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Tue, 11 Nov 2025 12:09:39 -0500 (EST) Date: Tue, 11 Nov 2025 10:09:37 -0700 From: Alex Williamson To: Alex Mastro Cc: David Matlack , Shuah Khan , Jason Gunthorpe , , , Subject: Re: [PATCH v2 4/4] vfio: selftests: replace iova=vaddr with allocated iovas Message-ID: <20251111100937.4706a54e.alex@shazbot.org> In-Reply-To: <20251111-iova-ranges-v2-4-0fa267ff9b78@fb.com> References: <20251111-iova-ranges-v2-0-0fa267ff9b78@fb.com> <20251111-iova-ranges-v2-4-0fa267ff9b78@fb.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-Transfer-Encoding: 7bit On Tue, 11 Nov 2025 06:52:05 -0800 Alex Mastro wrote: > vfio_dma_mapping_test and vfio_pci_driver_test currently use iova=vaddr > as part of DMA mapping operations. The assumption that these IOVAs > are legal has held up on all the hardware we've tested so far, but is > not guaranteed. Make the tests more robust by using iova_allocator to > vend IOVAs, which queries legally accessible IOVAs from the underlying > IOMMUFD or VFIO container. I've reported hardware that it doesn't work on, QEMU emulates such hardware. The commit message suggests this is more of a theoretical problem. Thanks, Alex