On 18/09/15 06:11, Jon Masters wrote:
On Sep 14, 2015, at 06:26, Daniel Thompson daniel.thompson@linaro.org wrote: This patchset provides a pseudo-NMI for arm64 kernels by reimplementing the irqflags macros to modify the GIC PMR (the priority mask register is accessible as a system register on GICv3 and later) rather than the PSR. The patchset includes an implementation of arch_trigger_all_cpu_backtrace() for arm64 allowing the new code to be exercised.
I think there is a need to connect a few dots on this next week during Connect. Some other conversations have discussed alternative implementations elsewhere. I will assist.
Fine by me.
I'd be very happy to talk about alternative approaches. In the past I've had long conversations about trapping to ARM TF as a means to simulate NMI. I haven't written any code to move in this direction but I still think of it as being the future-areas-of-interest pile.
That said, whenever I search for (what I think are) sensible keywords for this subject I generally only find my own work! I may be selecting a rather blinkered set of keywords when I search but nevertheless it does mean I will probably have to rely on you to make introductions!
Daniel.