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Re: [Qemu-devel] X86CPU "feature-words" property on QEMU (was Re: [PATCH

From: Paolo Bonzini
Subject: Re: [Qemu-devel] X86CPU "feature-words" property on QEMU (was Re: [PATCH v3 1/3] x86: Data structure changes to support MSR based) features
Date: Fri, 17 Aug 2018 19:59:40 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

On 17/08/2018 19:48, Eduardo Habkost wrote:
> So let's do what's necessary to remove it.  But I don't think the
> removal of "feature-words" should block the inclusion of this
> series.
> Now, should QOM properties follow our feature deprecation policy,
> or they were never a supported external API and we can remove it
> immediately?
> CCing Jiri and libvir-list, because I just found that there's
> code on libvirt that uses it, but I don't know exactly it does
> with that info.

It is used to check whether the host supports invtsc and pv-unhalt and
avoid changing the guest ABI when migrating: see
https://marc.info/?l=libvir-list&m=152445761414746&w=2 for a patch that
introduces one user.

I think we should extend it to MSRs, not remove it.


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