linux-kernel - Re: [PATCH] x86/CPU/AMD: Make sure EFER[AIBRSE] is set

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Message-ID: <Y/uoeZKMxAgqU5eR@zn.tnic>
Date:   Sun, 26 Feb 2023 19:44:09 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Josh Poimboeuf <jpoimboe@...nel.org>
Cc:     Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Kim Phillips <kim.phillips@....com>, 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>,
        Tom Lendacky <thomas.lendacky@....com>,
        Alexey Kardashevskiy <aik@....com>, kvm@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/CPU/AMD: Make sure EFER[AIBRSE] is set

On Sun, Feb 26, 2023 at 09:27:26AM -0800, Josh Poimboeuf wrote:
> At least now it's a (mostly) self-contained hornets nest.  I'm not sure
> we want to poke it :-)
> 
> And I'm not sure spreading the mess around would be an improvement.

Yah, if anything, I wanna see the change first and it has to be an
obvious and good one.

What I think we should finish doing, though, is documenting it. Because
there are aspects/mitigations that are missing, e.g., there's no
retbleed.rst in Documentation/admin-guide/hw-vuln/

-- 
Regards/Gruss,
    Boris.

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