[Xen-users] More PCI Passthrough Questions

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

Seems like it's the only thing I ask about these days :-).  I'm having some 
more troubles with PCI pass-through.  I finally did get the processors with the 
VTd technology, and that seems to be working fine.  I'm running on a Dell 
PowerEdge R310, however, and am seeing a situation where, as soon as I try to 
start an HVM domU with PCI devices passed through, my network interface goes 
haywire and starts spewing packets onto the network.  It eventually renders 
just about everything attached to the same switch unusable.  

I'm not certain, but I think this may be related to PCI IRQ sharing.  If I look 
at dmesg output, I see that my on-board network card gets assigned the same IRQ 
as the PCIe serial card I'm trying to pass through to my domU.  Can anyone 
confirm that this is the case, and suggest any options?  The BIOS on the PE 
R310 doesn't have a lot of configuration - it'll let you assign some IRQs, but 
it ties quite a few of the devices together on the same IRQs and does not let 
you separate them.

Thanks, in advance, for any help!
-Nick



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