Re: [PATCH 6/6] arm64: errata: Add QCOM_KRYO_6XX_GOLD/PRIME to the spectre_bhb_k32_list

Hi,

On Mon, Dec 9, 2024 at 3:09 PM Dmitry Baryshkov
[off-list ref] wrote:

On Mon, Dec 09, 2024 at 09:43:16AM -0800, Douglas Anderson wrote:

quoted

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@chromium.org>
---
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)

Wow, all standard ARM cores. OK, I guess we can drop this patch too then. Nice!


-Doug