linux-kernel - Re: [PATCH 1/3] x86: increase precision of x86_platform.get/set

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Date:	Mon, 13 May 2013 17:57:26 -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>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] x86: increase precision of x86_platform.get/set_wallclock()

On 05/13/2013 10:56 AM, David Vrabel wrote:
> From: David Vrabel <david.vrabel@...rix.com>
>
> All the virtualized platforms (KVM, lguest and Xen) have persistent
> wallclocks that have more than one second of precision.
>
> read_persistent_wallclock() and update_persistent_wallclock() allow
> for nanosecond precision but their implementation on x86 with
> x86_platform.get/set_wallclock() only allows for one second precision.
> This means guests may see a wallclock time that is off by up to 1
> second.
>
> Make set_wallclock() and get_wallclock() take a struct timespec
> parameter (which allows for nanosecond precision) so KVM and Xen
> guests may start with a more accurate wallclock time and a Xen dom0
> can maintain a more accurate wallclock for guests.
>
> Signed-off-by: David Vrabel <david.vrabel@...rix.com>

This one looks pretty good.
Lets circle around on the other two and if after that they still don't 
make sense, I'll just queue this one.

Sorry if I'm being thick headed.

thanks
-john

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