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@huawei.com>
Link: https://lore.kernel.org/r/20250325141900.2057314-1-yangjinqian1@huawei.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index 20284bf34722ea03a5fa4191b4bfb5b27c5bad0a..3530887daddb526f094daafbae5413d4615f7ebd 100644 (file)
--- a/arch/arm64/include/asm/cputype.h
+++ b/arch/arm64/include/asm/cputype.h
@@ -132,6 +132,7 @@
 #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
@@ -218,6 +219,7 @@
 #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 0f51fd10b4b06327381ac50a606e6d5871b1d426..aaf6578c39ac4d320a9e8c862b382038430f86b2 100644 (file)
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -901,6 +901,7 @@ static u8 spectre_bhb_loop_affected(void)
                MIDR_ALL_VERSIONS(MIDR_CORTEX_A77),
                MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N1),
                MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_GOLD),
+               MIDR_ALL_VERSIONS(MIDR_HISI_HIP09),
                {},
        };
        static const struct midr_range spectre_bhb_k11_list[] = {