48-bit VA support in the SMMU

Will Deacon will.deacon at arm.com
Thu Nov 20 02:08:22 PST 2014

On Thu, Nov 20, 2014 at 01:25:18AM +0000, Varun Sethi wrote:
> What specific tweaks are required in the arm-smmu driver? I thought that
> the upstream arm-smmu (3.18-rc3) driver does support 48 bit input address
> (depended on the ARM64 kernel 48 bit support). Isn't this dependent on the
> VA_BITS?  

Yeah, but it won't work for stage-2 mappings. I'm currently rewriting the
page table code to allow this (see my iommu/pgtbl branch).


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