linux-kernel - Re: [PATCH v2 06/10] PCI/LUO: Save and restore driver name

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Message-ID: <20250929175704.GK2695987@ziepe.ca>
Date: Mon, 29 Sep 2025 14:57:04 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Chris Li <chrisl@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>, Len Brown <lenb@...nel.org>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, David Matlack <dmatlack@...gle.com>,
	Pasha Tatashin <tatashin@...gle.com>,
	Jason Miu <jasonmiu@...gle.com>, Vipin Sharma <vipinsh@...gle.com>,
	Saeed Mahameed <saeedm@...dia.com>,
	Adithya Jayachandran <ajayachandra@...dia.com>,
	Parav Pandit <parav@...dia.com>, William Tu <witu@...dia.com>,
	Mike Rapoport <rppt@...nel.org>, Leon Romanovsky <leon@...nel.org>
Subject: Re: [PATCH v2 06/10] PCI/LUO: Save and restore driver name

On Tue, Sep 16, 2025 at 12:45:14AM -0700, Chris Li wrote:
> Save the PCI driver name into "struct pci_dev_ser" during the PCI
> prepare callback.
> 
> After kexec, use driver_set_override() to ensure the device is
> bound only to the saved driver.

This doesn't seem like a great idea, driver name should not be made
ABI.

I would drop this patch and punt to the initrd. We need a more
flexible way to manage driver auto binding for CC under initrd control
anyhow, the same should be reused for hypervisors to shift driver
binding policy to userspace.

Jason