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Enable IOMMUFD and VFIO cdev such that PCI pass-through to QEMU/KVM can optionally utilize native IOMMUFD. Note that because the defconfigs do not enable IOMMUFD_VFIO_CONTAINER the default PCI pass-through using VFIO with the existing container interface is not affected. Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Acked-by: Matthew Rosato <mjrosato@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>