linux-kernel - Re: [PATCH V3 2/3] KVM/Hyper-V: Add new KVM cap KVM_CAP_HYPERV_DIRECT

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Message-ID: <CAOLK0pxPKh3Gr8TVPqGernoHSTY=UyjwjqC4wEyR=Vo500ygFQ@mail.gmail.com>
Date:   Tue, 20 Aug 2019 20:38:11 +0800
From:   Tianyu Lan <lantianyu1986@...il.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>, corbet@....net,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        michael.h.kelley@...rosoft.com,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        kvm <kvm@...r.kernel.org>, linux-doc@...r.kernel.org,
        "linux-kernel@...r kernel org" <linux-kernel@...r.kernel.org>,
        linux-hyperv@...r.kernel.org,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH V3 2/3] KVM/Hyper-V: Add new KVM cap KVM_CAP_HYPERV_DIRECT_TLBFLUSH

Hi Thomas:
               Thanks for your review. Will fix your comment in the
next version.

On Mon, Aug 19, 2019 at 9:27 PM Thomas Gleixner <tglx@...utronix.de> wrote:
>
> On Mon, 19 Aug 2019, lantianyu1986@...il.com wrote:
>
> > From: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> >
> > This patch adds
>
> Same git grep command as before
>
> >  new KVM cap KVM_CAP_HYPERV_DIRECT_TLBFLUSH and let
>
> baseball cap? Please do not use weird acronyms. This is text and there is
> not limitation on characters.
>
> > user space to enable direct tlb flush function when only Hyper-V
> > hypervsior capability is exposed to VM.
>
> Sorry, but I'm not understanding this sentence.
>
> > This patch also adds
>
> Once more
>
> > enable_direct_tlbflush callback in the struct kvm_x86_ops and
> > platforms may use it to implement direct tlb flush support.
>
> Please tell in the changelog WHY you are doing things not what. The what is
> obviously in the patch.
>
> So you want to explain what you are trying to achieve and why it is
> useful. Then you can add a short note about what you are adding, but not at
> the level of detail which is available from the diff itself.
>
> Thanks,
>
>         tglx



--
Best regards
Tianyu Lan