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Re: [Xen-devel] capturing windows crash dumps

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>, Paul Durrant <Paul.Durrant@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] capturing windows crash dumps
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Thu, 20 Aug 2009 11:22:13 +0100
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On 20/08/2009 10:56, "James Harper" <james.harper@xxxxxxxxxxxxxxxx> wrote:

> I like #2 best for the following reasons:
> . qemu needs patching for a second serial port anyway. I don't want to
> use the primary as I'm already using it for something else in the
> environment I'm thinking of.
> . much more efficient
> . works with PV (irrelevant though if there are no PV domains that
> support writing out a dump file)
> . easy for the DomU to tell if there is something waiting to capture the
> crash dump (no parameter present = no crash dump)
> . less code on the windows side of things, vs trying to access the
> serial port hardware directly for which there is no 'blessed' mechanism
> to do in a crash dump environment afaik

Well, obviously you can knock up #2 yourself, with an accompanying little
dom0 daemon, which you can ship with the GPLPV drivers. The two components
can communicate via xenstore at start-of-day to prime themselves for later
possible crash dumps.

 -- Keir

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