linux-kernel - Re: [tip:x86/pti] x86/spectre: Add boot time option to select Spectre v2 mitigation

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Message-ID: <alpine.DEB.2.20.1801101906080.1919@nanos>
Date:   Wed, 10 Jan 2018 19:06:27 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Tom Lendacky <thomas.lendacky@....com>
cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        tim.c.chen@...ux.intel.com, gregkh@...ux-foundation.org,
        hpa@...or.com, mingo@...nel.org, dwmw@...zon.co.uk,
        luto@...capital.net, riel@...hat.com, dave.hansen@...el.com,
        keescook@...gle.com, ak@...ux.intel.com, pjt@...gle.com,
        torvalds@...ux-foundation.org, jikos@...nel.org,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/pti] x86/spectre: Add boot time option to select Spectre
 v2 mitigation

On Wed, 10 Jan 2018, Tom Lendacky wrote:
> > +retpoline_auto:
> > +	if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD) {
> 
> Not specifying anything on the command line will get SPECTRE_V2_CMD_AUTO,
> so boot_cpu_has(X86_FEATURE_LFENCE_RDTSC) needs to be checked since it
> won't have been checked previously.

Dammit.