linux-kernel - [PATCH v4 1/5] arm64: errata: Add QCOM_KRYO_4XX_GOLD to the spectre_bhb_k24

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Message-ID: <20250107120555.v4.1.Ie4ef54abe02e7eb0eee50f830575719bf23bda48@changeid>
Date: Tue,  7 Jan 2025 12:05:58 -0800
From: Douglas Anderson <dianders@...omium.org>
To: 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,
	Trilok Soni <quic_tsoni@...cinc.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>,
	Douglas Anderson <dianders@...omium.org>,
	stable@...r.kernel.org,
	James Morse <james.morse@....com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 1/5] arm64: errata: Add QCOM_KRYO_4XX_GOLD to the spectre_bhb_k24_list

Qualcomm Kryo 400-series Gold cores have a derivative of an ARM Cortex
A76 in them. Since A76 needs Spectre mitigation via looping then the
Kyro 400-series Gold cores also need Spectre mitigation via looping.

Qualcomm has confirmed that the proper "k" value for Kryo 400-series
Gold cores is 24.

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 QCOM_KRYO_4XX_GOLD k24 patch after Qualcomm confirmed.

Changes in v3:
- Removed QCOM_KRYO_4XX_GOLD k24 patch.

Changes in v2:
- Slight change to wording and notes of KRYO_4XX_GOLD patch

 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 da53722f95d4..e149efadff20 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -866,6 +866,7 @@ u8 spectre_bhb_loop_affected(int scope)
 			MIDR_ALL_VERSIONS(MIDR_CORTEX_A76),
 			MIDR_ALL_VERSIONS(MIDR_CORTEX_A77),
 			MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N1),
+			MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_GOLD),
 			{},
 		};
 		static const struct midr_range spectre_bhb_k11_list[] = {
-- 
2.47.1.613.gc27f4b7a9f-goog