Date: Wednesday, June 15, 2016 19:59:09 -0700 From: John R Pierce pierce@hogranch.com
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
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?
Have you tried a "virsh detach-device ..." and then the corresponding [re-]attach (or maybe even just a new "attach" first)?
When my guest complains about the USB not being there I can generally make things work with:
virsh attach-device <guest> --file usb_device.xml --current
where the "usb_device.xml" file has the six lines you included above from your "virsh edit". Since your guest isn't running I think you'd have to use "--config", rather than "--current" on that line.
It's not obvious that that will clear up your assignment problem, but it might be worth a shot.