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update 98-kexec rules for crash hotplug

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In kernel, with the support of cpu/memory hotplug on crash, kdump
reloading only needs to update the elfcorehdr.

To realize the benefits, we need prevent udev from updating kdump
kernel on hot un/plug changes when detecting that the crash_hotplug
sysfs nodes are present.

Link: https://lore.kernel.org/lkml/20230814214446.6659-1-eric.devolder@oracle.com/
Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d68b4b6f307d155475cce541f2aee938032ed22e
Signed-off-by: Baoquan He <bhe@redhat.com>
This commit is contained in:
Baoquan He 2023-09-07 10:37:20 -05:00 committed by Lichen Liu
parent 2fa4739f2b
commit 69d61bb3e3
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GPG Key ID: 2ED8215EF57B3D6C
2 changed files with 8 additions and 0 deletions
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4
98-kexec.rules
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@ -1,3 +1,7 @@
# The kernel updates the crash elfcorehdr for CPU and memory changes
SUBSYSTEM=="cpu", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
SUBSYSTEM=="memory", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
SUBSYSTEM=="cpu", ACTION=="add", GOTO="kdump_reload"
SUBSYSTEM=="cpu", ACTION=="remove", GOTO="kdump_reload"
SUBSYSTEM=="memory", ACTION=="online", GOTO="kdump_reload"

4
98-kexec.rules.ppc64
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@ -1,3 +1,7 @@
# The kernel updates the crash elfcorehdr for CPU and memory changes
SUBSYSTEM=="cpu", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
SUBSYSTEM=="memory", ATTRS{crash_hotplug}=="1", GOTO="kdump_reload_end"
SUBSYSTEM=="cpu", ACTION=="online", GOTO="kdump_reload_cpu"
SUBSYSTEM=="memory", ACTION=="online", GOTO="kdump_reload_mem"
SUBSYSTEM=="memory", ACTION=="offline", GOTO="kdump_reload_mem"