[PATCH 6.18 047/752] arm64: Add support for TSV110 Spectre-BHB mitigation

Sasha Levin
2026-02-28T17:48:48Z

From: Jinqian Yang <yangjinqian1@huawei.com>

[ Upstream commit e3baa5d4b361276efeb87b20d8beced451a7dbd5 ]

The TSV110 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 TSV110
to the list for software mitigation.

Signed-off-by: Jinqian Yang <yangjinqian1@huawei.com>
Reviewed-by: Zenghui Yu <zenghui.yu@linux.dev>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm64/kernel/proton-pack.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index 80a580e019c50..b3801f532b10b 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -887,6 +887,7 @@ static u8 spectre_bhb_loop_affected(void)
MIDR_ALL_VERSIONS(MIDR_CORTEX_X2),
MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N2),
MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V1),
+ MIDR_ALL_VERSIONS(MIDR_HISI_TSV110),
{},
};
static const struct midr_range spectre_bhb_k24_list[] = {
--
2.51.0