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Message-ID: <20241105215455.359471-31-david.kaplan@amd.com>
Date: Tue, 5 Nov 2024 15:54:50 -0600
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: [PATCH v2 30/35] x86/bugs: Add attack vector controls for spectre_v2_user
Use attack vector controls to determine if spectre_v2_user mitigation is
required.
Signed-off-by: David Kaplan <david.kaplan@....com>
---
arch/x86/kernel/cpu/bugs.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 545151114947..6479c800e973 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1548,6 +1548,13 @@ spectre_v2_user_select_mitigation(void)
spectre_v2_user_stibp = SPECTRE_V2_USER_STRICT;
break;
case SPECTRE_V2_USER_CMD_AUTO:
+ if (should_mitigate_vuln(X86_BUG_SPECTRE_V2_USER)) {
+ spectre_v2_user_ibpb = SPECTRE_V2_USER_PRCTL;
+ spectre_v2_user_stibp = SPECTRE_V2_USER_PRCTL;
+ } else {
+ return;
+ }
+ break;
case SPECTRE_V2_USER_CMD_PRCTL:
spectre_v2_user_ibpb = SPECTRE_V2_USER_PRCTL;
spectre_v2_user_stibp = SPECTRE_V2_USER_PRCTL;
--
2.34.1
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