netdev - RE: [RFC PATCH v9 7/8] ptp: arm64: Enable ptp

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Message-ID: <HE1PR0801MB16762CD153C2D598AD8C8E1BF4380@HE1PR0801MB1676.eurprd08.prod.outlook.com>
Date:   Fri, 10 Jan 2020 10:15:58 +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>,
        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>,
        Kaly Xin <Kaly.Xin@....com>, Justin He <Justin.He@....com>,
        nd <nd@....com>,
        "kvm-owner@...r.kernel.org" <kvm-owner@...r.kernel.org>
Subject: RE: [RFC PATCH v9 7/8] ptp: arm64: Enable ptp_kvm for arm64

Hi Marc,

> -----Original Message-----
> From: Marc Zyngier <maz@...nel.org>
> Sent: Thursday, January 9, 2020 5:46 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>; 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>; Kaly Xin
> <Kaly.Xin@....com>; Justin He <Justin.He@....com>; nd <nd@....com>;
> kvm-owner@...r.kernel.org
> Subject: Re: [RFC PATCH v9 7/8] ptp: arm64: Enable ptp_kvm for arm64
> 
> On 2020-01-09 09:24, Marc Zyngier wrote:
> > On 2020-01-09 05:59, Jianyong Wu wrote:
> 
> [...]
> 
> >> So we focus it on arm64. Also I have never tested it on arm32 machine
> >> ( we lack of arm32 machine)
> >
> > I'm sure your employer can provide you with such a box. I can probably
> > even tell you which cupboard they are stored in... ;-)
> >
> >> Do you think it's necessary to enable ptp_kvm on arm32? If so, I can
> >> do that.
> >
> > I can't see why we wouldn't, given that it should be a zero effort
> > task (none of the code here is arch specific).
> 
> To be clear, what I'm after is support for 32bit *guests*. I don't expect any
> issue with a 32bit host (it's all common code), but you should be able to test
> 32bit guests pretty easily (most ARMv8.0 CPUs support 32bit EL1).
> 
Get it

Thanks
Jianyong 

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