Re: [Xen-devel] [PATCH] x86: Xen PV guests don't have the rtc_cmos platform device

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

On 2015-12-09 15:42, Jan Beulich wrote:
> > > > On 09.12.15 at 15:32, <boris.ostrovsky@xxxxxxxxxx> wrote:
> > --- a/arch/x86/kernel/rtc.c
> > +++ b/arch/x86/kernel/rtc.c
> > @@ -200,6 +200,9 @@ static __init int add_rtc_cmos(void)
> >         }
> >  #endif
> >
> > +       if (paravirt_enabled())
> > +               return -ENODEV;
> What about Xen Dom0?
>
> Jan
Checked that in my testing and that still worked:
[   16.733837] rtc_cmos 00:02: RTC can wake from S4
[   16.734030] rtc_cmos 00:02: rtc core: registered rtc_cmos as rtc0
[   16.734087] rtc_cmos 00:02: alarms up to one month, y3k, 114 bytes 
nvram
[   17.760329] rtc_cmos 00:02: setting system clock to 2015-12-09 
08:43:48 UTC (1449650628)
and /dev/rtc and /dev/rtc0 both exist.

But i don't know the nitty gritty details about why ...
--
Sander

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