Commit 0c9fc6e6 authored by Douglas Anderson's avatar Douglas Anderson Committed by Catalin Marinas
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arm64: errata: Add KRYO 2XX/3XX/4XX silver cores to Spectre BHB safe list 



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: 558c303c ("arm64: Mitigate spectre style branch history side channels")
Cc: stable@vger.kernel.org
Cc: Scott Bauer <sbauer@quicinc.com>
Signed-off-by: default avatarDouglas Anderson <dianders@chromium.org>
Acked-by: default avatarTrilok Soni <quic_tsoni@quicinc.com>
Link: https://lore.kernel.org/r/20250107120555.v4.3.Iab8dbfb5c9b1e143e7a29f410bce5f9525a0ba32@changeid


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent e403e853

arch/arm64/kernel/proton-pack.c

+3 −0
Original line number Diff line number Diff line
@@ -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;