Messages in this thread | | | Date | Tue, 14 May 2013 17:14:56 +0100 | From | "Jan Beulich" <> | Subject | Re: [Xen-devel] [PATCH 3/3] x86/xen: sync the CMOS RTC as well as the Xen wallclock |
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>>> On 14.05.13 at 17:59, John Stultz <john.stultz@linaro.org> wrote: > On 05/14/2013 12:57 AM, Jan Beulich wrote: >>>>> On 14.05.13 at 02:52, John Stultz <john.stultz@linaro.org> 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).
Jan
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