linux-kernel - [PATCH 2/7] x86/cpu: Add Tremont to the cpu vulnerability whitelist

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Date:   Tue, 12 Nov 2019 22:21:32 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH 2/7] x86/cpu: Add Tremont to the cpu vulnerability whitelist

From: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>

Add the new cpu family ATOM_TREMONT_D to the cpu vunerability
whitelist. ATOM_TREMONT_D is not affected by X86_BUG_ITLB_MULTIHIT.

ATOM_TREMONT_D might have mitigations against other issues as well, but
only the ITLB multihit mitigation is confirmed at this point.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/cpu/common.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index d29b71ca3ca7..fffe21945374 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1074,6 +1074,8 @@ static void identify_cpu_without_cpuid(struct cpuinfo_x86 *c)
 	 * good enough for our purposes.
 	 */
 
+	VULNWL_INTEL(ATOM_TREMONT_D,		NO_ITLB_MULTIHIT),
+
 	/* AMD Family 0xf - 0x12 */
 	VULNWL_AMD(0x0f,	NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT),
 	VULNWL_AMD(0x10,	NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT),
-- 
1.8.3.1