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	diff --git a/usr.sbin/bhyve/pci_virtio_scsi.c b/usr.sbin/bhyve/pci_virtio_scsi.c
	--- a/usr.sbin/bhyve/pci_virtio_scsi.c
	+++ b/usr.sbin/bhyve/pci_virtio_scsi.c
	@@ -102,13 +102,17 @@
	uint32_t max_lun;
	} __attribute__((packed));

	+STAILQ_HEAD(pci_vtscsi_req_queue, pci_vtscsi_request);
	+
	struct pci_vtscsi_queue {
	struct pci_vtscsi_softc * vsq_sc;
	struct vqueue_info * vsq_vq;
	- pthread_mutex_t vsq_mtx;
	+ pthread_mutex_t vsq_rmtx;
	+ pthread_mutex_t vsq_fmtx;
	pthread_mutex_t vsq_qmtx;
	pthread_cond_t vsq_cv;
	- STAILQ_HEAD(, pci_vtscsi_request) vsq_requests;
	+ struct pci_vtscsi_req_queue vsq_requests;
	+ struct pci_vtscsi_req_queue vsq_free_requests;
	LIST_HEAD(, pci_vtscsi_worker) vsq_workers;
	};

	@@ -124,8 +128,15 @@
	struct iovec vsr_iov[VTSCSI_MAXSEG + SPLIT_IOV_ADDL_IOV];
	struct iovec * vsr_iov_in;
	struct iovec * vsr_iov_out;
	+ struct iovec * vsr_data_iov_in;
	+ struct iovec * vsr_data_iov_out;
	+ struct pci_vtscsi_req_cmd_rd * vsr_cmd_rd;
	+ struct pci_vtscsi_req_cmd_wr * vsr_cmd_wr;
	+ union ctl_io * vsr_ctl_io;
	size_t vsr_niov_in;
	size_t vsr_niov_out;
	+ size_t vsr_data_niov_in;
	+ size_t vsr_data_niov_out;
	uint32_t vsr_idx;
	STAILQ_ENTRY(pci_vtscsi_request) vsr_link;
	};
	@@ -237,8 +248,21 @@
	struct pci_vtscsi_ctrl_tmf *);
	static void pci_vtscsi_an_handle(struct pci_vtscsi_softc *,
	struct pci_vtscsi_ctrl_an *);
	-static int pci_vtscsi_request_handle(struct pci_vtscsi_queue , struct iovec ,
	- size_t, struct iovec *, size_t);
	+
	+static struct pci_vtscsi_request *pci_vtscsi_alloc_request(
	+ struct pci_vtscsi_softc *);
	+static void pci_vtscsi_free_request(struct pci_vtscsi_request *);
	+static struct pci_vtscsi_request *pci_vtscsi_get_request(
	+ struct pci_vtscsi_req_queue *);
	+static void pci_vtscsi_put_request(struct pci_vtscsi_req_queue *,
	+ struct pci_vtscsi_request *);
	+static void pci_vtscsi_queue_request(struct pci_vtscsi_softc *,
	+ struct vqueue_info *);
	+static void pci_vtscsi_return_request(struct pci_vtscsi_queue *,
	+ struct pci_vtscsi_request *, int);
	+static int pci_vtscsi_request_handle(struct pci_vtscsi_softc *,
	+ struct pci_vtscsi_request *);
	+
	static void pci_vtscsi_controlq_notify(void , struct vqueue_info );
	static void pci_vtscsi_eventq_notify(void , struct vqueue_info );
	static void pci_vtscsi_requestq_notify(void , struct vqueue_info );
	@@ -262,37 +286,33 @@
	{
	struct pci_vtscsi_worker worker = (struct pci_vtscsi_worker )arg;
	struct pci_vtscsi_queue *q = worker->vsw_queue;
	- struct pci_vtscsi_request *req;
	+ struct pci_vtscsi_softc *sc = q->vsq_sc;
	int iolen;

	for (;;) {
	- pthread_mutex_lock(&q->vsq_mtx);
	+ struct pci_vtscsi_request *req;

