Re: [Xen-devel] [xen-4.8-testing test] 114505: regressions - FAIL

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 16/10/17 17:12, Jan Beulich wrote:
>>>> On 16.10.17 at 11:14, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 15/10/17 20:45, osstest service owner wrote:
>>> flight 114505 xen-4.8-testing real [real]
>>> http://logs.test-lab.xenproject.org/osstest/logs/114505/ 
>>>
>>> Regressions :-(
>>>
>>> Tests which did not succeed and are blocking,
>>> including tests which could not be run:
>>>  test-xtf-amd64-amd64-2 48 xtf/test-hvm64-lbr-tsx-vmentry fail REGR. vs. 
>> 114173
>>> Tests which are failing intermittently (not blocking):
>>>  test-xtf-amd64-amd64-5 48 xtf/test-hvm64-lbr-tsx-vmentry fail in 114454 
>> pass in 114505
>>
>> Ian: These tests exercise something very machine specific, and the XTF
>> tests really do need tying to specific hardware when making regression
>> considerations.
>>
>> Jan: This highlights that TSX/VMEntry failure fixes probably want
>> backporting to before Xen 4.9.  IIRC, the 6 patches needed are:
> So I'm mildly confused by this request:
>
>> e3eb84e33c36 (only as a functional prerequisite)
>> 9b93c6b3695b: x86/vmx: introduce vmx_find_msr()
>> 7f11aa4b2b1f: x86/vmx: optimize vmx_read/write_guest_msr()
>> d6e9f8d4f35d: x86/vmx: fix vmentry failure with TSX bits in LBR
>> f97838bbd980: x86: Move microcode loading earlier
> Up to here, everything is in 4.9 already afaict. Considering the
> context here is a 4.8 test report, did you perhaps mean to ask
> for this on 4.8 (and possibly also 4.7)?

Well - I did ask for "backporting to before Xen 4.9".

> If so, I'm not really sure -
> these changes taken together look a little large for the gain
> they provide.

We have had several xen-devel reports of this problem, starting against
Xen 4.6 iirc.  If you really thing its more risk than its worth then fine.

>
>> 20f1976b4419: x86/vmx: Fix vmentry failure because of invalid LER on 
>> Broadwell
> I'll see to pull this one in for 4.9.1.

Oops - I'd not spotted that that change was missing in Xen 4.9.  Yes -
please backport that one.

~Andrew

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