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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763994093; bh=8J349+aqYU/8MBNS87ks0zT1OFB1tcYyBFGPMvm8Xjo=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=KM8+cPAktUopUOxkR02UWCqLycl011KWke1x0XedfVZAK1Mh8Hku572UAnEKLEEts GNF3d7mEFWDSG3b/00eRzormizV3GDXiaEG2zWpYaQrlq6yhfuK/dHJ96EtLq0nTBh xYWTgLkMi/Lgth3dTS72A1BJO9hDEyoIvpR2rFZiqQDuUyl5LaIBfy+ILj6p4INLRl CU6OT8lx+RanesPhsYtm64JkkjU6LAGXQLUb95D5ChSRBnX95AinNsQ3zUMcsyS3Nv a1EdbI30rD7x7xmYn9H1ut+8bOqDqCPTQTmlbteX9u3AcHaiFqXyvIm7FhjFReiHVI uBuRKSoRIDv+g== 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 02/22] liveupdate: luo_core: integrate with KHO In-Reply-To: <20251122222351.1059049-3-pasha.tatashin@soleen.com> (Pasha Tatashin's message of "Sat, 22 Nov 2025 17:23:29 -0500") References: <20251122222351.1059049-1-pasha.tatashin@soleen.com> <20251122222351.1059049-3-pasha.tatashin@soleen.com> Date: Mon, 24 Nov 2025 15:21:23 +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: rspam11 X-Rspamd-Queue-Id: 96F4140017 X-Stat-Signature: 53brejyhs9cmgajk1bim151azjm63fgg X-HE-Tag: 1763994094-822623 X-HE-Meta: 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 1mNVSuW5 /wJK+2ORxJqj4ctRXn1OpdI1I/IwP2TLLGEqPiH9nBfw5lJ/51XWKumd1V/aBW3VbTk1pYDdzoulYRfFX5POvW2RC4MwefUjAmRxr2Ay02CKDzd6IetpSViYZxSE2eWkdPIBZmPogDR5PF9wmWMuUr82YqADR9qJ4NHoDWD5UKOzbzxP5LBFILKrkrry2EEbzdjzQAn4ixilRE3lOUjP4INrwr4bbX7rGRxj8onINqCenYlSWKZTI9bh1o/w/kSlXVnXZAvHcAVEQpv5OiDfd30Pc1/69yKxC6+ayIHC8RXutkhWQhyieAGg8UA== 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: > Integrate the LUO with the KHO framework to enable passing LUO state > across a kexec reboot. > > This patch implements the lifecycle integration with KHO: > > 1. Incoming State: During early boot (`early_initcall`), LUO checks if > KHO is active. If so, it retrieves the "LUO" subtree, verifies the > "luo-v1" compatibility string, and reads the `liveupdate-number` to > track the update count. > > 2. Outgoing State: During late initialization (`late_initcall`), LUO > allocates a new FDT for the next kernel, populates it with the basic > header (compatible string and incremented update number), and > registers it with KHO (`kho_add_subtree`). > > 3. Finalization: The `liveupdate_reboot()` notifier is updated to invoke > `kho_finalize()`. This ensures that all memory segments marked for > preservation are properly serialized before the kexec jump. > > LUO now depends on `CONFIG_KEXEC_HANDOVER`. Nit: This patch does not add the dependency. That is done by patch 1. I guess that change needs to be moved here or the comment removed? Other than this, Reviewed-by: Pratyush Yadav [...] -- Regards, Pratyush Yadav