Hi, Was tracing the buffer handling code flow after the kick has been initiated from the guest in case of virtio.
Found this function cpu_physical_memory_map->address_space_map->address_space_translate which calls address_space_translate_internal and iommu->translate (get the translation from TLB) to get the corresponding host virtual address where I think the packet buffer is mapped to (from guest physical to host virtual). So, should I conclude that there is no hardware IOMMU involved in this translation. QEMU maintains its own TLB and translation mapping which is used. Or iommu->translate leads to hardware MMU call. We are developing a high speed packet transfer mechanism using infiniband cards. So, trying to analyse every possible bottleneck. Confused here, please suggest. Anshul Makkar www.justkernel.com
