Re: [libvirt] [PATCH] qemu: Starting a domain with custom model and allowed-fallback failed when host lacks some CPU features

On Tue, Jun 06, 2017 at 12:23:01 -0400, Yi Wang wrote:

An attemp to start a domain requesting a custom CPU model, core2duo, for example, will fail if some feature that the model needs doesn't exist in that host, even though fallback attibute is set allow: "error: the CPU is incompatible with host CPU: Host CPU does not provide required features: monitor" Of course we can start that domain through forbidding that feature, but that may not be flexible.

NACK, it works exactly as designed. The fallback attribute would make a difference only if core2duo CPU model was not supported by QEMU, then libvirt would translate it into a different supported one. Jirka