linux-kernel - Re: [RFC] ELF Relocatable x86 and x86

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Date:	Wed, 2 Aug 2006 15:34:39 +0900
From:	"Magnus Damm" <magnus.damm@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	fastboot@...l.org, linux-kernel@...r.kernel.org,
	Horms <horms@...ge.net.au>,
	"Jan Kratochvil" <lace@...kratochvil.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Vivek Goyal" <vgoyal@...ibm.com>, "Linda Wang" <lwang@...hat.com>
Subject: Re: [RFC] ELF Relocatable x86 and x86_64 bzImages

On 8/1/06, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> The problem:
>
> We can't always run the kernel at 1MB or 2MB, and so people who need
> different addresses must build multiple kernels.  The bzImage format
> can't even represent loading a kernel at other than it's default address.
> With kexec on panic now starting to be used by distros having a kernel
> not running at the default load address is starting to become common.
>
> The goal of this patch series is to build kernels that are relocatable
> at run time, and to extend the bzImage format to make it capable of
> expressing a relocatable kernel.

Nice work. I'd really like to see support for relocatable kernels in
mainline (and kexec-tools!).

Eric, could you please list the advantages of your run-time relocation
code over my incomplete relocate-in-userspace prototype posted to
fastboot a few weeks ago?

One thing I know for sure is that your implementation supports bzImage
while my only supports relocation of vmlinux files. Are there any
other uses for relocatable bzImage except kdump?

Thanks!

/ magnus
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