Re: [Xen-devel] Results from the Xen 4.4-rc2 test day

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 01/24/2014 11:37 AM, Andrew Cooper wrote:
> On 24/01/14 09:23, Jan Beulich wrote:
> > > > > On 23.01.14 at 18:17, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> > > The value of time read from hvm_get_guest_time() resets with a new
> > > domid, making it an inappropriate source of time for the described
> > > function of the MSR.
> > >
> > > I suspect Windows 8 only notices at first on migration as I believe that
> > > it is the first case where the generation ID is supposed to change and
> > > signal a reset of state.  The detection of the failure is actually
> > > further complicated as there appears to be a race condition between the
> > > guest tools reseting the clock back to the correct value, and the DHCP
> > > lease being flushed.  XenRT only notices the failure if the DHCP lease
> > > is actually lost (thus XenRT can't communicate with it's xmlrpc daemon
> > > inside the VM), and doesn't directly notice the foward/backward stepping
> > > in time.
> > >
> > > Anyway - please revert the patch - it will be a non-trivial change to
> > > expose an appropriate source of time to be consumed by this MSR.
> > Done, albeit not completely - I left the #define-s in place.
> >
> > Jan
> Thanks - I have pulled XenServer's 4.4-rc2 branch forward to current
> staging, and the w2k12 vmlifecycle tests are now working without error.
>
> I shall organise another full nightly regression test for some time in
> the next few days.
Overall, excellent news.  Thanks.

 -George

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