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authorTony Luck <tony.luck@intel.com>2016-02-17 21:20:13 +0300
committerIngo Molnar <mingo@kernel.org>2016-02-18 11:28:47 +0300
commit0f68c088c0adb3c3bbeb487c4ebcde91fd5d34be (patch)
tree4aa087d9a71e7f27655d43d0a46555efd856ecf6 /Documentation/x86
parent3a2f2ac9b96f9a9f5538396a212d3b9fb543bfc5 (diff)
downloadlinux-0f68c088c0adb3c3bbeb487c4ebcde91fd5d34be.tar.xz
x86/cpufeature: Create a new synthetic cpu capability for machine check recovery
The Intel Software Developer Manual describes bit 24 in the MCG_CAP MSR: MCG_SER_P (software error recovery support present) flag, bit 24 — Indicates (when set) that the processor supports software error recovery But only some models with this capability bit set will actually generate recoverable machine checks. Check the model name and set a synthetic capability bit. Provide a command line option to set this bit anyway in case the kernel doesn't recognise the model name. Signed-off-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/2e5bfb23c89800a036fb8a45fa97a74bb16bc362.1455732970.git.tony.luck@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/x86')
-rw-r--r--Documentation/x86/x86_64/boot-options.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index 68ed3114c363..0965a71f9942 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -60,6 +60,8 @@ Machine check
threshold to 1. Enabling this may make memory predictive failure
analysis less effective if the bios sets thresholds for memory
errors since we will not see details for all errors.
+ mce=recovery
+ Force-enable recoverable machine check code paths
nomce (for compatibility with i386): same as mce=off