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

["Chun Yan Liu" <cyliu@xxxxxxxx>]

Is there any progress on this work? I didn't see new version after this.
Anyone knows the status?

Thanks,
Chunyan

>>> On 8/11/2014 at 04:23 AM, in message
<1407702234-22309-1-git-send-email-caobosimon@xxxxxxxxx>, Bo Cao
<caobosimon@xxxxxxxxx> wrote: 
> Finally I have a workable version xl/libxl support for PVUSB. Most of 
> its commands work property now, but there are still some probelm to be
> solved. 
> Please take a loot and give me some advices.
>  
> == What have been implemented ? == 
> I have implemented libxl functions for PVUSB in libxl_usb.c. It mainly  
> consists of two part: 
> usbctrl_add/remove/list and usb_add/remove/list in which usbctrl denote usb  
> controller in which 
> usd device can be plugged in. I don't use "ao_dev" in  
> libxl_deivce_usbctrl_add since we don't need to 
> execute hotplug script for usbctrl and without "ao_dev", adding default  
> usbctrl for usb device 
> would be easier. 
>  
> For the cammands to manipulate usb device such as "xl usb-attach" and "xl  
> usb-detach", this patch now only 
> support to specify usb devices by their interface in sysfs. Using this  
> interface, we can read usb device 
> information through sysfs and bind/unbind usb device. (The support for  
> mapping the "lsusb" bus:addr to the 
> sysfs usb interface will come later). 
>  
> == What needs to do next ? == 
> There are two main problems to be solved. 
>  
> 1.  PVUSB Options in VM Guest's Configuration File 
>     The interface in VM Guest's configuration file to add usb device is:  
> "usb=[interface="1-1"]". 
> But the problem is now is that after the default usbctrl is added, the state  
> of usbctrl is "2", e,g, "XenbusStateInitWait", 
> waiting for xen-usbfront to connect. The xen-usbfront in VM Guest isn't  
> loaded. Therefore, "sysfs_intf_write" 
> will report error. Does anyone have any clue how to solve this? 
>  
> 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? 
>  
> ======== 
> There maybe some errors or bugs in the codes. Feel free to tell me. 
>  
> Cheers, 
>  
> - Simon 
>  
> --- 
> CC: George Dunlap <george.dunlap@xxxxxxxxxxxxx> 
> CC: Ian Jackson <ian.jackson@xxxxxxxxxx> 
> CC: Ian Campbell <ian.campbell@xxxxxxxxxx> 
> CC: Pasi KÃrkkÃinen <pasik@xxxxxx> 
> CC: Lars Kurth <lars.kurth@xxxxxxxxxx> 
>  
>  
>  
> _______________________________________________ 
> Xen-devel mailing list 
> Xen-devel@xxxxxxxxxxxxx 
> http://lists.xen.org/xen-devel 
>  


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