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