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Subject: [PATCH v2 2/7] iommu/vt-d: Implement apply_resv_region for reserving
 IOVA ranges
From:   James Sewart <jamessewart@arista.com>
In-Reply-To: <83B82113-8AE5-4B0C-A079-F389520525BD@arista.com>
Date:   Thu, 14 Mar 2019 11:58:03 +0000
Cc:     Tom Murphy <tmurphy@arista.com>, Dmitry Safonov <dima@arista.com>,
        Jacob Pan <jacob.jun.pan@linux.intel.com>,
        linux-kernel@vger.kernel.org, Lu Baolu <baolu.lu@linux.intel.com>
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 <83B82113-8AE5-4B0C-A079-F389520525BD@arista.com>
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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 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,
 	}
 }
=20
+static void intel_iommu_apply_resv_region(struct device *dev,
+		struct iommu_domain *domain,
+		struct iommu_resv_region *region)
+{
+	struct dmar_domain *dmar_domain =3D to_dmar_domain(domain);
+	unsigned long start, end;
+
+	start =3D IOVA_PFN(region->start);
+	end   =3D IOVA_PFN(region->start + region->length - 1);
+
+	WARN_ON_ONCE(reserve_iova(&dmar_domain->iovad, start, end) =3D=3D =
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 =3D {
 	.remove_device		=3D intel_iommu_remove_device,
 	.get_resv_regions	=3D intel_iommu_get_resv_regions,
 	.put_resv_regions	=3D intel_iommu_put_resv_regions,
+	.apply_resv_region	=3D intel_iommu_apply_resv_region,
 	.device_group		=3D pci_device_group,
 	.pgsize_bitmap		=3D INTEL_IOMMU_PGSIZES,
 };
--=20
2.17.1