Re: [PATCH v2 0/3] Add support for NetBSD gntdev

[Manuel Bouyer <bouyer@antioche.eu.org>]

On Fri, Nov 30, 2012 at 10:57:57AM +0100, Roger Pau Monné wrote:
> There are also other tools that build on top of libxl, like libvirt, are
> we going to modify those high level tools to add a new option to the
> config file if the disk of a DomU is in NFS and the Dom0 is NetBSD? I

No if. the admin should be able to choose what backend to use, regardless
of the storage used, and probably of the dom0 OS (you have several backend
available in linux as well, isn't it) ?

> don't think we should take that road, I think libxl should take care of
> all those quicks, and provide an uniform layer that can be trusted
> independently of the environment, so the same configuration file can be
> used in all supported Dom0 OSes.

Ho, that won't work anyway. The options to setup the network are different,
for example.

> 
> Not fixing this in libxl just moves the problem a layer upper, where
> there's a lot more of options, and of course a lot more of work to track
> and fix them all.

Then, as a compromise, could the default be specified in xend-config.sxp
and be overridable in the domU's config file ?
this way, the admin can set a sane defaut for his setup, and eventually
decide what to use on a per-domU basis.

-- 
Manuel Bouyer <bouyer@antioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la difference
--