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Date: Tue, 15 Nov 2016 11:09:56 +0100
From: Greg Kurz <groug@kaod.org>
Message-ID: <20161115110956.5393749d@bahia>
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Subject: Re: [Qemu-devel] QEMU postcopy-test failing on ppc64
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To: Laurent Vivier <lvivier@redhat.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, Dave Gilbert <dgilbert@redhat.com>, Andrea Arcangeli <aarcange@redhat.com>, qemu-devel <qemu-devel@nongnu.org>

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.

> Laurent