linux-kernel - Re: [PATCH] x86: Find offset for crashkernel reservation automatically

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Message-ID: <20080627141910.GD5801@redhat.com>
Date:	Fri, 27 Jun 2008 10:19:10 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Bernhard Walle <bwalle@...e.de>
Cc:	x86@...nel.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] x86: Find offset for crashkernel reservation
	automatically

On Fri, Jun 27, 2008 at 04:06:56PM +0200, Bernhard Walle wrote:
> * Vivek Goyal [2008-06-27 09:42]:
> > 
> > Thinking more about. Let me step back. I think it is not good idea to
> > take this kernel take decision about the capability of kernel being
> > loaded. There is no way we can find out now that if a kernel is capable
> > of running from this memory location or not. This is highly variable. So,
> > please ignore above comment.
> 
> Maybe below 4G makes sense. Because you need some 32 bit memory for DMA.
> That's mostly an architecture limitation, so that could make sense to
> check here.
> 

Even if you need some 32bit memory in the lower regions, kexec can handle
it with backup segment mechanism (currently 640K). We can always increse
the backup region size.

So I would think that it is best to leave it without any checking and 
then let kexec-tools handle it.

Thanks
Vivek
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