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

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Mon, Nov 10, 2014 at 01:37:44AM -0700, Chun Yan Liu wrote:
> Is there any progress on this work? I didn't see new version after this.
> Anyone knows the status?

I believe Olaf and Juergen were looking at this for Xen 4.6?

CC-ing them.
> 
> 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 Kärkkäinen <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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