4:11 a.m.
So I have an entry for a USB device ( ID 051d:0002, UPS) I want
to use with a given vm client. In that vm client's config file I added
something like this:
<hostdev mode='subsystem' type='usb' managed='yes'>
<source>
<vendor id='0x051d'/>
<product id='0x0002'/>
</source>
</hostdev>
And that worked fine for a while. Now I moved the vm host, and then
put the cable to the UPS on an available USB port
Bus 002 Device 006: ID 051d:0002 American Power Conversion Uninterruptible Power
and tried to restart the client... and got the following message:
error: internal error Did not find USB device 51d:2 bus:2 device:3
Er, why should it care about which bus and device this is? I thought
my config would mean it would look for the device that matched the ID
in the config no matter where it was. How did it learn and memorized
what I guess is the old location?
5 a.m.
On 09/24/2014 04:11 PM, Mauricio Tavares wrote:
So I have an entry for a USB device ( ID 051d:0002, UPS) I
want
to use with a given vm client. In that vm client's config file I added
something like this:
<hostdev mode='subsystem' type='usb' managed='yes'>
<source>
<vendor id='0x051d'/>
<product id='0x0002'/>
</source>
</hostdev>
And that worked fine for a while. Now I moved the vm host, and then
put the cable to the UPS on an available USB port
Bus 002 Device 006: ID 051d:0002 American Power Conversion Uninterruptible Power
and tried to restart the client... and got the following message:
error: internal error Did not find USB device 51d:2 bus:2 device:3
Er, why should it care about which bus and device this is? I thought
my config would mean it would look for the device that matched the ID
in the config no matter where it was. How did it learn and memorized
what I guess is the old location?
It needs to lookup the bus/device at VM startup time, so it can set
permissions on the device node.
Check your VM XML (not from /etc/libvirt, but from virsh dumpxml $vmname), and
ensure that the bus/device didn't get encoded somehow.
- Cole
5:08 a.m.
On Wed, Sep 24, 2014 at 5:00 PM, Cole Robinson <crobinso(a)redhat.com> wrote:
On 09/24/2014 04:11 PM, Mauricio Tavares wrote:
> So I have an entry for a USB device ( ID 051d:0002, UPS) I want
> to use with a given vm client. In that vm client's config file I added
> something like this:
>
> <hostdev mode='subsystem' type='usb'
managed='yes'>
> <source>
> <vendor id='0x051d'/>
> <product id='0x0002'/>
> </source>
> </hostdev>
>
> And that worked fine for a while. Now I moved the vm host, and then
> put the cable to the UPS on an available USB port
>
> Bus 002 Device 006: ID 051d:0002 American Power Conversion Uninterruptible Power
>
> and tried to restart the client... and got the following message:
>
> error: internal error Did not find USB device 51d:2 bus:2 device:3
>
> Er, why should it care about which bus and device this is? I thought
> my config would mean it would look for the device that matched the ID
> in the config no matter where it was. How did it learn and memorized
> what I guess is the old location?
>
It needs to lookup the bus/device at VM startup time, so it can set
permissions on the device node.
Check your VM XML (not from /etc/libvirt, but from virsh dumpxml $vmname), and
ensure that the bus/device didn't get encoded somehow.
This is the output from virsh dumpxml vmclient, with client off
(can't start because of said error):
<domain type='kvm'>
<name>vmclient</name>
<uuid>5a4cde18-5bb7-49ab-a11a-edb305fe4a87</uuid>
<memory unit='KiB'>524288</memory>
<currentMemory unit='KiB'>524288</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='rhel6.3.0'>hvm</type>
<boot dev='hd'/>
<boot dev='cdrom'/>
<bootmenu enable='yes'/>
</os>
<features>
<acpi/>
</features>
<cpu mode='custom' match='exact'>
<model fallback='allow'>Westmere</model>
</cpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/libexec/qemu-kvm</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='raw' cache='none'
io='native'/>
<source file='/dev/vmhost_vg0/vmclient'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x04'
function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hda' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0'
target='0' unit='0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<target dev='hdb' bus='ide'/>
<readonly/>
<address type='drive' controller='0' bus='0'
target='0' unit='1'/>
</disk>
<controller type='usb' index='0'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01'
function='0x2'/>
</controller>
<controller type='ide' index='0'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01'
function='0x1'/>
</controller>
<interface type='bridge'>
<mac address='c0:ff:ee:4f:96:a9'/>
<source bridge='lanbr'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03'
function='0x0'/>
</interface>
<input type='tablet' bus='usb'/>
<input type='mouse' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes'
listen='127.0.0.1'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x02'
function='0x0'/>
</video>
<hostdev mode='subsystem' type='usb' managed='yes'>
<source>
<vendor id='0x051d'/>
<product id='0x0002'/>
</source>
</hostdev>
<memballoon model='virtio'>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x05'
function='0x0'/>
</memballoon>
</devices>
</domain>
It must be me but I have not seen anything that is trying down that
usb device to a given bus/device. I will also check the vmhost's logs
to see if there is any funny business there.
- Cole
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Cole Robinson -
Mauricio Tavares