linux-kernel - Re: [PATCH v5 0/6] x86: Refactor and consolidate startup code

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Message-ID: <aAf0K4sMd8brAQ_z@gmail.com>
Date: Tue, 22 Apr 2025 21:55:23 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Ard Biesheuvel <ardb+git@...gle.com>
Cc: linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org, x86@...nel.org,
	Ard Biesheuvel <ardb@...nel.org>,
	Tom Lendacky <thomas.lendacky@....com>,
	Dionna Amalie Glaze <dionnaglaze@...gle.com>,
	Kevin Loughlin <kevinloughlin@...gle.com>
Subject: Re: [PATCH v5 0/6] x86: Refactor and consolidate startup code


* Ard Biesheuvel <ardb+git@...gle.com> wrote:

>  10 files changed, 1757 insertions(+), 1724 deletions(-)

So I think this is a new build warning/failure (config attached),
from objtool:

  arch/x86/boot/startup/sev-startup.o: warning: objtool: vc_check_opcode_bytes+0x53: can't find switch jump table

Note that it's a randconfig.

No such warning triggers on:

  a1b582a3ff61 Merge branch 'x86/urgent' into x86/boot, to merge dependent commit and upstream fixes

which is the base of the commits:

  ff4c0560ab02 x86/asm: Retire RIP_REL_REF()
  681e2901330c x86/boot: Drop RIP_REL_REF() uses from early SEV code
  a3cbbb4717e1 x86/boot: Move SEV startup code into startup/
  234cf67fc3bd x86/sev: Split off startup code from core code
  b66fcee1574e x86/sev: Move noinstr NMI handling code into separate source file
  092071e0f63c vmlinux.lds: Include .data.rel[.local] into .data section
  a1b582a3ff61 Merge branch 'x86/urgent' into x86/boot, to merge dependent commit and upstream fixes

Unsurprisingly:

  starship:~/tip> git bisect bad

  a3cbbb4717e120f9e53fa7685909b310f7e99bf5 is the first bad commit
  commit a3cbbb4717e120f9e53fa7685909b310f7e99bf5 (HEAD)
  Author: Ard Biesheuvel <ardb@...nel.org>
  Date:   Fri Apr 18 16:12:58 2025 +0200

    x86/boot: Move SEV startup code into startup/

Thanks,

	Ingo

View attachment "config" of type "text/plain" (211888 bytes)