Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Received-SPF: Pass (protection.outlook.com: domain of arm.com designates
 63.35.35.123 as permitted sender) receiver=protection.outlook.com;
 client-ip=63.35.35.123; helo=64aa7808-outbound-1.mta.getcheckrecipient.com;
From:   Jianyong Wu <Jianyong.Wu@arm.com>
To:     Marc Zyngier <maz@kernel.org>
CC:     "netdev@vger.kernel.org" <netdev@vger.kernel.org>,
        "yangbo.lu@nxp.com" <yangbo.lu@nxp.com>,
        "john.stultz@linaro.org" <john.stultz@linaro.org>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "pbonzini@redhat.com" <pbonzini@redhat.com>,
        "sean.j.christopherson@intel.com" <sean.j.christopherson@intel.com>,
        "richardcochran@gmail.com" <richardcochran@gmail.com>,
        Mark Rutland <Mark.Rutland@arm.com>,
        "will@kernel.org" <will@kernel.org>,
        Suzuki Poulose <Suzuki.Poulose@arm.com>,
        Steven Price <Steven.Price@arm.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        Steve Capper <Steve.Capper@arm.com>,
        Kaly Xin <Kaly.Xin@arm.com>, Justin He <Justin.He@arm.com>,
        nd <nd@arm.com>,
        "kvm-owner@vger.kernel.org" <kvm-owner@vger.kernel.org>
Subject: RE: [RFC PATCH v9 7/8] ptp: arm64: Enable ptp_kvm for arm64
Thread-Topic: [RFC PATCH v9 7/8] ptp: arm64: Enable ptp_kvm for arm64
Thread-Index: AQHVrwu1ZTEnzkrQbEOo/hXDFqaU6affG9SAgALmpVCAADyUAIAABh4AgAGacqA=
Date:   Fri, 10 Jan 2020 10:15:58 +0000
Message-ID: <HE1PR0801MB16762CD153C2D598AD8C8E1BF4380@HE1PR0801MB1676.eurprd08.prod.outlook.com>
References: <20191210034026.45229-1-jianyong.wu@arm.com>
 <20191210034026.45229-8-jianyong.wu@arm.com>
 <ca162efb3a0de530e119f5237c006515@kernel.org>
 <HE1PR0801MB1676EE12CF0DB7C5BB8CC62DF4390@HE1PR0801MB1676.eurprd08.prod.outlook.com>
 <ee801dacbf4143e8d41807d5bfad1409@kernel.org>
 <a5f5fc5bf913c9a22923d1a556f511e6@kernel.org>
In-Reply-To: <a5f5fc5bf913c9a22923d1a556f511e6@kernel.org>
Accept-Language: en-US
Content-Language: en-US
Authentication-Results-Original: spf=none (sender IP is )
 smtp.mailfrom=Jianyong.Wu@arm.com; 
nodisclaimer: True
received-spf: None (protection.outlook.com: arm.com does not designate
 permitted sender hosts)
X-Microsoft-Antispam-Message-Info-Original: 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
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0801MB1883
Original-Authentication-Results: spf=none (sender IP is )
 smtp.mailfrom=Jianyong.Wu@arm.com; 
X-EOPAttributedMessage: 0
X-MS-Exchange-Transport-CrossTenantHeadersStripped: VE1EUR03FT021.eop-EUR03.prod.protection.outlook.com
X-Forefront-Antispam-Report: CIP:63.35.35.123;IPV:CAL;SCL:-1;CTRY:IE;EFV:NLI;SFV:NSPM;SFS:(10009020)(4636009)(346002)(136003)(376002)(39860400002)(396003)(199004)(189003)(13464003)(7696005)(9686003)(2906002)(70586007)(6862004)(8676002)(26826003)(86362001)(55016002)(450100002)(4326008)(70206006)(356004)(33656002)(81166006)(26005)(52536014)(5660300002)(81156014)(186003)(316002)(54906003)(336012)(53546011)(6506007)(478600001)(8936002);DIR:OUT;SFP:1101;SCL:1;SRVR:PR2PR08MB4921;H:64aa7808-outbound-1.mta.getcheckrecipient.com;FPR:;SPF:Pass;LANG:en;PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com;A:1;MX:1;
X-MS-Office365-Filtering-Correlation-Id-Prvs: 403b40da-4dc9-46dc-347e-08d795b61608
X-Forefront-PRVS: 02788FF38E
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info: 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
X-OriginatorOrg: arm.com
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jan 2020 10:16:06.6475
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: b977c6de-f75e-4985-282a-08d795b61b31
X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com]
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: PR2PR08MB4921
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hi Marc,

> -----Original Message-----
> From: Marc Zyngier <maz@kernel.org>
> Sent: Thursday, January 9, 2020 5:46 PM
> To: Jianyong Wu <Jianyong.Wu@arm.com>
> Cc: netdev@vger.kernel.org; yangbo.lu@nxp.com; john.stultz@linaro.org;
> tglx@linutronix.de; pbonzini@redhat.com; sean.j.christopherson@intel.com;
> richardcochran@gmail.com; Mark Rutland <Mark.Rutland@arm.com>;
> will@kernel.org; Suzuki Poulose <Suzuki.Poulose@arm.com>; Steven Price
> <Steven.Price@arm.com>; linux-kernel@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; kvmarm@lists.cs.columbia.edu;
> kvm@vger.kernel.org; Steve Capper <Steve.Capper@arm.com>; Kaly Xin
> <Kaly.Xin@arm.com>; Justin He <Justin.He@arm.com>; nd <nd@arm.com>;
> kvm-owner@vger.kernel.org
> Subject: Re: [RFC PATCH v9 7/8] ptp: arm64: Enable ptp_kvm for arm64
>=20
> On 2020-01-09 09:24, Marc Zyngier wrote:
> > On 2020-01-09 05:59, Jianyong Wu wrote:
>=20
> [...]
>=20
> >> 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).
>=20
> 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).
>=20
Get it

Thanks
Jianyong=20

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