Hi Frank, On Tue, Oct 21, 2014 at 01:57:25PM +0200, Frank Blaschka wrote: > Add a basic iommu for the s390 platform. The code is pretty simple > since on s390 each PCI device has its own virtual io address space > starting at the same vio address. Are there any limitations on IOVA address space for the devices or can be really any system physical address mapped starting from 0 to 2^64? > For this a domain could hold only one pci device. This bothers me, as it is not compatible with the IOMMU-API. I looked a little bit into how the mappings are created, and it seems there is a per-device dma_table. Is there any reason a dma_table can't be per IOMMU domain and assigned to multiple devices at the same time? Otherwise the code looks quite simple and straight forward. Joerg -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
