On 4/8/22 03:07, Baoquan He wrote:
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>
Excellent, thanks!
eric
---
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
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