linux-kernel - DMAR and DRHD errors[DMAR:[fault reason 06] PTE Read access is not set] Vt-d & intel

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Date:	Thu, 13 Dec 2012 17:50:24 +0800
From:	Jason Gao <pkill.2012@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, kvm <kvm@...r.kernel.org>
Subject: DMAR and DRHD errors[DMAR:[fault reason 06] PTE Read access is not
 set] Vt-d & intel_iommu

Dear List:

Description of problem:
After installed Centos 6.3(RHEL6.3) on my Dell R710(lastest
bios:Version: 6.3.0,Release Date: 07/24/2012) server,and updated
lastest kernel "2.6.32-279.14.1.el6.x86_64",I want to use the Intel
82576 ET Dual Port nic's SR-IOV feature,assigning VFs to kvm guest

appended kernel boot parameter: intel_iommu=on,after boot with the
following messages:

Dec 13 16:58:15 2 kernel: DRHD: handling fault status reg 2
Dec 13 16:58:15 2 kernel: DMAR:[DMA Read] Request device [03:00.0]
fault addr ffe65000
Dec 13 16:58:15 2 kernel: DMAR:[fault reason 06] PTE Read access is not set
Dec 13 16:58:15 2 kernel: DRHD: handling fault status reg 102
Dec 13 16:58:15 2 kernel: DMAR:[DMA Read] Request device [03:00.0]
fault addr ffe8a000
Dec 13 16:58:15 2 kernel: DMAR:[fault reason 06] PTE Read access is not set
Dec 13 16:58:15 2 kernel: scsi 0:0:32:0: Enclosure         DP
BACKPLANE        1.07 PQ: 0 ANSI: 5
Dec 13 16:58:15 2 kernel: DRHD: handling fault status reg 202
Dec 13 16:58:15 2 kernel: DMAR:[DMA Read] Request device [03:00.0]
fault addr ffe89000
Dec 13 16:58:15 2 kernel: DMAR:[fault reason 06] PTE Read access is not set

full dmesg detail:
   http://pastebin.com/BzFQV0jU
lspci -vvv full detail:
   http://pastebin.com/9rP2d1br


it's a production server,and I'm not sure if this is a critical
problem,how to fix it,any help would be greatly appreciated.
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