On Wed, 17 Jan 2018 17:04:31 +0100
David Hildenbrand <da...@redhat.com> wrote:
> On 17.01.2018 16:43, Igor Mammedov wrote:
> > it will be used for for 2 purposes, 1st is to
> > provide to cpu name resolving class for machine 'none'
> > cpu_parse_cpu_model(machine_class->default_cpu_type, cpu_model)
> > and later to drop a bunch of ifdefs *-user/main.c that
> > set default cpu_model.
> >
> > Use default value from linux-user for TARGET_DEFAULT_CPU_TYPE.
> >
> > Signed-off-by: Igor Mammedov <imamm...@redhat.com>
> > ---
> > CC: Richard Henderson <r...@twiddle.net>
> > CC: Alexander Graf <ag...@suse.de>
> > CC: qemu-s3...@nongnu.org
> > ---
> > target/s390x/cpu.h | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
> > index 1a8b6b9..174624a 100644
> > --- a/target/s390x/cpu.h
> > +++ b/target/s390x/cpu.h
> > @@ -731,6 +731,7 @@ void s390_set_qemu_cpu_model(uint16_t type, uint8_t
> > gen, uint8_t ec_ga,
> >
> > #define S390_CPU_TYPE_SUFFIX "-" TYPE_S390_CPU
> > #define S390_CPU_TYPE_NAME(name) (name S390_CPU_TYPE_SUFFIX)
> > +#define TARGET_DEFAULT_CPU_TYPE S390_CPU_TYPE_NAME("qemu")
> >
> > /* you can call this signal handler from your SIGBUS and SIGSEGV
> > signal handlers to inform the virtual CPU of exceptions. non zero
> >
>
> At least from a !KVM perspective this is correct. And that is at least
> relevant for linux-user. I doubt that this is relevant for KVM. The
> "none" machine cannot be used either way and CPU models are sensed via qmp.
If you look at cpu_parse_cpu_model() impl., you'll see that
TARGET_DEFAULT_CPU_TYPE isn't used as actual CPU type but as a proxy
to get access to CPUClass::class_by_name() callback which is
implemented by every target. So accelerator doesn't have any effect
here.
> Reviewed-by: David Hildenbrand <da...@redhat.com>
Thanks!
