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[v2,2/6] arm64: errata: Add KRYO 2XX/3XX/4XX silver cores to Spectre safe list

Message ID 20241213165201.v2.2.Iab8dbfb5c9b1e143e7a29f410bce5f9525a0ba32@changeid
State New
Headers show
Series arm64: errata: Rework Spectre BHB mitigations to not assume "safe" | expand

Commit Message

Doug Anderson Dec. 14, 2024, 12:52 a.m. UTC 
The 2XX cores appear to be based on ARM Cortex A53. The 3XX and 4XX
cores appear to be based on ARM Cortex A55. Both of those cores appear
to be "safe" from a Spectre point of view. While it would be nice to
get confirmation from Qualcomm, it seems hard to believe that they
made big enough changes to these cores to affect the Spectre BHB
vulnerability status. Add them to the safe list.


Fixes: 558c303c9734 ("arm64: Mitigate spectre style branch history side channels")
Cc: stable@vger.kernel.org
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

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 39c5573c7527..012485b75019 100644
--- a/arch/arm64/kernel/proton-pack.c
+++ b/arch/arm64/kernel/proton-pack.c
@@ -851,6 +851,9 @@  static const struct midr_range spectre_bhb_safe_list[] = {
 	MIDR_ALL_VERSIONS(MIDR_CORTEX_A35),
 	MIDR_ALL_VERSIONS(MIDR_CORTEX_A53),
 	MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
+	MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER),
+	MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER),
+	MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER),
 	{},
 };