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

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Message-ID: <50AE69EF.4060909@citrix.com>
Date:	Thu, 22 Nov 2012 18:07:43 +0000
From:	Andrew Cooper <andrew.cooper3@...rix.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	"jbeulich@...e.com" <jbeulich@...e.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"x86@...nel.org" <x86@...nel.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>
Subject: Re: [PATCH v2 01/11] kexec: introduce kexec_ops struct

On 22/11/12 17:47, H. Peter Anvin wrote:
> 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
>

I agree that regular guests should not be using the kexec/kdump. 
However, this patch series is required for allowing a pvops kernel to be
a crash kernel for Xen, which is very important from dom0/Xen's point of
view.

-- 
Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
T: +44 (0)1223 225 900, http://www.citrix.com

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