On 16/09/2019 19:15, Russell King - ARM Linux admin wrote: > The platform has an iommu, which is in pass-through mode, via > arm_smmu.disable_bypass=0. Could be 954a03be033c7cef80ddc232e7cbdb17df735663 "iommu/arm-smmu: Break insecure users by disabling bypass by default" Although it had already landed in v5.2 Regards.