linux-kernel - Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for do

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Date:	Mon, 20 Oct 2014 23:02:13 -0500
From:	Jeff Epler <jepler@...ythonic.net>
To:	Thomas Shao <huishao@...rosoft.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	KY Srinivasan <kys@...rosoft.com>,
	John Stultz <john.stultz@...aro.org>,
	Richard Cochran <rcochran@...utronix.de>
Subject: Re: [PATCH v2 1/2] timekeeping: add EXPORT_SYMBOL_GPL for
 do_adjtimex()

On Tue, Oct 21, 2014 at 03:18:58AM +0000, Thomas Shao wrote:
> In some situation, the user is not able to enable guest VM to sync with external 
> time source, like NTP. But the host is still synced with a trusted time source. 
> In this case, host-guest time synchronization is useful.

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.
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