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AJvYcCXCl0yXztBVqh1We7PDtmoxWVBzhYA8IiU3IEfBuYOadClQ/i5RTnbI2uM3fOQ7eqO/klEhHXNi4w==@kvack.org X-Gm-Message-State: AOJu0YwPzUO66xCOsLI/k4muQr8IVFo2S6J/BC5HG86NqLEIKJ4K6Cwf tFTyZijUZTK3uhn19XQOhwBcF45oEa42J+Hiv43srKHVn1anpyWF3A4zZMtlQB48xMRrgeTPNVg 4IrLAI025SMLnF7fOONxGl6fZ5NQiIPzriFGryR4uew== X-Gm-Gg: ASbGnctObbFvewghMGTb8UrCXSwTaQeyIUBEMkADeWtsdHPQr3VfLs2Gi69W6iDtlbU lHlJkMxRaHQJ+BAbck4R0w74ir5LJRJNyTPjgoxSQgxJ5OJhXKEhgI1xDP8qlP/noNURvMUS9GL QyGuV3cDE9hNFgpvoHDuHnZdAT/AIUiiU68XS9FBFRulwLsYRQ5kJV+Qu70G07/Tw8kzX/yhrx0 EWV7LV5IyvctFi+wHJPtEAw7Y8+/rRPTlT/3inED12OGRI5O58EbIP0YvFiWx/4Paxr X-Google-Smtp-Source: AGHT+IEAMY0pvJyme6T1x/GXi+zAz7fUHPUOcouP4DWp2W4b/iQCr9XdKr/m0KnneLDceMLTWxGdGs7cWzgaueOTCwA= X-Received: by 2002:a05:6402:2750:b0:640:f1ea:8d1b with SMTP id 4fb4d7f45d1cf-64554665a54mr9031837a12.16.1763925949554; Sun, 23 Nov 2025 11:25:49 -0800 (PST) MIME-Version: 1.0 References: <20251122222351.1059049-1-pasha.tatashin@soleen.com> <20251122222351.1059049-6-pasha.tatashin@soleen.com> In-Reply-To: From: Pasha Tatashin Date: Sun, 23 Nov 2025 14:25:13 -0500 X-Gm-Features: AWmQ_bkm6GWLaDGmSYxA_sDe-BfkSNdLO3VJvb3Ilu_NQl85-GJkxSTO8YXhl0w Message-ID: Subject: Re: [PATCH v7 05/22] liveupdate: luo_core: add user interface To: Mike Rapoport Cc: pratyush@kernel.org, jasonmiu@google.com, graf@amazon.com, 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, ptyadav@amazon.de, 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 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 40C441C0005 X-Stat-Signature: 5toxdbf48awwe1n31yadrxmkgqdo8d9d X-Rspam-User: X-HE-Tag: 1763925951-413313 X-HE-Meta: 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 /WfY2NrV qiRiVmYXV7l1DFOTjyQdcXfOnLnlzHGlkRjfisDpJUHjvnn7XwERBmqzIHQ3ZFgwHO/q5uLRgcUpWw+OtfLCTGsUbqWC4injc3Q6MaiEy4n8Q/nkuu2BkQKfyrAL+/V+7ycI8Frw4AtGnEb2/7UKGu0VzjUlSrKCqqkyQCWMfh5NL3ILTUiMYGURyyYdHqAyrQGkgdtDVSLtg27c4cWyPK+1X7hjKWflMiS6o8qZnRe0OMjnXtcGE/N4qKx5MvRk5R1vBzPp37H9OKReRQsizw7S5MuVCPp4FwQ5pT2Gkn6JYMWBUrxEqJixMY46Ei8jfMsObY53qTV5oWFVkO+V3jYIvI/wl3ABw6Uar7s9GieIpzKXwSYy4y49VxysyBPtXETHtSz6vZjNErk8= 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 Sun, Nov 23, 2025 at 9:20=E2=80=AFAM Mike Rapoport wro= te: > > On Sat, Nov 22, 2025 at 05:23:32PM -0500, Pasha Tatashin wrote: > > Introduce the user-space interface for the Live Update Orchestrator > > via ioctl commands, enabling external control over the live update > > process and management of preserved resources. > > > > The idea is that there is going to be a single userspace agent driving > > the live update, therefore, only a single process can ever hold this > > device opened at a time. > > > > The following ioctl commands are introduced: > > > > LIVEUPDATE_IOCTL_CREATE_SESSION > > Provides a way for userspace to create a named session for grouping fil= e > > descriptors that need to be preserved. It returns a new file descriptor > > representing the session. > > > > LIVEUPDATE_IOCTL_RETRIEVE_SESSION > > Allows the userspace agent in the new kernel to reclaim a preserved > > session by its name, receiving a new file descriptor to manage the > > restored resources. > > > > Signed-off-by: Pasha Tatashin > > Reviewed-by: Mike Rapoport (Microsoft) Thanks > > > --- > > include/uapi/linux/liveupdate.h | 64 +++++++++++ > > kernel/liveupdate/luo_core.c | 179 ++++++++++++++++++++++++++++++- > > kernel/liveupdate/luo_internal.h | 21 ++++ > > 3 files changed, 263 insertions(+), 1 deletion(-) > > -- > Sincerely yours, > Mike.