Re: kvm-hint-dedicated requires host CPU passthrough?

On 20/05/20 19:13, Stefan Hajnoczi wrote:

Hi, libvirt refuses to set KVM_HINTS_DEDICATED when the CPU model is not host-passthrough.

Is there a reason for this limitation?

My understanding is that KVM_HINTS_DEDICATED means the vCPU is pinned to a host CPU that is not shared with other tasks. Any KVM vCPU should be able to support this feature, regardless of whether host-passthrough is used or not.

Perhaps it's because KVM_HINTS_DEDICATED enables mwait passthrough, and the details of mwait vary per CPU model? Paolo