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.

IMHO, default to KVM, fallback to TCG is the most friendly default
behaviour.

Daniel
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