linux-kernel - Re: [RFC PATCH 25/28] x86: Use PIE codegen for the core kernel

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Message-ID: <CAFULd4awNUm8MpZQ6XhPTRs6+2ZLtfnr=6vkK5DrY9L2rGR-5w@mail.gmail.com>
Date: Sun, 6 Oct 2024 21:17:40 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: David Laight <David.Laight@...lab.com>
Cc: "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>, 
	Linus Torvalds <torvalds@...ux-foundation.org>, Ard Biesheuvel <ardb+git@...gle.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "x86@...nel.org" <x86@...nel.org>, 
	Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Dennis Zhou <dennis@...nel.org>, 
	Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>, 
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Vitaly Kuznetsov <vkuznets@...hat.com>, Juergen Gross <jgross@...e.com>, 
	Boris Ostrovsky <boris.ostrovsky@...cle.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arnd Bergmann <arnd@...db.de>, 
	Masahiro Yamada <masahiroy@...nel.org>, Kees Cook <kees@...nel.org>, 
	Nathan Chancellor <nathan@...nel.org>, Keith Packard <keithp@...thp.com>, 
	Justin Stitt <justinstitt@...gle.com>, Josh Poimboeuf <jpoimboe@...nel.org>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, 
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>, 
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, 
	"xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>, 
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>, 
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>, 
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	"llvm@...ts.linux.dev" <llvm@...ts.linux.dev>
Subject: Re: [RFC PATCH 25/28] x86: Use PIE codegen for the core kernel

On Sun, Oct 6, 2024 at 8:01 PM David Laight <David.Laight@...lab.com> wrote:
>
> ...
> > Due to the non-negligible impact of PIE, perhaps some kind of
> > CONFIG_PIE config definition should be introduced, so the assembly
> > code would be able to choose optimal asm sequence when PIE and non-PIE
> > is requested?
>
> I wouldn't have thought that performance mattered in the asm code
> that runs during startup?

No, not the code that runs only once, where performance impact can be tolerated.

This one:

https://lore.kernel.org/lkml/20240925150059.3955569-44-ardb+git@google.com/

Uros.