From: David Matlack <dmatlack@google.com>
To: Alex Williamson <alex@shazbot.org>
Cc: Adithya Jayachandran <ajayachandra@nvidia.com>,
Alex Mastro <amastro@fb.com>,
Alistair Popple <apopple@nvidia.com>,
Andrew Morton <akpm@linux-foundation.org>,
Bjorn Helgaas <bhelgaas@google.com>, Chris Li <chrisl@kernel.org>,
David Rientjes <rientjes@google.com>,
Jacob Pan <jacob.pan@linux.microsoft.com>,
Jason Gunthorpe <jgg@nvidia.com>, Jason Gunthorpe <jgg@ziepe.ca>,
Josh Hilke <jrhilke@google.com>,
Kevin Tian <kevin.tian@intel.com>,
kvm@vger.kernel.org, Leon Romanovsky <leonro@nvidia.com>,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-pci@vger.kernel.org, Lukas Wunner <lukas@wunner.de>,
Mike Rapoport <rppt@kernel.org>, Parav Pandit <parav@nvidia.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Philipp Stanner <pstanner@redhat.com>,
Pratyush Yadav <pratyush@kernel.org>,
Saeed Mahameed <saeedm@nvidia.com>,
Samiullah Khawaja <skhawaja@google.com>,
Shuah Khan <shuah@kernel.org>,
Tomita Moeko <tomitamoeko@gmail.com>,
Vipin Sharma <vipinsh@google.com>, William Tu <witu@nvidia.com>,
Yi Liu <yi.l.liu@intel.com>, Yunxiang Li <Yunxiang.Li@amd.com>,
Zhu Yanjun <yanjun.zhu@linux.dev>
Subject: Re: [PATCH 03/21] PCI: Require driver_override for incoming Live Update preserved devices
Date: Tue, 2 Dec 2025 21:16:02 +0000 [thread overview]
Message-ID: <aS9XEm96ifPd_ier@google.com> (raw)
In-Reply-To: <20251126193608.2678510-4-dmatlack@google.com>
On 2025-11-26 07:35 PM, David Matlack wrote:
> Require driver_override to be set to bind an incoming Live Update
> preserved device to a driver. Auto-probing could lead to the device
> being bound to a different driver than what was bound to the device
> prior to Live Update.
>
> Delegate binding preserved devices to the right driver to userspace by
> requiring driver_override to be set on the device.
>
> This restriction is relaxed once a driver calls
> pci_liveupdate_incoming_finish().
>
> Signed-off-by: David Matlack <dmatlack@google.com>
After some offline discussion with Jason and Pasha, I will drop this
patch from the next version to avoid hard-coding a policy in the kernel.
Instead, for the time being, it will be the user's responsibility to
only preserve devices that do not have any built-in drivers that will
bind to the device during boot following a Live Update.
next prev parent reply other threads:[~2025-12-02 21:16 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-26 19:35 [PATCH 00/21] vfio/pci: Base support to preserve a VFIO device file across Live Update David Matlack
2025-11-26 19:35 ` [PATCH 01/21] liveupdate: luo_flb: Prevent retrieve() after finish() David Matlack
2025-11-26 19:35 ` [PATCH 02/21] PCI: Add API to track PCI devices preserved across Live Update David Matlack
2025-11-29 10:34 ` Lukas Wunner
2025-11-29 20:10 ` Pasha Tatashin
2025-11-30 0:51 ` Jason Gunthorpe
2025-11-30 1:20 ` Pasha Tatashin
2025-12-01 13:29 ` Jason Gunthorpe
2025-12-01 18:54 ` David Matlack
2025-12-02 6:20 ` Lukas Wunner
2025-12-02 14:59 ` Jason Gunthorpe
2025-12-02 16:36 ` Chris Li
2025-12-02 18:19 ` Jason Gunthorpe
2025-12-02 21:20 ` Chris Li
2025-12-03 5:44 ` Lukas Wunner
