2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2013 Chris Torek <torek @ torek net>
6 * Copyright (c) 2019 Joyent, Inc.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR 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
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
36 #include <machine/atomic.h>
38 #include <dev/virtio/pci/virtio_pci_legacy_var.h>
44 #include <pthread_np.h>
55 * Functions for dealing with generalized "virtual devices" as
56 * defined by <https://www.google.com/#output=search&q=virtio+spec>
60 * In case we decide to relax the "virtio softc comes at the
61 * front of virtio-based device softc" constraint, let's use
64 #define DEV_SOFTC(vs) ((void *)(vs))
67 * Link a virtio_softc to its constants, the device softc, and
71 vi_softc_linkup(struct virtio_softc *vs, struct virtio_consts *vc,
72 void *dev_softc, struct pci_devinst *pi,
73 struct vqueue_info *queues)
77 /* vs and dev_softc addresses must match */
78 assert((void *)vs == dev_softc);
83 vs->vs_queues = queues;
84 for (i = 0; i < vc->vc_nvq; i++) {
91 * Reset device (device-wide). This erases all queues, i.e.,
92 * all the queues become invalid (though we don't wipe out the
93 * internal pointers, we just clear the VQ_ALLOC flag).
95 * It resets negotiated features to "none".
97 * If MSI-X is enabled, this also resets all the vectors to NO_VECTOR.
100 vi_reset_dev(struct virtio_softc *vs)
102 struct vqueue_info *vq;
106 assert(pthread_mutex_isowned_np(vs->vs_mtx));
108 nvq = vs->vs_vc->vc_nvq;
109 for (vq = vs->vs_queues, i = 0; i < nvq; vq++, i++) {
111 vq->vq_last_avail = 0;
112 vq->vq_next_used = 0;
113 vq->vq_save_used = 0;
115 vq->vq_msix_idx = VIRTIO_MSI_NO_VECTOR;
117 vs->vs_negotiated_caps = 0;
119 /* vs->vs_status = 0; -- redundant */
121 pci_lintr_deassert(vs->vs_pi);
123 vs->vs_msix_cfg_idx = VIRTIO_MSI_NO_VECTOR;
127 * Set I/O BAR (usually 0) to map PCI config registers.
130 vi_set_io_bar(struct virtio_softc *vs, int barnum)
135 * ??? should we use VIRTIO_PCI_CONFIG_OFF(0) if MSI-X is disabled?
136 * Existing code did not...
138 size = VIRTIO_PCI_CONFIG_OFF(1) + vs->vs_vc->vc_cfgsize;
139 pci_emul_alloc_bar(vs->vs_pi, barnum, PCIBAR_IO, size);
143 * Initialize MSI-X vector capabilities if we're to use MSI-X,
144 * or MSI capabilities if not.
146 * We assume we want one MSI-X vector per queue, here, plus one
147 * for the config vec.
150 vi_intr_init(struct virtio_softc *vs, int barnum, int use_msix)
155 vs->vs_flags |= VIRTIO_USE_MSIX;
157 vi_reset_dev(vs); /* set all vectors to NO_VECTOR */
159 nvec = vs->vs_vc->vc_nvq + 1;
160 if (pci_emul_add_msixcap(vs->vs_pi, nvec, barnum))
163 vs->vs_flags &= ~VIRTIO_USE_MSIX;
165 /* Only 1 MSI vector for bhyve */
166 pci_emul_add_msicap(vs->vs_pi, 1);
168 /* Legacy interrupts are mandatory for virtio devices */
169 pci_lintr_request(vs->vs_pi);
175 * Initialize the currently-selected virtio queue (vs->vs_curq).
176 * The guest just gave us a page frame number, from which we can
177 * calculate the addresses of the queue.
