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[34.83.136.168]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82c7d388e5esm6639001b3a.37.2026.03.27.11.40.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Mar 2026 11:40:14 -0700 (PDT) Date: Fri, 27 Mar 2026 18:40:10 +0000 From: Samiullah Khawaja To: Pranjal Shrivastava Cc: David Woodhouse , Lu Baolu , Joerg Roedel , Will Deacon , Jason Gunthorpe , Robin Murphy , Kevin Tian , Alex Williamson , Shuah Khan , iommu@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Saeed Mahameed , Adithya Jayachandran , Parav Pandit , Leon Romanovsky , William Tu , Pratyush Yadav , Pasha Tatashin , David Matlack , Andrew Morton , Chris Li , Vipin Sharma , YiFei Zhu Subject: Re: [PATCH 14/14] iommufd/selftest: Add test to verify iommufd preservation Message-ID: References: <20260203220948.2176157-1-skhawaja@google.com> <20260203220948.2176157-15-skhawaja@google.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; format=flowed Content-Disposition: inline In-Reply-To: On Fri, Mar 27, 2026 at 06:25:36PM +0000, Samiullah Khawaja wrote: >On Wed, Mar 25, 2026 at 09:05:32PM +0000, Pranjal Shrivastava wrote: >>On Tue, Feb 03, 2026 at 10:09:48PM +0000, Samiullah Khawaja wrote: >>>Test iommufd preservation by setting up an iommufd and vfio cdev and >>>preserve it across live update. Test takes VFIO cdev path of a device >>>bound to vfio-pci driver and binds it to an iommufd being preserved. It >>>also preserves the vfio cdev so the iommufd state associated with it is >>>also preserved. >>> >>>The restore path is tested by restoring the preserved vfio cdev only. >>>Test tries to finish the session without restoring iommufd and confirms >>>that it fails. >>> >>>Signed-off-by: Samiullah Khawaja >>>Signed-off-by: YiFei Zhu >>>--- >>> tools/testing/selftests/iommu/Makefile | 12 + >>> .../selftests/iommu/iommufd_liveupdate.c | 209 ++++++++++++++++++ >>> 2 files changed, 221 insertions(+) >>> create mode 100644 tools/testing/selftests/iommu/iommufd_liveupdate.c >>> >>>+int main(int argc, char *argv[]) >> >>The iommufd selftest directory heavily utilizes the standard kselftest >>harness (TEST_F, EXPECT_EQ, ASSERT_EQ), by writing a raw main(), this >>patch circumvents the standard test reporting structure (like returning 1 >>on argc < 2 instead of ksft_exit_skip(), and returning 0 at the end >>instead of ksft_exit_pass() etc.). We should rewrite this cleanly >>following the existing iommufd test infrastructure using TEST_F blocks. > >Agreed. Will do. Thinking about this more, these liveupdate tests are two stage tests. There is a run before liveupdate and there is a run after liveupdate. I will have to use the luo_test mechanism here for this test. See example usage in the kexec_test in the VFIO cdev preservation series: https://lore.kernel.org/all/20260323235817.1960573-21-dmatlack@google.com >> >>>+{ >>>+ int iommufd, cdev_fd, memfd, luo, session, ret; >>>+ const int token = 0x123456; >>>+ const int cdev_token = 0x654321; >>>+ const int hwpt_token = 0x789012; >>>+ const int memfd_token = 0x890123; >> >>Shouldn't these be u64? Defining them as signed int-s undermines that >>contract? > >Agreed. Will update. >> >>>+ >>>+ if (argc < 2) { >>>+ printf("Usage: ./iommufd_liveupdate \n"); >>>+ return 1; >>>+ } >>>+ >>>+ luo = luo_open_device(); >>>+ ksft_assert(luo > 0); >>>+ >>>+ session = luo_retrieve_session(luo, "iommufd-test"); >> >>[ ---- >8 ---- ] >> >>Thanks, >>Praan > >Thanks, >Sami