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RE: [Xen-devel] We still have to disable vtd for old chipset?

  • To: "Neo Jia" <neojia@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
  • Date: Tue, 3 Jun 2008 08:19:34 -0700
  • Delivery-date: Tue, 03 Jun 2008 08:20:02 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcjFFUMOAzp1dFKWSnKydZBOcYqDegAd5SDQ
  • Thread-topic: [Xen-devel] We still have to disable vtd for old chipset?

This check was needed as some earlier versions of server platform does
not support p2m/vt-d page table sharing.

Since now we have separate page tables, we don't need that check
anymore.  You can just remove the check locally to get it to work on
your system.

We will submit a patch to remove it in the upstream. 


>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
>[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Neo Jia
>Sent: Monday, June 02, 2008 6:01 PM
>To: xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: [Xen-devel] We still have to disable vtd for old chipset?
>I am seeing the following error message in xm dmesg.
>(XEN) [VT-D]utils.c:59: *** VT-d disabled - pre C0-step Seaburg found
>(XEN) [VT-D]utils.c:62: ***  vendor = 8086 device = 4000 revision = 10
>This is on Dell T7400. And the change is
>So, I am wondering if there is any fix for this?
>I would remember that if researchers were not ambitious
>probably today we haven't the technology we are using!
>Xen-devel mailing list

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