请教centos 7安装qemu-kvm之后，用virt-install来安装虚拟机报错?报错

请教centos 7安装qemu-kvm之后，用virt-install来安装虚拟机报错， 

virt-install --name=win7 --os-variant=win7 --ram=1024 --vcpus=2 --disk path=/d/virtual-machine/win7.img,format=qcow2,size=40,bus=virtio  --accelerate --vnc --vncport=5910 --vnclisten=0.0.0.0 --network bridge=br0,model=virtio --noautoconsole --cdrom=/dev/sr0

已经放入光盘，当前用户是root， 不管selinux是否关闭同样都会报错：

Starting install...
ERROR    internal error: early end of file from monitor: possible problem:
qemu-kvm: -drive file=/dev/sr0,if=none,id=drive-ide0-1-0,readonly=on,format=raw: could not open disk image /dev/sr0: Driver 'host_cdrom' is not whitelisted

Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect qemu:///system start win7
otherwise, please restart your installation.