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Re: [Xen-devel] feature suggestion: DMAR table emulation for Xen

To: Barde Kaushik 00901718 <kbarde@xxxxxxxxxx>
Subject: Re: [Xen-devel] feature suggestion: DMAR table emulation for Xen
From: Joanna Rutkowska <joanna@xxxxxxxxxxxxxxxxxxxxxx>
Date: Fri, 14 May 2010 12:16:36 +0200
Cc: "Han, Weidong" <weidong.han@xxxxxxxxx>, "Cihula, Joseph" <joseph.cihula@xxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On 05/14/2010 11:41 AM, Barde Kaushik 00901718 wrote:
> << So, if we took a DMAR from a platform, say PM45+ICH9M w/ Intel
> BIOS, it should also work fine on any other laptop with this chipset
> (and probably other variants too), just minus the potential 
> BIOS-specific-dirty-tricks...?
> Bringing-up mobile variants with same base BIOS may not work, at
> least in my experience, as OEMs tend to add various custom features
> (GPIO). These features may to over-ride RMRR assumptions from base
> BIOS. This tends to be the most prominant cause behind RMRR issues.
And what would happen if we ignore RMRRs on such a system?


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