netdev - Re: [PATCH v19 6/7] KVM: arm64: Add support for the KVM PTP service

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Message-ID: <e4130244-10a6-3251-227b-6f99c3c5899b@huawei.com>
Date:   Sat, 17 Apr 2021 18:24:49 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     <netdev@...r.kernel.org>, <yangbo.lu@....com>,
        <john.stultz@...aro.org>, <tglx@...utronix.de>,
        <pbonzini@...hat.com>, <seanjc@...gle.com>,
        <richardcochran@...il.com>, <Mark.Rutland@....com>,
        <will@...nel.org>, <suzuki.poulose@....com>,
        <Andre.Przywara@....com>, <steven.price@....com>,
        <lorenzo.pieralisi@....com>, <sudeep.holla@....com>,
        <justin.he@....com>, <kvm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kernel-team@...roid.com>,
        <kvmarm@...ts.cs.columbia.edu>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v19 6/7] KVM: arm64: Add support for the KVM PTP service

On 2021/4/17 17:10, Marc Zyngier wrote:
> On Sat, 17 Apr 2021 09:59:39 +0100,
> Zenghui Yu <yuzenghui@...wei.com> wrote:
>>
>> On 2021/3/30 22:54, Marc Zyngier wrote:
>>> +PTP_KVM support for arm/arm64
>>> +=============================
>>> +
>>> +PTP_KVM is used for high precision time sync between host and guests.
>>> +It relies on transferring the wall clock and counter value from the
>>> +host to the guest using a KVM-specific hypercall.
>>> +
>>> +* ARM_SMCCC_HYP_KVM_PTP_FUNC_ID: 0x86000001
>>
>> Per include/linux/arm-smccc.h, this should be
>> ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID.
> 
> Well spotted. Care to send a patch on top of my kvm-arm64/ptp branch?

Okay. I'll have a patch for that.


Zenghui