qemu+kvm create VM

qemu-img create -f qcow2 image0 20G

qemu-system-x86_64 --enable-kvm image0 -m 2048 -smp 2 -netdev tap,id=mynet0 -device virtio-net-pci,netdev=mynet0 -cdrom /home/qemutest/CentOS-6.4-x86_64-minimal.iso -boot d

vncviewer :5900

qemu-system-x86_64 --enable-kvm image0 -m 2048 -smp 2 -netdev tap,id=mynet0 -device virtio-net-pci,netdev=mynet0