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

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking
From: Weidong Han <weidong.han@xxxxxxxxx>
Date: Mon, 25 Jan 2010 22:12:40 +0800
Cc: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>, "Cihula, Joseph" <joseph.cihula@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
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Keir Fraser wrote:
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


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.

Regards,
Weidong

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