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Wed, 9 Oct 2019 05:21:14 +0000 From: "Jianyong Wu (Arm Technology China)" To: Paolo Bonzini , Marc Zyngier , "netdev@vger.kernel.org" , "yangbo.lu@nxp.com" , "john.stultz@linaro.org" , "tglx@linutronix.de" , "sean.j.christopherson@intel.com" , "richardcochran@gmail.com" , Mark Rutland , Will Deacon , Suzuki Poulose CC: "linux-kernel@vger.kernel.org" , "kvm@vger.kernel.org" , Steve Capper , "Kaly Xin (Arm Technology China)" , "Justin He (Arm Technology China)" , nd , "linux-arm-kernel@lists.infradead.org" Subject: RE: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm. Thread-Topic: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm. Thread-Index: AQHVbfg5HjMQ+p5UhEyfzqBy9sDEZacxGVuAgAAQMICAABDUgIABdZhAgAAo7ACAAAjcAIAACYiAgB7418A= Date: Wed, 9 Oct 2019 05:21:13 +0000 Message-ID: References: <20190918080716.64242-1-jianyong.wu@arm.com> <20190918080716.64242-5-jianyong.wu@arm.com> <83ed7fac-277f-a31e-af37-8ec134f39d26@redhat.com> <629538ea-13fb-e666-8df6-8ad23f114755@redhat.com> <56a5b885-62c8-c4ef-e2f8-e945c0eb700e@redhat.com> In-Reply-To: <56a5b885-62c8-c4ef-e2f8-e945c0eb700e@redhat.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ts-tracking-id: 0332c8ce-b1c2-4bf0-a0fd-3e5ad07cc41a.1 x-checkrecipientchecked: true Authentication-Results-Original: spf=none (sender IP is ) smtp.mailfrom=Jianyong.Wu@arm.com; x-originating-ip: [113.29.88.7] x-ms-publictraffictype: Email X-MS-Office365-Filtering-Correlation-Id: b8dd3777-847b-4178-d418-08d74c788896 X-MS-Office365-Filtering-HT: Tenant X-MS-TrafficTypeDiagnostic: HE1PR0801MB2091:|HE1PR0801MB2091:|AM6PR08MB4342: x-ms-exchange-transport-forked: True X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true x-ms-oob-tlc-oobclassifiers: OLM:6430;OLM:6430; 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Wed, 9 Oct 2019 05:21:14 +0000 From: "Jianyong Wu (Arm Technology China)" To: Paolo Bonzini , Marc Zyngier , "netdev@vger.kernel.org" , "yangbo.lu@nxp.com" , "john.stultz@linaro.org" , "tglx@linutronix.de" , "sean.j.christopherson@intel.com" , "richardcochran@gmail.com" , Mark Rutland , Will Deacon , Suzuki Poulose Subject: RE: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm. Thread-Topic: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm. 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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB2976 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191008_222141_969925_2B6ED4BC X-CRM114-Status: GOOD ( 12.75 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Justin He \(Arm Technology China\)" , "kvm@vger.kernel.org" , Steve Capper , "linux-kernel@vger.kernel.org" , "Kaly Xin \(Arm Technology China\)" , nd , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Paolo, > -----Original Message----- > From: Paolo Bonzini > Sent: Thursday, September 19, 2019 8:13 PM > To: Marc Zyngier ; Jianyong Wu (Arm Technology China) > ; netdev@vger.kernel.org; yangbo.lu@nxp.com; > john.stultz@linaro.org; tglx@linutronix.de; sean.j.christopherson@intel.com; > richardcochran@gmail.com; Mark Rutland ; Will > Deacon ; Suzuki Poulose > > Cc: linux-kernel@vger.kernel.org; kvm@vger.kernel.org; Steve Capper > ; Kaly Xin (Arm Technology China) > ; Justin He (Arm Technology China) > ; nd ; linux-arm- > kernel@lists.infradead.org > Subject: Re: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm. > > On 19/09/19 13:39, Marc Zyngier wrote: > >> I don't think it's ugly but more important, using tk->tkr_mono.clock > >> is incorrect. See how the x86 code hardcodes &kvm_clock, it's the > >> same for ARM. > > Not really. The guest kernel is free to use any clocksource it wishes. > > Understood, in fact it's the same on x86. > > However, for PTP to work, the cycles value returned by the clocksource must > match the one returned by the hypercall. So for ARM > get_device_system_crosststamp must receive the arch timer clocksource, so > that it will return -ENODEV if the active clocksource is anything else. > As ptp_kvm clock has fixed to arm arch system counter in patch set v4, we need check if the current clocksource is system counter when return clock cycle in host, so a helper needed to return the current clocksource. Could I add this helper in next patch set? Thanks Jianyong wu > Paolo > > > In some cases, it is actually desirable (like these broken systems > > that cannot use an in-kernel irqchip...). Maybe it is that on x86 the > > guest only uses the kvm_clock, but that's a much harder sell on ARM. > > The fact that ptp_kvm assumes that the clocksource is fixed doesn't > > seem correct in that case. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel