From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: pv-ops domU not working with MSI interrupts on Nehalem
Date: Fri, 1 Oct 2010 17:11:11 -0400
Message-ID: <20101001211111.GA18244@dumpdata.com>
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To: Bruce Edge <bruce.edge@gmail.com>, Ray.Lin@lsi.com
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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 (2.6.32.18)
 - 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 :-(