I have survey some I/O virtualization things. And I found that IOMMU is a key hardware component for hardware-assisted I/O virtaulization.
How about the ARM SMMU? Is there any difference between ARM SMMU and x86 IOMMU?
Thanks!
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Well, clearly there will be, much like the architectural differences between an ARM MMU and an x86 MMU. Since you haven't asked a specific question, I'd suggest looking at [ARM's architecture](http://infocenter.arm.com/help/topic/com.arm.doc.subset.architecture.memory/index.html) vs. [Intel's architecture](http://www.intel.com/content/www/us/en/intelligent-systems/intel-technology/vt-directed-io-spec.html) for whatever you're interested in. – Notlikethat Jul 12 '14 at 12:27
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The x86 I/O MMU is typically per device. [tag:trust-zone] is structured to give the CPU some capabilities to dynamically switch device permissions. Here, ARM delegates the protection to each master and slave device with the bus controller propagating the permission; but only allowing *secure* and *normal*. The *smmu* looks like it tries to provide multiple permissions. – artless noise Jul 16 '14 at 14:50