KVM: Remove ability to assign a device without iommu support
This option has no users and it exposes a security hole that we can allow devices to be assigned without iommu protection. Make KVM_DEV_ASSIGN_ENABLE_IOMMU a mandatory option. Signed-off-by: NAlex Williamson <alex.williamson@redhat.com> Signed-off-by: NMarcelo Tosatti <mtosatti@redhat.com>
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