From: Thomas Shao <huishao@microsoft.com>
To: Richard Cochran <richardcochran@gmail.com>,
        Jeff Epler <jepler@unpythonic.net>
CC: Thomas Gleixner <tglx@linutronix.de>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        LKML <linux-kernel@vger.kernel.org>,
        "devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
        "olaf@aepfle.de" <olaf@aepfle.de>,
        "apw@canonical.com" <apw@canonical.com>,
        "jasowang@redhat.com" <jasowang@redhat.com>,
        KY Srinivasan <kys@microsoft.com>,
        John Stultz <john.stultz@linaro.org>,
        Richard Cochran <rcochran@linutronix.de>
Subject: RE: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
 do_adjtimex()
Thread-Topic: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
 do_adjtimex()
Thread-Index: AQHP6EpL5oa00nhAzECMXNpwI49m+pw5VpSAgAADkACAAIUwkIAAF66AgABISwCAABt+4A==
Date: Tue, 21 Oct 2014 10:11:36 +0000
Message-ID: <CD2CABCB2C0A0D4682C5F8AD840141540D33BC@HKXPRD3002MB006.064d.mgd.msft.net>
References: <1413362372-16236-1-git-send-email-huishao@microsoft.com>
 <alpine.DEB.2.11.1410202027220.5308@nanos>
 <alpine.DEB.2.11.1410202034150.5308@nanos>
 <CD2CABCB2C0A0D4682C5F8AD840141540D27B9@HKXPRD3002MB006.064d.mgd.msft.net>
 <20141021040212.GA6278@unpythonic.net> <20141021082058.GB6808@netboy>
In-Reply-To: <20141021082058.GB6808@netboy>
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> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel-
> owner@vger.kernel.org] On Behalf Of Richard Cochran
> Sent: Tuesday, October 21, 2014 4:21 PM
> To: Jeff Epler
> Cc: Thomas Shao; Thomas Gleixner; gregkh@linuxfoundation.org; LKML;
> devel@linuxdriverproject.org; olaf@aepfle.de; apw@canonical.com;
> jasowang@redhat.com; KY Srinivasan; John Stultz; Richard Cochran
> Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
> do_adjtimex()
> 
> On Mon, Oct 20, 2014 at 11:02:13PM -0500, Jeff Epler wrote:
> > It's interesting to imagine that a virtualization host could present a
> > time service to the guest *userspace*, even when the guest is not
> > otherwise exposed to the internet at large.  This could take the form
> > of an NTP server on a private network, or as an implementation of a
> > time source directly usable by ntpd in the guest, for instance as an
> > emulated serial port with synthetic NEMA GPS signal + PPS signal, for
> instance.
> 
> If the idea is to avoid bothering the guest user space, in order to be
> convenient, then the host can provide a synthetic PPS, to be used by the
> kernel's hardpps logic.
> 

This is something I should consider.  I'll do more investigation for this. Thanks Richard.

> Thanks,
> Richard
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