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Subject: Re: [PATCH v2 8/9] KVM, VMX: Add support for guest/host-only
 profiling
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Gleb Natapov <gleb@redhat.com>
Cc: linux-kernel@vger.kernel.org, avi@redhat.com, kvm@vger.kernel.org,
        joerg.roedel@amd.com, mingo@elte.hu
Date: Wed, 05 Oct 2011 16:19:39 +0200
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On Wed, 2011-10-05 at 14:01 +0200, Gleb Natapov wrote:
> +static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx)
> +{
> +       int i, nr_msrs;
> +       struct perf_guest_switch_msr *msrs;
> +
> +       msrs = perf_guest_get_msrs(&nr_msrs);
> +
> +       if (!msrs)
> +               return;
> +
> +       for (i = 0; i < nr_msrs; i++)
> +               if (msrs[i].host == msrs[i].guest)
> +                       clear_atomic_switch_msr(vmx, msrs[i].msr);
> +               else
> +                       add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest,
> +                                       msrs[i].host);
> +} 

I don't think this will actually compile with PERF_EVENTS=n due to
struct perf_guest_switch_msr not being defined.