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: <CANmqhJBAxzVa5Ds0gojnYDDku5UbXGwfCNC=+z3XmVonF-_j2w@mail.gmail.com>
Date:	Fri, 14 Dec 2012 10:01:16 +0800
From:	Jason Gao <pkill.2012@...il.com>
To:	Alex Williamson <alex.williamson@...hat.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 Fri, Dec 14, 2012 at 12:23 AM, Alex Williamson
<alex.williamson@...hat.com> wrote:
>
> Device 03:00.0 is your raid controller:
>
> 03:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 1078 (rev 04)
>
> For some reason it's trying to read from ffe65000, ffe8a000, ffe89000,
> ffe86000, ffe87000, ffe84000.  Those are in reserved memory regions, so
> it's not reading an OS allocated buffer, which probably means it's some
> kind of side-band communication with a management controller.  I'd guess
> it's a BIOS bug and there should be an RMRR covering those accesses.
> Thanks,

First of all ,I want to known whether I can ignore these errors on the
production server,and do these error may affect the system?

By the way,when I removed the "intel_iommu=on" from /etc/grub.conf,no
DMAR related errors occur

It's a strange thing,other three Dell R710 servers with the same bios
version v. 6.3.0, same kernel 2.6.32-279.14.1 on RHEL6u3(Centos 6u3)
,but these errors don't appear on these tree servers

Anyone have any idea for this ?

thanks
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