On 3/21/22 03:04, 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 <sourabhjain@xxxxxxxxxxxxx>
Reviewed-by: Eric DeVolder <eric.devolder@xxxxxxxxxx>
---
arch/powerpc/Kconfig | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index b779603978e1..b816339ef8c7 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 hotplug event (CPU/memory) the kexec segments
+ of capture kernel becomes stale and need to be updated with latest
+ CPU and memory regions. In this method the kernel performs minimal
+ update to only relevant kexec segments on CPU hotplug event, instead
+ of triggering full capture reload from userspace using udev rule.
+
config PRESERVE_FA_DUMP
bool "Preserve Firmware-assisted dump"
depends on PPC64 && PPC_POWERNV && !FA_DUMP
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