I am just a newbie in Red Hat/Linux VM - KVM. I don’t think I can be of help here. You could ask one of the EU Red Hat representatives from the business card included for better help.

IOMMU stands for Input-Output Memory Management Unit. It connects i/o devices to the DMA bus the same way processor is connected to the memory via the DMA bus - https://en.wikipedia.org/wiki/Input%E2%80%93output_memory_management_unit. To me although I am not an expert the…

Far from being an expert, my opinion is that the positive sides of KVM are: Lower costs and open-source which gives the abilities to customize it according to the specific needs of each customer.