[PATCH v3 2/8] iommu/vt-d: Implement apply_resv_region iommu ops entry

Lu Baolu
2019-04-29T02:09:19Z

From: James Sewart <jamessewart@arista.com>

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>
---
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 e0c0febc6fa5..af025955f1bc 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -5568,6 +5568,19 @@ 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)
{
@@ -5733,6 +5746,7 @@ 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,
--
2.17.1