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Re: [Xen-devel] pv-ops domU not working with MSI interrupts on Nehalem

To: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Subject: Re: [Xen-devel] pv-ops domU not working with MSI interrupts on Nehalem
From: Bruce Edge <bruce.edge@xxxxxxxxx>
Date: Mon, 11 Oct 2010 14:12:22 -0700
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On Fri, Oct 1, 2010 at 2:11 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
> On Mon, Sep 27, 2010 at 08:52:39AM -0700, Bruce Edge wrote:
>> One of our developers who is working on a tachyon driver is
>> complaining that the pvops domU kernel is not working for these MSI
>> interrupts.
>> This is using the current head of xen/2.6.32.x on both a single
>> Nahelam 920 and a dual E5540. This behavior is consistent with Xen
>> 4.0.1, 4.0.2.rc1-pre and 4.1.
> I just checked on my SuperMicro X8DTN, this combination
>  - For Dom0, git commit fe999249 (
>  - For DomU, devel/xen-pcifront-0.6 or devel/xen-pcifront-0.7
>  - For Hypervisor I used cs 21976, but found that the latest (22155) works too
> with which where I passed in PCI devices with legacy IRQ, MSI, and MSI-X. I 
> tried
> a combination of doing this with IOMMU (VT-d) and without - both cases these 
> devices:
> 00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
> Controller #1 (rev 02)
> 00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
> Controller #2 (rev 02)
> 00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI 
> Controller #3 (rev 02)
> 00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI 
> Controller #1 (rev 02)
> 03:00.0 Ethernet controller: Intel Corporation 82572EI Gigabit Ethernet 
> Controller (Copper) (rev 06)
> 0a:00.1 Ethernet controller: Intel Corporation 82575EB Gigabit Network 
> Connection (rev 02)
> worked just fine (either defining pci=["..."] or just using pci-attach).
> But if I use the latest xen/next or xen/stable-2.6.32.x it does not look
> that happy :-(

To try eliminate the remaining differences here, could you post your
dom0/domU config files?
I'd like to build the same kernels to get an apples->apples comparison.

Also, could you include your grub info and domU cfg file?

These may eliminate some of the remaining diffs in the configs and
show why your's works while mine does not.



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