From: "Liang, Kan" <kan.liang@intel.com>
To: Jidong Xiao <jidong.xiao@gmail.com>
CC: Peter Zijlstra <peterz@infradead.org>,
        Kernel development list <linux-kernel@vger.kernel.org>,
        KVM <kvm@vger.kernel.org>, "andi@firstfloor.org" <andi@firstfloor.org>,
        Andi Kleen <ak@linux.intel.com>
Subject: RE: [PATCH V2 1/3] perf ignore LBR and offcore_rsp.
Thread-Topic: [PATCH V2 1/3] perf ignore LBR and offcore_rsp.
Thread-Index: AQHPlmMa2+E29q6Tk0SWaq86jnLk6JuNGj0AgACZg9A=
Date: Thu, 3 Jul 2014 04:26:51 +0000
Message-ID: <37D7C6CF3E00A74B8858931C1DB2F077014BDCCD@SHSMSX103.ccr.corp.intel.com>
References: <1404324855-15166-1-git-send-email-kan.liang@intel.com>
 <CAG4AFWboxFM7g+RL+ACawOWATHnPxG0omnfgV4DZaVBu=BzDTg@mail.gmail.com>
In-Reply-To: <CAG4AFWboxFM7g+RL+ACawOWATHnPxG0omnfgV4DZaVBu=BzDTg@mail.gmail.com>
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> 
> On Wed, Jul 2, 2014 at 2:14 PM,  <kan.liang@intel.com> wrote:
> > From: Kan Liang <kan.liang@intel.com>
> >
> > x86, perf: Protect LBR and offcore rsp against KVM lying
> >
> > With -cpu host, KVM reports LBR and offcore support, if the host has
> support.
> > When the guest perf driver tries to access LBR or offcore_rsp MSR, it
> > #GPs all MSR accesses,since KVM doesn't handle LBR and offcore support.
> > So check the related MSRs access right once at initialization time to avoid
> the error access at runtime.
> >
> > For reproducing the issue, please build the kernel with
> CONFIG_KVM_INTEL = y.
> This is for host kernel,
> > And CONFIG_PARAVIRT = n and CONFIG_KVM_GUEST = n.
> And this is for guest kernel, right?
> 

Right.


> -Jidong
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