iommu/vt-d: Fix identity map bounds in si_domain_init()

[ Upstream commit 31000732d56b43765d51e08cccb68818fbc0032c ]

Intel IOMMU operates on inclusive bounds (both generally aas well as
iommu_domain_identity_map()). Meanwhile, for_each_mem_pfn_range() uses
exclusive bounds for end_pfn. This creates an off-by-one error when
switching between the two.

Fixes: c5395d5c4a82 ("intel-iommu: Clean up iommu_domain_identity_map()")
Signed-off-by: Jon Pan-Doh <pandoh@google.com>
Tested-by: Sudheer Dantuluri <dantuluris@google.com>
Suggested-by: Gary Zibrat <gzibrat@google.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20240709234913.2749386-1-pandoh@google.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index fd11a080380c844278c4c34e08582e42848e23b2..f55ec1fd7942a4378437108d305d4986fb89cfdd 100644 (file)
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2071,7 +2071,7 @@ static int __init si_domain_init(int hw)
                for_each_mem_pfn_range(i, nid, &start_pfn, &end_pfn, NULL) {
                        ret = iommu_domain_identity_map(si_domain,
                                        mm_to_dma_pfn_start(start_pfn),
-                                       mm_to_dma_pfn_end(end_pfn));
+                                       mm_to_dma_pfn_end(end_pfn-1));
                        if (ret)
                                return ret;
                }