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3a1db7a86b
by enabling IOMMU on the default PCI segment. For hotplug to work we need a virtualized iommu and clh exposes one if there is some device or PCI segment that requests it. I would have preferred to add a separate PCI segment for hotplugging vfio devices but unfortunately kata assumes there is only one segment all over the place. See create_pci_root_bus_path(), split_vfio_pci_option() and grep for '0000'. Enabling the IOMMU on the default PCI segment requires passing enabling IOMMU on every device that is attached to it, which is why it is sprinkled all over the place. CLH does not support IOMMU for VirtioFs, so I've added a non IOMMU segment for that device. Signed-off-by: Jeremi Piotrowski <jpiotrowski@microsoft.com>