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In order to support nested virtualization and nested device passthrough from our CI tests, we need some extra kernel configuration options to be enabled. CONFIG_KVM and CONFIG_VIRTUALIZATION for nested virtualization. CONFIG_VFIO for nested device passthrough. CONFIG_VIRTIO_IOMMU and CONFIG_ACPI_IORT for virtio-iommu support. With all these new options applied, we can leverage virtio-iommu to attach some VFIO devices to it and pass them through a second layer of virtualization. Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>