Hi,
Has anyone here managed to get cpu masking working via libvirt?
Intention to enable VM migrations between hosts of a different CPU
generation.
Inside my xml I'm providing the model as well as a list of features to
specifically disable, but none of it seems to take any effect. On
booting the VM I still see the disabled flags in /proc/cpuinfo
<cpu match='exact' mode='custom'>
<arch>x86_64</arch>
<model fallback='forbid'>Westmere</model>
<feature policy='disable' name='dtherm'/>
<feature policy='disable' name='erms'/>
<feature policy='disable' name='fsgsbase'/>
<feature policy='disable' name='pts'/>
<feature policy='disable' name='pln'/>
<feature policy='disable' name='rdrand'/>
<feature policy='disable' name='f16c'/>
<feature policy='disable' name='aes'/>
<feature policy='disable' name='tsc_deadline_timer'/>
<feature policy='disable' name='x2apic'/>
<feature policy='disable' name='dtherm'/>
<feature policy='disable' name='pclmulqdq'/>
</cpu>
Doing a dumpxml against the domU once it's booted leaves out the entire
<cpu> section, leading me to think maybe libvirt is dropping it for some
reason. I've got the above <cpu> just in the main <domain> section.
Anyone have this working or able to offer some suggestions?
Thanks!
- Nathan
