[Xen-devel] Re: [PATCH] [PVOPS] dom0 sync xen wallclock

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

On 02/19/2010 01:10 AM, Ian Campbell wrote:
> Unfortunately there is an existing large installed base of guests which
> use the dependent wallclock mode since it is the default in oldstyle Xen
> kernels.
>    
Sure.  I'm not suggesting that we remove the existing hypercall.  I just 
don't think we should extend it or encourage its use.
> >      * HVM domains similarly get an emulated CMOS implemented in qemu
> >      
> Isn't this currently emulated within the hypervisor using the wallclock
> time within Xen? I assume that it was pulled into the h/v for a specific
> reason? I'm not sure what reason though, the emulated RTC doesn't seem
> especially performance critical...
>    
It is?  I wonder why we bothered adding a pvop for it then...

    J

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