Re: Xen PVUSB work

[George Dunlap <george.dunlap@eu.citrix.com>]

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On 16/08/13 23:34, Shakil k wrote:
>
> Hi George,
>
> Can you let me know the required work needed in the area of  libxl/xl 
> PVUSB also if you have any documents or suggestion, then please pass 
> on to me.
>

There are two things that need work, actually:

* Linux kernel side of the PVUSB.

There is a PVUSB implimentation in SuSE's "classic Xen" kernel that some 
people have been able to use, but there are reports that it can be a bit 
flaky.  There is no PVUSB kernel support in mainline Linux.  There was 
an initial port some time ago (Konrad can point you to the tree), but it 
needs to be rebased, fixed, and upstreamed.  If you have the time and 
inclination, this is probably the most critical part to getting PVUSB 
working for 4.4, as it's something the rest of us definitely don't have 
time to do.

* The toolstack side

Near the end of 4.3 we were developing a general interface for adding 
host USB devices.  The interface was designed to be able to support 
either HVM or PV guests.  It didn't make it in on time, but it's close 
to being done, and I fully expect that I can get it in for 4.4.  The 
patch series I was working on would have implemented only HVM guests, it 
should be fairly easy to extend for PV guests.

I probably won't have time to work on it for about a month or so; if the 
kernel side isn't your cup of tea, you'd be welcome to pick up that 
patch series and try to get it in shape for submission, then add the 
necessary PV bits.

Patch series here:

http://lists.xen.org/archives/html/xen-devel/2013-04/msg02012.html

Let me know if you do decide to go this route, and I can post the code 
which partially addresses those comments.

Information on steps required to initiate the PV USB connection given a 
working PVUSB front-end and back-end here:

http://www.neobiker.de/wiki/index.php?title=XEN-PVUSB

  -George


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