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Re: [Xen-users] VT-d... I think is working?

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Subject: Re: [Xen-users] VT-d... I think is working?
From: Daniel Kao <dkao@xxxxxxxxxxxx>
Date: Mon, 21 Jul 2008 15:34:46 -0700
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Hi Mark!

Thanks for the reply and clarification!

Just an update to all on the list, I decided to use the stock Xen linux kernel from CentOS and only recompiled Xen 3.2.1 itself in another thread which I started and updated here on Xen-users.  The recompiled kernel based off of the CentOS source worked, but it was behaving a bit "odd" so I blew it all away and started over.  Turns out I didn't need to recompile the CentOS kernel to add VT-d support.  I would of liked to have pciback module compiled directly into the CentOS kernel, but I'm just unbinding things at boot and loading the pciback module manually upon startup... which works fine for me!

Thanks, all!


Mark Williamson wrote:
Hi Daniel,

On Friday 18 July 2008, Daniel Kao wrote:
 Hi All,

 I haven't tried to pciback a device yet and setup an HVM but finally got
to a point where I think I have VT-d working, but wanted to make sure this
looks right from my "xm dmesg" output:

 (XEN) Intel VT-d has been enabled


 (XEN) xenoprof: Initialization failed. Intel processor model 23 for P6
class family is not supported (XEN) [VT-D]intel-iommu.c:1204:d32767
context_context_mapping: nested PCI bridge not supported: bdf = 0:1:0
sec_bus = 1 sub_bus = 3 (XEN) [VT-D]intel-iommu.c:1226:d32767
domain_context_mapping:bus2bridge[2].bus != 0 (XEN)
[VT-D]intel-iommu.c:771: iommu_page_fault: iommu->reg = ffff828bfff57000
(XEN) [VT-D]intel-iommu.c:754: iommu_page_fault:DMA Write: DEVICE 0:2.0
addr 0 REASON 5 (XEN) print_vtd_entries: domain_id = 7fff bdf = 0:2:0 gmfn
= 0
 (XEN)     hg->pgd == NULL
 (XEN) AMD IOMMU: Disabled

 Only concerns I have are:

 (XEN) xenoprof: Initialization failed. Intel processor model 23 for P6
class family is not supported

That's nothing to do with VT-d, Xenoprof is a profiling app (e.g. for 
conducting performance analyses, etc).  Don't worry about it :-)


 I have an E8400 on an Intel DQ35JO motherboard and the references to
iommu_page_fault but I think that's just info and nothing else? 

reference, this is on CentOS 5.2 w/custom Xen kernel I built using CentOS
xen kernel source (2.6.18-92.1.6.el5-xen-x86_64) with Xen 3.2.1 tarball.


Daniel Kao
Übermind, Inc.
Seattle, WA, U.S.A.
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