On Tue, Jun 26, 2018 at 09:50:04AM +0200, Cornelia Huck wrote: > 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 :)
Also, this mode could be enabled by default if stderr is a tty. -- Eduardo
