linux-kernel - [PATCH] iommu: Limit the IOVA page range to the specified addresses

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Date:   Tue, 17 Oct 2017 16:22:01 -0500
From:   Gary R Hook <gary.hook@....com>
To:     iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, linux-kernel@...r.kernel.org
Subject: [PATCH] iommu: Limit the IOVA page range to the specified addresses

From: amd <amd@...xen2.amd.com>

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@....com>
---
 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 27eb0d6fcdc2..bb3ef33e3784 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -3271,7 +3271,7 @@ static void amd_iommu_apply_resv_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);
 }