Re: [PATCH v2 3/3] x86/boot: Implement early memory acceptance for SEV-SNP

[Ard Biesheuvel]

On Mon, 7 Apr 2025 at 18:44, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
>
>
> * Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
>
> > On Fri, Apr 04, 2025 at 08:07:03AM -0700, Dionna Amalie Glaze wrote:
> > > If the GHCB is available, we should always prefer it.
> >
> > I believe we should consider the cost of code duplication in this
> > situation.
> >
> > If the non-early version is only used in the kexec path, it will not be
> > tested as frequently and could be more easily broken. I think it would be
> > acceptable for kexec to be slightly slower if it results in more
> > maintainable code.
>
> Absolutely so.
>

It would be nice if someone could quantify 'slightly slower' - I am
leaning to the same conclusion but I have no clue what the actual
performance impact is.