Re: [Xen-devel] [PATCH 1/3] x86: increase precision of x86_platform.get/set_wallclock()

[John Stultz <john.stultz@xxxxxxxxxx>]

On 05/13/2013 10:56 AM, David Vrabel wrote:
> From: David Vrabel <david.vrabel@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
I've gone ahead and queued this one for 3.11

thanks
-john


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