x86/fred: Add a machine check entry stub for FRED

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Like #DB, when occurred on different ring level, i.e., from user or kernel
context, #MCE needs to be handled on different stack: User #MCE on current
task stack, while kernel #MCE on a dedicated stack.

This is exactly how FRED event delivery invokes an exception handler: ring
3 event on level 0 stack, i.e., current task stack; ring 0 event on the
the FRED machine check entry stub doesn't do stack switch.

Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231205105030.8698-26-xin3.li@intel.com

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Xin Li 2023-12-05 02:50:14 -08:00 • committed by Borislav Petkov (AMD)

parent f8b8ee45f8

commit ffa4901f0e

1 changed files with 26 additions and 0 deletions

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arch/x86/kernel/cpu/mce/core.c

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