linux-kernel - Re: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp

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Message-ID: <1cc145ca-1af2-d46f-d530-0ae434005f0b@redhat.com>
Date:   Wed, 9 Oct 2019 08:36:00 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     "Jianyong Wu (Arm Technology China)" <Jianyong.Wu@....com>,
        Marc Zyngier <maz@...nel.org>,
        "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>,
        "richardcochran@...il.com" <richardcochran@...il.com>,
        Mark Rutland <Mark.Rutland@....com>,
        Will Deacon <Will.Deacon@....com>,
        Suzuki Poulose <Suzuki.Poulose@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "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>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm.

On 09/10/19 07:21, Jianyong Wu (Arm Technology China) wrote:
> 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?

You don't need a helper.  You need to return the ARM arch counter
clocksource in the struct system_counterval_t that you return.
get_device_system_crosststamp will then check that the clocksource
matches the active one.

Paolo