From: Mike Rapoport <rppt@kernel.org>
To: Pasha Tatashin <pasha.tatashin@soleen.com>
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
Subject: Re: [PATCH v6 02/20] liveupdate: luo_core: integrate with KHO
Date: Tue, 18 Nov 2025 13:21:34 +0200 [thread overview]
Message-ID: <aRxWvsdv1dQz8oZ4@kernel.org> (raw)
In-Reply-To: <CA+CK2bAEdNE0Rs1i7GdHz8Q3DK9Npozm8sRL8Epa+o50NOMY7A@mail.gmail.com>
On Mon, Nov 17, 2025 at 11:22:54PM -0500, Pasha Tatashin wrote:
> > You can avoid that complexity if you register the device with a different
> > fops, but that's technicality.
> >
> > Your point about treating the incoming FDT as an underlying resource that
> > failed to initialize makes sense, but nevertheless userspace needs a
> > reliable way to detect it and parsing dmesg is not something we should rely
> > on.
>
> I see two solutions:
>
> 1. LUO fails to retrieve the preserved data, the user gets informed by
> not finding /dev/liveupdate, and studying the dmesg for what has
> happened (in reality in fleets version mismatches should not be
> happening, those should be detected in quals).
> 2. Create a zombie device to return some errno on open, and still
> study dmesg to understand what really happened.
User should not study dmesg. We need another solution.
What's wrong with e.g. ioctl()?
> I think that 1 is better
>
> Pasha
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2025-11-18 11:22 UTC|newest]
Thread overview: 106+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-15 23:33 [PATCH v6 00/20] Live Update Orchestrator Pasha Tatashin
2025-11-15 23:33 ` [PATCH v6 01/20] liveupdate: luo_core: luo_ioctl: " Pasha Tatashin
2025-11-17 2:54 ` Andrew Morton
2025-11-17 14:27 ` Pasha Tatashin
2025-11-18 15:45 ` Pratyush Yadav
2025-11-18 16:11 ` Pasha Tatashin
2025-11-15 23:33 ` [PATCH v6 02/20] liveupdate: luo_core: integrate with KHO Pasha Tatashin
2025-11-16 12:43 ` Mike Rapoport
2025-11-16 14:55 ` Pasha Tatashin
2025-11-16 19:16 ` Mike Rapoport
2025-11-17 18:29 ` Pasha Tatashin
2025-11-17 21:05 ` Mike Rapoport
2025-11-18 4:22 ` Pasha Tatashin
2025-11-18 11:21 ` Mike Rapoport [this message]
2025-11-18 14:03 ` Jason Gunthorpe
2025-11-18 15:06 ` Mike Rapoport
2025-11-18 15:18 ` Pasha Tatashin
2025-11-18 15:36 ` Jason Gunthorpe
2025-11-18 15:46 ` Pasha Tatashin
2025-11-18 16:15 ` Jason Gunthorpe
2025-11-18 22:07 ` Pasha Tatashin
2025-11-18 23:25 ` Jason Gunthorpe
2025-11-19 3:03 ` Pasha Tatashin
2025-11-24 19:08 ` Jason Gunthorpe
2025-11-15 23:33 ` [PATCH v6 03/20] kexec: call liveupdate_reboot() before kexec Pasha Tatashin
2025-11-16 12:44 ` Mike Rapoport
2025-11-21 15:55 ` Pratyush Yadav
2025-11-15 23:33 ` [PATCH v6 04/20] liveupdate: luo_session: add sessions support Pasha Tatashin
2025-11-16 17:05 ` Mike Rapoport
2025-11-17 15:09 ` Pasha Tatashin
2025-11-17 21:11 ` Mike Rapoport
