linux-kernel - Re: [PATCH v4 3/5] arm64: errata: Add KRYO 2XX/3XX/4XX silver cores to Spectre BHB safe list

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Message-ID: <04adfe6c-5f04-4e28-a52d-b8cb5654771a@quicinc.com>
Date: Fri, 7 Feb 2025 14:57:30 -0800
From: Trilok Soni <quic_tsoni@...cinc.com>
To: Douglas Anderson <dianders@...omium.org>,
        Catalin Marinas
	<catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Mark Rutland
	<mark.rutland@....com>
CC: Roxana Bradescu <roxabee@...gle.com>,
        Julius Werner
	<jwerner@...omium.org>,
        <bjorn.andersson@....qualcomm.com>, <linux-arm-msm@...r.kernel.org>,
        Florian Fainelli
	<florian.fainelli@...adcom.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Jeffrey Hugo <quic_jhugo@...cinc.com>,
        Scott Bauer <sbauer@...cinc.com>, <stable@...r.kernel.org>,
        James Morse <james.morse@....com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/5] arm64: errata: Add KRYO 2XX/3XX/4XX silver cores
 to Spectre BHB safe list

On 1/7/2025 12:06 PM, Douglas Anderson wrote:
> Qualcomm has confirmed that, much like Cortex A53 and A55, KRYO
> 2XX/3XX/4XX silver cores are unaffected by Spectre BHB. Add them to
> the safe list.
> 
> 
> Fixes: 558c303c9734 ("arm64: Mitigate spectre style branch history side channels")
> Cc: stable@...r.kernel.org
> Cc: Scott Bauer <sbauer@...cinc.com>
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> 
> Changes in v4:
> - Re-added KRYO 2XX/3XX/4XX silver patch after Qualcomm confirmed.
> 
> Changes in v3:
> - Removed KRYO 2XX/3XX/4XX silver patch.
> 
> Changes in v2:
> - New
> 
>  arch/arm64/kernel/proton-pack.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
> index 17aa836fe46d..89405be53d8f 100644
> --- a/arch/arm64/kernel/proton-pack.c
> +++ b/arch/arm64/kernel/proton-pack.c
> @@ -854,6 +854,9 @@ static bool is_spectre_bhb_safe(int scope)
>  		MIDR_ALL_VERSIONS(MIDR_CORTEX_A510),
>  		MIDR_ALL_VERSIONS(MIDR_CORTEX_A520),
>  		MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53),
> +		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER),
> +		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER),
> +		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER),
>  		{},
>  	};
>  	static bool all_safe = true;

Acked-by: Trilok Soni <quic_tsoni@...cinc.com>

-- 
---Trilok Soni