diff --git a/sys/kern/subr_bus_dma.c b/sys/kern/subr_bus_dma.c
--- a/sys/kern/subr_bus_dma.c
+++ b/sys/kern/subr_bus_dma.c
@@ -38,7 +38,6 @@
 #include <sys/param.h>
 #include <sys/conf.h>
 #include <sys/systm.h>
-#include <sys/bio.h>
 #include <sys/bus.h>
 #include <sys/callout.h>
 #include <sys/ktr.h>
@@ -259,29 +258,6 @@
 	return (error);
 }
 
-/*
- * Load from block io.
- */
-static int
-_bus_dmamap_load_bio(bus_dma_tag_t dmat, bus_dmamap_t map, struct bio *bio,
-    int *nsegs, int flags)
-{
-
-	if ((bio->bio_flags & BIO_VLIST) != 0) {
-		bus_dma_segment_t *segs = (bus_dma_segment_t *)bio->bio_data;
-		return (_bus_dmamap_load_vlist(dmat, map, segs, bio->bio_ma_n,
-		    kernel_pmap, nsegs, flags, bio->bio_ma_offset,
-		    bio->bio_bcount));
-	}
-
-	if ((bio->bio_flags & BIO_UNMAPPED) != 0)
-		return (_bus_dmamap_load_ma(dmat, map, bio->bio_ma,
-		    bio->bio_bcount, bio->bio_ma_offset, flags, NULL, nsegs));
-
-	return (_bus_dmamap_load_buffer(dmat, map, bio->bio_data,
-	    bio->bio_bcount, kernel_pmap, flags, NULL, nsegs));
-}
-
 int
 bus_dmamap_load_ma_triv(bus_dma_tag_t dmat, bus_dmamap_t map,
     struct vm_page **ma, bus_size_t tlen, int ma_offs, int flags,
@@ -497,43 +473,11 @@
 		    bus_dmamap_callback_t *callback, void *callback_arg,
 		    int flags)
 {
-	bus_dma_segment_t *segs;
 	struct memdesc mem;
-	int error;
-	int nsegs;
 
-#ifdef KMSAN
 	mem = memdesc_bio(bio);
-	_bus_dmamap_load_kmsan(dmat, map, &mem);
-#endif
-
-	if ((flags & BUS_DMA_NOWAIT) == 0) {
-		mem = memdesc_bio(bio);
-		_bus_dmamap_waitok(dmat, map, &mem, callback, callback_arg);
-	}
-	nsegs = -1;
-	error = _bus_dmamap_load_bio(dmat, map, bio, &nsegs, flags);
-	nsegs++;
-
-	CTR5(KTR_BUSDMA, "%s: tag %p tag flags 0x%x error %d nsegs %d",
-	    __func__, dmat, flags, error, nsegs);
-
-	if (error == EINPROGRESS)
-		return (error);
-
-	segs = _bus_dmamap_complete(dmat, map, NULL, nsegs, error);
-	if (error)
-		(*callback)(callback_arg, segs, 0, error);
-	else
-		(*callback)(callback_arg, segs, nsegs, error);
-	/*
-	 * Return ENOMEM to the caller so that it can pass it up the stack.
-	 * This error only happens when NOWAIT is set, so deferral is disabled.
-	 */
-	if (error == ENOMEM)
-		return (error);
-
-	return (0);
+	return (bus_dmamap_load_mem(dmat, map, &mem, callback, callback_arg,
+	    flags));
 }
 
