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

Message ID 20250107120555.v4.3.Iab8dbfb5c9b1e143e7a29f410bce5f9525a0ba32@changeid (mailing list archive)
State New
Headers show
Series arm64: errata: Rework Spectre BHB mitigations to not assume "safe" | expand

Commit Message

Douglas Anderson Jan. 7, 2025, 8:06 p.m. UTC 
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@vger.kernel.org
Cc: Scott Bauer <sbauer@quicinc.com>
Signed-off-by: Douglas Anderson <dianders@chromium.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(+)
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Patch

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;