On 13.09.2023 22:27, Andrew Cooper wrote:
> All other SPEC_CTRL_{ENTRY,EXIT}_* helpers hold stack_end in %r14. Adjust it
> for consistency, freeing up %rbx to be used differently.
>
> Signed-off-by: Andrew Cooper <[email protected]>
Reviewed-by: Jan Beulich <[email protected]>
The choice of %rbx was, iirc, for avoiding unnecessary code size increase
(due to extra REX prefixes needed in some of the affected insns). I
understand you view this as not a real concern, but I think saying so
explicitly in the description would be at least desirable. After all there
would also be the alternative of further parametrizing the involved macros.
Jan
