[Fedora-xen] VMX guest machine issue

[sxu1902]

Hi,
 
I am testing Xen3 on FC5. My FC5 is x86_64. My box is using Pentium D 920 on Asus P5LD2-VM
motherboard with 2G RAM.
 
After installation, "xm list" shows domain0 running ok.
 
I use:
dd if=/dev/zero of=/hdd_mnt/sda5/g_img/gl112/gl112.img bs=1M count=1 seek=10240 
to create iamge file.
 
And the paremeter file look like this:
 
# Automatically generated xen config file
name = "gl112"
builder = "hvm"
memory = "256"
acpi = 0
apic = 0
cdrom = '/hdd_mnt/sda5/dvd/CentOS-4.3-i386-binDVD.iso'
#cdrom = '/dev/cdrom'
boot = 'd'
disk = [ 'file:/hdd_mnt/sda5/g_img/gl112/gl112.img,ioemu:hda,w' ]
vif = [ 'type=ioemu,bridge=xenbr0,mac=00:17:3e:59:78:30' ]
on_reboot = 'restart'
on_crash = 'restart'
#on_poweroff = 'destroy'
kernel = '/usr/lib/xen/boot/hvmloader'
device_model = '/usr/lib64/xen/bin/qemu-dm'
sdl = 1  # use SDL for graphics
vnc = 0 # use VNC for graphics
vncviewer = 0 # spawn vncviewer by default
nographic = 0 # don't use graphics
serial = 'pty' # enable serial console
I tried different linux distributions as VMX guest. It appears to me the guest machine
always reboot itself when loading the linux from CD images or CDs. Sometimes it even
freezes domain0. Occasionally it boots into the installation CD (after reboot itself once)
and tells me it can't find hard drive, so it can't proceed with the
installation... 
Anybody tested VMX? Any similar problems? Any suggestions?
Sam Xu