linux-kernel - Re: [PATCH] x86/retpoline: Fill RSB on context switch for affected CPUs

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Date:   Sun, 14 Jan 2018 12:39:14 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     David Woodhouse <dwmw@...zon.co.uk>
cc:     Andi Kleen <ak@...ux.intel.com>, Paul Turner <pjt@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Kees Cook <keescook@...gle.com>,
        Rik van Riel <riel@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...capital.net>,
        Jiri Kosina <jikos@...nel.org>, gnomes@...rguk.ukuu.org.uk,
        x86@...nel.org, thomas.lendacky@....com,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH] x86/retpoline: Fill RSB on context switch for affected
 CPUs

On Fri, 12 Jan 2018, David Woodhouse wrote:
> +/* Check for Skylake-like CPUs (for RSB handling) */
> +static bool __init is_skylake_era(void)
> +{
> +	if (boot_cpu_data.x86 == 6) {

This wants a checkfor vendor = intel 

> +		switch (boot_cpu_data.x86_model) {
> +		case INTEL_FAM6_SKYLAKE_MOBILE:
> +		case INTEL_FAM6_SKYLAKE_DESKTOP:
> +		case INTEL_FAM6_SKYLAKE_X:
> +		case INTEL_FAM6_KABYLAKE_MOBILE:
> +		case INTEL_FAM6_KABYLAKE_DESKTOP:
> +			return true;
> +		}
> +	}

Thanks,

	tglx