Re: [Xen-users] pv-usb support in Xen 4.7

[Juergen Gross <jgross@xxxxxxxx>]

On 01/08/16 15:06, Nathan Brooks wrote:
> Hello,
> 
> I used [4.6 vanilla kernel for dom0] and [4.6 kernel + patches described
> above https://lkml.org/lkml/2015/6/23/33  for domu].
> <https://lkml.org/lkml/2015/6/23/33>
> I also downloaded and built Xen (tag RELEASE-4.7.0 with the most fresh
> qemu-xen-dir-remote -> branch upstream-tested with hash
> e66b05e9...60ed7a4d).
> When running domu, USB controller successfully created. But when
> attaching USB mass storage device via:
> xl usbdev-attach u hostbus=1 hostaddr=1 controller=0 port=1
> command succeeded and
> xl usb-list u
> shows attached USB device, but this device not added in domu: "lsusb -v"
> shows that no any USB device connected to root hub.
> Also dmesg in domu contains suspected lines:
> ...
> xenbus_probe_frontend: Waiting for device to initialise: 25s, ...5s...
> ...
> xenbus_probe_frontend: Timeout connecting to device: device/vusb/0
> (local state 1, remote state 1)

Hmm, is the frontend module (xenhcd) enabled in Kconfig of the domU?
Is it loaded?


Juergen

> ...
> Looks like backend and frontend not connected? The question is how to
> make them work? Or may be I need to use other sources of Xen/kernel
> frontend patches?
> <https://lkml.org/lkml/2015/6/23/33>
> 
> P. S. domu config file:
> builder = "hvm"
> name = "u"
> memory = 2048
> maxmem = 2048
> vcpus = 2
> serial = 'pty'
> disk =
> ['phy:/home/xuser/xen/images/ubuntu_14.04_domu.img,sda,w','phy:/home/xuser/xen/images/u_kernel.img,sdb1,w']
> sdl = 1
> boot = "c"
> usb = 0
> usbctrl = [ "type=qusb" ]
> 
> Thanks in advance,
> Nathan
> 
> On Wed, Jul 20, 2016 at 11:55 AM, Juergen Gross <jgross@xxxxxxxx
> <mailto:jgross@xxxxxxxx>> wrote:
> 
>     On 20/07/16 10:23, George Dunlap wrote:
>     > On Tue, Jul 19, 2016 at 12:38 PM, Nathan Brooks
>     > <nathan.h.brooks@xxxxxxxxx <mailto:nathan.h.brooks@xxxxxxxxx>> wrote:
>     >> Hello all,
>     >>
>     >> I read, that new Xen 4.7 release has pv-usb support. As I understand,
>     >> there're 2 backends available (pv and qusb). But I didn't success with 
> any
>     >> of both. So, where can I get actual kernel backend/frontend module 
> sources?
>     >
>     > Juergen, is there any documentation for how to get a functioning PVUSB
>     > backend up and running?
> 
>     I'm not aware of any.
> 
>     OTOH it's just about using a qemu version with the backend included.
>     qusb support was added to qemu upstream on June 13th 2016.
> 
> 
>     Juergen
> 
> 


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