"Daniel P. Berrange" <berra...@redhat.com> writes: > On Mon, Oct 01, 2012 at 06:43:00PM +0200, Andreas Färber wrote: >> Hello Jan, >> >> Am 01.10.2012 16:34, schrieb Jan Kiszka: >> > If we built a target for a host that supports KVM in principle, set the >> > default accelerator to KVM as well. This also means the start of QEMU >> > will fail to start if KVM support turns out to be unavailable at >> > runtime. >> >> From a distro point of view this of course means that we will build >> against KVM and that the new KVM default will start to fail for users on >> very old hardware. Can't we do a runtime check to select the default? > > NB, this is *not* only about old hardware. There are plenty of users who > use QEMU inside VMs. One very common usage I know of is image building > tools which are run inside Amazon VMs, using libguestfs & QEMU.
But libguest can set it's accelerator option to whatever it wants. If your running QEMU under a VM, it's pretty reasonable to have to use a special option IMHO. > IMHO, default to KVM, fallback to TCG is the most friendly default > behaviour. Except if a user expects good network performance and can't understand why they're getting 100kb/s. Regards, Anthony Liguori > > Daniel > -- > |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| > |: http://libvirt.org -o- http://virt-manager.org :| > |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| > |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
