[Xen-users] Problem when using raw/file in disk parameter

[Cristiano Carlos Matte <cristiano.matte@xxxxxxxxxxxx>]

Hi everyone,

I have an ARM environment with the Linux Kernel 3.19, Ubuntu 12.04 filesystem 
and Xen 4.4 for ARM.
I can successfully intantiate VMs using a loopback device as the disk, and 
'phy' as the disk driver for Xen. The following script works well:
kernel = "zImage"
memory = 512
name = "Linaro"
vcpus = 2
serial="pty"
disk = [ 'phy:/dev/loop0,xvda,w' ]
vif = ['bridge=br0']
extra = 'console=hvc0 xencons=tty root=/dev/xvda'

The problem is that I need to instantiate VMs with 'raw'/'file' drivers, like 
the script below.
kernel = "zImage"
memory = 512
name = "Linaro"
vcpus = 2
serial="pty"
disk = [ 'file:/home/admin/linaro.img,xvda,w' ]
vif = ['bridge=br0']
extra = 'console=hvc0 xencons=tty root=/dev/xvda'

But, when I try to create a VM, the following error is ocurring:

libxl: error: libxl_dm.c:1255:libxl__spawn_local_dm: device model 
/usr/lib/xen-4.4/bin/qemu-dm is not executable: No such file or directory
libxl: error: libxl_dm.c:1393:device_model_spawn_outcome: (null): spawn 
failed (rc=-3)
libxl: error: libxl_create.c:1189:domcreate_devmodel_started: device model 
did not start: -3
I've noticed that there was no qemu-dm in /usr/lib/xen-4.4/bin/. So I've 
added the following lines to the script:
device_model_version="qemu-xen"
device_model_override="/usr/bin/qemu-system-i386"

Now, Xen can find qemu-dm, but the following error is ocurring:

libxl: error: libxl_dm.c:1393:device_model_spawn_outcome: domain 16 device 
model: spawn failed (rc=-3)
libxl: error: libxl_create.c:1189:domcreate_devmodel_started: device model 
did not start: -3
libxl: error: libxl_dm.c:1497:kill_device_model: Device Model already exited

If I try to execute qemu-dm from /usr/bin/qemu-system-i386 it outputs the 
following error:
Could not initialize SDL(No available video device) - exiting

I am using a Cubietruck (http://www.cubietruck.com) that has no video device. 
I have framebuffer enabled and connect via SSH to use it. Xen should use it 
only for emulating VMs' disks.
How can I fix this problem?

Thanks!

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