linux-kernel - RE: [PATCH v15 6/9] arm64/kvm: Add hypercall service for kvm ptp.

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Date:   Tue, 24 Nov 2020 10:14:23 +0000
From:   Jianyong Wu <Jianyong.Wu@....com>
To:     Marc Zyngier <maz@...nel.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "yangbo.lu@....com" <yangbo.lu@....com>,
        "john.stultz@...aro.org" <john.stultz@...aro.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        Mark Rutland <Mark.Rutland@....com>,
        "will@...nel.org" <will@...nel.org>,
        Suzuki Poulose <Suzuki.Poulose@....com>,
        Andre Przywara <Andre.Przywara@....com>,
        Steven Price <Steven.Price@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Steve Capper <Steve.Capper@....com>,
        Justin He <Justin.He@....com>, nd <nd@....com>
Subject: RE: [PATCH v15 6/9] arm64/kvm: Add hypercall service for kvm ptp.

Hi Marc,

> -----Original Message-----
> From: Marc Zyngier <maz@...nel.org>
> Sent: Tuesday, November 24, 2020 5:07 PM
> To: Jianyong Wu <Jianyong.Wu@....com>
> Cc: netdev@...r.kernel.org; yangbo.lu@....com; john.stultz@...aro.org;
> tglx@...utronix.de; pbonzini@...hat.com; sean.j.christopherson@...el.com;
> richardcochran@...il.com; Mark Rutland <Mark.Rutland@....com>;
> will@...nel.org; Suzuki Poulose <Suzuki.Poulose@....com>; Andre
> Przywara <Andre.Przywara@....com>; Steven Price
> <Steven.Price@....com>; linux-kernel@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; kvmarm@...ts.cs.columbia.edu;
> kvm@...r.kernel.org; Steve Capper <Steve.Capper@....com>; Justin He
> <Justin.He@....com>; nd <nd@....com>
> Subject: Re: [PATCH v15 6/9] arm64/kvm: Add hypercall service for kvm ptp.
> 
> On 2020-11-24 05:20, Jianyong Wu wrote:
> > Hi Marc,
> 
> [...]
> 
> >> > +/* ptp_kvm counter type ID */
> >> > +#define ARM_PTP_VIRT_COUNTER			0
> >> > +#define ARM_PTP_PHY_COUNTER			1
> >> > +#define ARM_PTP_NONE_COUNTER			2
> >>
> >> The architecture definitely doesn't have this last counter.
> >
> > Yeah, this is just represent no counter data needed from guest.
> > Some annotation should be added here.
> 
> I'd rather you remove it entirely, or explain why you really cannot do without
> a fake counter.

OK, I will remove it.

Thanks
Jianyong
> 
>          M.
> --
> Jazz is not dead. It just smells funny...