[PATCH v4 18/29] arm64: add POE signal support

[Mark Brown]

On Tue, May 28, 2024 at 12:26:54PM +0530, Amit Daniel Kachhap wrote:
> On 5/3/24 18:31, Joey Gouly wrote:

> > +#define POE_MAGIC	0x504f4530

> > +struct poe_context {
> > +	struct _aarch64_ctx head;
> > +	__u64 por_el0;
> > +};

> There is a comment section in the beginning which mentions the size
> of the context frame structure and subsequent reduction in the
> reserved range. So this new context description can be added there.
> Although looks like it is broken for za, zt and fpmr context.

Could you be more specific about how you think these existing contexts
are broken?  The above looks perfectly good and standard and the
existing contexts do a reasonable simulation of working.  Note that the
ZA and ZT contexts don't generate data payload unless userspace has set
PSTATE.ZA.
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