linux-kernel - [RFC PATCH 31/34] x86/bugs: Add attack vector controls for spectre

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Message-ID: <20240912190857.235849-32-david.kaplan@amd.com>
Date: Thu, 12 Sep 2024 14:08:54 -0500
From: David Kaplan <david.kaplan@....com>
To: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>,
	Peter Zijlstra <peterz@...radead.org>, Josh Poimboeuf <jpoimboe@...nel.org>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>, Ingo Molnar
	<mingo@...hat.com>, Dave Hansen <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>, "H . Peter Anvin" <hpa@...or.com>
CC: <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 31/34] x86/bugs: Add attack vector controls for spectre_v2

Use attack vector controls to determine if spectre_v2 mitigation is
required.

Signed-off-by: David Kaplan <david.kaplan@....com>
---
 arch/x86/kernel/cpu/bugs.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index cc26f5680523..9c920e2b4f33 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1957,13 +1957,15 @@ static void __init spectre_v2_select_mitigation(void)
 	case SPECTRE_V2_CMD_NONE:
 		return;
 
-	case SPECTRE_V2_CMD_FORCE:
 	case SPECTRE_V2_CMD_AUTO:
+		if (!should_mitigate_vuln(SPECTRE_V2))
+			break;
+		fallthrough;
+	case SPECTRE_V2_CMD_FORCE:
 		if (boot_cpu_has(X86_FEATURE_IBRS_ENHANCED)) {
 			mode = SPECTRE_V2_EIBRS;
 			break;
 		}
-
 		mode = spectre_v2_select_retpoline();
 		break;
 
-- 
2.34.1