180 vi_vq_init(struct virtio_softc *vs, uint32_t pfn)
182 struct vqueue_info *vq;
187 vq = &vs->vs_queues[vs->vs_curq];
189 phys = (uint64_t)pfn << VRING_PFN;
190 size = vring_size_aligned(vq->vq_qsize);
191 base = paddr_guest2host(vs->vs_pi->pi_vmctx, phys, size);
193 /* First page(s) are descriptors... */
194 vq->vq_desc = (struct vring_desc *)base;
195 base += vq->vq_qsize * sizeof(struct vring_desc);
197 /* ... immediately followed by "avail" ring (entirely uint16_t's) */
198 vq->vq_avail = (struct vring_avail *)base;
199 base += (2 + vq->vq_qsize + 1) * sizeof(uint16_t);
201 /* Then it's rounded up to the next page... */
202 base = (char *)roundup2((uintptr_t)base, VRING_ALIGN);
204 /* ... and the last page(s) are the used ring. */
205 vq->vq_used = (struct vring_used *)base;
207 /* Mark queue as allocated, and start at 0 when we use it. */
208 vq->vq_flags = VQ_ALLOC;
209 vq->vq_last_avail = 0;
210 vq->vq_next_used = 0;
211 vq->vq_save_used = 0;
215 * Helper inline for vq_getchain(): record the i'th "real"
219 _vq_record(int i, struct vring_desc *vd, struct vmctx *ctx, struct iovec *iov,
220 int n_iov, struct vi_req *reqp)
224 iov[i].iov_base = paddr_guest2host(ctx, vd->addr, vd->len);
225 iov[i].iov_len = vd->len;
226 if ((vd->flags & VRING_DESC_F_WRITE) == 0)
231 #define VQ_MAX_DESCRIPTORS 512 /* see below */
234 * Examine the chain of descriptors starting at the "next one" to
235 * make sure that they describe a sensible request. If so, return
236 * the number of "real" descriptors that would be needed/used in
237 * acting on this request. This may be smaller than the number of
238 * available descriptors, e.g., if there are two available but
239 * they are two separate requests, this just returns 1. Or, it
240 * may be larger: if there are indirect descriptors involved,
241 * there may only be one descriptor available but it may be an
242 * indirect pointing to eight more. We return 8 in this case,
243 * i.e., we do not count the indirect descriptors, only the "real"
246 * Basically, this vets the "flags" and "next" field of each
247 * descriptor and tells you how many are involved. Since some may
248 * be indirect, this also needs the vmctx (in the pci_devinst
249 * at vs->vs_pi) so that it can find indirect descriptors.
251 * As we process each descriptor, we copy and adjust it (guest to
252 * host address wise, also using the vmtctx) into the given iov[]
253 * array (of the given size). If the array overflows, we stop
254 * placing values into the array but keep processing descriptors,
255 * up to VQ_MAX_DESCRIPTORS, before giving up and returning -1.
256 * So you, the caller, must not assume that iov[] is as big as the
257 * return value (you can process the same thing twice to allocate
258 * a larger iov array if needed, or supply a zero length to find
259 * out how much space is needed).
261 * If some descriptor(s) are invalid, this prints a diagnostic message
262 * and returns -1. If no descriptors are ready now it simply returns 0.
264 * You are assumed to have done a vq_ring_ready() if needed (note
265 * that vq_has_descs() does one).
268 vq_getchain(struct vqueue_info *vq, struct iovec *iov, int niov,
272 u_int ndesc, n_indir;
275 struct vring_desc *vdir, *vindir, *vp;
277 struct virtio_softc *vs;
281 name = vs->vs_vc->vc_name;
282 memset(&req, 0, sizeof(req));
285 * Note: it's the responsibility of the guest not to
286 * update vq->vq_avail->idx until all of the descriptors
287 * the guest has written are valid (including all their
288 * "next" fields and "flags").
290 * Compute (vq_avail->idx - last_avail) in integers mod 2**16. This is
291 * the number of descriptors the device has made available
292 * since the last time we updated vq->vq_last_avail.
294 * We just need to do the subtraction as an unsigned int,
295 * then trim off excess bits.
297 idx = vq->vq_last_avail;
298 ndesc = (uint16_t)((u_int)vq->vq_avail->idx - idx);
301 if (ndesc > vq->vq_qsize) {
302 /* XXX need better way to diagnose issues */
304 "%s: ndesc (%u) out of range, driver confused?",
310 * Now count/parse "involved" descriptors starting from
311 * the head of the chain.
313 * To prevent loops, we could be more complicated and
314 * check whether we're re-visiting a previously visited
315 * index, but we just abort if the count gets excessive.
317 ctx = vs->vs_pi->pi_vmctx;
318 req.idx = next = vq->vq_avail->ring[idx & (vq->vq_qsize - 1)];
320 for (i = 0; i < VQ_MAX_DESCRIPTORS; next = vdir->next) {
321 if (next >= vq->vq_qsize) {
323 "%s: descriptor index %u out of range, "
328 vdir = &vq->vq_desc[next];
329 if ((vdir->flags & VRING_DESC_F_INDIRECT) == 0) {
330 _vq_record(i, vdir, ctx, iov, niov, &req);
332 } else if ((vs->vs_vc->vc_hv_caps &
333 VIRTIO_RING_F_INDIRECT_DESC) == 0) {
335 "%s: descriptor has forbidden INDIRECT flag, "
340 n_indir = vdir->len / 16;
341 if ((vdir->len & 0xf) || n_indir == 0) {
343 "%s: invalid indir len 0x%x, "
345 name, (u_int)vdir->len);
348 vindir = paddr_guest2host(ctx,
349 vdir->addr, vdir->len);
351 * Indirects start at the 0th, then follow
352 * their own embedded "next"s until those run
353 * out. Each one's indirect flag must be off
354 * (we don't really have to check, could just
360 if (vp->flags & VRING_DESC_F_INDIRECT) {
362 "%s: indirect desc has INDIR flag,"
367 _vq_record(i, vp, ctx, iov, niov, &req);
368 if (++i > VQ_MAX_DESCRIPTORS)
370 if ((vp->flags & VRING_DESC_F_NEXT) == 0)
373 if (next >= n_indir) {
375 "%s: invalid next %u > %u, "
377 name, (u_int)next, n_indir);
382 if ((vdir->flags & VRING_DESC_F_NEXT) == 0)
388 "%s: descriptor loop? count > %d - driver confused?",
398 * Return the first n_chain request chains back to the available queue.
400 * (These chains are the ones you handled when you called vq_getchain()
401 * and used its positive return value.)
404 vq_retchains(struct vqueue_info *vq, uint16_t n_chains)
407 vq->vq_last_avail -= n_chains;
411 vq_relchain_prepare(struct vqueue_info *vq, uint16_t idx, uint32_t iolen)
413 struct vring_used *vuh;
414 struct vring_used_elem *vue;
419 * - mask is N-1 where N is a power of 2 so computes x % N
420 * - vuh points to the "used" data shared with guest
421 * - vue points to the "used" ring entry we want to update
423 mask = vq->vq_qsize - 1;
426 vue = &vuh->ring[vq->vq_next_used++ & mask];
432 vq_relchain_publish(struct vqueue_info *vq)
435 * Ensure the used descriptor is visible before updating the index.
436 * This is necessary on ISAs with memory ordering less strict than x86
437 * (and even on x86 to act as a compiler barrier).
439 atomic_thread_fence_rel();
440 vq->vq_used->idx = vq->vq_next_used;
444 * Return specified request chain to the guest, setting its I/O length
445 * to the provided value.
447 * (This chain is the one you handled when you called vq_getchain()
448 * and used its positive return value.)
451 vq_relchain(struct vqueue_info *vq, uint16_t idx, uint32_t iolen)
453 vq_relchain_prepare(vq, idx, iolen);
454 vq_relchain_publish(vq);
458 * Driver has finished processing "available" chains and calling
459 * vq_relchain on each one. If driver used all the available
460 * chains, used_all should be set.
