linux-kernel - Re: [PATCH] x86: Report Intel platform

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Message-ID: <alpine.DEB.2.20.1609211425080.5573@nanos>
Date:   Wed, 21 Sep 2016 14:30:32 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andi Kleen <andi@...stfloor.org>
cc:     x86@...nel.org, LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>, hmh@....eng.br, bp@...en8.de
Subject: Re: [PATCH] x86: Report Intel platform_id in /proc/cpuinfo

On Thu, 2 Jun 2016, Andi Kleen wrote:

Sorry for answering late. This got stuck in my backlog forever.

> diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
> index ee81c54..bcd3f59 100644
> --- a/arch/x86/kernel/cpu/microcode/intel.c
> +++ b/arch/x86/kernel/cpu/microcode/intel.c
> @@ -812,6 +812,8 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
>  		/* get processor flags from MSR 0x17 */
>  		rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
>  		csig->pf = 1 << ((val[1] >> 18) & 7);
> +		cpu_data(cpu_num).platform_id = (val[1] >> 18) & 7;
> +		cpu_data(cpu_num).has_platform_id = true;

Please move that evaluation to arch/x86/kernel/cpu/intel.c and let the
micro code driver use the information from cpu_data.

Thanks,

	tglx