arm64: errata: Add QCOM_KRYO_4XX_GOLD to the spectre_bhb_k24_list

commit ed1ce841245d8febe3badf51c57e81c3619d0a1d upstream.

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 <sbauer@quicinc.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Trilok Soni <quic_tsoni@quicinc.com>
Link: https://lore.kernel.org/r/20250107120555.v4.1.Ie4ef54abe02e7eb0eee50f830575719bf23bda48@changeid
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
index 90337910c3f5332c6b1c35165f4878a6dde6abec..45fdfe70b69fca4a76d37e1354b3978d4e6285b1 100644 (file)
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -874,6 +874,7 @@ 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[] = {