[RFC PATCH 2/6] selftests/vfio: add sPAPR TCE v2 IOMMU mode

[Narayana Murty N <nnmlinux@linux.ibm.com>]

Add a PowerPC-specific VFIO selftest IOMMU mode for sPAPR TCE v2.

The new mode uses the legacy VFIO container interface with
VFIO_SPAPR_TCE_v2_IOMMU. It does not use iommufd or VFIO cdev.

On PowerPC, generate the sPAPR TCE v2 fixture variant so the tests exercise
the backend that is valid for this platform.

Signed-off-by: Narayana Murty N <nnmlinux@linux.ibm.com>
---
 tools/testing/selftests/vfio/lib/include/libvfio/iommu.h | 8 ++++++++
 tools/testing/selftests/vfio/lib/iommu.c                 | 7 +++++++
 2 files changed, 15 insertions(+)

diff --git a/tools/testing/selftests/vfio/lib/include/libvfio/iommu.h b/tools/testing/selftests/vfio/lib/include/libvfio/iommu.h
index e9a3386a4719..ba027a7270d0 100644
--- a/tools/testing/selftests/vfio/lib/include/libvfio/iommu.h
+++ b/tools/testing/selftests/vfio/lib/include/libvfio/iommu.h
@@ -66,17 +66,25 @@ struct iommu_iova_range *iommu_iova_ranges(struct iommu *iommu, u32 *nranges);
 #define MODE_IOMMUFD_COMPAT_TYPE1 "iommufd_compat_type1"
 #define MODE_IOMMUFD_COMPAT_TYPE1V2 "iommufd_compat_type1v2"
 #define MODE_IOMMUFD "iommufd"
+#ifdef __powerpc__
+#define MODE_VFIO_SPAPR_TCE_V2_IOMMU "vfio_spapr_tce_v2_iommu"
+#endif
 
 /*
  * Generator for VFIO selftests fixture variants that replicate across all
  * possible IOMMU modes. Tests must define FIXTURE_VARIANT_ADD_IOMMU_MODE()
  * which should then use FIXTURE_VARIANT_ADD() to create the variant.
  */
+#ifdef __powerpc__
+#define FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES(...) \
+FIXTURE_VARIANT_ADD_IOMMU_MODE(vfio_spapr_tce_v2_iommu, ##__VA_ARGS__)
+#else
 #define FIXTURE_VARIANT_ADD_ALL_IOMMU_MODES(...) \
 FIXTURE_VARIANT_ADD_IOMMU_MODE(vfio_type1_iommu, ##__VA_ARGS__); \
 FIXTURE_VARIANT_ADD_IOMMU_MODE(vfio_type1v2_iommu, ##__VA_ARGS__); \
 FIXTURE_VARIANT_ADD_IOMMU_MODE(iommufd_compat_type1, ##__VA_ARGS__); \
 FIXTURE_VARIANT_ADD_IOMMU_MODE(iommufd_compat_type1v2, ##__VA_ARGS__); \
 FIXTURE_VARIANT_ADD_IOMMU_MODE(iommufd, ##__VA_ARGS__)
+#endif
 
 #endif /* SELFTESTS_VFIO_LIB_INCLUDE_LIBVFIO_IOMMU_H */
diff --git a/tools/testing/selftests/vfio/lib/iommu.c b/tools/testing/selftests/vfio/lib/iommu.c
index 035dac069d60..e86457a715bf 100644
--- a/tools/testing/selftests/vfio/lib/iommu.c
+++ b/tools/testing/selftests/vfio/lib/iommu.c
@@ -47,6 +47,13 @@ static const struct iommu_mode iommu_modes[] = {
 	{
 		.name = MODE_IOMMUFD,
 	},
+#ifdef __powerpc__
+	{
+		.name = MODE_VFIO_SPAPR_TCE_V2_IOMMU,
+		.container_path = "/dev/vfio/vfio",
+		.iommu_type = VFIO_SPAPR_TCE_v2_IOMMU,
+	},
+#endif
 };
 
 static const struct iommu_mode *lookup_iommu_mode(const char *iommu_mode)
-- 
2.51.1