操作命令：
qemu-img create -f qcow2 /var/lib/ceph/osd/ceph-0/data/win7.img 10G
virt-install --connect qemu:///system --name=win7 --os-variant=win7 --ram=1024 --vcpus=2 --disk path=/var/lib/ceph/osd/ceph-0/data/win7.img,format=qcow2,size=10,bus=virtio --accelerate --vnc --vncport=5910 --vnclisten=0.0.0.0 --network network=default,model=virtio --noautoconsole --cdrom=/var/lib/ceph/osd/ceph-0/data/win7.iso
报错信息：
2016-09-22T08:26:56.176825Z qemu-system-x86_64: -device virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:66:e2:82,bus=pci.0,addr=0x3: pci_add_option_rom: failed to find romfile "efi-virtio.rom"
