Re: [Xen-devel] [PVUSB] usbbusname is changing after rebooting

[Neobiker <neo-ml-efw-1106@xxxxxxxxxxx>]

Hi Sergey,

i thought i had trouble with that too, until i figured out that the USB-Bus
only seemed to have changed, when i changed the connected Device e.g. from
USB-Printer to USB-Stick. The Printer uses the UHCI Controller (3-1), versus
the USB-Stick connected to the EHCI Controller (5-1). Besides this the USB
ports are stable on my Debian Lenny System. 

So in my summary, the USB-Bus don't changes if you don't switch from UHCI to
EHCI according to the connected device.

regards 
Neobiker 


Sergey-53 wrote:
> 
> Hello, all!
> Hello, Noboru!
> 
> Hotplug rule for PVUSB consists of
> <usbbusname>:<domid>:<vusb number>:<port number>
> 
> I noticed that usbbusname sometimes changes from time to time after host 
> rebooting.
> For example, yesterday i had it as "6-1", today it is "2-1".
> 
> I saw the topic about usbbusname on replugging.
> http://lists.xensource.com/archives/html/xen-devel/2009-04/msg00400.html
> Replugging doesn't change the usbbusname, but what about host rebooting?
> 
>  I suppose, usb bus number is assigned during booting and may vary each 
> time.
> To identify usb device correctly i have to see dmesg after rebooting. 
> It's quite inconvinient, imho.
> 
> What do you think about another method of USB naming like 
> VendorId:ProductId of usb devices to be grabbed by domU?
> It seems that HVM guests use this method by means of the parameter 
> 'usbdevice'.
> 
> Thank you.
> 
> Sergey.
> 
> 
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