On Fri, May 22, 2026 at 08:24:00PM +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 that it can be > handed off to the next kernel. > > Signed-off-by: David Matlack <[email protected]>
[...] > > /** > * struct pci_dev_ser - Serialized state about a single PCI device. > * > * @domain: The device's PCI domain number (segment). > * @bdf: The device's PCI bus, device, and function number. > - * @padding: Padding to naturally align struct pci_dev_ser. > + * @refcount: Reference count used by the PCI core to keep track of whether > it > + * is done using a device's struct pci_dev_ser. The value of the > + * refcount is equal to 1 when the struct pci_dev_ser is in use, > and > + * 0 otherwise. Note to fellow reviewers: This may seem like a bool instead of refcount, but this is changed in Patch 6. Reviewed-by: Pranjal Shrivastava <[email protected]> Thanks, Praan
