linux-kernel - [RFC PATCH 32/34] x86/bugs: Add attack vector controls for l1tf

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Message-ID: <20240912190857.235849-33-david.kaplan@amd.com>
Date: Thu, 12 Sep 2024 14:08:55 -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 32/34] x86/bugs: Add attack vector controls for l1tf

Use attack vector controls to determine if l1tf mitigation is required.

Disable SMT if cross-thread attack vector option is selected.

Signed-off-by: David Kaplan <david.kaplan@....com>
---
 arch/x86/kernel/cpu/bugs.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 9c920e2b4f33..3be3431c20c0 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -2700,10 +2700,15 @@ static void __init l1tf_select_mitigation(void)
 	}
 
 	if (l1tf_mitigation == L1TF_MITIGATION_AUTO) {
-		if (cpu_mitigations_auto_nosmt())
-			l1tf_mitigation = L1TF_MITIGATION_FLUSH_NOSMT;
-		else
-			l1tf_mitigation = L1TF_MITIGATION_FLUSH;
+		if (!should_mitigate_vuln(L1TF))
+			l1tf_mitigation = L1TF_MITIGATION_OFF;
+		else {
+			if (cpu_mitigations_auto_nosmt() ||
+			    cpu_mitigate_attack_vector(CPU_MITIGATE_CROSS_THREAD))
+				l1tf_mitigation = L1TF_MITIGATION_FLUSH_NOSMT;
+			else
+				l1tf_mitigation = L1TF_MITIGATION_FLUSH;
+		}
 	}
 
 }
-- 
2.34.1