Re: [PATCH v8 02/12] PCI: liveupdate: Track outgoing preserved PCI devices

[Bjorn Helgaas]

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 <praan@xxxxxxxxxx>
> Reviewed-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
> Reviewed-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Signed-off-by: David Matlack <dmatlack@xxxxxxxxxx>