462 * If the "used" index moved we may need to inform the guest, i.e.,
463 * deliver an interrupt. Even if the used index did NOT move we
464 * may need to deliver an interrupt, if the avail ring is empty and
465 * we are supposed to interrupt on empty.
467 * Note that used_all_avail is provided by the caller because it's
468 * a snapshot of the ring state when he decided to finish interrupt
469 * processing -- it's possible that descriptors became available after
470 * that point. (It's also typically a constant 1/True as well.)
473 vq_endchains(struct vqueue_info *vq, int used_all_avail)
475 struct virtio_softc *vs;
476 uint16_t event_idx, new_idx, old_idx;
480 * Interrupt generation: if we're using EVENT_IDX,
481 * interrupt if we've crossed the event threshold.
482 * Otherwise interrupt is generated if we added "used" entries,
483 * but suppressed by VRING_AVAIL_F_NO_INTERRUPT.
485 * In any case, though, if NOTIFY_ON_EMPTY is set and the
486 * entire avail was processed, we need to interrupt always.
489 old_idx = vq->vq_save_used;
490 vq->vq_save_used = new_idx = vq->vq_used->idx;
493 * Use full memory barrier between "idx" store from preceding
494 * vq_relchain() call and the loads from VQ_USED_EVENT_IDX() or
495 * "flags" field below.
497 atomic_thread_fence_seq_cst();
498 if (used_all_avail &&
499 (vs->vs_negotiated_caps & VIRTIO_F_NOTIFY_ON_EMPTY))
501 else if (vs->vs_negotiated_caps & VIRTIO_RING_F_EVENT_IDX) {
502 event_idx = VQ_USED_EVENT_IDX(vq);
504 * This calculation is per docs and the kernel
505 * (see src/sys/dev/virtio/virtio_ring.h).
507 intr = (uint16_t)(new_idx - event_idx - 1) <
508 (uint16_t)(new_idx - old_idx);
510 intr = new_idx != old_idx &&
511 !(vq->vq_avail->flags & VRING_AVAIL_F_NO_INTERRUPT);
514 vq_interrupt(vs, vq);
517 /* Note: these are in sorted order to make for a fast search */
518 static struct config_reg {
519 uint16_t cr_offset; /* register offset */
520 uint8_t cr_size; /* size (bytes) */
521 uint8_t cr_ro; /* true => reg is read only */
522 const char *cr_name; /* name of reg */
524 { VIRTIO_PCI_HOST_FEATURES, 4, 1, "HOST_FEATURES" },
525 { VIRTIO_PCI_GUEST_FEATURES, 4, 0, "GUEST_FEATURES" },
526 { VIRTIO_PCI_QUEUE_PFN, 4, 0, "QUEUE_PFN" },
527 { VIRTIO_PCI_QUEUE_NUM, 2, 1, "QUEUE_NUM" },
528 { VIRTIO_PCI_QUEUE_SEL, 2, 0, "QUEUE_SEL" },
529 { VIRTIO_PCI_QUEUE_NOTIFY, 2, 0, "QUEUE_NOTIFY" },
530 { VIRTIO_PCI_STATUS, 1, 0, "STATUS" },
531 { VIRTIO_PCI_ISR, 1, 0, "ISR" },
532 { VIRTIO_MSI_CONFIG_VECTOR, 2, 0, "CONFIG_VECTOR" },
533 { VIRTIO_MSI_QUEUE_VECTOR, 2, 0, "QUEUE_VECTOR" },
536 static inline struct config_reg *
537 vi_find_cr(int offset) {
539 struct config_reg *cr;
542 hi = sizeof(config_regs) / sizeof(*config_regs) - 1;
544 mid = (hi + lo) >> 1;
545 cr = &config_regs[mid];
546 if (cr->cr_offset == offset)
548 if (cr->cr_offset < offset)
557 * Handle pci config space reads.
558 * If it's to the MSI-X info, do that.
559 * If it's part of the virtio standard stuff, do that.
