Re: Bug in usbdevices option handling when BusID=8

[Gordan Bobic <gordan@bobich.net>]

On 08/05/2013 02:22 PM, George Dunlap wrote:
> On Mon, Aug 5, 2013 at 8:29 AM, Ian Campbell <Ian.Campbell@citrix.com> wrote:
>> On Sun, 2013-08-04 at 12:08 +0100, Gordan Bobic wrote:
>>> At a glance, this looks like something buggy happens when BusID=8. It
>>> sees that the device is host:008.002, but then goes and tries to open
>>> /dev/bus/usb/000/002 instead of /dev/bus/usb/008/002.
>>
>> Smells like a bitmask gone wrong somewhere, or something like that.
>>
>> xl/libxl doesn't really do much with the string which you passed in so
>> it should be going straight to qemu unmodified. You ought to be able to
>> see this in the logs I think.
>
> Or using ps -ax -- what does that show the command-line to be?

It looks like a qemu-traditional (qemu-dm) issue:

# grep usb /var/log/xen/qemu-dm-edi.log
husb: open device 0.2
/dev/bus/usb/000/002: No such file or directory

# ps auxw | grep qemu
root      8364  4.4  0.0 239132  8880 ?        SLsl 20:16   0:07 
/usr/lib/xen/bin/qemu-dm -d 1 -domain-name edi -vnc 127.0.0.1:0 
-vncunused -k en-gb -serial pty -videoram 8 -std-vga -boot c -usb 
-usbdevice host:008.002 -acpi -vcpus 8 -vcpu_avail 0xff -net 
nic,vlan=0,macaddr=00:16:3e:4e:c5:0c,model=e1000 -net 
tap,vlan=0,ifname=vif1.0-emu,bridge=br0,script=no,downscript=no -M xenfv

Gordan