arm64: Add support for TSV110 Spectre-BHB mitigation

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

Posted by Jinqian Yang 1 month, 1 week ago

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>
---
 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

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

Posted by Will Deacon 1 month ago

On Sat, 27 Dec 2025 17:24:48 +0800, Jinqian Yang wrote:
> 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.
> 
> 

Applied to arm64 (for-next/cpufeature), thanks!

[1/1] arm64: Add support for TSV110 Spectre-BHB mitigation
      https://git.kernel.org/arm64/c/e3baa5d4b361

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev

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

Posted by Zenghui Yu 1 month, 1 week ago

On 2025/12/27 17:24, Jinqian Yang wrote:
> 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>
> ---
>  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[] = {

Looks good, thanks!

Reviewed-by: Zenghui Yu <zenghui.yu@linux.dev>

Zenghui