linux-kernel - Re: [PATCH v5 2/5] KVM: x86: Add IBPB support

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Message-ID: <CALMp9eS25UwLM_ScfyuJ0BsUeLhM_cyfSQfFgJEQSdqFjVj-XQ@mail.gmail.com>
Date:   Wed, 31 Jan 2018 11:55:51 -0800
From:   Jim Mattson <jmattson@...gle.com>
To:     David Woodhouse <dwmw2@...radead.org>
Cc:     KarimAllah Ahmed <karahmed@...zon.de>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Ashok Raj <ashok.raj@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Andy Lutomirski <luto@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v5 2/5] KVM: x86: Add IBPB support

On Wed, Jan 31, 2018 at 11:53 AM, David Woodhouse <dwmw2@...radead.org> wrote:
> Rather than doing the expensive guest_cpu_has() every time (which is
> worse now as we realised we need two of them) perhaps we should
> introduce a local flag for that too?

That sounds good to me.