Re: [PATCH] cpu_map: Add -noMPX models for x86 Icelake Server

Hello, On Thu, 2022-12-08 at 11:16 +0100, Kashyap Chamarthy wrote: > On Wed, Dec 07, 2022 at 10:23:17AM -0700, Lena Voytek wrote: > > Hello all, > > > > Over the past few months there have been a few more reports of > > users unable > > to use Openstack Nova on their Icelake CPU. Updating virsh > > capabilities to > > properly display that mpx is unavailable fixes it. Is there an > > ideal way to > > update this change such that it gets accepted into libvirt? > > I'm just curious if you tried deploying instances by explicitly > disbaling the "mpx" flag on the compute nodes: > >     [libvirt] >     cpu_mode = custom >     cpu_models = Icelake-Server >     cpu_model_extra_flags = -mpx > Unfortunately this does not work for Openstack Nova users because virsh detects the processor as Broadwell-noTSX-IBRS rather than Icelake- Server. It depends on virsh to provide the correct processor information to assert that the guest is compatible with the host - https://github.com/openstack/nova/blob/8a476061c5e034016668cd9e5a20c4430e...