560 * Otherwise dispatch to the actual driver.
563 vi_pci_read(struct pci_devinst *pi, int baridx, uint64_t offset, int size)
565 struct virtio_softc *vs = pi->pi_arg;
566 struct virtio_consts *vc;
567 struct config_reg *cr;
568 uint64_t virtio_config_size, max;
574 if (vs->vs_flags & VIRTIO_USE_MSIX) {
575 if (baridx == pci_msix_table_bar(pi) ||
576 baridx == pci_msix_pba_bar(pi)) {
577 return (pci_emul_msix_tread(pi, offset, size));
581 /* XXX probably should do something better than just assert() */
585 pthread_mutex_lock(vs->vs_mtx);
589 value = size == 1 ? 0xff : size == 2 ? 0xffff : 0xffffffff;
591 if (size != 1 && size != 2 && size != 4)
594 virtio_config_size = VIRTIO_PCI_CONFIG_OFF(pci_msix_enabled(pi));
596 if (offset >= virtio_config_size) {
598 * Subtract off the standard size (including MSI-X
599 * registers if enabled) and dispatch to underlying driver.
600 * If that fails, fall into general code.
602 newoff = offset - virtio_config_size;
603 max = vc->vc_cfgsize ? vc->vc_cfgsize : 0x100000000;
604 if (newoff + size > max)
606 if (vc->vc_cfgread != NULL)
607 error = (*vc->vc_cfgread)(DEV_SOFTC(vs), newoff, size, &value);
615 cr = vi_find_cr(offset);
616 if (cr == NULL || cr->cr_size != size) {
618 /* offset must be OK, so size must be bad */
620 "%s: read from %s: bad size %d",
621 name, cr->cr_name, size);
624 "%s: read from bad offset/size %jd/%d",
625 name, (uintmax_t)offset, size);
631 case VIRTIO_PCI_HOST_FEATURES:
632 value = vc->vc_hv_caps;
634 case VIRTIO_PCI_GUEST_FEATURES:
635 value = vs->vs_negotiated_caps;
637 case VIRTIO_PCI_QUEUE_PFN:
638 if (vs->vs_curq < vc->vc_nvq)
639 value = vs->vs_queues[vs->vs_curq].vq_pfn;
641 case VIRTIO_PCI_QUEUE_NUM:
642 value = vs->vs_curq < vc->vc_nvq ?
643 vs->vs_queues[vs->vs_curq].vq_qsize : 0;
645 case VIRTIO_PCI_QUEUE_SEL:
648 case VIRTIO_PCI_QUEUE_NOTIFY:
651 case VIRTIO_PCI_STATUS:
652 value = vs->vs_status;
656 vs->vs_isr = 0; /* a read clears this flag */
658 pci_lintr_deassert(pi);
660 case VIRTIO_MSI_CONFIG_VECTOR:
661 value = vs->vs_msix_cfg_idx;
663 case VIRTIO_MSI_QUEUE_VECTOR:
664 value = vs->vs_curq < vc->vc_nvq ?
665 vs->vs_queues[vs->vs_curq].vq_msix_idx :
666 VIRTIO_MSI_NO_VECTOR;
671 pthread_mutex_unlock(vs->vs_mtx);
676 * Handle pci config space writes.
677 * If it's to the MSI-X info, do that.
678 * If it's part of the virtio standard stuff, do that.
679 * Otherwise dispatch to the actual driver.
682 vi_pci_write(struct pci_devinst *pi, int baridx, uint64_t offset, int size,
685 struct virtio_softc *vs = pi->pi_arg;
686 struct vqueue_info *vq;
687 struct virtio_consts *vc;
688 struct config_reg *cr;
689 uint64_t virtio_config_size, max;
694 if (vs->vs_flags & VIRTIO_USE_MSIX) {
695 if (baridx == pci_msix_table_bar(pi) ||
696 baridx == pci_msix_pba_bar(pi)) {
697 pci_emul_msix_twrite(pi, offset, size, value);
702 /* XXX probably should do something better than just assert() */
706 pthread_mutex_lock(vs->vs_mtx);
711 if (size != 1 && size != 2 && size != 4)
714 virtio_config_size = VIRTIO_PCI_CONFIG_OFF(pci_msix_enabled(pi));
716 if (offset >= virtio_config_size) {
718 * Subtract off the standard size (including MSI-X
719 * registers if enabled) and dispatch to underlying driver.
