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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 08:59:44 -0700	[thread overview]
Message-ID: <51925F70.5000309@linaro.org> (raw)
In-Reply-To: <51920A9502000078000D5D84@nat28.tlf.novell.com>

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?

Either way, I don't have the context to insightfully review this, so 
I'll want this to get some Acked-bys from additional Xen folks before I 
queue it.

thanks
-john


  parent reply	other threads:[~2013-05-14 15:59 UTC|newest]

Thread overview: 69+ 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  0:57   ` John Stultz
2013-05-14 17:52   ` John Stultz
2013-05-14 17:52   ` John Stultz
2013-05-29  0:18   ` John Stultz
2013-05-29 12:16     ` David Vrabel
2013-05-29 12:16     ` David Vrabel
2013-05-29  0:18   ` John Stultz
2013-05-13 17:56 ` David Vrabel
2013-05-13 17:56 ` [PATCH 2/3] timekeeping: sync persistent clock and RTC on system time step changes David Vrabel
2013-05-13 17:56 ` 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         ` Jan Beulich
2013-05-15  8:16         ` [Xen-devel] " Jan Beulich
2013-05-15 18:10           ` John Stultz
2013-05-15 18:10           ` [Xen-devel] " John Stultz
2013-05-28 18:26             ` David Vrabel
2013-05-28 18:26             ` [Xen-devel] " David Vrabel
2013-05-28 18:31               ` Konrad Rzeszutek Wilk
2013-05-28 19:09                 ` John Stultz
2013-05-28 19:09                 ` [Xen-devel] " John Stultz
2013-05-28 19:48                   ` Konrad Rzeszutek Wilk
2013-05-28 19:48                   ` [Xen-devel] " Konrad Rzeszutek Wilk
2013-05-28 20:03                     ` John Stultz
2013-05-28 20:03                     ` [Xen-devel] " John Stultz
2013-05-28 20:11                       ` John Stultz
2013-05-28 20:25                         ` Konrad Rzeszutek Wilk
2013-05-28 20:25                           ` Konrad Rzeszutek Wilk
2013-05-28 20:30                           ` [Xen-devel] " John Stultz
2013-05-28 20:30                           ` John Stultz
2013-05-28 20:11                       ` John Stultz
2013-05-28 18:31               ` Konrad Rzeszutek Wilk
2013-05-28 19:06               ` John Stultz
2013-05-28 19:06               ` [Xen-devel] " John Stultz
2013-05-14 17:15       ` John Stultz
2013-05-14  9:47     ` David Vrabel
2013-05-14  0:40   ` 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     ` Jan Beulich
2013-05-14  7:57     ` [Xen-devel] " Jan Beulich
2013-05-14 15:59       ` John Stultz
2013-05-14 15:59       ` John Stultz [this message]
2013-05-14 16:14         ` [Xen-devel] " Jan Beulich
2013-05-14 16:17           ` John Stultz
2013-05-14 16:24             ` Konrad Rzeszutek Wilk
2013-05-14 16:24             ` [Xen-devel] " Konrad Rzeszutek Wilk
2013-05-14 16:28               ` John Stultz
2013-05-14 16:28               ` [Xen-devel] " John Stultz
2013-05-14 16:17           ` John Stultz
2013-05-14 16:14         ` Jan Beulich
2013-05-14  9:55     ` David Vrabel
2013-05-14  9:55     ` David Vrabel
2013-05-14  0:52   ` John Stultz
2013-05-14 17:24   ` John Stultz
2013-05-14 17:24   ` John Stultz
2013-05-14 18:00     ` David Vrabel
2013-05-14 18:00     ` David Vrabel
2013-05-14 18:03       ` John Stultz
2013-05-14 18:03       ` John Stultz
2013-05-15  8:19     ` Jan Beulich
2013-05-15  8:19     ` [Xen-devel] " Jan Beulich
2013-05-15 18:13       ` John Stultz
2013-05-15 18:13       ` John Stultz
2013-05-13 17:56 ` David Vrabel

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