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Use IOMMU even when not doing device pass-through?


Hi all,

We're running a KVM based OpenStack cloud. I recently realised we don't
have the IOMMU turned on in our hypervisors. All indications I know about
and can find suggest it's only really useful if you want guests accessing
host devices directly, e.g., PCI pass-through. But I wonder if there are
any other performance advantages to be gained...? Virtio, for one, doesn't
seem to use this/need this.


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