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Re: [Qemu-devel] [Xen-devel] [PATCH] configure: introduce --enable-xen-f

From: Juergen Gross
Subject: Re: [Qemu-devel] [Xen-devel] [PATCH] configure: introduce --enable-xen-fb-backend
Date: Fri, 14 Apr 2017 10:50:21 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0

On 14/04/17 08:06, Oleksandr Andrushchenko wrote:
> On 04/14/2017 03:12 AM, Stefano Stabellini wrote:
>> On Tue, 11 Apr 2017, Oleksandr Andrushchenko wrote:
>>> From: Oleksandr Andrushchenko <address@hidden>
>>> For some use cases when Xen framebuffer/input backend
>>> is not a part of Qemu it is required to disable it,
>>> because of conflicting access to input/display devices.
>>> Introduce additional configuration option for explicit
>>> input/display control.
>> In these cases when you don't want xenfb, why don't you just remove
>> "vfb" from the xl config file? QEMU only starts the xenfb backend when
>> requested by the toolstack.
>> Is it because you have an alternative xenfb backend? If so, is it really
>> fully xenfb compatible, or is it a different protocol? If it is a
>> different protocol, I suggest you rename your frontend/backend PV device
>> name to something different from "vfb".
> Well, offending part is vkbd actually (for multi-touch
> we run our own user-space backend which supports
> kbd/ptr/mtouch), but vfb and vkbd is the same backend
> in QEMU. So, I am ok for vfb, but just want vkbd off
> So, there are 2 options:
> 1. At compile time remove vkbd and still allow vfb
> 2. Remove xenfb completely, if acceptable (this is my case)

What about adding a Xenstore entry for backend type and let qemu test
for it being not present or containing "qemu"?


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