Re: [RFC PATCH v2 0/7] Pseudo-NMI for arm64 using ICC_PMR_EL1 (GICv3)

From	Daniel Thompson <daniel.thompson@linaro.org>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH v2 0/7] Pseudo-NMI for arm64 using ICC_PMR_EL1 (GICv3)
Date	2015-09-18 12:30 +0200
Message-ID	<qa15w-8i7-5@gated-at.bofh.it> (permalink)
References	<q8BZv-7sD-7@gated-at.bofh.it> <q9WIy-1Wn-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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.
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[RFC PATCH v2 0/7] Pseudo-NMI for arm64 using ICC_PMR_EL1 (GICv3) Daniel Thompson <daniel.thompson@linaro.org> - 2015-09-14 15:30 +0200
  [RFC PATCH v2 2/7] arm64: Add support for on-demand backtrace of other CPUs Daniel Thompson <daniel.thompson@linaro.org> - 2015-09-14 15:30 +0200
  [RFC PATCH v2 1/7] irqchip: gic-v3: Reset BPR during initialization Daniel Thompson <daniel.thompson@linaro.org> - 2015-09-14 15:30 +0200
  [RFC PATCH v2 5/7] arm64: irqflags: Use ICC sysregs to implement IRQ masking Daniel Thompson <daniel.thompson@linaro.org> - 2015-09-14 15:40 +0200
  Re: [RFC PATCH v2 0/7] Pseudo-NMI for arm64 using ICC_PMR_EL1 (GICv3) Jon Masters <jonathan@jonmasters.org> - 2015-09-18 07:50 +0200
    Re: [RFC PATCH v2 0/7] Pseudo-NMI for arm64 using ICC_PMR_EL1 (GICv3) Daniel Thompson <daniel.thompson@linaro.org> - 2015-09-18 12:30 +0200

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