linux-kernel - [PATCH 14/46] x86/sev, lto: Mark cpuid_table_copy as __visible_on

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Date:   Mon, 14 Nov 2022 12:43:12 +0100
From:   "Jiri Slaby (SUSE)" <jirislaby@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Martin Liska <mliska@...e.cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 14/46] x86/sev, lto: Mark cpuid_table_copy as __visible_on_lto

From: Martin Liska <mliska@...e.cz>

Symbols referenced from assembler (either directly or e.f. from
DEFINE_STATIC_KEY()) need to be global and visible in gcc LTO because
they could end up in a different object file than the assembler. This
can lead to linker errors without this patch.

So mark cpuid_table_copy as __visible_on_lto.

[js] use __visible_on_lto

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org
Signed-off-by: Martin Liska <mliska@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/x86/kernel/sev-shared.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
index 3a5b0c9c4fcc..554da8aabfc7 100644
--- a/arch/x86/kernel/sev-shared.c
+++ b/arch/x86/kernel/sev-shared.c
@@ -64,7 +64,7 @@ struct snp_cpuid_table {
 static u16 ghcb_version __ro_after_init;
 
 /* Copy of the SNP firmware's CPUID page. */
-static struct snp_cpuid_table cpuid_table_copy __ro_after_init;
+__visible_on_lto struct snp_cpuid_table cpuid_table_copy __ro_after_init;
 
 /*
  * These will be initialized based on CPUID table so that non-present
-- 
2.38.1