linux-kernel - Re: [patch 5/5] PTP: add kvm PTP driver

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Date:   Fri, 20 Jan 2017 13:58:33 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Radim Krcmar <rkrcmar@...hat.com>,
        Richard Cochran <richardcochran@...il.com>,
        Miroslav Lichvar <mlichvar@...hat.com>
Subject: Re: [patch 5/5] PTP: add kvm PTP driver



On 20/01/2017 13:20, Marcelo Tosatti wrote:
> +		ret = kvm_hypercall2(KVM_HC_CLOCK_PAIRING,
> +				     clock_off_gpa,
> +				     KVM_CLOCK_PAIRING_WALLCLOCK);
> +		if (ret != 0) {
> +			pr_err("clock offset hypercall ret %lu\n", ret);
> +			spin_unlock(&kvm_ptp_lock);
> +			preempt_enable_notrace();
> +			return -EOPNOTSUPP;
> +		}
> +

Is it worth making this hypercall, or even all of ptp_kvm_get_time_fn, a
pv_ops entry?

But this looks good already, apart from my different preference on
emulate_ptp_sys_offset_mean.

Paolo