5.15-stable review patch. If anyone has any objections, please let me know.
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From: Douglas Anderson dianders@chromium.org
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.Ie4ef54abe02e7eb0eee50f8305757... Signed-off-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm64/kernel/proton-pack.c | 1 + 1 file changed, 1 insertion(+)
--- 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[] = {