Re: [Qemu-devel] [PATCH v2] accel: forbid early use of kvm_enabled() and friends

[Eduardo Habkost <ehabkost@redhat.com>]

On Fri, Jun 29, 2018 at 01:47:59PM +0200, Paolo Bonzini wrote:
> On 29/06/2018 13:42, Cédric Le Goater wrote:
> >> Yeah, doing anything non-trivial in class_init is just asking for trouble,
> >> as conceivably nothing is initialized at that point. 
> >
> > May be we should consider having a set of binaries for each accelerator,
> > KVM, TCG, etc. That would simplify a lot of the init path of the machines
> > and also of some of the models which are trying to initialize in one mode 
> > or the other.
> 
> That would prevent things like "-machine accel=kvm:tcg", which try KVM
> and fall back to TCG if it is not available.

We could at least make it easier for packagers to choose the
features available on the binaries they build (including
accelerators, machine-types and device models).

As we already have distributions that build a "qemu-kvm" binary
that uses KVM by default, we could make this a supported feature
of the build system instead of requiring downstream
makefile/configure hacks.

-- 
Eduardo