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iommu: Add IOMMU index concept to IOMMU API
If an IOMMU supports mappings that care about the memory transaction attributes, then it no longer has a unique address -> output mapping, but more than one. We can represent these using an IOMMU index, analogous to TCG's mmu indexes. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-id: 20180604152941.20374-2-peter.maydell@linaro.org
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