linux-kernel - Re: [PATCH 9/8] KVM: x86: limit MSR_IA32_SPEC

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Message-ID: <CALMp9eTfCtkmTjtPVb5EV0gZY38Uu=2YAN5R6_Ef0Sast7qX8g@mail.gmail.com>
Date:   Tue, 9 Jan 2018 08:40:50 -0800
From:   Jim Mattson <jmattson@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Liran Alon <liran.alon@...cle.com>,
        "the arch/x86 maintainers" <x86@...nel.org>, dwmw@...zon.co.uk,
        bp@...en8.de, aliguori@...zon.com,
        Tom Lendacky <thomas.lendacky@....com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>
Subject: Re: [PATCH 9/8] KVM: x86: limit MSR_IA32_SPEC_CTRL access based on
 CPUID availability

I'm going to try to get per-vCPU MSR bitmaps out today or tomorrow.

On Tue, Jan 9, 2018 at 8:11 AM, Paolo Bonzini <pbonzini@...hat.com> wrote:
> On 09/01/2018 16:58, Liran Alon wrote:
>>
>> The only thing I a bit dislike is that currently these MSRs are always pass-through to guest and therefore
>> there is no case vmx_set_msr() is called with !msr_info->host_initiated.
>> Don't you think we should BUG_ON(!msr_info->host_initiated)?
>
> All this is in flux.  We'll probably get per-VCPU MSR bitmaps anyway
> before this patch (which is not part of the initial, minimal fix) is
> committed.
>
> Paolo
>