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    Subject[PATCH V9 2/9] iommu/io-pgtable-arm: add support for the IOMMU_PRIV flag
    Date
    From: Jeremy Gebben <jgebben@codeaurora.org>

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

    Reviewed-by: Robin Murphy <robin.murphy@arm.com>
    Tested-by: Robin Murphy <robin.murphy@arm.com>
    Acked-by: Will Deacon <will.deacon@arm.com>
    Signed-off-by: Jeremy Gebben <jgebben@codeaurora.org>
    ---
    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);
    --
    QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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