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RE: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>, Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking
From: "Han, Weidong" <weidong.han@xxxxxxxxx>
Date: Mon, 25 Jan 2010 22:13:01 +0800
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Cc: "Cihula, Joseph" <joseph.cihula@xxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>
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Thread-topic: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking
Agree. It should not crash Xen by default due to BIOS issues. warn-and-disable 
is better. It won't impact common Xen users, and if a user really wants to use 
VT-d, he can try iommu=workaround_bogus_bios, or directly report to OEM vendor 
to get it fixed in BIOS. As VT-d is used more and more widely, I think the BIOS 
issues will be found and fixed more quickly than before, thus the situation 
should be better.


-----Original Message-----
From: Keir Fraser [mailto:keir.fraser@xxxxxxxxxxxxx] 
Sent: Monday, January 25, 2010 9:43 PM
To: Sander Eikelenboom; Han, Weidong
Cc: Noboru Iwamatsu; xen-devel@xxxxxxxxxxxxxxxxxxx; Cihula, Joseph; Kay, Allen M
Subject: Re: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking

On 25/01/2010 10:45, "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx> wrote:

> a) Could be discussed if panic should be default instead of disabling iommu or
> not, although there seem to be a lot of broken bioses, so that would lead to a
> lot of machines not booting.

Absolutely not acceptable. Warn and completely disable IOMMU is the correct
default causing least pain to the most end users.

 -- Keir

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