Initial support for kernel 6.4
https://www.virtualbox.org/changeset/99666/vbox

--- a/src/VBox/Additions/linux/sharedfolders/regops.c
+++ b/src/VBox/Additions/linux/sharedfolders/regops.c
@@ -75,4 +75,11 @@
 #if RTLNX_VER_MAX(2,5,12)
 # define PageUptodate(a_pPage) Page_Uptodate(a_pPage)
+#endif
+
+/** Starting from 6.4.0, iter_iov() macro should be used in order to access to iov field.  */
+#if RTLNX_VER_MIN(6,4,0)
+# define VBOX_ITER_IOV(_iter) iter_iov(_iter)
+#else
+# define VBOX_ITER_IOV(_iter) iter->iov
 #endif
 
@@ -2400,5 +2407,5 @@
     if (iter_is_iovec(iter) || (VBSF_GET_ITER_TYPE(iter) & ITER_KVEC)) {
 # endif
-        const struct iovec *pCurIov    = iter->iov;
+        const struct iovec *pCurIov    = VBOX_ITER_IOV(iter);
         size_t              cLeft      = iter->nr_segs;
         size_t              cPagesSpan = 0;