[Xen-devel] iommu=1 by default?

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>]

Would it make sense to make "iommu=1" the default for xen 4.0?

I think Xen is rather more defensive these days about disabling iommu in the 
presence of broken BIOS tables, but there may conceivably still be machines it 
breaks boot on. I can't think of any subtle bugs the IOMMU could introduce if 
it's not explicitly in use by VMs -- and I don't believe anyone has seen any 
performance issues. [We could actually not fully turn the IOMMU on until the 
first VM that demands it.]

Would it make sense to turn it on by default in the release candidates? Or too 
late? 

IOMMU is clearly going to be a widely used feature in this release.

Ian

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