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Date: Fri, 14 Dec 2012 02:54:40 -0500 (EST)
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] define qemukvm-1.2 machine type
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To: Eduardo Habkost <ehabkost@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, Marcelo Tosatti <mtosatti@redhat.com>, qemu-devel@nongnu.org, Cole Robinson <crobinso@redhat.com>

> > > > I think distros that used to ship qemu-kvm should just change
> > > > the default just like for the acpi_piix4.c change.
> > >
> > > Maybe we could provide a --with-qemu-kvm-compat configure flag to
> > > them?

I like this.

> > I think that defeats the purpose of a single binary.
> > 
> > I think it would be better for the distros to have a qemu-kvm
> > script that was:
> > 
> > /usr/libexec/qemu-kvm:
> > 
> > #!/bin/sh
> > 
> > qemu-system-x86_64 -enable-qemu-kvm-compat "$@"
> 
> That would be even better. I proposed a configure flag because I
> understood (maybe incorrectly) that Paolo proposed a build-time
> default change.

Yes, that's what I was thinking.  The problem is that Fedora did ship a
qemu-system-x86_64 binary that disabled the qemu-kvm options (including
using TCG by default), but it still had a qemu-kvm-compatible migration
format.

Paolo