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