===== 
virt-install
virt-clone
virt-image
virt-viewer
============= create virtual disk
qemu-img create hda.img -f qcow 6G
kvm -no-acpi -m 256 -cdrom winxpsp2.iso -hda hda.img -boot d
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qemu -hda /home/images/wxp.img -cdrom /home/images/wxp.iso -boot d