[Pkg-libvirt-maintainers] Bug#731815: virsh: Unable to start any VM with custom cpu model

[Ariel Malves]

Hi,

I faced a similar problem when upgrading libvirt/qemu packages from 
wheezy to wheezy-backports. Try to delete 
/var/cache/libvirt/qemu/capabilities and restart libvirt-bin.

[]'s

Ariel

On 10/27/2014 02:38 PM, Thomas Rechberger wrote:
> Same problem after changing from wheezy to jessie.
>
> virt-install --name test --memory 1024 --nodisk --pxe --cpu host
> ERROR    internal error: Cannot find suitable CPU model for given data
>
> libvirtd log:
> Preferred CPU model Opteron_G3 not allowed by hypervisor; closest 
> supported model will be used
>
> has it anything to do with wrong detected cpu flags? I am using AMD 
> Kabini cpu and Opteron G3 map is used both under wheezy and jessie.
>
> virsh capabilities > /tmp/capabilities.xml
> root at kvm:/# virsh cpu-compare /tmp/capabilities.xml
> CPU described in /tmp/capabilities.xml is identical to host CPU
>
> gir1.2-libvirt-glib-1.0:amd64/jessie 0.1.7-2.1 uptodate
> libvirt-bin:amd64/jessie 1.2.9-3 uptodate
> libvirt-clients:amd64/jessie 1.2.9-3 uptodate
> libvirt-daemon:amd64/jessie 1.2.9-3 uptodate
> libvirt-daemon-system:amd64/jessie 1.2.9-3 uptodate
> libvirt-glib-1.0-0:amd64/jessie 0.1.7-2.1 uptodate
> libvirt0:amd64/jessie 1.2.9-3 uptodate
>
> cat /proc/cpuinfo
> processor : 0
> vendor_id : AuthenticAMD
> cpu family : 22
> model : 0
> model name : AMD Sempron(tm) 3850 APU with Radeon(tm) R3
> stepping : 1
> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
> pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt 
> pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid 
> aperfmperf eagerfpu pni pclmulqdq monitor ssse3 cx16 sse4_1 sse4_2 
> movbe popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic 
> cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt 
> topoext perfctr_nb perfctr_l2 arat xsaveopt hw_pstate proc_feedback 
> npt lbrv svm_lock nrip_save tsc_scale flushbyasid decodeassists 
> pausefilter pfthreshold bmi1
>
> virsh -r capabilities shows me additional invtsc osxsave feature which 
> the older version didnt had.
>
> Here was mentioned a kernel update fixed it:
> https://bbs.archlinux.org/viewtopic.php?id=182142
> What it has to do with kernel version?
>