Re: [Xen-devel] Nested virt broken in Linux 4.9 (was Re: [OSSTEST PATCH 2/3] ap-common: Switch to Linux 4.9 by default [and 1 more messages])

[Julien Grall <julien.grall@xxxxxxx>]

Hi Ian,

On 30/05/17 16:47, Ian Jackson wrote:
> Boris Ostrovsky writes ("Re: Nested virt broken in Linux 4.9 (was Re: [OSSTEST PATCH 
> 2/3] ap-common: Switch to Linux 4.9 by default [and 1 more messages])"):
> > On 05/30/2017 10:28 AM, Ian Jackson wrote:
> > > osstest service owner writes ("[osstest test] 109837: regressions - FAIL"):
> > > > Tests which did not succeed and are blocking,
> > > > including tests which could not be run:
> > > >  test-amd64-amd64-qemuu-nested-amd 13 xen-boot/l1   fail REGR. vs. 109601
> > > >  test-amd64-amd64-qemuu-nested-intel 13 xen-boot/l1 fail REGR. vs. 109601
> > > The L1 console log is here:
> ...
> > The test is using 4.9.21 kernel and it looks like the patch that fixed
> > earlier regression shows up in 4.9 tree at 4.9.28 (commit
> > 5d7ab8339a9a9e745c672279437657654268be81).
> Thanks for investigating.  osstest tries to to track 4.9.y.
>
> However, it is blocked because of persistent failures like this one:
>
> osstest service owner writes ("[linux-4.9 test] 109836: regressions - trouble: 
> broken/fail/pass"):
> > flight 109836 linux-4.9 real [real]
> > http://logs.test-lab.xenproject.org/osstest/logs/109836/
> >
> > Regressions :-(
> >
> > Tests which did not succeed and are blocking,
> > including tests which could not be run:
> >  test-armhf-armhf-xl-credit2   6 xen-boot          fail REGR. vs. 107358
> Does anyone have any idea why this test should fail consistently ?
> The corresponding test with the default credit1 scheduler fails too.
> But it works on the other branches (which are using linux 3.18):
>   
> http://logs.test-lab.xenproject.org/osstest/results/history/test-armhf-armhf-xl/ALL
>   
> http://logs.test-lab.xenproject.org/osstest/results/history/test-armhf-armhf-xl-credit2/ALL
>
> These are, admittedly, on the unreliable arndales, but:
>   
> http://logs.test-lab.xenproject.org/osstest/results/host/arndale-bluewater.html
>
> So I think this is a problem with 4.9.
There are two missing patches in Linux 4.9 to be able to boot on the 
Arndale:
        - c827283586a4 "ARM: 8636/1: Cleanup sanity_check_meminfo"
        - 92ed32019d0d "ARM: 8637/1: Adjust memory boundaries after reservation"

They are part of the linux-arm-xen branch (also based on Xen 4.9) but I 
haven't yet requested to backport them in staging.
Cheers,


--
Julien Grall

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