D31620.diff
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	diff --git a/sys/dev/virtio/virtqueue.c b/sys/dev/virtio/virtqueue.c
	--- a/sys/dev/virtio/virtqueue.c
	+++ b/sys/dev/virtio/virtqueue.c
	@@ -38,6 +38,7 @@
	#include <sys/systm.h>
	#include <sys/kernel.h>
	#include <sys/malloc.h>
	+#include <sys/sdt.h>
	#include <sys/sglist.h>
	#include <vm/vm.h>
	#include <vm/pmap.h>
	@@ -137,6 +138,11 @@
	static void vq_ring_notify_host(struct virtqueue *);
	static void vq_ring_free_chain(struct virtqueue *, uint16_t);

	+SDT_PROVIDER_DEFINE(virtqueue);
	+SDT_PROBE_DEFINE6(virtqueue, , enqueue_segments, entry, "struct virtqueue *",
	+ "struct vring_desc ", "uint16_t", "struct sglist ", "int", "int");
	+SDT_PROBE_DEFINE1(virtqueue, , enqueue_segments, return, "uint16_t");
	+
	#define vq_modern(_vq) (((_vq)->vq_flags & VIRTQUEUE_FLAG_MODERN) != 0)
	#define vq_htog16(_vq, _val) virtio_htog16(vq_modern(_vq), _val)
	#define vq_htog32(_vq, _val) virtio_htog32(vq_modern(_vq), _val)
	@@ -703,6 +709,9 @@
	int i, needed;
	uint16_t idx;

	+ SDT_PROBE6(virtqueue, , enqueue_segments, entry, vq, desc, head_idx,
	+ sg, readable, writable);
	+
	needed = readable + writable;

	for (i = 0, idx = head_idx, seg = sg->sg_segs;
	@@ -722,6 +731,7 @@
	dp->flags \|= vq_gtoh16(vq, VRING_DESC_F_WRITE);
	}

	+ SDT_PROBE1(virtqueue, , enqueue_segments, return, idx);
	return (idx);
	}