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

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Message-ID: <CALzav=evA12+-4mOjUMLin=E=STKSW9JCpT12poyvW=N8jh8Cg@mail.gmail.com>
Date: Mon, 1 Dec 2025 10:07:28 -0800
From: David Matlack <dmatlack@...gle.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: 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>, Jason Gunthorpe <jgg@...dia.com>, 
	Jason Gunthorpe <jgg@...pe.ca>, 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, 
	Lukas Wunner <lukas@...ner.de>, 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>
Subject: Re: [PATCH 02/21] PCI: Add API to track PCI devices preserved across
 Live Update

On Sat, Nov 29, 2025 at 12:15 PM Pasha Tatashin
<pasha.tatashin@...een.com> wrote:
>
> > +static void pci_flb_unpreserve(struct liveupdate_flb_op_args *args)
> > +{
> > +       struct pci_ser *ser = args->obj;
> > +       struct folio *folio = virt_to_folio(ser);
> > +
> > +       WARN_ON_ONCE(ser->nr_devices);
> > +       kho_unpreserve_folio(folio);
> > +       folio_put(folio);
>
> Here, and in other places in this series, I would use:
> https://lore.kernel.org/all/20251114190002.3311679-4-pasha.tatashin@soleen.com
>
> kho_alloc_preserve(size_t size)
> kho_unpreserve_free(void *mem)
> kho_restore_free(void *mem)

Will do, thanks for the suggestion.