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powerpc/64s: Disallow system reset vs system reset reentrancy

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In preparation for using a dedicated stack for system reset interrupts,
prevent a nested system reset from recovering, in order to simplify
code that is called in crash/debug path. This allows a system reset
interrupt to just use the base stack pointer.

Keep an in_nmi nesting counter similarly to the in_mce counter. Consider
the interrrupt non-recoverable if it is taken inside another system
reset.

Interrupt nesting could be allowed similarly to MCE, but system reset
is a special case that's not for normal operation, so simplicity wins
until there is requirement for nested system reset interrupts.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2016-12-20 04:30:05 +10:00 • committed by Michael Ellerman
parent a3d96f70c1
commit c4f3b52ce7
6 changed files with 51 additions and 7 deletions
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6
arch/powerpc/include/asm/exception-64s.h
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@ -275,6 +275,12 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
#endif
/* Do not enable RI */
#define EXCEPTION_PROLOG_PSERIES_NORI(area, label, h, extra, vec) \
EXCEPTION_PROLOG_0(area); \
EXCEPTION_PROLOG_1(area, extra, vec); \
EXCEPTION_PROLOG_PSERIES_1_NORI(label, h);
#define __KVM_HANDLER(area, h, n) \
BEGIN_FTR_SECTION_NESTED(947) \