Liu,
      I will check the kernel config and get back. I tried adding --rtvm to the script then the os boots up. But if I add --lapic_pt to the script I see the vm exit handler failed message 3 to 4 times and then no response is there. I couldn't stop with acrnctl. I have to perform reboot.

So, do you mean that a separate harddisk is needed rather than virtio blk. I am using img file of 60 GB size.