linux-kernel - Re: [PATCH v2] x86,sched: Update the Intel SNC CPU list that allows shared LLCs

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Date:   Wed, 24 Feb 2021 08:52:21 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Alison Schofield <alison.schofield@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        David Rientjes <rientjes@...gle.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Prarit Bhargava <prarit@...hat.com>, brice.goglin@...il.com
Subject: Re: [PATCH v2] x86,sched: Update the Intel SNC CPU list that allows
 shared LLCs

On 2/16/21 11:58 AM, Alison Schofield wrote:
>  arch/x86/kernel/smpboot.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index 02813a7f3a7c..de8c598dc3b9 100644
> --- a/arch/x86/kernel/smpboot.c
> +++ b/arch/x86/kernel/smpboot.c
> @@ -475,6 +475,8 @@ static bool match_smt(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
>  
>  static const struct x86_cpu_id snc_cpu[] = {
>  	X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_X, NULL),
> +	X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, NULL),
> +	X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, NULL),
>  	{}
>  };

Oh, and if this version gets picked up (or we go to a v3), it probably
also needs a:

Cc: stable@...r.kernel.org

This does cause scary warnings, and it would be nice to suppress those
on stable kernels too.