[PATCH V8 2/9] iommu/io-pgtable-arm: add support for the IOMMU_PRIV flag

From: Sricharan R
Date: Mon Jan 02 2017 - 08:13:18 EST


From: Jeremy Gebben <jgebben@xxxxxxxxxxxxxx>

Allow the creation of privileged mode mappings, for stage 1 only.

Reviewed-by: Robin Murphy <robin.murphy@xxxxxxx>
Tested-by: Robin Murphy <robin.murphy@xxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Jeremy Gebben <jgebben@xxxxxxxxxxxxxx>
---
drivers/iommu/io-pgtable-arm.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
index a40ce34..feacc54 100644
--- a/drivers/iommu/io-pgtable-arm.c
+++ b/drivers/iommu/io-pgtable-arm.c
@@ -350,11 +350,14 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,

if (data->iop.fmt == ARM_64_LPAE_S1 ||
data->iop.fmt == ARM_32_LPAE_S1) {
- pte = ARM_LPAE_PTE_AP_UNPRIV | ARM_LPAE_PTE_nG;
+ pte = ARM_LPAE_PTE_nG;

if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
pte |= ARM_LPAE_PTE_AP_RDONLY;

+ if (!(prot & IOMMU_PRIV))
+ pte |= ARM_LPAE_PTE_AP_UNPRIV;
+
if (prot & IOMMU_MMIO)
pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV
<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
--
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