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[Xen-bugs] [Bug 1418] New: Xen 3.3.1 and infinite loop on X48 MB

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Subject: [Xen-bugs] [Bug 1418] New: Xen 3.3.1 and infinite loop on X48 MB
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Date: Sun, 15 Feb 2009 16:02:55 -0800
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           Summary: Xen 3.3.1 and infinite loop on X48 MB
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux-2.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: nfrey@xxxxxxxxxxxxxxxxx

Hi !

I had what seems to be a bug with vt-d on xen 3.3.1 on a C2SBX+ supermicro MB
(vt-d activated), CPU Q9550.
When I boot on Xen I can see these two lines in xm dmesg :

(XEN) Cannot handle page request order 0!
(XEN) Failed to parse ACPI DMAR.  Disabling VT-d.

Xen does start OK, excepting that vt-d isn't working.
I digged as deep as my knowledge allowed me to do, so I saw :
In the dmar.c file (xen/drivers/passthrough/vtd/) there is an infinite loop on
line 460 while. The variables tested don't grow, so it loops until the heap is
full, then elegantly unhook and continue. 

I would be pleased to collaborate to the resolution of this bug and is at
disposal for any more information.

Nicolas Frey

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