linux-kernel - RE: [PATCH v9 04/12] perf/x86/intel/pt: add new capability for Intel PT

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Date:   Fri, 8 Jun 2018 14:37:41 +0000
From:   "Kang, Luwei" <luwei.kang@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "bp@...e.de" <bp@...e.de>, "Liang, Kan" <kan.liang@...el.com>,
        "Janakarajan.Natarajan@....com" <Janakarajan.Natarajan@....com>,
        "dwmw@...zon.co.uk" <dwmw@...zon.co.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>,
        "kstewart@...uxfoundation.org" <kstewart@...uxfoundation.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "david@...hat.com" <david@...hat.com>,
        "bsd@...hat.com" <bsd@...hat.com>,
        "yu.c.zhang@...ux.intel.com" <yu.c.zhang@...ux.intel.com>,
        "joro@...tes.org" <joro@...tes.org>
Subject: RE: [PATCH v9 04/12] perf/x86/intel/pt: add new capability for
 Intel PT

> > On Tue, May 22, 2018 at 12:52:07PM +0800, Luwei Kang wrote:
> > > CPUID(EAX=14H,ECX=0):EBX[bit 3] = 1 indicates support of output to
> > > Trace Transport subsystem.
> > > MSR IA32_RTIT_CTL.FabricEn[bit 6] is reserved if CPUID.(EAX=14H,
> > > ECX=0):ECX[bit 3] = 0.
> >
> > This should instead say:
> >
> > This adds support for "output to Trace Transport subsystem" capability
> > of Intel PT, as documented in IA SDM Chapter 36.x.y.z. It means that
> > PT can output its trace to an MMIO address range rather than system
> > memory buffer.
> 
> The $subject also needs attention.

A little don't understand. What is "$subject" mean?

Thanks,
Luwei Kang