Re: [Xen-users] [Xen-Users] [ARM]USB passthrough and WiFi access

[Vikram K <vikram.k@xxxxxxxxxxxxxxxxxxx>]

Hi Juergen,

Thanks for the patch.

1. Currently in Linux kernel 4.14 there is no back-end driver available? Is there any patch available ?

Applied the provided patch on DomU Linux kernel .

Config file has below lines

usbctrl=['type=auto,version=2,ports=2']
usbdev=['hostbus=1, hostaddr=1, controller=0,port=1']

Got below error when tried to run xl command

#xl create -c /etc/xen/linux4.9guest.cfg

Parsing config from /etc/xen/linux4.9guest.cfg
libxl: error: libxl_usb.c:1698:libxl__device_usbdev_add: USB device is not assignable.
libxl: error: libxl_create.c:1461:domcreate_attach_devices: unable to add usbdev devices
[ 3984.764382] xl[3770]: unhandled level 2 translation fault (11) at 0x00000000, esr 0x92000006, in libc-2.24.so[7f8f5ab000+130000]
[ 3984.775891] CPU: 7 PID: 3770 Comm: xl Tainted: G S              4.14.0-rc7 #1
[ 3984.783098] Hardware name: HiKey960 (DT)
[ 3984.787073] task: ffffffc0cd9b7080 task.stack: ffffff800fb08000
[ 3984.793065] PC is at 0x7f8f624a20
[ 3984.796411] LR is at 0x7f8f78c7b0
[ 3984.799819] pc : [<0000007f8f624a20>] lr : [<0000007f8f78c7b0>] pstate: 20000000
[ 3984.807286] sp : 0000007ff8b70d70
[ 3984.810660] x29: 0000007ff8b71c40 x28: 0000007ff8b71318
[ 3984.816041] x27: 0000000000000000 x26: 0000000000000000
[ 3984.821411] x25: 00000000341538f0 x24: 0000007ff8b70de0
[ 3984.826796] x23: 0000007ff8b70ea0 x22: 0000007ff8b70e80
[ 3984.832165] x21: 0000007ff8b70ea0 x20: 0000000000000000
[ 3984.837571] x19: 0000007f8f7e3b48 x18: 0000000000000000
[ 3984.842919] x17: 0000007f8f6249f0 x16: 0000007f8f7e1a18
[ 3984.848301] x15: 0000000000000000 x14: 0000000000000008
[ 3984.853669] x13: 0000007ffbad8001 x12: ffffff80ffffffd0
[ 3984.859056] x11: 0000000000000030 x10: 0101010101010101
[ 3984.864425] x9 : 0000007f88000f00 x8 : 0000000000000000
[ 3984.869809] x7 : 0000000000000000 x6 : 0000007f8f6aff00
[ 3984.875178] x5 : 0000007f88000028 x4 : 00000000ffffffff
[ 3984.880560] x3 : 0000000000000000 x2 : 0000000000000061
[ 3984.885933] x1 : 0000000000000000 x0 : 0000007f8f7cfc88
./lg: line 3:  3770 Segmentation fault  

On Fri, Sep 7, 2018 at 2:22 PM, Juergen Gross <jgross@xxxxxxxx> wrote:

On 07/09/18 08:11, Vikram K wrote:
> Hi,
>
> 1. We are using Hikey960 board.
> 2. Xen version is 4.8
> 3. Linux kernel version is 4.14
>
> We want to add/pass-through USB devices to DomU. From the below link I
> understood that there is no USB back and front driver support in latest
> kernel. But PVUSB support is added to *xl* tools since Xen 4.7. Please
> provide pointers on to achieve USB pass-through and hotplug.
> https://wiki.xenproject.org/wiki/Xen_USB_Passthrough
> <https://wiki.xenproject.org/wiki/Xen_USB_Passthrough>

You will need the Linux PVUSB frontend module, which I haven't had
time to upstream yet. Major blocking point was a lack of documentation
of the Xen pv ring protocol the usb maintainer wanted to see first.

I've attached a fairly recent version of the patches in case you want
to build your own kernel with the driver added.


Juergen

--

Thanks & Regards
Vikram KS

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