diff --git a/include/sys/nvpair.h b/include/sys/nvpair.h
index 09b3a81f7c..548e5a72e4 100644
--- a/include/sys/nvpair.h
+++ b/include/sys/nvpair.h
@@ -310,7 +310,9 @@ _SYS_NVPAIR_H int nvpair_value_double(const nvpair_t *, double *);
 _SYS_NVPAIR_H nvlist_t *fnvlist_alloc(void);
 _SYS_NVPAIR_H void fnvlist_free(nvlist_t *);
 _SYS_NVPAIR_H size_t fnvlist_size(nvlist_t *);
+_SYS_NVPAIR_H size_t fnvlist_size_xdr(nvlist_t *);
 _SYS_NVPAIR_H char *fnvlist_pack(nvlist_t *, size_t *);
+_SYS_NVPAIR_H char *fnvlist_pack_xdr(nvlist_t *, size_t *);
 _SYS_NVPAIR_H void fnvlist_pack_free(char *, size_t);
 _SYS_NVPAIR_H nvlist_t *fnvlist_unpack(char *, size_t);
 _SYS_NVPAIR_H nvlist_t *fnvlist_dup(const nvlist_t *);
diff --git a/module/nvpair/fnvpair.c b/module/nvpair/fnvpair.c
index 86b0b4cdfc..301346e73d 100644
--- a/module/nvpair/fnvpair.c
+++ b/module/nvpair/fnvpair.c
@@ -69,6 +69,14 @@ fnvlist_size(nvlist_t *nvl)
 	return (size);
 }
 
+size_t
+fnvlist_size_xdr(nvlist_t *nvl)
+{
+	size_t size;
+	VERIFY0(nvlist_size(nvl, &size, NV_ENCODE_XDR));
+	return (size);
+}
+
 /*
  * Returns allocated buffer of size *sizep.  Caller must free the buffer with
  * fnvlist_pack_free().
@@ -82,6 +90,15 @@ fnvlist_pack(nvlist_t *nvl, size_t *sizep)
 	return (packed);
 }
 
+char *
+fnvlist_pack_xdr(nvlist_t *nvl, size_t *sizep)
+{
+	char *packed = 0;
+	VERIFY3U(nvlist_pack(nvl, &packed, sizep, NV_ENCODE_XDR,
+	    KM_SLEEP), ==, 0);
+	return (packed);
+}
+
 void
 fnvlist_pack_free(char *pack, size_t size)
 {