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xen-users
RE: [Xen-users] howto build xen from source with existing config?
> -----Original Message-----
> From: Philippe Trolliet [mailto:p.trolliet@xxxxxxxxxxxxxxx]
> Sent: 25 May 2007 11:36
> To: Ian Tobin; Petersson, Mats; Xen-Users
> Subject: RE: [Xen-users] howto build xen from source with
> existing config?
>
> hi,
> i updated my FC6 and it uses the 2.6.20-xen kernel. so i want
> to use this version.
> it should be possible to use this kernel and its config in
> xen 3.1 compile process. i mean, how are the people of redhat
> doing that?
> they released a newer xen-kernel.
> i´ll just try it like the way you described but with the
> 2.6.20 config.
The people at redhat (etc) spend many manhours porting the Xen sparse-tree and
patches to match the new kernel (the sparse-tree contains complete files that
replace the existing files in the linux-2.6.X-xen tree. So for example, in the
baremetal version of Linux, there is a bar.c, and in the sparse-tree there is a
bar-xen.c, which gets copied into the linux-...-xen tree. In the build of the
linux-xen version, the last part of the build-process will pick the -xen files
instead of the non-xen version.
Since the new linux kernel is possibly quite different inside the bar.c, it
also needs the corresponding changes in the bar-xen.c. Depending on how bar.c
has changed, this may be rather trivial (add/remove a couple of simple lines,
change the type of a variable or some such), but it can also be quite
complicated because the internal workings may have changed.
It's not just a case of copying the config file, from one version to another,
it is all the changes in the sparse-tree (or in the linux-2.6.X-xen tree) that
makes it complex.
--
Mats
>
> regards
> philippe
>
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx]On Behalf Of Ian Tobin
> Sent: Freitag, 25. Mai 2007 12:08
> To: Petersson, Mats; Philippe Trolliet; Xen-Users
> Subject: RE: [Xen-users] howto build xen from source
> with existing config?
>
>
> Hey,
>
> dont know if this is any use to you but i found that
> booting in xen mode and running
>
> make oldconfig
>
> in the linux-2.6.18-xen directory
>
> seems to import the exiting XEN config into the new
> one. Just hold down enter when it prompts for different elements :)
>
> thanks
>
>
> ________________________________
>
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx on behalf
> of Petersson, Mats
> Sent: Fri 25/05/2007 11:05
> To: Philippe Trolliet; Xen-Users
> Subject: RE: [Xen-users] howto build xen from source
> with existing config?
>
>
>
>
>
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> > Philippe Trolliet
> > Sent: 25 May 2007 09:09
> > To: Xen-Users
> > Subject: [Xen-users] howto build xen from source with
> existing config?
> >
> > hi,
> > i´m using fedora core 6 and want to build xen 3.1 from source
> > for the 2.6.20
> > kernel. how can i build xen with the existing kernel-config
> > from /boot (e.g.
> > config-2.6.20-1.2948.fc6xen) and an installed kernel-devel
> > (source) package?
> > is it good to use this config or should i create a new one?
>
> You should be able to use the config for another
> kernel, as long as the config is for the same base-level
> kernel (e.g. it may not work to use a 2.6.18 config to build
> a 2.6.20 kernel, and probably even worse the other way around).
>
>
> > i searched the net and haven´t found any howto to build xen
> > from source with
> > newer kernel versions and existing config files.
>
> As stated in a post yesterday, the best way to achieve
> this is to wait for one of the distributors to do the hard
> work of figuring out how to adopt the kernel patches from Xen
> into the next version of the kernel - because that's what
> you'll have to do.
>
> However, if you want to go with the current FC6 Dom0
> kernel, and use the new 3.1 tools and Xen Hypervisor, that
> should work ok.
>
> --
> Mats
> > in the users documentation i found sth like make ARCH=xen
> > oldconfig but this
> > doesn´t work. the README couldn´t help me too.
> > please give detailed instructions.
> > thank you
> >
> > regards
> > philippe
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
> >
> >
>
>
>
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>
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