libvirt users - Apr 2013 - Filesystem passthrough of a Lustre mounted directory

Hi,

I am trying to pass a Lustre directory mounted on the host to the guest. 
I can pass a local directory in just fine when starting an instance via 
virsh. I can execute the qemu command from libvirt's logs (dropping ?S 
flag) directly, and passing the Lustre mounted directory also works (but 
the network complains about different MAC address). However, when I 
start an instance using virsh, the mount inside the guest succeeds, and 
ls works sometimes, but everything else (cat, touch, actual edit) on any 
file in the mounted directory gives "Identifier removed" after some
delay.

Is libvirt doing something beyond just calling qemu that can cause this 
problem? And how do I get around it?

The host is RedHat 6.1, libvirt 1.0.3, qemu 1.4.50.

Thanks,
Tatiana

The command pulled out from the libvirt's log:

LC_ALL=C PATH=/sbin:/usr/sbin:/bin:/usr/bin QEMU_AUDIO_DRV=none \
/usr/local/bin/qemu-system-x86_64 \
-name i3e -M pc-0.14 -S \
-cpu 
SandyBridge,+pdpe1gb,+osxsave,+dca,+pcid,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pbe,+tm,+ht,+ss,+acpi,+ds,+vme
\
-enable-kvm -m 2048 -smp 1,sockets=1,cores=1,threads=1 \
-uuid ccc66436-8535-472e-8397-eee52d01cffe -no-user-config -nodefaults \
-chardev 
socket,id=charmonitor,path=/var/lib/libvirt/qemu/i3e.monitor,server,nowait \
-mon chardev=charmonitor,id=monitor,mode=control -rtc 
base=utc,driftfix=slew \
-no-kvm-pit-reinjection -no-shutdown -kernel 
/var/lib/nova/instances/instance-0000003d/kernel \
-initrd /var/lib/nova/instances/instance-0000003d/ramdisk \
-append root=/dev/vda \
-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
-drive 
file=/var/lib/nova/instances/instance-0000003d/disk,if=none,id=drive-virtio-disk0,format=qcow2,cache=none
\
-device 
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
\
-fsdev local,security_model=passthrough,id=fsdev-fs0,path=/mnt/lustre/ \
-device 
virtio-9p-pci,id=fs0,fsdev=fsdev-fs0,mount_tag=testfs,bus=pci.0,addr=0x3 \
-chardev 
file,id=charserial0,path=/var/lib/nova/instances/instance-0000003d/console.log 
\
-device isa-serial,chardev=charserial0,id=serial0 -chardev 
pty,id=charserial1 \
-device isa-serial,chardev=charserial1,id=serial1 -device 
usb-tablet,id=input0 \
-netdev tap,fd=30,id=hostnet0 -device 
rtl8139,netdev=hostnet0,id=net0,mac=fa:16:3e:39:23:6f,bus=pci.0,addr=0x4 \
-vnc 127.0.0.1:3 -k en-us -vga cirrus -device 
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6