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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763999812; bh=y63yvMXGRSUR5hsa5yj3y5bNOs9e+r2tXeZwg4ggXb8=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=t3MFTO6oJzw4eL7xPmfLcDdWjwmXfWH6/xWxMWM8CQnbFA3+M27qnQlQZEZEAFSsb bnal+s2Ox/0TWQ+7JFrfNqo34Dw0GnW4t7NbtnrXlDY0iyhvWMyxTGaMY5dlgNNCvG m+5ZOBamHjaWXtD6w3VOKIoicFlyHYBpgotrFC7Gslxa+QyKvdsO8sN+QqXK+OnRnN eTjVY7JVQnmZDKBIRT7UZrg7yiMjHJ7jIvotIB1E8raHNQsV8TDSYDToYVJVepxr+e WOjOo05vwhIEe9IZm5LQY0wvYx9GNlvSYWINRBBU+gCmdDHmxrTfdS7cjDxaucLWS/ bJEKQS66cC2Og== From: Pratyush Yadav To: Pasha Tatashin Cc: pratyush@kernel.org, jasonmiu@google.com, graf@amazon.com, rppt@kernel.org, dmatlack@google.com, rientjes@google.com, corbet@lwn.net, rdunlap@infradead.org, ilpo.jarvinen@linux.intel.com, kanie@linux.alibaba.com, ojeda@kernel.org, aliceryhl@google.com, masahiroy@kernel.org, akpm@linux-foundation.org, tj@kernel.org, yoann.congal@smile.fr, mmaurer@google.com, roman.gushchin@linux.dev, chenridong@huawei.com, axboe@kernel.dk, mark.rutland@arm.com, jannh@google.com, vincent.guittot@linaro.org, hannes@cmpxchg.org, dan.j.williams@intel.com, david@redhat.com, joel.granados@kernel.org, rostedt@goodmis.org, anna.schumaker@oracle.com, song@kernel.org, linux@weissschuh.net, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, gregkh@linuxfoundation.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, rafael@kernel.org, dakr@kernel.org, bartosz.golaszewski@linaro.org, cw00.choi@samsung.com, myungjoo.ham@samsung.com, yesanishhere@gmail.com, Jonathan.Cameron@huawei.com, quic_zijuhu@quicinc.com, aleksander.lobakin@intel.com, ira.weiny@intel.com, andriy.shevchenko@linux.intel.com, leon@kernel.org, lukas@wunner.de, bhelgaas@google.com, wagi@kernel.org, djeffery@redhat.com, stuart.w.hayes@gmail.com, lennart@poettering.net, brauner@kernel.org, linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org, saeedm@nvidia.com, ajayachandra@nvidia.com, jgg@nvidia.com, parav@nvidia.com, leonro@nvidia.com, witu@nvidia.com, hughd@google.com, skhawaja@google.com, chrisl@kernel.org Subject: Re: [PATCH v7 16/22] selftests/liveupdate: Add userspace API selftests In-Reply-To: <20251122222351.1059049-17-pasha.tatashin@soleen.com> (Pasha Tatashin's message of "Sat, 22 Nov 2025 17:23:43 -0500") References: <20251122222351.1059049-1-pasha.tatashin@soleen.com> <20251122222351.1059049-17-pasha.tatashin@soleen.com> Date: Mon, 24 Nov 2025 16:56:42 +0100 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Rspam-User: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 9E7B214000B X-Stat-Signature: tjxpo3izh3xubtf9ekb7uxntgnkkfztf X-HE-Tag: 1763999813-438442 X-HE-Meta: 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 1kPmcyqO ozEB1tMeBUKRU5Kw3E6GMIZt1bAi2eoOH803epy7uInDKudKoWxPnVQyJP7UjSWEPdGQ+qTyjn3X62yV17a3lW906GKqYapmKgguEYpXsJEqquwahwZzgr3Rkq5RctHnesy3IfmorIvt1k2hifZqssgGw+leLGUxXRhmVSXQ75gqsVM39BwPG4AXb1hoeiaqvKPiZQYJ7qfCQG0nYlQRpesNBx6CJ3zo38xLCyNSSHtQ8o/Vlg4Ml1OWa3oBxV3JYz/RXFEtF2JW44SuIJUtVfkHgJmRr1Qh5702fLM+KI5uCywRn3vIE3Wp2C1pRmMPU4IeA X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, Nov 22 2025, Pasha Tatashin wrote: > Introduce a selftest suite for LUO. These tests validate the core > userspace-facing API provided by the /dev/liveupdate device and its > associated ioctls. > > The suite covers fundamental device behavior, session management, and > the file preservation mechanism using memfd as a test case. This > provides regression testing for the LUO uAPI. > > The following functionality is verified: > > Device Access: > Basic open and close operations on /dev/liveupdate. > Enforcement of exclusive device access (verifying EBUSY on a > second open). > > Session Management: > Successful creation of sessions with unique names. > Failure to create sessions with duplicate names. > > File Preservation: > Preserving a single memfd and verifying its content remains > intact post-preservation. > Preserving multiple memfds within a single session, each with > unique data. > A complex scenario involving multiple sessions, each containing > a mix of empty and data-filled memfds. > > Note: This test suite is limited to verifying the pre-kexec > functionality of LUO (e.g., session creation, file preservation). > The post-kexec restoration of resources is not covered, as the kselftest > framework does not currently support orchestrating a reboot and > continuing execution in the new kernel. > > Signed-off-by: Pasha Tatashin Reviewed-by: Pratyush Yadav [...] -- Regards, Pratyush Yadav