Some parts of the iovec API were replaced by the similar message API. Refactoring the code to use that.
diff -rupN vsock-only/linux/af_vsock.c vsock-only.new/linux/af_vsock.c
--- vsock-only/linux/af_vsock.c	2015-05-05 11:31:35.710099711 -0400
+++ vsock-only.new/linux/af_vsock.c	2015-05-05 11:36:33.260115840 -0400
@@ -4727,7 +4727,11 @@ VSockVmciDgramRecvmsg(struct kiocb *kioc
    }
 
    /* Place the datagram payload in the user's iovec. */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0)
    err = skb_copy_datagram_iovec(skb, sizeof *dg, msg->msg_iov, payloadLen);
+#else
+   err = skb_copy_datagram_iter(skb, sizeof *dg, &msg->msg_iter, payloadLen);
+#endif
    if (err) {
       goto out;
    }