linux-kernel - Re: [RFC PATCH v2 0/7] Pseudo-NMI for arm64 using ICC_PMR

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Message-ID: <55FBF42B.2090806@linaro.org>
Date:	Fri, 18 Sep 2015 12:23:23 +0100
From:	Daniel Thompson <daniel.thompson@...aro.org>
To:	Jon Masters <jonathan@...masters.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"patches@...aro.org" <patches@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave Martin <dave.martin@....com>,
	Andrew Thoelke <andrew.thoelke@....com>
Subject: Re: [RFC PATCH v2 0/7] Pseudo-NMI for arm64 using ICC_PMR_EL1 (GICv3)

On 18/09/15 06:11, Jon Masters wrote:
>> On Sep 14, 2015, at 06:26, Daniel Thompson <daniel.thompson@...aro.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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