On Thu, Aug 13, 2020 at 08:03:21AM +0200, Andrew Jones wrote:
> Thinking about this some more, maybe we don't need pauth-arch.
> If we don't, then it simplifies nicely to
>
> # Default (enabled with architected algorithm)
> -cpu max[,pauth=on][,pauth-fast=off]
>
> # Select pauth-fast
> -cpu max[,pauth=on],pauth-fast=on
One reason that users may wish to choose the IMP-DEF algorithm is for
functional testing regardless of speed (since APA+GPA / API+GPI depend
on whether the algo is architected or imp-def).
Given that, I think that "impdef" is a better option name than
"pauth-fast", and speed is a benefit but not the only reason to use the
option.
How about hacing a 'pauth-algo' option which defaults to architected,
e.g.
| -cpu max,pauth={on,off},pauth-algo={impdef,architected}
... then in future the 'pauth={on,off}' bit could de extended to cover
FPAC version etc independently of the algorithm, but for now that can be
a boolean.
Thanks,
Mark.
