On Fri, 10 Jul 2026 21:26:08 +0000, David Matlack <[email protected]> wrote: > During a Live Update, preserved devices must be allowed to continue > performing memory transactions so the kernel cannot change the fabric > topology, including bus numbers, since that would require disabling > and flushing any memory transactions first. > > To keep bus numbers constant, always inherit the secondary and > subordinate bus numbers assigned to bridges during scanning, instead of > assigning new ones, if any PCI devices are being preserved. Note that > the kernel inherits bus numbers even on bridges without any downstream > endpoints that were preserved. This avoids accidentally assigning a > bridge a new window that overlaps with a preserved device that is > downstream of a different bridge. > > [...]
Reviewed-by: Pasha Tatashin <[email protected]> -- Pasha Tatashin <[email protected]>
