iommu/vt-d: Implement apply_resv_region iommu ops entry

Used by iommu.c before creating identity mappings for reserved
ranges to ensure dma-ops won't ever remap these ranges.

Signed-off-by: James Sewart <jamessewart@arista.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 9722c2ffe42865b1c16df0b60c5aff8c613e33c0..3995afc59c28c48f6cacb91d1e5c754db93b188e 100644 (file)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5549,6 +5549,19 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev)
        return ret;
 }
 
+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));
+}
+
 #ifdef CONFIG_INTEL_IOMMU_SVM
 struct intel_iommu *intel_svm_device_to_iommu(struct device *dev)
 {
@@ -5714,6 +5727,7 @@ 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,
        .dev_has_feat           = intel_iommu_dev_has_feat,
        .dev_feat_enabled       = intel_iommu_dev_feat_enabled,