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Re: [Xen-devel] [PATCH] AMD IOMMU: Use global interrupt remapping table

To: Wei Wang2 <wei.wang2@xxxxxxx>
Subject: Re: [Xen-devel] [PATCH] AMD IOMMU: Use global interrupt remapping table by default
From: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
Date: Thu, 21 Jul 2011 10:07:40 +0100
Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Wed, Jul 20, 2011 at 4:56 PM, Wei Wang2 <wei.wang2@xxxxxxx> wrote:
> George & Ian,
> Patch attached. This patch removes global interrupt remapping table and uses
> per-device table instead. This should work with per-cpu IDTs.  We are safe to
> remove global table since SATA device id issue dose not appear in recent
> production BIOS.

Exactly how "recent" are these BIOSes?  Or I guess alternately, how
old are the BIOSes that broke?

We still have customers who seem to have hardware that's several years
old; if the answer isn't something like "8 years", it may be better to
just change the default setting.


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