linux-kernel - Re: [PATCH 6/6] arm64: errata: Add QCOM_KRYO_6XX_GOLD/PRIME to the spectre_bhb_k32

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Message-ID: <CAD=FV=XxL=HjA8pgpQjY8AQAkJns3H0BMV8nO9jKUxiuu2vKqA@mail.gmail.com>
Date: Fri, 13 Dec 2024 16:53:34 -0800
From: Doug Anderson <dianders@...omium.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, Julius Werner <jwerner@...omium.org>, 
	Jeffrey Hugo <quic_jhugo@...cinc.com>, Roxana Bradescu <roxabee@...gle.com>, 
	bjorn.andersson@....qualcomm.com, linux-arm-kernel@...ts.infradead.org, 
	Trilok Soni <quic_tsoni@...cinc.com>, linux-arm-msm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: 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
<dmitry.baryshkov@...aro.org> wrote:
>
> 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@...omium.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