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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 15:36:01 +0100
Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Thu, Jul 21, 2011 at 11:38 AM, Wei Wang2 <wei.wang2@xxxxxxx> wrote:
> On Thursday 21 July 2011 11:07:40 George Dunlap wrote:
>> 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?
> George,
> Actually, we encountered this issue about 2 years ago and fixed this in BIOS.
> There should be very less productions shipped the mark at that time (probably
> none) and all newer products after that should absorb this fix. Even without
> BIOS fix, user can always disable IDE mode from BIOS menu manually if they
> were hit by this issue. So basically, I think removing global table is also
> reasonable.

Sounds reasonable to me.

Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

> Thanks
> Wei
>> 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.
>>  -George
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