2025-11-18 4:28 ` Pasha Tatashin
2025-11-21 16:32 ` Pratyush Yadav
2025-11-21 21:30 ` Pasha Tatashin
2025-11-15 23:33 ` [PATCH v6 05/20] liveupdate: luo_ioctl: add user interface Pasha Tatashin
2025-11-16 17:15 ` Mike Rapoport
2025-11-17 14:22 ` Pasha Tatashin
2025-11-20 18:37 ` David Matlack
2025-11-20 19:22 ` Pasha Tatashin
2025-11-20 19:42 ` David Matlack
2025-11-20 20:13 ` Pasha Tatashin
2025-11-21 16:45 ` Pratyush Yadav
2025-11-15 23:33 ` [PATCH v6 06/20] liveupdate: luo_file: implement file systems callbacks Pasha Tatashin
2025-11-16 18:15 ` Mike Rapoport
2025-11-17 17:50 ` Pasha Tatashin
2025-11-20 17:20 ` Mike Rapoport
2025-11-20 20:25 ` Pasha Tatashin
2025-11-18 17:38 ` David Matlack
2025-11-18 17:43 ` Pratyush Yadav
2025-11-18 17:58 ` Pasha Tatashin
2025-11-18 18:17 ` Pratyush Yadav
2025-11-18 19:09 ` Jason Gunthorpe
2025-11-18 19:31 ` Pasha Tatashin
2025-11-21 17:24 ` Pratyush Yadav
2025-11-15 23:33 ` [PATCH v6 07/20] liveupdate: luo_session: Add ioctls for file preservation Pasha Tatashin
2025-11-16 18:25 ` Mike Rapoport
2025-11-18 2:58 ` Pasha Tatashin
2025-11-15 23:33 ` [PATCH v6 08/20] liveupdate: luo_flb: Introduce File-Lifecycle-Bound global state Pasha Tatashin
2025-11-17 9:39 ` Mike Rapoport
2025-11-18 3:54 ` Pasha Tatashin
2025-11-18 11:28 ` Mike Rapoport
2025-11-18 15:37 ` Pasha Tatashin
2025-11-20 18:50 ` Mike Rapoport
2025-11-20 19:10 ` Pasha Tatashin
2025-11-15 23:33 ` [PATCH v6 09/20] docs: add luo documentation Pasha Tatashin
2025-11-15 23:33 ` [PATCH v6 10/20] MAINTAINERS: add liveupdate entry Pasha Tatashin
2025-11-17 9:40 ` Mike Rapoport
2025-11-17 18:20 ` Pasha Tatashin
2025-11-15 23:33 ` [PATCH v6 11/20] mm: shmem: use SHMEM_F_* flags instead of VM_* flags Pasha Tatashin
2025-11-17 9:48 ` Mike Rapoport
2025-11-17 18:25 ` Pasha Tatashin
2025-11-15 23:33 ` [PATCH v6 12/20] mm: shmem: allow freezing inode mapping Pasha Tatashin
2025-11-17 10:08 ` Mike Rapoport
2025-11-18 4:13 ` Pasha Tatashin
2025-11-24 15:06 ` Pratyush Yadav
2025-11-15 23:33 ` [PATCH v6 13/20] mm: shmem: export some functions to internal.h Pasha Tatashin
2025-11-17 10:14 ` Mike Rapoport
2025-11-17 18:43 ` Pasha Tatashin
2025-11-15 23:34 ` [PATCH v6 14/20] liveupdate: luo_file: add private argument to store runtime state Pasha Tatashin
2025-11-17 10:15 ` Mike Rapoport
2025-11-17 18:45 ` Pasha Tatashin
2025-11-15 23:34 ` [PATCH v6 15/20] mm: memfd_luo: allow preserving memfd Pasha Tatashin
2025-11-17 11:03 ` Mike Rapoport
2025-11-19 21:56 ` Pasha Tatashin
2025-11-20 15:34 ` Pratyush Yadav
2025-11-15 23:34 ` [PATCH v6 16/20] docs: add documentation for memfd preservation via LUO Pasha Tatashin
2025-11-15 23:34 ` [PATCH v6 17/20] selftests/liveupdate: Add userspace API selftests Pasha Tatashin
2025-11-17 19:38 ` David Matlack
2025-11-17 20:16 ` Pasha Tatashin
2025-11-15 23:34 ` [PATCH v6 18/20] selftests/liveupdate: Add kexec-based selftest for session lifecycle Pasha Tatashin
2025-11-16 18:53 ` Zhu Yanjun
2025-11-17 18:23 ` Pasha Tatashin
2025-11-17 19:27 ` David Matlack
2025-11-17 20:08 ` David Matlack
2025-11-17 21:06 ` David Matlack
2025-11-18 1:01 ` Pasha Tatashin
2025-11-18 0:06 ` David Matlack
2025-11-18 1:08 ` Pasha Tatashin
2025-11-19 21:20 ` David Matlack
2025-11-19 22:12 ` Pasha Tatashin
2025-11-15 23:34 ` [PATCH v6 19/20] selftests/liveupdate: Add kexec test for multiple and empty sessions Pasha Tatashin
2025-11-15 23:34 ` [PATCH v6 20/20] tests/liveupdate: Add in-kernel liveupdate test Pasha Tatashin
2025-11-17 11:13 ` Mike Rapoport
2025-11-17 19:00 ` Pasha Tatashin
2025-11-18 11:30 ` Mike Rapoport
2025-11-18 18:56 ` Pasha Tatashin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aRxWvsdv1dQz8oZ4@kernel.org \
--to=rppt@kernel.org \
--cc=Jonathan.Cameron@huawei.com \
--cc=ajayachandra@nvidia.com \
--cc=akpm@linux-foundation.org \
--cc=aleksander.lobakin@intel.com \
--cc=aliceryhl@google.com \
--cc=andriy.shevchenko@linux.intel.com \
--cc=anna.schumaker@oracle.com \
--cc=axboe@kernel.dk \
--cc=bartosz.golaszewski@linaro.org \
--cc=bhelgaas@google.com \
--cc=bp@alien8.de \
--cc=brauner@kernel.org \
--cc=chenridong@huawei.com \
--cc=chrisl@kernel.org \
--cc=corbet@lwn.net \
--cc=cw00.choi@samsung.com \
--cc=dakr@kernel.org \
--cc=dan.j.williams@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=david@redhat.com \
--cc=djeffery@redhat.com \
--cc=dmatlack@google.com \
--cc=graf@amazon.com \
--cc=gregkh@linuxfoundation.org \
--cc=hannes@cmpxchg.org \
--cc=hpa@zytor.com \
--cc=hughd@google.com \
--cc=ilpo.jarvinen@linux.intel.com \
--cc=ira.weiny@intel.com \
--cc=jannh@google.com \
--cc=jasonmiu@google.com \
--cc=jgg@nvidia.com \
--cc=joel.granados@kernel.org \
--cc=kanie@linux.alibaba.com \
--cc=lennart@poettering.net \
--cc=leon@kernel.org \
--cc=leonro@nvidia.com \
--cc=linux-api@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux@weissschuh.net \
--cc=lukas@wunner.de \
--cc=mark.rutland@arm.com \
--cc=masahiroy@kernel.org \
--cc=mingo@redhat.com \
--cc=mmaurer@google.com \
--cc=myungjoo.ham@samsung.com \
--cc=ojeda@kernel.org \
--cc=parav@nvidia.com \
--cc=pasha.tatashin@soleen.com \
--cc=pratyush@kernel.org \
--cc=ptyadav@amazon.de \
--cc=quic_zijuhu@quicinc.com \
--cc=rafael@kernel.org \
--cc=rdunlap@infradead.org \
--cc=rientjes@google.com \
--cc=roman.gushchin@linux.dev \
--cc=rostedt@goodmis.org \
--cc=saeedm@nvidia.com \
--cc=skhawaja@google.com \
--cc=song@kernel.org \
--cc=stuart.w.hayes@gmail.com \
--cc=tglx@linutronix.de \
--cc=tj@kernel.org \
--cc=vincent.guittot@linaro.org \
--cc=wagi@kernel.org \
--cc=witu@nvidia.com \
--cc=x86@kernel.org \
--cc=yesanishhere@gmail.com \
--cc=yoann.congal@smile.fr \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.