Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models

[Andreas Färber]

Am 23.06.2015 um 19:45 schrieb Eduardo Habkost:
> On Tue, Jun 23, 2015 at 07:41:50PM +0200, Andreas Färber wrote:
> [...]
>> If that is the whole problem here, then why not just add a global flag
>> to only enable explicitly requested KVM features? All other features
>> should not depend on the host, and the whole discussion about -x.y seems
>> like a distraction.
> 
> Now replace "KVM features" with "CPU fatures", because all CPU features
> are KVM features, as all of them depend on KVM code enabling them on
> GET_SUPPORTED_CPUID.
> 
> Thus, the global flag to only enable explicitly request KVM features on
> CPUs is "-cpu custom", which doesn't enable any CPU feature at all.

If libvirt wants to use an empty CPU model, then why export our models
to libvirt?

I don't mind there being an optional custom model, I mind our
compat_props getting ignored that way, which are unrelated to adding new
features, in fact they suppress just that for the -2.3 examples.

Andreas

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