Re: [Xen-devel] [PATCH v0 RFC 0/2] xl/libxl support for PVUSB

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Sun, Aug 10, 2014 at 4:23 PM, Bo Cao <caobosimon@xxxxxxxxx> wrote:
> 2. sysfs_intf_write
>     In the process of "xl usb-attach domid intf=1-1", after writing "1-1" to 
> Xenstore entry, we need to
> bind the controller of this usb device to usbback driver so that it can be 
> used by VM Guest. For exampele,
> for usb device "1-1", it's controller interface maybe "1-1:1.0", and we write 
> this value to "/sys/bus/usb/driver/usbback/bind".
> But for some devices, they have two controllers, for example "1-1:1.0" and 
> "1-1:1.1". I think this means it has two functions,
> such as usbhid and usb-storage. So in this case, we bind the two controller 
> to usbback?

So looking at tools/python/xen/util/vusb_util.c:bind_usb_device(), it
looks like what xend did was take the "device" (which would be "1-1"),
and search the sysfs usb node for all "interfaces" (which would be
"1-1:.*"), and then unbind each of them and bind them to usbback.

(Obviously I needed to check out a 4.4 branch to look at the xend
code, since it's been deleted in the development branch.)

 -George

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