Re: [Qemu-devel] [PATCH v3 for-2.12 14/14] s390x: change the QEMU cpu model to a stripped down z12

["Daniel P. Berrange" <berrange@redhat.com>]

On Fri, Dec 08, 2017 at 05:29:36PM +0100, David Hildenbrand wrote:
> On 08.12.2017 17:26, Cornelia Huck wrote:
> > On Fri,  8 Dec 2017 17:02:07 +0100
> > David Hildenbrand <david@redhat.com> wrote:
> > 
> >> We are good enough to boot upstream Linux kernels / Fedora 26/27. That
> >> should be sufficient for now.
> >>
> >> As the QEMU CPU model is migration safe, let's add compatibility code.
> >> Generate the feature list to reduce the chance of messing things up in the
> >> future.
> >>
> >> Signed-off-by: David Hildenbrand <david@redhat.com>
> >> ---
> >>  hw/s390x/s390-virtio-ccw.c  |   8 ++++
> >>  target/s390x/cpu.h          |   3 ++
> >>  target/s390x/cpu_models.c   | 100 ++++++++++++++++++--------------------------
> >>  target/s390x/cpu_models.h   |   1 +
> >>  target/s390x/gen-features.c |  87 ++++++++++++++++++++++++++++++++++++++
> >>  5 files changed, 140 insertions(+), 59 deletions(-)
> > 
> > Unfortunately, this patch makes mingw unhappy (x86_64-w64-mingw32 on my
> > F26 laptop):
> > 
> > In file included from /home/cohuck/git/qemu/target/s390x/cpu_models.h:17:0,
> >                  from /home/cohuck/git/qemu/target/s390x/cpu.h:28,
> >                  from /home/cohuck/git/qemu/hw/s390x/s390-virtio-ccw.c:16:
> > /home/cohuck/git/qemu/hw/s390x/s390-virtio-ccw.c: In function 'ccw_machine_2_12_instance_options':
> > ./gen-features.h:96:35: error: large integer implicitly truncated to unsigned type [-Werror=overflow]
> >  #define S390_FEAT_LIST_QEMU_V2_12 0x3000e918fd6de14fULL,0x000ffffff0000000ULL,0x0000000000000000ULL,0x0000000000000000ULL
> >                                    ^
> > /home/cohuck/git/qemu/hw/s390x/s390-virtio-ccw.c:728:51: note: in expansion of macro 'S390_FEAT_LIST_QEMU_V2_12'
> >      static const S390FeatBitmap qemu_cpu_feat = { S390_FEAT_LIST_QEMU_V2_12 };
> >                                                    ^~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Huh? we have ULL added to all constants, this should not get reported.

Isn't the problem here the S390FeatBitmap type which is a 'unsigned long',
so not guaranteed to be 64-bits on 32-bit hosts ?

Regards,
Daniel
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