linux-kernel - Re: [PATCH] KVM: X86: Fix MSR range of APIC registers in X2APIC mode

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Date:   Tue, 16 Jun 2020 09:41:30 -0700
From:   Jim Mattson <jmattson@...gle.com>
To:     Sean Christopherson <sean.j.christopherson@...el.com>
Cc:     Xiaoyao Li <xiaoyao.li@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        kvm list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] KVM: X86: Fix MSR range of APIC registers in X2APIC mode

On Tue, Jun 16, 2020 at 1:20 AM Sean Christopherson
<sean.j.christopherson@...el.com> wrote:
>
> On Tue, Jun 16, 2020 at 03:33:07PM +0800, Xiaoyao Li wrote:
> > Only MSR address range 0x800 through 0x8ff is architecturally reserved
> > and dedicated for accessing APIC registers in x2APIC mode.
> >
> > Fixes: 0105d1a52640 ("KVM: x2apic interface to lapic")
> > Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
> > ---
>
> And perhaps more importantly, there are real MSRs that are overlapped,
> e.g. MSR_IA32_TME_ACTIVATE.  This probably warrants a Cc to stable; as you
> found out the hard way, this breaks ignore_msrs.
>
> Reviewed-by: Sean Christopherson <sean.j.christopherson@...el.com>

Excellent find!

Reviewed-by: Jim Mattson <jmattson@...gle.com>