[root@ip-10-196-47-63 ~]# time ./test.sh 
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
kvm_create_vm: Device or resource busy
Could not initialize KVM, will disable KVM support
OK

real	4m55.502s
user	4m33.564s
sys	0m12.962s
[root@ip-10-196-47-63 ~]# rpm -q libguestfs
libguestfs-1.4.3-3.fc13.x86_64