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Subject: Re: [RFC PATCH v3 4/6] psci: Add hvc call service for ptp_kvm.
To:     "Jianyong Wu (Arm Technology China)" <Jianyong.Wu@arm.com>,
        Marc Zyngier <maz@kernel.org>,
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From:   Paolo Bonzini <pbonzini@redhat.com>
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Date:   Wed, 9 Oct 2019 08:36:00 +0200
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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