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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.01.14 at 12:54, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> On 21/01/14 10:28, Andrew Cooper wrote:
>> The major issue identified is with Windows 8/8.1 and Server 2012/2012r2,
>> which have problems on live migrate.  Some source of time is
>> unexpectedly jumping forwards by two days, from the correct time to 2
>> days in the future.  The observed result is that it looses its DHCP
>> lease, drops its IP address and networking ceases to work (It appears
>> that windows will not attempt to renew the lease itself).
>>
> 
> This is caused by commit e36cd2cdc9674a7a4855d21fb7b3e6e17c4bb33b
> "x86/viridian: Time Reference Count MSR"
> 
> After double checking with the specification, it does appear to be
> implemented as required (subject to a potential issue with multiple vcpu
> guests).
> 
> I am currently experimenting to see whether hvm_get_guest_time() is
> returning unexpected values, or whether it is returning expected values
> and Windows is interpreting them differently.
> 
> At this point in the 4.4 release cycle, reverting the patch should be
> seriously considered, although I would like to see whether it is
> possible to work out why it is wrong and whether there is an obvious fix
> first.

I suppose you and/or Paul will let us know either way.

Jan


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