From: Jason Gunthorpe <jgg@nvidia.com>
To: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Mike Rapoport <rppt@kernel.org>,
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Subject: Re: [PATCH v6 02/20] liveupdate: luo_core: integrate with KHO
Date: Tue, 18 Nov 2025 19:25:17 -0400 [thread overview]
Message-ID: <20251118232517.GD120075@nvidia.com> (raw)
In-Reply-To: <CA+CK2bCguutAdsXETdDSEPCPT_=OQupgyTfGKQuxi924mOfhTQ@mail.gmail.com>
On Tue, Nov 18, 2025 at 05:07:15PM -0500, Pasha Tatashin wrote:
> In this case, we cannot even rely on having "safe" memory, i.e. this
> scratch only boot to preserve dmesg/core etc, this is unfortunate. Is
> there a way to avoid defaulting to identify mode when we are booting
> into the "maintenance" mode?
Maybe one could be created?
It's tricky though because you also really want to block drivers from
using the iommu if you don't know they are quieted and you can't do
that without parsing the KHO data, which you can't do because it
doesn't understand it..
IDK, I think the "maintenance" mode is something that is probably best
effort and shouldn't be relied on. It will work if the iommu data is
restored or other lucky conditions hit, so it is not useless, but it
is certainly not robust or guaranteed.
You are better to squirt a panic message out of the serial port and
hope for the best I guess.
Jason
next prev parent reply other threads:[~2025-11-18 23:25 UTC|newest]
Thread overview: 99+ 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
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 [this message]
2025-11-19 3:03 ` Pasha Tatashin
2025-11-15 23:33 ` [PATCH v6 03/20] kexec: call liveupdate_reboot() before kexec Pasha Tatashin
2025-11-16 12:44 ` Mike Rapoport
2025-11-15 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
2025-11-15 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
2025-11-15 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
2025-11-15 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
2025-11-15 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
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