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Re: [Xen-devel] Workaround for the corrupted Intel X48 DMAR table

To: Neo Jia <neojia@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Workaround for the corrupted Intel X48 DMAR table
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Mon, 14 Jul 2008 08:14:18 +0100
Cc: "Zhao, Yu" <yu.zhao@xxxxxxxxx>, "Han, Weidong" <weidong.han@xxxxxxxxx>, Jean Guyader <jean.guyader@xxxxxxxxxxxxx>
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On 14/7/08 07:47, "Neo Jia" <neojia@xxxxxxxxx> wrote:

In line:  0100: 00 00 00 80 00 00 00 00 ff ff ff 7f 00 00 00 00, the RMRR reserved memory region starting address is even higher than its limit address.

Is there anyway to do a software workaround for this issue? I tried to simply ignore that entry in the "acpi_parse_one_rmrr" function, but I hit a panic in function "iommu_enable_translation".


This kind of thing makes me quite uneasy about enabling VT-d by default in Xen 3.3. I’m quite tempted to require ‘iommu’ on the command line to enable it.

 -- Keir
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