linux-kernel - Re: [PATCH v2 01/11] kexec: introduce kexec

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Message-ID: <50AE6542.3020302@zytor.com>
Date:	Thu, 22 Nov 2012 09:47:46 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Daniel Kiper <daniel.kiper@...cle.com>, andrew.cooper3@...rix.com,
	jbeulich@...e.com, konrad.wilk@...cle.com, mingo@...hat.com,
	tglx@...utronix.de, x86@...nel.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com
Subject: Re: [PATCH v2 01/11] kexec: introduce kexec_ops struct

The other thing that should be considered here is how utterly 
preposterous the notion of doing in-guest crash dumping is in a system 
that contains a hypervisor.  The reason for kdump is that on bare metal 
there are no other options, but in a hypervisor system the right thing 
should be for the hypervisor to do the dump (possibly spawning a clean 
I/O domain if the I/O domain is necessary to access the media.)

There is absolutely no reason to have a crashkernel sitting around in 
each guest, consuming memory, and possibly get corrupt.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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