An architecture protecting the guest memory against unauthorized host access may want to enforce VIRTIO I/O device protection through the use of VIRTIO_F_IOMMU_PLATFORM. Let's give a chance to the architecture to accept or not devices without VIRTIO_F_IOMMU_PLATFORM. Pierre Morel (1): s390: virtio: let arch accept devices without IOMMU feature arch/s390/mm/init.c | 6 ++++++ drivers/virtio/virtio.c | 9 +++++++++ include/linux/virtio.h | 2 ++ 3 files changed, 17 insertions(+) -- 2.25.1 Changelog to v2: - put the test in virtio_finalize_features() (Connie) - put the test inside VIRTIO core (Jason) - pass a virtio device as parameter (Halil)