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RE: [Xen-devel] dom0 pvops crash

To: Pasi Kärkkäinen <pasik@xxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>
Subject: RE: [Xen-devel] dom0 pvops crash
From: Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>
Date: Mon, 25 Jan 2010 18:18:27 +0000
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Cc: Ian, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, Pratt <Ian.Pratt@xxxxxxxxxxxxx>
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Thread-topic: [Xen-devel] dom0 pvops crash
> Here's the hacky fix from last summer:
> http://lists.xensource.com/archives/html/xen-devel/2009-06/msg00519.html
> 
> On my testbox I can trigger that bug just by compiling a kernel in dom0.
> 
> CONFIG_HIGHPTE=n is stable for me, while CONFIG_HIGHPTE=y most probably
> makes dom0 crash during a kernel compile.
> 
> (dom0 and Xen are 32bit PAE)

Even if it worked reliably, CONFIG_HIGHPTE performance would be miserable: It 
takes an operation that is always going to be slow on any virtualized system 
(updating PTEs), and pounds the cr*p out of it...

Ian

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