[PATCH AUTOSEL for 4.9 108/156] iommu/amd: Limit the IOVA page range to the specified addresses

[alexander . levin]

From: Gary R Hook <gary.hook@xxxxxxx>

[ Upstream commit b92b4fb5c14257c0e7eae291ecc1f7b1962e1699 ]

The extent of pages specified when applying a reserved region should
include up to the last page of the range, but not the page following
the range.

Signed-off-by: Gary R Hook <gary.hook@xxxxxxx>
Fixes: 8d54d6c8b8f3 ('iommu/amd: Implement apply_dm_region call-back')
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
 drivers/iommu/amd_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 1a0b110f12c0..0c910a863581 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3211,7 +3211,7 @@ static void amd_iommu_apply_dm_region(struct device *dev,
 	unsigned long start, end;
 
 	start = IOVA_PFN(region->start);
-	end   = IOVA_PFN(region->start + region->length);
+	end   = IOVA_PFN(region->start + region->length - 1);
 
 	WARN_ON_ONCE(reserve_iova(&dma_dom->iovad, start, end) == NULL);
 }
-- 
2.11.0