linux-kernel - Re: [Xen-devel] [PATCH 2/2] Allow kdump with crash_kexec_post

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Message-Id: <579F54B502000078001013F1@prv-mh.provo.novell.com>
Date:	Mon, 01 Aug 2016 05:55:01 -0600
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"David Vrabel" <david.vrabel@...rix.com>,
	"Petr Tesarik" <PTesarik@...e.com>
Cc:	"JoshTriplett" <josh@...htriplett.org>,
	"maintainer:X86 ARCHITECTURE 32-BIT AND64-BIT" <x86@...nel.org>,
	"ThomasGleixner" <tglx@...utronix.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"open list:KEXEC" <kexec@...ts.infradead.org>,
	"moderated list:XEN HYPERVISOR INTERFACE" 
	<xen-devel@...ts.xenproject.org>,
	"Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
	"Dave Young" <dyoung@...hat.com>, "Ingo Molnar" <mingo@...hat.com>,
	"Juergen Gross" <JGross@...e.com>,
	"open list" <linux-kernel@...r.kernel.org>,
	"Eric Biederman" <ebiederm@...ssion.com>,
	"H.Peter Anvin" <hpa@...or.com>
Subject: Re: [Xen-devel] [PATCH 2/2] Allow kdump with
 crash_kexec_post_notifiers

>>> On 13.07.16 at 14:53, <david.vrabel@...rix.com> wrote:
> On 13/07/16 13:20, Petr Tesarik wrote:
>> If a crash kernel is loaded, do not crash the running domain. This is
>> needed if the kernel is loaded with crash_kexec_post_notifiers, because
>> panic notifiers are run before __crash_kexec() in that case, and this
>> Xen hook prevents its being called later.
> 
> Prioritising the in-kernel kexec image over the hypervisor one seems
> sensible behaviour to me.

For HVM guests certainly; does loading of an in-kernel crash kernel
properly fail for PV guests (and namely PV Dom0), or does such a
setup work nowadays?

Jan