Re: [Xen-devel] [PATCH 3/3] x86/xen: sync the CMOS RTC as well as the Xen wallclock

[John Stultz <john.stultz@xxxxxxxxxx>]

On 05/14/2013 09:14 AM, Jan Beulich wrote:
> > > > On 14.05.13 at 17:59, John Stultz <john.stultz@xxxxxxxxxx> wrote:
> > On 05/14/2013 12:57 AM, Jan Beulich wrote:
> > > > > > On 14.05.13 at 02:52, John Stultz <john.stultz@xxxxxxxxxx> 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?
> Here it merely tells the hypervisor that the wall clock changed (so
> it can propagate this on to DomU-s).
Ok, I appreciate the explanation. Still waiting for acks on this one.

thanks
-john

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