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| author | JP Kobryn <inwardvessel@gmail.com> | 2025-06-27 10:49:35 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-17 18:32:07 +0200 |
| commit | 82ffa3c4856c07b2bc94922fc37b40f2920267c3 (patch) | |
| tree | dbb43a5d960a38737d8a617b4db68cc10bf08f19 /arch | |
| parent | 94cd68a377ddb72c0aa30275167d3cb37e37a5cc (diff) | |
| download | linux-82ffa3c4856c07b2bc94922fc37b40f2920267c3.tar.gz linux-82ffa3c4856c07b2bc94922fc37b40f2920267c3.tar.bz2 linux-82ffa3c4856c07b2bc94922fc37b40f2920267c3.zip | |
x86/mce: Make sure CMCI banks are cleared during shutdown on Intel
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/mce/intel.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mce/intel.c b/arch/x86/kernel/cpu/mce/intel.c index 95275a5e57e0..7d0fb5e0b32f 100644 --- a/arch/x86/kernel/cpu/mce/intel.c +++ b/arch/x86/kernel/cpu/mce/intel.c @@ -500,6 +500,7 @@ void mce_intel_feature_init(struct cpuinfo_x86 *c) void mce_intel_feature_clear(struct cpuinfo_x86 *c) { intel_clear_lmce(); + cmci_clear(); } bool intel_filter_mce(struct mce *m) |