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Message-ID: <20240220184513.GAZdTzOQN33Nccwkno@fat_crate.local>
Date: Tue, 20 Feb 2024 19:45:13 +0100
From: Borislav Petkov <bp@...en8.de>
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
Kevin Loughlin <kevinloughlin@...gle.com>,
Tom Lendacky <thomas.lendacky@....com>,
Dionna Glaze <dionnaglaze@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Andy Lutomirski <luto@...nel.org>, Arnd Bergmann <arnd@...db.de>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Justin Stitt <justinstitt@...gle.com>,
Kees Cook <keescook@...omium.org>, Brian Gerst <brgerst@...il.com>,
linux-arch@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v4 04/11] x86/startup_64: Defer assignment of 5-level
paging global variables
On Tue, Feb 13, 2024 at 01:41:48PM +0100, Ard Biesheuvel wrote:
> From: Ard Biesheuvel <ardb@...nel.org>
>
> Assigning the 5-level paging related global variables from the earliest
> C code using explicit references that use the 1:1 translation of memory
> is unnecessary, as the startup code itself does not rely on them to
> create the initial page tables, and this is all it should be doing. So
> defer these assignments to the primary C entry code that executes via
> the ordinary kernel virtual mapping.
>
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> ---
> arch/x86/kernel/head64.c | 44 +++++++-------------
> 1 file changed, 14 insertions(+), 30 deletions(-)
Whoops:
arch/x86/kernel/head64.c: In function ‘x86_64_start_kernel’:
arch/x86/kernel/head64.c:442:17: error: ‘__pgtable_l5_enabled’ undeclared (first use in this function); did you mean ‘pgtable_l5_enabled’?
442 | __pgtable_l5_enabled = 1;
| ^~~~~~~~~~~~~~~~~~~~
| pgtable_l5_enabled
arch/x86/kernel/head64.c:442:17: note: each undeclared identifier is reported only once for each function it appears in
make[4]: *** [scripts/Makefile.build:243: arch/x86/kernel/head64.o] Error 1
make[3]: *** [scripts/Makefile.build:481: arch/x86/kernel] Error 2
make[2]: *** [scripts/Makefile.build:481: arch/x86] Error 2
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [/mnt/kernel/kernel/2nd/linux/Makefile:1921: .] Error 2
make: *** [Makefile:240: __sub-make] Error 2
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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