From: John Stultz <john.stultz@linaro.org>
To: Jan Beulich <JBeulich@suse.com>
Cc: David Vrabel <david.vrabel@citrix.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
Thomas Gleixner <tglx@linutronix.de>,
xen-devel@lists.xen.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
linux-kernel@vger.kernel.org
Subject: Re: [Xen-devel] [PATCH 3/3] x86/xen: sync the CMOS RTC as well as the Xen wallclock
Date: Tue, 14 May 2013 09:17:26 -0700 [thread overview]
Message-ID: <51926396.4040203@linaro.org> (raw)
In-Reply-To: <51927F2002000078000D6224@nat28.tlf.novell.com>
On 05/14/2013 09:14 AM, Jan Beulich wrote:
>>>> On 14.05.13 at 17:59, John Stultz <john.stultz@linaro.org> wrote:
>> On 05/14/2013 12:57 AM, Jan Beulich wrote:
>>>>>> On 14.05.13 at 02:52, John Stultz <john.stultz@linaro.org> wrote:
>>>> Honestly, it seems a little strange to me. If you're running as dom0,
>>>> why does HYPERVISOR_dom0_op() not cause the hypervisor to set the cmos
>>>> its virtualizing? This seems to mess with the proper virtualization
>>>> layering.
>>> Thy hypervisor tries to control as little system and peripheral devices
>>> as possible, and the CMOS (including the clock) is among those not
>>> controlled by it, but by Dom0.
>> Huh. So what does calling HYPERVISOR_dom0_op do then?
> Here it merely tells the hypervisor that the wall clock changed (so
> it can propagate this on to DomU-s).
Ok, I appreciate the explanation. Still waiting for acks on this one.
thanks
-john
next prev parent reply other threads:[~2013-05-14 16:17 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-13 17:56 [PATCH 0/3] x86,time,xen: maintain an accurate persistent clock in more cases David Vrabel
2013-05-13 17:56 ` [PATCH 1/3] x86: increase precision of x86_platform.get/set_wallclock() David Vrabel
2013-05-14 0:57 ` John Stultz
2013-05-14 17:52 ` John Stultz
2013-05-29 0:18 ` John Stultz
2013-05-29 12:16 ` David Vrabel
2013-05-13 17:56 ` [PATCH 2/3] timekeeping: sync persistent clock and RTC on system time step changes David Vrabel
2013-05-14 0:40 ` John Stultz
2013-05-14 9:47 ` David Vrabel
2013-05-14 17:15 ` John Stultz
2013-05-15 8:16 ` [Xen-devel] " Jan Beulich
2013-05-15 18:10 ` John Stultz
2013-05-28 18:26 ` David Vrabel
2013-05-28 18:31 ` Konrad Rzeszutek Wilk
2013-05-28 19:09 ` John Stultz
2013-05-28 19:48 ` Konrad Rzeszutek Wilk
2013-05-28 20:03 ` John Stultz
2013-05-28 20:11 ` John Stultz
2013-05-28 20:25 ` Konrad Rzeszutek Wilk
2013-05-28 20:30 ` John Stultz
2013-05-28 19:06 ` John Stultz
2013-05-13 17:56 ` [PATCH 3/3] x86/xen: sync the CMOS RTC as well as the Xen wallclock David Vrabel
2013-05-14 0:52 ` John Stultz
2013-05-14 7:57 ` [Xen-devel] " Jan Beulich
2013-05-14 15:59 ` John Stultz
2013-05-14 16:14 ` Jan Beulich
2013-05-14 16:17 ` John Stultz [this message]
2013-05-14 16:24 ` Konrad Rzeszutek Wilk
2013-05-14 16:28 ` John Stultz
2013-05-14 9:55 ` David Vrabel
2013-05-14 17:24 ` John Stultz
2013-05-14 18:00 ` David Vrabel
2013-05-14 18:03 ` John Stultz
2013-05-15 8:19 ` [Xen-devel] " Jan Beulich
2013-05-15 18:13 ` John Stultz
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