linux-kernel - [tip: x86/bugs] x86/srso: Fix SBPB enablement for (possible) future fixed HW

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Message-ID: <169295877386.27769.6870799365649352535.tip-bot2@tip-bot2>
Date:   Fri, 25 Aug 2023 10:19:33 -0000
From:   "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Josh Poimboeuf <jpoimboe@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/bugs] x86/srso: Fix SBPB enablement for (possible) future fixed HW

The following commit has been merged into the x86/bugs branch of tip:

Commit-ID:     71278e8405530b12feb55dc3ef71ed045056950c
Gitweb:        https://git.kernel.org/tip/71278e8405530b12feb55dc3ef71ed045056950c
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Fri, 25 Aug 2023 00:01:38 -07:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 25 Aug 2023 11:21:59 +02:00

x86/srso: Fix SBPB enablement for (possible) future fixed HW

Make the SBPB check more robust against the (possible) case where future
HW has SRSO fixed but doesn't have the SRSO_NO bit set.

Fixes: 1b5277c0ea0b ("x86/srso: Add SRSO_NO support")
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Link: https://lore.kernel.org/r/d04e617b39eefdb0221857d53858579acdc3f580.1692919072.git.jpoimboe@kernel.org
---
 arch/x86/kernel/cpu/bugs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 10499bc..2859a54 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -2496,7 +2496,7 @@ static void __init srso_select_mitigation(void)
 	pr_info("%s%s\n", srso_strings[srso_mitigation], (has_microcode ? "" : ", no microcode"));
 
 pred_cmd:
-	if ((boot_cpu_has(X86_FEATURE_SRSO_NO) || srso_cmd == SRSO_CMD_OFF) &&
+	if ((!boot_cpu_has_bug(X86_BUG_SRSO) || srso_cmd == SRSO_CMD_OFF) &&
 	     boot_cpu_has(X86_FEATURE_SBPB))
 		x86_pred_cmd = PRED_CMD_SBPB;
 }