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[34.168.217.79]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2a71941c088sm29731605ad.91.2026.01.16.14.33.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 16 Jan 2026 14:33:42 -0800 (PST) Date: Fri, 16 Jan 2026 22:33:38 +0000 From: David Matlack To: Alex Mastro Cc: Alex Williamson , Shuah Khan , Peter Xu , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, Jason Gunthorpe Subject: Re: [PATCH v3 0/3] vfio: selftests: Add MMIO DMA mapping test Message-ID: References: <20260114-map-mmio-test-v3-0-44e036d95e64@fb.com> Precedence: bulk X-Mailing-List: linux-kernel@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: <20260114-map-mmio-test-v3-0-44e036d95e64@fb.com> On 2026-01-14 10:57 AM, Alex Mastro wrote: > Test IOMMU mapping the BAR mmaps created during vfio_pci_device_setup(). > > All IOMMU modes are tested: vfio_type1 variants are expected to succeed, > while non-type1 modes are expected to fail. iommufd compat mode can be > updated to expect success once kernel support lands. Native iommufd will > not support mapping vaddrs backed by MMIO (it will support dma-buf based > MMIO mapping instead). > > Changes in v3: > - Rename mmap_aligned() to mmap_reserve() > - Reorder variable declarations for reverse-fir-tree style > - Update patch 2 commit message to mention MADV_HUGEPAGE and MAP_FILE > - Move BAR size check into map_partial_bar test only > - Link to v2: https://lore.kernel.org/r/20260113-map-mmio-test-v2-0-e6d34f09c0bb@fb.com > > Changes in v2: > - Split into patch series > - Factor out mmap_reserve() for vaddr alignment > - Align BAR mmaps to improve hugepage IOMMU mapping efficiency > - Centralize MODE_* string definitions > - Add is_power_of_2() assertion for BAR size > - Simplify align calculation to min(size, 1G) > - Add map_bar_misaligned test case > - Link to v1: https://lore.kernel.org/all/20260107-scratch-amastro-vfio-dma-mapping-mmio-test-v1-1-0cec5e9ec89b@fb.com > > Signed-off-by: Alex Mastro Reviewed-by: David Matlack Tested-by: David Matlack