Hi s390 folks/Matthew Since everyone is looking at iommu support for the nested domains, could we also tackle the default domain conversion please? s390 is one of the last 4 drivers that need it. >From what I can see it looks like when detach_dev() is called it expects the platform's dma_ops to work in arch/s390/pci/pci_dma.c ? Has anyone thought about converting the dma_ops to use the normal DMA API iommu support and run it through the iommu driver instead of through the dma_ops? Alternatively perhaps we can keep the dma_ops with some iommu side-change. Thanks, Jason