From mboxrd@z Thu Jan  1 00:00:00 1970
From: Juergen Gross <jgross@suse.com>
Subject: Re: [PATCH V4 3/7] libxl: add pvusb API
Date: Tue, 16 Jun 2015 15:06:30 +0200
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To: Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, George Dunlap <George.Dunlap@eu.citrix.com>, Chunyan Liu <cyliu@suse.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>, Jim Fehlig <jfehlig@suse.com>, Simon Cao <caobosimon@gmail.com>
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On 06/16/2015 01:45 PM, Ian Jackson wrote:
> Juergen Gross writes ("Re: [Xen-devel] [PATCH V4 3/7] libxl: add pvusb API"):
>> On 06/16/2015 01:10 PM, Ian Jackson wrote:
>>> AIUI some devices have serial numbers, which means you can distinguish
>>> them ?
>>
>> Yes, they have. The question is whether those are different on multiple
>> instances? With "lsusb" I've found a device with serial number
>> 0123456789ABCD. Do you really believe I'm just lucky owning the one with
>> such a nice serial number? ;-)
>
> Heh.  I think, though, that this suggests that if the user has devices
> whose serial numbers are actually different, they should be able to
> specify a device by vid/pid/serial.

I think you are right.

The next question: should this be part of libxl or qemu? It should be
possible to extend the qemu <vendorId>:<productId> syntax to
<vendorId>:<productId>:<serial> without too much effort, as libusb
includes some support to obtain the serial number.


Juergen