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Date:   Wed, 3 Mar 2021 08:49:23 -0800
From:   Sean Christopherson <seanjc@google.com>
To:     Like Xu <like.xu@linux.intel.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        Wanpeng Li <wanpengli@tencent.com>,
        Jim Mattson <jmattson@google.com>,
        Joerg Roedel <joro@8bytes.org>,
        Kan Liang <kan.liang@linux.intel.com>,
        Dave Hansen <dave.hansen@intel.com>, wei.w.wang@intel.com,
        Borislav Petkov <bp@alien8.de>, kvm@vger.kernel.org,
        x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/9] perf/x86/intel: Fix a comment about guest LBR
 support
Message-ID: <YD++EyC0z2Vtu6uB@google.com>
References: <20210303135756.1546253-1-like.xu@linux.intel.com>
 <20210303135756.1546253-2-like.xu@linux.intel.com>
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On Wed, Mar 03, 2021, Like Xu wrote:
> Starting from v5.12, KVM reports guest LBR and extra_regs
> support when the host has relevant support.
> 
> Cc: Peter Zijlstra <peterz@infradead.org>
> Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
> Signed-off-by: Like Xu <like.xu@linux.intel.com>
> ---
>  arch/x86/events/intel/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
> index d4569bfa83e3..a32acc7733a7 100644
> --- a/arch/x86/events/intel/core.c
> +++ b/arch/x86/events/intel/core.c
> @@ -5565,7 +5565,7 @@ __init int intel_pmu_init(void)
>  
>  	/*
>  	 * Access LBR MSR may cause #GP under certain circumstances.
> -	 * E.g. KVM doesn't support LBR MSR
> +	 * E.g. KVM doesn't support LBR MSR before v5.12.

Just delete this part of the comment.

>  	 * Check all LBT MSR here.
>  	 * Disable LBR access if any LBR MSRs can not be accessed.
>  	 */
> -- 
> 2.29.2
>