[PATCH v4 8/8] iommu/arm-smmu: Set PRIVCFG in stage 1 STEs
From: Robin Murphy <hidden>
Date: 2016-07-01 16:50:17
Also in:
linux-arm-kernel, linux-iommu
Subsystem:
iommu subsystem, the rest · Maintainers:
Joerg Roedel, Will Deacon, Linus Torvalds
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.
Signed-off-by: Robin Murphy <redacted>
---
v4: No change.
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 72056afdb0d7..98e64414ea6c 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c@@ -263,6 +263,9 @@ #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
@@ -1070,7 +1073,9 @@ 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
--
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