On Mon, Dec 09, 2024 at 09:43:16AM -0800, Douglas Anderson wrote:
> Qualcomm Kryo 600-series Gold cores appear to have a derivative of an
> ARM Cortex A78 / ARM Cortex X1 in them. Since these need Spectre
> mitigation then the Kyro 600-series Gold/Prime cores also should need
> Spectre mitigation.
>
> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
> ---
> Yes. I know. This patch DOESN'T COMPILE because
> MIDR_QCOM_KRYO_6XX_GOLD and MIDR_QCOM_KRYO_6XX_PRIME are not
> defined. Those value needs to come from Qualcomm or from testing on
> hardware, which I don't have. Qualcomm needs to chime in to confirm
> that this Spectre mitigation is correct anyway, though. I'm including
> this patch so it's obvious that I think these cores also need the
> mitigation.
SM8350 (Kryo 680) identifies itself as 0x41/0xd44 (Prime), 0x41/0xd41
(Gold) and 0x41/0xd05 (Silver)
>
> arch/arm64/kernel/proton-pack.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm64/kernel/proton-pack.c b/arch/arm64/kernel/proton-pack.c
> index 212481726f04..67aa54017dea 100644
> --- a/arch/arm64/kernel/proton-pack.c
> +++ b/arch/arm64/kernel/proton-pack.c
> @@ -860,6 +860,8 @@ u8 spectre_bhb_loop_affected(int scope)
> MIDR_ALL_VERSIONS(MIDR_CORTEX_X2),
> MIDR_ALL_VERSIONS(MIDR_NEOVERSE_N2),
> MIDR_ALL_VERSIONS(MIDR_NEOVERSE_V1),
> + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_6XX_GOLD),
> + MIDR_ALL_VERSIONS(MIDR_QCOM_KRYO_6XX_PRIME),
> {},
> };
> static const struct midr_range spectre_bhb_k24_list[] = {
> --
> 2.47.0.338.g60cca15819-goog
>
--
With best wishes
Dmitry
