<div dir="ltr">Libvirt usb passthrough also doesn't need this.</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, May 17, 2013 at 1:29 PM, Matthew Thode <span dir="ltr"><<a href="mailto:prometheanfire@gentoo.org" target="_blank">prometheanfire@gentoo.org</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">On 05/16/13 22:43, Blair Bethwaite wrote:<br>
> Hi all,<br>
><br>
> We're running a KVM based OpenStack cloud. I recently realised we don't<br>
> have the IOMMU turned on in our hypervisors. All indications I know about<br>
> and can find suggest it's only really useful if you want guests accessing<br>
> host devices directly, e.g., PCI pass-through. But I wonder if there are<br>
> any other performance advantages to be gained...? Virtio, for one, doesn't<br>
> seem to use this/need this.<br>
><br>
><br>
><br>
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><br>
No, it's generally only for device pass-through.<br>
<span class="HOEnZb"><font color="#888888"><br>
--<br>
-- Matthew Thode (prometheanfire)<br>
<br>
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