spapr_iommu: Introduce bus_offset in sPAPRTCETable
This adds @bus_offset into sPAPRTCETable to tell where TCE table starts from. It is set to 0 for emulated devices. Dynamic DMA windows will use other offset. Signed-off-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: NAlexander Graf <agraf@suse.de>
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