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Re: [Xen-devel] DQ35JO (Q35 chipset), Q6600, xen-unstable (~12/21), RMRR

To: "Peter J. van der Maas" <peter@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] DQ35JO (Q35 chipset), Q6600, xen-unstable (~12/21), RMRR/DMAR error
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: 2008年12月23日 08:45:08 +0000
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You could remove the check at the top of acpi_parse_one_rmrr() in xen/drivers/passthrough/vtd/dmar.c and then cross your fingers. It depends just how broken the BIOS tables are.

-- Keir

On 23/12/2008 05:29, "Peter J. van der Maas" <peter@xxxxxxxxx> wrote:

Purchased DQ35JO on Vt-d/PCI passthrough wiki’s recommendations. Built latest xen-unstable and am getting the following via ‘xm dmesg’:

(XEN) [VT-D]dmar.c:374: RMRR error: base_addr d0000000 end_address cfffffff
(XEN) Failed to parse ACPI DMAR. Disabling VT-d.


My grub.conf looks like this:

kernel /xen.gz vga=mode-0x0317 vtd=1 iommu=1
module /vmlinuz-2.6.18.8-xen ro root=/dev/XenVolGroup/LogVolXenDom0 rhgb quiet pciback.hide=(01:00.0)
module /initrd-2.6.18-xen.img

I found a similar post from a user that had same problem with same board after updating his BIOS to v954. Not sure I want to lose the functionality the update BIOS gives me. Any fixes or workarounds?
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