Re: [Xen-users] is Intel VT-d "really" necessary?

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

> 
> Apologies in advance for hyjacking your thread, but this is an
> interesting question.
> 
> For cases where PCI passthougth is the heart of the application, is it
> better to use hvm/VTd or pv-ops/iommu=soft? Or is there some other
> combination where you can still leverage VTd from pv-ops?
> 

I believe that PV (pv-ops) can still leverage VTd, and will, by default, if 
it's present.  If it's not present, you have to use iommu=soft.

-Nick



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