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

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Message-ID: <50CCF6DB.7080204@gmail.com>
Date:	Sat, 15 Dec 2012 16:16:59 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Don Dutile <ddutile@...hat.com>
CC:	Jason Gao <pkill.2012@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, kvm <kvm@...r.kernel.org>
Subject: Re: DMAR and DRHD errors[DMAR:[fault reason 06] PTE Read access is
 not set] Vt-d & intel_iommu

On 12/14/2012 03:32 PM, Don Dutile wrote:
> On 12/13/2012 04:50 AM, Jason Gao wrote:
>> 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.
>
> DMAR table does not have an entry for this device to this region.
> Once the driver reconfigs/resets the device to stop polling bios-boot
> cmd rings and use (new) OS (dma-mapped) rings, there's a period of time
> during this transition that the hw is babbling away to an area that is no
> longer mapped.

Maybe some kind of boot PCI quirk is needed to stop the device DMA 
activity before enabling the IOMMU?

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