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

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Message-ID: <fc847a82-49cb-c931-617c-82ef5531963e@redhat.com>
Date:   Mon, 14 Oct 2019 08:58:54 +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 14/10/19 07:50, Jianyong Wu (Arm Technology China) wrote:
>>
>> John (Stultz), does that sound good to you?  The context is that Jianyong
>> would like to add a hypercall that returns a (cycles,
>> nanoseconds) pair to the guest.  On x86 we're relying on the vclock_mode
>> field that is already there for the vDSO, but being able to just use
>> ktime_get_snapshot would be much nicer.
>>
> Could I add struct clocksource to system_time_snapshot struct in next version of my patch set?

Yes, I say go ahead.  At least it will get closer to a final design.

Paolo