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