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    Subject[PATCH 2/4] iommu/vt-d: Implement apply_resv_region for reserving IOVA ranges
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    Date
    Used by iommu.c before creating identity mappings for reserved ranges to
    ensure dma-map-ops won't ever remap these addresses.

    Signed-off-by: James Sewart <jamessewart@arista.com>
    ---
    drivers/iommu/intel-iommu.c | 14 ++++++++++++++
    1 file changed, 14 insertions(+)

    diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
    index 78188bf7e90d..8e0a4e2ff77f 100644
    --- a/drivers/iommu/intel-iommu.c
    +++ b/drivers/iommu/intel-iommu.c
    @@ -5299,6 +5299,19 @@ static void intel_iommu_put_resv_regions(struct device *dev,
    }
    }

    +static void intel_iommu_apply_resv_region(struct device *dev,
    + struct iommu_domain *domain,
    + struct iommu_resv_region *region)
    +{
    + struct dmar_domain *dmar_domain = to_dmar_domain(domain);
    + unsigned long start, end;
    +
    + start = IOVA_PFN(region->start);
    + end = IOVA_PFN(region->start + region->length - 1);
    +
    + WARN_ON_ONCE(reserve_iova(&dmar_domain->iovad, start, end) == NULL);
    +}
    +
    #ifdef CONFIG_INTEL_IOMMU_SVM
    int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sdev)
    {
    @@ -5392,6 +5405,7 @@ const struct iommu_ops intel_iommu_ops = {
    .remove_device = intel_iommu_remove_device,
    .get_resv_regions = intel_iommu_get_resv_regions,
    .put_resv_regions = intel_iommu_put_resv_regions,
    + .apply_resv_region = intel_iommu_apply_resv_region,
    .device_group = pci_device_group,
    .pgsize_bitmap = INTEL_IOMMU_PGSIZES,
    };
    --
    2.17.1
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