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

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Message-ID: <20131011165622.GC32133@srcf.ucam.org>
Date:	Fri, 11 Oct 2013 17:56:22 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Richard Weinberger <richard.weinberger@...il.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 12:53:51PM -0400, Vivek Goyal wrote:
> On Fri, Oct 11, 2013 at 05:44:00PM +0100, Matthew Garrett wrote:
> > I have /dev/mem and a list of addresses I want to modify.
> 
> Why to boot in a second kernel to modify first kernel's RAM. Why not
> do it directly from the first kernel itself (until and unless we want
> first kernel to be stopped while doing those modifications).

Because the kernel in question won't let me do that.

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