linux-kernel - [PATCH 18/21] vfio: selftests: Expose iommu

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Message-ID: <20251126193608.2678510-19-dmatlack@google.com>
Date: Wed, 26 Nov 2025 19:36:05 +0000
From: David Matlack <dmatlack@...gle.com>
To: Alex Williamson <alex@...zbot.org>
Cc: Adithya Jayachandran <ajayachandra@...dia.com>, Alex Mastro <amastro@...com>, 
	Alistair Popple <apopple@...dia.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Chris Li <chrisl@...nel.org>, 
	David Matlack <dmatlack@...gle.com>, David Rientjes <rientjes@...gle.com>, 
	Jacob Pan <jacob.pan@...ux.microsoft.com>, Jason Gunthorpe <jgg@...dia.com>, 
	Jason Gunthorpe <jgg@...pe.ca>, Josh Hilke <jrhilke@...gle.com>, Kevin Tian <kevin.tian@...el.com>, 
	kvm@...r.kernel.org, Leon Romanovsky <leonro@...dia.com>, linux-kernel@...r.kernel.org, 
	linux-kselftest@...r.kernel.org, linux-pci@...r.kernel.org, 
	Lukas Wunner <lukas@...ner.de>, Mike Rapoport <rppt@...nel.org>, Parav Pandit <parav@...dia.com>, 
	Pasha Tatashin <pasha.tatashin@...een.com>, Philipp Stanner <pstanner@...hat.com>, 
	Pratyush Yadav <pratyush@...nel.org>, Saeed Mahameed <saeedm@...dia.com>, 
	Samiullah Khawaja <skhawaja@...gle.com>, Shuah Khan <shuah@...nel.org>, 
	Tomita Moeko <tomitamoeko@...il.com>, Vipin Sharma <vipinsh@...gle.com>, William Tu <witu@...dia.com>, 
	Yi Liu <yi.l.liu@...el.com>, Yunxiang Li <Yunxiang.Li@....com>, 
	Zhu Yanjun <yanjun.zhu@...ux.dev>
Subject: [PATCH 18/21] vfio: selftests: Expose iommu_modes to tests

Expose the list of iommu_modes to enable tests that want to iterate
through all possible iommu modes.

Signed-off-by: David Matlack <dmatlack@...gle.com>
---
 tools/testing/selftests/vfio/lib/include/libvfio/iommu.h | 2 ++
 tools/testing/selftests/vfio/lib/iommu.c                 | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/vfio/lib/include/libvfio/iommu.h b/tools/testing/selftests/vfio/lib/include/libvfio/iommu.h
index 5c9b9dc6d993..a03ff2281f11 100644
--- a/tools/testing/selftests/vfio/lib/include/libvfio/iommu.h
+++ b/tools/testing/selftests/vfio/lib/include/libvfio/iommu.h
@@ -15,6 +15,8 @@ struct iommu_mode {
 	unsigned long iommu_type;
 };
 
+extern const struct iommu_mode iommu_modes[];
+extern const int nr_iommu_modes;
 extern const char *default_iommu_mode;
 
 struct dma_region {
diff --git a/tools/testing/selftests/vfio/lib/iommu.c b/tools/testing/selftests/vfio/lib/iommu.c
index 8079d43523f3..bf54f95ec833 100644
--- a/tools/testing/selftests/vfio/lib/iommu.c
+++ b/tools/testing/selftests/vfio/lib/iommu.c
@@ -24,7 +24,7 @@
 const char *default_iommu_mode = "iommufd";
 
 /* Reminder: Keep in sync with FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES(). */
-static const struct iommu_mode iommu_modes[] = {
+const struct iommu_mode iommu_modes[] = {
 	{
 		.name = "vfio_type1_iommu",
 		.container_path = "/dev/vfio/vfio",
@@ -50,6 +50,8 @@ static const struct iommu_mode iommu_modes[] = {
 	},
 };
 
+const int nr_iommu_modes = ARRAY_SIZE(iommu_modes);
+
 static const struct iommu_mode *lookup_iommu_mode(const char *iommu_mode)
 {
 	int i;
-- 
2.52.0.487.g5c8c507ade-goog