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[Xen-users] Xen 3.2.1, Intel DQ35JO tips

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: "Jefferson E. Noxon" <jeff@xxxxxxxxxxxxxx>
  • Date: Thu, 22 May 2008 09:48:08 -0500
  • Delivery-date: Thu, 22 May 2008 07:48:42 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Openpgp: id=5E4D6A46

I thought I'd pass along a few tips for getting the Intel DQ35JO motherboard to play nice with Xen:

1. The dom0 kernel won't boot with CONFIG_PCI_MMCONFIG enabled.

If you get a hang during boot after seeing this message:

        ACPI: PCI Root Bridge [PCI0] (0000:00)

...then MMCONFIG is your problem.

Some kernels seem to support a pci=nommconfig option, but my Gentoo 2.6.21 Xen kernel didn't. The solution was to build the kernel without MMCONFIG. A temporary workaround is to boot with acpi=off, but you won't get SMP support if you turn off ACPI.

(Confirmed with BIOS 0882 and 0559)

2. The on-board 82566DM-2 Ethernet chip is supported by the e1000e driver, not the old e1000 driver. You can get it from Sourceforge. (I'm running kernel 2.6.21)

3. VT-d is not available unless you enable it on the Xen command line (not just in the BIOS). Xen prints a non-intuitive error message suggesting that VT-d is not available, when in fact it's just not turned on.

4. The AMT/vPro management function seems to work just fine with Xen & Linux

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