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`--serial` still accepted `iommu=on|off` from the shared serial/console configuration shape, even though only virtio-console has a meaningful IOMMU connection. Cloud Hypervisor wires virtio-iommu support through DMA-capable virtio/VFIO PCI endpoints. The serial devices are legacy UARTs accessed through PIO or MMIO registers, so exposing an IOMMU option there is misleading. On-behalf-of: Philipp Schuster@sap.com Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>