linux-kernel - Re: [PATCH 2/5] KVM: svm: Disallow EFER.LMSLE on hardware that doesn't support it

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Message-ID: <YyT0G9y0RRyBDiPD@zn.tnic>
Date:   Sat, 17 Sep 2022 00:09:31 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Avi Kivity <avi@...hat.com>, Babu Moger <babu.moger@....com>,
        "Chang S. Bae" <chang.seok.bae@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Joerg Roedel <joerg.roedel@....com>,
        Josh Poimboeuf <jpoimboe@...nel.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wyes Karny <wyes.karny@....com>, x86@...nel.org
Subject: Re: [PATCH 2/5] KVM: svm: Disallow EFER.LMSLE on hardware that
 doesn't support it

On Fri, Sep 16, 2022 at 02:00:26PM -0700, Jim Mattson wrote:
> It's possible that SLES11 Xen 4.0 sets the bit, but never actually
> uses truncated segments in 64-bit mode. In any case, according to the
> original commit, it won't boot if setting EFER.LMSLE is not allowed.

How is SLE11 at all relevant to the upstream kernel?

-- 
Regards/Gruss,
    Boris.

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