[RFT,v2,23/23] x86/boot: Get rid of the .head.text section

Message ID	20250504095230.2932860-48-ardb+git@google.com
State	New
Headers	show Received: from mail-wm1-f73.google.com (mail-wm1-f73.google.com [209.85.128.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5891B1F3B8D for <linux-efi@vger.kernel.org>; Sun, 4 May 2025 09:53:53 +0000 (UTC) Date: Sun, 4 May 2025 11:52:53 +0200 In-Reply-To: <20250504095230.2932860-25-ardb+git@google.com> Precedence: bulk Mime-Version: 1.0 References: <20250504095230.2932860-25-ardb+git@google.com> Message-ID: <20250504095230.2932860-48-ardb+git@google.com> Subject: [RFT PATCH v2 23/23] x86/boot: Get rid of the .head.text section From: Ard Biesheuvel <ardb+git@google.com> To: linux-kernel@vger.kernel.org Cc: linux-efi@vger.kernel.org, x86@kernel.org, Ard Biesheuvel <ardb@kernel.org>, Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@kernel.org>, Dionna Amalie Glaze <dionnaglaze@google.com>, Kevin Loughlin <kevinloughlin@google.com>, Tom Lendacky <thomas.lendacky@amd.com> Content-Type: text/plain; charset="UTF-8"
Series	x86: strict separation of startup code \| expand [RFT,v2,00/23] x86: strict separation of startup code [RFT,v2,01/23] x86/boot: Move early_setup_gdt() back into head64.c [RFT,v2,03/23] x86/boot: Drop global variables keeping track of LA57 state [RFT,v2,06/23] x86/sev: Disentangle #VC handling code from startup code [RFT,v2,07/23] x86/sev: Separate MSR and GHCB based snp_cpuid() via a callback [RFT,v2,08/23] x86/sev: Fall back to early page state change code only during boot [RFT,v2,09/23] x86/sev: Move GHCB page based HV communication out of startup code [RFT,v2,10/23] x86/sev: Use boot SVSM CA for all startup and init code [RFT,v2,11/23] x86/boot: Drop redundant RMPADJUST in SEV SVSM presence check [RFT,v2,12/23] x86/sev: Unify SEV-SNP hypervisor feature check [RFT,v2,13/23] x86/linkage: Add SYM_PIC_ALIAS() macro helper to emit symbol aliases [RFT,v2,15/23] x86/boot: Provide __pti_set_user_pgtbl() to startup code [RFT,v2,16/23] x86/sev: Provide PIC aliases for SEV related data objects [RFT,v2,17/23] x86/sev: Move __sev_[get\|put]_ghcb() into separate noinstr object [RFT,v2,18/23] x86/sev: Export startup routines for ordinary use [RFT,v2,19/23] x86/boot: Created a confined code area for startup code [RFT,v2,20/23] x86/boot: Move startup code out of __head section [RFT,v2,21/23] x86/boot: Disallow absolute symbol references in startup code [RFT,v2,22/23] x86/boot: Revert "Reject absolute references in .head.text" [RFT,v2,23/23] x86/boot: Get rid of the .head.text section

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20250504095230.2932860-48-ardb+git@google.com

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Date: Sun,  4 May 2025 11:52:53 +0200
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Message-ID: <20250504095230.2932860-48-ardb+git@google.com>
Subject: [RFT PATCH v2 23/23] x86/boot: Get rid of the .head.text section
From: Ard Biesheuvel <ardb+git@google.com>
To: linux-kernel@vger.kernel.org
Cc: linux-efi@vger.kernel.org, x86@kernel.org,
	Ard Biesheuvel <ardb@kernel.org>, Borislav Petkov <bp@alien8.de>,
 Ingo Molnar <mingo@kernel.org>,
	Dionna Amalie Glaze <dionnaglaze@google.com>,
 Kevin Loughlin <kevinloughlin@google.com>,
	Tom Lendacky <thomas.lendacky@amd.com>
Content-Type: text/plain; charset="UTF-8"

Series

x86: strict separation of startup code | expand

Commit Message

Ard Biesheuvel May 4, 2025, 9:52 a.m. UTC

From: Ard Biesheuvel <ardb@kernel.org>

The .head.text section is now empty, so it can be dropped from the
linker script.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/x86/kernel/vmlinux.lds.S | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 4aaa1693b262..af8bc4a6f6c3 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -160,11 +160,6 @@  SECTIONS
 
 	} :text = 0xcccccccc
 
-	/* bootstrapping code */
-	.head.text : AT(ADDR(.head.text) - LOAD_OFFSET) {
-		HEAD_TEXT
-	} :text = 0xcccccccc
-
 	/* End of text section, which should occupy whole number of pages */
 	_etext = .;
 	. = ALIGN(PAGE_SIZE);

[RFT,v2,23/23] x86/boot: Get rid of the .head.text section

Commit Message

Patch