	- while (STAILQ_EMPTY(&q->vsq_requests)
	- && !worker->vsw_exiting)
	- pthread_cond_wait(&q->vsq_cv, &q->vsq_mtx);
	+ pthread_mutex_lock(&q->vsq_rmtx);

	- if (worker->vsw_exiting)
	- break;
	+ while (STAILQ_EMPTY(&q->vsq_requests) && !worker->vsw_exiting)
	+ pthread_cond_wait(&q->vsq_cv, &q->vsq_rmtx);

	- req = STAILQ_FIRST(&q->vsq_requests);
	- STAILQ_REMOVE_HEAD(&q->vsq_requests, vsr_link);
	+ if (worker->vsw_exiting) {
	+ pthread_mutex_unlock(&q->vsq_rmtx);
	+ return (NULL);
	+ }

	- pthread_mutex_unlock(&q->vsq_mtx);
	- iolen = pci_vtscsi_request_handle(q, req->vsr_iov_in,
	- req->vsr_niov_in, req->vsr_iov_out, req->vsr_niov_out);
	+ req = pci_vtscsi_get_request(&q->vsq_requests);
	+ pthread_mutex_unlock(&q->vsq_rmtx);

	- pthread_mutex_lock(&q->vsq_qmtx);
	- vq_relchain(q->vsq_vq, req->vsr_idx, iolen);
	- vq_endchains(q->vsq_vq, 0);
	- pthread_mutex_unlock(&q->vsq_qmtx);
	+ DPRINTF("I/O request lun %d, data_niov_in %zu, data_niov_out "
	+ "%zu", pci_vtscsi_get_lun(req->vsr_cmd_rd->lun),
	+ req->vsr_data_niov_in, req->vsr_data_niov_out);

	- DPRINTF("request <idx=%d> completed", req->vsr_idx);
	- free(req);
	- }
	+ iolen = pci_vtscsi_request_handle(sc, req);

	- pthread_mutex_unlock(&q->vsq_mtx);
	- return (NULL);
	+ pci_vtscsi_return_request(q, req, iolen);
	+ }
	}

	static void
	@@ -395,6 +415,14 @@
	int err;

	io = ctl_scsi_alloc_io(sc->vss_iid);
	+ if (io == NULL) {
	+ WPRINTF("failed to allocate ctl_io: err=%d (%s)",
	+ errno, strerror(errno));
	+
	+ tmf->response = VIRTIO_SCSI_S_FAILURE;
	+ return;
	+ }
	+
	ctl_scsi_zero_io(io);

