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[1/6] arm64: errata: Add QCOM_KRYO_4XX_GOLD to the spectre_bhb_k24_list

Message ID 20241209094310.1.Ie4ef54abe02e7eb0eee50f830575719bf23bda48@changeid (mailing list archive)
State Not Applicable
Headers show
Series arm64: errata: Add Qualcomm CPUs to the Spectre mitigation lists | expand

Commit Message

Doug Anderson Dec. 9, 2024, 5:43 p.m. UTC 
Qualcomm Kryo 400-series Gold cores appear to have a derivative of an
ARM Cortex A76 in them. Since A76 needs Spectre mitigation then the
Kyro 400-series Gold cores also should need Spectre mitigation.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
---
The "k" value here really should come from analysis by Qualcomm, but
until we can get that analysis let's choose the same value as A76: 24.

Ideally someone from Qualcomm can confirm that this mitigation is
needed and confirm / provide the proper "k" value.

 arch/arm64/kernel/proton-pack.c | 1 +
 1 file changed, 1 insertion(+)
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Patch

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[] = {