Re: [libvirt] What is the strategy to update the CPU Models in src/cpu/cpu_map.xml based on?
[Dropping random people from Cc]
On Wed, May 30, 2018 at 18:00:56 +0800, Dou Liyang wrote:
Hi All,
I am not sure about the update strategy of CPU models in libvirt.
IMO, It's depend on the CPU model in qemu-kvm, if some CPU models
were updated in qemu-kvm. Then, we should modify the src/cpu/cpu_map.xml
of libvirt to synchronize?
No, we never change existing CPU models in cpu_map.xml to make sure the
same CPU model is the same across libvirt versions. Not to mention that
QEMU only changes existing CPU models for new machine type (for the same
compatibility reason) so we can't just change our CPU models since we
don't know what machine type their going to be used with. Libvirt will
handle the differences in runtime by remembering any additionally
enabled or disabled features once domain starts to make sure the exact
same CPU is recreated after, e.g., migration.
Jirka