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Re: [Xen-users] Still un-answered: How-To build Xen (3.2) to override Xe

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Still un-answered: How-To build Xen (3.2) to override XenSource's linux-kernel (2.6.18) with a xenified kernel (your own or distribution)
From: Jithendra Bethur <bcj01@xxxxxxxxx>
Date: Tue, 8 Jul 2008 04:43:29 -0700 (PDT)
Delivery-date: Tue, 08 Jul 2008 04:44:08 -0700
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Progress/Update and a new-sub-question!


Thanks to all for your quick and accurate response.  I was able to build Xen 3.2 AND override the linux kernel-xen pointer by modifying the buildconfigs/src.hg-clone.  I will shortly post a detailed full instructions for other (Fedora core) users.


Sub-Question: As Tim Post suggested, I was able to build the linux kernel seperately and use that with Xen-kernel to successfully boot to Xen+Dom0.  But just for completion sake, I tried to bulid the linux kernel from within Xen-3.2.0 (by 'make prep-kernel' AND 'copying .config' AND make world).  It almost completed the build 99% (I think) and encountered the below error (while copying the vmlinux file to ...../arch/i386/boot/ directory).

--------- <<<< Begin: Build output (partial) with error <<<<<< ---------------------------------




WARNING: vmlinux - Section mismatch: reference to .init.text:__alloc_bootmem_low from .text between 'xen_machine_kexec_setup_resources' (at offset 0xc1151646) and 'xen_machine_kexec_load'
  OBJCOPY vmlinux-stripped
BFD: vmlinux-stripped: warning: allocated section `.notes' not in segment
  GZIP    vmlinuz
make[3]: Leaving directory `/home/dev1/xen-build/xen-3.2.0/build-linux-2.6.18-xen_x86_32'
mkdir -p /home/dev1/xen-build/xen-3.2.0/dist/install/boot
cp build-linux-2.6.18-xen_x86_32/arch/i386/boot/vmlinuz /home/dev1/xen-build/xen-3.2.0/dist/install/boot/vmlinuz-
cp: cannot stat `build-linux-2.6.18-xen_x86_32/arch/i386/boot/vmlinuz': No such file or directory
make[2]: *** [build] Error 1
make[2]: Leaving directory `/home/dev1/xen-build/xen-3.2.0'
make[1]: *** [linux-2.6-xen-install] Error 2
make[1]: Leaving directory `/home/dev1/xen-build/xen-3.2.0'
make: *** [install-kernels] Error 1

--------- <<<< End: Build output (partial) with error <<<<<< ---------------------------------


Why am I getting this:

cp: cannot stat `build-linux-2.6.18-xen_x86_32/arch/i386/boot/vmlinuz': No such file or directory

errror with cp?


I noticed that under the 'build-linux-2.6.18-xen_x86_32/arch/i386'  directory there was really no boot/ directory.  Rather there was a boot-xen/ directory (along with other directories like crypto, kernel, lib, mach-xen etc).  The destination dist/install/boot existed.


Why would the .....arch/i386/boot directory be missing.

PS: This may well be Fedora Core specific (in which case we may drop it at this if inappropriate)



Jithendra B

--- On Sun, 7/6/08, Tim Post <echo@xxxxxxxxxxxx> wrote:

From: Tim Post <echo@xxxxxxxxxxxx>
Subject: Re: [Xen-users] Still un-answered: How-To build Xen (3.2) to override XenSource's linux-kernel (2.6.18) with a xenified kernel (your own or distribution)
To: "Jithendra Bethur" <bcj01@xxxxxxxxx>
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Date: Sunday, July 6, 2008, 8:50 PM

On Sun, 2008-07-06 at 15:22 -0700, Jithendra Bethur wrote:
> Hello, 
> I can say that I have searched the entire 'world wide web' and
> haven't found 'complete  and clear answers' to the often asked
> question of:
> Given a Xen (release) build (say 3.2.0), which by default tries to get
> and build and assume Linux kernel-xen 2.6.18 from the mercurial
> repository, HOW TO override the build and make it work with a
> 'different' xenified Linux source tree (kernel-xen) say Fedora
Core 8
> kernel-xen

If you are using a pre-patched kernel from a distribution, your better
off building that independently from Xen. Why not just build the
Hypervisor and tools while skipping the kernel?

make XEN_TARGET_ARCH=arch xen
make XEN_TARGET_ARCH=arch tools
make XEN_TARGET_ARCH=arch install-xen
make XEN_TARGET_ARCH=arch install-tools

... of course add docs to that if you want them.

Then build / configure your kernel outside of the Xen source tree, via
whatever means your packager provides.

I use Ubuntu's Hardy and Intrepid kernel trees which (1) requires Git
and (2) uses the debuild / debian helpers.. its very impractical to try
to include it in the Xen build because many extra steps are needed.

You will still easily be able to produce .deb / .rpm packages of your
own if you use the 'checkinstall' utility or something similar.

[Jithendra B] Minor correction in the original post (to help searches resulting from this keywords!).
For the Fedora Core kernel-xen package revision, I mistakenly typed "kernel-xen" when I meant to type "> kernel-xen"
(it is .21 and not .23)
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