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

[Samiullah Khawaja <skhawaja@google.com>]

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).
>
>Reviewed-by: Pranjal Shrivastava <praan@google.com>
>Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
>Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
>Signed-off-by: David Matlack <dmatlack@google.com>
>---
> drivers/pci/liveupdate.c       | 210 +++++++++++++++++++++++++++++++++
> drivers/pci/liveupdate.h       |  21 ++++
> drivers/pci/probe.c            |   2 +
> include/linux/pci.h            |   3 +
> include/linux/pci_liveupdate.h |  21 ++++
> 5 files changed, 257 insertions(+)
> create mode 100644 drivers/pci/liveupdate.h
>

Reviewed-by: Samiullah Khawaja <skhawaja@google.com>