Comment 30 for bug 1618473

Ok it won't work this way apparently.

The proposal is to:
1. revert this fix as it makes matters worse for some customers
2. send out a workaround for affected customers, which is to:
--1. check current model which libvirt chooses by doing "ps -ef | grep qemu" on any problematic compute, and look for --cpu directive, should look like "-cpu Westmere,+invpcid,+erms,+bmi2,+smep..."
--2. edit /usr/share/libvirt/cpu_map.xml on computes - add a new SOMEMODELNAME model, inside add the base model, (Westmere in this example) and also add "<feature policy='disable' name='avx2'/>" in there, also add all features listed by qemu like so: "<feature name='invpcid'>" and so on
--3. edit nova.conf on computes:
----1. cpu_mode=custom
----2. cpu_model=SOMEMODELNAME
--4. restart nova-compute on computes