This patch is based on suggestions from paulus and benh. The bugs are all mine. The idea was to implement soft NMI(s) by keeping interrupts enabled in the soft-disabled state, but to use the interrupt controller to gate posting of new interrupts to the processor. This is still work in progress and a preliminary RFC that needs testing.
Nick posted a more comprehensive version for soft NMI at https://patchwork.ozlabs.org/patch/704605/, but it does not work when interrupts are disabled Cc: Michael Ellerman <m...@ellerman.id.au> Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> Cc: Paul Mackerras <pau...@samba.org> Cc: Nicholas Piggin <npig...@gmail.com> Balbir Singh (2): Merge IPI and DEFAULT priorities Keep interrupts enabled even on soft disable arch/powerpc/include/asm/paca.h | 1 + arch/powerpc/include/asm/xics.h | 8 ++------ arch/powerpc/kernel/exceptions-64s.S | 17 ++++++++++------- arch/powerpc/kernel/irq.c | 21 ++++++++++++++++++++- arch/powerpc/kernel/time.c | 27 ++++++++++++++++++++++++++- 5 files changed, 59 insertions(+), 15 deletions(-) -- 2.9.3
