[PATCH v2] arm64: Add basic JSON register parser

[Mark Brown]

On Mon, Jan 06, 2025 at 04:30:18PM +0000, Marc Zyngier wrote:

> The moment you use a general purpose language, you end-up reinventing
> JSON in another way, and I didn't have the courage to do that. Also,
> jq feels like an exotic mix of functional programming and Forth,
> something toxic enough to be irresistible.

Yeah, it's super neat for the inline processing stuff.

> Mark Brown <broonie at kernel.org> wrote:

> > then we can hopefully use that for things like diffing two architecture
> > versions while handling cases where we've intentionally diverged from
> > how the architecture describes things. It'd be nice to have something
> > that'd go through and check for updates to registers we already have
> > mapped and provide an updated sysreg file.  It might however just be
> > easier to use something like this and then work with sysreg files using
> > text processing tools.

> My current plan is somehow different: extract all the trapping
> information for each register handled by KVM, and *automatically*
> generate tests that check that KVM is doing the right thing. Or rather
> convince someone to do that.

> Then get rid of all such manually implemented tests from the kernel,
> once and for all.

That would be awesome - there's far too much stuff needs typing in
there.  There's a bunch of these places where we either already use
register data or could use it if it required less typing/verification to
do so, the ideas I mentioned were just the first things that popped into
my mind.  Having a reliable machine readable data source for this
information is going to be *so* helpful.
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