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

To: weidong.han@xxxxxxxxx, keir.fraser@xxxxxxxxxxxxx
Subject: Re: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking
From: Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>
Date: Tue, 26 Jan 2010 10:16:38 +0900
Cc: linux@xxxxxxxxxxxxxx, joseph.cihula@xxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx, allen.m.kay@xxxxxxxxx
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Weidong, Keir,

I agree your suggestions.


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
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.


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