Hello, I am sorry, if I am asking this in a wrong place. I have an legacy custom PCI board, which requires contiguous DMA memory region (about 4 MB) and does not support scatter/gather. As contiguous DMA region cannot be allocated with the guaranty, currently, the issue is solved by using mem= kernel command line argument and using 'hidden memory' within first 3GB of RAM. Happily, I have the kernel module source codes. I am not quite familiar with the internals of IOMMU. The question is the following. Is it possible to use IOMMU to emulate contiguous DMA region consisted of smaller chunks on the other side? If it is possible in theory, how could my PCI device driver use existing kernel API to implement this? Thank you. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
