On Mon, Nov 16, 2015 at 10:44:59AM +0100, Paolo Bonzini wrote: > > > On 13/11/2015 20:07, Eduardo Habkost wrote: > > KVM can't virtualize rdtscp on AMD CPUs yet, so there's no point > > in enabling it by default on AMD CPU models, as all we are > > getting are confused users because of the "host doesn't support > > requested feature" warnings. > > > > Disable rdtscp on Opteron_G* models, but keep compatibility on > > pc-*-2.4 and older (just in case there are people are doing funny > > stuff using AMD CPU models on Intel hosts). > > > > Signed-off-by: Eduardo Habkost <ehabkost@xxxxxxxxxx> > > Can we do it only on KVM and not on TCG? We can, but I would like to avoid it, if possible. It would require more complex compat code (the "Add optional class name to kvm_default_props¨ patch I sent some time ago), and people who need rdtscp will be able to use Opteron_G*-rdtscp soon. -- Eduardo -- libvir-list mailing list libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list