On Tue, 26 Jun 2018 06:40:56 +0200 Thomas Huth <th...@redhat.com> wrote:
> On 25.06.2018 20:26, Paolo Bonzini wrote: > > On 25/06/2018 19:30, Eduardo Habkost wrote: > >>>> Attentive distros could even replace the wrapper script by a link. > >>> If they are okay with replacing the "KVM only" semantics with "KVM or > >>> TCG", which I think is generally worse. > >> > >> If we can't get agreement on what's the right default for each > >> QEMU binary, I think that's yet another reason to document that > >> upstream QEMU won't guarantee ABI compatibility if -accel is > >> omitted. > > > > Before that we should ask what the benefit is in changing the default > > for qemu-system-*. Nobody is using it in practice to start QEMU with > > KVM enabled... > > That's certainly not true. I've seen a couple of times already that > people ask on IRC why their guests are running so slow, and if you ask > them about their command line, it's obvious that they simply were not > aware of "-accel" / "-enable-kvm" yet. > > <semi-sarcastic> > Maybe we simply should add a "--verbose" command line option that people > can use to diagnose their problems: > > $ qemu-system-x86_64 --verbose > QEMU emulator version 2.12.50 > Using 'tcg' accelerator. Use '-accel kvm' to speed things up. > Machine type is 'pc-i440fx-3.0'. Use 'q35' for a more modern machine. > .... > </semi-sarcastic> Not sure how serious you meant that, but I actually quite like the idea :)
