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

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Message-ID: <51A4FF25.8040908@linaro.org>
Date:	Tue, 28 May 2013 12:01:57 -0700
From:	John Stultz <john.stultz@...aro.org>
To:	David Vrabel <david.vrabel@...rix.com>
CC:	xen-devel@...ts.xen.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86/xen: sync the CMOS RTC as well as the Xen wallclock

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
-john

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