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Re: [Xen-devel] Xen PV: Sample new PV driver for buffer sharing between domains
- To: Oleksandr Andrushchenko <andr2000@xxxxxxxxx>, Lars Kurth <lars.kurth.xen@xxxxxxxxx>, Omkar Bolla <omkar.bolla@xxxxxxxxxxxxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 27 Sep 2018 12:16:29 +0200
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- Cc: Julien Grall <julien.grall@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
- Delivery-date: Thu, 27 Sep 2018 10:16:34 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
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.
Juergen
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