[Skiboot] [PATCH] mambo: disable OPAL_SIGNAL_SYSTEM_RESET

Stewart Smith stewart at linux.ibm.com
Wed Aug 1 15:03:09 AEST 2018

Nicholas Piggin <npiggin at gmail.com> writes:
> On Thu, 26 Jul 2018 18:03:50 +1000
> Stewart Smith <stewart at linux.ibm.com> wrote:
>> Nicholas Piggin <npiggin at gmail.com> writes:
>> > mambo does not deliver system reset interrupts correctly (details in
>> > the added comment), so disable it for now.
>> >
>> > Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
>> > --
>> >
>> > This feature was useful for developing the NMI IPI system in Linux,
>> > but now it's somewhat working, and we've got OPAL_SIGNAL_SYSTEM_RESET
>> > implemented on real hardware (and equivalent hypercall for QEMU
>> > guests), it is less important now. It's annoing because it causes
>> > breaking to xmon to usually often crash the kernel in an SMP sim.  
>> (looking back at patches I've neglected in patchwork as I have a notmuch
>> query for that now)
>> I'm interested in another alternative as we do have stupid unittests for
>> part of this code that is nice to have work.
>> I guess we could look at what idle states are enabled, and for the unit
>> tests, just enable none of them?
> Yeah that could work for unit tests. One day if we get mambo fixed we
> could turn it back on too. I'll have to get back to looking at that,
> but I've had enough system reset problems for the moment :) The mambo
> devs are busy with other things too I think.

Yeah, there's probably a few things above this on the TODO list for
them :)

I'll see if I can be bothered whipping up a patch shortly.

Stewart Smith
OPAL Architect, IBM.

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