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x86/mce: Make sure CMCI banks are cleared during shutdown on Intel

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commit 30ad231a5029bfa16e46ce868497b1a5cdd3c24d upstream.

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
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
JP Kobryn 2025-06-27 10:49:35 -07:00 • committed by Greg Kroah-Hartman
commit 7c2bc303a0
1 changed files with 1 additions and 0 deletions
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1
arch/x86/kernel/cpu/mce/intel.c
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@ -516,4 +516,5 @@ void mce_intel_feature_init(struct cpuinfo_x86 *c)
void mce_intel_feature_clear(struct cpuinfo_x86 *c)
{
intel_clear_lmce();
cmci_clear();
}