linux-kernel - Re: kexec: Clearing registers just before jumping into purgatory

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Message-ID: <20131011170138.GA32619@srcf.ucam.org>
Date:	Fri, 11 Oct 2013 18:01:39 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Richard Weinberger <richard@....at>
Cc:	Richard Weinberger <richard.weinberger@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, hbabu@...ibm.com,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Kees Cook <keescook@...omium.org>, kexec@...ts.infradead.org,
	LKML <linux-kernel@...r.kernel.org>, david.vrabel@...rix.com,
	jbeulich@...e.com, keir@....org, xen-devel@...ts.xen.org
Subject: Re: kexec: Clearing registers just before jumping into purgatory

On Fri, Oct 11, 2013 at 06:59:41PM +0200, Richard Weinberger wrote:
> Am 11.10.2013 18:55, schrieb Matthew Garrett:
> > On Fri, Oct 11, 2013 at 06:47:19PM +0200, Richard Weinberger wrote:
> > 
> >> But you still need a magic tool which create you this list.
> > 
> > I just read /proc/kallsyms. I'm really not doing anything complicated.
> > 
> >> If you have a tool which takes two kernel images and create such
> >> a delta, fine.
> > 
> > Isn't that ksplice?
> 
> So, you have a variant of ksplice which is able to kexec?

No, I manually look up some addresses from /proc/kallsyms and then 
modify them in the second kernel.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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