On Tue, Jan 24, 2017 at 04:21:14PM +0530, akhilesh rawat wrote:
hi, yes we are talking about same host here. You could've just used -cpu host-model-onlyI 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.
I don't remember if it gets emulated or just dropped. Do you remember if you saw those in /proc/cpuinfo in the guest? Maybe QEMU just dropped them on startup. I believe that was why we added the code that checks for it.
Can libvirt allow software-emulated for non host model ? if yes how .
You can force each feature, that way it could work, but I'm not sure with all the refactoring that was there.
thanks On Tue, Jan 24, 2017 at 1:32 PM, Martin Kletzander <mkletzan@xxxxxxxxxx> 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 . errorAre we talking about the same host? root@kvm-server qemu]# virt-install --virt-type kvm --name compute-2 --cpuHaswell-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 flagsunder 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 isdoing 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@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
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