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(+)

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), {}, };