linux-kernel - Re: [PATCH v1 0/4] Enable LBR for the guest

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Message-ID: <20170925145908.GN4311@tassilo.jf.intel.com>
Date:   Mon, 25 Sep 2017 07:59:08 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, pbonzini@...hat.com, mst@...hat.com,
        rkrcmar@...hat.com, mingo@...hat.com
Subject: Re: [PATCH v1 0/4] Enable LBR for the guest

On Mon, Sep 25, 2017 at 12:44:52PM +0800, Wei Wang wrote:
> This patch series enables the Last Branch Recording feature for the
> guest. Instead of trapping each LBR stack MSR access, the MSRs are
> passthroughed to the guest. Those MSRs are switched (i.e. load and
> saved) on VMExit and VMEntry.
> 
> Test:
> Try "perf record -b ./test_program" on guest.

I don't see where you expose the PERF capabilities MSR? 

That's normally needed for LBR too to report the version
number.

-Andi