Re: [PATCH v7 11/23] KVM: arm64: Share arm64 code with s390

[Marc Zyngier]

On Wed, 02 Sep 2026 13:41:52 +0100,
Steffen Eiden <seiden@xxxxxxxxxxxxx> wrote:

[...]

> So my suggestion is:
> 
> For series 1 (and 2) s390 has its own, local implementation of
> handle_exit without sharing any code with arm64 in regard to EC
> 
> When s390 has all the relevant code available (likely series 3) s390 can
> switch to using most (if not all) EC handling code used by
> arm_exit_handlers implemented in handle_exit.c.
> 
> This can be done without a mixed patch:
> 
> 1. Mark arm64 handle_exit.c as shared (roughly the first 400Loc w/o
>    includes) - s390 will not use it after this patch.
> 2. remove the handle exit code from s390's handle_exit.c and include the
>    new generated handle_exit.inc
> 
> This approach brings us further into the share architecture not only code
> approach you meantrioned in the comments regarding sys-regs. (I or
> Andreas will provide a solution for this later :) ) 
> 
> Is that OK with you, what do you think?

I *think* that's OK. I just want to make sure that in the long run, we
don't end-up with pointless divergence.

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.