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The /etc/sysconfig/modules/kvm.modules script is used at bootup to load the kvm module, however we also need to load the vhost-net module, otherwise we'll see greatly reduced network through-put.

libvirt we automagically use vhost if /dev/vhost-net exists.
We need to automate this process

selinux-policy bug open: https://bugzilla.redhat.com/show_bug.cgi?id=599146

Verified on qemu-kvm-0.12.1.2-2.77.el6. PASS

Steps:
1. reboot host
2. # lsmod | grep vhost
vhost_net              23066  0 
macvtap                 7701  1 vhost_net
tun                    16583  1 vhost_net