Re: [Xen-devel] Time Skewing on Windows XP

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.03.13 at 16:16, Suravee Suthikulanit <suravee.suthikulpanit@xxxxxxx> 
>>> wrote:
> I finally traced the issue back to the patch that this first happened.  This 
> bug started in the patch :
> 
> H86/HVM: assorted RTC emulation adjustment (w/ git commit id 
> 620d5dad54008e40798c4a0c4322aef274c36fa3)
> 
> I believe there are some issues with the changes in rtc_ioport_read in the 
> arch/x86/hvm/rtc.c and in the pt_update_irq().

One thing you may want to try is remove the call from REG_C
read to rtc_timer_update() again - on a second thought it may
be wrong to do it here, as (other than check_update_timer()
and alarm_timer_update()) the function doesn't change with
RTC_PF getting cleared (i.e. I may have wrongly added the call
in analogy to the other two).

I would expect the issue to be that create_periodic_time()
pointlessly destroys and then recreates an identical rate timer.

I'm puzzled though that some Windows versions depend on
the RTC to maintain their wall clock time...

Jan


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