Re: [Xen-devel] how to keep time of windows pvhvm synchronized with host after resuming

[ANNIE LI <annie.li@xxxxxxxxxx>]

On 2010-9-24 23:18, Tim Deegan wrote:
> No, that's fine.  wc_secs is what you add to NOW() to get wallclock to
> it shouldn't change, or at least very rarely.  I thought from your
> earlier email that it was always zero, which would be odd.
Thanks for your confirmation.
 I thought wc_secs is a changeable value, so i am wrong.
The NOW() is calling get_s_time() here, which has problem with RDTSC you 
mentioned.
So the next step is to get system time through hypercall HVMOP_get_time, 
and then add wc_secs
to get wallclock.
Is it the patch you mentioned in 
http://lists.xensource.com/archives/html/xen-devel/2010-07/msg00477.html ?
I will add this patch and get the wallclock time then.

> And is that equal to zero?  If not, what exactly is the problem?  I
> think I've got confused about what's going wrong.
Yes, I got zero value for wc_secs several days ago. But it became 
non-zero after i rebooted dom0,
and i failed to reproduce the issue now. I assumed wc_secs should change 
regularly.
Sorry for my misunderstanding.

Thanks
Annie

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