721 newoff = offset - virtio_config_size;
722 max = vc->vc_cfgsize ? vc->vc_cfgsize : 0x100000000;
723 if (newoff + size > max)
725 if (vc->vc_cfgwrite != NULL)
726 error = (*vc->vc_cfgwrite)(DEV_SOFTC(vs), newoff, size, value);
734 cr = vi_find_cr(offset);
735 if (cr == NULL || cr->cr_size != size || cr->cr_ro) {
737 /* offset must be OK, wrong size and/or reg is R/O */
738 if (cr->cr_size != size)
740 "%s: write to %s: bad size %d",
741 name, cr->cr_name, size);
744 "%s: write to read-only reg %s",
748 "%s: write to bad offset/size %jd/%d",
749 name, (uintmax_t)offset, size);
755 case VIRTIO_PCI_GUEST_FEATURES:
756 vs->vs_negotiated_caps = value & vc->vc_hv_caps;
757 if (vc->vc_apply_features)
758 (*vc->vc_apply_features)(DEV_SOFTC(vs),
759 vs->vs_negotiated_caps);
761 case VIRTIO_PCI_QUEUE_PFN:
762 if (vs->vs_curq >= vc->vc_nvq)
764 vi_vq_init(vs, value);
766 case VIRTIO_PCI_QUEUE_SEL:
768 * Note that the guest is allowed to select an
769 * invalid queue; we just need to return a QNUM
770 * of 0 while the bad queue is selected.
774 case VIRTIO_PCI_QUEUE_NOTIFY:
775 if (value >= (unsigned int)vc->vc_nvq) {
776 EPRINTLN("%s: queue %d notify out of range",
780 vq = &vs->vs_queues[value];
782 (*vq->vq_notify)(DEV_SOFTC(vs), vq);
783 else if (vc->vc_qnotify)
784 (*vc->vc_qnotify)(DEV_SOFTC(vs), vq);
787 "%s: qnotify queue %d: missing vq/vc notify",
790 case VIRTIO_PCI_STATUS:
791 vs->vs_status = value;
793 (*vc->vc_reset)(DEV_SOFTC(vs));
795 case VIRTIO_MSI_CONFIG_VECTOR:
796 vs->vs_msix_cfg_idx = value;
798 case VIRTIO_MSI_QUEUE_VECTOR:
799 if (vs->vs_curq >= vc->vc_nvq)
801 vq = &vs->vs_queues[vs->vs_curq];
802 vq->vq_msix_idx = value;
809 "%s: write config reg %s: curq %d >= max %d",
810 name, cr->cr_name, vs->vs_curq, vc->vc_nvq);
813 pthread_mutex_unlock(vs->vs_mtx);
816 #ifdef BHYVE_SNAPSHOT
818 vi_pci_pause(struct pci_devinst *pi)
820 struct virtio_softc *vs;
821 struct virtio_consts *vc;
827 assert(vc->vc_pause != NULL);
828 (*vc->vc_pause)(DEV_SOFTC(vs));
834 vi_pci_resume(struct pci_devinst *pi)
836 struct virtio_softc *vs;
837 struct virtio_consts *vc;
843 assert(vc->vc_resume != NULL);
844 (*vc->vc_resume)(DEV_SOFTC(vs));
850 vi_pci_snapshot_softc(struct virtio_softc *vs, struct vm_snapshot_meta *meta)
854 SNAPSHOT_VAR_OR_LEAVE(vs->vs_flags, meta, ret, done);
855 SNAPSHOT_VAR_OR_LEAVE(vs->vs_negotiated_caps, meta, ret, done);
