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 for kexec@lists.infradead.org; Fri, 11 Oct 2013 15:45:20 +0000
Date: Fri, 11 Oct 2013 11:44:50 -0400
From: Vivek Goyal <vgoyal@redhat.com>
Subject: Re: kexec: Clearing registers just before jumping into purgatory
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To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: keir@xen.org, keescook@chromium.org, Daniel Kiper <daniel.kiper@oracle.com>, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, xen-devel@lists.xen.org, hbabu@us.ibm.com, ebiederm@xmission.com, jbeulich@suse.com, hpa@linux.intel.com, david.vrabel@citrix.com

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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