Can't install qxl driver for display device in windows guest after converting to glance by virt-v2v

Issue

• Convert a windows guest from kvm to openstack by virt-v2v

  # virt-v2v kvm-win7-x86_64 -o glance
  [   0.0] Opening the source -i libvirt kvm-win7-x86_64
  [   0.0] Creating an overlay to protect the source from being modified
  [   0.2] Initializing the target -o glance
  [   1.3] Opening the overlay
  [   3.4] Inspecting the overlay
  [   6.7] Checking for sufficient free disk space in the guest
  [   6.7] Estimating space required on target for each disk
  [   6.7] Converting Windows 7 Ultimate to run on KVM
  virt-v2v: warning: /usr/share/virt-tools/pnp_wait.exe is missing.  
  Firstboot scripts may conflict with PnP.
  virt-v2v: This guest has virtio drivers installed.