	io->io_hdr.io_type = CTL_IO_TASK;
	@@ -460,34 +488,112 @@
	{
	}

	-static int
	-pci_vtscsi_request_handle(struct pci_vtscsi_queue q, struct iovec iov_in,
	- size_t niov_in, struct iovec *iov_out, size_t niov_out)
	+static struct pci_vtscsi_request *
	+pci_vtscsi_alloc_request(struct pci_vtscsi_softc *sc)
	{
	- struct pci_vtscsi_softc *sc = q->vsq_sc;
	- struct pci_vtscsi_req_cmd_rd *cmd_rd = NULL;
	- struct pci_vtscsi_req_cmd_wr *cmd_wr;
	- struct iovec data_iov_in, data_iov_out;
	- union ctl_io *io;
	- size_t data_niov_in, data_niov_out;
	- void *ext_data_ptr = NULL;
	- uint32_t ext_data_len = 0, ext_sg_entries = 0;
	- int err, nxferred;
	+ struct pci_vtscsi_request *req;
	+
	+ req = calloc(1, sizeof(struct pci_vtscsi_request));
	+ if (req == NULL)
	+ goto alloc_fail;
	+
	+ req->vsr_cmd_rd = calloc(1, VTSCSI_IN_HEADER_LEN(sc));
	+ if (req->vsr_cmd_rd == NULL)
	+ goto alloc_fail;
	+ req->vsr_cmd_wr = calloc(1, VTSCSI_OUT_HEADER_LEN(sc));
	+ if (req->vsr_cmd_wr == NULL)
	+ goto alloc_fail;
	+
	+ req->vsr_ctl_io = ctl_scsi_alloc_io(sc->vss_iid);
	+ if (req->vsr_ctl_io == NULL)
	+ goto alloc_fail;
	+ ctl_scsi_zero_io(req->vsr_ctl_io);
	+
	+ return (req);
	+
	+alloc_fail:
	+ EPRINTLN("failed to allocate request: %s", strerror(errno));
	+
	+ if (req != NULL)
	+ pci_vtscsi_free_request(req);
	+
	+ return (NULL);
	+}
	+
	+static void
	+pci_vtscsi_free_request(struct pci_vtscsi_request *req)
	+{
	+ if (req->vsr_ctl_io != NULL)
	+ ctl_scsi_free_io(req->vsr_ctl_io);
	+ if (req->vsr_cmd_rd != NULL)
	+ free(req->vsr_cmd_rd);
	+ if (req->vsr_cmd_wr != NULL)
	+ free(req->vsr_cmd_wr);
	+
	+ free(req);
	+}
	+
	+static struct pci_vtscsi_request *
	+pci_vtscsi_get_request(struct pci_vtscsi_req_queue *req_queue)
	+{
	+ struct pci_vtscsi_request *req;
	+
	+ assert(!STAILQ_EMPTY(req_queue));
	+
	+ req = STAILQ_FIRST(req_queue);
	+ STAILQ_REMOVE_HEAD(req_queue, vsr_link);
	+
	+ return (req);
	+}
	+
	+static void
	+pci_vtscsi_put_request(struct pci_vtscsi_req_queue *req_queue,
	+ struct pci_vtscsi_request *req)
	+{
	+ STAILQ_INSERT_TAIL(req_queue, req, vsr_link);
	+}
	+
	+static void
	+pci_vtscsi_queue_request(struct pci_vtscsi_softc sc, struct vqueue_info vq)
	+{
	+ struct pci_vtscsi_queue *q = &sc->vss_queues[vq->vq_num - 2];
	+ struct pci_vtscsi_request *req;
	+ struct vi_req vireq;
	+ int n;
	+
	+ pthread_mutex_lock(&q->vsq_fmtx);
	+ req = pci_vtscsi_get_request(&q->vsq_free_requests);
	+ assert(req != NULL);
	+ pthread_mutex_unlock(&q->vsq_fmtx);
	+
	+ n = vq_getchain(vq, req->vsr_iov, VTSCSI_MAXSEG, &vireq);
	+ assert(n >= 1 && n <= VTSCSI_MAXSEG);
	+
	+ req->vsr_idx = vireq.idx;
	+ req->vsr_queue = q;
	+ req->vsr_iov_in = &req->vsr_iov[0];
	+ req->vsr_niov_in = vireq.readable;
	+ req->vsr_iov_out = &req->vsr_iov[vireq.readable];
	+ req->vsr_niov_out = vireq.writable;

	/*
	* Make sure we got at least enough space for the VirtIO-SCSI
	* command headers. If not, return this request immediately.
	*/
	- if (check_iov_len(iov_out, niov_out,
	+ if (check_iov_len(req->vsr_iov_out, req->vsr_niov_out,
	VTSCSI_OUT_HEADER_LEN(q->vsq_sc)) == false) {
	WPRINTF("ignoring request with insufficient output");
	- return (0);
	+ req->vsr_cmd_wr->response = VIRTIO_SCSI_S_FAILURE;
	+ pci_vtscsi_return_request(q, req, 1);
	+ return;
	}

