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Date: Tue, 23 Jun 2015 23:34:45 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model +
 script to dump existing CPU models
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To: Eduardo Habkost <ehabkost@redhat.com>
Cc: mimu@linux.vnet.ibm.com, qemu-devel@nongnu.org, Alexander Graf <agraf@suse.de>, borntraeger@de.ibm.com, Igor Mammedov <imammedo@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Jiri Denemark <jdenemar@redhat.com>, Andreas =?iso-8859-1?Q?F=E4rber?= <afaerber@suse.de>, rth@twiddle.net

On Tue, Jun 23, 2015 at 02:11:22PM -0300, Eduardo Habkost wrote:
> Even if it is a bug fix. If it is a change that can make the VM
> unrunnable, it needs to be controlled by a separate flag, not by the
> machine-type.

I agree - command line compatibility is important.  But we are supposed
to provide that.  I am surprised that libvirt suddenly wants to avoid
some command line flags because they are not stable. IMHO we did something
wrong here if so. Maybe there was a valid reason for it. But then won't
it apply to libvirt as well?

Now, if people want to update CPU models outside the QEMU binary,
that might be doable simply by moving them to a separate package,
with a text file that QEMU reads at startup.


> -- 
> Eduardo