linux-kernel - [PATCH] vfio: selftests: Drop IOMMU mapping size assertions for VFIO_TYPE1

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20260114211252.2581145-1-dmatlack@google.com>
Date: Wed, 14 Jan 2026 21:12:52 +0000
From: David Matlack <dmatlack@...gle.com>
To: Alex Williamson <alex@...zbot.org>
Cc: David Matlack <dmatlack@...gle.com>, Jason Gunthorpe <jgg@...pe.ca>, kvm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	Shuah Khan <shuah@...nel.org>
Subject: [PATCH] vfio: selftests: Drop IOMMU mapping size assertions for VFIO_TYPE1_IOMMU

Drop the assertions about IOMMU mappings sizes for VFIO_TYPE1_IOMMU
modes (both the VFIO mode and the iommufd compatibility mode). These
assertions fail when CONFIG_IOMMUFD_VFIO_CONTAINER is enabled, since
iommufd compatibility mode provides different huge page behavior than
VFIO for VFIO_TYPE1_IOMMU. VFIO_TYPE1_IOMMU is an old enough interface
that it's not worth changing the behavior of VFIO and iommufd to match
nor care about the IOMMU mapping sizes.

Cc: Jason Gunthorpe <jgg@...pe.ca>
Link: https://lore.kernel.org/kvm/20260109143830.176dc279@shazbot.org/
Signed-off-by: David Matlack <dmatlack@...gle.com>
---
 tools/testing/selftests/vfio/vfio_dma_mapping_test.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tools/testing/selftests/vfio/vfio_dma_mapping_test.c b/tools/testing/selftests/vfio/vfio_dma_mapping_test.c
index 5397822c3dd4..ecadd0e6b61b 100644
--- a/tools/testing/selftests/vfio/vfio_dma_mapping_test.c
+++ b/tools/testing/selftests/vfio/vfio_dma_mapping_test.c
@@ -162,12 +162,8 @@ TEST_F(vfio_dma_mapping_test, dma_map_unmap)
 	if (rc == -EOPNOTSUPP)
 		goto unmap;
 
-	/*
-	 * IOMMUFD compatibility-mode does not support huge mappings when
-	 * using VFIO_TYPE1_IOMMU.
-	 */
-	if (!strcmp(variant->iommu_mode, "iommufd_compat_type1"))
-		mapping_size = SZ_4K;
+	if (self->iommu->mode->iommu_type == VFIO_TYPE1_IOMMU)
+		goto unmap;
 
 	ASSERT_EQ(0, rc);
 	printf("Found IOMMU mappings for IOVA 0x%lx:\n", region.iova);

base-commit: d721f52e31553a848e0e9947ca15a49c5674aef3
-- 
2.52.0.457.g6b5491de43-goog