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

[Thomas Rechberger]

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?