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

[Stefan Hajnoczi]

On Tue, Nov 15, 2016 at 2:56 PM, Greg Kurz <address@hidden> wrote:
> On Tue, 15 Nov 2016 11:14:57 +0000
> Stefan Hajnoczi <address@hidden> wrote:
>
>> On Tue, Nov 15, 2016 at 10:09 AM, Greg Kurz <address@hidden> wrote:
>> > On Tue, 15 Nov 2016 10:53:35 +0100
>> > Laurent Vivier <address@hidden> 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.
>>
>
> And you cannot install a PPC64 BE distro on this POWER7 host and use
> kvm_hv instead ?

Sure, I could get a non-kvm_pr environment.  I'm just concerned that
QEMU 2.8-rc0 is being tagged today and there is a POWER environment
where "make check" fails.

Is kvm_pr supported by QEMU?

If it is supported then "make check" ought to pass.

Stefan