Re: [Qemu-devel] Re: [PATCH] qemu-kvm: Switch to upstream -enable-kvm semantics

[Anthony Liguori]

On 12/21/2010 10:07 AM, Markus Armbruster wrote:
> "Richard W.M. Jones"<address@hidden>  writes:
>
>    
> > On Tue, Dec 21, 2010 at 04:41:03PM +0100, Markus Armbruster wrote:
> >      
> > > Like this?
> > >
> > > upstream qemu   |  default  |-enable-kvm
> > > ----------------+-----------+-----------
> > > KVM available   | disabled  |  enabled
> > > KVM unavailable | disabled  |    fail
> > >
> > > qemu-kvm        |  default  |-enable-kvm|  -no-kvm
> > > ----------------+-----------+-----------+-----------
> > > KVM available   |  enabled* |  enabled  |  disabled
> > > KVM unavailable | disabled  |    fail   |  disabled
> > >
> > > * differs from upstream
> > >        
> > libguestfs wants "best effort" behaviour, and libvirt wants "KVM or die"
> > behaviour.
> >      
> For what it's worth, default gives you exactly that with qemu-kvm.
> Maybe that's good enough, on the theory that if you have KVM, you most
> likely have libguestfs using qemu-kvm.
>
>    
> > Avi, can you comment on whether just opening /dev/kvm O_RDWR is a
> > reasonable way to detect if KVM is available?
> >
> > Markus, any idea when we might get the -accel option appearing in
> > released versions of qemu/KVM?
> >      
> No idea.  Anthony?
>    

I see no problem with 0.15 if someone cooks up a patch.

Regards,

Anthony Liguori