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[142.162.112.119]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-890770e217bsm42850346d6.13.2026.01.07.16.54.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jan 2026 16:54:06 -0800 (PST) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1vdeHu-00000002Hrc-0KPf; Wed, 07 Jan 2026 20:54:06 -0400 Date: Wed, 7 Jan 2026 20:54:06 -0400 From: Jason Gunthorpe To: David Matlack Cc: Alex Mastro , Alex Williamson , Shuah Khan , Peter Xu , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH] vfio: selftests: Add vfio_dma_mapping_mmio_test Message-ID: <20260108005406.GA545276@ziepe.ca> References: <20260107-scratch-amastro-vfio-dma-mapping-mmio-test-v1-1-0cec5e9ec89b@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: On Wed, Jan 07, 2026 at 11:54:09PM +0000, David Matlack wrote: > On 2026-01-07 02:13 PM, Alex Mastro wrote: > > Test MMIO-backed DMA mappings by iommu_map()-ing mmap'ed BAR regions. > > Thanks for adding this! > > > Also update vfio_pci_bar_map() to align BAR mmaps for efficient huge > > page mappings. > > > > Only vfio_type1 variants are tested; iommufd variants can be added > > once kernel support lands. > > Are there plans to support mapping BARs via virtual address in iommufd? > I thought the plan was only to support via dma-bufs. Maybe Jason can > confirm. Only dmabuf. > Assuming not, should we add negative tests here to make sure iommufd > does not allow mapping BARs? Yes > And then we can add dma-buf tests in a future commit. Yes Jason