linux-kernel - Re: crash tool - problem with new Xen linear virtual mapped sparse p2m list

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Message-Id: <565434F102000078000B8424@prv-mh.provo.novell.com>
Date:	Tue, 24 Nov 2015 01:59:13 -0700
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Daniel Kiper" <daniel.kiper@...cle.com>,
	"Juergen Gross" <JGross@...e.com>
Cc:	<olaf@...fle.de>, <andrew.cooper3@...rix.com>,
	<david.vrabel@...rix.com>, <xen-devel@...ts.xenproject.org>,
	<boris.ostrovsky@...cle.com>, <konrad.wilk@...cle.com>,
	<anderson@...hat.com>, <crash-utility@...hat.com>,
	"David Mair" <DMAIR@...e.com>, <ptesarik@...e.cz>,
	<dslutz@...izon.com>, <linux-kernel@...r.kernel.org>,
	<keir@....org>
Subject: Re: crash tool - problem with new Xen linear virtual mapped
 sparse p2m list

>>> On 24.11.15 at 07:55, <JGross@...e.com> wrote:
> What about:
> 
> 4) Instead of relying on the kernel maintained p2m list for m2p
>    conversion use the hypervisor maintained m2p list which should be
>    available in the dump as well. This is the way the alive kernel is
>    working, so mimic it during crash dump analysis.

I fully agree; I have to admit that looking at the p2m when doing page
table walks for a PV Dom0 (having all machine addresses in page table
entries) seems kind of backwards. (But I say this knowing nothing
about the tool.)

Jan

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