linux-kernel - RE: [PATCH v5 5/6] ptp: arm64: Enable ptp

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Message-ID: <HE1PR0801MB167654440A67AF072E28FFFDF4920@HE1PR0801MB1676.eurprd08.prod.outlook.com>
Date:   Wed, 16 Oct 2019 03:52:17 +0000
From:   "Jianyong Wu (Arm Technology China)" <Jianyong.Wu@....com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        "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>,
        "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "maz@...nel.org" <maz@...nel.org>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        Mark Rutland <Mark.Rutland@....com>,
        "will@...nel.org" <will@...nel.org>,
        Suzuki Poulose <Suzuki.Poulose@....com>
CC:     "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 (Arm Technology China)" <Kaly.Xin@....com>,
        "Justin He (Arm Technology China)" <Justin.He@....com>,
        nd <nd@....com>
Subject: RE: [PATCH v5 5/6] ptp: arm64: Enable ptp_kvm for arm64

Hi Paolo,

> -----Original Message-----
> From: Paolo Bonzini <pbonzini@...hat.com>
> Sent: Wednesday, October 16, 2019 12:39 AM
> To: Jianyong Wu (Arm Technology China) <Jianyong.Wu@....com>;
> netdev@...r.kernel.org; yangbo.lu@....com; john.stultz@...aro.org;
> tglx@...utronix.de; sean.j.christopherson@...el.com; maz@...nel.org;
> richardcochran@...il.com; Mark Rutland <Mark.Rutland@....com>;
> will@...nel.org; Suzuki Poulose <Suzuki.Poulose@....com>
> Cc: 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 (Arm Technology China)
> <Kaly.Xin@....com>; Justin He (Arm Technology China)
> <Justin.He@....com>; nd <nd@....com>
> Subject: Re: [PATCH v5 5/6] ptp: arm64: Enable ptp_kvm for arm64
> 
> On 15/10/19 12:48, Jianyong Wu wrote:
> > +int kvm_arch_ptp_get_clock_generic(struct timespec64 *ts,
> > +				   struct arm_smccc_res *hvc_res) {
> > +	u64 ns;
> > +	ktime_t ktime_overall;
> > +
> > +
> 	arm_smccc_1_1_invoke(ARM_SMCCC_VENDOR_HYP_KVM_PTP_FU
> NC_ID,
> > +				  hvc_res);
> > +	if ((long)(hvc_res->a0) < 0)
> > +		return -EOPNOTSUPP;
> > +
> > +	ktime_overall = hvc_res->a0 << 32 | hvc_res->a1;
> > +	*ts = ktime_to_timespec64(ktime_overall);
> > +
> > +	return 0;
> > +}
> > +
> 
> This seems wrong, who uses kvm_arch_ptp_get_clock_fn?
> 
This func used only by kvm_arch_ptp_get_clock and nothing to do with kvm_arch_ptp_get_clock_fn.
Also it can be merged into kvm_arch_ptp_get_clock.

> Paolo