Oh, I also see that my claws-mail filters are in chaos and that there's additional email to this mail-thread. On Thu, 21 May 2020 16:14:34 +0100 Stefan Hajnoczi <stefanha@xxxxxxxxxx> wrote: > On Wed, May 20, 2020 at 07:23:32PM +0200, Paolo Bonzini wrote: > > 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? > > KVM_HINTS_DEDICATED (now known as KVM_HINTS_REALTIME) is also used by > cpuidle-haltpoll. In that case we don't care about mwait. > > CPU passthrough can prevent live migration, so I think we should relax > this check, if possible. I agree, the check for <cpu mode='host-passthrough'/> should be relaxed. > Wim: Can you let us know what the original intention of checking for > cpu-passthrough was? >From our, my proposed, point of view it was. But that seems silly indeed. Rgds, - Wim10H. > Thanks, > Stefan
