linux-kernel - [PATCH] arm64: Add support for HIP09 Spectre-BHB mitigation

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Message-ID: <20250325141900.2057314-1-yangjinqian1@huawei.com>
Date: Tue, 25 Mar 2025 22:19:00 +0800
From: Jinqian Yang <yangjinqian1@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <mark.rutland@....com>,
	<oliver.upton@...ux.dev>, <maz@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<wangzhou1@...ilicon.com>, <shameerali.kolothum.thodi@...wei.com>,
	<liuyonglong@...wei.com>, <jiangkunkun@...wei.com>,
	<yangjinqian1@...wei.comm>, <xueshan2@...wei.com>, Jinqian Yang
	<yangjinqian1@...wei.com>
Subject: [PATCH] arm64: Add support for HIP09 Spectre-BHB mitigation

The HIP09 processor is vulnerable to the Spectre-BHB (Branch History
Buffer) attack, which can be exploited to leak information through
branch prediction side channels. This commit adds the MIDR of HIP09
to the list for software mitigation.

Signed-off-by: Jinqian Yang <yangjinqian1@...wei.com>
---
 arch/arm64/include/asm/cputype.h | 2 ++
 arch/arm64/kernel/proton-pack.c  | 1 +
 2 files changed, 3 insertions(+)

diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index 6f3f4142e214..363a9cbe780e 100644
--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -130,6 +130,7 @@
 #define FUJITSU_CPU_PART_A64FX		0x001
 
 #define HISI_CPU_PART_TSV110		0xD01
+#define HISI_CPU_PART_HIP09			0xD02
 
 #define APPLE_CPU_PART_M1_ICESTORM	0x022
 #define APPLE_CPU_PART_M1_FIRESTORM	0x023
@@ -204,6 +205,7 @@
 #define MIDR_NVIDIA_CARMEL MIDR_CPU_MODEL(ARM_CPU_IMP_NVIDIA, NVIDIA_CPU_PART_CARMEL)
 #define MIDR_FUJITSU_A64FX MIDR_CPU_MODEL(ARM_CPU_IMP_FUJITSU, FUJITSU_CPU_PART_A64FX)
 #define MIDR_HISI_TSV110 MIDR_CPU_MODEL(ARM_CPU_IMP_HISI, HISI_CPU_PART_TSV110)
+#define MIDR_HISI_HIP09 MIDR_CPU_MODEL(ARM_CPU_IMP_HISI, HISI_CPU_PART_HIP09)
 #define MIDR_APPLE_M1_ICESTORM MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_ICESTORM)
 #define MIDR_APPLE_M1_FIRESTORM MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_FIRESTORM)
 #define MIDR_APPLE_M1_ICESTORM_PRO MIDR_CPU_MODEL(ARM_CPU_IMP_APPLE, APPLE_CPU_PART_M1_ICESTORM_PRO)
diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index da53722f95d4..98bb7251a184 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -866,6 +866,7 @@ u8 spectre_bhb_loop_affected(int scope)
 			MIDR_ALL_VERSIONS(MIDR_CORTEX_A76),
 			MIDR_ALL_VERSIONS(MIDR_CORTEX_A77),
 			MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N1),
+			MIDR_ALL_VERSIONS(MIDR_HISI_HIP09),
 			{},
 		};
 		static const struct midr_range spectre_bhb_k11_list[] = {
-- 
2.33.0