mirror of https://gitee.com/openkylin/linux.git
x86/entry, mce: Disallow #DB during #MC
#MC is fragile as heck, don't tempt fate. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20200529213321.131187767@infradead.org
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@ -1943,22 +1943,34 @@ static __always_inline void exc_machine_check_user(struct pt_regs *regs)
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/* MCE hit kernel mode */
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DEFINE_IDTENTRY_MCE(exc_machine_check)
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{
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unsigned long dr7;
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dr7 = local_db_save();
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exc_machine_check_kernel(regs);
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local_db_restore(dr7);
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}
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/* The user mode variant. */
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DEFINE_IDTENTRY_MCE_USER(exc_machine_check)
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{
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unsigned long dr7;
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dr7 = local_db_save();
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exc_machine_check_user(regs);
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local_db_restore(dr7);
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}
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#else
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/* 32bit unified entry point */
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DEFINE_IDTENTRY_MCE(exc_machine_check)
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{
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unsigned long dr7;
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dr7 = local_db_save();
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if (user_mode(regs))
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exc_machine_check_user(regs);
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else
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exc_machine_check_kernel(regs);
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local_db_restore(dr7);
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}
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#endif
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