linux-kernel - Re: [PATCH v3 2/4] KVM: x86: Add IBPB support

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Message-ID: <1517334188.18619.134.camel@infradead.org>
Date:   Tue, 30 Jan 2018 17:43:08 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Jim Mattson <jmattson@...gle.com>,
        KarimAllah Ahmed <karahmed@...zon.de>
Cc:     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 v3 2/4] KVM: x86: Add IBPB support

On Tue, 2018-01-30 at 09:19 -0800, Jim Mattson wrote:
> 
> Are you planning to allow L2 to write MSR_IA32_PRED_CMD without L0
> intercepting it, if the MSR write intercept is disabled in both the
> vmcs01 MSR permission bitmap and the vmcs12 MSR permission bitmap?

I don't see why we shouldn't.
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