	- if (check_iov_len(iov_in, niov_in,
	+ if (check_iov_len(req->vsr_iov_in, req->vsr_niov_in,
	VTSCSI_IN_HEADER_LEN(q->vsq_sc)) == false) {
	WPRINTF("ignoring request with incomplete header");
	- return (0);
	+ req->vsr_cmd_wr->response = VIRTIO_SCSI_S_FAILURE;
	+ pci_vtscsi_return_request(q, req, 1);
	+ return;
	}

	/*
	@@ -500,8 +606,8 @@
	* by one to make room for a new iovec covering the first part of the
	* output data portion.
	*/
	- data_iov_out = split_iov(iov_out, &niov_out,
	- VTSCSI_OUT_HEADER_LEN(q->vsq_sc), &data_niov_out);
	+ req->vsr_data_iov_out = split_iov(req->vsr_iov_out, &req->vsr_niov_out,
	+ VTSCSI_OUT_HEADER_LEN(q->vsq_sc), &req->vsr_data_niov_out);

	/*
	* Similarly, to not overwrite the first iovec of the output section,
	@@ -509,43 +615,106 @@
	* cover the entire iovec array (both input and the already split output
	* sections).
	*/
	- niov_in += niov_out + data_niov_out;
	+ req->vsr_niov_in += req->vsr_niov_out + req->vsr_data_niov_out;

	- data_iov_in = split_iov(iov_in, &niov_in,
	- VTSCSI_IN_HEADER_LEN(q->vsq_sc), &data_niov_in);
	+ req->vsr_data_iov_in = split_iov(req->vsr_iov_in, &req->vsr_niov_in,
	+ VTSCSI_IN_HEADER_LEN(q->vsq_sc), &req->vsr_data_niov_in);

	/*
	* And of course we now have to adjust data_niov_in accordingly.
	*/
	- data_niov_in -= niov_out + data_niov_out;
	+ req->vsr_data_niov_in -= req->vsr_niov_out + req->vsr_data_niov_out;

	- iov_to_buf(iov_in, niov_in, (void **)&cmd_rd);
	+ /*
	+ * iov_to_buf() realloc()s the buffer given as 3rd argument to the
	+ * total size of all iovecs it will be copying. Since we've just
	+ * truncated it in split_iov(), we know that the size will be
	+ * VTSCSI_IN_HEADER_LEN(q->vsq_sc).
	+ *
	+ * Since we pre-allocated req->vsr_cmd_rd to this size, the realloc()
	+ * should never fail.
	+ *
	+ * This will have to change if we begin allowing config space writes
	+ * to change sense size.
	+ */
	+ assert(iov_to_buf(req->vsr_iov_in, req->vsr_niov_in,
	+ (void **)&req->vsr_cmd_rd) == VTSCSI_IN_HEADER_LEN(q->vsq_sc));