856 SNAPSHOT_VAR_OR_LEAVE(vs->vs_curq, meta, ret, done);
857 SNAPSHOT_VAR_OR_LEAVE(vs->vs_status, meta, ret, done);
858 SNAPSHOT_VAR_OR_LEAVE(vs->vs_isr, meta, ret, done);
859 SNAPSHOT_VAR_OR_LEAVE(vs->vs_msix_cfg_idx, meta, ret, done);
866 vi_pci_snapshot_consts(struct virtio_consts *vc, struct vm_snapshot_meta *meta)
870 SNAPSHOT_VAR_CMP_OR_LEAVE(vc->vc_nvq, meta, ret, done);
871 SNAPSHOT_VAR_CMP_OR_LEAVE(vc->vc_cfgsize, meta, ret, done);
872 SNAPSHOT_VAR_CMP_OR_LEAVE(vc->vc_hv_caps, meta, ret, done);
879 vi_pci_snapshot_queues(struct virtio_softc *vs, struct vm_snapshot_meta *meta)
883 struct virtio_consts *vc;
884 struct vqueue_info *vq;
888 ctx = vs->vs_pi->pi_vmctx;
891 /* Save virtio queue info */
892 for (i = 0; i < vc->vc_nvq; i++) {
893 vq = &vs->vs_queues[i];
895 SNAPSHOT_VAR_CMP_OR_LEAVE(vq->vq_qsize, meta, ret, done);
896 SNAPSHOT_VAR_CMP_OR_LEAVE(vq->vq_num, meta, ret, done);
898 SNAPSHOT_VAR_OR_LEAVE(vq->vq_flags, meta, ret, done);
899 SNAPSHOT_VAR_OR_LEAVE(vq->vq_last_avail, meta, ret, done);
900 SNAPSHOT_VAR_OR_LEAVE(vq->vq_next_used, meta, ret, done);
901 SNAPSHOT_VAR_OR_LEAVE(vq->vq_save_used, meta, ret, done);
902 SNAPSHOT_VAR_OR_LEAVE(vq->vq_msix_idx, meta, ret, done);
904 SNAPSHOT_VAR_OR_LEAVE(vq->vq_pfn, meta, ret, done);
906 if (!vq_ring_ready(vq))
909 addr_size = vq->vq_qsize * sizeof(struct vring_desc);
910 SNAPSHOT_GUEST2HOST_ADDR_OR_LEAVE(ctx, vq->vq_desc, addr_size,
911 false, meta, ret, done);
913 addr_size = (2 + vq->vq_qsize + 1) * sizeof(uint16_t);
914 SNAPSHOT_GUEST2HOST_ADDR_OR_LEAVE(ctx, vq->vq_avail, addr_size,
915 false, meta, ret, done);
917 addr_size = (2 + 2 * vq->vq_qsize + 1) * sizeof(uint16_t);
918 SNAPSHOT_GUEST2HOST_ADDR_OR_LEAVE(ctx, vq->vq_used, addr_size,
919 false, meta, ret, done);
921 SNAPSHOT_BUF_OR_LEAVE(vq->vq_desc,
922 vring_size_aligned(vq->vq_qsize), meta, ret, done);
930 vi_pci_snapshot(struct vm_snapshot_meta *meta)
933 struct pci_devinst *pi;
934 struct virtio_softc *vs;
935 struct virtio_consts *vc;
941 /* Save virtio softc */
942 ret = vi_pci_snapshot_softc(vs, meta);
946 /* Save virtio consts */
947 ret = vi_pci_snapshot_consts(vc, meta);
951 /* Save virtio queue info */
952 ret = vi_pci_snapshot_queues(vs, meta);
956 /* Save device softc, if needed */
957 if (vc->vc_snapshot != NULL) {
958 ret = (*vc->vc_snapshot)(DEV_SOFTC(vs), meta);