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Re: [libvirt] [Qemu-devel] [PATCH qom-cpu 0/9] x86: feature words array (v11) + "feature-words" property

On Thu, May 02, 2013 at 12:53:33AM +0200, Andreas Färber wrote:
> > Eduardo Habkost (9):
> >   target-i386: cleanup: Group together level, xlevel, xlevel2 fields
> >   target-i386/kvm.c: Code formatting changes
> >   target-i386/cpu.c: Break lines so they don't get too long
> >   target-i386: Replace cpuid_*features fields with a feature word array
> Thanks, applied these to qom-cpu:
> https://github.com/afaerber/qemu-cpu/commits/qom-cpu
> These had been around for quite some time and I have reviewed the first
> three line by line; for the fourth I have looked at the script sources
> and trust Igor's review. Thanks for repeatedly rebasing this, Eduardo!


> >   target-i386: Add ECX information to FeatureWordInfo
> This one is lacking Reviewed-by / Acked-by ...
> >   target-i386: Add "feature-words" property
> >   target-i386: Use FeatureWord loop on filter_features_for_kvm()
> ... and this one seems to depend on it.
> >   target-i386: Introduce X86CPU.filtered_features field
> >   target-i386: Add "filtered-features" property to X86CPU
> As mentioned earlier I'd prefer to defer the property design rather than
> putting it lightly reviewed into 1.5 and living with some ABI.
> If libvirt urgently needs this info, this series needs to be reviewed
> and sorted out until the weekend (Hard Freeze on Monday).

I consider it an important bugfix for the QEMU+libvirt stack. The
current libvirt behavior (checking CPUID directly; not using the
"enforce" flag; and having its own copy of each CPU model definition) is
unsafe and may break live-migration silently under many circumstances.


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