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b=QFGNDaTGW9a6kdfYz+Q7sP5WR3ZkbzEL1ZCMz/x/Se8P+hqKd3UU21B0gzVx4pqBl kykxyVYNOR7VMHGZ+ds/id+OC9sE4OJiDDrLvBJuAtwrEL/oYKUj25SReZiK63RWqV zqLGHgGm4CQzNaDmqo+Ta83Ay0qv+7jcHNQkaY/6E5JQ9nFVjxzjC2iuYoPQaq1/27 0XleZbQtLDheHJpPJP0IVRsnCI+hQSiEFIetIZfoCYJn1sRQx3kn2wlhuvPKWYM0G1 nI8/zJ/fR1QDFe6OK/JGPNIwx73t5SJiu7g/Tn0MksDCYe357ycHL/XROhv+A4Hhfc cSXQLsRyl3SJw== Date: Mon, 27 Apr 2026 16:06:58 -0500 From: Bjorn Helgaas To: David Matlack Cc: iommu@lists.linux.dev, 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 , Joerg Roedel , Jonathan Corbet , Josh Hilke , Leon Romanovsky , Lukas Wunner , Mike Rapoport , Parav Pandit , Pasha Tatashin , Pranjal Shrivastava , Pratyush Yadav , Robin Murphy , Saeed Mahameed , Samiullah Khawaja , Shuah Khan , Will Deacon , William Tu , Yi Liu Subject: Re: [PATCH v4 03/11] PCI: liveupdate: Track incoming preserved PCI devices Message-ID: <20260427210658.GA186673@bhelgaas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260423212316.3431746-4-dmatlack@google.com> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 7091440018 X-Rspam-User: X-Stat-Signature: wssq4z3crjcsrm5nb759mw7fp56bw5qf X-HE-Tag: 1777324022-368153 X-HE-Meta: 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 Dkewu6fF rYdjERqZ16OUygmF2IddaL0ybMs+DDjaVlaRqum+DG+2ocaPGxQGO8dD7nXYCKqoY9erQDNGw1Ug6XobybaJsk2mUGQd9ksYmB1HXkfeEt6ebkaC7GoqXj+YkJqLb6ecTaUwp/WtXAZSxqYbLwssfrzoIwhACd5Zbe5XbcFrwjACtqjrubdDP32lYVsnzBphmilpbxZr6dx3xPP3UOx5zB+/+yqZa+0CWZnfKz7JyAJ8b3z5lkLVVEW0xMYcxcH3ReFyF Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Apr 23, 2026 at 09:23:07PM +0000, David Matlack wrote: > During PCI enumeration, the previous kernel might have passed state about > devices that were preserved across kexec. The PCI core needs to fetch > this state to identify which devices are "incoming" and require special > handling. > +++ b/drivers/pci/liveupdate.c > +void pci_liveupdate_finish(struct pci_dev *dev) > +{ > + if (!dev->liveupdate_incoming) { > + pci_warn(dev, "Cannot finish preserving an unpreserved device\n"); > + return; > + } > + > + pci_info(dev, "Device is finished participating in Live Update\n"); > + > + /* > + * Drop the refcount so this device does not get treated as an incoming > + * device again, e.g. in case pci_liveupdate_setup_device() gets called > + * again becase the device is hot-plugged. s/becase/because/