linux-kernel - [PATCH] arm64: Add support for TSV110 Spectre-BHB mitigation

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Message-ID: <20251227092448.732059-1-yangjinqian1@huawei.com>
Date: Sat, 27 Dec 2025 17:24:48 +0800
From: Jinqian Yang <yangjinqian1@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>
CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<wangzhou1@...ilicon.com>, <shenjian15@...wei.com>, <linuxarm@...wei.com>,
	Jinqian Yang <yangjinqian1@...wei.com>
Subject: [PATCH] arm64: Add support for TSV110 Spectre-BHB mitigation

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@...wei.com>
---
 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 80a580e019c5..b3801f532b10 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[] = {
-- 
2.33.0