| Message ID | 20250107120555.v4.3.Iab8dbfb5c9b1e143e7a29f410bce5f9525a0ba32@changeid (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | arm64: errata: Rework Spectre BHB mitigations to not assume "safe" | expand |
On 1/7/2025 12:06 PM, Douglas Anderson wrote: > Qualcomm has confirmed that, much like Cortex A53 and A55, KRYO > 2XX/3XX/4XX silver cores are unaffected by Spectre BHB. Add them to > the safe list. > > > 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> > --- > > Changes in v4: > - Re-added KRYO 2XX/3XX/4XX silver patch after Qualcomm confirmed. > > Changes in v3: > - Removed KRYO 2XX/3XX/4XX silver patch. > > Changes in v2: > - New > > arch/arm64/kernel/proton-pack.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c > index 17aa836fe46d..89405be53d8f 100644 > --- a/arch/arm64/kernel/proton-pack.c > +++ b/arch/arm64/kernel/proton-pack.c > @@ -854,6 +854,9 @@ static bool is_spectre_bhb_safe(int scope) > MIDR_ALL_VERSIONS(MIDR_CORTEX_A510), > MIDR_ALL_VERSIONS(MIDR_CORTEX_A520), > MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), > + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER), > + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER), > + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER), > {}, > }; > static bool all_safe = true; Acked-by: Trilok Soni <quic_tsoni@quicinc.com>
diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c index 17aa836fe46d..89405be53d8f 100644 --- a/arch/arm64/kernel/proton-pack.c +++ b/arch/arm64/kernel/proton-pack.c @@ -854,6 +854,9 @@ static bool is_spectre_bhb_safe(int scope) MIDR_ALL_VERSIONS(MIDR_CORTEX_A510), MIDR_ALL_VERSIONS(MIDR_CORTEX_A520), MIDR_ALL_VERSIONS(MIDR_BRAHMA_B53), + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_2XX_SILVER), + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_3XX_SILVER), + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_4XX_SILVER), {}, }; static bool all_safe = true;
Qualcomm has confirmed that, much like Cortex A53 and A55, KRYO 2XX/3XX/4XX silver cores are unaffected by Spectre BHB. Add them to the safe list. 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> --- Changes in v4: - Re-added KRYO 2XX/3XX/4XX silver patch after Qualcomm confirmed. Changes in v3: - Removed KRYO 2XX/3XX/4XX silver patch. Changes in v2: - New arch/arm64/kernel/proton-pack.c | 3 +++ 1 file changed, 3 insertions(+)