[PATCH v4 1/5] arm64: errata: Add QCOM_KRYO_4XX_GOLD to the spectre_bhb_k24_list
From: Douglas Anderson <dianders@chromium.org>
Date: 2025-01-07 20:08:10
Also in:
linux-arm-msm, lkml, stable
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
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@vger.kernel.org
Cc: Scott Bauer <redacted>
Signed-off-by: Douglas Anderson <dianders@chromium.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