linux-kernel - Re: [PATCH 1/2] x86/xen: sync the CMOS RTC as well as the Xen wallclock

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Message-ID: <20130528190530.GA24303@phenom.dumpdata.com>
Date:	Tue, 28 May 2013 15:05:30 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	David Vrabel <david.vrabel@...rix.com>, xen-devel@...ts.xen.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86/xen: sync the CMOS RTC as well as the Xen
 wallclock

On Tue, May 28, 2013 at 12:01:57PM -0700, John Stultz wrote:
> On 05/28/2013 11:22 AM, David Vrabel wrote:
> >From: David Vrabel <david.vrabel@...rix.com>
> >
> >Adjustments to Xen's persistent_clock via update_persistent_clock()
> >don't actually persist, as the xen_set_walltime() just notifies other
> >domN guests that it has been updated, and does not modify the
> >underlying CMOS clock.
> >
> >Thus, this patch modifies xen_set_wallclock() so it will set the
> >underlying CMOS clock when called from dom0, ensuring the
> >persistent_clock will be correct on the next hardware boot.
> >
> >Dom0 does not support accessing EFI runtime services and Xen does not
> >run on Moorsetown platforms so the CMOS RTC is the only supported
> >hardware clock.
> >
> >Signed-off-by: David Vrabel <david.vrabel@...rix.com>
> >Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> 
> Ok, I've queued this for 3.11.

Thanks.
> 
> thanks
> -john
> 
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