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+-cpu ...,+topoext works only with EPYC CPU model
+
+See bug report at:
+https://bugzilla.redhat.com/show_bug.cgi?id=1615682
+
+Probably this is caused by the inconsistent legacy cache information on all CPU models except EPYC.
+
+---------------------------------------------
+Description of problem:
+Guest should get 2 threads per core and all of them should be on-line when booting guest with old amd cpu model + smt
+
+Steps to Reproduce:
+1.Boot rhel7.6 guest with cli:
+/usr/libexec/qemu-kvm -name rhel7.6 -m 16G -machine pc,accel=kvm \
+        -S \
+        -cpu Opteron_G3,+topoext,xlevel=0x8000001e,enforce \
+        -smp 2,threads=2 \
+        -monitor stdio \
+        -qmp unix:/tmp/qmp2,server,nowait \
+        -device VGA \
+        -vnc :0 \
+        -serial unix:/tmp/console2,server,nowait \
+        -uuid 115e11b2-a869-41b5-91cd-6a32a907be7f \
+        -drive file=rhel7.6-20180812.qcow2,if=none,id=drive-scsi-disk0,format=qcow2,cache=none,werror=stop,rerror=stop -device ide-hd,drive=drive-scsi-disk0,id=scsi-disk0 \
+        -netdev tap,id=idinWyYY,vhost=on -device virtio-net-pci,mac=2e:39:fa:ff:88:a1,id=idlbq7eA,netdev=idinWyYY \
+
+2.check cpu info inside guest
+3.
+
+Actual results:
+Guest gets one online cpu, one offline cpu and one thread per core:
+# lscpu
+lscpu
+Architecture:          x86_64
+CPU op-mode(s):        32-bit, 64-bit
+Byte Order:            Little Endian
+CPU(s):                2
+On-line CPU(s) list:   0
+Off-line CPU(s) list:  1
+Thread(s) per core:    1
+Core(s) per socket:    1
+Socket(s):             1
+NUMA node(s):          1
+Vendor ID:             AuthenticAMD
+CPU family:            16
+Model:                 2
+Model name:            AMD Opteron 23xx (Gen 3 Class Opteron)
+Stepping:              3
+CPU MHz:               2096.060
+BogoMIPS:              4192.12
+Hypervisor vendor:     KVM
+Virtualization type:   full
+L1d cache:             64K
+L1i cache:             64K
+L2 cache:              512K
+L3 cache:              16384K
+NUMA node0 CPU(s):     0
+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 lm art rep_good nopl extd_apicid pni cx16 x2apic popcnt hypervisor lahf_lm cmp_legacy abm sse4a misalignsse topoext retpoline_amd ibp_disable vmmcall
+
+
+Expected results:
+Guest should get 2 threads per core and all of them should be on-line
+
+---------------------------------------------
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