	- cmd_wr = calloc(1, VTSCSI_OUT_HEADER_LEN(sc));
	- io = ctl_scsi_alloc_io(sc->vss_iid);
	- ctl_scsi_zero_io(io);
	+ pthread_mutex_lock(&q->vsq_rmtx);
	+ pci_vtscsi_put_request(&q->vsq_requests, req);
	+ pthread_cond_signal(&q->vsq_cv);
	+ pthread_mutex_unlock(&q->vsq_rmtx);
	+
	+ DPRINTF("request <idx=%d> enqueued", vireq.idx);
	+}
	+
	+static void
	+pci_vtscsi_return_request(struct pci_vtscsi_queue *q,
	+ struct pci_vtscsi_request *req, int iolen)
	+{
	+ void *cmd_rd = req->vsr_cmd_rd;
	+ void *cmd_wr = req->vsr_cmd_wr;
	+ void *ctl_io = req->vsr_ctl_io;
	+ int idx = req->vsr_idx;
	+
	+ DPRINTF("request <idx=%d> completed, response %d", idx,
	+ req->vsr_cmd_wr->response);
	+
	+ iolen += buf_to_iov(cmd_wr, VTSCSI_OUT_HEADER_LEN(q->vsq_sc),
	+ req->vsr_iov_out, req->vsr_niov_out);
	+
	+ ctl_scsi_zero_io(req->vsr_ctl_io);
	+
	+ memset(cmd_rd, 0, VTSCSI_IN_HEADER_LEN(q->vsq_sc));
	+ memset(cmd_wr, 0, VTSCSI_OUT_HEADER_LEN(q->vsq_sc));
	+ memset(req, 0, sizeof(struct pci_vtscsi_request));
	+
	+ req->vsr_cmd_rd = cmd_rd;
	+ req->vsr_cmd_wr = cmd_wr;
	+ req->vsr_ctl_io = ctl_io;
	+
	+ pthread_mutex_lock(&q->vsq_fmtx);
	+ pci_vtscsi_put_request(&q->vsq_free_requests, req);
	+ pthread_mutex_unlock(&q->vsq_fmtx);
	+
	+ pthread_mutex_lock(&q->vsq_qmtx);
	+ vq_relchain(q->vsq_vq, idx, iolen);
	+ vq_endchains(q->vsq_vq, 0);
	+ pthread_mutex_unlock(&q->vsq_qmtx);
	+}
	+
	+static int
	+pci_vtscsi_request_handle(struct pci_vtscsi_softc *sc,
	+ struct pci_vtscsi_request *req)
	+{
	+ union ctl_io *io = req->vsr_ctl_io;
	+ void *ext_data_ptr = NULL;
	+ uint32_t ext_data_len = 0, ext_sg_entries = 0;
	+ int err, nxferred;

	io->io_hdr.nexus.initid = sc->vss_iid;
	- io->io_hdr.nexus.targ_lun = pci_vtscsi_get_lun(cmd_rd->lun);
	+ io->io_hdr.nexus.targ_lun = pci_vtscsi_get_lun(req->vsr_cmd_rd->lun);

	io->io_hdr.io_type = CTL_IO_SCSI;

	- if (data_niov_in > 0) {
	- ext_data_ptr = (void *)data_iov_in;
	- ext_sg_entries = data_niov_in;
	- ext_data_len = count_iov(data_iov_in, data_niov_in);
	+ if (req->vsr_data_niov_in > 0) {
	+ ext_data_ptr = (void *)req->vsr_data_iov_in;
	+ ext_sg_entries = req->vsr_data_niov_in;
	+ ext_data_len = count_iov(req->vsr_data_iov_in,
	+ req->vsr_data_niov_in);
	io->io_hdr.flags \|= CTL_FLAG_DATA_OUT;
	- } else if (data_niov_out > 0) {
	- ext_data_ptr = (void *)data_iov_out;
	- ext_sg_entries = data_niov_out;
	- ext_data_len = count_iov(data_iov_out, data_niov_out);
	+ } else if (req->vsr_data_niov_out > 0) {
	+ ext_data_ptr = (void *)req->vsr_data_iov_out;
	+ ext_sg_entries = req->vsr_data_niov_out;
	+ ext_data_len = count_iov(req->vsr_data_iov_out,
	+ req->vsr_data_niov_out);
	io->io_hdr.flags \|= CTL_FLAG_DATA_IN;
	}

