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

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Message-ID: <56543412.7090104@citrix.com>
Date:	Tue, 24 Nov 2015 09:55:30 +0000
From:	Malcolm Crossley <malcolm.crossley@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	Juergen Gross <JGross@...e.com>
CC:	<olaf@...fle.de>, <keir@....org>, <andrew.cooper3@...rix.com>,
	<ptesarik@...e.cz>, <linux-kernel@...r.kernel.org>,
	<dslutz@...izon.com>, <anderson@...hat.com>,
	<david.vrabel@...rix.com>, David Mair <DMAIR@...e.com>,
	<xen-devel@...ts.xenproject.org>, <boris.ostrovsky@...cle.com>,
	<crash-utility@...hat.com>
Subject: Re: [Xen-devel] crash tool - problem with new Xen linear virtual
 mapped sparse p2m list

On 24/11/15 08:59, Jan Beulich wrote:
>>>> 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.)
> 
I don't think we can reliably use the m2p for PV domains because
PV domains don't always issue a m2p update hypercall when they change
their p2m mapping.

Malcolm

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@...ts.xen.org
> http://lists.xen.org/xen-devel
> 

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