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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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


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