	io->scsiio.sense_len = sc->vss_config.sense_size;
	- io->scsiio.tag_num = cmd_rd->id;
	+ io->scsiio.tag_num = req->vsr_cmd_rd->id;
	io->io_hdr.flags \|= CTL_FLAG_USER_TAG;
	- switch (cmd_rd->task_attr) {
	+ switch (req->vsr_cmd_rd->task_attr) {
	case VIRTIO_SCSI_S_ORDERED:
	io->scsiio.tag_type = CTL_TAG_ORDERED;
	break;
	@@ -565,7 +734,7 @@
	io->scsiio.ext_data_len = ext_data_len;
	io->scsiio.ext_data_filled = 0;
	io->scsiio.cdb_len = sc->vss_config.cdb_size;
	- memcpy(io->scsiio.cdb, cmd_rd->cdb, sc->vss_config.cdb_size);
	+ memcpy(io->scsiio.cdb, req->vsr_cmd_rd->cdb, sc->vss_config.cdb_size);

	if (pci_vtscsi_debug) {
	struct sbuf *sb = sbuf_new_auto();
	@@ -578,22 +747,19 @@
	err = ioctl(sc->vss_ctl_fd, CTL_IO, io);
	if (err != 0) {
	WPRINTF("CTL_IO: err=%d (%s)", errno, strerror(errno));
	- cmd_wr->response = VIRTIO_SCSI_S_FAILURE;
	+ req->vsr_cmd_wr->response = VIRTIO_SCSI_S_FAILURE;
	} else {
	- cmd_wr->sense_len = MIN(io->scsiio.sense_len,
	- sc->vss_config.sense_size);
	- cmd_wr->residual = ext_data_len - io->scsiio.ext_data_filled;
	- cmd_wr->status = io->scsiio.scsi_status;
	- cmd_wr->response = VIRTIO_SCSI_S_OK;
	- memcpy(&cmd_wr->sense, &io->scsiio.sense_data,
	- cmd_wr->sense_len);
	+ req->vsr_cmd_wr->sense_len =
	+ MIN(io->scsiio.sense_len, sc->vss_config.sense_size);
	+ req->vsr_cmd_wr->residual = ext_data_len -
	+ io->scsiio.ext_data_filled;
	+ req->vsr_cmd_wr->status = io->scsiio.scsi_status;
	+ req->vsr_cmd_wr->response = VIRTIO_SCSI_S_OK;
	+ memcpy(&req->vsr_cmd_wr->sense, &io->scsiio.sense_data,
	+ req->vsr_cmd_wr->sense_len);
	}

	- buf_to_iov(cmd_wr, VTSCSI_OUT_HEADER_LEN(sc), iov_out, niov_out);
	- nxferred = VTSCSI_OUT_HEADER_LEN(sc) + io->scsiio.ext_data_filled;
	- free(cmd_rd);
	- free(cmd_wr);
	- ctl_scsi_free_io(io);
	+ nxferred = io->scsiio.ext_data_filled;
	return (nxferred);
	}

	@@ -635,34 +801,8 @@
	static void
	pci_vtscsi_requestq_notify(void vsc, struct vqueue_info vq)
	{
	- struct pci_vtscsi_softc *sc;
	- struct pci_vtscsi_queue *q;
	- struct pci_vtscsi_request *req;
	- struct vi_req vireq;
	- int n;
	-
	- sc = vsc;
	- q = &sc->vss_queues[vq->vq_num - 2];
	-
	while (vq_has_descs(vq)) {
	- req = calloc(1, sizeof(struct pci_vtscsi_request));
	-
	- n = vq_getchain(vq, req->vsr_iov, VTSCSI_MAXSEG, &vireq);
	- assert(n >= 1 && n <= VTSCSI_MAXSEG);
	-
	- req->vsr_idx = vireq.idx;
	- req->vsr_queue = q;
	- req->vsr_iov_in = &req->vsr_iov[0];
	- req->vsr_niov_in = vireq.readable;
	- req->vsr_iov_out = &req->vsr_iov[vireq.readable];
	- req->vsr_niov_out = vireq.writable;
	-
	- pthread_mutex_lock(&q->vsq_mtx);
	- STAILQ_INSERT_TAIL(&q->vsq_requests, req, vsr_link);
	- pthread_cond_signal(&q->vsq_cv);
	- pthread_mutex_unlock(&q->vsq_mtx);
	-
	- DPRINTF("request <idx=%d> enqueued", vireq.idx);
	+ pci_vtscsi_queue_request(vsc, vq);
	}
	}

