[OE-core] [PATCH] tune-core2: use n270 instead of core2duo

[Martin Jansa]

Is this different issue than what was discussed in:
https://www.mail-archive.com/openembedded-core@lists.openembedded.org/msg109516.html

The message is slightly different (might be changed in newer qemu used
now), but the issue I had before was that features of selected -cpu and
host cpu didn't match and qemu failed with:
qemu-system-x86_64: warning: host doesn't support requested feature:
CPUID.01H:EDX.ss [bit 27]
when some features were missing and kvm was used.

If it's the same root cause, then it's not a bug in qemu.

On Thu, Sep 13, 2018 at 11:33 PM Andre McCurdy <armccurdy at gmail.com> wrote:

> On Thu, Sep 13, 2018 at 12:25 AM, Anuj Mittal <anuj.mittal at intel.com>
> wrote:
> > Fixes warnings in builds using core2-32 tune:
> >
> > warning: TCG doesn't support requested feature:
> CPUID.80000001H:EDX.syscall [bit 11]
> > warning: TCG doesn't support requested feature: CPUID.80000001H:EDX.lm
> [bit 29]
> >
> > when executing postinsts using qemu-i386.
> >
> > i386 target doesn't enable CPUID_EXT2_SYSCALL and CPUID_EXT2_LM [1]
> > while cpu choice of core2duo that we use for core2-32 TUNE does [2].
> > Use n270 cpu instead to use with qemu which supports SSSE3 and doesn't
> > have these bits enabled [3].
> >
> > [1] https://github.com/qemu/qemu/blob/master/target/i386/cpu.c#L739
> > [2] https://github.com/qemu/qemu/blob/master/target/i386/cpu.c#L1439
> > [3] https://github.com/qemu/qemu/blob/master/target/i386/cpu.c#L1603
> >
> > Fixes [YOCTO #12916]
>
> Is this working around a bug in qemu?
>
> > Signed-off-by: Anuj Mittal <anuj.mittal at intel.com>> ---
> >  meta/conf/machine/include/tune-core2.inc | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/meta/conf/machine/include/tune-core2.inc
> b/meta/conf/machine/include/tune-core2.inc
> > index c686bb4682..ddde719bde 100644
> > --- a/meta/conf/machine/include/tune-core2.inc
> > +++ b/meta/conf/machine/include/tune-core2.inc
> > @@ -21,7 +21,7 @@ TUNE_FEATURES_tune-core2-32 =
> "${TUNE_FEATURES_tune-x86} core2"
> >  BASE_LIB_tune-core2-32 = "lib"
> >  TUNE_PKGARCH_tune-core2-32 = "core2-32"
> >  PACKAGE_EXTRA_ARCHS_tune-core2-32 = "${PACKAGE_EXTRA_ARCHS_tune-i686}
> core2-32"
> > -QEMU_EXTRAOPTIONS_core2-32 = " -cpu core2duo"
> > +QEMU_EXTRAOPTIONS_core2-32 = " -cpu n270"
> >
> >  AVAILTUNES += "core2-64"
> >  TUNE_FEATURES_tune-core2-64 = "${TUNE_FEATURES_tune-x86-64} core2"
> > --
> > 2.17.1
> >
> > --
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> > Openembedded-core at lists.openembedded.org
> > http://lists.openembedded.org/mailman/listinfo/openembedded-core
> --
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