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

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Message-ID: <20131011154450.GB2772@redhat.com>
Date:	Fri, 11 Oct 2013 11:44:50 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Daniel Kiper <daniel.kiper@...cle.com>, ebiederm@...ssion.com,
	hbabu@...ibm.com, hpa@...ux.intel.com, keescook@...omium.org,
	kexec@...ts.infradead.org, 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 04:37:27PM +0100, Matthew Garrett wrote:
> On Fri, Oct 11, 2013 at 08:52:06AM -0400, Vivek Goyal wrote:
> > On Fri, Oct 11, 2013 at 01:04:55PM +0200, Daniel Kiper wrote:
> > 
> > [..]
> > > > In theory you can swap between to kernels with the preserve_context
> > > > case.  Technically I like the ability but I don't know that it has ever
> > > > achieved much uptake.
> > > 
> > > I think that this is nice idea too. However, I have not seen its usage in real.
> > > Even once there was an idea to remove that stuff from Linux Kernel.
> > 
> > I have not seen anybody using it. I don't even know if it works or not.
> 
> It works. I'm using it.

Hi Matthew,

Just Curious. How is it useful. IOW, what's your use case of booting a new
kernel and then jumping back.

Thanks
Vivek
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