On 11/04/2022, 10:43:54, Sourabh Jain wrote: > The option CRASH_HOTPLUG enables, in kernel update to kexec segments on > hotplug events. > > All the updates needed on the capture kernel load path in the kernel for > both kexec_load and kexec_file_load system will be kept under this config. > > Signed-off-by: Sourabh Jain <sourabhj...@linux.ibm.com> > Reviewed-by: Eric DeVolder <eric.devol...@oracle.com>
Reviewed-by: Laurent Dufour <lduf...@linux.ibm.com> > --- > arch/powerpc/Kconfig | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index b779603978e1..777db33f75b5 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -623,6 +623,17 @@ config FA_DUMP > If unsure, say "y". Only special kernels like petitboot may > need to say "N" here. > > +config CRASH_HOTPLUG > + bool "kernel updates of crash kexec segments" > + depends on CRASH_DUMP && (HOTPLUG_CPU) && KEXEC_FILE > + help > + An efficient way to keep the capture kernel up-to-date with CPU > + hotplug events. On CPU hotplug event the kexec segments of capture > + kernel becomes stale and need to be updated with latest CPU data. > + In this method the kernel performs minimal update to only relevant > + kexec segments on CPU hotplug event, instead of triggering full > + capture kernel reload from userspace using udev rule. > + > config PRESERVE_FA_DUMP > bool "Preserve Firmware-assisted dump" > depends on PPC64 && PPC_POWERNV && !FA_DUMP
