linux-kernel - [PATCH v2 3/5] iommu/virtio: Sort reserved regions

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Date:   Tue, 23 Nov 2021 15:53:00 +0000
From:   Jean-Philippe Brucker <jean-philippe@...aro.org>
To:     joro@...tes.org, will@...nel.org, mst@...hat.com,
        jasowang@...hat.com
Cc:     virtualization@...ts.linux-foundation.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        eric.auger@...hat.com, sebastien.boeuf@...el.com,
        kevin.tian@...el.com, pasic@...ux.ibm.com,
        Jean-Philippe Brucker <jean-philippe@...aro.org>
Subject: [PATCH v2 3/5] iommu/virtio: Sort reserved regions

To ease identity mapping support, keep the list of reserved regions
sorted.

Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@...aro.org>
---
 drivers/iommu/virtio-iommu.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index ee8a7afd667b..d63ec4d11b00 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -423,7 +423,7 @@ static int viommu_add_resv_mem(struct viommu_endpoint *vdev,
 	size_t size;
 	u64 start64, end64;
 	phys_addr_t start, end;
-	struct iommu_resv_region *region = NULL;
+	struct iommu_resv_region *region = NULL, *next;
 	unsigned long prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
 
 	start = start64 = le64_to_cpu(mem->start);
@@ -454,7 +454,12 @@ static int viommu_add_resv_mem(struct viommu_endpoint *vdev,
 	if (!region)
 		return -ENOMEM;
 
-	list_add(&region->list, &vdev->resv_regions);
+	/* Keep the list sorted */
+	list_for_each_entry(next, &vdev->resv_regions, list) {
+		if (next->start > region->start)
+			break;
+	}
+	list_add_tail(&region->list, &next->list);
 	return 0;
 }
 
-- 
2.33.1