iommu/amd: Limit the IOVA page range to the specified addresses

[ 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@amd.com>
Fixes: 8d54d6c8b8f3 ('iommu/amd: Implement apply_dm_region call-back')
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 1a0b110..0c910a8 100644 (file)
--- 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);
 }