Guys

If I am getting this correctly what Stefan is talking about the default
xen behaviour, net device emulation works bit differently than the disk
in xen.  If you give the vif "type= ioemu" the host dom0 will not even
try to create a net_back device, and let qemu-dm to create qemu nic (
pretty much like what kvm does for non virtio devices )


This is the reason why you have to create 2 nics with the same mac address with 
"type= ioemu"  and "type=xen (this can be anything except ioemu )", and I think 
this would be the correct behaviour, so the host does not need to know what OS 
is the guest running or weather guest have net_front drivers, and leave it up 
to the guest to pick what device path it wants to use. 

I think you can not do this with xm config (python based client util),
but you can easily do this  in xl config (new C stuff),  or using the
libxl/libxen library.

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https://bugs.launchpad.net/bugs/886521

Title:
  CONFIG_XEN_PLATFORM_PCI should be "y" when building  3.1 kernel

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