On 04/01/22 at 02:30pm, Eric DeVolder wrote: > CRASH_HOTPLUG is to enable cpu and memory hotplug support of crash. > > CRASH_HOTPLUG_ELFCOREHDR_SZ is used to specify the maximum size of > the elfcorehdr buffer/segment. > > This is a preparation for later usage. > > Signed-off-by: Eric DeVolder <eric.devolder@xxxxxxxxxx> LGTM, Acked-by: Baoquan He <bhe@xxxxxxxxxx> > --- > arch/x86/Kconfig | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 7340d9f01b62..8b51d3196b82 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -2072,6 +2072,32 @@ config CRASH_DUMP > (CONFIG_RELOCATABLE=y). > For more details see Documentation/admin-guide/kdump/kdump.rst > > +config CRASH_HOTPLUG > + bool "kernel updates of crash elfcorehdr" > + depends on CRASH_DUMP && (HOTPLUG_CPU || MEMORY_HOTPLUG) && KEXEC_FILE > + help > + Enable the kernel to update the crash elfcorehdr (which contains > + the list of CPUs and memory regions) directly when hot plug/unplug > + of CPUs or memory. Otherwise userspace must monitor these hot > + plug/unplug change notifications via udev in order to > + unload-then-reload the crash kernel so that the list of CPUs and > + memory regions is kept up-to-date. Note that the udev CPU and > + memory change notifications still occur (however, userspace is not > + required to monitor for crash dump purposes). > + > +config CRASH_HOTPLUG_ELFCOREHDR_SZ > + depends on CRASH_HOTPLUG > + int > + default 131072 > + help > + Specify the maximum size of the elfcorehdr buffer/segment. > + The 128KiB default is sized so that it can accommodate 2048 > + Elf64_Phdr, where each Phdr represents either a CPU or a > + region of memory. > + For example, this size can accommodate a machine with up to 1024 > + CPUs and up to 1024 memory regions, eg. as represented by the > + 'System RAM' entries in /proc/iomem. > + > config KEXEC_JUMP > bool "kexec jump" > depends on KEXEC && HIBERNATION > -- > 2.27.0 > _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
