Re: [libvirt-users] LibVirt query CPU Model support and restore operation

hi, yes we are talking about same host here. You could've just used -cpu host-model-only >> I dont want to host model ( it is working with host model) . AS KVM seems to allow support Haswell with native commands . Does this mean in my case KVM is allowing software emulated cpu model.

Can libvirt allow software-emulated for non host model ? if yes how .

thanks On Tue, Jan 24, 2017 at 1:32 PM, Martin Kletzander <mkletzan(a)redhat.com&gt; wrote: > On Tue, Jan 24, 2017 at 10:08:12AM +0530, akhilesh rawat wrote: > >> Hello , >> >> It was working good working with kvm management tools using libvirt . >> virsh/virt-manager . >> >> But then i got annoyed when management tool did not allow me to change the >> CPU model while creating new virtual machine . >> error >> >> > Are we talking about the same host? > > root@kvm-server qemu]# virt-install --virt-type kvm --name compute-2 --cpu >> Haswell-noTSX --ram=61440 --vcpus=20 --os-type=linux --os-variant=generic >> --disk >> compute2-disk0.qcow2,device=disk,bus=ide,size=300,sparse=tru >> e,format=qcow2 >> --pxe --network bridge=virbr0,model=e1000 --network >> bridge=virbr0,model=e1000 --network bridge=virbr0,model=virtio --network >> bridge=virbr0,model=virtio --graphics vnc,port=5906 --noautoconsole >> >> Starting install... >> ERROR unsupported configuration: guest and host CPU are not compatible: >> Host CPU does not provide required features: invpcid, erms, bmi2, smep, >> avx2, bmi1, fsgsbase, movbe, fma >> Domain installation does not appear to have been successful. >> >> I could not resolve this error . >> >> > You could've just used -cpu host-model-only. > > Finally i came across the post which say that libvirt cross verifies flags >> under CPU model present in >> /usr/share/libvirt/cpu_map.xml and cat /proc/cpuinfo . >> >> An yes the flag complained were not present in host proc/cpuinfo. >> >> Question 1: Is it really needed for Libvirt to do this check . >> >> > It is, otherwise users might not get what they asked for. Or it might > be software-emulated. > > AS KVM seems to allow support Haswell with native commands . Why libvirt is >> doing this check then ? >> >> As i was not sure where the problem lies and i was using libvirt 2.0.0 >> version i upgraded to 2.5.0 by compiling form source . >> But then i faces issue using virsh/virt-manager as seem it was not >> compatilble with upgarded version of libvirt. >> >> Now my system is little messed around libvirt . I did reinstall/reboot >> Quite many things not working . >> >> Question 2 : How can i restore original Libvirt 2.0.0 . >> >> > Depends on your distro. You can just uninstall and install the older > version if your package managed doesn't support downgrading. But try to > keep on the newer one and fix your workflow. > > >> br aki >> > > _______________________________________________ >> libvirt-users mailing list >> libvirt-users(a)redhat.com >> https://www.redhat.com/mailman/listinfo/libvirt-users >> >