linux-kernel - [RFC PATCH v6.10 2/4] x86/xen/pvh: Move startup code into .ref.text

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Message-ID: <20240307143027.206179-8-ardb+git@google.com>
Date: Thu,  7 Mar 2024 15:30:30 +0100
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...gle.com
Cc: 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>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, 
	Arnd Bergmann <arnd@...db.de>, Kees Cook <keescook@...omium.org>, Brian Gerst <brgerst@...il.com>, 
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH v6.10 2/4] x86/xen/pvh: Move startup code into .ref.text

From: Ard Biesheuvel <ardb@...nel.org>

The Xen PVH startup code does not need to live in .head.text, given that
its entry point is not at a fixed offset, and is communicated to the
host/VMM via an ELF note.

So move it out of .head.text into another code section. To avoid
spurious warnings about references to .init code, move it into .ref.text
rather than .text. (Note that the ELF note itself is not .init and so
moving this code into .init.text would result in warnings as well)

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/x86/platform/pvh/head.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S
index f7235ef87bc3..0cf6008e834b 100644
--- a/arch/x86/platform/pvh/head.S
+++ b/arch/x86/platform/pvh/head.S
@@ -20,7 +20,7 @@
 #include <asm/nospec-branch.h>
 #include <xen/interface/elfnote.h>
 
-	__HEAD
+	__REF
 
 /*
  * Entry point for PVH guests.
-- 
2.44.0.278.ge034bb2e1d-goog