diff --git a/Makefile b/Makefile
index ad1e627..d49b84e 100644
--- a/Makefile
+++ b/Makefile
@@ -40,7 +40,9 @@
 
 ifdef BUILD_DOCS
 DOCS=qemu-doc.html qemu-tech.html qemu.1 qemu-img.1 qemu-nbd.8 QMP/qmp-commands.txt
+ifdef CONFIG_VIRTFS
 DOCS+=fsdev/virtfs-proxy-helper.1
+endif
 else
 DOCS=
 endif
diff --git a/configure b/configure
index f9d5330..d9dde96 100755
--- a/configure
+++ b/configure
@@ -122,6 +122,7 @@
 fdt=""
 nptl=""
 sdl=""
+virtfs=""
 vnc="yes"
 sparse="no"
 uuid=""
@@ -597,6 +598,10 @@
   ;;
   --enable-sdl) sdl="yes"
   ;;
+  --disable-virtfs) virtfs="no"
+  ;;
+  --enable-virtfs) virtfs="yes"
+  ;;
   --disable-vnc) vnc="no"
   ;;
   --enable-vnc) vnc="yes"
@@ -1004,6 +1009,8 @@
 echo "  --disable-werror         disable compilation abort on warning"
 echo "  --disable-sdl            disable SDL"
 echo "  --enable-sdl             enable SDL"
+echo "  --disable-virtfs         disable VirtFS"
+echo "  --enable-virtfs          enable VirtFS"
 echo "  --disable-vnc            disable VNC"
 echo "  --enable-vnc             enable VNC"
 echo "  --enable-cocoa           enable COCOA (Mac OS X only)"
@@ -2820,8 +2827,15 @@
 tools=
 if test "$softmmu" = yes ; then
   tools="qemu-img\$(EXESUF) qemu-io\$(EXESUF) $tools"
-  if [ "$cap" = "yes" -a "$linux" = "yes" ] ; then
-      tools="$tools fsdev/virtfs-proxy-helper\$(EXESUF)"
+  if test "$virtfs" != no ; then
+      if test "$cap" = yes && test "$linux" = yes && test "$attr" = yes ; then
+	  virtfs=yes
+	  tools="$tools fsdev/virtfs-proxy-helper\$(EXESUF)"
+      else
+	  if test "$virtfs" = yes; then
+	      feature_not_found "virtfs"
+	  fi
+      fi
   fi
   if [ "$linux" = "yes" -o "$bsd" = "yes" -o "$solaris" = "yes" ] ; then
       tools="qemu-nbd\$(EXESUF) $tools"
@@ -2886,6 +2900,7 @@
 echo "Extra audio cards $audio_card_list"
 echo "Block whitelist   $block_drv_whitelist"
 echo "Mixer emulation   $mixemu"
+echo "VirtFS support    $virtfs"
 echo "VNC support       $vnc"
 if test "$vnc" = "yes" ; then
     echo "VNC TLS support   $vnc_tls"
@@ -3175,10 +3190,8 @@
 if test "$libattr" = "yes" ; then
   echo "CONFIG_LIBATTR=y" >> $config_host_mak
 fi
-if test "$linux" = "yes" ; then
-  if test "$attr" = "yes" ; then
-    echo "CONFIG_VIRTFS=y" >> $config_host_mak
-  fi
+if test "$virtfs" = "yes" ; then
+  echo "CONFIG_VIRTFS=y" >> $config_host_mak
 fi
 if test "$blobs" = "yes" ; then
   echo "INSTALL_BLOBS=yes" >> $config_host_mak
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index a72ffc3..c633fb9 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -1349,7 +1349,9 @@
     if (s->proto_version == V9FS_PROTO_2000L) {
         err = pdu_unmarshal(pdu, offset, "dd", &fid, &mode);
     } else {
-        err = pdu_unmarshal(pdu, offset, "db", &fid, &mode);
+        uint8_t modebyte;
+        err = pdu_unmarshal(pdu, offset, "db", &fid, &modebyte);
+        mode = modebyte;
     }
     if (err < 0) {
         goto out_nofid;
@@ -3260,9 +3262,9 @@
 
         ptr = pdu->elem.out_sg[0].iov_base;
 
-        memcpy(&pdu->size, ptr, 4);
+        pdu->size = le32_to_cpu(*(uint32_t *)ptr);
         pdu->id = ptr[4];
-        memcpy(&pdu->tag, ptr + 5, 2);
+        pdu->tag = le16_to_cpu(*(uint16_t *)(ptr + 5));
         qemu_co_queue_init(&pdu->complete);
         submit_pdu(s, pdu);
     }