qemu-run-trick: 9p file-system has to be used in 9p2000.u version to work with recent...

QEMU trick tested to work with 4.4.5 kernel with AUFS support.

Test with overlay leads to kernel panic:

BUG: unable to handle kernel paging request at 000000040020006c
IP: [<ffffffffc00433e8>] v9fs_fid_find+0x58/0x90 [9p]

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>

diff --git a/qemu-run-trick/qemu-setup-and-run b/qemu-run-trick/qemu-setup-and-run
index 1dbca92ed15a2f4ed00f29e3d17aecb56ce31e18..15f5958c8aadbd2950384c56187ebcc3d667637c 100755 (executable)
--- a/qemu-run-trick/qemu-setup-and-run
+++ b/qemu-run-trick/qemu-setup-and-run
@@ -127,13 +127,17 @@ if [ -e /bin/resize ] ; then
   rm -f /dev/tty
   mv /dev/tty-backup /dev/tty
 fi
-mount -t 9p -o ro,trans=virtio root /mnt/rootbase
+mount -t 9p -o ro,trans=virtio,version=9p2000.u root /mnt/rootbase
 mount -t tmpfs overlay /mnt/overlay
 mkdir -p /mnt/overlay/data
 
+echo "Ready to setup overlay"
+#sleep 5
+#/bin/sh
+
 if grep -q aufs /proc/filesystems ; then
   echo "Using aufs to remap root"
-  mount -n -t aufs -o dirs=/mnt/overlay/data=rw:/mnt/rootbase=ro aufs-root ${rootmnt}
+  mount -n -t aufs -o noxino,noatime,dirs=/mnt/overlay/data=rw:/mnt/rootbase=ro aufs-root ${rootmnt}
 else
   echo "Using overlay to remap root"
   mkdir -p /mnt/overlay/work
@@ -143,7 +147,7 @@ fi
 mount -n -o move /dev ${rootmnt}/dev
 mount -n -o move /sys ${rootmnt}/sys
 mount -n -o move /proc ${rootmnt}/proc
-mount -t 9p -o trans=virtio home ${rootmnt}/home
+mount -t 9p -o trans=virtio,version=9p2000.u home ${rootmnt}/home
 mount -t tmpfs none ${rootmnt}/root
 mount -t tmpfs none ${rootmnt}/tmp
 mount -t tmpfs none ${rootmnt}/run
@@ -185,6 +189,11 @@ echo "1:2345:respawn:/sbin/agetty -n -l \${shell} -o '-l' tty1 38400 linux" >>${
 echo "2:23:respawn:/sbin/agetty -n -l \${shell} -o '-l' tty2 38400 linux" >>${rootmnt}/etc/inittab
 echo "T0:23:respawn:/sbin/agetty -n -l \${shell} -o '-l' -L ttyS0 9600 xterm" >>${rootmnt}/etc/inittab
 
+cd ${rootmnt}
+echo "Ready to proceed by pivot_root"
+#sleep 5
+#/bin/sh
+
 exec switch_root ${rootmnt} /sbin/init
 EOF