[PATCH v7 1/6] iommu_pt: Fix test_pgsize_boundary() failure on narrow-OA formats

[Daniel Drake via B4 Relay]

From: Daniel Drake <dan at reactivated.net>

test_pgsize_boundary() tests boundary mapping with a hardcoded physical
address that requires 38 bits of physical address space. However, the
upcoming page table format for the Broadcom BCM2712 IOMMU only supports
37 bits of output address space.

This causes a test failure as iommu_map() rejects the large address
with -ERANGE.

Drop the high bits of the address (they are not relevant to the
boundary calculations being tested) so that it fits into 32 bits.

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>
Signed-off-by: Daniel Drake <dan at reactivated.net>
---
 drivers/iommu/generic_pt/kunit_iommu_pt.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/generic_pt/kunit_iommu_pt.h b/drivers/iommu/generic_pt/kunit_iommu_pt.h
index ece1c9b8c55d..9fc71db74234 100644
--- a/drivers/iommu/generic_pt/kunit_iommu_pt.h
+++ b/drivers/iommu/generic_pt/kunit_iommu_pt.h
@@ -403,7 +403,7 @@ static void test_pgsize_boundary(struct kunit *test)
 	    priv->smallest_pgsz != SZ_4K)
 		kunit_skip(test, "Format does not have the required range");
 
-	do_map(test, 0xfef80000, 0x208b95d000, 0xfef9ffff - 0xfef80000 + 1);
+	do_map(test, 0xfef80000, 0x8b95d000, 0xfef9ffff - 0xfef80000 + 1);
 }
 
 /* See https://lore.kernel.org/r/20250826143816.38686-1-eugkoira@amazon.com */

-- 
2.55.0