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[34.145.67.111]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-236030969ebsm17399595ad.72.2025.06.06.16.05.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Jun 2025 16:05:50 -0700 (PDT) Date: Fri, 6 Jun 2025 23:05:46 +0000 From: David Matlack To: Jason Gunthorpe Cc: Alex Williamson , Shuah Khan , Paolo Bonzini , Vinod Koul , Fenghua Yu , "Masami Hiramatsu (Google)" , Adhemerval Zanella , Jiri Olsa , Andrii Nakryiko , Wei Yang , Bjorn Helgaas , Takashi Iwai , Greg Kroah-Hartman , Pierre-Louis Bossart , Andy Shevchenko , FUJITA Tomonori , WangYuli , Sean Christopherson , Andrew Jones , Claudio Imbrenda , Eric Auger , Josh Hilke , linux-kselftest@vger.kernel.org, kvm@vger.kernel.org, Kevin Tian , Vipin Sharma , Pasha Tatashin , Saeed Mahameed , Adithya Jayachandran , Parav Pandit , Leon Romanovsky , Vinicius Costa Gomes , Dave Jiang , Dan Williams Subject: Re: [RFC PATCH 07/33] vfio: selftests: Use command line to set hugepage size for DMA mapping test Message-ID: References: <20250523233018.1702151-1-dmatlack@google.com> <20250523233018.1702151-8-dmatlack@google.com> <20250526171501.GE61950@nvidia.com> <20250530172559.GQ233377@nvidia.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250530172559.GQ233377@nvidia.com> On 2025-05-30 02:25 PM, Jason Gunthorpe wrote: > On Fri, May 30, 2025 at 09:50:22AM -0700, David Matlack wrote: > > I'll explore doing this. For a single dimension this looks possible. > > But for multiple dimensions (e.g. cross product of iommu_mode and > > backing_src) I don't see a clear way to do it. But that's just after a > > cursory look. > > Explicitly list all the combinations with macros? > > Enhance the userspace tests allow code to generate the > variants? Kernel tests can do this: I got a chance to play around with generating fixture variants today and eneded up with this, which I think is pretty clean. tools/testing/selftests/vfio/lib/include/vfio_util.h: #define ALL_IOMMU_MODES_VARIANT_ADD(...) \ __IOMMU_MODE_VARIANT_ADD(vfio_type1_iommu, ##__VA_ARGS__); \ __IOMMU_MODE_VARIANT_ADD(vfio_type1v2_iommu, ##__VA_ARGS__); \ __IOMMU_MODE_VARIANT_ADD(iommufd_compat_type1, ##__VA_ARGS__); \ __IOMMU_MODE_VARIANT_ADD(iommufd_compat_type1v2, ##__VA_ARGS__); \ __IOMMU_MODE_VARIANT_ADD(iommufd, ##__VA_ARGS__) tools/testing/selftests/vfio/vfio_dma_mapping_test.c: #define __IOMMU_MODE_VARIANT_ADD(_iommu_mode, _name, _size, _mmap_flags) \ FIXTURE_VARIANT_ADD(vfio_dma_mapping_test, _iommu_mode ## _name) \ { \ .iommu_mode = #_iommu_mode, \ .size = (_size), \ .mmap_flags = MAP_ANONYMOUS | MAP_PRIVATE | (_mmap_flags), \ } ALL_IOMMU_MODES_VARIANT_ADD(anonymous, 0, 0); ALL_IOMMU_MODES_VARIANT_ADD(anonymous_hugetlb_2mb, SZ_2M, MAP_HUGETLB | MAP_HUGE_2MB); ALL_IOMMU_MODES_VARIANT_ADD(anonymous_hugetlb_1gb, SZ_1G, MAP_HUGETLB | MAP_HUGE_1GB); #undef __IOMMU_MODE_VARIANT_ADD Let me know if you think this looks reasonable.