[CentOS] KVM issue

running centos 6...  have had a KVM linux vm (also C6) going for quite 
awhile that depends on a USB device mapping (a external audio DAC module).

I updated the host today (yum update), it had been awhile (was like 6.5 
before, now its 6.8+), and rebooted.  the VM won't restart.

when I try and restart it, I get this

Error restoring domain: internal error Did not find USB device 8bb:2704 
bus:5 device:4

Traceback (most recent call last):
   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 44, in 
cb_wrapper
     callback(asyncjob, *args, **kwargs)
   File "/usr/share/virt-manager/virtManager/asyncjob.py", line 65, in tmpcb
     callback(*args, **kwargs)
   File "/usr/share/virt-manager/virtManager/domain.py", line 1125, in 
startup
     self._backend.create()
   File "/usr/lib64/python2.6/site-packages/libvirt.py", line 686, in create
     if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: internal error Did not find USB device 8bb:2704 bus:5 device:4


using virsh edit mydomain, I see...

     <hostdev mode='subsystem' type='usb' managed='yes'>
       <source>
         <vendor id='0x08bb'/>
         <product id='0x2704'/>
       </source>
     </hostdev>

and on the host, lsusb shows...

# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 002: ID 08bb:2704 Texas Instruments Audio Codec


note the TI Audio device is bus 5, dev 2.     Why is KVM insisting its 
bus 5 dev 4?   I've deleted the device from the VM and tried to start 
it, same error.   i've looked in every kvm/qemu related conf file I can 
find, no sign of bus 5 dev 4.

# virsh start mydomain
error: Failed to start domain mydomain
error: internal error Did not find USB device 8bb:2704 bus:5 device:4


how can I fix this?



-- 
john r pierce, recycling bits in santa cruz