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

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Message-ID: <20250107120555.v4.3.Iab8dbfb5c9b1e143e7a29f410bce5f9525a0ba32@changeid>
Date: Tue,  7 Jan 2025 12:06:00 -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 3/5] 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: 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;
-- 
2.47.1.613.gc27f4b7a9f-goog