483 io->io_req.br_callback = pci_vtblk_done; 484 io->io_req.br_param = io; 485 io->io_sc = sc; 486 io->io_idx = i; 487 } 488 489 bcopy(&vtblk_vi_consts, &sc->vbsc_consts, sizeof (vtblk_vi_consts)); 490 if (blockif_candelete(sc->bc)) 491 sc->vbsc_consts.vc_hv_caps |= VTBLK_F_DISCARD; 492 493 pthread_mutex_init(&sc->vsc_mtx, NULL); 494 495 /* init virtio softc and virtqueues */ 496 vi_softc_linkup(&sc->vbsc_vs, &sc->vbsc_consts, sc, pi, &sc->vbsc_vq); 497 sc->vbsc_vs.vs_mtx = &sc->vsc_mtx; 498 499 sc->vbsc_vq.vq_qsize = VTBLK_RINGSZ; 500 /* sc->vbsc_vq.vq_notify = we have no per-queue notify */ 501 502 /* 503 * If an explicit identifier is not given, create an 504 * identifier using parts of the md5 sum of the filename. 505 */ 506 bzero(sc->vbsc_ident, VTBLK_BLK_ID_BYTES); 507 if ((serial = get_config_value_node(nvl, "serial")) != NULL || 508 (serial = get_config_value_node(nvl, "ser")) != NULL) { 509 strlcpy(sc->vbsc_ident, serial, VTBLK_BLK_ID_BYTES); 510 } else { 511 path = get_config_value_node(nvl, "path"); 512 MD5Init(&mdctx); 513 MD5Update(&mdctx, path, strlen(path)); 514 MD5Final(digest, &mdctx); 515 snprintf(sc->vbsc_ident, VTBLK_BLK_ID_BYTES, 516 "BHYVE-%02X%02X-%02X%02X-%02X%02X", 517 digest[0], digest[1], digest[2], digest[3], digest[4], 518 digest[5]); 519 } 520 521 /* setup virtio block config space */ 522 sc->vbsc_cfg.vbc_capacity = size / VTBLK_BSIZE; /* 512-byte units */ 523 sc->vbsc_cfg.vbc_size_max = 0; /* not negotiated */ 524 525 /* 526 * If Linux is presented with a seg_max greater than the virtio queue 527 * size, it can stumble into situations where it violates its own 528 * invariants and panics. For safety, we keep seg_max clamped, paying 529 * heed to the two extra descriptors needed for the header and status 530 * of a request. 531 */ 532 sc->vbsc_cfg.vbc_seg_max = MIN(VTBLK_RINGSZ - 2, BLOCKIF_IOV_MAX); 533 sc->vbsc_cfg.vbc_geometry.cylinders = 0; /* no geometry */ 534 sc->vbsc_cfg.vbc_geometry.heads = 0; 535 sc->vbsc_cfg.vbc_geometry.sectors = 0; 536 sc->vbsc_cfg.vbc_blk_size = sectsz; 537 sc->vbsc_cfg.vbc_topology.physical_block_exp = 538 (sts > sectsz) ? (ffsll(sts / sectsz) - 1) : 0; 539 sc->vbsc_cfg.vbc_topology.alignment_offset = 540 (sto != 0) ? ((sts - sto) / sectsz) : 0; 541 sc->vbsc_cfg.vbc_topology.min_io_size = 0; 542 sc->vbsc_cfg.vbc_topology.opt_io_size = 0; 543 sc->vbsc_cfg.vbc_writeback = 0; 544 sc->vbsc_cfg.max_discard_sectors = VTBLK_MAX_DISCARD_SECT; 545 sc->vbsc_cfg.max_discard_seg = VTBLK_MAX_DISCARD_SEG; 546 sc->vbsc_cfg.discard_sector_alignment = MAX(sectsz, sts) / VTBLK_BSIZE; 547 548 /* 549 * Should we move some of this into virtio.c? Could 550 * have the device, class, and subdev_0 as fields in 551 * the virtio constants structure. 552 */ 553 pci_set_cfgdata16(pi, PCIR_DEVICE, VIRTIO_DEV_BLOCK); 554 pci_set_cfgdata16(pi, PCIR_VENDOR, VIRTIO_VENDOR); 555 pci_set_cfgdata8(pi, PCIR_CLASS, PCIC_STORAGE); 556 pci_set_cfgdata16(pi, PCIR_SUBDEV_0, VIRTIO_ID_BLOCK); 557 pci_set_cfgdata16(pi, PCIR_SUBVEND_0, VIRTIO_VENDOR); 558 559 if (vi_intr_init(&sc->vbsc_vs, 1, fbsdrun_virtio_msix())) { 560 blockif_close(sc->bc); 561 free(sc); 562 return (1); 563 } 564 vi_set_io_bar(&sc->vbsc_vs, 0); 565 blockif_register_resize_callback(sc->bc, pci_vtblk_resized, sc); 566 return (0); 567 } 568 569 static int 570 pci_vtblk_cfgwrite(void *vsc __unused, int offset, int size __unused, 571 uint32_t value __unused) 572 { 573 574 DPRINTF(("vtblk: write to readonly reg %d", offset)); 575 return (1); 576 } 577 578 static int 579 pci_vtblk_cfgread(void *vsc, int offset, int size, uint32_t *retval) 580 { 581 struct pci_vtblk_softc *sc = vsc; 582 void *ptr; 583 584 /* our caller has already verified offset and size */ 585 ptr = (uint8_t *)&sc->vbsc_cfg + offset; 586 memcpy(retval, ptr, size); 587 return (0); 588 } 589 590 static const struct pci_devemu pci_de_vblk = { 591 .pe_emu = "virtio-blk", 592 .pe_init = pci_vtblk_init, 593 .pe_legacy_config = blockif_legacy_config, 594 .pe_barwrite = vi_pci_write, 595 .pe_barread = vi_pci_read, 596 #ifdef BHYVE_SNAPSHOT 597 .pe_snapshot = vi_pci_snapshot, 598 .pe_pause = vi_pci_pause, 599 .pe_resume = vi_pci_resume, 600 #endif 601 }; 602 PCI_EMUL_SET(pci_de_vblk); 603