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b=OOnm5D+NhalAr8wIMcxMKb6VaxdR7MfXZrVr6waUND5kQ2IBfnaKblstAaUWXsZHe yJ58QN3mCNgHX47Xtk9I7+p8DaT5sTD+VexFUJkz29OKusmhRsdT9Y6VngaWiB8PbT VpiDPdcqlswFHeb5OZtylVmAX7ZxuZ0XmxtgOBj5/zvvfW8SnDc8MfF2A76BSFlQle 7Z1/avFAPLYTtPBdj3MZUI7cVEn+IB1SGbyKfXlTbzHSrtPHSPgNLm2y8ENTkPGjnu HGpV8OOhAKSF7sqEjYJ48iGCXGgk7gTdlk80vG0Yi5u6Ioi8YHNuzvyVkKeq9Z3Avi OoCVbShyvHzKg== Date: Thu, 27 Aug 2026 16:47:02 -0500 From: Bjorn Helgaas To: David Matlack Cc: kexec@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, Adithya Jayachandran , Alexander Graf , Alex Williamson , Bjorn Helgaas , Chris Li , David Rientjes , Jacob Pan , Jason Gunthorpe , Jonathan Corbet , Josh Hilke , Leon Romanovsky , Lukas Wunner , Mike Rapoport , Parav Pandit , Pasha Tatashin , Pranjal Shrivastava , Pratyush Yadav , Saeed Mahameed , Samiullah Khawaja , Shuah Khan , Vipin Sharma , William Tu , Yi Liu Subject: Re: [PATCH v8 02/12] PCI: liveupdate: Track outgoing preserved PCI devices Message-ID: <20260827214702.GA1636952@bhelgaas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260728221007.2098560-3-dmatlack@google.com> X-Stat-Signature: sfjyafu8t58is67fiuhkrej3abkzqkgi X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: CBF4220002 X-Rspam-User: X-HE-Tag: 1787867225-556826 X-HE-Meta: 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 MMNbLIH7 S4xfIsstJtiby2rWn9xYQpEb5dPCVmWp1N7cqYUmkaJYga9zNk7rLOOqjTfYiQ5hcfR7f9ddt4ZBK6fAxmDPr7GY3xaGhz5ZCYMpIKFcMUfbqxwaZgQe1g8TjCW1V/ejR+gm8akhl1p633Nm/UO2FUxbpy2UZAFR4Wqjf+9CG1X+i2JiPMRFqciUWj2kagl7uE+QexunGOGo22NiOYGS8RBJsAdUwP7eZjC7U/2Z7VUX01tlM25dHywhHe5dQqnCQ5K0bg9hEWWXInElnQM77fNURokb7KMR2QsvOgg0Zx1n8nlZNIQigAmFwvNwYYsR+OIsaeEpU/2sjJ5iEQ6gWjJDCZg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Jul 28, 2026 at 10:09:56PM +0000, David Matlack wrote: > Add APIs to allow drivers to notify the PCI core of which devices are > being preserved across a Live Update for the next kernel, i.e. > "outgoing" devices. > > Drivers must notify the PCI core when devices are preserved so that the > PCI core can update its FLB data (struct pci_ser) and track the list of > outgoing devices. pci_liveupdate_preserve() notifies the PCI core that a > device must be preserved across Live Update. pci_liveupdate_unpreserve() > reverses this (cancels the preservation of the device). > > This tracking ensures the PCI core is fully aware of which devices may > need special handling during shutdown and kexec, and so the list of > preserved devices can be handed off to the next kernel. > > For now, the API only supports preserving non-VF devices on a root bus > (not behind an PCI-to-PCI bridges). s/an// > Reviewed-by: Pranjal Shrivastava > Reviewed-by: Pasha Tatashin > Reviewed-by: Bjorn Helgaas > Signed-off-by: David Matlack