Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754605AbaJUIVH (ORCPT ); Tue, 21 Oct 2014 04:21:07 -0400 Received: from mail-wi0-f178.google.com ([209.85.212.178]:49601 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753403AbaJUIVE (ORCPT ); Tue, 21 Oct 2014 04:21:04 -0400 Date: Tue, 21 Oct 2014 10:20:58 +0200 From: Richard Cochran 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() Message-ID: <20141021082058.GB6808@netboy> References: <1413362372-16236-1-git-send-email-huishao@microsoft.com> <20141021040212.GA6278@unpythonic.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20141021040212.GA6278@unpythonic.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. Thanks, Richard -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/