Implement the SMMUv3 equivalent of d346180e70b9 ("iommu/arm-smmu: Treat all device transactions as unprivileged"), so that once again those pesky DMA controllers with their privileged instruction fetches don't unexpectedly fault in stage 1 domains due to VMSAv8 rules. Acked-by: Will Deacon <will.deacon@xxxxxxx> Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx> --- drivers/iommu/arm-smmu-v3.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 52860bcf80f2..0c45c1e02e04 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -267,6 +267,9 @@ #define STRTAB_STE_1_SHCFG_INCOMING 1UL #define STRTAB_STE_1_SHCFG_SHIFT 44 +#define STRTAB_STE_1_PRIVCFG_UNPRIV 2UL +#define STRTAB_STE_1_PRIVCFG_SHIFT 48 + #define STRTAB_STE_2_S2VMID_SHIFT 0 #define STRTAB_STE_2_S2VMID_MASK 0xffffUL #define STRTAB_STE_2_VTCR_SHIFT 32 @@ -1068,7 +1071,9 @@ static void arm_smmu_write_strtab_ent(struct arm_smmu_device *smmu, u32 sid, #ifdef CONFIG_PCI_ATS STRTAB_STE_1_EATS_TRANS << STRTAB_STE_1_EATS_SHIFT | #endif - STRTAB_STE_1_STRW_NSEL1 << STRTAB_STE_1_STRW_SHIFT); + STRTAB_STE_1_STRW_NSEL1 << STRTAB_STE_1_STRW_SHIFT | + STRTAB_STE_1_PRIVCFG_UNPRIV << + STRTAB_STE_1_PRIVCFG_SHIFT); if (smmu->features & ARM_SMMU_FEAT_STALLS) dst[1] |= cpu_to_le64(STRTAB_STE_1_S1STALLD); -- 2.8.1.dirty -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html