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

[Martin Kletzander]

On Sat, Jan 28, 2017 at 09:29:11PM +0530, akhilesh rawat wrote:
>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 .
>"
>

You are running the 'virsh capablities' in the guest as well, right?

Make sure you have same versions of libvirt in the guest and the host
so that they have the same CPU specifications

>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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