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

[Simon Cao <caobosimon@xxxxxxxxx>]

Hi,

I was working on the work. But I was busing preparing some job interviews in the last three months, sorry for this long delay. I will update my progress in a few days.

Thanks!

Bo Cao

On Mon, Nov 10, 2014 at 4:37 PM, Chun Yan Liu <cyliu@xxxxxxxx> wrote:

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
>Â Â ÂThe 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
>Â Â ÂIn 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>
>
>
>

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