Re: [Xen-devel] [xen-4.3-testing test] 63948: regressions - FAIL

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.11.15 at 16:58, <Ian.Jackson@xxxxxxxxxxxxx> wrote:
> Ian Jackson writes ("Re: [Xen-devel] [xen-4.3-testing test] 63948: 
> regressions - 
> FAIL"):
>> Ian Campbell writes ("Re: [Xen-devel] [xen-4.3-testing test] 63948: 
>> regressions 
> - FAIL"):
>> > But given this is a new test case I would be happy, I think, to restrict it
>> > to only go back as far as the earliest release which was in maintenance at
>> > the time the test was introduced (August this year), or maybe (if something
>> > just dropped out of maintenance recently) just the ones maintained today
>> > (since it took a while for the test case to "bed in" and be made working on
>> > some of the older ones). FWIW the last related fix I see in osstest was
>> > early October.
>> 
>> I think this is probably best.
> 
> Having discussed this on irc with Ian C, I think I have changed my
> mind.  Or maybe have, at least.
> 
> Do we know why this cross-version migration test fails when
> within-version migrations of both 4.2 and 4.3 succeed ?

As said in the original reply to the test report, this is due to vMCE
(validly) rejecting the incoming feature set. On 4.2, regardless of
CPU vendor, certain features got advertised to the guest. On 4.3
that advertisement became CPU vendor specific.

> Can things easily be fixed ?

Not sure. We could cheat and accept the known bogus value. But
should we even consider such on a no longer maintained branch?

Jan


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