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

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Subject: Re: [PATCH 2/5] KVM: svm: Disallow EFER.LMSLE on hardware that doesn't support it
From: Borislav Petkov <bp@xxxxxxxxx>
Date: Sat, 17 Sep 2022 00:09:31 +0200
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>, Avi Kivity <avi@xxxxxxxxxx>, Babu Moger <babu.moger@xxxxxxx>, "Chang S. Bae" <chang.seok.bae@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Joerg Roedel <joerg.roedel@xxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Wyes Karny <wyes.karny@xxxxxxx>, x86@xxxxxxxxxx
In-reply-to: <CALMp9eQXroxQYiWUCejd0Cj7kD5g5navWY_E2O_vzbVAQjLyNg@mail.gmail.com>
References: <20220916045832.461395-1-jmattson@google.com> <20220916045832.461395-3-jmattson@google.com> <YyTZFzaDOufASxqd@google.com> <CALMp9eQXroxQYiWUCejd0Cj7kD5g5navWY_E2O_vzbVAQjLyNg@mail.gmail.com>

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

Follow-Ups:
- Re: [PATCH 2/5] KVM: svm: Disallow EFER.LMSLE on hardware that doesn't support it
  - From: Sean Christopherson

References:
- [PATCH 0/5] KVM: EFER.LMSLE cleanup
  - From: Jim Mattson
- [PATCH 2/5] KVM: svm: Disallow EFER.LMSLE on hardware that doesn't support it
  - From: Jim Mattson
- Re: [PATCH 2/5] KVM: svm: Disallow EFER.LMSLE on hardware that doesn't support it
  - From: Sean Christopherson
- Re: [PATCH 2/5] KVM: svm: Disallow EFER.LMSLE on hardware that doesn't support it
  - From: Jim Mattson

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