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Date:   Mon, 30 Apr 2018 15:59:04 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Luwei Kang <luwei.kang@intel.com>
Cc:     kvm@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com,
        hpa@zytor.com, x86@kernel.org, pbonzini@redhat.com,
        rkrcmar@redhat.com, linux-kernel@vger.kernel.org, joro@8bytes.org,
        Chao Peng <chao.p.peng@linux.intel.com>
Subject: Re: [PATCH v6 02/11] perf/x86/intel/pt: Change pt_cap_get() to a
 public function
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On Tue, Mar 20, 2018 at 07:21:49PM +0800, Luwei Kang wrote:
> From: Chao Peng <chao.p.peng@linux.intel.com>
> 
> Change pt_cap_get() to a public function so that KVM can access it.
> Introduce new capablility PT_CAP_output_subsys to support
> of output to Trace Transport subsystem.

That is again, more than a single change.

Also, the Changelog is far too terse, why do you need a new capability?