[libvirt-users] libvirt does not show same CPU Model as /proc/cpuinfo for CPU Model info.

[akhilesh rawat]

Hi ,

Created new thread .


Environment:
Bare Metal server + CentOs with qemu/KVM +libvirt for virtualization
Guest Instantiated with virt-install with forced CPU model like below
 virt-install --virt-type kvm --name compute-0 --cpu
Haswell,+fma,+movbe,+fsgsbase,+bmi1,+hle,+avx2,+smep,+bmi2,+erms,+invpcid,+rtm
--ram=61440 --vcpus=20 --os-type=linux --os-variant=generic

After guest installation  /proc/cpuinfo show model name as Haswell .
However Libvirt virsh capabilities show CPU configuration as "SandyBridge .
"

1. Could I get explanation of the why inconsistency .

2. Is this expected behaviour

3. Why libvirt does not show same CPU Model as /proc/cpuinfo for CPU Model
info.

My Aim : Nested Virtualization and Nested Guest needs CPU model as Haswell
strictly .

4. IS it possible alternative to succeed in my aim ?

Thanks a lot for support. !



Guest CPU config:
processor    : 19
vendor_id    : GenuineIntel
cpu family    : 6
model        : 60
model name    : Intel Core Processor (Haswell)
stepping    : 1
microcode    : 0x1
cpu MHz        : 1995.144
cache size    : 4096 KB
fpu        : yes
fpu_exception    : yes
cpuid level    : 13
wp        : yes
flags        : fpu de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 syscall nx rdtscp lm constant_tsc
rep_good nopl eagerfpu pni pclmulqdq ssse3 cx16 pcid sse4_1 sse4_2 x2apic
popcnt tsc_deadline_timer aes xsave avx hypervisor lahf_lm xsaveopt
bogomips    : 4105.33
clflush size    : 64
cache_alignment    : 64
address sizes    : 46 bits physical, 48 bits virtual
power management:

<capabilities>

  <host>
    <uuid>95c4e625-3383-4ec1-9ee4-c47a87d93b97</uuid>
    <cpu>
      <arch>x86_64</arch>
      <model>SandyBridge</model>
      <vendor>Intel</vendor>
      <topology sockets='20' cores='1' threads='1'/>
      <feature name='hypervisor'/>
      <feature name='osxsave'/>
      <feature name='pcid'/>
      <pages unit='KiB' size='4'/>
      <pages unit='KiB' size='2048'/>




Host CPU config:
processor    : 23
vendor_id    : GenuineIntel
cpu family    : 6
model        : 45
model name    : Intel(R) Xeon(R) CPU E5-2620 0 @ 2.00GHz
stepping    : 7
microcode    : 0x710
cpu MHz        : 1200.000
cache size    : 15360 KB
physical id    : 1
siblings    : 12
core id        : 5
cpu cores    : 6
apicid        : 43
initial apicid    : 43
fpu        : yes
fpu_exception    : yes
cpuid level    : 13
wp        : yes
flags        : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx
pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl
xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor
ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid dca sse4_1 sse4_2 x2apic
popcnt tsc_deadline_timer aes xsave avx lahf_lm ida arat epb pln pts dtherm
tpr_shadow vnmi flexpriority ept vpid xsaveopt
bogomips    : 4004.01
clflush size    : 64
cache_alignment    : 64
address sizes    : 46 bits physical, 48 bits virtual
power management:





Br Aki
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