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

[Stefan Hajnoczi]

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.

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.

Stefan