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

[Juergen Gross <jgross@suse.com>]

On 11/10/2014 04:01 PM, Konrad Rzeszutek Wilk wrote:
> 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?

I'm working on the kernel pvusb drivers.

Juergen

>
> CC-ing them.
>>
>> Thanks,
>> Chunyan
>>
>>>>> On 8/11/2014 at 04:23 AM, in message
>> <1407702234-22309-1-git-send-email-caobosimon@gmail.com>, Bo Cao
>> <caobosimon@gmail.com> 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@eu.citrix.com>
>>> CC: Ian Jackson <ian.jackson@citrix.com>
>>> CC: Ian Campbell <ian.campbell@citrix.com>
>>> CC: Pasi Kärkkäinen <pasik@iki.fi>
>>> CC: Lars Kurth <lars.kurth@citrix.com>
>>>
>>>
>>>
>>> _______________________________________________
>>> Xen-devel mailing list
>>> Xen-devel@lists.xen.org
>>> http://lists.xen.org/xen-devel
>>>
>>
>>
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