From: "Jianyong Wu (Arm Technology China)" <Jianyong.Wu@arm.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
"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>,
"sean.j.christopherson@intel.com"
<sean.j.christopherson@intel.com>,
"maz@kernel.org" <maz@kernel.org>,
"richardcochran@gmail.com" <richardcochran@gmail.com>,
Mark Rutland <Mark.Rutland@arm.com>,
Will Deacon <Will.Deacon@arm.com>,
Suzuki Poulose <Suzuki.Poulose@arm.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
Steve Capper <Steve.Capper@arm.com>,
"Kaly Xin (Arm Technology China)" <Kaly.Xin@arm.com>,
"Justin He (Arm Technology China)" <Justin.He@arm.com>,
nd <nd@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: RE: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm.
Date: Mon, 23 Sep 2019 04:57:57 +0000 [thread overview]
Message-ID: <HE1PR0801MB1676A9D4A58118144F5C7B54F4850@HE1PR0801MB1676.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <ef6ab8bd-41ad-88f8-9cfd-dc749ca65310@redhat.com>
Hi Paolo, Marc
> -----Original Message-----
> From: Paolo Bonzini <pbonzini@redhat.com>
> Sent: Thursday, September 19, 2019 7:07 PM
> To: Jianyong Wu (Arm Technology China) <Jianyong.Wu@arm.com>;
> netdev@vger.kernel.org; yangbo.lu@nxp.com; john.stultz@linaro.org;
> tglx@linutronix.de; sean.j.christopherson@intel.com; maz@kernel.org;
> richardcochran@gmail.com; Mark Rutland <Mark.Rutland@arm.com>; Will
> Deacon <Will.Deacon@arm.com>; Suzuki Poulose
> <Suzuki.Poulose@arm.com>
> Cc: linux-kernel@vger.kernel.org; kvm@vger.kernel.org; Steve Capper
> <Steve.Capper@arm.com>; Kaly Xin (Arm Technology China)
> <Kaly.Xin@arm.com>; Justin He (Arm Technology China)
> <Justin.He@arm.com>; nd <nd@arm.com>; 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 11:46, Jianyong Wu (Arm Technology China) wrote:
> >> On 18/09/19 11:57, Jianyong Wu (Arm Technology China) wrote:
> >>> Paolo Bonzini wrote:
> >>>> This is not Y2038-safe. Please use ktime_get_real_ts64 instead,
> >>>> and split the 64-bit seconds value between val[0] and val[1].
> >
> > Val[] should be long not u32 I think, so in arm64 I can avoid that
> > Y2038_safe, but also need rewrite for arm32.
>
> I don't think there's anything inherently wrong with u32 val[], and as you
> notice it lets you reuse code between arm and arm64. It's up to you and
> Marc to decide.
>
To compatible 32-bit, Integrates second value and nanosecond value as a nanosecond value then split it into val[0] and val[1] and split cycle value into val[2] and val[3],
In this way, time will overflow at Y2262.
WDYT?
Thanks
Jianyong Wu
next prev parent reply other threads:[~2019-09-23 4:58 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-18 8:07 [RFC PATCH v3 0/6] Enable ptp_kvm for arm64 Jianyong Wu
2019-09-18 8:07 ` [RFC PATCH v3 1/6] psci: Export psci_ops.conduit symbol as modules will use it Jianyong Wu
2019-09-18 8:07 ` [RFC PATCH v3 2/6] ptp: Reorganize ptp_kvm modules to make it arch-independent Jianyong Wu
2019-09-18 8:07 ` [RFC PATCH v3 3/6] timekeeping: Expose API allowing retrival of current clocksource and counter value Jianyong Wu
2019-09-18 8:29 ` Paolo Bonzini
2019-09-18 8:07 ` [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm Jianyong Wu
2019-09-18 8:25 ` Paolo Bonzini
2019-09-18 9:57 ` Jianyong Wu (Arm Technology China)
2019-09-18 10:23 ` Paolo Bonzini
2019-09-19 9:46 ` Jianyong Wu (Arm Technology China)
2019-09-19 11:07 ` Paolo Bonzini
2019-09-19 11:39 ` Marc Zyngier
2019-09-19 12:13 ` Paolo Bonzini
2019-09-23 3:19 ` Jianyong Wu (Arm Technology China)
2019-10-09 5:21 ` Jianyong Wu (Arm Technology China)
2019-10-09 6:36 ` Paolo Bonzini
2019-10-09 8:18 ` Jianyong Wu (Arm Technology China)
2019-10-09 9:13 ` Paolo Bonzini
2019-10-09 16:05 ` John Stultz
2019-10-09 20:56 ` Paolo Bonzini
2019-10-14 5:50 ` Jianyong Wu (Arm Technology China)
2019-10-14 6:58 ` Paolo Bonzini
2019-09-23 4:57 ` Jianyong Wu (Arm Technology China) [this message]
2019-09-24 14:20 ` Paolo Bonzini
2019-09-25 10:27 ` Jianyong Wu (Arm Technology China)
2019-09-18 8:07 ` [RFC PATCH v3 5/6] ptp: arm64: Enable ptp_kvm for arm64 Jianyong Wu
2019-09-18 8:07 ` [RFC PATCH v3 6/6] kvm: arm64: Add capability check extension for ptp_kvm Jianyong Wu
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