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[Xen-users] problems with xen and sr-iov/iommu

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Subject: [Xen-users] problems with xen and sr-iov/iommu
From: David White <dwhite@xxxxxxxxxxxxx>
Date: Wed, 09 Feb 2011 21:55:27 -0800
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Hi all,

I've fetched the xen 4.0.1 source from the usual spot and have git'd the stable dom0 source (recently) from the jeremy repository, have successfully built and installed each of these on my VT-x and VT-d capable x86_64 system, over a fedora 14 installation. Most of the features seem to be running just fine, but I'm having a real problem getting the virtual functions from my 82576 module to map successfully into my HVMs.

The PCI passthrough feature seems to work fine when I assign the physical functions of the nic to the HVMs. They respectfully see the PCI devices, load the igb drivers on boot and have network access. However when I switch to using the virutal functions (starting with simple case of 'modprobe igb max_vfs=1') the HVMs won't properly boot and end up getting somehow destroyed late in the boot process, just after the igbvf drivers load.

I've got plenty of data/logs to post, but I wanted to check in to see if anyone has a working scenario before I start throwing bits around. Or maybe I should assume that SR-IOV/PCI passthrough doesn't work in xen 4.0.1?


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