x86/entry: Implement user mode C entry points for #DB and #MCE

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The MCE entry point uses the same mechanism as the IST entry point for
now. For #DB split the inner workings and just keep the nmi_enter/exit()
magic in the IST variant. Fixup the ASM code to emit the proper
noist_##cfunc call.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200505135315.177564104@linutronix.de

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This commit is contained in:

Thomas Gleixner 2020-02-25 23:33:29 +01:00

parent f08e32ec3c

commit 4c0dcd8350

3 changed files with 88 additions and 24 deletions

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2

arch/x86/entry/entry_64.S

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48

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

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74

arch/x86/kernel/traps.c

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