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| author | Nicholas Piggin <npiggin@gmail.com> | 2016-12-19 21:30:05 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-04-28 14:02:25 +0300 |
| commit | c4f3b52ce7b16824befb16ab3d045c891b08b7db (patch) | |
| tree | 92f77ba25144dbe046368583e18e21c83015e642 /arch/powerpc/include/asm/exception-64s.h | |
| parent | a3d96f70c14773d0928c6a54fd278138f0868572 (diff) | |
| download | linux-c4f3b52ce7b16824befb16ab3d045c891b08b7db.tar.xz | |
powerpc/64s: Disallow system reset vs system reset reentrancy
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>
Diffstat (limited to 'arch/powerpc/include/asm/exception-64s.h')
| -rw-r--r-- | arch/powerpc/include/asm/exception-64s.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/exception-64s.h b/arch/powerpc/include/asm/exception-64s.h index 63a309a432ad..59134ebd7d49 100644 --- a/arch/powerpc/include/asm/exception-64s.h +++ b/arch/powerpc/include/asm/exception-64s.h @@ -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) \ |