Re: [libvirt] [PATCH] Drop hle feature for Haswell CPUs

On Tue, Dec 16, 2014 at 01:33:15PM +0100, Guido Günther wrote: > The intel-microcode 3.20140913.1 update disables TSX-NI (transactional > memory instructions). When a server running libvirt is rebooted with > this update, libvirt no longer considers the machine to have a Haswell > CPU: > > # virsh capabilities | grep -A1 '<arch>x86_64' > <arch>x86_64</arch> > <model>SandyBridge</model> > > Since Intel disables the feature on their CPUs we shouldn't check for it > as well to keep VMs using Haswell working. > > This was debugged and reported by Chris Boot at > http://bugs.debian.org/773189 > --- > src/cpu/cpu_map.xml | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/src/cpu/cpu_map.xml b/src/cpu/cpu_map.xml > index bd9b056..f41dbce 100644 > --- a/src/cpu/cpu_map.xml > +++ b/src/cpu/cpu_map.xml > @@ -507,7 +507,6 @@ > <feature name='movbe'/> > <feature name='fsgsbase'/> > <feature name='bmi1'/> > - <feature name='hle'/> > <feature name='avx2'/> > <feature name='smep'/> > <feature name='bmi2'/> NACK. We can not change existing models in cpu_map.xml because that results in a guest ABI change.