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JP Kobryn 30ad231a50 x86/mce: Make sure CMCI banks are cleared during shutdown on Intel

CMCI banks are not cleared during shutdown on Intel CPUs. As a side effect,
when a kexec is performed, CPUs coming back online are unable to
rediscover/claim these occupied banks which breaks MCE reporting.

Clear the CPU ownership during shutdown via cmci_clear() so the banks can
be reclaimed and MCE reporting will become functional once more.

  [ bp: Massage commit message. ]

Reported-by: Aijay Adams <aijay@meta.com>
Signed-off-by: JP Kobryn <inwardvessel@gmail.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/20250627174935.95194-1-inwardvessel@gmail.com

2025-06-28 12:45:48 +02:00

amd.c

x86/mce/amd: Fix threshold limit reset

2025-06-27 13:16:23 +02:00

apei.c

x86/mce/apei: Handle variable SMCA BERT record size

2024-10-31 10:45:59 +01:00

core.c

x86/mce: Ensure user polling settings are honored when restarting timer

2025-06-27 12:41:44 +02:00

dev-mcelog.c

x86/mce/mcelog: Use xchg() to get and clear the flags