From: Sourabh Jain <sourabhjain@linux.ibm.com> To: linuxppc-dev@ozlabs.org, mpe@ellerman.id.au Cc: eric.devolder@oracle.com, bhe@redhat.com, mahesh@linux.vnet.ibm.com, kexec@lists.infradead.org, ldufour@linux.ibm.com, hbathini@linux.ibm.com Subject: [RFC v4 PATCH 2/5] powerpc/crash hp: introduce a new config option CRASH_HOTPLUG Date: Mon, 11 Apr 2022 14:13:54 +0530 [thread overview] Message-ID: <20220411084357.157308-3-sourabhjain@linux.ibm.com> (raw) In-Reply-To: <20220411084357.157308-1-sourabhjain@linux.ibm.com> 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@linux.ibm.com> Reviewed-by: Eric DeVolder <eric.devolder@oracle.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 -- 2.35.1
WARNING: multiple messages have this Message-ID (diff)
From: Sourabh Jain <sourabhjain@linux.ibm.com> To: kexec@lists.infradead.org Subject: [RFC v4 PATCH 2/5] powerpc/crash hp: introduce a new config option CRASH_HOTPLUG Date: Mon, 11 Apr 2022 14:13:54 +0530 [thread overview] Message-ID: <20220411084357.157308-3-sourabhjain@linux.ibm.com> (raw) In-Reply-To: <20220411084357.157308-1-sourabhjain@linux.ibm.com> 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@linux.ibm.com> Reviewed-by: Eric DeVolder <eric.devolder@oracle.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 -- 2.35.1
next prev parent reply other threads:[~2022-04-11 8:45 UTC|newest] Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-04-11 8:43 [RFC v4 PATCH 0/5] In kernel handling of CPU hotplug events for crash kernel Sourabh Jain 2022-04-11 8:43 ` Sourabh Jain 2022-04-11 8:43 ` [RFC v4 PATCH 1/5] powerpc/kexec: make update_cpus_node non-static Sourabh Jain 2022-04-11 8:43 ` Sourabh Jain 2022-04-11 8:43 ` Sourabh Jain [this message] 2022-04-11 8:43 ` [RFC v4 PATCH 2/5] powerpc/crash hp: introduce a new config option CRASH_HOTPLUG Sourabh Jain 2022-04-14 16:40 ` Laurent Dufour 2022-04-14 16:40 ` Laurent Dufour 2022-04-19 8:20 ` Sourabh Jain 2022-04-19 8:20 ` Sourabh Jain 2022-04-21 11:34 ` Michael Ellerman 2022-04-21 11:34 ` Michael Ellerman 2022-04-21 15:29 ` Eric DeVolder 2022-04-21 15:29 ` Eric DeVolder 2022-04-22 4:22 ` Michael Ellerman 2022-04-22 4:22 ` Michael Ellerman 2022-04-26 4:10 ` Sourabh Jain 2022-04-26 4:10 ` Sourabh Jain 2022-04-26 3:47 ` Sourabh Jain 2022-04-26 3:47 ` Sourabh Jain 2022-04-11 8:43 ` [RFC v4 PATCH 3/5] powrepc/crash hp: update kimage_arch struct Sourabh Jain 2022-04-11 8:43 ` Sourabh Jain 2022-04-14 16:35 ` Laurent Dufour 2022-04-14 16:35 ` Laurent Dufour 2022-04-19 8:21 ` Sourabh Jain 2022-04-19 8:21 ` Sourabh Jain 2022-04-11 8:43 ` [RFC v4 PATCH 4/5] powerpc/crash hp: add crash hotplug support for kexec_file_load Sourabh Jain 2022-04-11 8:43 ` Sourabh Jain 2022-04-14 16:32 ` Laurent Dufour 2022-04-14 16:32 ` Laurent Dufour 2022-04-19 8:31 ` Sourabh Jain 2022-04-19 8:31 ` Sourabh Jain 2022-04-21 15:33 ` Eric DeVolder 2022-04-21 15:33 ` Eric DeVolder 2022-04-11 8:43 ` [RFC v4 PATCH 5/5] powerpc/crash hp: add crash hotplug support for kexec_load Sourabh Jain 2022-04-11 8:43 ` Sourabh Jain 2022-04-14 16:39 ` Laurent Dufour 2022-04-14 16:39 ` Laurent Dufour
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