linux-kernel - [PATCH v1 2/2] x86/speculation/swapgs: Exclude Zhaoxin CPUs from SWAPGS

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Message-ID: <1579227872-26972-3-git-send-email-TonyWWang-oc@zhaoxin.com>
Date:   Fri, 17 Jan 2020 10:24:32 +0800
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <hpa@...or.com>, <x86@...nel.org>, <luto@...nel.org>,
        <pawan.kumar.gupta@...ux.intel.com>, <peterz@...radead.org>,
        <fenghua.yu@...el.com>, <vineela.tummalapalli@...el.com>,
        <linux-kernel@...r.kernel.org>
CC:     <DavidWang@...oxin.com>, <CooperYan@...oxin.com>,
        <QiyuanWang@...oxin.com>, <HerryYang@...oxin.com>
Subject: [PATCH v1 2/2] x86/speculation/swapgs: Exclude Zhaoxin CPUs from SWAPGS

New Zhaoxin family 7 CPUs are not affected by SWAPGS. So add these
CPUs to the cpu vulnerability whitelist.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
---
 arch/x86/kernel/cpu/common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 6048bd3..ca4a0d2 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1087,8 +1087,8 @@ static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = {
 	VULNWL_HYGON(X86_FAMILY_ANY,	NO_MELTDOWN | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT),
 
 	/* Zhaoxin Family 7 */
-	VULNWL(CENTAUR,	7, X86_MODEL_ANY,	NO_SPECTRE_V2),
-	VULNWL(ZHAOXIN,	7, X86_MODEL_ANY,	NO_SPECTRE_V2),
+	VULNWL(CENTAUR,	7, X86_MODEL_ANY,	NO_SPECTRE_V2 | NO_SWAPGS),
+	VULNWL(ZHAOXIN,	7, X86_MODEL_ANY,	NO_SPECTRE_V2 | NO_SWAPGS),
 	{}
 };
 
-- 
2.7.4