Re: [Qemu-devel] QEMU postcopy-test failing on ppc64

[Stefan Hajnoczi <stefanha@gmail.com>]

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On Tue, Nov 15, 2016 at 01:58:38PM +0100, Laurent Vivier wrote:
> 
> 
> On 15/11/2016 13:20, Dr. David Alan Gilbert wrote:
> > * Stefan Hajnoczi (stefanha@gmail.com) wrote:
> >> On Tue, Nov 15, 2016 at 10:09 AM, Greg Kurz <groug@kaod.org> wrote:
> >>> On Tue, 15 Nov 2016 10:53:35 +0100
> >>> Laurent Vivier <lvivier@redhat.com> wrote:
> >>>
> >>>> On 14/11/2016 21:52, Stefan Hajnoczi wrote:
> >>>>> I hit a failure running "make check" on ppc64 for the first time.  Ideas?
> >>>>>
> >>>>> Stefan
> >>>>>
> >>>>> commit 682df581c65ed2c1b9e77093e332214ecaa1ee93
> >>>>>
> >>>>>   GTESTER check-qtest-ppc64
> >>>>> Memory content inconsistency at 5af4000 first_byte = 1b last_byte = 1a
> >>>>> current = 7c hit_edge = 1
> >>>>> Memory content inconsistency at 5af5000 first_byte = 1b last_byte = 7c
> >>>>> current = 1b hit_edge = 1
> >>>>> Memory content inconsistency at 5e59000 first_byte = 1b last_byte = 1b
> >>>>> current = 1a hit_edge = 1
> >>>>> **
> >>>>> ERROR:tests/postcopy-test.c:345:check_guests_ram: 'bad' should be FALSE
> >>>>> GTester: last random seed: R02S9d79166a1ca7e21940a0f4b0b1255d5b
> >>>>>
> >>>>
> >>>> Are you using KVM PR?
> >>>>
> >>>> it  was working fine with TCG and KVM HV.
> >>>>
> >>>> Apparently, USERFAULTFD doesn't work with KVM PR.
> >>>>
> >>>> I've already seen this kind of error with nested KVM on Power:
> >>>> guest in guest with KVM PR in host.
> >>>>
> >>>> This problem was reported on IRC by Greg if I remember correctly (CC:)
> >>>>
> >>>
> >>> Yeah I hit this when running make check in a PPC64 BE guest which
> >>> has kvm_pr loaded. I did not find time to investigate though... I've
> >>> switched to run make check on bare metal POWER7 instead.
> >>
> >> Right, it's POWER7 PPC64 BE with kvm_pr.
> >>
> >> If this should be fixed for QEMU 2.8 please add it to
> >> http://qemu-project.org/Planning/2.8 and I'll track it (i.e. won't
> >> release before it's resolved).
> >>
> >> If this is a known issue that will be in QEMU 2.8 please add it to
> >> http://qemu-project.org/ChangeLog/2.8#Known_issues.
> > 
> > I don't think it's new with 2.8 (Laurent?) and I think it's actually
> > a kernel issue that needs fixing.
> 
> I's not a regression and I think it's a kernel issue.
> 
> As it has never worked with KVM PR and can't be fixed at QEMU level, we
> can't solve it for 2.8 (no tracking).
> 
> I'm going to update the know issues for 2.8.
> [and I'm going to try to understand what really happens]

Should the test be skipped on KVM PR?

It's a shame that make check fails.

Stefan

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