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Date:   Sat, 17 Apr 2021 10:10:47 +0100
Message-ID: <87v98ls2co.wl-maz@kernel.org>
From:   Marc Zyngier <maz@kernel.org>
To:     Zenghui Yu <yuzenghui@huawei.com>
Cc:     <netdev@vger.kernel.org>, <yangbo.lu@nxp.com>,
        <john.stultz@linaro.org>, <tglx@linutronix.de>,
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        <richardcochran@gmail.com>, <Mark.Rutland@arm.com>,
        <will@kernel.org>, <suzuki.poulose@arm.com>,
        <Andre.Przywara@arm.com>, <steven.price@arm.com>,
        <lorenzo.pieralisi@arm.com>, <sudeep.holla@arm.com>,
        <justin.he@arm.com>, <kvm@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <kernel-team@android.com>,
        <kvmarm@lists.cs.columbia.edu>,
        <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v19 6/7] KVM: arm64: Add support for the KVM PTP service
In-Reply-To: <5aadf0b4-b9e5-8521-db60-52a0f319cf28@huawei.com>
References: <20210330145430.996981-1-maz@kernel.org>
        <20210330145430.996981-7-maz@kernel.org>
        <5aadf0b4-b9e5-8521-db60-52a0f319cf28@huawei.com>
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On Sat, 17 Apr 2021 09:59:39 +0100,
Zenghui Yu <yuzenghui@huawei.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?

Thanks,

	M.

-- 
Without deviation from the norm, progress is not possible.