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