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17 May 2024, 11:00:25 UTC
Revision a97439aa1aec10387797b4abae3cf117de1c90d7 authored by Andy Lutomirski on 15 July 2015, 17:29:41 UTC, committed by Ingo Molnar on 17 July 2015, 10:50:14 UTC 
x86/entry/64, x86/nmi/64: Add CONFIG_DEBUG_ENTRY NMI testing code
 
It turns out to be rather tedious to test the NMI nesting code.
Make it easier: add a new CONFIG_DEBUG_ENTRY option that causes
the NMI handler to pre-emptively unmask NMIs.

With this option set, errors in the repeat_nmi logic or failures
to detect that we're in a nested NMI will result in quick panics
under perf (especially if multiple counters are running at high
frequency) instead of requiring an unusual workload that
generates page faults or breakpoints inside NMIs.

I called it CONFIG_DEBUG_ENTRY instead of CONFIG_DEBUG_NMI_ENTRY
because I want to add new non-NMI checks elsewhere in the entry
code in the future, and I'd rather not add too many new config
options or add this option and then immediately rename it.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
1 parent 36f1a77
History
Tip revision: a97439aa1aec10387797b4abae3cf117de1c90d7 authored by Andy Lutomirski on 15 July 2015, 17:29:41 UTC
x86/entry/64, x86/nmi/64: Add CONFIG_DEBUG_ENTRY NMI testing code
Tip revision: a97439a
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