 int
@@ -571,10 +515,6 @@
 		error = _bus_dmamap_load_plist(dmat, map, mem->u.md_list,
 		    mem->md_nseg, &nsegs, flags);
 		break;
-	case MEMDESC_BIO:
-		error = _bus_dmamap_load_bio(dmat, map, mem->u.md_bio,
-		    &nsegs, flags);
-		break;
 	case MEMDESC_UIO:
 		error = _bus_dmamap_load_uio(dmat, map, mem->u.md_uio,
 		    &nsegs, flags);
diff --git a/sys/kern/subr_msan.c b/sys/kern/subr_msan.c
--- a/sys/kern/subr_msan.c
+++ b/sys/kern/subr_msan.c
@@ -1508,9 +1508,6 @@
 			kmsan_check(desc->u.md_vaddr, desc->md_len,
 			    "dmasync");
 			break;
-		case MEMDESC_BIO:
-			kmsan_check_bio(desc->u.md_bio, "dmasync");
-			break;
 		case MEMDESC_MBUF:
 			kmsan_check_mbuf(desc->u.md_mbuf, "dmasync");
 			break;
@@ -1527,9 +1524,6 @@
 			kmsan_mark(desc->u.md_vaddr, desc->md_len,
 			    KMSAN_STATE_INITED);
 			break;
-		case MEMDESC_BIO:
-			kmsan_mark_bio(desc->u.md_bio, KMSAN_STATE_INITED);
-			break;
 		case MEMDESC_MBUF:
 			kmsan_mark_mbuf(desc->u.md_mbuf, KMSAN_STATE_INITED);
 			break;
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
--- a/sys/kern/vfs_bio.c
+++ b/sys/kern/vfs_bio.c
@@ -63,6 +63,7 @@
 #include <sys/limits.h>
 #include <sys/lock.h>
 #include <sys/malloc.h>
+#include <sys/memdesc.h>
 #include <sys/mount.h>
 #include <sys/mutex.h>
 #include <sys/kernel.h>
@@ -5233,6 +5234,20 @@
 	}
 }
 
+struct memdesc
+memdesc_bio(struct bio *bio)
+{
+	if ((bio->bio_flags & BIO_VLIST) != 0)
+		return (memdesc_vlist((struct bus_dma_segment *)bio->bio_data,
+		    bio->bio_ma_n));
+
+	if ((bio->bio_flags & BIO_UNMAPPED) != 0)
+		return (memdesc_vmpages(bio->bio_ma, bio->bio_bcount,
+		    bio->bio_ma_offset));
+
+	return (memdesc_vaddr(bio->bio_data, bio->bio_bcount));
+}
+
 static int buf_pager_relbuf;
 SYSCTL_INT(_vfs, OID_AUTO, buf_pager_relbuf, CTLFLAG_RWTUN,
     &buf_pager_relbuf, 0,
diff --git a/sys/sys/memdesc.h b/sys/sys/memdesc.h
--- a/sys/sys/memdesc.h
+++ b/sys/sys/memdesc.h
@@ -47,7 +47,6 @@
 		void			*md_vaddr;
 		vm_paddr_t		md_paddr;
 		struct bus_dma_segment	*md_list;
-		struct bio		*md_bio;
 		struct uio		*md_uio;
 		struct mbuf		*md_mbuf;
 		struct vm_page 		**md_ma;
@@ -66,7 +65,6 @@
 #define	MEMDESC_PADDR	2	/* Contiguous physical address. */
 #define	MEMDESC_VLIST	3	/* scatter/gather list of kva addresses. */
 #define	MEMDESC_PLIST	4	/* scatter/gather list of physical addresses. */
-#define	MEMDESC_BIO	5	/* Pointer to a bio (block io). */
 #define	MEMDESC_UIO	6	/* Pointer to a uio (any io). */
 #define	MEMDESC_MBUF	7	/* Pointer to a mbuf (network io). */
 #define	MEMDESC_VMPAGES	8	/* Pointer to array of VM pages. */
@@ -119,17 +117,6 @@
 	return (mem);
 }
 
-static inline struct memdesc
-memdesc_bio(struct bio *bio)
-{
-	struct memdesc mem;
-
-	mem.u.md_bio = bio;
-	mem.md_type = MEMDESC_BIO;
-
-	return (mem);
-}
-
 static inline struct memdesc
 memdesc_uio(struct uio *uio)
 {
@@ -165,6 +152,7 @@
 	return (mem);
 }
 
+struct memdesc	memdesc_bio(struct bio *bio);
 struct memdesc	memdesc_ccb(union ccb *ccb);
 
 #endif /* _SYS_MEMDESC_H_ */