	@@ -670,21 +810,36 @@
	pci_vtscsi_init_queue(struct pci_vtscsi_softc *sc,
	struct pci_vtscsi_queue *queue, int num)
	{
	- struct pci_vtscsi_worker *worker;
	char tname[MAXCOMLEN + 1];
	int i;

	queue->vsq_sc = sc;
	queue->vsq_vq = &sc->vss_vq[num + 2];

	- pthread_mutex_init(&queue->vsq_mtx, NULL);
	+ pthread_mutex_init(&queue->vsq_rmtx, NULL);
	+ pthread_mutex_init(&queue->vsq_fmtx, NULL);
	pthread_mutex_init(&queue->vsq_qmtx, NULL);
	pthread_cond_init(&queue->vsq_cv, NULL);
	STAILQ_INIT(&queue->vsq_requests);
	+ STAILQ_INIT(&queue->vsq_free_requests);
	LIST_INIT(&queue->vsq_workers);

	+ for (i = 0; i < VTSCSI_RINGSZ; i++) {
	+ struct pci_vtscsi_request *req;
	+
	+ req = pci_vtscsi_alloc_request(sc);
	+ if (req == NULL)
	+ return (-1);
	+
	+ pci_vtscsi_put_request(&queue->vsq_free_requests, req);
	+ }
	+
	for (i = 0; i < VTSCSI_THR_PER_Q; i++) {
	+ struct pci_vtscsi_worker *worker;
	worker = calloc(1, sizeof(struct pci_vtscsi_worker));
	+ if (worker == NULL)
	+ return (-1);
	+
	worker->vsw_queue = queue;

	pthread_create(&worker->vsw_thread, NULL, &pci_vtscsi_proc,
	@@ -722,9 +877,13 @@
	{
	struct pci_vtscsi_softc *sc;
	const char devname, value;
	+ int err;
	int i;

	sc = calloc(1, sizeof(struct pci_vtscsi_softc));
	+ if (sc == NULL)
	+ return (-1);
	+
	value = get_config_value_node(nvl, "iid");
	if (value != NULL)
	sc->vss_iid = strtoul(value, NULL, 10);
	@@ -753,6 +912,19 @@
	vi_softc_linkup(&sc->vss_vs, &vtscsi_vi_consts, sc, pi, sc->vss_vq);
	sc->vss_vs.vs_mtx = &sc->vss_mtx;

	+ /*
	+ * Perform a "reset" before we set up our queues.
	+ *
	+ * This will write the default config into vss_config, which is used
	+ * by the rest of the driver to get the request header size. Note that
	+ * if we ever allow the guest to override sense size through config
	+ * space writes, pre-allocation of I/O requests will have to change
	+ * accordingly.
	+ */
	+ pthread_mutex_lock(&sc->vss_mtx);
	+ pci_vtscsi_reset(sc);
	+ pthread_mutex_unlock(&sc->vss_mtx);
	+
	/* controlq */
	sc->vss_vq[0].vq_qsize = VTSCSI_RINGSZ;
	sc->vss_vq[0].vq_notify = pci_vtscsi_controlq_notify;
	@@ -765,7 +937,10 @@
	for (i = 2; i < VTSCSI_MAXQ; i++) {
	sc->vss_vq[i].vq_qsize = VTSCSI_RINGSZ;
	sc->vss_vq[i].vq_notify = pci_vtscsi_requestq_notify;
	- pci_vtscsi_init_queue(sc, &sc->vss_queues[i - 2], i - 2);
	+
	+ err = pci_vtscsi_init_queue(sc, &sc->vss_queues[i - 2], i - 2);
	+ if (err != 0)
	+ return (err);
	}

	/* initialize config space */

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