2025-12-01 21:23 ` Pasha Tatashin
2025-11-29 20:15 ` Pasha Tatashin
2025-12-01 18:07 ` David Matlack
2025-11-26 19:35 ` [PATCH 03/21] PCI: Require driver_override for incoming Live Update preserved devices David Matlack
2025-12-02 21:16 ` David Matlack [this message]
2025-12-02 21:24 ` Chris Li
2025-11-26 19:35 ` [PATCH 04/21] vfio/pci: Register a file handler with Live Update Orchestrator David Matlack
2025-11-26 19:35 ` [PATCH 05/21] vfio/pci: Preserve vfio-pci device files across Live Update David Matlack
2025-11-26 19:35 ` [PATCH 06/21] vfio/pci: Retrieve preserved device files after " David Matlack
2025-12-03 12:55 ` Alex Mastro
2025-12-03 15:45 ` Pasha Tatashin
2025-12-03 17:29 ` David Matlack
2025-12-04 10:30 ` Alex Mastro
2025-11-26 19:35 ` [PATCH 07/21] vfio/pci: Notify PCI subsystem about devices preserved across " David Matlack
2025-11-26 19:35 ` [PATCH 08/21] vfio: Enforce preserved devices are retrieved via LIVEUPDATE_SESSION_RETRIEVE_FD David Matlack
2025-11-26 19:35 ` [PATCH 09/21] vfio/pci: Store Live Update state in struct vfio_pci_core_device David Matlack
2025-11-26 19:35 ` [PATCH 10/21] vfio/pci: Skip reset of preserved device after Live Update David Matlack
2025-11-26 19:35 ` [PATCH 11/21] selftests/liveupdate: Move luo_test_utils.* into a reusable library David Matlack
2025-11-26 19:35 ` [PATCH 12/21] selftests/liveupdate: Add helpers to preserve/retrieve FDs David Matlack
2025-11-26 19:36 ` [PATCH 13/21] vfio: selftests: Build liveupdate library in VFIO selftests David Matlack
2025-11-26 19:36 ` [PATCH 14/21] vfio: selftests: Add Makefile support for TEST_GEN_PROGS_EXTENDED David Matlack
2025-11-26 19:36 ` [PATCH 15/21] vfio: selftests: Add vfio_pci_liveupdate_uapi_test David Matlack
2025-11-26 19:36 ` [PATCH 16/21] vfio: selftests: Initialize vfio_pci_device using a VFIO cdev FD David Matlack
2025-11-26 19:36 ` [PATCH 17/21] vfio: selftests: Add vfio_pci_liveupdate_kexec_test David Matlack
2025-11-26 19:36 ` [PATCH 18/21] vfio: selftests: Expose iommu_modes to tests David Matlack
2025-11-26 19:36 ` [PATCH 19/21] vfio: selftests: Expose low-level helper routines for setting up struct vfio_pci_device David Matlack
2025-12-28 4:03 ` Zhu Yanjun
2026-01-05 17:54 ` David Matlack
2026-01-06 0:07 ` Yanjun.Zhu
2026-01-06 0:19 ` David Matlack
2025-11-26 19:36 ` [PATCH 20/21] vfio: selftests: Verify that opening VFIO device fails during Live Update David Matlack
2025-11-26 19:36 ` [PATCH 21/21] vfio: selftests: Add continuous DMA to vfio_pci_liveupdate_kexec_test David Matlack
2025-11-28 4:56 ` [PATCH 00/21] vfio/pci: Base support to preserve a VFIO device file across Live Update Zhu Yanjun
2025-12-01 15:49 ` Zhu Yanjun
2025-12-01 17:10 ` David Matlack
2025-12-01 17:16 ` Zhu Yanjun
2025-12-01 17:32 ` David Matlack
2025-12-01 17:36 ` David Matlack
2025-12-01 17:44 ` Pasha Tatashin
2025-12-01 21:45 ` Yanjun.Zhu
2025-12-01 21:48 ` David Matlack
2025-12-01 21:56 ` Yanjun.Zhu
2025-12-02 5:50 ` Zhu Yanjun
2025-12-01 21:59 ` Pasha Tatashin
2025-12-02 14:10 ` Pratyush Yadav
2025-12-02 21:29 ` David Matlack
2025-12-02 21:41 ` Pasha Tatashin
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