Re: [Xen-devel] Xen PV: Sample new PV driver for buffer sharing between domains

[Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>]

On 09/27/2018 01:16 PM, Juergen Gross wrote:
> On 27/09/2018 12:07, Oleksandr Andrushchenko wrote:
> > Hi,
> > On 09/27/2018 12:39 PM, Lars Kurth wrote:
> > > Adding a few people who have recently been working on PV drivers, as
> > > well as Julien
> > > Lars
> > >
> > > > On 27 Sep 2018, at 06:44, Omkar Bolla
> > > > <omkar.bolla@xxxxxxxxxxxxxxxxxxx
> > > > <mailto:omkar.bolla@xxxxxxxxxxxxxxxxxxx>> wrote:
> > > >
> > > > Hi,
> > > >
> > > > I am using Debian as Domain-0 and Debian as Domain-U on Hikey960
> > > > platform(ARMv8) and using Xen-4.8 stable release. Here I want to
> > > > create a PV frontend and backend to share memory between Domain-0 and
> > > > Domain-U.
> > > >
> > > >
> > > >
> > > > I used below link to create frontend and backend,
> > > > https://fnordig.de/2016/12/02/xen-a-backend-frontend-driver-example/
> > The link above has another link to github [1] with 2 chapters. And it
> > looks like you have
> > already modified the sources ("mydevice" -> "vdevb" at least).
> > So, what are the sources you are using?
> >
> > You could probably take a look at the relatively small vkbd frontend
> > driver [2]
> > to get some hints.
> > > > But I am facing below errors while adding device vdevb to xenstore.
> > > > Below errors I am getting from xenbus_switch_state().
> > > > vdevb vdevb-0: failed to write error node for device/vdevb/0 (13
> > > > writing new state)
> Error 13 is EACCESS. I guess the access rights of the Xenstore nodes
> are not sufficient to write the needed entries.
>
> Did you modify Xen tools (xl/libxl) for adding the new device type?
> If not you need to setup the Xenstore nodes manually.
There is a script [1] which comes with the example implementation,
so I believe Omkar uses it with "mydevice" -> "vdevb" change
> Juergen
[1] 
https://github.com/badboy/xen-split-driver-example/blob/master/chapter02/activate.sh
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