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Some files under /sys/bus/usb/devices/ have the format 'usbX', where
X is the USB bus number. Libvirt doesn't properly parse these files when trying to resolve produce/vendor to bus/device info. When it can't parse, the guest won't start. See also Fedora bug https://bugzilla.redhat.com/show_bug.cgi?id=598272

Fixed upstream here, should be a simple backport:

http://libvirt.org/git/?p=libvirt.git;a=commit;h=fa6da6608abb262cbbe3d200bd989c17c6409090

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

Created attachment 426927 [details]
Backport of upstream fix

Internal posting:

http://post-office.corp.redhat.com/archives/rhvirt-patches/2010-June/msg00984.html

libvirt-0_8_1-11_el6 has been built in RHEL-6-candidate with the fix.

Dave

Verified PASSED with libvirt-0.8.1-13.el6.

VM start successfully with the following line in xml.
# virsh dumpxml demo
[...]
<hostdev mode='subsystem' type='usb' managed='yes'>
      <source>
        <vendor id='0x1d6b'/>
        <product id='0x0002'/>
        <address bus='1' device='1'/>
      </source>
      <alias name='hostdev0'/>
    </hostdev>

[...]

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.