linux-kernel - Re: [PATCH 07/16] KVM: VMX: Use VMX feature flag to query BIOS enabling

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Message-ID: <CALMp9eRDxHAAbtvdUZyM2VyKiKhRxftW+zbmGANF6Y6qADK9_g@mail.gmail.com>
Date:   Fri, 4 Oct 2019 16:26:55 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Tony Luck <tony.luck@...el.com>,
        Tony W Wang-oc <TonyWWang-oc@...oxin.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>, linux-edac@...r.kernel.org,
        Borislav Petkov <bp@...e.de>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Subject: Re: [PATCH 07/16] KVM: VMX: Use VMX feature flag to query BIOS enabling

On Fri, Oct 4, 2019 at 2:56 PM Sean Christopherson
<sean.j.christopherson@...el.com> wrote:
>
> Replace KVM's manual checks on IA32_FEATURE_CONTROL with a query on the
> boot CPU's VMX feature flag.  The VMX flag is now cleared during boot if
> VMX isn't fully enabled via IA32_FEATURE_CONTROL, including the case
> where IA32_FEATURE_CONTROL isn't supported.
>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
Reviewed-by: Jim Mattson <jmattson@...gle.com>