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From: Andi Kleen <andi@firstfloor.org>
To: x86@kernel.org
Cc: linux-kernel@vger.kernel.org, Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 2/2] x86/spectre: Add missing family 6 check to microcode check
Date: Fri, 24 Aug 2018 10:03:51 -0700
Message-ID: <20180824170351.34874-2-andi@firstfloor.org> (raw)
In-Reply-To: <20180824170351.34874-1-andi@firstfloor.org>

From: Andi Kleen <ak@linux.intel.com>

The check for Spectre microcodes did not check for family 6,
only the model numbers. Add a family 6 check too just to
avoid ambiguity with other families.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 arch/x86/kernel/cpu/intel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c
index 401e8c133108..fc3c07fe7df5 100644
--- a/arch/x86/kernel/cpu/intel.c
+++ b/arch/x86/kernel/cpu/intel.c
@@ -150,6 +150,9 @@ static bool bad_spectre_microcode(struct cpuinfo_x86 *c)
 	if (cpu_has(c, X86_FEATURE_HYPERVISOR))
 		return false;
 
+	if (c->x86 != 6)
+		return false;
+
 	for (i = 0; i < ARRAY_SIZE(spectre_bad_microcodes); i++) {
 		if (c->x86_model == spectre_bad_microcodes[i].model &&
 		    c->x86_stepping == spectre_bad_microcodes[i].stepping)
-- 
2.17.1


  reply index

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-24 17:03 [PATCH 1/2] x86/speculation/l1tf: Increase l1tf memory limit for Nehalem+ Andi Kleen
2018-08-24 17:03 ` Andi Kleen [this message]
2018-08-27  8:34   ` [tip:x86/urgent] x86/spectre: Add missing family 6 check to microcode check tip-bot for Andi Kleen

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