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Re: [Xen-users] Re: VT-D On An Asus P5E-VM DO

To: Christian Tramnitz <chris.ace@xxxxxxx>
Subject: Re: [Xen-users] Re: VT-D On An Asus P5E-VM DO
From: Michael MacLeod <mikemacleod@xxxxxxxxx>
Date: Wed, 23 Sep 2009 07:26:00 -0400
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On Wed, Sep 23, 2009 at 5:27 AM, Christian Tramnitz <chris.ace@xxxxxxx> wrote:
Michael MacLeod wrote:
A little googling suggests this is a BIOS issue. I recently upgraded my BIOS to the latest version in order to see if that would resolve a different problem (it didn't), so now I'm wondering if VT-D would be working on an older BIOS revision.

Anyone with an Asus P5E-VM DO and VT-D working care to tell me which revision their BIOS is?

I do have a P5E-VM DO running with VT-d using BIOS 0702.
Good to know it breaks when upgrading, I was tempted to give it a try recently...

I do have error messages like this:
(XEN) [VT-D]iommu.c:722: iommu_page_fault: iommu->reg = ffff828bfff56000
(XEN) [VT-D]iommu.c:691: iommu_fault_status: Fault Overflow
(XEN) [VT-D]iommu.c:694: iommu_fault_status: Primary Pending Fault
(XEN) [VT-D]iommu.c:676: iommu_fault:DMA Write: 0:2.0 addr 400000000 REASON 5 iommu->reg = ffff828bfff56000
(XEN) print_vtd_entries: iommu = ffff83022bde62d0 bdf = 0:2:0 gmfn = 400000
(XEN)     root_entry = ffff83022bdcf000
(XEN)     root_entry[0] = 224cc8001
(XEN)     context = ffff830224cc8000
(XEN)     context[10] = 101_22bdb3001
(XEN)     l3 = ffff83022bdb3000
(XEN)     l3_index = 10
(XEN)     l3[10] = 0
(XEN)     l3[10] not present

But VT-d gets enabled nevertheless and actual pass-through was also working the last time I tried...

Best regards,


I've tried several different BIOS revisions (currently my BIOS is flashed with 0702). Did you build Xen from source and what version are you running? And would you mind posting your relevant grub menu.lst entry? I want to see what options you're passing to Xen at boot.

Still, it's good to know that it should be possible to work around this problem and make it work.

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