linux-kernel - Re: [PATCH 02/21] PCI: Add API to track PCI devices preserved across Live Update

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Message-ID: <20251202145925.GC1075897@nvidia.com>
Date: Tue, 2 Dec 2025 10:59:25 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Lukas Wunner <lukas@...ner.de>
Cc: David Matlack <dmatlack@...gle.com>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	Alex Williamson <alex@...zbot.org>,
	Adithya Jayachandran <ajayachandra@...dia.com>,
	Alex Mastro <amastro@...com>, Alistair Popple <apopple@...dia.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, Chris Li <chrisl@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Jacob Pan <jacob.pan@...ux.microsoft.com>,
	Josh Hilke <jrhilke@...gle.com>, Kevin Tian <kevin.tian@...el.com>,
	kvm@...r.kernel.org, Leon Romanovsky <leonro@...dia.com>,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	linux-pci@...r.kernel.org, Mike Rapoport <rppt@...nel.org>,
	Parav Pandit <parav@...dia.com>,
	Philipp Stanner <pstanner@...hat.com>,
	Pratyush Yadav <pratyush@...nel.org>,
	Saeed Mahameed <saeedm@...dia.com>,
	Samiullah Khawaja <skhawaja@...gle.com>,
	Shuah Khan <shuah@...nel.org>, Tomita Moeko <tomitamoeko@...il.com>,
	Vipin Sharma <vipinsh@...gle.com>, William Tu <witu@...dia.com>,
	Yi Liu <yi.l.liu@...el.com>, Yunxiang Li <Yunxiang.Li@....com>,
	Zhu Yanjun <yanjun.zhu@...ux.dev>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH 02/21] PCI: Add API to track PCI devices preserved across
 Live Update

On Tue, Dec 02, 2025 at 07:20:23AM +0100, Lukas Wunner wrote:

> But you do gain a bit of reliability if you don't assume bus numbers
> to stay the same and instead use the "path from root" approach to
> identify devices.

Again, that's not reliability it is subtle bugs. The device is active
during KHO, you CAN NOT do any resource reassignment, not bus numbers,
not mmio. It must be fully disabled.

Jason