linux-kernel - [PATCH 4/6] arm64: errata: Add QCOM_KRYO_3XX_GOLD to the spectre_bhb_firmware_mitigated

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Message-ID: <20241209094310.4.Ic6fdf0e43851269d10596da7e6ceae959431f9fa@changeid>
Date: Mon,  9 Dec 2024 09:43:14 -0800
From: Douglas Anderson <dianders@...omium.org>
To: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>
Cc: Julius Werner <jwerner@...omium.org>,
	Jeffrey Hugo <quic_jhugo@...cinc.com>,
	Roxana Bradescu <roxabee@...gle.com>,
	bjorn.andersson@....qualcomm.com,
	linux-arm-kernel@...ts.infradead.org,
	Trilok Soni <quic_tsoni@...cinc.com>,
	linux-arm-msm@...r.kernel.org,
	Douglas Anderson <dianders@...omium.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] arm64: errata: Add QCOM_KRYO_3XX_GOLD to the spectre_bhb_firmware_mitigated_list

Qualcomm Kryo 300-series Gold cores appear to have a derivative of an
ARM Cortex A75 in them. Since A75 needs Spectre mitigation then the
Kyro 300-series Gold cores also should need Spectre mitigation.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
I have no idea if this is actually needed and this patch is purely
speculative. Given that A75 needs some sort of Spectre mitigation it
seem hard to believe that the Qualcomm Kryo 300-series Gold cores
wouldn't need it.

NOTE: presumably this patch won't actually do much on its own because
(I believe) it requires a firmware update to go with it.

 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 0437be7c83bc..b1881964e304 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -926,6 +926,7 @@ static bool is_spectre_bhb_fw_affected(int scope)
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A75),
 		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_GOLD),
+		MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_GOLD),
 		{},
 	};
 	bool cpu_in_list = is_midr_in_range_list(read_cpuid_id(),
-- 
2.47.0.338.g60cca15819-goog