iommu non-strict mode for arm64

[Josh Poimboeuf]

Hi all,

We've gotten significant slowdowns on arm64 with 4k pages compared to
64k.  The slowdowns can be alleviated by setting iommu.strict=0 or
iommu.passthrough=1.

Is there a reason x86 defaults to lazy iommu, while arm64 does not?  Are
there security implications which are specific to arm64?

-- 
Josh