On 03/11/2015 23:54, Eduardo Habkost wrote: > Probably, yes. libvirt even has these commented out in their cpu_map.xml: > > <model name='qemu64'> > <model name='kvm64'/> > <!-- These are supported only by TCG. KVM supports them only if the > host does. So we leave them out: > > <feature name='popcnt'/> > <feature name='lahf_lm'/> > <feature name='sse4a'/> > <feature name='abm'/> > --> > <feature name='svm'/> > </model> > > (libvirt must stop making assumptions about the CPU model feature sets so > all <feature> elements in cpu_map.xml should go away. But at least the > current cpu_map.xml is a good reference to what it expects today.)
FWIW, lahf_lm is present on virtually all 64-bit machines and is rare enough that KVM could just emulate it, so we shouldn't remove it. But removing popcnt is a good suggestion to take from libvirt. It can be done on top of this series. We should get all of this into the first -rc, anyway. Paolo
