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Re: Use IOMMU even when not doing device pass-through?


On 05/16/13 22:43, Blair Bethwaite wrote:
> 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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No, it's generally only for device pass-through.

-- Matthew Thode (prometheanfire)

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