bash-4.1$ sudo virt-resize --expand /dev/vda2 --LV-expand /dev/vg_main/lv_root centos6.4-x86_64-gold-master.img centos6.4-x86_64-gold-master-5G.img
Examining centos6.4-x86_64-gold-master.img ...
libguestfs: trace: set_verbose true
libguestfs: trace: set_verbose = 0
libguestfs: create: flags = 0, handle = 0x13d5bb0
libguestfs: trace: add_drive "centos6.4-x86_64-gold-master.img" "readonly:true"
libguestfs: trace: add_drive = 0
libguestfs: trace: add_drive "centos6.4-x86_64-gold-master-5G.img" "readonly:false"
libguestfs: trace: add_drive = 0
libguestfs: trace: launch
libguestfs: trace: get_tmpdir
libguestfs: trace: get_tmpdir = "/tmp"
libguestfs: launch: attach-method=appliance
libguestfs: launch: tmpdir=/tmp/libguestfscOUkVu
libguestfs: launch: umask=0022
libguestfs: launch: euid=0
libguestfs: command: run: febootstrap-supermin-helper
libguestfs: command: run: \ --verbose
libguestfs: command: run: \ -f checksum
libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
libguestfs: command: run: \ x86_64
supermin helper [00000ms] whitelist = (not specified), host_cpu = x86_64, kernel = (null), initrd = (null), appliance = (null)
supermin helper [00000ms] inputs[0] = /usr/lib64/guestfs/supermin.d
checking modpath /lib/modules/2.6.32-358.0.1.el6.x86_64 is a directory
picked vmlinuz-2.6.32-358.0.1.el6.x86_64 because modpath /lib/modules/2.6.32-358.0.1.el6.x86_64 exists
checking modpath /lib/modules/2.6.32-279.el6.x86_64 is a directory
picked vmlinuz-2.6.32-279.el6.x86_64 because modpath /lib/modules/2.6.32-279.el6.x86_64 exists
checking modpath /lib/modules/2.6.32-431.5.1.el6.x86_64 is a directory
picked vmlinuz-2.6.32-431.5.1.el6.x86_64 because modpath /lib/modules/2.6.32-431.5.1.el6.x86_64 exists
supermin helper [00000ms] finished creating kernel
supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d
supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d/base.img
supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d/daemon.img
supermin helper [00000ms] visiting /usr/lib64/guestfs/supermin.d/hostfiles
supermin helper [00023ms] visiting /usr/lib64/guestfs/supermin.d/init.img
supermin helper [00023ms] visiting /usr/lib64/guestfs/supermin.d/udev-rules.img
supermin helper [00023ms] adding kernel modules
supermin helper [00051ms] finished creating appliance
libguestfs: checksum of existing appliance: 8b1730261ac5707e649da0575701be9d6d733d196bfc13425803d30575c8ae4f
libguestfs: trace: get_cachedir
libguestfs: trace: get_cachedir = "/var/tmp"
libguestfs: [00054ms] begin testing qemu features
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -nographic
libguestfs: command: run: \ -help
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -nographic
libguestfs: command: run: \ -version
libguestfs: qemu version 0.12
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -nographic
libguestfs: command: run: \ -machine accel=kvm:tcg
libguestfs: command: run: \ -device ?
libguestfs: [00083ms] finished testing qemu features
libguestfs: accept_from_daemon: 0x13d5bb0 g->state = 1
[00083ms] /usr/libexec/qemu-kvm \
    -global virtio-blk-pci.scsi=off \
    -nodefconfig \
    -nodefaults \
    -nographic \
    -machine accel=kvm:tcg \
    -cpu host,+kvmclock \
    -m 500 \
    -no-reboot \
    -kernel /var/tmp/.guestfs-0/kernel.27666 \
    -initrd /var/tmp/.guestfs-0/initrd.27666 \
    -device virtio-scsi-pci,id=scsi \
    -drive file=centos6.4-x86_64-gold-master.img,snapshot=on,id=hd0,if=none \
    -device scsi-hd,drive=hd0 \
    -drive file=centos6.4-x86_64-gold-master-5G.img,cache=none,id=hd1,if=none \
    -device scsi-hd,drive=hd1 \
    -drive file=/var/tmp/.guestfs-0/root.27666,snapshot=on,id=appliance,if=none,cache=unsafe \
    -device scsi-hd,drive=appliance \
    -device virtio-serial \
    -serial stdio \
    -device sga \
    -chardev socket,path=/tmp/libguestfscOUkVu/guestfsd.sock,id=channel0 \
    -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \
    -append 'panic=1 console=ttyS0 udevtimeout=600 no_timer_check acpi=off printk.time=1 cgroup_disable=memory root=/dev/sdc selinux=0 guestfs_verbose=1 TERM=xterm'
kvm_create_vm: Device or resource busy
failed to initialize KVM: Operation not permitted
Back to tcg accelerator.
qemu-kvm: -drive file=centos6.4-x86_64-gold-master-5G.img,cache=none,id=hd1,if=none: 'hd1' uses a qcow2 feature which is not supported by this qemu version: QCOW version 3
qemu-kvm: -drive file=centos6.4-x86_64-gold-master-5G.img,cache=none,id=hd1,if=none: could not open disk image centos6.4-x86_64-gold-master-5G.img: Operation not supported
libguestfs: child_cleanup: 0x13d5bb0: child process died
libguestfs: sending SIGTERM to process 27675
libguestfs: trace: launch = -1 (error)
Fatal error: exception Guestfs.Error("guestfs_launch failed, see earlier error messages")
libguestfs: trace: close
libguestfs: closing guestfs handle 0x13d5bb0 (state 0)
libguestfs: command: run: rm
libguestfs: command: run: \ -rf /tmp/libguestfscOUkVu
bash-4.1$ ^C
bash-4.1$