Re: [libvirt] [virt-tools-list] exposing host-passthrough in virt-manager ui? (was: Re: small suggestion)

On 2/6/19 10:57 AM, Pavel Hrdina wrote: > On Wed, Feb 06, 2019 at 10:20:38AM -0500, Cole Robinson wrote: > > On 2/5/19 6:19 PM, Hetz Ben Hamo wrote: > > > Is it possible to add in the virt-manager the "host-passthrough" to the > > > CPU models please? > > > > > > > You can type 'host-passthrough' into the field and it will work. The reason > > we don't advertise it is because it's considered to have some mild > > supportability issues with libvirt. For the vast majority of use cases > > though it's completely fine > > Maybe we can reconsider this decision, the only thing that would not > work is live migration to destination with different CPU and we can > have a warning/info about it in the UI. > > Possibly we could allow to set 'host-passthrough' as the default guest > CPU in virt-manager config. > Nowadays with host-model being much smarter, is there much functional difference between host-model and host-passthrough? I don't really know the answer. > Most workstation/desktop users of virt-manager probably doesn't care > about live migration and it would copy the host CPU as closely as > possible. Since we allow to manually type in 'host-passthrough' I > personally don't see any reason why it cannot be selectable. > The problem I see is that host-passthrough sets the libvirt 'taint' flag on the VM. While it doesn't have any real impact on end users generally I took that to mean 'you are doing something that is unsupported'.