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

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Date:   Tue, 26 Sep 2017 09:51:37 -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 the other side, it seems that the (guest) kernel driver also works
> without
> the above being supported, should we change it to report error and stop
> using the PMU features when the check of the above two fails (at
> intel_pmu_init())?

You could add the extra check for the LBR code yes, although it already checks
if the LBR MSRs work, so in practice it's likely already covered.

-Andi