Re: [Xen-devel] [PATCH V3 4/6] xl: add pvusb commands

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Mon, Apr 20, 2015 at 9:12 AM, Juergen Gross <jgross@xxxxxxxx> wrote:
> On 04/19/2015 05:50 AM, Chunyan Liu wrote:
>>
>> Add pvusb commands: usb-ctrl-attach, usb-ctrl-detach, usb-list,
>> usb-attach and usb-detach.
>>
>> To attach a usb device to guest through pvusb, one could follow
>> following example:
>>
>>   #xl usb-ctrl-attach test_vm version=1 num_ports=8
>>
>>   #xl usb-list test_vm
>>   will show the usb controllers and port usage under the domain.
>>
>>   #xl usb-attach test_vm 1.6
>>   will find the first usable controller:port, and attach usb
>>   device whose bus address is 1.6 (busnum is 1, devnum is 6)
>>   to it. One could also specify which <controller> and which <port>.
>>
>>   #xl usb-detach test_vm 1.6
>>
>>   #xl usb-ctrl-detach test_vm dev_id
>>   will destroy the controller with specified dev_id. Dev_id
>>   can be traced in usb-list info.
>>
>> Signed-off-by: Chunyan Liu <cyliu@xxxxxxxx>
>> Signed-off-by: Simon Cao <caobosimon@xxxxxxxxx>
>> ---
>> Changes to v2:
>>    * use bus.addr as user interface instead of busid in usb-attach|detach
>>    * remove usb-assignable-list interface
>
>
> Why? While lsusb in combination with xl usb-list for each domain will
> give the same information, having to iterate through all domains can be
> quite annoying.
>
> An alternative would be to accept omitting the domain for xl usb-list
> and list all domains with assigned usb devices in this case.

I don't understand what information it is that you want.  Do you want
a list of devices *not already assigned* to domains?

 -George

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