linux-kernel - RE: [PATCH v1 4/8] KVM: x86: Aviod clear the PEBS counter when PEBS enabled in guest

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Date:   Wed, 30 Oct 2019 04:06:42 +0000
From:   "Kang, Luwei" <luwei.kang@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "wanpengli@...cent.com" <wanpengli@...cent.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "thomas.lendacky@....com" <thomas.lendacky@....com>,
        "acme@...nel.org" <acme@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "jolsa@...hat.com" <jolsa@...hat.com>,
        "namhyung@...nel.org" <namhyung@...nel.org>
Subject: RE: [PATCH v1 4/8] KVM: x86: Aviod clear the PEBS counter when PEBS
 enabled in guest

> > This patch introduce a parameter that avoid clear the PEBS event
> > counter while running in the guest. The performance counter which use
> > for PEBS event can be enabled through VM-entry when PEBS is enabled in
> > guest by PEBS output to Intel PT.
> 
> Please write coherent Changelogs. I have no clue what you're trying to say.
> 
> Also, maybe this attrocious coding style is accepted in KVM, but I'm not having it. Pretty much all your linebreaks and subsequent
> indenting is against style.

Sorry. I mean the performance counter for PEBS event must be disabled before VM-entry at present. After PEBS enabled in guest by PEBS via PT, we don't need to disable the PEBS counters.
We be corrected in next version.

Thanks,
Luwei Kang