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Once bug 861331 is fixed it will be possible to migrate vms with usb-redir devices without using seamless migration. Currently spice-gtk gets confused about the USB state after a non-seamless (switch-host or semi-seamless) migration. It thinks a device is still redirected, un-redirecting and redirecting it again won't restore vm access to the device.

I've posted 2 patches upstream fixing this:
http://lists.freedesktop.org/archives/spice-devel/2012-September/011033.html
http://lists.freedesktop.org/archives/spice-devel/2012-September/011034.html

I believe we should fix this for 6.4 too.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0343.html