[libvirt] [Qemu-devel] [PULL 00/45] Machine queue, 2018-10-18

[Philippe Mathieu-Daudé]

On Fri, Oct 19, 2018 at 7:00 PM Philippe Mathieu-Daudé
<philmd at redhat.com> wrote:
> On 19/10/2018 16:12, Peter Maydell wrote:
...
> >> ----------------------------------------------------------------
> >>
> >
> > Hi. This had some problems in merge testing, I'm afraid:
> >
> > On aarch64 host, warnings running tests/cpu-plug-test for i386 and s390 targets:
> >
> > TEST: tests/cpu-plug-test... (pid=12602)
> >   /i386/cpu-plug/pc-i440fx-3.0/cpu-add/1x3x2&maxcpus=12:
> > qemu-system-i386: warning: Invalid CPU topology deprecated: sockets
> > (1) * cores (3) * threads (2) != maxcpus (12)
> > OK
> >   /i386/cpu-plug/pc-i440fx-3.0/device-add/1x3x2&maxcpus=12:
> > qemu-system-i386: warning: Invalid CPU topology deprecated: sockets
> > (1) * cores (3) * threads (2) != maxcpus (12)
> > OK
> >   /i386/cpu-plug/pc-q35-3.0/cpu-add/1x3x2&maxcpus=12:
> > qemu-system-i386: warning: Invalid CPU topology deprecated: sockets
> > (1) * cores (3) * threads (2) != maxcpus (12)
> > OK
> >   /i386/cpu-plug/pc-q35-3.0/device-add/1x3x2&maxcpus=12:
> > qemu-system-i386: warning: Invalid CPU topology deprecated: sockets
> > (1) * cores (3) * threads (2) != maxcpus (12)
> > OK
> >   /arm/qom/n800:                                                       OK
> > PASS: tests/cpu-plug-test
> > [...]
> > TEST: tests/cpu-plug-test... (pid=15040)
> >   /s390x/cpu-plug/s390-ccw-virtio-3.1/cpu-add/1x3x1&maxcpus=6:
> > qemu-system-s390x: warning: Invalid CPU topology deprecated: sockets
> > (1) * cores (3) * threads (1) != maxcpus (6)
> > OK
> >   /s390x/cpu-plug/s390-ccw-virtio-3.1/device-add/1x3x1&maxcpus=6:
> > qemu-system-s390x: warning: Invalid CPU topology deprecated: sockets
> > (1) * cores (3) * threads (1) != maxcpus (6)
> > OK
> >   /s390x/cpu-plug/s390-ccw-virtio-3.0/cpu-add/1x3x1&maxcpus=6:
> > qemu-system-s390x: warning: Invalid CPU topology deprecated: sockets
> > (1) * cores (3) * threads (1) != maxcpus (6)
> > OK
> >   /s390x/cpu-plug/s390-ccw-virtio-3.0/device-add/1x3x1&maxcpus=6:
> > qemu-system-s390x: warning: Invalid CPU topology deprecated: sockets
> > (1) * cores (3) * threads (1) != maxcpus (6)
> > OK
> > PASS: tests/cpu-plug-test
> >
> > (plus similar ppc64, x86_64 targets)
> >
> > I see similar warnings on hosts SPARC, PPC64BE, S390, 32-bit Arm
> > and x86 FreeBSD.
> >
> > I also got a build failure on one of my configs, but I think that
> > is caused by some latent bug in our makefiles where we don't
> > correctly rebuild x86_64-softmmu/config-devices.mak when a
> > change is made to default-configs/i386-softmmu.mak -- doing a
> > hand rm of the config-devices.mak fixed it.
>
> bisected to:
>
> 23d0571a24559b867fa47410aa8ec0519b0a1edd is the first bad commit
> commit 23d0571a24559b867fa47410aa8ec0519b0a1edd
> Author: Igor Mammedov <imammedo at redhat.com>
> Date:   Thu Sep 13 13:06:01 2018 +0200
>
>     vl.c deprecate incorrect CPUs topology
>
>     -smp [cpus],sockets/cores/threads[,maxcpus] should describe topology
>     so that total number of logical CPUs [sockets * cores * threads]
>     would be equal to [maxcpus], however historically we didn't have
>     such check in QEMU and it is possible to start VM with an invalid
>     topology.
>     Deprecate invalid options combination so we can make sure that
>     the topology VM started with is always correct in the future.
>     Users with an invalid sockets/cores/threads/maxcpus values should
>     fix their CLI to make sure that
>        [sockets * cores * threads] == [maxcpus]

Per the commit message, I understand the tests need to be upgraded,
they only test it is <= maxcpus while now we want == maxcpus:

static void add_s390x_test_case(const char *mname)
{
    ...
    data->sockets = 1;
    data->cores = 3;
    data->threads = 1;
    data->maxcpus = data->sockets * data->cores * data->threads * 2;