linux-kernel - Re: [PATCH 2/3] x86/speculation: Support Automatic IBRS

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Message-ID: <Y2WJjdY3wwQl9/q9@zn.tnic>
Date:   Fri, 4 Nov 2022 22:52:13 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Kim Phillips <kim.phillips@....com>
Cc:     x86@...nel.org, Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Joao Martins <joao.m.martins@...cle.com>,
        Jonathan Corbet <corbet@....net>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        David Woodhouse <dwmw@...zon.co.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Juergen Gross <jgross@...e.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Tony Luck <tony.luck@...el.com>,
        Babu Moger <Babu.Moger@....com>,
        Tom Lendacky <thomas.lendacky@....com>, kvm@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] x86/speculation: Support Automatic IBRS

On Fri, Nov 04, 2022 at 04:36:50PM -0500, Kim Phillips wrote:
>  - Allow for spectre_v2=autoibrs in the kernel command line,
>    reverting to auto-selection if the feature isn't available.

Why?

What the whole logic here should do is enable autoibrs when detected
automatically, without the need for the user to even select it as it is
the superior mitigation.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette